JP2003291704A - Shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorber capable of sufficiently exerting binding force in emergency while securing a cushion property. <P>SOLUTION: A space part 5a is formed in a cushion part 5 supported by a cushion support part 4. A bag body 10 with an auxiliary cushion material housed inside by forming an opening part is disposed in the space part 5a. An opening-closing mechanism 20 is installed in the opening part. A gas feeding device 30 for feeding gas is installed in the bag body 10. The opening and closing of the opening-closing mechanism 20 and the gas feed of the feeding device 30 are controlled by a control means 40. The cushion property is secured by allowing collapse and restoration of the bag body 10 by opening the opening- closing mechanism 20 in normal time. In abnormal time, the opening-closing mechanism 20 is closed and the gas is fed from the feeding device 30 to the bag body 10, so that the bag body 10 is prevented from being easily collapsed by expanding it in a gas-filled state and the binding force of an occupant is enhanced. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber capable of controlling deformation of a cushion portion.

[0002]

2. Description of the Related Art In the case of a frontal collision of an automobile, even when an occupant is wearing a seat belt, a so-called so-called submarine phenomenon occurs in which the occupant moves under the lap belt restraining the waist and moves forward. It is known that this may occur.

In order to prevent such a submarine phenomenon and securely restrain the occupant with a seat belt, conventionally, there has been proposed one in which a cushion material of a seat cushion is lifted to restrain the occupant at the time of a collision. For example, Japanese Unexamined Patent Application Publication No. 2001-239872 discloses an inflatable body that is inflated by gas and is arranged between a cushion material of a seat and a seat bottom.

[0004]

However, when the inflatable body is provided between the cushion material and the seat bottom portion which is the reaction surface, the cushion material is formed to have a required thickness in order to secure the sitting comfort. Since the inflatable body is arranged in series, when the occupant moves during a collision, sufficient reaction force for restraining the occupant cannot be obtained until the cushion material is completely crushed.

Further, the occupant weight acts on the inflatable body in a folded state, and a large-capacity gas generator is required to expand and inflate the inflatable body in this state, and the inflatable body is completely inflated. It takes time to deploy, and passenger restraint is delayed by that amount.

On the other hand, in Japanese Patent Laid-Open No. 2001-211956, a ventilation window is formed in a pan frame provided on the back side of a breathable seat pad, and the seat area is changed by adjusting the opening area of the ventilation window. However, this technology aims to control the vibration transmission characteristics arbitrarily by varying the ventilation volume between the entire seat pad and the outside, and the force that restrains the occupant moving during a collision. The effect of getting pressure can not be expected.

Therefore, the present invention provides a shock absorber capable of exhibiting sufficient restraining force in an emergency while ensuring cushioning properties.

[0008]

In the shock absorber of the present invention, a space is formed in the cushion part supported by the cushion support, and an opening is formed in at least a part of the space. Then, the bag body containing the auxiliary cushion material is arranged inside, and an opening / closing mechanism is provided in this opening and a gas supply device for supplying gas to the bag body is provided. The opening / closing mechanism and the gas supply device are controlled by the control means. The configuration is

[0009]

According to the present invention, since air is freely ventilated into and out of the bag when the opening / closing mechanism provided in the opening of the bag is open, the bag follows the deformation of the cushion portion. It becomes easier to crush and restore, and the original cushion function can be exhibited.

On the other hand, in an emergency, the control means closes the opening / closing mechanism, and gas is supplied from the gas supply device, so that the bag body is instantly inflated by the gas pressure in a sealed state. The deformation of the cushion part is restricted.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 12 show a first embodiment of a shock absorber according to the present invention, FIG. 1 is a perspective view of a vehicle seat in which the shock absorber is applied to a seat cushion, and FIG. 2 is a shock absorber. Sectional perspective view of the applied seat cushion, FIG.
4 is a perspective view of the bag body in a stored state, FIG. 4 is a perspective view of the bag body in an inflated state, FIG. 5 is an exploded perspective view of the bag body, an opening / closing mechanism and a gas supply device, and FIG. 6 is an exploded view of the opening / closing mechanism and the gas supply device. FIG. 7 is a perspective view, FIG. 7 is a sectional view of the bag body and the opening / closing mechanism, FIG. 8 is a block diagram showing a control circuit of the opening / closing mechanism and the gas supply device, FIG. 9 is a sectional view showing a non-operating state of the bag body, and FIG. 10 is a bag. 11 is a sectional view showing an operating state of the body, FIG. 11 is a sectional view showing a non-operating state of the seat cushion to which the shock absorber is applied, and FIG. 12 is a sectional view showing the operating state.

FIG. 1 shows a vehicle seat 1. The vehicle seat 1 includes a seat cushion 2 that serves as a seating surface and a seat back 3 that serves as a backrest portion. In the first embodiment, a shock absorber is provided. Is applied to the seat cushion 2.

As shown in FIG. 2, the seat cushion 2 has a seat cushion member 5 as a cushion portion having a predetermined thickness placed and fixed on a pan frame 4 as a cushion support portion. The shape is maintained by the pan frame 4 and the seat cushion material 5 is covered with a seat skin 6 to provide a schematic configuration.

Then, a space 5a is formed by hollowing out a portion corresponding to the thigh from the pelvis of the seated occupant, that is, a substantially central portion of the seat cushion material 5, and the bag 10 is housed in the space 5a. It is arranged.

The space portion 5a may be formed by penetrating the seat cushion material 5, and in consideration of the continuity of the seating surface (upper side surface), the seat cushion material 5 has a predetermined thickness above the space portion 5a. The remaining seat cushion material 5 may cover the upper surface of the bag body 10.

As shown in FIGS. 3 and 4, the bag body 10 is fused or sewn with a flexible film having airtightness such as vinyl or canvas cloth as a material so as to have an inner shape of the space 5a. It is formed in a substantially rectangular parallelepiped bag shape.

On the inner side of the bag body 10, there are installed, at the substantially central portion in the front-rear direction and at the central portion in the left-right direction rearward of the central portion, respectively, separated film formations 11 and 12 made of the same material. , 12 partition the inside of the bag body 10 back and forth and the rear part left and right to form three chambers 10a, 10b, 10
c, and each of these rooms 10a-1 is separated as shown in FIG.
Auxiliary cushion materials 13a, 13b 13c are housed in 0c.

The room 10a is the remaining room 10b, 10
Located on the front side of c, when this room 10a expands,
The volume is formed larger than the auxiliary cushion material 13a housed inside, and the surplus portion 10d having the larger volume is stored in a folded state.

Further, the auxiliary cushion materials 13a to 13
Each of the chambers 10a to 10c, particularly the chamber 10a, is formed in a shape substantially equal to the inner shape of each room with the surplus portion 10d folded.

An opening 14 is formed on the lower surface of the bag body 10 and a bag body base frame 15 is attached to the bag body base frame 15. , 12 are arranged along the lower end edges of the bags 14 to form the frame of the opening 14, and the lower shape of the bag 10 is fixed by the bag base frame 15.

The number of divisions inside the bag body 10 is not limited to three, and may be any appropriately selected plural number. In that case, the shape of the bag body base 15 defines the inside of the bag body 10. It is determined according to the shape of the lower edge of the separated film formation.

Bag base frame 1 for fixing the opening 14
5, an opening / closing mechanism 20 is provided as shown in FIG. 5, and a gas supply device 30 for supplying gas to the bag body 10 is provided in the opening / closing mechanism 20.

A hatched portion K attached to the upper surface of the opening / closing mechanism 20 in the figure is an adhesive portion of the bag base frame 15.

As shown in FIG. 6, the opening / closing mechanism 20 includes a fixed lattice 21 directly fixed to the pan frame 4, a cushion material support lattice 22 mounted above the fixed lattice 21 at regular intervals, and these fixed lattices 21. And a cushion member support grid 22 and a slide grid 23 inserted so as to be relatively movable.

An opening portion (not shown) is formed in a portion of the bread frame 4 to which the opening / closing mechanism 20 is attached so that the lower portion of the bread frame 4 and the opening portion 14 of the bag body 10 are communicated with each other.

Further, the cushion support grid 22 has a function of supporting the cushion members 13a to 13c housed inside the bag body 10, and even when the load of the occupant acts from above the bag body 10. 13a to 13c are prevented from contacting the slide grating 23.

An outer peripheral wall 24 is airtightly surrounded between the outer peripheries of the fixed lattice 21 and the cushion material supporting lattice 22, and an insertion port 24a formed on the front side of the outer peripheral wall 24.
The slide grid 23 is inserted between the fixed grid 21 and the cushion material support grid 22, and the slide grid 23 slides in close contact with the upper surface of the fixed grid 21.

The outside of the insertion port 24a is closed by inserting the slide grating 23 and then inserting the ventilation member 25, and fixing the ventilation member 25 to the insertion port 24a.

As shown in FIG. 7, the fixed grid 21 is provided with two rows of grid-shaped openings 21a, 21a, ... Formed at predetermined intervals in the front-rear direction on the left and right sides, and on the cushion support grid 22. ... form substantially the same grid-like openings 22a, 22a ... As the grid-like openings 21a, 21a ... Of the fixed grid 21 with the same pitch and the same row, and these grid-like openings 21a, 21a.
a, 22a ... Communicate corresponding to each other in the vertical direction.

As shown in FIG. 7, the front-rear direction opening width w1 of the grid-like openings 21a, 21a ... Of the fixed grid 21 and the non-opening width w2 between the openings 21a, 21a.
Are formed equally, the relationship between the opening width w1 and the non-opening portion width w2 may be set so that at least the opening width w1 is smaller than the non-opening portion width w2 (w1 ≦ w2).

The grid-shaped openings 21a of the fixed grid 21,
21a ... and the lattice-shaped opening 22 of the cushion support lattice 22
.. do not necessarily have the same pitch or the same opening shape when a space is provided between the cushion support grid 22 and the slide grid 23 to facilitate air circulation.

The sliding grid 23 has an opening width w equal to the grid-like openings 21a, 21a ... Of the fixed grid 21.
Grid-like openings 23a, 23a with a pitch equal to 1
Are formed, and of course, these lattice-shaped openings 23a,
23a ... Are formed in two rows on the left and right sides.

Therefore, the relative sliding positions of the grid-like openings 21a, 21a ... Of the fixed grid 21 and the grid-like openings 23a, 23a ... Of the slide grid 23, which are formed with the same opening width w1 and the same pitch, respectively. Thus, the opening 14 of the bag 10 can be opened and closed.

Engagement grooves 23b are formed on both sides of the rear end of the slide grid 23. The engagement grooves 23b are formed on the upper surface of the rear end of the fixed grid 21 and the lower surface of the rear end of the cushion support grid 22, respectively. By engaging the formed locking projections 21b and 22b, the slide grating 23 is positioned with a predetermined blocking force.

Incidentally, the engaging groove 23b and the locking projection 21
In the positioning state in which b and 22b are engaged, the fixed grid 21
, And the grid-shaped openings 23a, 23a of the slide grid 23 are in communication with each other, and the opening 14 of the bag body 10 is open.

On the other hand, as shown in FIG. 6, a piston 23d is provided at the tip of a stay 23c protruding from the center of the front end of the slide grid 23. The piston 23d is slid on a cylinder 25a formed on the ventilation member 25. It is fitted so that it can move.

That is, the cylinder 25a is formed so as to penetrate in the front-rear direction inside the thick portion 25b formed in the central portion of the ventilation member 25 as shown in FIG.
The cylinder 25a and the bag body 1 are provided on the upper surface of the rear end portion 5b.
A communication port 25c that connects the room 10a in front of 0 is formed.

The piston 23 for the cylinder 25a
As for the positional relationship of d, in the initial state in which the grid-shaped openings 21a, 21a of the fixed grid 21 and the grid-shaped openings 23a, 23a of the slide grid 23 are in communication with each other as shown in FIG. Located in front of the communication port 25c, on the other hand, as shown in FIG. 10, the slide grid 23 is pushed in to open the openings 21a, 21a of the fixed grid 21.
The piston 23d is located rearward of the communication port 25c in a state in which is blocked by the slide grating 23.

Fixed grid 21 and cushion support grid 2
In the center of the front end portion of 2, the notch portions 21c and 22c for fitting the thick portion 25b formed in the ventilation member 25 are formed, and in the state where the thick portion 25b is fitted to the notch portions 21c and 22c, The upper and lower surfaces of the fixed grid 21 and the cushion support grid 22 are flat surfaces.

As shown in FIGS. 5 and 6, the gas supply device 30 is constructed as a gas cylinder filled with high-pressure gas, and the gas supply device 30 is connected to the tip end portion by a command signal from the control means 40 shown in FIG. Gas is ejected from the nozzle 31.

A male screw portion 32 is formed at the tip of the gas supply device 30, and this male screw portion 32 is connected to the cylinder 2.
The gas supply device 30 is attached to the ventilation member 25 by being screwed into the female screw portion 25d formed at the tip of the 5a.

As shown in FIG. 8, the control means 40 outputs a signal for opening the nozzle 31 of the gas supply device 30 in response to a signal that the collision detection means 41 has detected a vehicle collision (frontal collision). To do.

That is, in this embodiment, the gas supply device 30 is operated by the control means 40, so that the piston 23 is operated by the gas pressure supplied from the gas supply device 30.
By pushing d to the rear of the cylinder 25a, the gas pressure serves as a driving source to operate the opening / closing mechanism 20, while the piston 23d is pushed to communicate the communication port 2
5c is opened to supply gas pressure to the room 10a of the bag body 10.

In the seat cushion 2 of the vehicle seat 1 of the present embodiment having the above-described structure, in the normal non-collision state, the opening / closing mechanism 20 has the grid-like openings 21a of the fixed grid 21, as shown in FIG. 21a ... and the grid-like openings 23a, 23a of the slide grid 23 coincide with each other, and the opening 14 is in an open state.
When the bag is deformed, the bag body 10 can freely ventilate inside and outside, and in this state, the bag body 10 can follow the deformation of the seat cushion material 5 to be easily crushed and restored, and exert its original cushion function. You can

At this time, since the bag body 10 is bent due to the compression-restoration characteristic of the accommodated auxiliary cushion materials 13a to 13c, for example, the auxiliary cushion materials 13a to 13c are used as the bag body 1.
By forming the same material as the seat cushion material 5 around 0, the seat cushion 2 as a whole including the bag body 10 exhibits the same cushioning performance, and a comfortable sitting comfort is achieved.

On the other hand, in the event of a frontal collision of the vehicle, the collision detection signal from the collision detection means 41 shown in FIG. 8 is input and the control means 40 causes the nozzle 31 of the gas supply device 30 to supply the high pressure gas to the cylinder of the ventilation member 25. Ejects into 25a.

Then, the piston 23 of the slide grating 23
The opening / closing mechanism 20 operates by d being released from the engagement between the engagement groove 23b and the locking protrusions 21b and 22b, and the non-opening width of the grid-shaped openings 21a, 21a ... Of the fixed grid 21. The grid-shaped opening 2 of the slide grid 23 is provided on the w2 portion.
3a, 23a ... Overlap and the opening part 14 will be in a closed state.

Therefore, the fixed grid 21 and the sliding grid 2
Even if air leaks from a slight gap in the closed part of 3,
The ventilation resistance becomes significantly large, and the bag body 10 becomes difficult to be crushed regardless of the crushing characteristics of the auxiliary cushion materials 13a to 13c, so that the reaction force from the pan frame 4 is transmitted to the occupant from a time when the occupant is little moved. Thus, when the seat belt is worn, the occupant can be restrained by preventing the submarine phenomenon in which the occupant tries to pass through the underside of the lap belt.

Further, the piston 23d is pushed in by the gas pressure, so that the inside of the cylinder 25a has a communication port 25c.
To communicate with the room 10a on the front side of the bag body 10 via
The high-pressure gas of the gas supply device 30 ejected into the cylinder 25a is supplied to the room 10a.

Therefore, in the state shown in FIG. 12 in which the gas pressure is supplied from the gas supply device 30 from the normal state shown in FIG. 11, the room 10a of the bag body 10 is inflated by the gas pressure, and the surplus folded up. The portion 10d expands and inflates, and the occupant M
It is possible to protect the occupant M by flipping up the lower limb Mf and preventing or mitigating the interference between the vehicle body interior parts located in front of the lower limb Mf and the occupant lower limb Mf.

Further, when the bag body 10 receives an occupant's attempt to sink into the seat cushion 2 due to a collision, the occupant M collides due to ventilation resistance when the air in the bag body 10 leaks from the gap. Since the energy can be absorbed, the occupant M can be restrained without forcing a high deceleration on muscles and skeletons. At this time, the collision energy can also be absorbed by the deformation of the pan frame 4, which is the reaction surface.

As described above, according to the first embodiment,
When the opening / closing mechanism 20 provided in the opening 14 of the bag body 10 is open, air is freely ventilated into and out of the bag body 10, so that the bag body 10 follows the deformation of the cushion portion 5 and is crushed or restored. And the original cushioning function can be exerted, while in an emergency, the control means 40 closes the opening / closing mechanism 20 and the gas supply device 30.
By supplying gas from the bag body 10, the bag body 10 is instantly inflated by the gas pressure in a sealed state, and the inflated bag body 1
With 0, the deformation of the cushion portion 5 can be restricted.

Therefore, when this is applied to the seat cushion 2 of the vehicle seat, the space portion formed in the cushion portion 5 having the required thickness existing between the pan frame 4 which is the reaction surface and the seated person. 5a can be changed into a space having a characteristic of being difficult to be crushed in an emergency to enhance the restraining force of the seated person, and the load of the seated person acts on the bag 10
When compressed, the air flow resistance when gas leaks from the gap of the opening / closing mechanism 20 and the deformation of the pan frame 4 can effectively absorb the moving energy acting on the seated person.

Further, since the control means 40 operates the opening / closing mechanism 20 and the gas supply device 30 based on the detection signal of the vehicle collision, it is possible to perform quick operation control and enhance the restraint of the seated person. Since the bag body 10 is inflated by the gas pressure generated by the gas supply device 30 and the opening / closing mechanism 20 is closed, these operations can be performed in synchronization and the restraint can be further enhanced.

Further, the bag body 10 has a plurality of chambers 10a inside.
Since it is divided into 10 to 10c, when one part of the bag body 10 is intensively compressed, it is possible to prevent the other part from expanding and the internal pressure being dispersed, so that the seated person tries to move. The seated person can be more surely restrained by resisting the force exerted. In addition, the front room 10a has an auxiliary cushion material 13
Since the volume is made larger than that of a and the folded surplus portion 10d can be inflated and expanded by gas pressure to bounce up the lower limb of the seated person, interference between the vehicle body interior parts located in front of it and the lower limb of the occupant can be prevented. Can be prevented.

13 to 15 show a second embodiment of the present invention, and the same components as those of the above-mentioned embodiment will be designated by the same reference numerals and overlapping description will be omitted.

FIG. 13 is a perspective view showing the bag body taken out, FIG.
4 is a cross-sectional perspective view of an essential part showing a non-actuated state of a seat cushion to which a shock absorber is applied, and FIG. 15 is a cross-sectional perspective view of an essential part showing an actuated state of the bag body 10 of the second embodiment. An air belt 50 as a flexible restraint member is attached to the upper part of the front side, which is the side that moves when a frontal collision of the vehicle occurs, as shown in FIG. 13, under the condition that the control means 40 shown in the embodiment operates. Through the bag 1
0 is constrained to the pan frame 4 serving as a cushion support portion.

The air belt 50 is formed by forming a flexible film such as a canvas cloth having airtightness into a bag-like shape so that the base end portion 51 of the air belt 50 is opened to the bag body 10 and the tip end portion 52 is formed. The air belt 50 is hermetically sealed and the length thereof is reduced by expanding the inside of the air belt 50 by gas pressure.

A pair of the air belts 50 are provided, and each of the air belts 50 has a base end portion 51 which is opened as shown in FIG. 10 and is located on the left and right sides of the upper front portion of the bag body 10 and communicates with the front room 10a. The anchor portions 53 provided on the front end portion 51 of the air belt 50 are fixed to the rear side portions of the pan frame 4 in a tensioned state as shown in FIG.

Of course, in the second embodiment, as in the first embodiment, the gas supply device 30 is operated by the control means 40 based on the collision detection to eject the high pressure gas,
The opening / closing mechanism 20 is shut off by this gas pressure, while the chamber 10a of the bag body 10 is inflated.

Therefore, in the second embodiment, the same function as that of the seat cushion 2 of the first embodiment can be obtained, and the bag body 10 which is hard to be crushed by the collision of the vehicle.
When the passenger tries to move forward with the occupant, since the front side of the bag body 10 is restrained by the pan frame 4 by the air belt 50, the forward movement of the bag body 10 is blocked and the forward movement of the occupant can be suppressed. it can.

In particular, since the air belt 50 is used as the flexible restraint member in the second embodiment, as shown in FIG. 15, the air belt 50 communicating with the room 10a is expanded inward as the room 10a expands. Since the gas pressure is also supplied, the inflatable belt 50 is inflated and its length is reduced, and the force for restraining the bag body 10 that is difficult to be crushed rearward can be further increased.

Of course, even in this case, the force for restraining the bag body 10, that is, the force for restraining the occupant is transmitted to the rear both sides of the pan frame 4, and the reaction force of the pan frame 4 is utilized to make a collision. It can absorb energy effectively.

The shock absorber of this embodiment has been described by taking the first and second embodiments as an example. However, the present invention is not limited to this, and various embodiments are possible without departing from the gist of the present invention. For example, the shock absorber of the present invention is not limited to the vehicle seat 1 and can be used as a cushion for protecting luggage during transportation.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle seat in which a shock absorber according to a first embodiment of the present invention is applied to a seat cushion.

FIG. 2 is a sectional perspective view of a seat cushion to which the shock absorber according to the first embodiment of the present invention is applied.

FIG. 3 is a perspective view of the bag according to the first embodiment of the present invention in a stored state.

FIG. 4 is a perspective view of the bag according to the first embodiment of the present invention in an inflated state.

FIG. 5 is an exploded perspective view of the bag body, the opening / closing mechanism, and the gas supply device according to the first embodiment of the present invention.

FIG. 6 is an exploded perspective view of an opening / closing mechanism and a gas supply device according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional view of the bag body and the opening / closing mechanism according to the first embodiment of the present invention.

FIG. 8 is a block diagram showing a control circuit of the opening / closing mechanism and the gas supply device according to the first embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a non-operating state of the bag according to the first embodiment of the present invention.

FIG. 10 is a sectional view showing an operating state of the bag according to the first embodiment of the present invention.

FIG. 11 is a sectional view showing a non-operating state of the seat cushion to which the shock absorber according to the first embodiment of the present invention is applied.

FIG. 12 is a sectional view showing an operating state of the seat cushion of FIG.

FIG. 13 is a perspective view showing a bag body according to a second embodiment of the present invention as taken out.

FIG. 14 is a cross-sectional perspective view of essential parts showing a non-operating state of the seat cushion to which the shock absorber according to the second embodiment of the present invention is applied.

15 is a cross-sectional perspective view of essential parts showing an operating state of the seat cushion of FIG.

[Explanation of symbols]

1 Vehicle seat 2 Seat cushion (shock absorber) 4 Pan frame (cushion support) 5 Seat cushion material (cushion part) 5a space part 10 bags 10d surplus part 20 open / close mechanism 30 gas supply device 40 control means 50 Air belt (flexible restraint member)

Claims (7)

[Claims] 1. A bag body having a cushion part supported by the cushion support part, wherein a space part is formed, and an opening part is formed in at least a part of the space part to accommodate an auxiliary cushion material therein. A shock absorber characterized in that an opening / closing mechanism is provided at the opening, a gas supply device for supplying gas to the bag is provided, and a control means for controlling the opening / closing mechanism and the gas supply device is provided. 2. A cushion portion is provided on the vehicle,
The shock absorber according to claim 1, wherein the control means operates the opening / closing mechanism and the gas supply device based on a detection signal of a vehicle collision. 3. The shock absorber according to claim 1, wherein the gas pressure generated in the gas supply device is used as an opening / closing drive source of the opening / closing mechanism while expanding the bag body. 4. The bag body is formed to have a larger volume than the auxiliary cushioning material housed inside, and an excess portion of the volume is folded and stored in a non-supply state of gas. The impact absorber according to any one of to 3. 5. The bag body is constrained to a cushion support portion via a flexible constraining member on a side that moves under a condition in which the control means operates, according to any one of claims 1 to 4. The shock absorber described. 6. The shock absorber according to claim 5, wherein the flexible restraint member is an air belt whose length is reduced as the gas pressure in the bag body is introduced and the bag is inflated. 7. The cushion portion is provided on a seat cushion of a vehicle seat.
The shock absorber according to any one of 1.