HK1145133A - Portable brewing device and method of making and operating - Google Patents

Description

Portable brewing device and method of making and operating same

Technical Field

The present invention relates to a convenient device for making or brewing hot beverages such as espresso (espresso) coffee typically used in various coffee-based beverages.

Background

There are many coffee makers and brewing devices in the art and such devices have been used for a long time in coffee shops, cafes and other stores. In particular, espresso brewing devices share unique distinctions in that espresso enthusiasts can enjoy a unique coffee beverage through a unique brewing process that produces a palatable product with a foam (crema) top layer.

Good espresso can be sweet without sugar, drunk without blanching, and left with long aftertaste for several hours. Espresso coffee, which is capable of achieving all these qualities, is made by rapidly and thoroughly extracting many of the aromas from ground coffee at high operating pressures, without the time to develop a burnt or bitter taste. This results in the extraction of essential oils from the ground coffee beans, resulting in a strong aroma, aroma and color of the foam. These same qualities also apply to the brewing liquid that forms most synthetic coffees. The release of carbon dioxide remaining in the coffee powder creates a finely foamed foam that covers the color and continues to spread the aroma for a long period of time after the coffee is consumed.

The technological and material requirements for producing good espresso coffee and its accompanying foam are well known to those skilled in the art. They include high pressures of approximately 130psi-145psi (9-10 bar), however this is marked, for example, by Nespresso^TMBranded machines may be changed to 240psi (19 bar) high. The water temperature should typically be 197 ° F-205 ° F (92-96 ℃) and the coffee beans should be freshly roasted and ground as close to the brewing time as possible. The extraction of espresso coffee by passing hot water through the coffee powder should not take more than 25-30 seconds. Failure to meet either of these requirements will result in coffee lacking mouthfeel, being too bitter to taste, or lacking sufficient foam, in part or in whole. The water temperature can be controlled. Since the hot water normally prepared is very close to the water at sea levelWhich can be used to deliver the steady pressure required to produce good espresso. Moreover, despite the various espresso designs proposed or created, there remains a need for an effective portable espresso maker.

The first espresso machine relies on the pressure generated at the bottom of a high hot water column. The steam pressure is used to force the water up the raised piping system where it will be forced down through the espresso grinds and into the cup. This is an impractical design and expensive due to its size and complex piping.

Espresso pots are almost always used today in order to easily control the pressure generated in the espresso machine, to conveniently supply water at the correct temperature, and to provide a more practical size of the entire package. This design, although with many variants, usually comprises a boiler capable of containing a sufficient amount of water for making several cups of espresso coffee, a water heating unit, a water pump and a "portfilter group" containing coffee powder. The design may also contain a steam wand for heating and frothing milk, and in more expensive machines, a separate kettle dedicated to generating steam for the steam wand.

The electricity is used to heat the internal water boiler, the optional auxiliary steam boiler and the high pressure water pump. The water pump forces the water coming from the boiler through the fine coffee powder, which is compressed ("tamped") into a mouth filter basket (a removable container containing the coffee powder, which is typically attached to the machine using a "twisting" action), or contained in a "bladder" located inside the mouth filter, or in the case of a Nespresso machine, in its own disposable aluminium bladder. In smaller machines, the electronic pump will generate a significant amount of noise. This noise is masked in larger machines or by the background noise of busy restaurants or cafes.

There are also many devices alleged to have an "espresso" function, which are not designed to reach the operating pressures required to extract sufficient aroma compounds and essential oils from the coffee beans.

Because the water boilers and high pressure water pumps and their necessary plumbing, pressure bypass valves and other engineering requirements tend to be large and heavy, most espresso machines tend to be quite bulky and heavy. For example, they would not be easily contained within a backpack if at all, and would be too heavy to be conveniently carried.

However, the market for portable espresso makers exists and has heretofore been provided by several categories of devices, including steam powered mocha makers, water expansion devices, manual water pump devices, manual air pump devices, and others.

Mocha kettles rely on low vapor pressure to force heated water through the coffee grounds. This product is often so-called espresso, but does not produce true foam due to the low operating pressure. Which can more accurately be considered as stronger coffee. The mocha kettle consists of three vertically arranged sealed chambers. The intermediate chamber is connected to each of the other chambers by a thin conduit. The water is heated in the bottom chamber where it also creates a steam head. This pushes the water into the intermediate chamber, storing the ground coffee therein. The water passes through the ground coffee and is forced by the continuous release of steam from the lowest chamber into the upper chamber where it is stored waiting to be poured out by the operator. The original mocha kettle required a stove to provide its heat, however a number of variations of mocha kettles have been created, including those with their own heating element, and those which lack a top chamber but instead extend the upper pipe into an inverted U-shape so that it will pour directly into a container, such as an espresso cup, where the beverage is waiting to be drunk. (this last-mentioned device is patented.) all devices of this type must be operated on top of an external or internal heating source. Their steam-based designs lack the pressure required to generate foam.

The water expansion device (also patented) is similar in principle to a steam powered mocha kettle, but uses the property of water to expand when heated to provide operating pressure. These devices also lack continuously high operating pressures.

Manual water pump machines use a single stroke piston pump attached to a large handle. The user pulls down on the handle in a smooth motion to force the piston into the chamber containing the hot water and thereby push the water through the coffee grounds. These machines tend to be large and heavy and require a high degree of skill to operate. Smaller alternatives have been developed that do not achieve suitable operating pressures.

The latest category of devices is the manual air pump machines. There are two types of such devices, which we may refer to as pressure storage and continuous pressure devices. Pressure reservoirs, such as hand-held coffee makers (Handpresso), use a pump similar to that used to inflate bicycle tires to compress air into a small air reservoir. The stored gas passes into the chamber containing the hot water once the gas cylinder reaches sufficient pressure. The hot water then exits under pressure through a second chamber containing coffee grounds and from there into a beverage container. Generating a pressurized gas charge sufficient to produce espresso with a hand-held coffee machine requires approximately 40 pump handle strokes. Although this is a laborious work, the espresso coffee produced is not good, since the device rapidly reduces the operating pressure. Optimal espresso coffee products require continuous high pressure throughout the 25-30 second extraction process.

A continuous pressure device such as the Preva (Preva) device attaches a manually driven piston air pump directly to the chamber containing the hot water. Once the user starts to operate the device, it starts to release the pressure through the bottom of the chamber, thereby forcing the water through the coffee powder. The conventional devices produce only a small amount of pressure and the resulting beverage lacks most of the quality of good espresso. When the operator continues to suck after all the water has been drained, the air will mix with the water stored in the ground coffee and create a slight air bubble on top of the coffee. Such bubbles are distinct from foams.

To date, the correct operating pressure for good quality espresso products has only been achieved by large hand or water pump driven solutions. The size of espresso machines, their electrical requirements, and the use of internal water heaters have hindered the design of portable units based on the same approach. To create a portable espresso machine that does not require external power, new designs need to be developed.

The following graph 1 shows the difference between the operating pressure profile and the ideal pressure profile during the whole extraction of espresso coffee for different types of machine.

The hand-held coffee machine (handpress) device achieves its initial pressure because of the small size of the pressure vessel and the maximum pressure of about 130 psi. The pressure drops rapidly as compressed air is released into the water reservoir.

The pressure required for extracting espresso coffee cannot be obtained with the conventional device, since the compressed air pumped into the water reservoir pushes the water into the ground material as soon as any positive pressure is achieved. The pulsating pressure pattern is due to the continuous pumping action that the user needs to perform until the coffee has been dispensed.

The espresso machine profile shows the correct pressure profile required to obtain a high quality espresso taste and foam. While the particular pressure of the espresso machine graphic may vary by +/-20psi, which is typical of those found in professional and high-end consumer espresso machines.

Water pressure of different espresso machines

Accordingly, there is a need in the art for an improved espresso machine that is portable and easy to use and that also can brew good quality espresso beverages. As will be seen, the present invention provides such a device in an advantageous manner and in a related manner, and also may be used alternatively for other beverages.

Drawings

FIGS. 1, 2A, 2B and following FIGS. 1-4 are schematic illustrations of a portable brewing device constructed in accordance with the present invention.

Fig. 2C and 2D are detailed views of an operating switch constructed in accordance with the present invention.

Figure 2E is a flow chart showing operation of an apparatus constructed in accordance with the present invention.

Figures 2, 3 and 4A show different lid and seal configurations for sealing a chamber or container containing coffee grounds and a chamber or container containing water.

Figures 5 and 6 show a commercial embodiment of an apparatus constructed in accordance with the present invention.

Detailed Description

In the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and elements have not been described in detail as not to unnecessarily obscure aspects of the present invention.

It will be readily understood that the components of the present invention, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following more detailed description of the embodiments of the apparatus and method of the present invention, as represented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely illustrative of selected embodiments of the invention.

The present invention has been developed in response to the present state of the art, and in particular, in response to the problems and needs in the art that have not yet been fully solved by currently available espresso coffee and other beverage brewing methods and mechanisms. Accordingly, the present invention has been developed to provide novel apparatus and methods for portably brewing espresso. The features and advantages of the invention will become more fully apparent from the following description and appended claims, along with any amendments made thereto, and any amendments made by those claims or issued, or may be learned by the practice of the invention as set forth hereinafter.

Although the following description provides specific details relating to espresso products extracted from ground coffee using hot water, the present invention may be used to extract from any suitable base product using any suitable liquid, including flavored liquids, broken tea, herbs and spices, as well as any other combination of extracts and extraction components as desired.

The present invention provides a portable beverage machine, shown and described as a portable espresso maker, which obtains the operating pressure for extracting an espresso beverage from ground coffee (or "brew ingredients"), wherein the pressure required for such extraction is stored in a compressed gas container, controlled by means of a pressure regulator and fed to a water container containing the hot water required for making the beverage. Other beverages can be brewed by the present method and a portable device constructed in accordance with the present invention can have many different applications, such as a universal hot beverage device. Alternatively, it may be a dedicated device for brewing only espresso coffee, or a dedicated device for brewing only tea, etc. Those skilled in the art will appreciate the applicability of the invention and the ability to make, use or sell useful products that include elements of the invention. The invention is not limited to any particular application, however, and extends to all equivalents that may be practiced within the scope of the claims.

In general, the present invention provides apparatus and methods in various fields as shown and described herein.

In one embodiment, a portable brewing device for brewing a hot beverage such as espresso is provided that includes a compressed gas container in communication with a pressure regulator configured to control the pressure of gas released from the compressed gas container. The release switch is configured to communicate with the pressure regulator and configured to release the pressure controlled gas when actuated by a user. The water container is configured to receive a pressure controlled gas when the switch is actuated by a user. The mixing vessel is capable of holding a brewing substance and is configured to communicate with the water vessel and is further configured to receive water from the water vessel through the brewing substance when pressure is released from the gas container through the pressure regulator. The outlet is configured to release a brewed product produced by the water flowing through the brewing substance contained in the mixing vessel when brewing.

In one embodiment, the device includes a piercing element configured to pierce the compressed gas container to release compressed gas under control of the pressure regulator. The release valve may be configured to pierce the compressed gas container under control of the pressure regulator to release the compressed gas.

The compressed gas container may be a pre-compressed and sealed container, and wherein the release valve is a piercing member configured to pierce the container to release the compressed gas.

The pressure regulator may be a manual controller configured to regulate the pressure of gas released from the compressed gas container.

The device may further comprise a release valve configured to expose the compressed gas to the pressure regulator to enable controlled release. The valve may not be located between the source of pressurized gas and the regulator, but may instead be located between the regulator and the water container.

The pressure regulator may be configured to control a pressure within the water reservoir. The pressure regulator may alternatively be configured to control the pressure released from the compressed gas container. The pressure regulator may be configured to raise and lower the pressure within the water container to cause a controlled transfer of water from the water container into the meal container. The pressure regulator may be configured to control the pressure within the water container to transfer water from the water container to the meal container in a controlled manner.

The device may include a water dispenser configured to dispense water transferred into the grounds container in a controlled manner such that the water is evenly distributed over the grounds, optimizing the brewing process. The water dispenser may be configured to dispense the water transferred into the grounds container in a controlled manner such that the transferred water is evenly distributed over the surface of the grounds contained in the grounds container.

The safety release valve may be configured to release pressurized gas to a location other than the water reservoir under predetermined conditions. Also, the water container may have a removable lid for adding water. The device may have at least one access cap, wherein the safety relief valve is configured to prevent pressure relief from the compressed gas container when the cap is removed. The coffee container may have a removable lid for adding coffee powder alone or in combination with a lid on the water container.

Alternatively, hot water may be supplied to the portable device, which may eliminate the need for a water container or chamber, although both may be included in the portable device. In this sense, portable may mean relatively portable, wherein the device can be used to brew a beverage when connected to a source of hot water, such as a sink, an attached source of water, such as an instant hot tap found in many modern kitchens, or any other source of hot water.

The water container and the grounds container may be combined and have adjacent openings, and the portable espresso maker further includes a removable lid for accessing the adjacent openings to add water and grounds. Such a device may include at least one access cap, wherein the safety relief valve is configured to prevent pressure from relieving pressure from the compressed gas container when the cap is removed. An auxiliary port may be included in the valve that also serves as a passage for the water container to release steam generated by the boiling water when filled with boiling water without pushing the water into the powder container.

The access lid may be overlaid on the water container and the auxiliary port in the valve also serves as a passage for the water container when filled with boiling water to release steam generated by the boiling water without pushing the water into the powder container. The auxiliary port may be used as a passageway to release excess pressure above a threshold at the end of the brewing process to allow the access lid to be safely openable on top of the water container.

A safety valve may be included to prevent accidental release of compressed gas from the regulator to the water container. The valve may allow compressed gas to flow only when the cap is fully depressed. This prevents the user from being injured in the event of accidental escape of gas.

The safety valve may be a one-way safety valve that prevents accidental release of compressed gas from the regulator to the water container. The one-way safety valve prevents an accidental release of the compressed gas from the regulator to the water container, wherein the one-way valve is configured to allow the compressed gas to flow only when the lid is fully closed, thereby preventing the gas from flowing outside the water container.

The one-way relief valve prevents accidental release of compressed gas from the regulator to the water reservoir.

The device may include a convenience light configured to illuminate the surrounding area from which brewed espresso is poured.

The device may include at least one access cap, wherein the safety relief valve is configured to prevent pressure release from the compressed gas container when the cap is removed. The device may alternatively include a first lid configured to cover the powder contained within the mixing container and a second lid to cover the water contained within the water container. Alternatively, it may comprise a double-sealed lid configured to cover the powder contained in the mixing container under one sealable covering and the water contained in the water container under a second sealable covering.

The apparatus may include a heat exchanger configured to warm gas released from the compressed gas container to facilitate flow of the released gas into the water container.

In another embodiment, a portable brewing device is provided that includes a compressed gas container, and further includes a pressure regulator coupled to the compressed gas container and configured to control the pressure of gas released from the compressed gas container. The device may further include a release switch in communication with the pressure regulator and configured to release the pressure controlled gas when actuated by a user, and the water reservoir is configured to receive the pressure controlled gas when the switch is actuated by the user. A mixing vessel is included having the ability to hold a brew substance, the mixing vessel being in communication with the water vessel and configured to receive water from the water vessel to pass through the brew substance when pressure is released from the gas container through the pressure regulator. The outlet is configured to release a brewed product produced by the water flowing through the brewing substance contained in the mixing vessel when brewing.

The device may include a gas release mechanism configured to release compressed gas from the compressed gas container under control of the pressure regulator. The gas release mechanism may be configured to release compressed gas under control of the pressure regulator. The gas release mechanism may be configured to vent into the compressed gas container, allowing the release switch to release compressed gas managed by the pressure regulator.

The compressed gas container may be a pre-compressed and sealed container, and wherein the release valve is a piercing member configured to pierce the container to release the compressed gas.

The pressure regulator may be a manual controller configured to regulate the pressure of gas released from the compressed gas container. The pressure regulator may be configured to control a pressure within the water reservoir.

The pressure regulator may be configured to raise and lower the pressure within the water container to cause a controlled transfer of water from the water container into the meal container. The pressure regulator may be configured to control the pressure within the water container to transfer water from the water container to the meal container in a controlled manner.

A water dispenser may be included that is configured to dispense water transferred into the grounds container in a controlled manner. The water dispenser may be configured to dispense the water transferred into the grounds container in a controlled manner such that the transferred water is evenly distributed over the surface of the grounds contained in the grounds container.

A safety release valve may be included and configured to release pressurized gas to a location other than the water reservoir under predetermined conditions.

The water container may have a removable lid for adding water. There may be at least one access cap, wherein the safety relief valve is configured to prevent pressure from being released from the compressed gas container when the cap is removed. There may be a removable lid for adding coffee grinds.

The water container and the grounds container may be combined and have adjacent openings, and the portable espresso maker further includes a removable lid for accessing the adjacent openings to add water and grounds.

The apparatus may include at least one access cap, wherein the safety relief valve is configured to prevent pressure from being released from the compressed gas container when the cap is removed.

The convenience light may be configured to illuminate the surrounding area from which brewed espresso is poured.

In one embodiment, the first lid may be configured to cover the powder contained in the mixing container and the second lid is configured to cover the water contained in the water container.

The double-sealed lid may be configured to cover the powder contained within the mixing container under one sealable covering and the water contained within the water container under a second sealable covering.

The heat exchanger may be configured to warm gas released from the compressed gas container to facilitate flow of the released gas into the water container.

There may be embodiments in which one or more heating elements are provided. The portable brewing device may comprise: a compressed gas container; a pressure regulator coupled to the compressed gas container and configured to control a pressure of gas released from the compressed gas container; a release switch in communication with the pressure regulator and configured to release the pressure controlled gas upon actuation by a user; a water container configured to receive a pressure controlled gas when the switch is actuated by a user; a heating element configured to raise a temperature of the water container; a mixing vessel having a brew substance, the mixing vessel in communication with the water vessel and configured to receive water from the water vessel to pass through the brew substance when pressure is released from the gas container through the pressure regulator; and an outlet configured to release a brewed product produced by water flowing through the brewing substance contained in the mixing vessel when brewing.

The heating element may be connected to a power source to heat water in the water container. Alternatively, the heating element comprises a portable power source for heating the water in the water container. The heating element further comprises a portable power source for heating the water in the water container.

Yet another embodiment may provide a portable espresso brewing device having: a compressed gas container; a pressure regulator coupled to the compressed gas container and configured to control a pressure of gas released from the compressed gas container; and a valve in communication with the pressure regulator that controls the flow of compressed gas into the water container. The device may further comprise an auxiliary port in the valve which also serves as a passage for the water container when filled with boiling water to release steam generated by the boiling water without pushing the water into the powder container. This passage releases the excess pressure at the end of the brewing process allowing safe opening of the lid on top of the water container. It may further comprise a safety check valve which prevents accidental leakage of compressed gas from the regulator to the water container. The valve allows the flow of compressed gas only when the lid is fully depressed, the water container is in communication with the pressure regulator, the grounds container is in communication with the water container and is configured to receive water from the water container to brew espresso when pressure is released from the gas container through the pressure regulator, and the outlet is configured to release espresso that is produced when water flows through the grounds contained in the grounds container when brewed.

In the embodiment shown in fig. 1 and cross-sectional view fig. 1A, it can be seen that the device employs a compressed gas container (222) held in the device handle (202), a piercing unit (204), a pressure regulator (206), an air flow valve switch (208) comprising two ports, a safety one-way valve (234), a water container for holding hot water (230) and a grounds container for holding ground coffee or pre-made coffee beans (232) contained within a primary operating container (218), a water dispenser (236), a pressure-resistant lid for closing the water and grounds containers (232), two separate seals to maintain different pressures between the water and grounds containers, a snap ring to lock the lid to the primary operating container (210), a water transfer conduit (240), an outlet system (216), and two dispensing nozzles (214).

Referring to fig. 2A, the operational directional path 250 from the compressed gas container through and into the water container 220 is shown in bold lines.

Fig. 2B shows the reverse path used in the safe mode, wherein the gas pressure from the water container caused by the hot water is released from the path 250 to a location outside the device. This occurs when there is excess pressure in the water reservoir and the switch is not depressed. Referring to fig. 2C, the secure path is shown in more detail. The valve and switch assembly 260 may be assembled within the device body. When the switch button 208 is not depressed by the user, the path 273 is open to allow gas to freely flow from the water container along the path 273 (the same as the path 252 of fig. 2B). The plunger or piston 262 is lifted out of the way and depressed by a spring 270 or other resisting mechanism located within the chamber 271. The plate 272 completes the chamber with an O-ring to seal the chamber 272 in operation, but opens in a safe mode. The path allows gas to flow from path 266 to path 264, releasing gas pressure from the water chamber to a location outside the device. The chamber 280 is sealed closing off the path 268 to the compressed gas container. This shuts off the gas pressure when the device is not engaged and the button 208 is not pressed. A spring 282 holds the plunger or piston 262 against the O-ring 276 to close the chamber 280 and the path 268.

Referring to fig. 2D, operating fluid path 275 is shown with path 268 flowing to path 266, which path 266 is the path from the compressed gas container to the water container, as shown in fig. 2A and 2B.

The device constructed according to the invention has advantages over the existing devices due to its light weight, allowing it to be held and operated by one hand, its small size making it very portable and easy to store, and it is made of very cost-effective components such as injection molded plastic, making it potentially more affordable than other espresso machines that meet similar operating pressures. In the embodiment shown in fig. 1, the device can also be used without a power source. The only external energy sources required are hot water and a gas cylinder containing compressed gas.

The compressed gas cartridge may be of the disposable, single-use type, or a compressed gas cartridge that may be refilled in many ways, some examples being a gas pump provided in the espresso maker or in a stand into which the espresso maker may be fitted, or by transferring compressed gas from an auxiliary gas cartridge.

In the case of a disposable cartridge, a method of piercing the cartridge is required. One example is an iSI brand disposable gas cartridge and cream whipper maker.

Furthermore, the horizontal linear arrangement of the water and powder containers in the illustrated embodiment prevents water from continuously flowing from the water container through the powder container due to gravity or other siphoning effects when the device is not pressurized. However, the seal arrangement of the lid of the device in this embodiment creates a small positive pressure on the top of the water container when the lid is closed, resulting in a small amount of water flowing into the powder container through the water tube (240). This provides a pre-injection of ground coffee, allowing it to expand slightly and lock against the side of the powder container. This pre-infusion will typically last only a few seconds until the user is ready to make an espresso. Many commercial espresso machines also provide for pre-infusion, as the expansion of the coffee ensures that once the flow of water for the remaining espresso occurs, it will quickly create the appropriate counter pressure on the water, which helps to ensure the desired extraction. Once the lid is fully sealed, the safety check valve opens preventing steam pressure from building up in the water container, which would push the water further into the grounds container, causing unwanted dripping of coffee before the valve switch is activated.

Another embodiment may use a more conventional vertical arrangement that places the water chamber before the espresso receptacle, connected by a length of tubing.

In yet another embodiment, an espresso maker may have an electronic system for heating the water, as well as an additional output system and switch for controlling the flow of steam for heating and frothing the milk. Power may be provided by a variety of methods, including wires from a wall socket, or by a stored charge such as a battery, or by contacts that have their own base of electrical supply. The electronic system may also provide the user with additional features, such as indicator lights or temperature readers to indicate when the water is heated to the desired temperature for making espresso or making steam.

The espresso maker shown in fig. 1 is of the following type: which uses a disposable single use cartridge and does not include a refill or electronic system.

To produce espresso with the invention shown in fig. 1, the user will fill the powder container with ground coffee or suitable coffee beans. The water container is filled with hot water and the lid is fitted down onto two sealing ridges that surround the water and coffee containers, as shown in fig. 2. The separate seal ensures that there is no transfer of air or water between the water and the coffee container other than through the water transfer conduit. The seal also allows the water and powder containers to establish and maintain the operating pressure of the device when pressurized gas is allowed to enter the top of the water container.

Referring to fig. 2, the locking bayonet ring is used to lock around the bayonet connector (1) to force the lid down to the correct position and ensure that it is securely fixed in such a way that it can withstand the pressure generated within the device. The arrangement of the bayonet on the body of the device and the sealing ridges (7) and (6) of the water (3) and powder (5) containers with the lid creates a one-way "key" pattern which ensures that the lid can be locked down only in its single precise orientation. In other embodiments, different systems may be used to achieve the desired sealing of the water and powder containers. These include screw-down caps or other types of restraint systems. When the lid is in place, the safety check valve ball (2) is depressed by a mating protrusion on the lid, opening the gas outlet passage.

The compressed gas container is placed in the device handle. Rotation of the handle causes the cartridge to screw down onto the piercing member whereby the air flow can pass through the air inlet to the pressure regulator. The gas gradually drops to the target pressure and continues on to the valve switch. The steps just mentioned may not be required in embodiments of the invention in which a refillable gas cartridge or other supply of compressed gas has been connected to the gas inlet by some other means, such as a length of pressure tubing. The disposable gas cartridge has an internal pressure of approximately 600 psi. The pressure regulator provides an outlet pressure that can be adjusted to produce a desired pressure between 135 and 150psi for making espresso. In other embodiments, the pressure may be adjustable by the user.

When the valve switch is activated, gas is allowed to flow into the top of the water container through the safety check valve. The safety check valve ball is pushed against the retaining spring when the lid is not in place so that it blocks the flow of gas.

With reference to fig. 3, when the lid (1) is in place, the protrusion (5) pushes against the top of the safety check valve ball, pushing it down into the gas outlet duct and opening the duct for the gas flow.

As the gas flows into the top of the water container, it pressurizes the air at the top of the chamber. This pressure pushes water from the bottom of the water container through the water transfer conduit and into the top of the coffee container. The diameter of the water transfer conduit ensures that the water flows at a sufficient velocity to impinge on the water dispensing element (4 and detail fig. 4A) provided in the lid. The water dispensing unit sprays water uniformly on the surface of the coffee.

When the water continues to flow, it quickly fills the top of the coffee container, and when properly ground coffee is in place, it will build up the desired operating pressure, whereby all the espresso ingredients will be properly extracted and produced. The espresso flows out of the bottom of the coffee container, through the outlet manifold and into one or more beverage containers. The outlet manifold may be varied to cater for different outlet configurations including single or dual outlets.

When the valve is released, the gas flow is stopped and any pressurized gas remaining in the water reservoir is allowed to flow back through the auxiliary valve port on the switch, where it can exit the device in a controlled manner. Although gas can also escape through the coffee chamber and its outlet, the assisted exit method of the switch will quickly release pressure from the main chamber, which will prevent further flow of coffee (or droplets) into the cup. The quick release of the pressure also allows the lid to be opened in a safe manner almost immediately after the end of the production of espresso coffee.

The pressure flow of the present invention can be seen in fig. 2A, 2B and process flow diagram 2E, where the gas stream flows from the compressed gas container through the pressure regulator. When the operator depresses the valve switch, the auxiliary valve port closes and the main valve port opens, allowing gas to flow to the safety check valve. If the lid is opened, the air flow will be stopped by the safety check valve. When the lid is closed, a protrusion in the lid opens the safety check valve and allows gas to flow into the water container. The gas pressure pushes the water in front of it through the water transfer duct where it is sprayed by the water dispensing means on top of the coffee contained in the grounds container. From there the water will pass down through the ground coffee chamber and into the outlet system, whereby the water leaves the device via the dispensing nozzle. The release valve is opened and closed to close the primary valve port and to configure a gas passage through the switch such that any above atmospheric pressure within the sealed water and powder container is released through the secondary valve port.

The gas and pressurization in the present invention can be seen in fig. 2A and process flow diagram 2E. Referring to fig. 2E, a brewing cycle begins 302 by the operator loading a container of brewing ingredients, hot water and compressed gas into device 304. Rotating the handle causes it to screw forward until the gas container is pierced 306. Gas flows from the compressed gas container to the pressure regulator 308. The pressure regulator regulates the gas output pressure 310 by raising the too low pressure 312 or lowering the too high pressure 314 until it reaches the correct pressure. The pressure regulator continues this regulation process throughout the cycle of operation of the device. When the operator depresses the valve switch 316, the auxiliary valve port 318 is closed to prevent gas from exiting through the safety passage, and the main valve port 320 is opened. The gas operating path in this configuration is shown in fig. 2A. Referring back to fig. 2E, the gas flows to the safety check valve 322. If the lid is opened, the air flow will be stopped by the safety check valve. Pre-injection 325 will occur when the lid is closed by the bayonet ring and locked into place 324. When the lid is fully closed, a protrusion in the lid opens the safety check valve 326 and allows gas to flow into and pressurize 328 the water container. The gas pressure pushes the water in front of it through the water transfer and outlet pipe 330 where it is sprayed by the water dispensing means onto the top 332 of the coffee contained in the grounds container. From there the water will pass downwardly through the ground coffee or brewed substance 334 and into the outlet system, whereby the water leaves the device 336 via the dispensing nozzle. The release valve switch 338 closes the primary valve port 340 and prevents any further gas flow from the regulator and gas container, and opens the secondary valve port 342. This reconfigures the gas path through the switch so that any above atmospheric pressure within the sealed water and powder container is released 342 through the auxiliary valve port. The operator removes any used brewed ingredient or coffee grounds from the coffee container and removes the used gas container 344 from the device. This concludes brewing cycle 346.

Referring to fig. 1-4, later, an alternative apparatus and method for transferring the required water pressure to the port filter is shown. These figures will be renumbered by later modifications. By using compressed air (or Co2) stored in the cartridge 1 purchased or refilled to an existing cartridge by an external pump mechanism, the water 19 in the water kettle can be pressurized and forced through the coffee powder 32 in the mouth filter, resulting in a coffee beverage that is pleasing to the consumer. The use of compressed air or gas eliminates the need for an electronic pump, provides near silent operation, and can be designed to be held and used by a single hand, as can be seen from the design of fig. 6. A single small cartridge can produce approximately 40 espresso shots under normal use and then requires replacement of the cartridge or refilling.

To use the device, the user must first fill the portafilter basket 27 with coffee or coffee beans. This is accomplished by releasing the port filter locking mechanism 21 and pulling the port filter handle 20 downward. The port filter 34 is pivotable about the hinge 35 at one end of the port filter 34 to be slidable out from behind the hinge 35. This enables the oral filter to be removed entirely from the device, simplifying the recharging of the oral filter basket 27. The port filter basket 27 is also removable from the port filter 34 for cleaning purposes, although in normal operation the entire port filter assembly will simply be rinsed under the faucet. The addition of a stand 31a to the port filter or the addition of a separate holding unit provides stability to the port filter and the entire unit when placed on a table or other surface.

Once the user has completed recharging the oral filter, the end of the oral filter is reinserted behind the hinge 35 and the oral filter is shaken up to the locked position. This may seal the port filter basket 27 against the port filter press seal 33. The user then forces the oral filter locking mechanism 21 to the uppermost position using his index finger, creating a high pressure against the pressure seal 33 and ensuring that the oral filter cannot be shaken to the unlocked position.

Just before using the device to produce espresso, the user will remove the outer pressure shell 12 by counterclockwise rotation of a quarter turn using the pressure shell handle 13. If the outer pressure shell 12 is locked in place by the slide lock 38, the user will first move the slide lock 38 back using the slide lock handle 37. The security features of this device are incorporated into the security pressure lock 9. In case of a large internal pressure in the kettle, the pressure will be transmitted to the piston attached to the pressure lock 9. This will force the piston up, compressing the return spring 10 and pushing the pressure lock pin in an upward direction, blocking the path of the slide lock 38 and thereby preventing the user from rotating the outer pressure housing. To release the internal pressure, the user may depress the manual release button 16. This will cause pressure to pass through the manual pressure release conduit 40 to the now exposed internal piston area of the pressure safety lock, venting through the passage 41 and passage 39, into the internal cavity surrounding the kettle where excess pressure, fluid or steam can escape through the passage provided in the bottom of the device remote from the user's hand near the mouth filter. With low or no internal pressure, return spring 10 will hold the safety lock in the retracted position, moving slide lock 38 back into the handle, and the pressure cap rotated and removed.

Rotating the outer pressure cap also firmly attaches the rotation to the inner pressure cap 11 of the outer pressure cap, resulting in easy unsealing of the kettle and removal of the pressure cap.

The user fills the inner jug 19 with boiling water up to the level indicated by the indicator 36 and replaces the filling cap 12. The water temperature will drop slightly to the desired temperature range of 197F-205F a few seconds after closing the fill cap 12 and positioning the device in the output reservoir. The user then manipulates the thumb switch 15. If the slide lock is not moved to its fully forward position on the outer pressure housing, the slide lock 38 will prevent the thumb switch 15 from moving forward. In the event that the pressure shell does not rotate such that the gap in the upper surface of the pressure shell aligns with the passage through which the sliding lock will move, the lock cannot move forward. This safety feature prevents a user from being able to place the refill cap on the container without rotating it to the locked position.

Sliding the thumb switch 15 forward, the gas release piston 14 moves downward to allow gas to flow through the hole drilled in the center of the piston. In order to ensure a uniform supply of pressure to the kettle, an adjustable gas regulator 3 is included immediately after the gas tank. The user may use the adjustment screw to adjust the pressure of the gas generated at the outlet side of the regulator. Gas regulators are well known and commonly used components.

The temperature of the gas decreases dramatically as it changes from compressed to uncompressed form. This is one of the refrigeration principles. It would be harmful to bring the already refrigerated gas into contact with the water in the kettle, since this would result in the temperature of the water in the kettle falling below its ideal brewing extraction temperature. The thermocouple 5 acts as an expansion and warming chamber for the gas by providing a variable path through which the gas must travel to the exhaust side of the chamber to make multiple contacts with the high thermal conductivity copper disk contained in the thermocouple unit. The disc acts as a heat exchanger for the outer region and the inner chamber within the device handle 7. In an alternative embodiment, the gas may instead exit the regulator 5 and flow through a single conduit that surrounds the inside of the handle 7 and connects back to the gas release piston 14. This will bring the gas into contact with the higher temperature surface. These surfaces in turn receive a helpful temperature increase through heat transfer from the user's hand when the user is holding the device.

The gas flows through the exhaust port of block 14 past pressure relief valve outlet 24. The part 24 is a conventional part featuring a ball bearing which is held against the outlet with the aid of a spring and thereby seals the outlet. When the internal pressure exceeds the pressure provided by the ball and spring, the ball is pushed into its cylinder, allowing gas to escape past the ball and through a passageway provided in the spring receiving area. In this design the gas will pass into the cavity surrounding the kettle, being directed downwards and away from the user.

The gas from the cartridge will then continue to pass under the piston attached to the pressure release button 16, through a small pressure conduit 40 leading back to the manual pressure release piston, and finally into the kettle via port 41.

Pressure in the kettle will build until it reaches the pressure allowed by the gas regulator, pushing water in the kettle down through the outlet port 26. The water will be sprayed on the water distribution grid 29. The distribution grid is a plate through which a large number of small holes are provided. The grate promotes even distribution of water over the surface of the port filter basket, resulting in the remaining water taking multiple paths through the coffee, rather than just one path of least resistance. This exposes more of the coffee powder to water, promoting more complete extraction of essential oils and other ingredients from the coffee, resulting in better basic extraction and foaming.

Once a sufficient amount of water has passed through the device, the user removes his thumb from the slide switch 15, allowing it to be retracted towards the handle. This will allow the gas release piston to move in an upward direction, urged by its return spring, shutting off the flow of gas from the canister.

If the user needs to accompany foamed milk (e.g. latte or cappuccino) in their espresso, they may use an external source to heat the milk and any of the various foaming devices already on the market to prepare the milk for inclusion in the beverage, or they may use the embodiment of the device shown in figures 3 and 4 to prepare the milk.

An alternative embodiment of the invention shown in figures 3 and 4 uses a power supply and control unit to provide power to a heater element fitted into the bottom of the kettle 18. The heater element is automatically operated by the control unit and will heat the water to two possible temperatures: a desired temperature to produce espresso coffee, or a higher temperature suitable for producing steam. The indicator light will show when the unit is ready to operate in either mode. The user would then operate the thumb switch to produce espresso as previously described in the present invention, or operate the steam wand to heat and foam the milk.

Fig. 3 implements an exemplary design using a standard plug as a power source. The power is controlled by an on/off switch 43. Power flows through conductor 45 to power control unit 47. The control unit receives temperature inputs from the steam sensor 54 and/or the water temperature sensor 57. The steam wand is rotated to provide position information to the power control unit. When the steam wand is in the closed position (retracted inside a slot in the bottom of the device handle), the power control unit will turn on the water heater element and display a "wait" indicator light 52 until the water temperature sensor provides data to the control unit indicating that the water has risen to the appropriate temperature for producing a beverage. At which point the control unit will turn off the water heater element and display the "ready" indicator light 53. If the temperature falls back to the predetermined level, it will again power the water heater element, turn off the "ready" indicator light and display a "wait" indicator light until the temperature reaches the correct level.

The pressurized source entering the main kettle suitably includes a U-bend 55 which prevents water from inadvertently flowing back down the inlet pressure tube and out the steam wand. Other protection systems such as a reflux valve may also be used. The flow of steam out of the steam wand is controlled using a rotary knob 56 which is connected to a steam control valve which may be internal or external to the steam control manifold.

When the steam wand is in the open or "down" position shown in fig. 3, the power control unit will use the temperature data from the steam sensor to turn on the water heater element until the appropriate temperature of the steam in the water overhead cavity is reached. When the proper temperature is reached, the unit will have the water heater element on but will display a "ready" indicator light. A continuous supply of heat to the water is required to keep the prepared steam supply continuously generated while the steam unit is in use.

The unit will use a water temperature sensor to ensure that the unit cannot reach a dangerous operating temperature and if this temperature is reached the heater unit is switched off. In the event that the heater element is turned off due to an over temperature condition, the heater element will not switch back on until the entire cell is switched on again. When the over temperature condition is reached, the "wait" indicator light 52 and the "ready" indicator light 53 will flash together in repeated cycles to alert the user to the fault.

The present invention is not limited in all of its embodiments to utilizing power from a primary power source. It is also possible to use a stored power source, or a rechargeable power source, with appropriate batteries added to the design. A special holder stand incorporating a power supply may also be used to provide power to the unit.

The present invention also enables the production of beverages other than espresso. By adapting the mouth filter to contain coffee beans, the mouth filter may also use other types of beans providing beverage ingredients, such as hot chocolate, tea, flavoured coffee or other types of beverages so designed.

Figures 5 and 6 show a commercial embodiment of an apparatus constructed in accordance with the present invention. Figure 5 shows a version in which the gas source is separated from the device. Figure 6 shows a configuration where the gas source is in communication with a hot water source and the water source is in communication with the device. In essence, these embodiments show that the different components can be expanded to larger components outside the device and then accessed with supply lines. This allows the use of high throughput.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described examples are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (57)

1. A portable espresso brewing device comprising:

a compressed gas container;

a pressure regulator coupled with the compressed gas container and configured to control a pressure of gas released from the compressed gas container;

a valve in communication with the pressure regulator and controlling the flow of compressed gas into the water container;

a water reservoir in communication with the pressure regulator;

a grounds vessel in communication with the water vessel and configured to receive water from the water vessel to brew espresso when pressure is released from the gas container through the pressure regulator; and

an outlet configured to release espresso coffee produced by water flowing through grounds contained in the grounds vessel when brewed.

2. A portable espresso brewing device according to claim 1, further comprising: a piercing member configured to pierce the compressed gas container to release compressed gas under control of the pressure regulator.

3. A portable espresso brewing device according to claim 1, further comprising: a release valve configured to pierce the compressed gas container under control of the pressure regulator to release compressed gas.

4. A portable espresso maker according to claim 3, wherein the compressed gas container is a pre-compressed and sealed container, and wherein the release valve is a piercing member configured to pierce the container to release compressed gas.

5. A portable espresso maker according to claim 1, wherein the pressure regulator is a manual control configured to regulate the pressure of gas released from the compressed gas container.

6. A portable espresso brewing device according to claim 1, further comprising: a release valve configured to expose compressed gas to the pressure regulator to enable controlled release, the valve not being located between the compressed gas source and the regulator but between the regulator and the water container.

7. A portable espresso maker according to claim 1, wherein the pressure regulator is configured to control the pressure within the water container.

8. A portable espresso maker according to claim 1, wherein the pressure regulator is configured to control the pressure released from the compressed gas container.

9. A portable espresso maker according to claim 7, wherein the pressure regulator is configured to raise and lower the pressure within the water container to cause a controlled transfer of water from the water container into the grounds container.

10. A portable espresso maker according to claim 1, wherein the pressure regulator is configured to control pressure within the water container to transfer water from the water container into the grounds container in a controlled manner.

11. A portable espresso maker according to claim 10, further comprising: a water dispenser configured to dispense the water transferred into the powder container in a controlled manner.

12. A portable espresso maker according to claim 10, further comprising: a water dispenser configured to dispense the water transferred into the grounds container in a controlled manner such that the transferred water is evenly distributed over the surface of the grounds contained in the grounds container.

13. A portable espresso maker according to claim 1, further comprising: a safety release valve configured to release pressurized gas to a location other than the water container under predetermined conditions.

14. A portable espresso maker according to claim 1, wherein the water container has a removable lid for adding water.

15. A portable espresso maker according to claim 1, further comprising: at least one access cap, wherein the safety relief valve is configured to prevent pressure relief from the compressed gas container when the cap is removed.

16. A portable espresso maker according to claim 1, wherein the coffee container has a removable lid for adding ground coffee.

17. A portable espresso maker according to claim 1, wherein the water container and the grounds container are combined and have adjacent openings, the portable espresso maker further comprising a removable lid for accessing the adjacent openings for adding water and grounds.

18. A portable espresso maker according to claim 13, further comprising: at least one access cap, wherein the safety relief valve is configured to prevent pressure relief from the compressed gas container when the cap is removed.

19. A portable espresso maker according to claim 1, further comprising: an auxiliary port in the valve that also serves as a passageway for the water container when filled with boiling water to release steam generated by the boiling water without pushing water into the powder container.

20. A portable espresso maker according to claim 1, further comprising: a pass-through lid which overlies the water container and an auxiliary port in the valve also serves as a passage for the water container when filled with boiling water to release steam generated by the boiling water without pushing the water into the powder container.

21. A portable espresso maker according to claim 20, wherein the auxiliary port acts as a passageway to release excess pressure above a threshold at the end of the brewing process to allow the access lid to safely open at the top of the water vessel.

22. A portable espresso maker according to claim 19, further comprising: a safety valve preventing accidental release of compressed gas from the regulator to the water container, the valve allowing compressed gas to flow only when the lid is fully depressed.

23. A portable espresso maker according to claim 19, further comprising: a one-way relief valve preventing accidental release of compressed gas from the regulator to the water container.

24. A portable espresso maker according to claim 19, further comprising: a one-way safety valve preventing an accidental release of compressed gas from the regulator to the water container, wherein the one-way valve is configured to allow the compressed gas to flow only when the lid is fully closed, thereby preventing the gas from flowing outside the water container.

25. A portable espresso maker according to claim 19, further comprising: a one-way relief valve preventing accidental release of compressed gas from the regulator to the water container.

26. A portable espresso maker according to claim 1, further comprising: a convenience light configured to illuminate the surrounding area from which brewed espresso coffee is to be poured.

27. A portable espresso maker according to claim 17, further comprising: at least one access cap, wherein the safety relief valve is configured to prevent pressure release from the compressed gas container when the cap is removed.

28. A portable espresso maker according to claim 1, further comprising: a convenience light configured to illuminate the surrounding area from which brewed espresso coffee is to be poured.

29. A portable espresso maker according to claim 1, further comprising: a first lid configured to cover the powder contained in the mixing container and a second lid configured to cover the water contained in the water container.

30. A portable espresso maker according to claim 1, further comprising: a double-sealed lid configured to cover the powder contained within the mixing container under one sealable covering and the water contained within the water container under a second sealable covering.

31. A portable espresso maker according to claim 1, further comprising: a heat exchanger configured to warm gas released from the compressed gas container to facilitate flow of the released gas into the water container.

32. A portable brewing device comprising:

a compressed gas container;

a pressure regulator coupled to the compressed gas container and configured to control a pressure of gas released from the compressed gas container;

a release switch in communication with the pressure regulator and configured to release the pressure controlled gas when actuated by a user;

a water container configured to receive the pressure controlled gas when the switch is actuated by a user;

a mixing vessel having a brew substance, the mixing vessel in communication with the water vessel and configured to receive water from the water vessel to pass through the brew substance when pressure is released from the gas container through the pressure regulator; and

an outlet configured to release a brewed product produced by water flowing through a brew substance contained in the mixing vessel when brewed.

33. A portable brewing device according to claim 32, further comprising: a gas release mechanism configured to release compressed gas from the compressed gas container under control of the pressure regulator.

34. A portable brewing device according to claim 33, wherein the gas release mechanism is configured to release compressed gas under the control of the pressure regulator.

35. A portable brewing device according to claim 33, wherein the gas release mechanism is configured to vent into the compressed gas container, allowing the release switch to release compressed gas managed by the pressure regulator.

36. A portable brewing device according to claim 33, wherein the compressed gas container is a pre-compressed and sealed container, and wherein the release valve is a piercing member configured to pierce the container to release compressed gas.

37. A portable brewing device according to claim 32, wherein the pressure regulator is a manual control configured to regulate the pressure of gas released from the compressed gas container.

38. A portable brewing device according to claim 32, wherein the pressure regulator is configured to control the pressure within the water vessel.

39. A portable brewing device according to claim 32, wherein the pressure regulator is configured to raise and lower pressure within water vessel to cause a controlled transfer of water from water vessel into the grounds vessel.

40. A portable brewing device according to claim 32, wherein the pressure regulator is configured to control the pressure within water vessel to transfer water from the water vessel into the grounds vessel in a controlled manner.

41. A portable brewing device according to claim 40, further comprising a water dispenser configured to dispense water transferred into the grounds vessel in a controlled manner.

42. A portable brewing device according to claim 40, further comprising: a water dispenser configured to dispense the water transferred into the grounds container in a controlled manner such that the transferred water is evenly distributed over the surface of the grounds contained in the grounds container.

43. A portable brewing device according to claim 32, further comprising: a safety release valve configured to release pressurized gas to a location other than the water container under predetermined conditions.

44. A portable brewing device according to claim 32, wherein: the water container has a removable lid for adding water.

45. A portable brewing device according to claim 44, further comprising: at least one access cap, wherein the safety relief valve is configured to prevent pressure relief from the compressed gas container when the cap is removed.

46. A portable brewing device according to claim 32, wherein the coffee container has a removable lid for adding coffee grounds.

47. A portable brewing device according to claim 32, wherein the water vessel and grounds vessel are joined and have adjacent openings, the portable espresso maker further comprising a removable lid for accessing the adjacent openings for adding water and grounds.

48. A portable brewing device according to claim 42, further comprising: at least one access cap, wherein the safety relief valve is configured to prevent pressure relief from the compressed gas container when the cap is removed.

49. A portable espresso maker according to claim 32, further comprising: a convenience light configured to illuminate the surrounding area from which brewed espresso coffee is to be poured.

50. A portable espresso maker according to claim 32, further comprising: a first lid configured to cover the powder contained in the mixing container and a second lid configured to cover the water contained in the water container.

51. A portable espresso maker according to claim 32, further comprising: a double-sealed lid configured to cover the powder contained within the mixing container under one sealable covering and the water contained within the water container under a second sealable covering.

52. A portable espresso maker according to claim 32, further comprising: a heat exchanger configured to warm gas released from the compressed gas container to facilitate flow of the released gas into a water container.

53. A portable espresso brewing device comprising:

a compressed gas container;

a pressure regulator coupled to the compressed gas container and configured to control a pressure of gas released from the compressed gas container;

a valve in communication with the pressure regulator and controlling the flow of compressed gas into the water container;

an auxiliary port in the valve that also serves as a passageway for the water container when filled with boiling water to release steam generated by the boiling water without pushing water into the grounds container, the passageway releasing excess pressure at the end of the brewing process allowing the lid to safely open at the top of the water container;

a safety one-way valve preventing accidental release of compressed gas from the regulator to the water container, the valve allowing compressed gas flow only when the lid is fully depressed;

a water reservoir in communication with the pressure regulator;

a grounds vessel in communication with the water vessel and configured to receive water from the water vessel to brew espresso when pressure is released from the gas container through the pressure regulator; and

an outlet configured to release espresso coffee produced by the water flowing through the grounds contained in the grounds vessel when brewed.

54. A portable espresso maker according to claim 53, wherein the heating element is connectable to a power source to heat water in the water container.

55. A portable espresso maker according to claim 53, wherein the heating element comprises a portable power source for heating water in the water container.

56. A portable espresso maker according to claim 53, wherein the heating element comprises a portable power source for heating water in the water container.

57. A portable espresso brewing device comprising:

a compressed gas container;

a pressure regulator coupled to the compressed gas container and configured to control a pressure of gas released from the compressed gas container;

a valve in communication with the pressure regulator and controlling the flow of compressed gas into the water container;

an auxiliary port in the valve that also serves as a passageway for the water container when filled with boiling water to release steam generated by the boiling water without pushing water into the grounds container, wherein the auxiliary port releases excess pressure at the end of the brewing process allowing the lid to safely open at the top of the water container;

a safety one-way valve preventing accidental release of compressed gas from the regulator to the water container, wherein the valve allows compressed gas to flow only when the lid is fully depressed;

a water container configured to hold water and communicating with the pressure regulator;

a grounds container configured to hold espresso grounds, in communication with the water container and configured to receive water from the water container to brew espresso when pressure is released from the gas container through the pressure regulator to transfer water from the water container and through the grounds; and

an outlet configured to release espresso coffee produced by the water flowing through the grounds contained in the grounds vessel when brewed.