CN102292558A - Nut for loosening prevention - Google Patents

Abstract

A nut for loosening prevention whereinto a synthetic resin molding has been inserted is disclosed. The nut for loosening prevention according to the invention comprises a bolt coupling cavity that has a spiral groove formed on its inner circumference in order to couple with a bolt; a synthetic resin molding seat part that is formed on the face whereon the spiral groove is formed, and a synthetic resin molding that is seated on the synthetic resin molding seat part to forcefully form a thread by the thread of the bolt upon coupling with the bolt, wherein the synthetic resin molding seat part is formed in the groove of a certain length along the length direction of the bolt coupling cavity, and at least one end part of the groove is open externally along the length direction, and a push prevention means is further included in the synthetic resin molding seat part so that the synthetic resin molding may be prevented from being pushed in the length direction of the bolt coupling cavity. Thus the nut for loosening prevention of the invention couples gaplessly with the bolt, and is consequently effective in preventing loosening, and enables the synthetic resin molding to be easily exchanged from the used nut for loosening prevention, so that the nut for loosening prevention may be conveniently reused.

Description

fasten the screw nut

technical field

The invention relates to a lock nut. More specifically, it relates to a nut that inserts a synthetic resin molded body into a helical surface to increase the bonding force with a bolt and prevent the bolt from loosening. Furthermore, the lock nut according to the present invention can replace the above-mentioned synthetic resin molded body so that it can be reused.

Background technique

Bolts and nuts can easily and precisely assemble and fix parts such as mechanical devices, and are the most commonly used mechanical components. But there must be some clearance between the threads of the bolt and the threads of the nut so that they can easily bind to each other. Therefore, bolts and nuts are instantly loosened due to vibration or impact generated on the components. Furthermore, there is a problem that the connection state between the bolt and the nut is poor, and the assembly and fixation of mechanical devices and the like are not firm.

Figure 1 shows a lock nut 10 according to the prior art. With reference to Fig. 1, in order to solve the above-mentioned problem, develop and put into the nylon ring (nylon ring) 30 that does not have screw thread in the inner side of nut, carry out the lock nut that stamping process fixes nylon ring 30.

As long as the bolt is connected to the lock nut 10 , the bolt and the nylon ring 30 form a thread with no gap, which can prevent the bolt from loosening from the lock nut.

However, if the above-mentioned lock nut 10 is once connected with the bolt and then the connection is released, since threads have been formed on the above-mentioned nylon ring 30, it is impossible to form a firm connection again when it is connected again. Therefore, a new lock nut must be replaced in this case to form a firm bond.

Furthermore, since the above-mentioned lock nut is used for external exposure, it is necessary to perform gold plating on the surface. Therefore, the locking nut 10 in the prior art is put into the nylon ring 30, and after the nylon ring 30 is fixed by stamping, the process of gold plating is performed. Therefore, due to the temperature, deformation and damage of the above-mentioned nylon ring 30 when gold-plated, the lock nut 10 of the prior art produces more defective products.

Contents of the invention

The present invention constituted as described above has the following effects.

First, in the present invention, a synthetic resin molded body without a spiral groove is attached to the seat portion formed inside the above-mentioned lock nut, so that the above-mentioned lock nut and the bolt form a connection without gaps when they are connected, and there is reliable loosening prevention. Effect.

Second, the present invention can easily remove the aforementioned synthetic resin molded body from the used lock nut and replace it with a new synthetic resin molded body. Therefore, the present invention facilitates the reuse of lock nuts, providing an effect of reducing costs. In particular, the present invention forms an annular ring on the synthetic resin molded body, which acts as a handle when removing the synthetic resin molded body from the lock nut or attaching the synthetic resin molded body to the lock nut. Therefore, the present invention facilitates replacement of the synthetic resin molded body on the aforementioned lock nut. Also, the aforementioned annular ring is more useful on small nuts where finger access is difficult.

Thirdly, in the present invention, in the surface gold plating process, the lock nut can be completed by attaching the above-mentioned synthetic resin molded body after performing gold plating before attaching the above-mentioned synthetic resin molded body. Therefore, the present invention can be easily applied to the gold plating process, reducing the risk of production defects due to gold plating.

Description of drawings

Figure 1 shows a nylon ring insert nut according to the prior art.

Fig. 2 shows an exploded view of a lock nut structure according to an embodiment of the present invention.

FIG. 3 shows a cross-sectional view along line A-A of FIG. 2 according to an embodiment of the present invention.

Fig. 4 shows an exploded view of a lock nut structure according to another embodiment of the present invention.

Fig. 5 shows a cross-sectional view of a state in which a screw is coupled to a lock nut according to the present invention.

Explanation of reference signs

10: Nylon nut 30: Nylon ring

100: lock nut 110: spiral groove

130: Bolt joint hole 150, 150': Synthetic resin molded body placement part

155: Blocking part 160: Annular ring placement part

170: Synthetic resin molded body 175: Ring ring

200: Bolt

Detailed ways

The present invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same components are shown with the same symbols wherever possible. Also, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted.

FIG. 2 shows an exploded view of a lock nut structure according to an embodiment of the present invention, and FIG. 3 shows a cross-sectional view along line A-A of FIG. 2 . Referring to FIG. 2 and FIG. 3 , the lock nut 100 is composed of a bolt joint hole 130 forming a helical groove 110 , a synthetic resin molded body placement portion 150 , a plugging portion 155 and a synthetic resin molded body 170 .

The helical groove 110 is formed on the bolt coupling hole 130 on the inner surface of the lock nut 100 , and the lock nut 100 is coupled to the bolt 200 through the bolt coupling hole 130 . A synthetic resin molded body seating portion 150 consisting of grooves of a predetermined length is formed on a surface where the helical groove 110 is formed inside the lock nut 100 . The above-mentioned synthetic resin molded body placement part 150 is formed along the direction in which the bolt 200 travels when the bolt 200 is combined with the lock nut 100 to rotate, and the above-mentioned direction is the length direction of the bolt coupling hole 130 . Hereinafter, the longitudinal direction of the bolted hole 130 is the direction in which the bolt 200 travels while the bolt 200 is rotating, and refers to the direction of the rotation axis of the bolted hole 130 .

In this embodiment, the synthetic resin molded body 170 is inserted into the synthetic resin molded body seating part 150 in a block shape without forming a spiral. When the bolt 200 is combined with the nut 100 , the thread of the bolt is forcibly threaded on the block-like synthetic resin molded body 170 , and a tight connection without gaps is formed between the bolt 200 and the aforementioned synthetic resin molded body 170 . Therefore, a firm connection between the lock nut 100 and the bolt 200 in which the synthetic resin molded body 170 is inserted can be formed. These bolts 200 and union nuts 100 ensure high joint stability against external influences such as vibrations.

When the synthetic resin molded body 170 is inserted into the lock nut 100 , it is preferably molded and inserted at a height equal to or slightly higher than the thread of the lock nut 100 .

One end portion of the synthetic resin seating portion 150 forms a plugging portion 155 . The blocking portion 155 prevents the synthetic resin molded body 170 from being extruded in the direction in which the bolt travels when the lock nut 100 is connected to the bolt 200 . Therefore, the blocking portion 155 functions as a push-off prevention device for preventing the push-off of the synthetic resin molded body 170 . When the bolt 200 is fastened, it is necessary to run the bolt 200 in the direction in which the plugging portion 155 is formed to fasten it.

Due to the plugging portion 155, when the bolt 200 is connected with the lock nut 100, the synthetic resin molded body 170 is prevented from being pushed away, and the position is fixed, so that the screw thread generation on the synthetic resin molded body can be smoothly performed.

Since the lock nut 100 of the present invention is formed with the anti-pushing device 155, when placing the synthetic resin molded body 170 on the synthetic resin molded body placement part 150, as long as it is set so that the above-mentioned synthetic resin molded body 170 does not automatically disengage from the placement part 150 to an extent. For example, the synthetic resin molded body 170 is fixed to the seating portion with a thin hard plug. In other words, since the above-mentioned push-off prevention device 155 is provided, there is no need to force other means than the pressing of the bolt 200 in order to fix the synthetic resin molded body 170 at the installation position when the bolt 200 is fastened. And for these reasons, when replacing the above-mentioned synthetic resin 170, it can be pulled out easily. For example, if the synthetic resin molded body is press-fitted and fixed in the seat portion 150 formed inside the lock nut with a strong plug, it will be difficult to pull out the synthetic resin molded body from the lock nut eventually.

The above-mentioned synthetic resin molded body 170 and the above-mentioned synthetic resin molded body seating portion 150 can be formed in plurality. Furthermore, the bonding strength for preventing loosening of the bolt 200 and the lock nut can be adjusted by the number of synthetic resin moldings 170 described above.

Gold plating In the case of the lock nut 100 configured as described above, gold plating is performed in a state where the above-mentioned synthetic resin molded body 170 is separated. Then, after the gold plating is completed, the above-mentioned synthetic resin molded body 170 is placed in the synthetic resin molded body placement portion 150 to complete the lock nut 100 .

When performing zinc chromium film (DACROTIZED) gold plating to improve corrosion resistance, the temperature during gold plating reaches 450°C. At this time, since the lock nut 100 according to the present invention can be gold-plated before being inserted into the synthetic resin molded body 170 , damage to the synthetic resin molded body 170 can be prevented.

On the one hand, nylon is preferably used as the material of the above-mentioned synthetic resin molded body 170 , and nylon 66, which has high heat resistance and impact resistance, is suitably used.

Fig. 4 shows an exploded view of a lock nut structure according to another embodiment of the present invention. Referring to FIG. 4 , the lock nut 100 is formed with a bolt coupling hole 130 forming a spiral groove 110 and a synthetic resin molded body seating portion 150 . Further, grooves having a predetermined length are formed along the longitudinal direction of the bolting hole 130, and the synthetic resin molded body 170 can be placed therein. In particular, an annular ring 175 is formed on the aforementioned synthetic resin molded body 170 in this embodiment. Therefore, although the basic configuration is the same as that of the above-mentioned embodiment, there is a difference in that the annular ring 175 is formed on the synthetic resin molded body 170 .

In this embodiment, the synthetic resin molded body 170 is a block-shaped leg without forming a spiral. In this embodiment, an annular ring 175 attached to one end of the above-mentioned leg is also provided, and the above-mentioned leg and the annular ring 175 are integrally formed. Also, the upper end of the lock nut 100 forms an annular ring seating portion 160 capable of seating an annular ring 175 .

Since the annular ring 175 is formed on the synthetic resin molded body 170, replacement of the synthetic resin molded body 170 becomes easier. That is, when replacing the synthetic resin molded body 170 in the lock nut 100, the annular ring 175 is pulled with fingers, and the synthetic resin molded body 170 is pulled out from the lock nut seating portion 150'. Then, the annular ring 175 of the new synthetic resin molded body 170 is pulled with fingers, and the synthetic resin molded body 170 is inserted into the setting portion 150' for attachment. Therefore, in this embodiment, the synthetic resin molded body 170 can be replaced more easily compared with the above-mentioned embodiment in which the synthetic resin molded body 170 is formed only of a block shape.

The device preventing push-off in this embodiment is the annular ring 175 described above. That is, when the bolt 200 is connected to the lock nut 100, the annular ring 175 catches the pushed-off block-shaped synthetic resin molded body 170 attached to the annular ring 175 to prevent it from being pushed away.

When the bolt 200 is connected to the lock nut 100, the bolt 200 passes through the annular ring 175 and is connected in a direction extending from the annular ring 175 to the leg 170, so that the above-mentioned anti-pushing effect can be achieved.

On the one hand, in order to increase the binding strength against loosening, it is preferable to form a plurality of synthetic resin molded body seating parts 150' and synthetic resin molded body 170.

Furthermore, in this embodiment, the plugging portion 155 of FIG. 2 can be provided simultaneously with the annular ring 175 described above. When the blocking portion 155' is additionally formed at the end of the synthetic resin molded body placement portion 150, the synthetic resin molded body can be more effectively prevented from being pushed away.

Fig. 5 shows a cross-sectional view of a state in which a screw is coupled to a lock nut according to the present invention. When the block-shaped synthetic resin molded body 170 inserted into the synthetic resin molded body seating parts 150, 150' is engaged with the bolt 200, threads of the bolt 200 are forcibly formed on the synthetic resin molded body 170. Therefore, after the screw thread 200 is formed, the thread of the screw screw 200 is in close contact with the synthetic resin molded body 170 to form a strong bond that cannot be unfastened.

Although the embodiments of the present invention have been described above, various modifications can be made by those skilled in the technical field of the present invention.

Claims (4)

1. a locking nut is characterized in that, comprising:

Bolt joining hole (130), it forms spiral chute (110) at inner peripheral surface, combines with bolt,

Molding synthetic resin body arrangement portion (150,150 '), it is formed on the one side that is formed with above-mentioned spiral chute (110),

Molding synthetic resin body (170), it is placed in above-mentioned molding synthetic resin body arrangement portion (150,150 '), when combining with above-mentioned bolt, forces to form helix by the helix of above-mentioned bolt;

Described molding synthetic resin body arrangement portion (150,150 ') forms the groove of specific length along the length direction of described bolt joining hole (130);

At least one end in the two end part of the described length direction of described groove is open towards the outside,

Described molding synthetic resin body arrangement portion (150,150 ') comprises also and prevents to push open equipment that it is used to prevent to push described molding synthetic resin body (170) open along the length direction of described bolt joining hole (130).

2. locking nut according to claim 1 is characterized in that, the described equipment of pushing open that prevents comprises the choking portion (155) that the other end of described molding synthetic resin body arrangement portion (150,150 ') is stopped up along described length direction.

3. locking nut according to claim 1 and 2 is characterized in that, forms a plurality of described molding synthetic resin body arrangement portions (150,150 ') on the one side that is formed with described spiral chute (110);

Settle a plurality of described molding synthetic resin bodies (170) respectively in described molding synthetic resin body arrangement portion (150,150 ');

Describedly prevent to push open equipment and comprise that connecting described a plurality of molding synthetic resin bodies (170) is one, is positioned at the annular ring (175) of the open sides of described molding synthetic resin body arrangement portion (150,150 ').

4. locking nut according to claim 3 is characterized in that, described molding synthetic resin body (170) is by nylon molding.

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