JPH07251705A - Seat belt tightening device - Google Patents

Abstract

PURPOSE:To make the structure of an entire device compact by molding a rear mass body in a cylindrical shape, composing a regulation member with plural elastic members extending backward from a front mass body and inserting stopper pieces installed on the tips of these elastic members in the cylinder of the rear mass body and engagingly locking them with its rear end opening edge. CONSTITUTION:A rear mass body 15 is molded in a cylindrical shape and also a regulation member 16 is composed of plural elastic members 163, 154 extending backward from a front mass body 14. The stopper pieces 165 installed on the tips 161 of respective elastic members 163, 164 are inserted in the cylinder of the rear mass body 15 and engagingly locked with its rear end opening edge 152. In this time, when an inertia is exerted to the mass bodies 14, 15 by vehicular rapid deceleration, etc., the engagingly locking state with the rear mass body 15 of the stopper piece 165 is released and the rapid fowarding of the front mass body 14 is allowed by the spring force of main spring member 12. Therefore, as a trigger mechanism for releasing the spring force is composed of plural elastic members 163, 164, the device can be stored compactly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt tightening device for tightening a seat belt when a vehicle is rapidly decelerating, and more particularly to a structural improvement of a simple and compact seat belt tightening device.

[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
Prior art), JP-A-4-317839 (second prior art), JP-A-4-63746 (third prior art), and the like.

[0003]

The first conventional example to the third conventional example are common in that a coil spring which is a retracting power source is housed in a cylindrical casing in a contracted state. In the first conventional example and the second conventional example, the trigger mechanism for extending and retracting the coil spring is located outside the casing, which is not yet sufficient in terms of making the device compact. In the third conventional example, further compactification is promoted in that it is housed in the casing including the trigger mechanism, but the housed trigger mechanism and the like are relatively complicated, and simplification of the device structure is still insufficient. is not.

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 which realizes simplification and compactness of the entire structure of the device.

[0005]

According to the structure of claim 1, the auxiliary spring member 13 having a relatively weak spring force, and the auxiliary spring member 13 are supported toward the front where the inertial force acts, and the front and rear portions are supported. The divided mass bodies 14 and 15 and the mass body 1
A casing 11 for accommodating 4 and 15 movably in the vehicle front-rear direction, and locking portions 141 and 151 formed in the front mass body 14 and the rear mass body 15 respectively, are relatively arranged in a contracted state. A main spring member 12 having a strong spring force, and a regulating member 16 extending from the front side mass body 14 and having its tip locked to the rear side mass body 15 to regulate the separation between the front side mass body 14 and the rear side mass body 15. The connecting member 17 connecting the front mass member 14 and the seat belt suspension member 34, and the front and rear mass members 14, 15 move forward against the spring force of the sub spring member 12 due to the action of inertial force. And a locking control means 18 for releasing the locked state of the regulating member 16 to allow the front mass body 14 to move forward rapidly by the main spring member 12, and the rear mass body 15 is tubular. In addition to being molded into 6 is constituted by a plurality of resilient members 163 and 164 extending rearwardly from the front mass 14, each elastic member 1 which has been expanded urged radially outwardly away from each other
A stopper piece 165 provided at the tip 161 of the 63, 164.
Is inserted into the cylinder of the rear mass body 15 and is locked to the rear end opening edge 152. According to the configuration of claim 2, a plurality of guide portions 146 extending in the axial direction are formed on the outer peripheral surface of the front mass body 14, and a part of each of the elastic members 163 and 164 is mounted and fixed in the guide portions 146. To do. According to the structure of claim 3, the elastic member is provided as the pair of leaf springs 16.
3, 164, and the locking portion 14 of the front mass body 14
1 is formed in the shape of a flange on the outer circumference of the mass body, and the flange-shaped locking portion is cut out at symmetrical positions in the radial direction to form a groove 143, and the pair of leaf springs 16 is bent and formed into a U-shape. It is composed of a plate, and its base end 162 is the front side mass body 1 described above.
4 is made to abut on the front end face of No. 4 and both legs are attached to each groove 1
It passes through the inside of 43 and can be extended backward. According to the structure of claim 4, the elastic member is composed of the leaf springs 163, 164, and the tip ends 161 of the leaf springs 163, 164 are inserted into the cylinder of the rear mass body 15 before the both plates are inserted. A ring body 22 for restricting the springs 163, 164 to a converged state is mounted, and the ring body 22 is pushed by the cylinder end surface as the leaf springs 163, 164 are inserted into the cylinder of the rear mass body 15. The leaf springs 163 and 164 are set so as to be moved toward the base end 162. According to the configuration of claim 5,
The elastic member is composed of leaf springs 163 and 164, and the rear end opening edge 152 of the rear side mass body 15 with which the stopper piece 165 at the tip of each leaf spring 163 and 164 abuts is different from the material of the mass body 15 general portion. Composed of high hardness material. According to the configuration of claim 6, the front mass body 14 is formed into a tubular shape, and the connecting member 17 is formed in a part of each cylinder wall of the front mass body 14 and the rear mass body 15 to form a separation gap 145, After being inserted into the cylinder of each of the mass bodies 14 and 15 from the side via 153,
The sub spring member 13 is provided between the front end 171 of the connecting member 17 positioned in front of the front mass body 14 and the front mass body 14.
To arrange.

[0006]

In the structure of claim 1, when inertial force acts on the mass bodies 14 and 15 due to sudden deceleration of the vehicle, the front and rear mass bodies 14 and 15 move forward against the spring force of the sub spring member 13. To do. Each elastic member 16 is controlled by the locking control means 18.
Of the stopper piece 165 provided at the tip 161 of 3,164,
The locked state with the rear mass body 15 is released, and the spring force of the main spring member 12 causes the front mass body 14 to rapidly move forward. As a result, the front side mass body 14 is connected by the connecting member 17.
The seat belt suspension member 34 connected to the seat belt suspension member 34 is rapidly retracted. The inertial force at which the mass bodies 14 and 15 start moving can be easily set by adjusting the spring force of the sub spring member 13. Since the trigger mechanism that holds the main spring member 12 in the contracted state and releases the spring force when the device is operated is composed of the plurality of elastic members 163 and 164,
The device structure is simple, and all the components of the device can be compactly housed in the casing 11.

In the structure of claim 2, the guide member 1
The elastic members 163 and 164 are positioned by 43 without swinging in the axial direction.

In the structure of claim 3, the above-mentioned claim 2
In addition to the above function, since the pair of leaf springs 163 and 164 are formed by one strip plate, the structure is further simplified.

According to the fourth aspect of the present invention, the expanding leaf springs are regulated in a convergent state by the ring body and inserted into the cylinder of the rear mass body, so that the insertion work is easy.

In the structure of claim 5, since only the rear end opening edge of the rear mass body with which the stopper piece abuts is made of a high hardness material, the mass body general portion is made of, for example, a resin material to reduce the weight. The rear end opening edge can be made of a metal material to prevent its wear and the like.

In the structure of claim 6, the connecting member 17
Through the cylinder of each of the mass bodies 14 and 15 and
Since the auxiliary spring member 13 is disposed between the front mass body 14 and the front mass body 14, the components of the device are located along the axis, and the device can be made more compact. Then, the separation gaps 145, 15 formed on the cylinder walls of the mass bodies 14, 15 are separated.
Since the connecting member 17 can be inserted into the cylinder from the side by means of 3, the insertion work is also easy.

[0012]

[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.

Inside the closed casing 11, a main spring guide member 14 as a front mass body and a holder 15 as a rear mass body are arranged at front and rear positions. As shown in FIGS. 3 and 4, the main spring guide member 14 has a large diameter in the first half,
A metal cylindrical body having a through hole 142 having a small diameter in the latter half,
A rectangular groove 143 extending in the axial direction is formed at two upper and lower locations on the flange-shaped spring locking portion 141 formed on the outer circumference.
A leaf spring 16 is provided here as a restricting member that gradually widens the facing interval toward the rear. That is, the leaf spring 16
Is a belt plate bent into a substantially U shape, and its base end portion is a flange plate 162 along the end surface shape of the main spring guide member 14, as shown in FIG. And leaf spring 1
Both leg portions 163 and 164 of 6 extend rearward through the upper and lower grooves 143 of the main spring guide member 14 and each tip 161.
A stopper piece 165 is caulked and fixed to this.

In FIG. 1, a holder 15 is a large-diameter resin cylindrical body capable of accommodating the latter half of the main spring guide member 14, and the flange-shaped spring engaging 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 tip end of the leaf spring 16 in a converged state against the spring force is inserted into the cylinder. In this state, while sandwiching the main coil spring (not shown) between the locking portion 151 of the holder 15 and the locking portion 141 of the main spring guide member 14,
When the holder 15 is pushed in from above the receiving ring 22, the receiving ring 22 is pushed by the end opening end face of the holder 15 and the holder ring 22 is pressed.
As shown in (2), the push-out projections 221 which are moved in the direction of the main spring guide member 14 and are formed at two locations on the peripheral wall (FIG. 1) are fitted in the locking grooves 144 formed on the outer circumference of the main spring guide member 14. It is engaged and fixed. Note that the strong extension spring force of the main coil spring 12 is due to
Flange plate 1 of leaf spring 16 abutting on the end face of 1, 151
It is received by 62 and the stopper piece 165.

In FIG. 1, both ends 1 of the leaf spring 16 are
An outer peripheral surface 18a of a block-shaped retainer 18 serving as a locking control means 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. A coil spring 23 arranged between the inner wall of the rear end 21 and the inner wall of the rear end 21 urges the coil 21 forward. 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 arranged as a sub spring member and integrated by the leaf spring 16. Main spring guide member 1 before and after
4 and the holder 15 are supported toward the front.

A positioning member 19 is attached to an intermediate position of the wire 17, and a distal bent portion of a flexible claw 191 extending rearward from the vertical position of the positioning member 19 is retained by the retainer 18.
Of the through hole 181 is locked. Due to the dust
A 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 a sudden deceleration of the vehicle, etc. in the retracted 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 appropriately 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 backward to bring the rear end of the stopper piece 165 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 Function of the Reverse Tightening Device of the Tightening Device) FIG.
2, the fixed cover 31 of the reverse movement preventing portion has a flat rectangular tubular shape, and the narrow lower end portion 321 of the buckle plate 32 projecting obliquely downward from the lower end of the cover 31 is rearward from the casing 11 of the retracting portion. Projecting connecting part 21
The shaft 2 is rotatably connected to the shaft 2. The body part 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 backlash preventing hook plate 33, which is slightly narrower than the buckle plate 32, is slidably provided 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 in the center of the plate surface, and the saw teeth are provided on both side surfaces of the elongated hole 331 which face each other in parallel. A large number of hook-shaped parts 332 are formed. A seat belt buckle 34 is fixed to the upper end of the reverse movement preventing hook plate 33.
The entire reverse movement preventing hook plate 33 except 4 is housed in the movable cover 35. The movable cover 35 has a flat rectangular tubular shape, and is entirely formed into a bellows shape and is expandable and contractible. It is locked in the stop groove 311.

A pair of left and right reverse-prevention claws 36A and 36B are provided in the elongated hole 331 of the reverse-prevention hook plate 33. These reverse-prevention claws 36A and 36B are press-formed products of a plate material and are mutually formed. Symmetrical shape, ring head 3 at one end
61 and a leg portion 362 extending therefrom. As shown in FIG. 14, the head portion 361 of one reverse movement preventing pawl 36A has a step difference from the head portion 361 of the other one, and when these head portions 361 are stacked, each leg 362 is positioned on the same plane. To do. This prevents the moment force from being applied when the reverse-traveling hook plate 33 described later is engaged with the hook portion. The head portion 361 on which the reverse movement preventing pawls 36A and 36B are overlapped is provided with a mounting hole 322 (see FIG. 1) of the buckle plate 32.
3) is inserted into the tubular shaft member 37 inserted into the shaft member 3
It can be rotated around 7. Reverse-travel prevention claws 36A, 36
Each of the leg portions 362 of B has elongated holes 363 along the inner edge thereof, and the distal ends of both legs of a leaf spring 38 (FIG. 13) bent and formed in an inverted U shape are inserted into these elongated holes 363. .
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 is inserted into each of the elongated holes 363. Then, the oblong hole 331 of the reverse movement preventing hook plate 33
In the state of FIG. 12 located inside, the left and right reverse-prevention claws 36
A and 36B are leg portions 362 of each other due to the leaf spring 38.
(FIG. 14) is biased so as to separate from each other, and a plurality of serrated claw portions 364 formed on the outer surface of each leg portion 362 engages with the hook portion 332 of the reverse movement preventing hook plate 33. Prevents upward movement.

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.
It passes through the opening 391 of the movable plate 39 provided so as to be overlapped with 6A and 36B, and reaches the upper wide portion of the T-shaped opening 401 formed in the reverse movement preventing claw pressing member 40. The movable plate 39 can move 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, and the leg portion 3 moves downward from the left and right position of the lower end.
92 is protruding. The reverse movement preventing claw pressing member 40 is a plate body having both side edges bent at a right angle to form a regulating wall 402, which is located so as to cover the movable plate 39 and is provided on the left and right regulating walls 40.
2 is in contact with the outer side surfaces of the reinforcing ribs 333 which are erected on both side edges of the reverse movement preventing hook plate 33 to prevent outward deformation thereof. In the reverse movement preventing claw pressing member 40, the notch 403 formed at the lower ends of the left and right restriction walls 402 has the buckle plate 3
It is fitted into the rectangular convex portions 323 formed on the left and right side edges of 2. Mounting hole 40 provided on the plate surface of the reverse movement preventing pawl pressing member 40
4 is a head portion 361 on which the reverse movement preventing pawls 36A and 36B are overlapped.
The shaft member 37 penetrating the inside is inserted, and the cylindrical wall of the shaft member 37 is expanded and deformed at the insertion end, so that the reverse movement preventing claw pressing member 40 is fastened to the buckle plate 32.

In FIG. 12, the rectangular head portion 411 of the leaf spring 41 is provided between the reverse movement preventing pawls 36A and 36B which are separated from each other on the left and right sides.
Is set to the insertion position, and these reverse movement preventing claws 36A, 3
6B is blocked from moving inward. Therefore, in this state, the reverse-prevention claws 36A and 36B have the reverse-prevention hook plate 33.
It does not come off from the hook portion 332.
(That is, the seat belt buckle 34) is prevented from moving not only upward but also downward. The upper edge of the head 411 is substantially U-shaped in the buckle plate 32 direction.
The head 41 is bent so as to form a cross section (FIG. 13).
1 is increased in strength in the width direction and a reverse movement preventing pawl 36 described later.
It is possible to get on A and 36B. The leaf spring 41 has a leg portion 413 that is opened from the head portion 411 in a figure-of-eight shape via a connecting portion 412, and the tip end of each leg portion 413 is a stopper wall formed by bending at the lower end of the backward movement preventing hook plate 33. It is inserted into the mounting hole 335 of the 334. 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 of the reverse movement preventing pawl pressing member 40 (see FIG. 1).
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 pushes it to the upper wide portion of the opening of the reverse movement preventing claw pressing member 40. 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,
The head portion 411 of the leaf spring 41 is again fitted by the spring force between the reverse movement preventing pawls 36A and 36B opened to the left and right to prevent the head portion 411 from being displaced inward (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.

In order to mount the seat belt tightening device, the casing 1 of the retracting portion as in this embodiment is used.
Instead of fixing 1 to the vehicle floor, the shaft member 37 (FIG. 13) of the reverse-travel prevention unit may be fixed to the seat, whereby the distance between the seat belt buckle 34 and the mounting position is reduced. It can be made small enough. Further, instead of passing the wire 17 from the retracted portion to the reverse movement prevention portion into the flexible tube 42, it may be suspended on a pulley or the like. Instead of locking the tip of the claw portion of the positioning member 19 (FIG. 1) to the inner circumference of the retainer 18, a step may be formed on the inner circumference of the housing member 21 and locked therein.

[0030]

[Embodiment 2] Instead of the above embodiment in which the leaf spring is manufactured from one strip, as shown in FIG. 19, the upper and lower leaf springs 16A,
16B may be molded separately, and each base end may be fixed to the outer peripheral surface of the main spring guide member 14 at a radially symmetrical position with a bolt 147. In this case, grooves 146 (only one of which is shown) having substantially the same width as the leaf springs 16A and 16B extending in the axial direction are formed on the outer peripheral surface, and the base ends of the leaf springs 16A and 16B are fitted into these grooves 146. Fix it in place. Accordingly, it is possible to effectively prevent the leaf springs 16A and 16B from swinging in the axial direction.

The number of leaf springs installed is not limited to one and may be three or more.

[0032]

As described above, according to the seat belt tightening device of the present invention, the structure of the device can be simplified and downsized, and the device can be suitably used for mounting on a vehicle, and the device can be used when traveling on a rough road. It is possible to protect the body of the occupant by operating the.

[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 an exploded perspective view of a main spring guide member equipped with a leaf spring according to a second embodiment of the present invention.

[Explanation of symbols]

 11 Casing 12 Main Coil Spring (Main Spring Member) 13 Sub Coil Spring (Sub Spring Member) 14 Main Spring Guide Member (Front Mass Body) 141 Locking Part 143, 146 Groove 145 Separation Gap 15 Holder (Rear Side Mass Body) 151 Locking Part 152 Metal Ring (Rear End Opening Edge) 153 Separation Gap 16 Leaf Spring (Regulating Member) 161 Tip 162 Flange Plate (Base End) 163, 164 Leg (Leaf Spring) 165 Stopper Piece 17 Wire (Connecting Member) 171 Locking Plate (Tip) 18 Retainer (locking control means) 18a Contact surface 19 Positioning member 22 Ring body (receiving ring) 34 Seat belt buckle (seat belt suspension member)

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

Claims (6)

[Claims] 1. An auxiliary spring member having a relatively weak spring force, a mass body supported toward the front where inertial force acts by the auxiliary spring member, and divided into front and rear parts, and the mass member in the vehicle longitudinal direction. And a main spring member having a relatively strong spring force arranged in a contracted state between locking portions formed on the front mass body and the rear mass body, respectively, and the front mass body. Extends and the tip is locked to the rear mass,
A regulation member that regulates the separation between the front mass body and the rear mass body,
A connecting member for connecting the front side mass body and the suspension member of the seat belt, and locking of the regulating member when the front and rear mass bodies move forward against the spring force of the sub spring member due to the action of inertial force. The state is released, and a locking control means that allows the front mass body to move rapidly forward by the main spring member is provided, and the rear mass body is formed into a tubular shape, and the regulating member is provided from the front mass body. A stopper piece, which is composed of a plurality of elastic members extending rearward, and which is provided at the tip of each elastic member that is urged to expand outward in the radial direction to be separated from each other, is inserted through the cylinder of the rear mass body. A seat belt tightening device characterized by being locked to an opening edge of a rear end thereof. 2. The seat belt tightening device according to claim 1, wherein a plurality of guide portions extending in the axial direction are formed on the outer peripheral surface of the front mass body, and a part of each elastic member is mounted and fixed in the guide portions. . 3. The elastic member comprises a pair of leaf springs,
The engaging portion of the front mass body is formed in a flange shape on the outer circumference of the mass body, and the flange-like engaging portion is cut out at a radially symmetrical position to form a groove, and the pair of leaf springs are bent and formed in a U shape. 2. The seat according to claim 1, wherein the seat is constituted by one strip plate, the base end portion of which is brought into contact with the front end surface of the front side mass body, and the both leg portions are passed through the respective grooves and extended rearward. Belt tightening device. 4. The elastic member is composed of leaf springs, and a ring body for restricting both leaf springs to a converged state is attached before the tip of each leaf spring is inserted into the cylinder of the rear mass body. The ring body is set so as to be pushed by the end face of the cylinder as the leaf spring is inserted into the cylinder of the rear mass body and moved toward the base end of the leaf spring. Seat belt tightening device described. 5. The elastic member is composed of a leaf spring, and the rear end opening edge of the rear mass body, which a stopper piece at the tip of each leaf spring contacts, is composed of a high hardness material different from the material of the general portion of the mass body. The seat belt tightening device according to any one of claims 1 to 4. 6. The front mass body is formed into a cylindrical shape, and the connecting member is laterally passed through a separation gap formed in a part of each cylinder wall of the front mass body and the rear mass body. The seat belt tightening according to any one of claims 1 to 5, wherein the auxiliary spring member is disposed between the front end of the connecting member positioned in front of the front mass member and the front mass member after being inserted into the cylinder. apparatus.