JPH06255413A - Seat for vehicle - Google Patents

Abstract

PURPOSE:To keep constant the tensile strength of a cable used to transmit the motive power from a motive power generating means to a lift up means constant constantly, and to operate the lift up operation without a response delay, whereever the seat may be moved. CONSTITUTION:When a seat is moved longitudinally, the motive power transmission from a pulley 13 to the lift up means in a seat cushion 10 is cut off by a motive power circuit cutoff means 18 in the seat cushion 10, according to the operation of a seat slide lever 19. Since the seat is moved in such a condition, the pulley 13 runs idle while winding a cable 12, and moves together with the seat. Consequently, the tensile strength of the cable 12 is maintained constant even when the seat is moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat for preventing a so-called submarine phenomenon in which an occupant sinks into a seat cushion during a vehicle collision.

[0002]

2. Description of the Related Art At the time of a vehicle collision, an occupant tends to move in a vehicle traveling direction due to inertial force. At this time, the occupant is restrained by the seat belt so that the occupant does not move in the traveling direction of the vehicle. On the other hand, depending on how the occupant sits on the seat, the occupant may sink into the seat cushion, a so-called submarine phenomenon. May cause Conventionally, a vehicle seat equipped with a lift-up seat mechanism that prevents the occupant from sinking in the seat cushion by protruding the front part of the seat cushion upward together with a seat belt and an airbag as an occupant protection device against such a phenomenon. Are known.

As a conventional lift-up seat mechanism,
There is known a seat cushion in which a lift-up means and a power generation means are integrally configured. However, when the lift-up means and the power generation means are integrally configured, the response of the lift-up operation is improved, but the weight of the seat itself is increased, which may hinder the forward and backward movement of the seat.
In addition, there is a problem that the lift-up seat mechanism occupies the space inside the seat cushion, so that commercialization is very difficult. Therefore, an example of a vehicle seat equipped with a lift-up seat mechanism that solves this point,
It is disclosed in Japanese Patent Laid-Open No. 58-53525.

According to the vehicle seat provided with the lift-up seat mechanism disclosed in Japanese Patent Laid-Open No. 58-53525, as shown in FIG. 8, an operating member 56 serving as a vehicle collision detection means and a power generation means is provided on the back surface of the front bumper 55 of the vehicle. And a lift-up means including two links 57 and 58 is installed inside the seat cushion 10. Operating member 56
The links 57 and 58 are connected via an inner cable 61. In this mechanism, the power generation means is installed at a position different from the lift-up means (outside the seat cushion, particularly outside the vehicle compartment), and the two are connected by a cable to transmit power, thereby reducing the seat weight and lifting the seat-up mechanism. The seat space inside the seat cushion is reduced.

At the time of a collision, the operating member 56 detects the collision and converts the load of the collision into power for lifting up. The actuating member 56 pulls the inner cable 61 in the outer cable 62, thereby transmitting power to the lift-up means and linearizing the links 57 and 58 as shown by imaginary lines. As a result, the seat cushion front portion 54 is pushed from below, rotates clockwise around the pivot 59 in FIG. 8 and projects upward.

[0006]

However, in the vehicle seat disclosed in Japanese Unexamined Patent Publication No. 58-53525, lift-up means is used when the seat is moved back and forth in order to obtain a sitting posture in which the occupant can easily drive. Moves relative to the power generating means, the tension of the cable varies depending on the moving position of the seat in this mechanism, so that the cable that transmits the power is bent and the play between the inner cable 61 and the outer cable 62 is generated. Variation occurs. As a result, the inner cable 61 pulled by the operating member 56 during the lift-up operation and the outer cable 6 covering the inner cable 61.
Since friction is generated between the two, the magnitude of the power to be transmitted may be different depending on the moving position of the seat, and a response delay may occur in the lift-up operation.

Therefore, according to the present invention, the lift-up operation is performed without delay in response by always keeping the tension of the power transmission member as the power transmission means for transmitting the power to the lift-up means no matter which position the seat moves. The purpose is to let.

[0008]

In order to solve the above problems, a vehicle seat according to claim 1 of the present invention comprises a seat slide mechanism for moving the seat back and forth, and a vehicle collision detection for detecting a vehicle collision. Means, lift-up means installed on the seat cushion for raising the front portion of the seat cushion, and power generation means for generating power for operating the lift-up means when a collision is detected by the vehicle collision detection means. A power transmission means for transmitting the power to the lift-up means, wherein the power transmission means is a first power transmission member supported by the seat and moving integrally with the seat; The means is stretched with a constant tension between the means to supply the power to the first means.
And a second power transmission member for transmitting to the power transmission member of the second power transmission member, the power transmission from the power generation means to the lift-up means is cut off when the seat is operated to move back and forth. It is characterized in that it is provided with a power cutoff means for keeping the tension of the transmission member always constant.

A vehicle seat according to claim 2 of the present invention includes a seat slide mechanism for moving the seat back and forth, a vehicle collision detection means for detecting a vehicle collision, and a front seat cushion provided on the seat cushion. Lift-up means for moving the lift-up portion, power generation means for generating power for operating the lift-up means when a collision is detected by the vehicle collision detection means, and power for transmitting the power to the lift-up means In a vehicle seat including a transmission means, the power transmission means includes a first power transmission member that moves integrally with the seat when the seat moves back and forth, and the power transmission means is stretched with a constant tension between the vehicle body and the power generation means. A second power transmission member for transmitting power to the first power transmission member, wherein the first power transmission member is the second power transmission member. It is possible to move the seat in the longitudinal direction of the seat with respect to the member, and at the same time, engage the member so that power can be transmitted in a direction orthogonal to the direction, so that the tension of the second power transmission member is always kept constant. Characterize.

[0010]

According to the vehicle seat of the first aspect of the present invention, the lift-up means is connected to the power generation means via the power transmission means which is always stretched with a constant tension so that the lift-up operation is not delayed. Has been done. When the vehicle is moved forward or backward when the vehicle is stopped to obtain a sitting posture that is easy for the occupant to drive, the power cut-off means disconnects the power generation means to the lift-up means in conjunction with the forward-backward movement operation of the seat, Power transmission is interrupted. As a result, the lift-up operation is not performed during the movement of the seat. Further, the lift-up means moves relative to the power generation means together with the seat, but the second power transmission member for transmitting power is stretched between the vehicle body and the power generation means and does not move, so that the tension is always constant. Held in.

At the time of a vehicle collision, the power generation means generates power in response to a signal from the collision detection means, and the power is transmitted to the lift-up means via the power transmission means to lift up the front portion of the seat cushion. Done.

Further, according to the vehicle seat of the second aspect of the present invention, the first power transmission member and the second power transmission member are always arranged in the front and rear of the seat regardless of whether the seat is moved back and forth or fixed. It is engaged in a state in which the transmission of power in the moving direction is separated. At the same time, the engagement is in a state in which power can always be transmitted in the direction orthogonal to the front-back movement direction of the seat. Therefore, similarly to the vehicle seat according to claim 1, when the seat is moved back and forth, the second power transmission member does not move even if the first power transmission member moves together with the seat relative to the power generation means. Therefore, the tension is always kept constant.

At the time of a vehicle collision, the power generated by the power generation means is transmitted to the lift-up means via the power transmission means as in the first aspect, and the front portion of the seat cushion is lifted up.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, mainly the driver's seat,
A vehicle seat having a lift-up seat mechanism that operates a lift-up means installed in a passenger seat will be described.

FIG. 1 is a schematic view of an entire vehicle seat having a lift-up seat mechanism according to a first embodiment of the present invention. According to this, the vehicle seat is roughly classified into a collision detection device 21 (not shown) as vehicle collision detection means.
A cylinder 11 as power generation means, a lift-up means (not shown), a cable 12 (second power transmission member) as power transmission means, and a pulley 13 (first).
Power transmission member) and an occlusal release mechanism 18 as a power cut-off means.

The lift-up means (not shown) installed inside the seat cushion 10 causes the front portion of the seat cushion to project upward in the event of a vehicle collision. In this embodiment, known lift-up means is used.

The cylinder 11 is shared by the lift-up means installed for each seat as shown in FIG. 1, and is installed in the floor tunnel 17 as a part of the vehicle body. The cylinder 11 is connected to an inflator 22 as shown in FIG. 2, and a piston 20 is installed inside the cylinder 11. The piston 20 is usually
It is fixed inside the cylinder 11 and can move in the direction of arrow A when the inflator 22 operates during a vehicle collision. The collision detection device 21 is composed of a collision detection sensor and an electronic control device, and is connected to the inflator 22. When the collision detection sensor detects a sudden deceleration of the vehicle which is equal to or more than a predetermined value, the electronic control unit generates a rapid deceleration signal and transmits it to the inflator 22. A gas generating agent is contained in the inflator 22, and when a rapid deceleration signal is received from the collision detection device 21, gas is instantaneously generated, and the gas flows into the connected cylinder 11 and fills it.

Further, the pulley 13 and the guide pulley 1
4a and 14b are installed on the floor tunnel side of each seat cushion 10, and the cable 12 is wound around them. The cable 12 has its one end 12a fixed to a fixing bracket 15, is wound around a pulley 13 via a guide pulley 14a, and passes through a floor tunnel 17 via another guide pulley 14b, and a piston 20 in a cylinder 11 is passed through. And is always stretched with a constant tension. The cable 12 transmits the power generated in the cylinder 11 to the pulley 13, and the pulley 13 transmits to the lift-up means.

The fixed bracket 15 has a structure in which the cable 12 is detached from the fixed bracket 15 when a force higher than a certain tension is applied to the cable 12. In this embodiment, as shown in FIG. 2B, when gas is generated in the cylinder at the time of collision and the piston 20 moves in the direction of arrow A, the cable is pulled in the direction of arrow A, and as a result, one end 1 of the cable 12 is pulled.
2a comes off from the fixing bracket 15.

FIG. 3 is a plan view showing details of the occlusal release mechanism 18 including a partial cross section of the interior of the seat cushion 10 as viewed from above in the vehicle vertical direction. 3 shows a detailed view of the right side of the front seat (driver's side), the arrow FR indicates the front of the vehicle, and R
E indicates the rear of the vehicle. The occlusal release mechanism 18 is installed inside the seat and disconnects the power from the power generation means to the lift-up means when the seat is moved back and forth.
Shaft 26 which is the power input part of the lift-up means
Has a taper shape at one end 26a which is an engaging portion 34 with the pulley 13. The pulley 13 has a pulley center portion 13a, which is an engaging portion 34 with the shaft 26, and has a tapered shape in accordance with the shape of the shaft end portion 26a. Further, since the shaft 26 and the engagement portion 34 of the pulley 13 are formed with serrations, both can rotate integrally during the engagement.

On the other hand, the central portion 26b of the shaft 26 is formed to have a smaller diameter than the one end 26a, and a spring 27 is provided around the central portion 26b. The spring 27 includes a stopper 35 fixed to the seat frame and a spring support portion 26d of the shaft 26.
Supported by the center of the shaft 26
A shaft hole 33 for inserting b is provided. Also,
The pulley 13 is supported from the outside of the seat frame by a pulley supporting cover 28 and a supporting shaft 29, and is pivotally supported by the supporting shaft 29. The spring 27 presses the shaft 26 in the direction of arrow D so that the shaft 26 always meshes with the pulley 13. The other end 26c of the shaft 26 is connected to known lift-up means.

Further, the occlusal releasing mechanism 18, which is a power cut-off means for disengaging the occlusal engagement between the shaft 26 and the pulley 13, has a shaft moving lever 3 interlocked with a seat slide lever 19.
0 and a shaft moving lever 30 provided on the shaft 26
A shaft engaging portion 31 that engages with the spring 27,
It is composed of a stopper 35. When moving the seat,
The shaft moving lever 30 presses the shaft 26 in the direction of arrow C against the pressing of the spring 27 in the direction of arrow D, so that the pulley 13 and the shaft 26 are disengaged.

Next, when the vehicle of the first embodiment of the present invention is stopped,
The operation of moving the seat back and forth to a position desired by the occupant will be described with reference to FIGS. 3 and 4.

The occupant operates the seat slide lever 19 to adjust the position of the seat. At this time, as shown in FIG. 3, the shaft moving lever 30 interlocks with the seat slide lever 19 and rotates counterclockwise about the pivot 32 to engage with the shaft engaging portion 31. When the shaft 26 is pressed by the shaft moving lever 30 against the pressing of the spring 27 in the direction of arrow D, the shaft 26 moves in the direction of arrow C, and the shaft 26 of the engaging portion 34 and the pulley 13 are disengaged from each other. Since the seat is moved back and forth in this state,
The shaft 26 does not rotate and power is not transmitted to the lift-up means. At the same time, the pulley 13 is the cable 1
Since the support shaft 29 idles while rotating 2 and moves together with the seat, even if the seat moves from the position shown by the solid line to the position shown by the phantom line as shown in FIG. 4, the tension of the cable 12 is always constant. Holds constant.

When the seat is moved back and forth, as shown in FIG.
As shown in (a), the shaft moving lever 30 rotates clockwise around the pivot 32 in conjunction with stopping the operation of the seat slide lever 19, and the shaft 26 moves in the direction of arrow D by the pressing of the spring 27. , It engages with the pulley 12 again, and the power can be transmitted anytime.

Next, the operation for performing the lift-up operation at the time of a vehicle collision will be described. At the time of a vehicle collision, when the collision detection device 21, which is a vehicle collision detection means, detects a sudden deceleration of the vehicle which is equal to or more than a predetermined value, the inflator 22 receives a sudden deceleration signal from the collision detection device 21 and a built-in gas for generating power. Ignite and burn the generator. As a result,
As shown in (b), the cylinder 11 is instantly filled with gas, and the volumetric expansion of the gas causes the piston 20 to be pressed in the direction of arrow A. Then, the cable 12 as a power transmission means connected to the piston 20 is instantly pulled in the direction of arrow A. At this time, since the cable 12 is pulled with a certain tension or more, the fixing bracket 15 that has fixed one end 12a of the cable 12 releases the fixing of the cable 12.

When one end 12a of the cable 12 is disengaged from the fixed bracket 15, the pulley 13 has a contact portion 13b between the cable 12 and the pulley 13 shown in FIG. 3, that is, a portion where the cable 12 is wound around the pulley 13. The frictional force causes rotation in the direction of arrow B in FIG. When the pulley 13 rotates, the shaft 26, which is the power input portion of the lift-up means, rotates in the direction of arrow B, like the pulley 13. This rotation is converted into a lift-up operation in which the front portion of the seat cushion 10 is projected upward by the lift-up means.

As described above, the lift-up seat mechanism installed in each seat is powered by the power cut-off mechanism that moves the shaft 26 to disengage the pulley 13 when the seat is moved back and forth. Since the power transmission from the generation means to the lift-up means is cut off, the tension of the cable 12 as the second power transmission member is always kept constant regardless of the position of each seat independently moving, and a predetermined magnitude. Power is transmitted to the lift-up means. Therefore, the lift-up operation is performed uniformly with no response delay.

Next, a second embodiment of a vehicle seat having a lift-up seat mechanism according to the present invention will be described with reference to FIGS. 5 and 6. The same reference numerals are used for the same means and the same members as in the first embodiment, and the description thereof will be omitted.

FIG. 5 shows another structure of the power transmission means and the power cutoff means of the first embodiment. The power transmission means of the second embodiment is a power transmission bar 36 (first power transmission member) which is supported by a seat and serves as a power transmission means and a power cutoff means, and a chain 41 (which is a power transmission means supported by the vehicle body). The second power transmission member) and the guide tunnel 3
It is composed of 8 and.

As shown in FIG. 5, one end of the chain 41 is a piston in the cylinder 11 and the other end is a fixing bracket 39.
It is fixed to and is always stretched with a constant tension. Holes 42 are formed in the chain 41 at regular intervals corresponding to the front-back movement position of the seat. Further, as shown in FIG. 6, the power transmission bar 36 has one end 36a connected to a lift-up means (not shown) installed inside the seat, and the other end 36b.
The pin 4 that fits into the hole 42 formed in the chain 41
Has 0. In addition, a long hole 37 is formed on the side of the seat on the floor tunnel side, and the power transmission bar 36 is inserted so as to be movable rearward along the long hole 37 at the time of collision. The guide tunnel 38 is installed on the side surface of the seat and serves to position the chain 41 so that the pin 40 can be easily fitted into the hole 42 of the chain 41. In addition,
As with the first embodiment, the fixing bracket 39 is unfixed when tension is applied to the chain 41 to a certain level when power is generated.

Next, the operation of the second embodiment will be described with reference to FIGS. When moving the seat back and forth,
As described above, the power transmission bar 36 rotates counterclockwise (in the direction of arrow E) about the pivot 43 in association with the operation of the seat slide lever 19, and the pin 40 is removed from the hole 42 of the chain 41. When the pin 40 is disengaged, the seat cushion 1
0 moves back and forth with the pin 40 of the power transmission bar 36 raised. At this time, since the chain 41 does not move, it is supported by the vehicle body while being stretched with a constant tension. When the occupant moves the seat to a desired position and finishes the operation of the seat slide lever 19, the power transmission bar 36 rotates clockwise around the pivot 43 (in the direction of arrow F), and the pin 40 into the hole 42 of the chain 41. Mating. As a result, power can be transmitted again.

When a vehicle collides, as shown in FIG. 5, when power is generated and the piston 20 in the cylinder 11 moves in the direction of arrow A as in the first embodiment, the chain 41 moves in the direction of arrow A.
Pulled in the direction. Then, one end of the chain comes off from the fixed bracket 39, and the power transmission bar 36 becomes the chain 4
With the movement of 1, it moves in the direction of arrow A along the long hole 37. The movement of the power transmission bar 36 is converted into a lift-up operation by the lift-up means.

Therefore, no matter which position each seat is moved back and forth, the pin 40 is disengaged from the hole 42 formed in the chain 41 and the power transmission is disconnected during the movement, so that the chain 41 as the second power transmission member is separated. The tension is constantly kept constant, and the same effect as in the first embodiment can be obtained.

Next, a vehicle seat provided with the lift-up seat mechanism according to the second aspect will be described as a third embodiment with reference to FIG. The same reference numerals are used for the same means and the same members as in the first embodiment, and the description thereof will be omitted.

The power transmission means in the third embodiment is composed of two guide members 44 fixed to the frame of the seat cushion 10 and a slide rail 49 which is movable along the guide members 44 and is parallel to the longitudinal direction of the seat. A first power transmission member composed of a first slide member 46 formed with a second slide member 46 and a second power transmission member having a convex member 48 movable along a guide member 45 fixed to the vehicle body and fitted to the slide rail 49. Slide member 47 and cylinder 11 at one end
A second power transmission member including a cable 12 connected to the inner piston. Power is generated in the cylinder 11 as in the first embodiment, transmitted from the second power transmission member to the first power transmission member, and finally transmitted to the lift-up means.

One end of the cable 12 is connected to a piston in the cylinder 11, which is the same power generation means as in the first embodiment, and the other end is connected to the second slide member 47 so that the cable 12 is always stretched with a constant tension. Has been done. The second slide member 47 is fixed to the guide member 45 fixed to the seat, like the fixing bracket 15 described in the first embodiment. The fixed portion (not shown) exerts a certain force on the cable 12
When it is added to the second slide member 47 via, the fixing is released.

The second slide member 47 is movable in the vertical direction of the guide member 45 fixed to the vehicle body, and has a convex member 48 fitted to a slide rail 49. Convex member 48
Are movable in the seat back-and-forth direction of the slide rail 49, and are engaged so that power can be transmitted in a direction orthogonal to the slide rail 49 (vertical direction of the seat). The first slide member 46 is movable along the two guide members 44 fixed to the seat, and the first slide member 46 is formed with a slide rail 49 parallel to the longitudinal movement direction of the seat. The first slide member 46
Is connected to a known lift-up means (not shown) so that power can be transmitted. Normally, the first slide member 46 is located at the uppermost point of the guide member 44 (the position shown by the solid line in FIG. 7) and receives power transmission during a vehicle collision,
Move to the lowest point (the position shown by the virtual line in FIG. 7).

Next, the operation of the third embodiment will be described. When moving the seat back and forth, slide rail 4
9 engages with the convex member 48 so as to be movable in the front-back movement direction of the seat, so that the first slide member 46 is engaged.
Moves back and forth together with the seat without moving the second slide member 47. At this time, since the cable 12 connected to the second slide member 47 also does not move, the tension is always kept constant.

When a vehicle collides, power is generated in the cylinder 11 as in the first embodiment, and the cable 12 moves to the arrow H.
When pulled in the direction, the fixation between the second slide member 47 and the guide member 45 fixed to the floor is released, and the second slide member 47 is moved along the guide member 45 by the arrow G.
Move in the direction. At the same time, power is transmitted to the first slide member 46 via the slide rail 49 engaged with the convex member 48 that is integral with the second slide member 47. As a result, the first slide member 46 moves to the lowest point (the position shown by the phantom line in FIG. 7) of the sheet-fixed guide member 44. Then, the movement of the first slide member to the lowest point is converted into the lift-up operation by the lift-up means.

Therefore, in the third embodiment, the power transmission from the power generation means to the lift-up means is always separated in the longitudinal direction of the seat, and at the same time, the power is always transmitted in the orthogonal direction. Is in a state of being engaged so that can be transmitted. As a result, the tension of the cable 12 as the second power transmission member is always kept constant no matter which position each seat is moved back and forth, and the same effect as in the first embodiment can be obtained.

In the above-described first to third embodiments, the mechanism of the lift-up means installed inside the seat cushion and the installation place are not particularly limited. Conventional mechanisms may be utilized. Further, although the respective seats share the cylinder which is the power generating means and the power generating means is provided in the floor tunnel of the vehicle body, the present invention is not limited to this.
It can be used with one sheet or multiple sheets. As the power generating means, one that receives a collision detection signal and instantly generates power is used. For example, an elastic body such as a spring, an explosive that explodes in a cylinder, one that uses the attractive force of an electromagnet, and one that uses a motor are conceivable. It should be noted that the power generation means may be installed in an engine room, a trunk room, or the like, but basically, it may be installed outside the vehicle compartment to obtain a certain amount of space.

Further, as the power transmission means, a transmission mechanism by a sprocket and a chain or a mechanism such as a pinion and a gear may be used in addition to the above-mentioned embodiment. Further, in the first embodiment as the method of the power cutoff means, the shaft is moved in conjunction with the seat slide lever at the time of moving the seat to disconnect the power transmission, but the pulley may be moved. The mechanism does not matter as long as the transmission to the power is cut off in response to the operation. Further, in the third embodiment, the guide member, the slide member and the like are placed vertically inside the seat cushion, but they may be placed horizontally. The vehicle seat equipped with the lift-up seat mechanism of the present invention can be applied to a power seat, and a seat belt preloader or the like may be included as a target for transmitting power with a cable at the time of collision.

[0044]

According to the vehicle seat of the present invention, the tension of the power transmission means for transmitting the power from the power generation means to the lift-up means is always constant regardless of the position of the seat. It is possible to prevent a delay or variation in the response of power transmission caused by bending or play of the transmission means.

[Brief description of drawings]

FIG. 1 is a schematic view showing an entire vehicle seat including a lift-up seat mechanism according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of a state during (a) lift-up non-operation and (b) lift-up operation in the first embodiment of the present invention.

FIG. 3 is a plan view including a partial cross section of the occlusal release mechanism when the seat is fixed and when the seat is moved back and forth according to the first embodiment of the present invention when the inside of the seat cushion is viewed from above in the vehicle vertical direction. .

FIG. 4 is a schematic side view of the relationship between the pulley and the cable when the seat moves back and forth according to the first embodiment of the present invention.

FIG. 5 is a schematic view showing an entire vehicle seat provided with a lift-up seat mechanism according to a second embodiment of the present invention.

FIG. 6 is a front view including a partial cross section of a power cutoff unit when the seat is moved forward and backward according to a second embodiment of the present invention, as seen from the front of the vehicle.

FIG. 7 is a schematic view showing an entire vehicle seat provided with a lift-up seat mechanism according to a third embodiment of the present invention.

FIG. 8 is a schematic view showing an entire vehicle seat provided with a lift-up seat mechanism in a conventional example.

[Explanation of symbols]

10 ... Seat cushion 11 ... Cylinder (power generation means) 12 ... Cable (power transmission means) 13 ... Pulley (power transmission means) 14 ... Guide pulley 18 ... Occlusion release mechanism ( Power shut-off means 19 ・ ・ ・ Seat slide lever 20 ・ ・ ・ Piston 21 ・ ・ ・ Collision detection device (vehicle collision detection means) 26 ・ ・ ・ Shaft 27 ・ ・ ・ Spring 28 ・ ・ ・ Support cover 29 ・ ・ ・Support shaft 30 ・ ・ ・ Shaft moving lever 36 ・ ・ ・ Power transmission bar (power transmission means) 37 ・ ・ ・ Long hole 40 ・ ・ ・ Pin 41 ・ ・ ・ Chain (power transmission means) 44 ・ ・ ・ Guide member ( Seat fixing) 45 ... Guide member (floor fixing) 46 ... First slide member (first power transmission member) 47 ... 2 of the slide member (second power transmission member) 48 ... projecting member 49 ... slide rail

Claims (2)

[Claims] 1. A vehicle collision detection means for detecting a vehicle collision, a seat slide mechanism for moving a seat back and forth, a lift-up means installed on a seat cushion for raising a seat cushion front portion, and the vehicle collision detection. A vehicle seat comprising a power generation means for generating power for operating the lift-up means when a collision is detected by the means, and a power transmission means for transmitting the power to the lift-up means. The transmission means is a first power transmission member that is supported by the seat and moves integrally with the seat, and a second power transmission member that is stretched with a constant tension between the vehicle body and the power generation means and that transmits the power to the first power transmission member. It is composed of a power transmission member and disconnects power transmission from the power generation means to the lift-up means when the seat is operated to move back and forth. A vehicle seat comprising a power cut-off means for keeping the tension of the second power transmission member always constant. 2. A vehicle slide detecting mechanism for moving a seat back and forth to detect a vehicle collision, lift-up means installed on a seat cushion for raising a front portion of the seat cushion, and the vehicle collision detection. A vehicle seat comprising a power generation means for generating power for operating the lift-up means when a collision is detected by the means, and a power transmission means for transmitting the power to the lift-up means. The transmission means is a first power transmission member that moves integrally with the seat when the seat moves back and forth, and a first power transmission member that is stretched between the vehicle body and the power generation means with a constant tension to transmit the power to the first power transmission member. And a second power transmission member, wherein the first power transmission member is movable in the front-back movement direction of the seat with respect to the second power transmission member. At the same time, the vehicle seat is engaged so that power can be transmitted in a direction orthogonal to the direction, and the tension of the second power transmission member is always kept constant.