JPH076018Y2 - Vehicle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a vehicle seat equipped with a suspension device that is mainly installed and used in a driver's seat of a large truck or the like. The present invention relates to a vehicle seat called a belt-in suspension seat or the like in which a seat belt attachment portion is provided on an upper frame.

(Prior Art) Conventionally, in a vehicle seat provided with the above-mentioned suspension device, when a seat belt for restraining a seated person is worn, the lower end of the belt is connected to an upper frame (seat cushion frame) of the suspension device. Then, the suspension device may not be able to withstand the tensile force of a large impact load input from the belt at the time of collision due to insufficient strength, and the suspension device may fall forward or be destroyed. For this reason, the lower end of the seat belt must be attached directly to the floor of the vehicle body. However, in such a case, the seat belt regulates the seated person in a constant tension state regardless of the change of the seat cushion, which hinders the vertical movement (suspension effect) of the seat cushion and the front-back slide adjustment, resulting in uncomfortable seating. turn into.

For the purpose of solving these problems, for example, Jikho Sho 57-1572
The proposal shown in Japanese Patent No. 9 is already known. This proposal is for the floor mounting part (lower frame) of the suspension device.
A belt-shaped flexible member having flexible high tension is connected between the seat belt attachment portion (upper frame) of the seat and the seat. The flexible member is usually in a state of being appropriately loosened so as not to interfere with the vertical cushioning action of the suspension device, and when the suspension device receives a large upward pulling force from the seat belt at the time of a collision, the flexible member becomes tense only when the suspension device is fully extended. Sufficiently resist the upward pulling force. With this, the suspension device is reinforced against the upward pulling force at the time of collision to prevent the vehicle from tilting forward or breaking.

(Problems to be solved by the invention) By the way, even if the strip-shaped flexible member is provided as described above,
In the actual situation, it does not help much to prevent the suspension device from being pushed forward or destroyed during an actual collision. That is, the flexible member is usually in a state of being appropriately loosened so as not to interfere with the vertical cushioning action of the suspension device, and it is only when the suspension device is fully extended by a large pulling force from the seat belt to the front diagonally upward direction at the time of a collision. Since the flexure member is tense and resists the tensile force, acceleration is applied in the meantime and the pulling force becomes excessive, and the flexure member cannot withstand this, and the suspension device is pushed forward or destroyed. I will wake you up. In addition, when a large impact load is suddenly applied, there is no room for the suspension device to extend upward until the bending member is tense, and the tension force from the seat belt causes excessive bending at the crossing center point of the X-link of the suspension device. A moment is generated, and the upper half of the suspension device is tilted forward and destroyed with the intersection center point as the center of rotation.

The present invention has been made in view of the above conventional circumstances, and the suspension device can be easily and effectively reinforced, and even in the belt-in system in which the lower end of the seat belt is attached to the seat cushion side, it is possible to quickly respond to the impact load input at the time of a collision. It is an object of the present invention to provide a vehicle seat with excellent safety that can surely prevent the suspension device from being tilted forward or destroyed.

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above object, the vehicle seat of the present invention is
A shaft is rotatably provided at a rear portion of an upper frame of the suspension device, a lock member is provided on the shaft, and a eccentric position of the lock member from the shaft or a crank provided on the shaft separately from the lock member. A lower end of the seat belt is connected to an eccentric position of the lever from the shaft, and on the other hand, a fixed guide member that guides the shaft in a vertically movable manner and can be locked by a lock member at the time of a collision is provided on the floor of the vehicle body or the lower frame of the suspension device. It is characterized in that a shaft anti-rotation member is provided which is erected from the fixed portion and prevents the lock member from being locked to the fixed guide member unless a large pulling force due to the collision acts.

The fixed guide member is configured to have a vertically elongated hole that guides the shaft in a vertically movable manner, and the lock member is configured to abruptly rotate together with the shaft so as to be caught and locked in the front and rear surfaces in the vertically elongated hole. Is desirable.

The fixed guide member has a vertically elongated guide rail shape, and the lock member has a shape that surrounds the outer periphery of the rail-shaped fixed guide member with a gap and rapidly rotates together with the shaft so that the fixed guide member is fixed to the fixed guide member. It is desirable to have a structure that can be hooked from the front and back.

When the shaft is provided in the rear portion of the upper frame of the suspension device in a non-rotatable state, a substantially U-shaped holder attached to the shaft and surrounding the outer periphery of the fixed guide member excluding the front side, A lock member is constituted by a rotation cam pivotally supported on the open end side of the holder, and the seat belt lower end is connected to the end of the rotation cam of the lock member on the side opposite to the fixed guide member, so that the seat belt can be separated from the seat belt at the time of a collision. A structure for preventing the suspension device from tilting forward and breaking by pulling the holder forward by the rotation of the rotating cam by the input pulling force and immediately hooking the holder in a state of being sandwiched by the fixed guide member from the front and rear. On the other hand, unless a large pulling force is applied due to the collision, a rotation prevention cam and a cam detent member for preventing the holder from being locked to the fixed guide member are provided. .

(Operation) With the above configuration, in normal times, the shaft provided on the upper frame side of the suspension device is vertically movably guided by the fixed guide member standing from the fixed portion such as the lower frame, and further, the shaft or Since the rotation of the rotation cam is restricted and the lock member provided on the shaft can move up and down without being locked to the fixed guide member, it does not hinder the vertical movement buffering action of the suspension device. Instead, the suspension device absorbs and alleviates vertical shocks and vibrations of the seat cushion during normal traveling.

Then, in the event of an actual collision, a large impact load is suddenly generated on the seat belt as a pulling force obliquely upward to the front side, and this large pulling force swiftly pushes the detent member to rotate the shaft or the rotating cam. Move
The lock member immediately engages with the fixed guide member. As a result, a large resistance force is quickly exerted before the suspension device is fully extended (before the tensile force is excessively increased due to acceleration), so that the suspension device is surely prevented from being tilted or broken.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 2, 1 is a seat cushion, 2 is a seat back, 3 is a suspension device for supporting the seat cushion 1 from below, 4 is not the floor of the vehicle body, but the frame of the seat cushion 1 (a shaft provided in an upper frame described later). ) Side is a seat belt whose lower end is attached.

The suspension device 3 is of an X-link type, and includes a lower frame 5 mounted and fixed on the floor surface of the vehicle body and an upper frame 6 for mounting and fixing the seat cushion 1 on the upper side.
And a pair of left and right X-link mechanisms 7 and a buffer spring and a damper (not shown) that are connected so as to be interposed between the lower frame 5 and the upper frame 6.
The link mechanism 7 guides and supports the seat cushion 1 so that the seat cushion 1 can move up and down, and the shock and vibration in the vertical direction acting on the seat cushion 1 via the X-link mechanism 7 during normal traveling are absorbed and alleviated by buffer springs and dampers. It has become.

Here, a state in which a shaft 8 formed of a single long round pipe extends in the left-right direction at the rear portion of the upper frame 6 of the suspension device 3 which is the frame of the seat cushion 1 so as to move up and down together with the upper frame 6. It is rotatably provided. That is, the shaft 8 is rotatably inserted into a pair of left and right (not shown on one side) resin bearings 9 made of resin such as nylon, as shown in FIGS.
It is attached by being held by the V-shaped mounting bracket 10 and fixed to the rear end of the upper frame 6 by the upper and lower bolts 11.

Rectangular holes 8a, 8a are formed on the left and right ends of the shaft 8 so as to face each other in the diametrical direction, and a latch-like locking member 12 is attached so as to be inserted into both the rectangular holes 8a. Further, crank levers 13 are attached to the left and right ends. As shown in FIGS. 4 and 5, the lock member 12 is formed by notching one thick steel plate into a substantially H shape and improving the hardness by heat treatment such as quenching. In addition to having edge portions 12a, 12a, guide protrusions 12b, 12b are provided on both sides of both edge portions 12a, and a retaining recess 12c is provided on one side portion. The latch-shaped lock member 12 is inserted into the engagement hole 14a of the relatively short rod-shaped insert fitting 14 inserted into the shaft 8 and the rectangular hole 8a of the shaft 8, and the insert fitting 14 is inserted in that state. By pulling outward, the retaining recess 12c
Is engaged with the insert metal fitting 14 to prevent it from coming off, and is mounted so as to rotate integrally with the shaft 8.
A chamfer parallel to the outer end of the insert fitting 14
14b is formed, a male screw portion 14c is further provided at the tip thereof, and the base end rectangular hole 13a of the crank lever 13 is fitted into the chamfered portion 14b, and the washer is attached to the male screw portion 14c from the outside.
When the nut 16 is tightened via 15, the crank lever 13 is attached so as to rotate integrally with the shaft 8 with an opening angle of about 60 degrees rearward with respect to the lock member 12.

The inner and outer anchorages of the seat belt (three-point seat belt) 4 (anchor bracket 4a on the outer side and buckle 4b on the inner side) of the seat belt (three-point seat belt) 4 are connected to the tip ends of the crank levers 13 at both ends of the shaft 8 by bolts 17, respectively.

Further, a thin plate arm-shaped shaft rotation preventing member 18 is attached to the shaft 8 by welding or the like in the middle of the shaft 8, and a bent small projecting piece portion 18a at the tip thereof is formed on a side portion of the upper frame 6. The shaft 8 is inserted into the hole 6a to regulate the rotation of the shaft 8 in normal times. Even if a rotational moment is generated in the shaft 8 via the crank lever 13 by a pulling input from the seat belt 4, the shaft anti-rotation member 18 does not deform at all under a normal input,
The bent small projecting piece 18a is deformed so that the small protruding piece portion 18a at the tip is deformed so as to be completely pushed down by a large input in the event of a collision, and is disengaged from the receiving hole 6a to allow the shaft 8 to rotate.

On the other hand, fixed guide members 19 are erected on the floor of the vehicle body at the rear left and right outer positions of the lower frame 5 of the suspension device 3 respectively by bolts 20. The left and right fixed guide members 19 are made of an L-shaped steel plate, and vertical holes 19a are vertically formed in the rising plate portion, and both end portions of the shaft 8 are loosely inserted in the vertical holes 19a so as to be vertically movable. You are being guided. Further, the latch-like lock member 12 is just arranged in the vertically elongated hole 19a, and by rotating this together with the shaft 8, the edge portions 12a, 12a at both ends thereof are caught in the front and rear surfaces in the vertically elongated hole 19a. The shaft 8 is stopped so that the vertical movement of the shaft 8 is stopped.

In addition, the bearing 9 of the shaft 8 and the receiving hole 6a of the shaft whirl-stop member 18 are oval (substantially oval),
It is configured to allow the shaft 8 to move back and forth with respect to the upper frame 6 appropriately. In other words, the shaft 8 can be smoothly moved up and down in the vertically elongated holes 19a of the fixed guide members 19 on both left and right sides without being affected by the backlash and the displacement in the front-rear direction generated in the upper frame 6 due to the poor precision of the suspension device 3 or the like. You can do it.

The operation of the above-described configuration will be described. First, when the vehicle is running in a normal state, the seat belt 4 does not apply a tensile force greater than normal braking force to the crank lever 13, so that the shaft with such a tensile force is applied. The rotation preventing member 18 does not deform at the rotational moment of 8. As a result, the rotation of the shaft 8 is restricted, and the latch member 12 also does not rotate, and the shaft 8 together with the lock member 12 is smoothly caught without getting caught in the vertically elongated hole 19a of the fixed guide member 19. Can move up and down. Therefore, the upper and lower cushioning functions of the upper frame 6 of the suspension device 3 are not hindered, and the suspension device 3 supports the seat cushion 1 on the upper portion in a correct posture in the same manner as in the conventional case, and appropriately through the pair of left and right X-link mechanisms 7. It sinks and rises and absorbs and cushions vertical shocks and vibrations that accompany traveling.

In the event of a collision such as a frontal collision, a large impact load F is generated in the seat belt 4 which restrains the seated person on the seat cushion 1 due to the inertia and moves diagonally upward to the front side. The pulling force instantly acts on the left and right crank levers 13 via the anchor bracket 4a and the inner buckle 4b. Due to the large pulling force, the rotational moment generated in the shaft 8 deforms the tip bending small projecting piece 18a of the shaft anti-rotation member 18 so that it is disengaged from the receiving hole 6a of the upper frame 6, and the shaft 8 is cranked by the crank lever 13. And latch-like locking member 12
At the same time, it rapidly rotates from the position shown in FIG. 5 (a) to the state shown in FIG. 5 (b), and this rotation causes both end edges 12a, 12 of the lock member 12 to rotate.
The a immediately digs into the longitudinal hole 19a of the fixed guide member 19 in the front-rear surface and hooks. As a result, the large impact load F is applied to the shaft 8 and the lock member 12 and the fixed guide member 19 before the suspension device 3 extends upward due to a large pulling force of the seat belt 4 at the time of collision and tends to fall forward.
Is absorbed, and further upward and forward displacement of the rear end portion of the upper frame 6 is suppressed, so that the suspension device 3 is surely prevented from falling forward or being destroyed.

Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 10. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals to simplify the description.

In this embodiment, first, as shown by reference numeral 19A, the fixed guide member is a strong truss composed of a reinforcement bracket 21 and a vertically elongated guide rail 23 which is vertically held by fixing bolts 22 to the inside of the rear portion thereof. It is considered as a structure. The fixed guide member 19A welds the lower front end of the reinforcement bracket 21 to the lower frame 5 of the suspension device 3 via the pipe 24, and the rear portion is bolted.
It is fixed upright by fixing it to the car body floor at 20. Further, the guide rail 23 of the fixed guide member 19A is made of a channel material having a U-shaped cross section and is arranged with its groove opening toward the seat side. A large number of protrusions 23a are formed.

On the other hand, lock members 12A are provided at both left and right ends of the shaft 8 so as to rotate integrally with the shaft 8. This lock member 12A is the lock member 1 of the first embodiment.
It also serves as both the crankshaft 2 and the crank lever 13, and has a U-shaped plate 25 with the front side open, and a front-down tilted state in which one side plate part is bent over this front side part and welded to the other side plate part. It has a substantially quadrangular frame shape consisting of the top plate portion 26 and both side arm portions 27 extending further forward than this, and the outer periphery of the guide rail 23 of the fixed guide member 19A is taken with a small gap. It is placed in a surrounding state. Edge portions 25a and 26a having an acute cross section are formed at the lower edge of the rear end plate portion of the U-shaped plate 25 of the lock member 12A and the rear edge of the top plate portion 26, and the lock member 12A rapidly rotates together with the shaft 8. When moved, the edge portions 25a, 2
The fixed guide member 19A has a structure in which 6a engages with the front and rear surface portions of the guide rail 23 having the small protrusions 23a so as to be hooked.

Further, both left and right ends of the shaft 8 are projected into the lock member 12A, and end caps 28 made of resin having a low friction coefficient are fitted therein, and the guide rails 23 of the fixed guide member 19A are inserted through the end caps 28. It is slidably fitted in the groove so as to be rotatable and vertically movable.

An anchor bracket (shown) on the outer side of the seat belt 4 and a buckle 4b on the inner side of the seat belt 4 are connected to the front ends of both side arm portions 27 of the left and right lock members 12A (one side not shown) of the shaft 8 by bolts 17, respectively. Has been done.

The bearing 9 made of resin such as nylon for the shaft 8 is directly fitted into the hole 6b formed in the upper frame 6. The shaft detent member 18 is joined to the shaft 8 by a thin shear pin 29 without welding.

Thus, also in the second embodiment, the same operational effect as described above can be obtained. In other words, the shaft 8
Since the rotation is restricted by the rotation preventing member 18, the lock member 12A also does not rotate, and the shaft 8 together with the lock member 12A guides the guide rail 23 of the fixed guide member 19A.
It can move up and down smoothly without getting caught in. As a result, the upper and lower cushioning functions of the upper frame 6 of the suspension device 3 are not hindered, and the suspension device 3 can be operated in the same manner as in the conventional case.
While supporting the seat cushion 1 in a correct posture on the upper part, the shock and vibration in the vertical direction can be absorbed and relaxed well.

If a collision accident such as a head-on collision occurs, a tensile force due to a large impact load F generated on the seat belt 4 and obliquely upward to the front side instantaneously acts on the lock member 12A. Due to the rotational moment generated on the shaft 8 due to this large pulling force, the tip bending small projecting piece portion 18a of the shaft anti-rotation member 18 is pushed off or the shear pin 29 is sheared, so that the shaft 8 moves together with the lock member 12A. 1
0 Quickly rotate to the state of the imaginary line, and by this rotation, both front and rear edge portions 25a, 26a of the lock member 12A immediately dig into the front and rear surface portions of the fixed guide member 19A with the small projection portion 23a of the guide rail 23. And hang it. With this, before the suspension device 3 tries to fall forward while extending upward due to the large pulling force of the seat belt 4 at the time of collision, the large shock load F is absorbed by the lock member 12A and the fixed guide member 19A, The above-described upward and forward displacement of the rear end portion of the upper frame 6 is suppressed, so that the suspension device 3 can be reliably prevented from falling forward or being destroyed.

Further, a third embodiment of the present invention will be described with reference to FIGS. 11 to 14. In this case as well, the same parts as those of the first and second embodiments are designated by the same reference numerals to simplify the description.

In this embodiment, first, as indicated by reference numeral 19B, the fixed guide member includes a reinforcement bracket 21 and a vertically elongated guide rail 30 vertically held by a bolt 22 inside the rear portion, as in the second embodiment. With a strong truss structure, pipes are mounted on the lower frame 5 of the suspension device 3.
It is vertically fixed by welding through 24 and fixing the rear part to the floor of the vehicle body with a bolt (not shown). The guide rail 30 of the fixed guide member 19B is a composite body including an outer rail 31 and an inner rail 32 fitted inside the outer rail 31, and has a generally U-shaped cross section having a groove opening toward the seat side. In addition, a large number of laterally long slit-shaped hooking holes 30a are formed on the front and rear surface portions with a small vertical spacing.

On the other hand, a relatively strong detent member 33 is welded and fixed to the shaft 8, and the U-shaped portion 33a at the front end of the detent member 33 is slidably fitted on the side frame portion of the upper frame 6 so as to move forward and backward. The shaft 8 can be appropriately moved back and forth with respect to the upper frame 6, but is prevented from rotating.

Locking members 12B are provided at the left and right ends of the shaft 8. The lock member 12B has a substantially U-shaped holder 34 made of a strip steel plate that surrounds the outer periphery of the guide rail 30 of the fixed guide member 19B except the front side, and a stepped bolt 35 on the open end side of the holder 34. It is constituted by a lever-like rotation cam 36 which is pivotally supported. The holder 34 has a claw portion 34 that is bent forward at the upper and lower edges of the rear end plate portion.
a, 34a. The rotating cam 36 has a cam surface 36a at the rear end that presses the front surface portion of the guide rail 30 when the rotating cam 36 rotates clockwise around the stepped bolt 35. Further, the rotating cam 36 has a small hole 36b at an eccentric position so that the holder 34
On the other hand, it is prevented from rotating by a thin shear pin 37 which is a cam rotation preventing member.

Further, both left and right ends of the shaft 8 are projected into the lock member 12B, and an end cap 28B made of resin having a low friction coefficient and having elasticity is fitted therein, and the fixed guide member 19B of the fixed guide member 19B is inserted through the end cap 28B. It is slidably fitted in the groove of the guide rail 30 so as to be rotatable and vertically movable.

An outer side anchor bracket (not shown) of the seat belt 4 and an inner side of the seat belt 4 are attached to the front end portion which is the end of the rotation cam 36 of the left and right lock members 12B (not shown on one side) of the shaft 8 opposite to the fixed guide member. Buckle 4b is pin
Connected by 17B.

Thus, also in the third embodiment, the same operational effect as described above can be obtained. In other words, the shaft 8
The rotation is restricted by the rotation stop member 33, and the lock member 12
The holder 34 of B is held in a state where it does not come into contact with the guide rail 30 of the fixed guide member 19B, and the rotating cam 36 is prevented from rotating by the shear pin 37.
To avoid contact with. With this lock member 12B
Together with the shaft 8, the guide rail 3 of the fixed guide member 19B
It can move up and down smoothly without getting caught in 0, does not interfere with the up-down buffering action of the upper frame 6 of the suspension device 3, and the suspension device 3 supports the seat cushion 1 on the upper part in the correct posture in the vertical direction as in the conventional case. It absorbs and relaxes the shock and vibration of the.

If a collision accident such as a head-on collision occurs, a pulling force due to a large impact load F generated on the seat belt 4 and directed obliquely upward to the front side instantaneously acts on the rotating cam 36 of the lock member 12B. Due to this large pulling force, the rotary cam 36 pushes the shear pin 37 and rotates about the stepped bolt 35, and the cam surface 36a at the rear end presses the front surface of the guide rail 30. This pressing force immediately crushes the front part of the end cap 28B against the guide rail 30 and pulls the holder 34 forward, so that the rear end vertical claws 34a and 34a of the holder 34 are hooked on the rear surface of the guide rail 30. Hook it so as to bite into the hole 30a. With this, the lock member 12B is held in a state of being sandwiched by the guide rail 30 of the fixed guide member 19B from the front and rear, and the large pulling force of the seat belt 4 at the time of the collision may cause the suspension device 3 to extend upward and fall forward. Before this, a large impact load F is absorbed by the lock member 12B and the fixed guide member 19B, and further upward and forward displacements of the rear end of the upper frame 6 are suppressed, and the suspension device 3 is tilted forward and destroyed. Will be surely prevented.

[Effect of device]

Since the present invention is configured as described above, the suspension device can be easily and effectively reinforced, and even in the belt-in system in which the lower end of the seat belt is attached to the seat cushion side, the lock member quickly responds to the impact load input at the time of a collision. As a result, it is possible to obtain an extremely safe vehicle seat that can reliably prevent the suspension device from being tilted forward or destroyed.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention,
1 is a perspective view of a main part, FIG. 2 is a schematic perspective view of the whole,
FIGS. 3 and 4 are exploded perspective views of the main part, and FIGS. 5 (a) and 5 (b) are side views in which a part of the main part is shown in section showing a state of operation in normal times and at the time of collision, and FIG. 10 to 20 show a second embodiment of the present invention. FIG. 6 is a partially cutaway perspective view of the main part, FIG. 7 is a schematic perspective view of the whole, and FIG. 8 is an exploded view of the main part. FIG. 9 is a perspective view, FIG. 9 is a plan view of an essential part partially sectioned, FIG. 10 is a sectional view taken along line XX of FIG. 9, and FIGS. 11 to 14 are third embodiments of the present invention. Fig. 11 is a partially cutaway perspective view of the main part, Fig. 12 is an exploded perspective view of the main part, Fig. 13 is a partially sectional plan view of the main part, and Fig. 14 (a). (B) is a side view showing a partially cross-sectional view of a main part showing an operating state under normal conditions and during collision. 1 ... Seat cushion, 2 ... Seat back, 3 ...
Suspension device, 4 ... Seat belt, 5 ... Lower frame, 6 ... Upper frame, 7 ... X-link mechanism, 12, 12A, 12B ... Lock member, 13 ... Crank lever, 18 ... Shaft rotation stopper Member, 19, 19A, 19B …… Fixed guide member, 19a …… Vertical hole, 23,30 …… Vertical guide rail, 34 …… Holder, 37 …… Cam detent member (shear pin).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yasuo Sato 1 623-3, Hibarigaoka, Zama City, Kanagawa Prefecture Kunimatsu Industry Co., Ltd.

Claims (4)

[Scope of utility model registration request] 1. A shaft is rotatably provided at a rear portion of an upper frame of a suspension device, a lock member is provided on the shaft, and the lock member is provided at an eccentric position from the shaft or separately from the lock member. A lower end of the seat belt is connected to an eccentric position of a crank lever provided on the shaft, and a fixed guide member that guides the shaft up and down and locks a lock member in the event of a collision is provided on the vehicle floor or the suspension device. And a shaft anti-rotation member that prevents the lock member from being locked to the fixed guide member unless a large pulling force is applied due to the collision. Vehicle seat. 2. The vehicle seat according to claim 1 of the utility model registration, wherein the fixed guide member has a vertically elongated hole for vertically moving the shaft, and the lock member rapidly rotates together with the shaft. In the vehicle seat, the front and rear surfaces are bite and hooked in the vertically elongated hole. 3. The vehicle seat according to claim 1 of the utility model registration, wherein the fixed guide member has a vertically long guide rail shape, and the lock member takes the outer periphery of the rail shaped fixed guide member with a gap. A vehicle seat having a surrounding shape and being configured to engage with the fixed guide member from the front and rear by rapidly rotating together with a shaft. 4. A vertical shock is applied to the lower part of the seat cushion.
In a vehicle seat equipped with a suspension device for absorbing and absorbing vibration, a shaft is provided at a rear portion of an upper frame of the suspension device, and a fixed guide member for guiding the shaft vertically is provided on a floor of the vehicle body or the suspension device. A substantially U-shaped holder that is erected from a fixed portion such as a frame and is attached to the shaft and surrounds the outer periphery of the fixed guide member excluding the front surface side, and is pivotally supported on the open end side of the holder. A lock member composed of a rotation cam is provided, and a lower end of the seat belt is connected to an end of the rotation cam on the side opposite to the fixed guide member of the rotation cam, and the rotation cam is operated by a pulling force input from the seat belt at the time of collision. When the holder is rotated, the holder is pulled forward and immediately held in a state of being sandwiched between the fixed guide member from the front and the rear by the suspension. In addition to preventing the device from tipping or breaking, it is also provided with a cam rotation stopping member that prevents the rotation cam and the holder from being locked to the fixed guide member unless a large pulling force is applied due to the collision. A vehicle seat characterized by.