JPS628209Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seatbelt tensioning device that is used in a seatbelt device for protecting an occupant in a vehicle emergency and tensions the seatbelt worn by the occupant in a vehicle emergency.

[Conventional technology and its problems]

A seat belt device is designed to attach a seat belt to an occupant, and in the event of a vehicle emergency, restrain the occupant with the seat belt to prevent the occupant from colliding with a dangerous object. One end of this seatbelt is wound onto a retractor and a certain amount of tension is always applied to it, but the retracting force is considered to be a relatively weak biasing force in order to reduce the feeling of pressure on the occupant. Therefore, there is a slight gap between the seat belt and the occupant, and when a locking device locks the unwinding of the webbing to restrain the occupant in the event of a vehicle collision, the occupant is restrained until this gap is completely eliminated. It has been pointed out that the seat belt is incomplete and the restraining effect of the seat belt cannot be obtained sufficiently.

For this reason, devices have been proposed that tension seatbelts using the explosive power of gunpowder in case of a vehicle emergency, but the use of gunpowder poses a danger, and it is difficult to adjust the explosive power of gunpowder, making it impossible to reuse. It was hot.

The present invention takes the above-mentioned facts into account, and aims to provide a reusable seat belt tensioning device that can reliably tension a seat belt without using explosive power.

[Means for solving problems]

In order to achieve the above object, the present invention includes a seat belt tensioning device that includes a base member, a main shaft that is screwed onto the base member, is rotatably and movably supported, and is biased in the axial direction, and the main shaft. a transmission means for transmitting the rotational and moving force of the shaft as a winding force for tensioning a seat belt; an arm that is pivotally supported by the main shaft and engages with a stopper of the base member to prevent rotation of the main shaft; The apparatus is characterized in that it has an acceleration sensing means that rotates the arm to release the engagement with the stopper in an emergency, thereby enabling rotation of the main shaft.

[Effect]

In such a configuration, in the event of a vehicle emergency, the arm is disengaged from the rotating rest stopper by actuation of the acceleration sensing means. Therefore, the main shaft on which this arm is provided rotates and moves in the axial direction, and the seat belt is wound up and tensioned via the transmission means. In addition, since the seat belt is retracted based on the rotation of the main shaft, a large amount of retraction is possible even in a limited space.
Since the acceleration sensing means only needs to be released from the engagement between the base member and the arm, its operation is easy.
Moreover, malfunctions are prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a seatbelt device 12 to which a seatbelt tensioning device 10 according to the present invention is applied. This seatbelt device 12 is designed so that the occupant 18 seated on the seat 16 is fitted with a three-point seatbelt by means of the seatbelt 14.

One end of the seat belt 14 is wound up by a winding device 22 attached to the middle part of the vehicle side wall 20, and this winding device 22 winds up the seat belt 14 with a predetermined biasing force, and in case of a vehicle emergency, the seat belt 14 is wound up. It has a built-in inertia lock mechanism that instantly stops unwinding. The middle part of the seat belt 14 is folded back at a through ring 24 provided on the upper part of the vehicle side wall 20, and further folded back at a tongue plate 28 that engages with a buckle device 26 that is erected at the approximate center of the vehicle. It is then wound up onto a seat belt tensioning device 10 provided at the lower part of the side wall of the vehicle. Therefore, the occupant can achieve the three-point seat belt system simply by engaging the tongue plate 28 with the buckle device 26.

Seat belt tensioning device 1 as shown in FIG.
0 is provided with a base plate 30, and this base plate 30 is fixed to the side wall of the vehicle with mounting bolts (not shown). An end plate 32 is erected at one end of the base plate 30, and a cylinder 34 whose axis is horizontal is fixed by a bolt 36 approximately in the center thereof. Inlet opening 3 of this cylinder 34
8 is provided with a nut 40 and fixed to the end plate 32 together with the bolt 36. This nut 40 has a male threaded portion 44 of the main shaft 42.
are screwed together. This male threaded portion 44 is a screw having a relatively large pitch and is screwed into the nut 40, and when the main shaft 42 moves in the axial direction, the screwing of this screw causes the main shaft 42 to move while rotating. There is.

There is a collar 46 in the middle of this main shaft 42.
is protruding, and the needle thrust bearing 4
It is adjacent to the disk 50 via 8. A compression coil spring 52 is interposed between the disk 50 and the bottom of the cylinder 34, and the main shaft 42
is adapted to be biased and moved in the axial direction.

The main shaft 42 further extends through the bottom of the cylinder 34 , and its tip is supported by a pivot hole 56 of an end plate 54 erected from the end of the base plate 30 . A spline 58 is carved in the main shaft 42 between the shaft support hole 56 and the bottom of the cylinder 34.
It meshes with a spline carved on the inner periphery of the take-up reel 60 to constitute a transmission means. An end portion of the seat belt 14 is fixed to the take-up reel 60 and wound up in layers. Therefore, take-up reel 6
0 and the main shaft 42 can move relative to each other in the axial direction, but when the spline 58 rotates, the reel 60 also rotates together with it.

On the other hand, the main shaft 4 protruding from the nut 40
A set lever 62 is fixed to the tip of 2 and rotates together with the main shaft 42. An arm 6 is attached to the tip of the set lever 62.
4 is pivotally supported by a pin 66 and the set lever 62
It is possible to rotate relative to the This arm 64 is inserted into a rectangular groove 68 carved in the end plate 32, and comes into contact with a side wall 70 of the rectangular groove forming a stopper, transmitting the rotational force of the main shaft 42 to the end plate 32, and thereby rotating the main shaft 42. It prevents the rotation of. However, when the arm 64 is rotated counterclockwise in FIG. 2 about the pin 66, the engagement between the arm 64 and the side wall 70 is released, so the arm 64 allows the main shaft 42 to rotate. It's becoming like that. Note that the rectangular groove 68
On the outer periphery of the end plate 32 adjacent to the third
As shown in the figure, a triangular notch 72 is formed so that when the arm 64 rotates by a small angle around the pin 66, the engagement between the arm 64 and the side wall 70 is released.

The tip of this arm 64 is attached to the end plate 32.
It protrudes to the opposite side and is placed on the protrusion 76 of the push-up lever 74. This push-up lever 74 is connected to a bracket 78 screwed onto the end plate 32.
It is supported by a shaft.

Further, a force receiving protrusion 80 protruding below the push-up lever 74 is connected to a pendulum 82 suspended from the bracket 78.
is placed on the head 84 of. This pendulum 82 constitutes an acceleration sensor, and swings when the vehicle acceleration reaches a predetermined value, tilting the push-up lever 74, transmitting this push-up force to the arm 64, and rotating the arm 64 around the pin 66. It is now possible to move it.

In FIG. 2, a bracket 86 is fixed near the bottom of the cylinder 34 to prevent deformation of the cylinder, and inside this cylinder, a buffer pad 88 is fixed to the back surface of the nut 40 and the collar 46 is fixed. It is designed to reduce the impact of

To explain the operation of this embodiment configured in this way, the occupant can attach a three-point seatbelt by engaging the tongue plate 28 with the buckle device 26 after sitting on the seat 16 as shown in FIG. can become a state. Furthermore, since the retractor 22 allows the seat belt 14 to be unwound in the normal running state of the vehicle, the driving position can be changed arbitrarily.

If the vehicle is in an emergency situation such as a collision, the inertia lock mechanism in the retractor 22 is activated to abruptly stop the unwinding of the seatbelt 14, so that the occupant is restrained by the seatbelt 14. Safety can be ensured. Furthermore, in this emergency state, the pendulum 82 of the seat belt tensioning device 10 shown in FIG. This allows the set lever 62 to rotate together with the main shaft 42, and the biasing force of the compression coil spring 52 causes the male threaded portion 44 of the main shaft 42 to rotate while being pushed out from the nut 40. This rotational force of the main shaft 42 is transmitted to the take-up reel 60 via the spline 58,
Since the end of the seat belt 14 is wound onto the take-up reel 60, the tension of the seat belt 14 increases. As a result, the tension on the seat belt attached to the occupant is stronger than that in the normal driving state of the vehicle, so that after the gap between the seat belt and the occupant is eliminated, the seat belt becomes restrained, further improving safety.

The main shaft 42 moves in the axial direction while rotating, and the amount of axial movement is determined by the spline 58.
This is absorbed by the relative movement in the axial direction between the take-up reel 60 and the take-up reel 60, and the take-up reel 60 will not suffer from any malfunction.

Furthermore, when the emergency state of the vehicle is released and when assembling the seat belt tensioning device 10, the passenger or worker screws the main shaft 42 into the nut 40 while rotating the set lever 62, and then tightens the arm at the tip of the set lever 62. 64 to rectangular groove 6
8, it can be easily set.

In the above embodiment, the seat belt tensioning device can also be incorporated into the take-up device 22 by interposing a clutch mechanism between the main shaft 42 and the take-up reel 60 to be connected in case of a vehicle emergency. Further, a retaining mechanism such as a leaf spring may be provided between the arm 64 of the set lever 62 and the rectangular groove 68 to prevent the arm 64 from accidentally falling off from the rectangular groove 68.

Next, FIG. 4 shows the main shaft detent mechanism. Main shaft 42 collar 46
A tapered portion 100 is formed on its outer periphery.
This tapered portion 100 is located at the bottom of the cylinder 34 (the fourth
The diameter becomes gradually smaller toward the right side in the figure, and a synthetic resin cap 102 is placed around the outer periphery of this collar 46. A ring-shaped projection 104 projects from the outer circumference of the cap 102 and comes into contact with the inner circumference of the cylinder 34. The other configurations are the same as those of the first embodiment.

Therefore, in this second embodiment, when the main shaft 42 receives a force that tends to move toward the bottom of the cylinder, the tapered portion 100 of the collar 46 acts to press the synthetic resin cap 102 toward the inner surface of the cylinder. In order to do this, the protrusion 104 is strongly pressed against the inner circumferential surface of the cylinder to prevent the main shaft 42 from rotating in reverse or to increase frictional resistance. As a result, after the main shaft rotates and applies tension to the seat belt, care is taken to ensure that the tension does not relax or that the tension is relaxed slowly.

Note that the acceleration sensing means is not limited to the pendulum described above, but may also be a combination of a G switch and a solenoid.

[Effect of idea]

According to the present invention, the arm is engaged with the stopper of the base member to prevent rotation of the main shaft, and in the event of a vehicle emergency, the arm is disengaged from the stopper by actuation of the acceleration sensing means and the main shaft is stopped. The main shaft rotates and moves in the axial direction, and the rotational and moving force of the main shaft is transmitted as the winding force that tensions the seatbelt.Therefore, there is no need to use the explosive force of gunpowder, etc., as in conventional systems, making it easy to use. With this configuration, the seat belt can be reliably tightened in the event of a vehicle emergency, and the device can be used repeatedly. Furthermore, since the seat belt is wound up based on the rotation of the main shaft, a large amount of retraction is possible even in a limited space, and the device can be made more compact. In addition, since the acceleration sensing means only needs to be disengaged from the base member and the arm in the event of a vehicle emergency, it is easy to operate and does not cause malfunctions.
Tensioning by winding up the seat belt can be performed reliably.

[Brief explanation of the drawing]

FIG. 1 is a front view of a seatbelt device to which a first embodiment of the seatbelt tensioning device according to the present invention is applied, FIG. 2 is a sectional view showing the seatbelt tensioning device, and FIG. 3 is a line taken along the line shown in FIG. The sectional view and FIG. 4 are front views showing a state in which a main shaft and a through ring are connected according to a second embodiment of the present invention. 10... Seat belt tension device, 12... Seat belt device, 14... Seat belt, 30...
Base plate, 34... Cylinder, 40... Nut, 42... Main shaft, 44... Male thread, 52... Compression coil spring, 58... Spline, 60... Take-up reel, 62... Set lever, 64...arm, 66...pin, 70...side wall, 82...pendulum.

Claims (1)

[Scope of utility model registration request] A base member, a main shaft that is screwed onto the base member, is rotatably and movably supported, and is biased in the axial direction, and the rotational and moving force of the main shaft is transmitted as a winding force that tensions the seat belt. an arm that is pivotally supported by the main shaft and engages with a stopper of the base member to prevent rotation of the main shaft; and in a vehicle emergency, the arm is rotated to release the engagement with the stopper. and acceleration sensing means for enabling rotation of the main shaft.