JP2002187469A - Occupant restraint - Google Patents

Abstract

(57) [Summary] [Problem] To prevent the submarine phenomenon reliably in the event of a collision and to reduce
Provided is an occupant restraint device that is easy to assemble. A pair of casings fixed to left and right seat frames at a front portion of a seat cushion to prevent an occupant from slipping forward from a lower portion of a seat belt at the time of an impact, and a base end at a front end of the casing. An arm whose side is pivotally mounted, a horizontal member bridged over the free ends of the left and right arms, and received by at least one of the left and right casings,
A power generation device that drives the horizontal member to lift upward when an impact is generated, wherein the casing of the occupant restraint device is elongated in the front-rear direction, and extends vertically from the upper and lower ends of the plate-like portion and the plate-like portion. By having a body member having a laterally extending upper and lower flange and a lid member coupled to the free ends of the two flanges to define a closed contour casing in cooperation with the body member, Are unified on the sides to improve the ease of assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occupant restraint system provided on a vehicle seat, and more particularly, to the prevention of a submarine for preventing an occupant from slipping forward from a lower portion of a seat belt when an impact such as a vehicle collision occurs. The occupant restraint device described above.

[0002]

2. Description of the Related Art There is a so-called submarine phenomenon in which an occupant slides forward from a lower portion of a seat belt when an impact such as a vehicle collision occurs, and a waist belt comes off a pelvis portion. This submarine phenomenon is likely to occur when the occupant is sitting shallow on the seat or leaning down the seat back, etc.
In some cases, there are problems such as a reduction in the occupant restraint effect of the seat belt and a shift in the occupant restraint portion.

In view of the above, at the front of the seat cushion, a sliding prevention member is movably supported by left and right casings fixed to the seat frame so as to be able to protrude upward. An occupant restraint system in which the front end of the seat is raised only when an impact is generated by driving with a generator is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-272446 by the same applicant.

[0004]

The above-mentioned casing is required to have a certain high strength due to the reaction force from the occupant. However, depending on the structure, the casing becomes large and heavy, and the assembly of the internal mechanism becomes troublesome. There is a problem.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by reliably preventing a submarine phenomenon at the time of a collision, increasing the weight and size of the occupant restraint device, and making it easy to manufacture and assemble. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION According to the present invention, it is possible to prevent an occupant from slipping forward from a lower portion of a seat belt when an impact such as a vehicle collision occurs.
A pair of casings fixed to the left and right seat frames at the front of the seat cushion, an arm having a base end pivotally attached to the front end of the casing, and a lateral member bridged over the free ends of the left and right arms, An occupant restraint device comprising: a power generation device that is received by at least one of the left and right casings and that drives the horizontal member to lift upward when an impact such as a vehicle collision occurs, wherein the casing is
A plate-like portion that is long in the front-rear direction and extends vertically, an upper flange extending laterally from an upper end of the plate-like portion, and a horizontal extension extending from the lower end of the plate-like portion in the same direction as the upper flange. An occupant restraint system comprising: a body member having a lower flange; and a lid member coupled to the free ends of the flanges to define a closed contour casing in cooperation with the body member. Achieved by providing. In particular, the power generating device is configured to engage the position vertically offset from the pivot of the arm and drive the engaging portion in the front-rear direction to tilt the free end of the arm upward, The power generating device may be engaged with a shoulder surface in front and behind an opening formed in a vertical intermediate portion of the plate-shaped portion of the main body member and a vertical intermediate portion of the lid member, and A power generator has a flange provided at a front end and a cylindrical portion extending rearward from the flange, wherein the shoulder conforms to the cylindrical profile of the cylindrical portion, and Is preferably engaged. Further, the lid member of the casing may include a part of the seat frame.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a vehicle seat 1 to which the present invention is applied. FIGS. 2 and 5 show a pair of left and right sub-assemblies 2 and 3 constituting an occupant restraint device assembled to the vehicle seat 1. FIG. 3 shows an exploded perspective view. The vehicle seat 1 includes a seat cushion portion 1a and a seat back portion 1b. The seat cushion portion 1a includes a substantially rectangular frame-shaped seat frame 4 and a cushion member 5 formed of a foam material or the like covering the upper portion thereof. Have. A pair of sub-assemblies 2 and 3 are fastened to the left and right of the seat frame 4. Although not shown, the seat frame 4 may be supported on a seat rail fixed to the vehicle body via a slider so as to be slidable in the front-rear direction, and may be fixed at a desired position by a seat adjuster mechanism.

FIGS. 2 and 3 show the structure of the right sub-assembly 2 in FIG. 1 of the occupant restraint system. The sub-assembly 2 includes a casing 6 having a substantially rectangular cylindrical shape with a closed cross section, an arm 11 having a free end pivotally attached to the casing 6 so that the free end can be tilted in a vertical direction, and a casing 6 for driving the arm 11. Power generator 2 received and supported
2 and the casing 6 near the working end of the power generation device 22.
And a one-way lock mechanism 24 that is received and supported. The casing 6 includes, for example, a main body member 7 formed by pressing a plate material and a lid member 8. Body member 7
Has a plate-like portion 7a that is long in the front-rear direction and extends vertically, a flange 7b extending laterally from an upper end and a lower end of the plate-like portion 7a, and a plurality of flanges 7b provided at appropriate positions of the two flanges 7b. The pawl 9 is inserted into the hole 10 formed in the lid member 8 and caulked as shown in FIG. 4, whereby the lid member 8 is connected to the free ends of both flanges 7b, and the two members 7, 8 cooperate. A closed contour casing 6 is defined.

The arm 11 is formed by pressing a plate material, for example, and has an upper surface 11a and a pair of side surfaces 11b which are bent from right and left ends of the upper surface 11a and extend downward. Holes 18 penetrate the left and right side portions 11b.
Are formed. Also, corresponding holes 12 and 13 are formed in the distal end portions of the main body member 7 and the lid member 8. Then, the front ends of the main body member 7 and the lid member 8 are sandwiched between the pair of side surfaces 11b, the holes 12, 13 and the holes 18 are aligned, the collar 25 is penetrated, and the collar 25 is bolted to the collar 25.
The bolt 26 is also passed through a hole (not shown) formed in the side surface of the seat frame 4 and fastened with a nut. These holes 12, 13, 18 and collar 2
5 constitutes the pivot of the arm 11. The rear end portion of the lid member 8 extends slightly above the contour of the main body member 7, and has a hole 28. Bolts 29 are passed through the holes 28, and are also passed through holes (not shown) formed in the side surface of the seat frame 4 and fastened with nuts. The sub-assembly 2 is fixed to the seat frame 4 by these bolts 26 and 29.

The head portion 25a of the collar 25 contacts the side surface of the seat frame 4, so that the arm 11 does not interfere with the seat frame 4. In addition, a rubber ring 27 is interposed between the lid member 8 and the enlarged head 25a of the collar 25 in order to absorb a mounting error such as a dimensional error between the subassembly 2 and the seat frame 4.

At a hole 18 of the arm 11, that is, at a position offset downward from the pivot, a relatively short elongated hole 19 extending obliquely in the vertical direction is formed. In addition, this long hole 19
Corresponding to the above, elongated holes 14 and 15 extending in the front-rear direction are formed at the distal ends of the main body member 7 and the lid member 8. Slot 1
Reference numerals 4 and 15 correspond to the annular distal end 23a of the piston rod 23 as the operating end of the power generating device 22. These long holes 15, one long hole 19 of the arm 11, the annular tip 2
The pin 30 is passed through the hole 3a, the other long hole 19 and the long hole 14 of the arm 11, and the tip thereof is
The arm 11 is connected to the piston rod 23 by swaging and the arm 11 is tilted in conjunction with the forward and backward movement of the piston rod 23.

The power generating device 22 has a flange 22a provided at a front end thereof, and a cylindrical portion extending rearward from the flange 22a. On the other hand, openings 16 and 17 having closed contours are formed in an intermediate portion between the main body member 7 and the lid member 8. The flanges 22a are engaged with the rear end shoulders of the openings 16,17. The openings 16 and 17 also support a one-way lock mechanism 24. As shown in FIG. 4, the rear portion from the openings 16 and 17 of the main body member 7 and the lid member 8 has a shape along the cylindrical portion, and the opening 1
The rear shoulder surfaces 6, 17 also conform to the cylindrical contour of the cylindrical part. Therefore, the contact area with the flange 22a is larger than that of the openings 16 and 17 whose shoulders at the rear ends are straight, and when the openings 16 and 17 are viewed in cross section of the main body member 7 and the lid member 8, Because it is closed up and down,
Further, since the upper and lower cross sections are substantially symmetrical with respect to the cylindrical portion of the power generation device 22, the strength of the casing 6 against impact when the occupant restraint device is operated is improved.

On the other hand, as shown in FIGS. 5 and 6, the structure is the same as that of the sub-assembly 2 except that the left sub-assembly 3 is not provided with a power generating device. And an arm 41 having a free end pivotally attached to the casing 36 so as to be tiltable in the vertical direction.
6 and a rod 53 similar to the piston rod 23 to be engaged with the arm 41, and a one-way lock mechanism 54 also received and supported by the casing 36. The casing 36 is provided with a main body member 37 as described above.
A plurality of claws 39 provided at appropriate positions on the side are inserted into holes 40 formed in the lid member 38 and are defined by caulking.

The arm 41 having the same structure as the arm 11 has
It has an upper surface portion 41a and a pair of side surface portions 41b which are bent from right and left ends of the upper surface portion 41a and extend downward, and a hole 48 is formed so as to penetrate the left and right side surface portions 41b. . Also, corresponding holes 42 and 43 are formed at the distal ends of the main body member 37 and the lid member 38. Then, the pair of side portions 41b sandwich the distal ends of the main body member 37 and the lid member 38, align the holes 42, 43 with the holes 48, allow the collar 55 to penetrate, and allow the bolt 55 to penetrate the collar 55. The bolt 56 is also passed through a hole (not shown) formed in the side surface of the seat frame 4 and fastened with a nut. The holes 42, 43, 48 and the collar 55 constitute a pivot of the arm 41. Also, the lid member 38
The rear end portion extends slightly above the contour of the main body member 37 and has a hole 58 formed therein. Bolts 59 are passed through the holes 58, and are also passed through holes (not shown) formed in the side surface of the seat frame 4 and fastened with nuts. The sub-assembly 3 is fixed to the seat frame 4 by these bolts 56 and 59.

The widened head 55a of the collar 55 contacts the side surface of the seat frame 4, and the arm 41 does not interfere with the seat frame 4. Further, a rubber ring 57 is interposed between the cover member 38 and the enlarged head portion 55a of the collar 55 in order to absorb a mounting error such as a dimensional error between the subassembly 3 and the seat frame 4.

At a position offset downward from the hole 48 of the arm 41, a relatively short elongated hole 49 extending diagonally up and down is formed. In addition, elongated holes 44 and 45 extending in the front-rear direction are formed at the distal ends of the main body member 37 and the lid member 38 corresponding to the elongated holes 49. Slots 44, 4
Reference numeral 5 corresponds to the annular tip 53a of the rod 53. These long holes 45, one long hole 49 of the arm 41, a hole of the annular tip 53a, the other long hole 49 and the long hole 4 of the arm 41.
The arm 41 is connected to the rod 53 by passing the pin 60 through the pin 4 and inserting the tip end of the pin 60 into the retainer ring 61 and caulking.
Moves back and forth. On the other hand, openings 46 and 47 having closed contours are provided at an intermediate portion between the main body member 37 and the lid member 38.
Are formed. The openings 46 and 47 also support a one-way lock mechanism 54. Rod 53
Has an intermediate portion that passes through the one-way lock mechanism 54 and is supported by the one-way lock mechanism 54.

At the free end of the arm 11 of the sub-assembly 2, a pair of tongue-shaped pipe supports 20 extend forward from the side surfaces 11b, and one end of a pipe 32 as a horizontal member is provided on the upper surface thereof. Are welded. Also, at the free end of the arm 41 of the subassembly 3, a pair of tongue-shaped pipe support portions 50 extend forward from both side portions 41b, and the pipe 32 as a horizontal member is welded to the upper surface thereof. I have. That is, the pipe 32 is connected to the arm 11 and the arm 4
It is hung between one and one. Here, the pair of tongue-shaped pipe support portions 20 are connected to each other in the front-rear direction intermediate bent portion 21.
The welding is made closer to the middle portion than the end of the pipe 32 to prevent the occurrence of uneven welding or to prevent the pipe 32 from projecting outward.
Similarly, the pair of plate-shaped pipe support portions 50 are also close to each other at the middle bent portion 51 in the front-rear direction, and are welded closer to the middle portion than the endmost portion of the pipe 32.

As shown in FIG. 7, the power generating device 22
A cylinder 72 constituting the cylindrical portion, and a piston main body 71 reciprocally received in an inner hole of the cylinder 72.
And a gas generator 73 received on the base end side of the piston main body 71. Between the piston body 71 and the gas generator 73, the seal member 74 and the piston body 71 which have elasticity in the axial direction and reliably prevent leakage when gas is generated are moved in the operation direction (projection direction). A compression coil spring 75 for always energizing is interposed.
The piston body 71 engages with the base end of the piston rod 23 and drives it forward.

A one-way lock mechanism 24 is provided at the tip of the power generation device 22. The one-way lock mechanism 24 includes an engagement piece 78 for selectively engaging the outer circumference of the piston rod 23 inside a casing 76 covering the outer circumference of the piston rod 23, and the engagement piece 78 It has a structure that receives a spring 79 that biases toward the base end, that is, the cylinder 72 side. Engagement piece 78
Is gradually reduced in diameter from the annular distal end portion 23a side of the piston rod 23 toward the proximal end side. In the casing 76, there is formed a tapered portion 77 gradually narrowing from the annular distal end 23a side of the piston rod 23 toward the base end side. Therefore, in the state of FIG.
9 and is pressed by the tapered portion 77 to contact the outer peripheral surface of the piston rod 23.
When the piston rod 23 moves in the protruding direction, the engagement piece 78 also moves in the direction in which the piston rod 23 protrudes against the urging force of the spring 79, and does not hinder the movement of the piston rod 23. Move freely. Conversely, piston rod 23
When it is attempted to move in the direction of immersion, the engaging piece 78 moves to the tapered portion 77 by the urging force of the spring 79 and abuts against the outer peripheral surface of the piston rod 23 to fix them. Here, an annular concave or convex engaging portion 23b is formed on the outer peripheral surface of the piston rod 23. In addition, the inner peripheral surface of the engagement piece 78 also has
Are formed. Therefore,
When the piston rod 23 is to be moved in the direction of immersion, the inner peripheral surface of the engagement piece 78 and the outer peripheral surface of the piston rod 23 are engaged, and the two are firmly fixed and the position is maintained. Has become.

In the above configuration, one engaging piece 78 is used to engage with a part of the outer peripheral surface of the piston rod 23. However, a plurality of engaging pieces are used to cover the entire outer peripheral surface of the piston rod 23. It is good also as a structure which engages over.

The structure of the one-way lock mechanism 54 is the same as that of the above-described one-way lock mechanism 24, and the structure of the rod 53 is also the same as that of the piston rod 23.

An occupant restraint system is constituted by the left and right sub-assemblies 2 and 3, the pipe 32, impact generation detecting means and control means including an acceleration sensor (not shown) and the like.

Next, the operation of this embodiment will be described. First, when the occurrence of an impact such as a collision is detected by a sensor or the like (not shown), gas is generated in the gas generating device 73, and the internal pressure of the cylinder 72 rapidly increases, thereby generating a thrust in the projecting direction of the piston body 71. Then, the distal end side of the piston rod 23 engaged with the piston main body 71 projects from the cylinder 72 instantaneously. Then, the piston rod 23
The arm 11 connected to the annular distal end portion 23a tilts counterclockwise as shown by the imaginary line in FIG. 3, and the pipe 32 moves (projects) upward, and in some cases, expands the seat cushion. Accordingly, the arm 41 also tilts as shown by the imaginary line in FIG. 6, and the rod 53 also moves forward. This prevents the submarine phenomenon of the occupant. Even when the gas generation by the gas generating device 73 is completed and the driving force of the power generating device 22 is lost, the one-way lock mechanisms 24 and 54 do not cause the piston rod 23 and the rod 53 to move backward. It does not return downward. Therefore, the effect of preventing the submarine phenomenon is maintained.

Although the power generation device 22 is provided only on the right side of the seat in this configuration, it may be provided on both left and right sides. If the power generating devices are provided on both the left and right sides, one power generating device can be reduced in size, and the device does not locally increase in size.

FIG. 8 is a view similar to FIG. 6 showing a modified example on the side without the power generation device, that is, on the side of the sub-assembly 3, and the same parts as those in FIG. Detailed description is omitted. In this configuration, similarly to the sub-assembly 3, the casing 7 includes a main body member and a lid member.
0 extends to the vicinity of the free end of the arm 41, and the one-way lock mechanism 54 is received in the lower part of the arm 41 which becomes a dead space in the above configuration. Further, the extending direction of the rod 53 is reversed, that is, extends from the pin 60 to the left side in the figure, and protrudes into the one-way lock mechanism 54. The casing 70 includes a pivot portion of the arm 41 (the collar 55, the bolt 5
6) and a bolt 59 inserted into a hole 58 located below the one-way lock mechanism 54, and is fixed to the seat frame 4 in the same manner as described above. With this structure, the size of the subassembly can be reduced. It goes without saying that a similar structure can be applied to the sub-assembly 2 side.

FIGS. 9 and 10 are views similar to FIG. 6 showing another modification of the sub-assembly 3 side. In this configuration, the base plate 8 made of a plate material is used instead of the casing.
2, the arm 83 is pivotally connected to the arm 83. Arm 83
Is a plate-like portion 84a extending vertically and the plate-like portion 8
Upper and lower flanges 84b extending laterally from upper and lower ends of 4a
Body member 84 formed by pressing a plate material having, for example,
And the lid member 85. The lid member 85 is aligned with the free ends of the flanges 84b, and the pins 86 are inserted into the holes formed in the both members and swaged to join the two members 84 and 85. The arm 83 has a closed contour. The arm 83 is pivoted (the collar 87 and the bolt 88)
To pivotally attach to the base plate 82. FIG.
10, the bolt 88 is also passed through a hole formed in the side surface of the seat frame 4 and fastened with a nut. Also, the base plate 82
A hole 89 is formed at a position slightly separated from the pivot portion. A bolt 90 is made to pass through this hole 89, and a hole 89 formed in the side surface of the seat frame 4 is further penetrated through a spacer 91. Fastened with nuts. The sub-assembly is fixed to the seat frame 4 by the bolts 88 and 90.

Ratchet teeth 93 are formed around a pivotal portion of the base plate 82. A ratchet pawl member 94 is pivotally supported on the pin 86 of the arm 83.
The ratchet pawl member 94 is attached to the main body member 8 of the arm 83.
4 is urged toward the ratchet teeth 93 by a torsion coil spring 95 supported by a supporting piece 84c formed by cutting and raising the cutting piece 4. The one-way lock mechanism 92 is constituted by the ratchet teeth 93, the ratchet pawl member 94, and the torsion coil spring 95.

Although not shown, a ball one-way lock device or the like that can be locked at a stepless position may be provided as a one-way lock mechanism.

FIG. 11 is a view similar to FIG. 2 in another embodiment to which the present invention is applied, and the same parts as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. . In this configuration, in the right sub-assembly 2, the slightly thin arm 11 is attached to the front end of the plate-shaped portion 7 a of the main body member 7 and the lid 8.
It is arranged so as to be sandwiched between the front end portion thereof. The same applies to the left side sub-assembly side not shown. Thereby, the bulge in the width direction can be suppressed. Otherwise Figure 2
The configuration is the same as that described above.

FIG. 12 is a view similar to FIG. 11 in another embodiment to which the present invention is applied. The same parts as those in FIG. 11 are denoted by the same reference numerals, and detailed description thereof will be omitted. . In this configuration, the lid 108 that constitutes the casing is a part of the seat frame 4, and the number of parts is reduced and the weight is reduced. Further, similarly to the configuration of FIG.
It is arranged so as to be sandwiched between the front end portion of FIG. The same applies to the left side sub-assembly side not shown. Otherwise, the configuration is the same as that of FIG.

[0032]

As is apparent from the above description, according to the vehicle occupant restraint system of the present invention, in order to prevent the occupant from slipping forward from the lower portion of the seat belt when an impact such as a vehicle collision occurs, A pair of casings fixed to the left and right seat frames at the front of the seat cushion, an arm having a base end pivotally attached to the front end of the casing, a horizontal member bridged over the free ends of the left and right arms, And a power generation device which is received by at least one of the casings and drives the horizontal member to lift upward in the event of an impact such as a vehicle collision. Plate-shaped part,
A body member having an upper flange extending laterally from an upper end of the plate portion and a lower flange extending laterally in the same direction as the upper flange from a lower end of the plate portion; By having the lid members connected to the free ends of the two flanges to define a casing having a closed contour, the assembly direction is unified to the side and the ease of assembly is improved. Further, the power generating device is configured to engage at a position vertically offset from the pivot of the arm and drive the engaging portion in the front-rear direction to tilt the free end side of the arm upward, so that the plate of the main body member is tilted. By being engaged with the front and rear shoulders of the opening formed in the vertical intermediate portion of the lid portion and the vertical intermediate portion of the lid member, casing strength at the time of occurrence of an impact such as a vehicle collision is improved. Further, the power generating device has a flange provided at the front end and a cylindrical portion extending rearward from the flange, the shoulder conforming to the cylindrical contour of the cylindrical portion, and By engaging the flange, the strength of the casing when an impact such as a vehicle collision occurs is further improved. In addition, since the cover member of the casing includes a part of the seat frame, the number of parts is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main configuration of a vehicle seat device to which the present invention is applied.

FIG. 2 is an exploded perspective view showing a configuration of a sub-assembly 2 on a side provided with a power generation device of the occupant restraint device to which the present invention is applied.

FIG. 3 is a side view of the sub-assembly 2 of FIG. 2 as viewed from the outside.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an exploded perspective view showing a configuration of a left sub-assembly 3 without a power generation device of the occupant restraint device to which the present invention is applied.

FIG. 6 is a side view of the sub-assembly 3 of FIG. 5 as viewed from the outside.

FIG. 7 is a cross-sectional view showing a structure of a power generation device of the occupant restraint device to which the present invention is applied.

FIG. 8 is a view similar to FIG. 5, showing a modification of the sub-assembly without a power generation device.

FIG. 9 is a view similar to FIG. 5, illustrating a modified example of a subassembly without a power generation device.

FIG. 10 is a view of the sub-assembly of FIG. 9 as viewed from below.

FIG. 11 is a perspective view showing a main configuration of a vehicle seat device according to another embodiment to which the present invention is applied.

FIG. 12 is a perspective view showing a main configuration of a vehicle seat device according to still another embodiment to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle seat 1a Seat cushion part 1b Seat back part 2, 3 Subassembly 4 Seat frame 5 Cushion member 6 Casing 7 Body member 7a Plate part 7b Flange 8 Lid member 9 Claw 10 Hole 11 Arm 11a Upper surface part 11b Side surface part 12 , 13 hole 14, 15 long hole 16, 17 opening 18 hole 19 long hole 20 pipe support portion 21 intermediate bent portion 22 power generation device 22a flange 23 piston rod 23a annular tip portion 23b engagement uneven portion 24 one-way lock mechanism 25 collar 25a Enlarged head 26 Bolt 27 Rubber ring 28 Hole 29 Bolt 30 Pin 31 Retainer ring 32 Pipe 36 Casing 37 Body member 38 Cover member 39 Claw 40 Hole 41 Arm 41a Upper surface portion 41b Side surface portion 42, 43 Hole 44, 45 Holes 46, 47 Openings 48 Holes 49 Long Holes 50 Pipe Supports 51 Intermediate Bends 53 Rods 53a Annular Tip 54 One-way Lock Mechanism 55 Collar 55a Extended Head 56 Bolts 57 Rubber Rings 58 Holes 59 Bolts 60 Pins 61 Retainer Rings 71 Pistons Main body 72 Cylinder 73 Gas generator 74 Seal member 75 Compression coil spring 76 Casing 77 Tapered portion 78 Engagement piece 79 Spring 80 Engagement unevenness 82 Base plate 83 Arm 84 Main body member 84a Plate portion 84b Flange 84c Support piece 85 Cover member 86 Pin 87 Collar 88 Bolt 89 Hole 90 Bolt 91 Spacer 92 One-way lock mechanism 93 Ratchet tooth 94 Ratchet claw member 95 Torsion coil spring 107 Body member 107a Plate portion 108 Lid

Claims (4)

[Claims] A pair of casings fixed to left and right seat frames at a front portion of a seat cushion to prevent an occupant from slipping forward from a lower portion of a seat belt when an impact such as a vehicle collision occurs. An arm having a base end pivotally attached to a front end of the casing, a lateral member bridged over the free ends of the left and right arms, and the lateral member received by at least one of the left and right casings when an impact such as a vehicle collision occurs. An occupant restraint device comprising: a power generation device that drives the device to lift the device upward, wherein the casing is long in the front-rear direction, is a plate-shaped portion extending vertically, and laterally extending from an upper end of the plate-shaped portion. A body member having an extending upper flange and a lower flange extending laterally in the same direction as the upper flange from a lower end of the plate-shaped portion; and closing in cooperation with the body member. Occupant restraint system, characterized in that it comprises a cover member coupled to said flanges free end so as to define the outline of the casing. 2. The arm generating device according to claim 1, wherein the power generation device is engaged with a position vertically offset from a pivot of the arm and drives the engagement portion in the front-rear direction to tilt the free end of the arm upward. Wherein the power generating device is engaged with shoulder surfaces before and after an opening formed in a vertical intermediate portion of the plate-shaped portion of the main body member and a vertical intermediate portion of the lid member. The occupant restraint device according to claim 1, wherein 3. The power generating device includes a flange provided at a front end and a cylindrical portion extending rearward from the flange, wherein the shoulder has a cylindrical contour of the cylindrical portion. 3. The occupant restraint system of claim 2, wherein the occupant restraint is adapted and adapted to engage the flange. 4. The casing according to claim 1, wherein the cover member includes a part of the seat frame.
The occupant restraint device according to claim 3.