JPH07251708A - Seat belt tightening device - Google Patents

Abstract

PURPOSE:To make the structure of an entire device simple and compact and enable its reset. CONSTITUTION:A reversing prevention hook plate 33 extending from a sat belt buckle 34 is installed on a buckle plate 32 so as to move lineally and freely and when an inertia force is exerted on a mass body in draw-in part casing 11, the mass body is moved by a spring energizing force after escaping from its restricted state. The reversing prevention hook plate 33 connected to the mass body by a wire 17 is drawn-in and moved in accordance with the movement of the mass body. A pair of reversing prevention claws 36A, 36B installed on the buckle plate 32 obstruct the movement of the reversing prevention hook plate 33 to the draw in direction in their engaging state. A reversing prevention claw holding plate for selecting and setting the engagement and disengagement with and from the reversing prevention claws 36A, 36B is installed and when the engagement of the reversing prevention claws 36A, 36B is released and a mass body is returned to its original position against the spring energizing force by the reversing prevention claw plate 33 through a wire 17, the mass body comes in its restricted state again by a retainer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening device for tightening a seat belt when a vehicle is suddenly decelerated, and more particularly to a tightening device which has a compact structure and can be reset and reused.

[0002]

2. Description of the Related Art A seat belt tightening device is intended to protect a passenger's body in combination with the locking of a retractor by rapidly tightening a seat belt to eliminate the looseness of the seat belt. There are various proposals for retracting a seat belt buckle or the like by the spring force of the. For example, JP-A-5-193443 (first
Conventional example), JP-A-4-317839 (second conventional example), JP-A-4-63746 (third conventional example), and JP-A-5-42013 (fourth conventional example).

[0003]

By the way, a seat belt tightening device usually has a retracting portion provided with a coil spring,
And a reverse movement preventing portion that prevents the seat belt buckle from being pulled out when the occupant moves. Here, in each of the above-mentioned first conventional example and the second conventional example, a backward movement preventing portion for preventing the seat belt buckle from being pulled out by meshing with saw teeth is shown. No structure is suggested for retrieving and reusing the freeloader device. Further, the third conventional example does not show details of the reverse movement preventing portion. In the fourth conventional example, a reset mechanism for reusing the seat belt tightening device is shown, but this mechanism has a relatively complicated structure at a position close to the seat back completely apart from the installation position of the coil spring. It is provided so that it can be interlocked with the seat back. However, this is disadvantageous in terms of installation space, and the operation is complicated because the seat back needs to be tilted each time it is reset.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a seat belt tightening device capable of simplifying and compacting the structure of the entire device and resetting the seat belt.

[0005]

According to the structure of claim 1, a suspension member 34 for suspending a seat belt, a support member 33 for supporting the suspension member 34, and a holder for linearly movably holding the support member 33. The member 32 and the retracting member 14 that is rapidly moved when an inertial force of a predetermined amount or more is applied.
A connecting member 17 that connects the pull-in member 14 to the support member 33 and moves the support member 33 in the pull-in direction as the pull-in member 14 moves; and the holding member 32 that is engageable with the support member 33. Is provided on the movable support member 33 in the engaged state to prevent the support member 33 from moving at least in the pull-out direction, and the engagement selection for selectively setting the engagement of the movement restricting members 36A and 36B and its cancellation. It has a member 40 and a reset member 18 which brings the pulling member 14 into the restrained state again when the pulling member 14 is returned to the original position against the spring biasing force by the support member 33 via the connecting member 17. According to the configuration of claim 2, the support member 33 is configured by an elongated plate body having a large number of sawtooth-shaped hook portions 332 formed in the longitudinal direction, and the movement restricting members 36A and 36B are attached to the hook portions 332. The plate body 362 is formed with a saw-toothed claw portion 364 to be fitted, and the claw portion 364 of the plate body 362 has the claw portion 3
A spring member 38 is provided for urging the spring member 32 in the direction of engaging with it.
According to the structure of claim 3, an elongated hole 331 that extends in the longitudinal direction is formed in the center of the elongated plate that constitutes the support member 33, and the hook portions 3 are formed at both parallel side edges of the elongated hole 331.
The plate member 362 which forms 32 and constitutes the movement restricting members 36 </ b> A and 36 </ b> B is provided with the hook portions 33 on both sides in the elongated hole 331.
Two pairs are provided facing each other. According to the structure of claim 4, the pair of plate members 362 forming the movement restricting members 36A and 36B are rotatably supported on the common shaft member 37 provided on the holding member 32 at each end on the same plane. Then, the plate members 362 are urged by the spring member 38 so as to open in an octagonal shape, and the claw portions 364 formed on the distal end side edges of the plate members 362 are engaged with the hook portions 332 facing each other. Make so that they fit together. According to the configuration of claim 5, in the engagement selection member 40, the plate member 362 is moved to a position where the engagement of the plate member 362 with the hook portion 332 is canceled by deforming the spring member 38 against the biasing force thereof. When the spring member 38 is pressed,
A locking portion 401 that locks the slab in its deformed posture is provided. According to the structure of claim 6, the movement restricting members 36A, 36B
In the range where the claw portions 364 of the above are engaged, the regulation walls 402 are provided to abut on both side edges of the elongated hole 331 formed with the hook portion 332 from the outside to regulate the deformation thereof. According to the structure of claim 7, the holding member 32 is rotatably connected to the base body 21 at the base end, and the connection point 213 with the base body 21 and the suspension member 3 are provided.
4 is a connecting point 341 at the tip of the supporting member 33,
The shaft member 37 and the shaft member 37 are arranged on the same straight line. According to the structure of claim 8, the suspension member 34 for suspending the seat belt.
A supporting member 33 for supporting the suspension member 34, a holding member 32 for linearly moving the supporting member 33, and a retracting member 14 that is rapidly moved by a spring biasing force when an inertial force of a predetermined amount or more acts. And the retracting member 1
4 is connected to the support member 33 and is provided on the holding member 32 so as to be engageable with the support member 33 and a connecting member 17 that moves the support member 33 in the retracting direction with the movement of the retracting member 14. The support member 33 in the engaged state
Has movement restricting members 36A and 36B that prevent movement of the moving restricting members 36A and 36B at least in the pull-out direction, and an engagement release preventing member 41 that prevents disengagement of the movement restricting members 36A and 36B. According to the structure of claim 9, the disengagement prevention member 41 is set to maintain the blocked state even when a force is applied from the suspension member 34 side, and release the blocked state by the retracting force from the retracting member 14 side. Has been done. According to the structure of claim 10, a suspension member 34 for suspending the seat belt, a support member 33 for supporting the suspension member 34, a holding member for linearly holding the support member 33 and fixed to the seat S. 32, a retracting member 14 that is rapidly moved by a spring biasing force when an inertial force of a predetermined amount or more is applied, the retracting member 14 is connected to the supporting member 33, and the supporting member 33 is moved as the retracting member 14 moves. And a holding member 32 that is engageable with the support member 33 and that prevents the support member 33 from moving at least in the pull-out direction in the engaged state. It has 36A and 36B.
According to the structure of claim 11, the support of the holding member 32 to the sheet S is common to the support portion 37 of the movement restricting members 36A and 36B to the holding member 32.

[0006]

In the structure of claim 1, when the retracting member 14 is moved by the action of the inertial force, the supporting member 33 is moved in the retracting direction via the connecting member 17. The moved support member 33 is engaged with the support member 33 by a movement restricting member 36.
At least the movement in the pull-out direction is blocked by A and 36B, and the seat belt suspension member 34 is not pulled out again even if the load of the occupant is applied. When the device is reset, when the engagement of the movement restricting members 36A and 36B is released by the engagement selecting member 40, the supporting member 33 can be freely pulled out, and the supporting member 33 is pulled out and the connecting member 17 is inserted. When the retracting member 14 is returned to the original position by pressing, the retracting member 14 is again restrained and the device is reset. Thus, the device can be reset by a simple operation of pulling up the support member 33 that supports the seat belt suspension member 34.

According to the second aspect of the present invention, since the serrated hook portion 332 and the claw portion 364 are urged and engaged by the spring member 38, the hook portion 332 and the claw portion 364 are inclined with respect to each other even in the engaged state. It can be overridden and the support member 33 is free to move in the retracting direction. In the pull-out direction, the hooks 332 and the claws 364 are engaged with each other by their vertical surfaces, and their movement is blocked.

In the structure of claim 3, the pair of plate members 3
Since the movement of the support member 33 is restricted by 62, each plate member 36
The load applied to 2 can be reduced, which is advantageous for securing strength.

In the structure of claim 4, the pair of plate members 3
Since 62 is rotatably provided around the common shaft member 37, it becomes compact, and since it rotates on the same plane, no moment force is generated.

According to the fifth aspect of the invention, the support member 33 can be easily pulled out again by locking the spring member 38 to the locking portion 401 in the deformed posture.

In the structure of claim 6, since the restriction wall 402 is provided, the support member 33 is not deformed even when a large load is applied to the support member 33 with the claw portion 364 and the hook portion 332 engaged with each other. To be prevented.

In the configuration of claim 7, each connecting point 21
Since 3,341 and the shaft member 37 are arranged on the same straight line, no moment force is generated when a load is applied, which is advantageous in terms of strength and the device can be made compact.

According to the eighth and ninth aspects of the invention, if the engagement canceling member 41 prevents the claw 364 and the hook 332 from disengaging, the support member 33 is also prevented from moving in the retracting direction. The buckle position does not move when the tongue plate is inserted into the seat belt buckle or the like as the seat belt suspension member 34.

In the structure of claim 10, the holding member 3
Since 32 is fixed to the seat S, the distance between the seat belt suspension member 34 and the fixing position of the apparatus can be made sufficiently small, which is advantageous in strength. Further, in the structure of the eleventh aspect, the fixing of each component of the reverse movement preventing portion and the fixing of the device are performed at the same time, and the labor of assembling is reduced.

[0015]

[Embodiment 1] (Structure and operation of the retracting portion of the tightening device) In FIG. 1, the casing 11 of the retracting portion is a metal cylindrical body, which is fixed on a vehicle floor (not shown) and extends in the front-rear direction (left-right direction in the drawing). It is arranged. The vent hole 20 is at the front end (left end in the figure) of the opening.
It is closed by a cap 20 provided with 1, and a tubular main body portion 211 of a housing member 21 is press-fitted and fixed in the rear end opening. As shown in FIG. 2, the main body portion 211 is configured by abutting a pair of semi-cylindrical bodies 211A and 211B that are divided into two along the axis, and one of the semi-cylindrical bodies 211A has a rectangular shape protruding outside the casing 11. The connecting portion 212 of is formed.

In FIG. 1, a main spring guide member 14 serving as a front mass body and a holder 15 serving as a rear mass body are disposed in front and rear positions inside the closed casing 11. As shown in FIGS. 3 and 4, the main spring guide member 14 is a metal cylindrical body having a through hole 142 having a large diameter in the first half and a small diameter in the latter half, and a flange-shaped spring locking portion 141 formed on the outer periphery has upper and lower two. Rectangular groove 14 extending in the axial direction at a location
3 is formed, and a leaf spring 16 as a restricting member whose facing interval gradually expands rearward is provided here. That is, the leaf spring 16 is formed by bending a strip plate into a substantially U shape, and the base end portion thereof is, as shown in FIG. 5, the main spring guide member 1.
The flange plate 162 conforms to the end surface shape of No. 4.
Both leg portions 163 and 164 of the leaf spring 16 extend rearward through the upper and lower grooves 143 of the main spring guide member 14, and stopper pieces 165 are caulked and fixed to each tip 161.

In FIG. 1, a holder 15 is a large-diameter metal cylindrical body capable of accommodating the latter half of the main spring guide member 14, and a flange-shaped spring locking portion 1 is formed around the entire rear end outer circumference.
51 is formed to project. A metal ring 152 is fitted to the spring locking portion 151 along the peripheral edge of the opening, and the end surface of the stopper piece 165 of the leaf spring tip 161 inserted through the holder 15 is in contact therewith. Such holder 15
Has a front end abutting a receiving ring 22 mounted on the outer periphery of the main spring guide member 14, and a rear end thereof is the housing member 21.
Is in contact with the end surface of. The receiving ring 22 is shown in FIG.
As shown in (1), the leaf spring 16 is inserted into the cylinder, and protrusions 221 for pushing into the cylinder formed at two locations (FIG. 1) on the peripheral wall of the leaf spring 16 are formed on the outer periphery of the main spring guide member 14 in a locking groove. It is fixed by engaging with 144. Receiving ring 2
After mounting 2, the plate spring 16 is further inserted into the holder 15 (FIG. 6 (2)), and the spring locking portion 1 of the holder 15 is inserted.
A main coil spring 12 as a main spring member is sandwiched and arranged between 51 and the spring locking portion 141 of the main spring guide member 14 in a contracted state. The strong extension spring force of the main coil spring 12 is received by the flange plate 162 of the leaf spring 16 and the stopper piece 165 that are in contact with the end faces of the spring locking portions 141 and 151.

In FIG. 1, both ends 1 of the leaf spring 16 are
The outer peripheral surface 18a of the block-shaped retainer 18 as a reset member is in contact with 61 from the inside, and the retainer 18 is slidably disposed in the inner space of the housing member 21 in the front-rear direction. It is biased forward by a coil spring 23 arranged between the inner wall of the rear end. A wire 17 as a connecting member extends forward through a through hole 181 provided in the center of the retainer 18, one end of the wire 17 reaches a backward movement preventing portion (not shown) which will be described later, and the other end of the wire 17 has a main spring guide member 14 It is fixed to the central protrusion of a circular locking plate 171 which is located at a predetermined interval in front of the inside of the cylinder. In order to smoothly insert the wire 17, the peripheral walls of the main spring guide member 14 and the holder 15 are partially separated as shown in FIG. 5, and the wire 17 is laterally passed through the separation gaps 145 and 153. Can be easily inserted into the cylinder. Between the central projection end surface of the locking plate 171 and the inner peripheral stepped surface of the main spring guide member 14, a sub coil spring 13 having a weak spring force is disposed as a sub spring member (FIG. 1), and the leaf spring 16 The front and rear main spring guide members 14 and the holder 15 which are integrated by the above are supported forward.

A positioning member 19 is attached to an intermediate position of the wire 17, and a distal end curved portion of a flexible claw 191 extending rearward from the vertical position thereof is retained by the retainer 18.
Is locked to the stepped surface of the through hole 181. Due to the dust, the locking plate 171 at the tip of the wire 17 is positioned at a predetermined position.

When a forward inertial force acts on the main spring guide member 14 and the holder 15 due to sudden deceleration of the vehicle or the like in the pull-in portion having such a structure, as shown in FIG. 7, the auxiliary coil spring 13 is compressed and both are moved forward. By moving, the inner side surface of the leaf spring tip 161 is disengaged from the outer peripheral surface 18a of the retainer 18. A moment in the direction of the arrow in the figure acts on the stopper piece 165 due to the load from the main coil spring 12,
As a result, as shown in FIG. 8, the leaf spring tip 161 is bent and inclined inward, so that the end surface of the stopper piece 165 and the metal ring 15 are bent.
The engagement of 2 is released. Then, the main coil spring 12 is expanded and deformed by a large spring force (FIG. 9), and accordingly, the main spring guide member 14 abuts on the locking plate 171, and pushes it forward rapidly. At the same time, the wire 17 is also pulled forward with a large force, and the seat belt buckle described later is pulled in. If the bending inclination amount of the leaf spring tip 161 is set large, the stopper piece 165 and the metal ring 15 are
Even when the friction coefficient of 2 is large (for example, one is iron and the other is aluminum), the engagement state can be released smoothly, and the selection range of the material is widened. Further, in order to make the disengagement smoother, the stopper 165 or the corner of the metal ring 152 may be tapered.

By properly setting the spring force of the sub coil spring 13, the inertial force at which the main spring guide member 14 and the like start moving can be determined, and not only when the vehicle is suddenly decelerated, but also when riding on a step or on a bad road. The retracting operation can be performed even when the vehicle is running. Further, by adjusting the overlap amount between the rear end portion of the stopper piece 165 and the front end portion of the retainer 18 shown by δ in FIG. 1, it is possible to appropriately set the duration of the deceleration inertial force for the pulling operation.

When the retracting portion after the operation is reset to the initial state, the wire 17 is pulled rearward so that the rear end of the stopper piece 165 is brought into contact with the front end of the retainer 18 (FIG. 10). The retainer 18 whose back is supported by the coil spring 23 retreats in accordance with the retreat of the stopper piece 165 (arrow in the figure), and the tip 16 of the leaf spring 16 urged outward.
1 enters the space behind the spring locking portion 151 of the holder 15, and the end surface of the stopper piece 165 abuts and engages with the metal ring 152 (arrow in FIG. 11). In this state, the retainer 18 advances again as indicated by the arrow in the figure, and the outer peripheral surface 18a of the retainer 18 comes into contact with the leaf spring tip 161 from inside to prevent the stopper piece 165 from coming off the holder 15. Thus, the retracting part is returned to the state before the operation.

(Structure and Operation of the Reverse Tightening Device of the Tightening Device) FIG.
In FIG. 2, the fixed cover 31 of the reverse movement preventing portion has a flat rectangular tubular shape, and the narrow lower end portion 3 of the buckle plate 32 that is a supporting member that projects obliquely downward from the lower end of the cover 31.
21 is rotatably connected by a shaft member 213 to a connecting portion 212 that projects rearward from the casing 11 of the retracting portion. The main body of the buckle plate 32 has a wide plate shape (FIG. 13) and is located along the inner wall of the fixed cover 31.

A reverse movement preventing hook plate 33, which is a supporting member having a width slightly smaller than that of the buckle plate 32, is slidably arranged in contact with the plate surface of the buckle plate 32. The reverse movement preventing hook plate 33 is an elongated plate extending in the extension direction of the buckle plate 32, and an elongated hole 331 extending in the longitudinal direction is provided at the center of the plate surface.
A large number of hook portions 33 having a sawtooth shape on both side surfaces of 31 which face each other in parallel.
2 is formed. The upper end 33 of this reverse movement preventing hook plate 33
A seatbelt buckle 34, which is a seatbelt suspension member, is fixed to 6, and the entire reverse movement preventing hook plate 33 except the seatbelt buckle 34 is housed in a movable cover 35 (FIG. 12). The movable cover 35 has a flat rectangular tubular shape, and is entirely formed in a bellows shape so as to be expandable and contractible. The upper end opening is fixed to the seat belt buckle 34, and the lower end opening is engaged with the peripheral wall of the fixed cover 31. Stop groove 311
It is locked inside.

A pair of left and right reverse movement preventing pawls 36A, 36B, which are movement restricting members, are provided in the elongated holes 331 of the reverse movement preventing hook plate 33.
The reverse movement preventing claws 36A and 36B are press-formed products of a plate material, are symmetrical with each other, and are composed of a ring-shaped head portion 361 at one end and leg portions 362 extending therefrom. Head portion 361 of one reverse movement preventing pawl 36A
As shown in FIG. 14, there is a step difference with respect to the head 361 of the other one, and in the state where these heads 361 are overlapped, each leg 362 is located on the same plane. This prevents the moment force from being applied when the reverse-traveling hook plate 33 described later is engaged with the hook portion. Each reverse movement preventing pawl 36A, 36
The overlapping head portion 361 of B is fitted into the cylindrical shaft member 37 inserted into the mounting hole 322 (FIG. 13) of the buckle plate 32, and is rotatable around the shaft member 37. A long hole 363 is provided along the inner edge at the tip of each leg 362 of the reverse movement preventing pawls 36A and 36B, and the tips of both legs of a leaf spring 38 bent and bent in an inverted U shape are inserted into these long holes 363. There is. That is, the tip ends of both leg portions of the leaf spring 38 extend slenderly in the orthogonal direction, and one end of the extending portion 381 has the elongated holes 363.
Inserted inside. Then, the long hole 3 of the reverse-traveling hook plate 33
In the state of FIG. 12 located inside 31, the left and right reverse movement preventing claws 3
6A and 36B are connected to each other by the leaf spring 38 so that the leg portions 362
(FIG. 14) is biased so as to separate from each other, and a plurality of sawtooth-shaped claw portions 3 are formed on the outer surface of each leg portion 362 that is opened in an eight shape.
64 engages with the hook portion 332 of the reverse movement preventing hook plate 33 to prevent the upward movement thereof.

In FIG. 13, the other end of the extending portion 381 at the tip of the leaf spring 38 is connected to the leaf spring 38 and the reverse movement preventing claw 3.
6A, 36B is passed through the opening 391 of the movable plate 39, and inside the upper wide portion of the T-shaped opening 401 as the locking portion formed in the reverse movement preventing claw pressing member 40 serving as the engagement selection member. Has arrived. The movable plate 39 can be moved within a certain range in the vertical direction within the reverse movement preventing pawl pressing member 40, and the opening 391 thereof is slightly larger than the outer shape of the plate spring 38.
Legs 392 project downward from the left and right positions of the lower end.
The reverse movement preventing claw pressing member 40 is a plate body having both side edges bent at a right angle to form a regulation wall 402, and is located so as to cover the movable plate 39. The left and right regulation walls 402 are the reverse movement preventing hook plates 33.
The outer wall of the reinforcing wall 333, which is erected on both side edges, is prevented from being deformed outward. Reverse-travel prevention claw retainer 4
0 is a notch 403 formed at the lower end of the left and right restriction walls 402
Are fitted into the rectangular protrusions 323 formed on the left and right side edges of the buckle plate 32. Reverse-travel prevention claw pressing member 40
In the mounting hole 404 provided on the plate surface of the
The shaft member 37 that penetrates through the overlapping head portion 361 of 36B is inserted, and the cylindrical wall of the shaft member 37 is expanded and deformed at the insertion end to fasten the reverse movement preventing pawl pressing member 40 to the buckle plate 32. ing.

In FIG. 12, the rectangular head portion 411 of the leaf spring 41, which is a disengagement preventing member, is inserted between the left and right backward movement preventing pawls 36A, 36B, and the backward movement preventing pawls 36A, 36B are inserted. It blocks the inward movement of 36B. Therefore, in this state, the reverse movement preventing pawls 36A, 36
B does not come off from the hook portion 332 of the reverse movement preventing hook plate 33, and the backward movement preventing hook plate 33 (that is, the seat belt buckle 34) is prevented from moving not only upward but also downward. The upper edge of the head portion 411 is bent toward the buckle plate 32 in a substantially U-shaped cross section (FIG. 13) to increase the strength of the head portion 411 in the width direction and a reverse movement preventing claw 36A described later. , 36B is available. The leaf spring 41 has a connecting portion 412 from the head portion 411.
Has leg portions 413 opened in an eight-shape through
The tip of 3 is inserted into the mounting hole 335 of the stopper wall 334 which is formed in a bent shape at the lower end of the reverse movement preventing hook plate 33. The block-shaped end portion 172 of the wire 17 extending from the lead-in portion casing 11 through the flexible tube 42 is fixed to the connecting portion 412 of the leaf spring 41.

At the boundary position between the main body portion and the lower end portion of the buckle plate 32, both side edges of the plate material are extended forward and bent to form a holding piece 324, and the holding piece 324 makes one end of the flexible tube 42. While being held and fixed, the lower surface protrusions 431 of the rectangular rubber stoppers 43 are fitted and fixed in the spaces of the left and right holding pieces 324, respectively.

When the wire 17 is pulled in the pull-in portion in the above-described stroke, the wire 17 moves downward in the reverse movement preventing portion, and the block-shaped end 172 of the wire 17 moves to the lower end stopper of the reverse movement preventing hook plate 33. Abut the wall 334. At the same time, the leg portion 413 of the leaf spring 41 is deformed downward, so that the head portion 411 of the leaf spring 41 slips out from between the left and right backward movement preventing pawls 36A and 36B, and the backward movement preventing pawls 36A and 36B can be moved inward. Becomes Then, when the backward movement preventing hook plate 33 is pulled by the wire 17 and moves downward, the backward movement preventing claw 36A,
36B is freely displaced inward so as to get over the hook portion 332 as it passes through the hook portion 332 (FIG. 15), and the reverse movement preventing hook plate 33 is provided.
Moves rapidly downward (arrow in the figure) to retract the seat belt buckle 34. The movement of the reverse movement preventing hook plate 33 is stopped by the stopper wall 334 thereof coming into contact with the rubber stopper 43 provided on the buckle plate 32. The presence of the rubber stopper 43 reduces the impact at the time of contact. After the pull-in is completed, an upward pulling load acts on the reverse-prevention hook plate 33 through the seat belt buckle 34 due to the forward movement of the occupant.
A and 36B engage with the hook portion 332 to prevent the backward movement preventing hook plate 33 from being pulled out. At this time, the outward bending deformation force acts on both side edges of the reverse movement preventing hook plate 33 along the elongated hole 331 formed with the hook portion 332, but the backward movement preventing pawl pressing member 40 (FIG. 13) is restricted. Deformation is restricted by the wall 402.

When the retracting portion is to be reset, the lower end opening of the movable cover 35 is unlocked and pulled up to open the opening 401 (FIG. 1) of the reverse movement preventing claw pressing member 40.
3) The extended portions 381 at the tips of both legs of the leaf spring 38 protruding from the upper wide portion are grasped by a tool or the like and moved into the lower narrow portion of the opening 401 against the spring biasing force. As a result, the left and right reverse-prevention claws 36A and 36B are displaced to the inner position where they do not interfere with the hook portion 332 of the reverse-prevention hook plate 33 (Fig. 16), and in this state, the seat belt buckle 34 and the reverse belt When the anti-advancement hook plate 33 is pulled up (arrow in the figure), the wire 17 also moves accordingly, and the wire 17 moves rearward in the retracting portion, so that the retracting portion is reset by the above-described process.

The leaf spring 41, which moves integrally with the backward movement preventing hook plate 33 as it moves upward, is provided with the backward movement preventing pawls 36A and 36B.
As shown in FIG. 17, the upper end edge of the head portion 411 that bends when reaching the upper end rides on the lower end surface of the leg portion 362 of the reverse movement preventing claws 36A and 36B. When the reverse movement preventing hook plate 33 further rises and reaches the vicinity of the original position, the tips of both legs 392 of the movable plate 39 come into contact with the stopper wall 334 (FIG. 13) and move upward, and the opening lower end edge 393 is Leg spring extension 38 of leaf spring 38
1 and abutting against it, the opening 40 of the reverse movement preventing claw pressing member 40
Push to the upper wide part of 1. As a result, the leaf spring 38 returns to its original shape, and the left and right reverse-prevention claws 36A and 36B are displaced outward and engage with the hook portion 332 of the reverse-prevention hook plate 33. At the same time, between the reverse prevention pawls 36A and 36B opened to the left and right,
The head portion 411 of the leaf spring 41 is fitted again by its own spring force to prevent the inward displacement (FIG. 18). Thus, the reverse movement preventing hook plate 33 and the seat belt buckle 34 return to the initial state in which the vertical movements thereof are both restricted.

It should be noted that the upper end of the reverse-prevention hook plate 33 without the reinforcing wall 333 and the lower end 321 of the buckle plate 32 having a narrow width are easier to move in the direction orthogonal to the plate surface than other parts. Since the seat belt is bent, the shape of the seat belt fits well with the occupant's body when the seat belt is tightened. This curved portion extends from the lower end of the buckle plate 32 to the seat belt buckle 3
4 may be provided at least at one place, and for reinforcement of the portion other than the curved portion, ribs or the like may be formed instead of using the reinforcing wall 333.

In the present embodiment, as shown in FIG. 12, a connecting point 336 between the reverse-movement preventing hook plate 33 and the seat belt buckle 34, a shaft member 37, and a connecting portion 212 between the buckle plate 32 and the housing member 21 which is a base. Connection point 2
Since 13 are arranged on the same straight line, a moment force is not generated with respect to a load input from this straight line direction, and sufficient strength is exhibited.

The wire 17 extending from the retracting portion to the reverse movement preventing portion may be suspended on a pulley or the like instead of being passed through the flexible tube 42.

By appropriately setting the strength of the restriction wall 402 of the reverse movement preventing pawl pressing member 40, when an excessive load such as the seat belt is stretched, the restriction wall 402 and the inside thereof are controlled as shown in FIG. The side edge of the elongated hole of the reverse movement preventing hook plate 33 is deformed outward, and the seat belt tightening device cannot be reused.

[0036]

[Embodiment 2] As shown in FIG. 20, a rectangular engagement plate 414 is projected from the left and right positions of the connecting portion 412 on the leaf spring 41 serving as an engagement release prevention member, and these engagement plates 414 are supported by a support member. Opening 3 formed in the plate surface of the barrel reverse prevention hook plate 33
Each of them is inserted into 36 and brought into contact with the back surface. According to this structure, even if a load acts in a direction that causes the leaf spring 41, the leaf spring 41 is held along the plate surface of the reverse-movement preventing hook plate 33 without being separated therefrom.

[0037]

[Third Embodiment] As shown in FIG. 21, in order to urge the left and right reverse-prevention claws 36A and 36B to open in the engaging direction, a reverse U-shape is formed between the legs 362 of the reverse-prevention claws 36A and 36B. The leaf springs 44 may be inserted to urge the leg portions 362 outward.

[0038]

Fourth Embodiment Further, as shown in FIG. 22, the reverse movement preventing claw 3
The coil spring 45 may be inserted between both leg portions 362 of 6A and 36B to urge these leg portions 362 outward.

[0039]

[Fifth Embodiment] The head 4 of the leaf spring 41 serving as an engagement release preventing member.
23 is formed in a T-shape as shown in FIG. 23, the end faces of the head 411 are brought into contact with the tip surfaces of the leg portions 362 of the reverse movement preventing pawls 36A and 36B, and the inward movement of the leg portions 362 is prevented. It is also possible to adopt a structure that prevents the engagement state from being released.

[0040]

[Sixth Embodiment] Each leg 362 of the reverse movement preventing claws 36A and 36B
As a structure for rotating the same on the same plane, as shown in FIG. 24, a structure in which the leg portion 362 of the one reverse movement preventing pawl 36A is stepwise thicker than the head portion 361 can be adopted.

[0041]

[Embodiment 7] Also, as shown in FIG. 25, the head 361 of one reverse movement preventing pawl 36A may be shaped like a truncated ring along the outer circumference of the head 361 of the other reverse movement preventing pawl 36B. Has the effect of.

[0042]

[Embodiment 8] Further, as shown in FIG.
The heads 361 of 6A and 36B may be curved in an arc shape, and the shaft member 37 may be provided on the inner peripheral surfaces of these heads 361 and the truncated ring 365 may be provided on the outer peripheral surface thereof.

[0043]

[Embodiment 9] To install a seat belt tightening device,
The casing 11 of the retracting portion as in the first embodiment.
27 may be fixed to the vehicle floor, and as shown in FIG. 27, the shaft member 37 of the reverse movement preventing portion may be fixed to the seat S. According to this, the seat belt buckle 34
Since the distance between the mounting position and the mounting position can be made sufficiently small, it is advantageous in strength. Further, the reverse movement preventing claws 36A, 3
6B, the reverse movement preventing claw pressing member 40 and the like, and the reverse movement preventing portion constituent elements can be coupled at the same time, and the device can be fixed at the same time, which facilitates the assembly.

[0044]

As described above, according to the seat belt tightening device of the present invention, the device is operated to protect the occupant's body even when traveling on a rough road, and the structure of the device is simplified and downsized. By doing so, it can be suitably used for mounting on a vehicle. Further, it can be easily reset to the state before the start of operation.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view of a wire lead-in portion according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a housing member.

FIG. 3 is a vertical cross-sectional view of a main spring guide member equipped with a leaf spring.

FIG. 4 is an end view of the main spring guide member as viewed from the rear.

FIG. 5 is an exploded perspective view of a main spring guide member and a holder.

6A and 6B are an exploded perspective view and an assembled perspective view of a main spring guide member and a holder.

FIG. 7 is an overall vertical cross-sectional view of a wire retracting portion for explaining the operation of the device.

FIG. 8 is an enlarged vertical cross-sectional view of the rear portion of the wire retracting portion for explaining the operation of the device.

FIG. 9 is an overall vertical cross-sectional view of a wire retracting portion for explaining the operation of the device.

FIG. 10 is an enlarged vertical cross-sectional view of the rear portion of the wire retracting portion for explaining the operation of the device.

FIG. 11 is an enlarged vertical cross-sectional view of the rear portion of the wire retracting portion for explaining the operation of the device.

FIG. 12 is an overall vertical sectional view of a reverse movement preventing portion.

FIG. 13 is an overall exploded perspective view of a reverse movement preventing portion.

FIG. 14 is an overall perspective view of a reverse movement preventing claw.

FIG. 15 is an overall vertical cross-sectional view of a reverse movement preventing portion for explaining the operation of the device.

FIG. 16 is an overall vertical cross-sectional view of a reverse movement preventing portion for explaining the operation of the device.

FIG. 17 is a perspective view showing a relationship between a leaf spring and a reverse movement preventing claw.

FIG. 18 is an overall vertical cross-sectional view of a reverse movement preventing portion for explaining the operation of the device.

FIG. 19 is a perspective view showing a deformation of the reverse-travel preventing hook plate and the reverse-travel preventing pawl pressing plate that covers the reverse-travel preventing hook plate.

FIG. 20 is a perspective view of an end portion of the reverse movement preventing hook plate according to the second embodiment of the present invention.

FIG. 21 is a front view of the end portion of the reverse movement preventing hook plate according to the third embodiment of the present invention.

FIG. 22 is a front view of an end portion of the reverse movement preventing hook plate according to the fourth embodiment of the present invention.

FIG. 23 is a front view of an end portion of the reverse movement preventing hook plate according to the fifth embodiment of the present invention.

FIG. 24 is an exploded perspective view of a reverse movement preventing claw according to a sixth embodiment of the present invention.

FIG. 25 is an exploded perspective view of a reverse movement preventing claw according to a seventh embodiment of the present invention.

FIG. 26 is an exploded perspective view of a reverse movement preventing claw according to an eighth embodiment of the present invention.

FIG. 27 is an overall vertical cross-sectional view of a device according to Example 9 of the present invention.

[Explanation of symbols]

 Reference Signs List 11 casing 12 main coil spring 14 main spring guide member (pulling member) 17 wire (connecting member) 18 retainer (reset member) 21 housing member (base member) 212 connecting portion 213 shaft member (coupling point) 32 back plate (holding member) 33 Reverse-travel prevention hook plate (supporting member) 331 Long hole 332 Hook portion 34 Seat belt buckle (seat belt suspension member) 341 Connection point 36A, 36B Reverse-travel preventing claw (movement restriction member) 362 Leg portion (plate body) 364 Claw portion 37 Shaft Member (Supporting Part) 38 Leaf Spring (Spring Member) 40 Reverse Travel Prevention Claw Press Plate (Engagement Selection Member) 401 Opening 41 Leaf Spring (Engagement Disengagement Prevention Member)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Iwai 1-1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd.

Claims (11)

[Claims] 1. A suspension member for suspending a seat belt, a support member for supporting the suspension member, a holding member for linearly moving the support member, and a spring biasing force when an inertial force of a predetermined amount or more acts. A retraction member that can be moved rapidly, a connection member that connects the retraction member to the support member and moves the support member in the retraction direction with the movement of the retraction member, and the holding member engageable with the support member. And a movement restricting member that is provided in the engagement member and prevents movement of the support member in at least the pull-out direction in the engaged state,
When the return member is returned to the original position against the spring biasing force by the support member via the connecting member and the engagement selecting member for selectively setting the engagement and the cancellation of the movement restricting member, the pull-in member is reset again. A seat belt tightening device comprising: a reset member that is placed in a restrained state. 2. The supporting member is composed of an elongated plate member having a large number of serrated hooks formed in the longitudinal direction, and the movement restricting member is formed with serrated claws that engage with the hooks. 2. The seat belt tightening device according to claim 1, wherein the seat belt tightening device comprises a plate member, and a spring member is provided for urging the plate member in a direction in which a claw portion of the plate member engages with the hook portion. 3. An elongated hole extending in the longitudinal direction is formed in the center of the elongated plate constituting the support member, and the hook portions are formed on both side edges of the elongated hole parallel to each other. The seatbelt tightening device according to claim 2, wherein a pair of plate members constituting the above are provided so as to face the hook portions on both sides in the elongated hole. 4. A pair of plate members constituting the movement restricting member are rotatably supported on a common shaft member provided on a holding member at each end on the same plane, and the plate members are supported by the spring member. The seat belt tightening device according to claim 3, wherein the claw portions formed on the front end side edges of the respective plate members are urged so as to open in an octagonal shape so as to be engaged with the respective hook portions opposed to each other. . 5. The engagement member includes a spring member when the spring member is deformed against an urging force to move the plate member to a position where engagement with the hook portion is released. The seat belt tightening device according to any one of claims 2 to 4, further comprising a locking portion that locks the vehicle in its deformed posture. 6. A restriction wall is provided which restricts the deformation of the elongated hole formed with the hook by contacting both side edges of the elongated hole from the outside in a range in which the claws of the movement restricting member are engaged. Through 5
The seat belt tightening device according to any one of 1. 7. The holding member is rotatably connected at a base end to a base body, and a connection point with the base body, a connection point at a tip end of the support member for connecting the suspension member, and the shaft member are the same. The seat belt tightening device according to any one of claims 4 to 6, which are arranged in a straight line. 8. A suspension member for suspending a seat belt, a support member for supporting the suspension member, a holding member for linearly moving the support member, and a spring biasing force when an inertial force of a predetermined amount or more is applied. A retraction member that can be moved rapidly, a connection member that connects the retraction member to the support member and moves the support member in the retraction direction with the movement of the retraction member, and the holding member engageable with the support member. And a movement restricting member that is provided in the engagement member and prevents movement of the support member in at least the pull-out direction in the engaged state,
A seat belt tightening device, comprising: an engagement release prevention member for preventing the engagement of the movement restricting member from being released. 9. The seat belt tightening device according to claim 8, wherein the engagement blocking member maintains the blocked state even when a force is applied from the suspension member side, and cancels the blocked state by the retracting force from the retracting member side. 10. A suspension member for suspending a seat belt,
A supporting member that supports the suspension member, a holding member that linearly moves the supporting member and is fixed to the seat, and a retracting member that is rapidly moved by a spring biasing force when an inertial force of a predetermined amount or more acts. A connecting member for connecting the pull-in member to the support member and moving the support member in the pull-in direction as the pull-in member moves; and a holding member engageable with the support member for engagement. A seat belt tightening device including a movement restricting member that prevents movement of the support member in at least the pulling direction. 11. The seat belt tightening device according to claim 10, wherein the support of the holding member to the seat is common to the support portion of the movement restricting member to the holding member.