JP3137175B2 - Vehicle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat suitable for use as a vehicle seat in, for example, a railway vehicle.
More specifically, a base frame supported on a footrest, a seat cushion supported on the base frame while maintaining a substantially horizontal posture, and a standing rear end of the seat cushion on the base frame. And a seat back supported by a support shaft so as to be tiltable in the front-rear direction of the seat.

[0002]

2. Description of the Related Art In general, a vehicle seat comprises a seat cushion and a seat back provided upright behind the seat cushion.
In addition, the seat back can be tilted and adjusted in the front-rear direction by a reclining mechanism, or the seat frame that supports the entire seat is supported on the floor surface of the vehicle body by a front-rear slide device, etc., and the vehicle body is moved in the front-rear direction. By doing so, it is possible to cope with the physique and preference of the occupant and to obtain an appropriate sitting state for the occupant.

Further, in recent years, a seat cushion portion of a seat is supported via a lifter mechanism such as a parallel link mechanism and the like, and is vertically moved in parallel, or a front end of a slide rail is curved upward. Various vehicle seats have also been proposed in which the seat cushion described above can be more appropriately adjusted by swinging the seat cushion accordingly.

That is, in such a vehicle seat, the front end of the seat cushion is moved obliquely upward in front of the seat, and the rear end of the seat cushion is downwardly moved downward. When the swinging motion is performed, it is possible to prevent the seat part of the seated person from shifting forward, and to exert an effect in obtaining a stable seated state. In particular, such a swing operation of the seat cushion is adopted when the seating position of the seated person is likely to shift and the seating posture becomes unstable, such as when the seat back is tilted to the seat back side. It is effective.

[0005]

However, the known vehicle seat lifter mechanism merely swings the seat cushion in accordance with the physique and preference of the seated person regardless of the seat back. Many things,
When the seat back is tilted, the occupant operates the lifter mechanism in accordance with the change in the sitting posture and swings the seat back to a predetermined posture state. The structure involved was complicated, which was a problem in practical use.

As a vehicle seat, a rotary seat for a railway vehicle is known, for example, in which the orientation of the seat can be changed and adjusted in accordance with the preference and demand of a seated person. The above-described seat cushion swing mechanism cannot be easily applied to a rotary seat.

That is, as this kind of rotary type vehicle seat, a rotation adjusting mechanism such as a face-to-face type or a shaft-up rotary type is provided below the seat body and interposed between the seat body and the floor of the passenger compartment. Therefore, the lifter mechanism as described above cannot be applied as it is.

The present invention has been made in view of such circumstances, and is interlocked with the tilting operation of the seat back to the back side,
Adopts a simple swing mechanism that can swing the seat cushion, prevents the hips from slipping, expands the hip angle, and has excellent support from the pelvis to the thoracic vertebra in the operating angle range of the back and forth tilt of the seat back It is another object of the present invention to provide a vehicle seat in which a seat cushion can be easily moved back and forth separately from a reclining mechanism.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a vehicle seat according to a first aspect of the present invention includes a base frame supported on a footrest, and a base frame. A vehicle seat comprising: a seat cushion supported on a frame; and a seat back erected on a rear end side of the seat cushion on the base frame and supported by a support shaft so as to be tiltable in the front-rear direction of the seat. An arm bracket is fixed to the seat back frame, a support bracket having a long hole extending in the front-rear direction is provided at a lower portion on a rear end side of the seat cushion frame, and one end of a first link is pivotally supported at a lower end side of the arm bracket. Then, one end of a second link is pivotally supported on the base frame side, and the other end of the first link and the other end of the second link can be rotated by a pivot pin. Journalled, engaged with 該枢 supporting pin to the elongated hole of the support bracket, and pivotally supported to the front side in the rotating arm near the lower end center of rotation of said base frame,
An elongated hole is formed at an upper end of the pivot arm, and a bracket is provided on a laterally extending support frame bridged at a substantially intermediate position in the front-rear direction of the seat cushion frame, and the bracket has an upper end at the upper end of the pivot arm. And a fluid actuator capable of locking and retracting the telescopic position and releasing the same is inserted between the lower end of the rotating arm and the rear end of the base frame. The front and rear positions of the seat cushion can be adjusted independently of the tilting of the seat back by the operation of (1).

According to the vehicle seat of the first aspect, the first link and the second link are rotatably supported by the shaft, and the shaft support is engaged with the elongated hole of the support bracket of the seat cushion. A pivot arm having an upper end engaged with a seat cushion is pivotally supported on the base frame, and a length between the lower end of the pivot arm and a rear end of the base frame is adjusted by a fluid actuator. Therefore, when the seat back is tilted backward, the lower end of the arm bracket rotates forward, and the pivot pin, which is the pivot of the first link and the second link, moves along the long hole of the bracket of the seat cushion. To move the rear end of the seat cushion up and down by the rotation of the second link, and to release the locked state of the fluid actuator. The longitudinal position of the seat cushion independently of the seat back can be arbitrarily adjusted, this time can be reduced the amount of movement of the hydraulic actuator with respect to the longitudinal movement of the seat cushion by.

According to a second aspect of the present invention, in the vehicle seat according to the first aspect, a sliding guide portion for guiding a lower portion of the seat cushion in a front-rear direction is formed on an upper surface of a front end of the base frame. And

According to the second aspect of the present invention, the sliding guide for guiding the lower portion of the seat cushion in the front-rear direction is formed on the upper surface of the front end of the base frame. The front-back movement of the seat cushion can be performed smoothly.

According to a third aspect of the present invention, in the vehicle seat according to the first or second aspect, the unlocked state of the hydraulic actuator is released by an unlocking portion provided on an armrest. I do.

According to the vehicle seat of the third aspect, the unlocked state of the hydraulic actuator can be released by the unlocking portion provided on the armrest.
The front / rear position adjustment of the seat cushion can be easily performed.

[0015]

FIG. 1 to FIG. 5 show an embodiment of a vehicle seat according to the present invention. In this embodiment, a vehicle seat 10 has two seats such as a bench seat. Alternatively, a case will be described in which the present invention is applied to a rotary seat having three seating portions arranged in series, but the present invention is not limited to such a seat structure.

The vehicle seat 10 includes a base frame 12 supported by a footrest 11 mounted on the floor of a vehicle cabin or the like. A seat cushion 13 is supported on the base frame 12. A bracket 16 extending in the front-rear direction is formed at a central portion of the base frame 12, and a rear portion of the bracket 16 is formed so as to be curved upward so as to protrude toward a lower end direction of the seat back 14. A U-shaped armrest 17 is fixed.

A rotation mechanism 18 is provided between the base frame 12 and the footrest 11 below the seat cushion 13 to support the vehicle seat 10 so that the vehicle seat 10 can be adjusted in rotation. The rotation is adjustable in the horizontal direction around the center 18 so that the direction can be changed to any direction.

The back frame 2 of the seat back 14
A hinge bracket 23 is formed at the lower part of the side of
A support shaft 20a on the seatback 14 side, which is a rotation center of the reclining mechanism 20, is fixed to the hinge bracket 23. The support shaft 20a on the seat back 14 side includes the bracket 16 of the base frame 12 and the armrest 1
7 at the rear end.

The hinge bracket 23 of the back frame 21 extends downward. One end 25a of an actuator 25 such as a fluid pressure cylinder for tilting the seat back 14 in the front-rear direction at the lower end 23a of the hinge bracket 23. And the other end 25b is connected to the base frame 12 side.

In the actuator 25, a wire cable 26 containing an inner cable for releasing the lock is connected to a lock release button 27 formed on the upper side surface of the armrest 17, and the lock release button 27 is provided.
By pressing, the locked state of the actuator 25 is released, and by releasing the pressure, the actuator 25 returns to the locked state. Reference numeral 28 denotes a stopper which engages with the hinge bracket 23 of the back frame 21 to hold the seat back 14 in an upright state.

A pair of left and right arm brackets 32 is fixed to the support shaft 20a of the back frame 21. One ends of first links 35 are respectively supported at lower ends of the pair of left and right arm brackets 32, and are connected to the base frame 12 side. Second
One end of each link 37 is pivotally supported, and the first link 35
, And the other end of the second link 37 are rotatably supported.

A bracket 41 having a long hole 41a extending in the front-rear direction and extending through the base frame 12 is provided at a lower portion on the front end side of the seat cushion frame 31 of the seat cushion 13, and is provided at a lower portion on the rear end side in the front-rear direction. A pair of left and right support brackets 42 having elongated holes 44 are provided. A pivot pin 39 as a shaft support of the first link 35 and the second link 37 is slidably engaged with the elongated hole 44 of the bracket 42, respectively.

The front end sides of the left and right frame portions of the seat cushion frame 31 are slidably guided in the front-rear direction by a pair of left and right sliders 40L and 40R as sliding guide portions fixed to the upper surface of the front end portion of the base frame 12, respectively. Have been. The sliders 40L, 40R include an arc-shaped guide plate portion 40a and left and right side plate portions 40b erected on both sides thereof.
The left and right side plate portions 40b and 40c regulate the movement of the base frame 12 in the left and right direction.

As shown in FIG. 3, a pivot arm 48 is mounted on a bracket 47 provided at the center rear portion of the front end frame of the base frame 12 at a pivot center point near the lower end thereof.
8a. A long hole 48b is formed at the upper end portion of the rotating arm 48 on the long side.
A pin 51 inserted into a bracket 50 provided on a laterally extending support frame 49 bridged at a substantially intermediate position in the front-rear direction of the seat cushion frame 31 is engaged therein.

A locked state for adjusting the position of the seat cushion 13 in the front-rear direction between the lower end of the short side of the rotating arm 48 and a bracket 52 formed at the center of the rear end frame of the base frame 12, and its release. A fluid-type actuator 53 such as a fluid-pressure cylinder is inserted.

In the hydraulic actuator 53, a wire cable 54 containing an inner cable for unlocking the lock is connected to an unlock button 55 formed on the upper side surface of the armrest 17, and the unlock button 55 is pressed. As a result, the fluid type actuator 5
The lock state of 3 is released, and the lock state is restored by releasing the pressing.

A tension spring 57 is stretched between the pivot pin 39 of the first link 35 and the second link 37 and the rear end of the base plate 12. The urging force of the tension spring 57 causes the seat to be seated. Back 14
Is configured so as to maintain a neutral state substantially standing upright by a link mechanism including the first link 35 and the second link 37.

According to such a configuration, as shown in FIG. 1, the seat back 14 is in a neutral state in which the seat back 14 is substantially erected, and when the occupant sits in this state, the seat cushion 13 is Is locked, so that its front and rear positions are fixed.

In this state, in order to adjust the front / rear position of the seat cushion 13 according to the occupant's preference, the lock release button 55 formed on the armrest 17 is pressed in the seated state, so that the seat cushion 13 can be adjusted via the wire cable 54. The locked state of the fluid actuator 53 is released.

As shown in FIG. 2, the cushion frame 31 is guided by the sliders 40L and 40R when the occupant moves his / her waist in a seated state, and both ends of the elongated hole 44 of the support bracket 42 are pivotally supported by the pivot pins 39. The hydraulic actuator 53 is locked by releasing the lock release button 55 at the desired front-rear position, and the front-rear position of the seat cushion 13 is fixed. You.

At this time, the seat cushion frame 31
The fluid actuator 53 is connected to the fluid actuator 53 via a pivot arm 48. The distance from the pivot center of the pivot arm 48 to the pin 50 inserted into the bracket 49 of the seat cushion frame 31 is the fluid from the pivot center. Since the length is set to be longer than the distance to the mounting point of the actuator 53, the amount of expansion and contraction of the fluid actuator 53 can be reduced with respect to the amount of movement of the seat cushion frame 31 in the front-rear direction. Can be

Also, the seat back 1 shown in FIGS.
In the case of tilting the seat back 14 from the neutral state of FIG. 4 to the rear side, the lock release button 27 formed on the armrest 17 is pressed in the seated state to release the locked state of the actuator 25, and then the seat back 14 is pushed rearward on the back. As a result, the seat back 14 tilts rearward against the tension spring 57 about the pivot 20a as a fulcrum, as shown in FIGS.

At this time, the lower end of the arm bracket 32 rotates clockwise due to the tilting of the seat back 14 rearward, and the first link 35 and the second link 37 move the rear end of the seat cushion 13 downward. Move to
Even in this state, the first link 35 and the second link 37
Can be slid in the front-rear direction along the elongated hole 44 of the bracket 42.

The unlocking button 27 is pressed from the tilted state of the seat back 14 shown in FIGS. 4 and 5 to release the locked state of the actuator 25, and as shown in FIG.
Is returned to the neutral state in which the front hinge bracket 23 is engaged with the stopper 28, and at the same time, the rear end of the seat cushion 13 is raised.

The present invention is not limited to the structure of the above-described embodiment, and the shape, structure, etc. of each part can be freely changed and changed as needed. Various modifications may be considered. For example, in the above-described embodiment, the tilting operation of the seat back 14 is performed by the actuator 25, but is not limited thereto.
Various means may be employed as long as the seat back 14 can be tilted.

The lock state of the actuator 25 for tilting the seat back 14 and the hydraulic actuator 53 for moving the seat cushion 13 back and forth is released by the lock release buttons 27 and 55, respectively. Not limited to this, any release mechanism such as a rotating lever can be applied.

[0037]

As described above, according to the first aspect of the present invention,
According to the vehicle seat of the present invention, the base frame supported on the footrest, the seat cushion supported on the base frame, and the seat cushion is erected on the base frame at the rear end side of the seat cushion, An arm bracket fixed to the seat back frame, and a long hole extending in the front-rear direction below a rear end side of the seat cushion frame. A support bracket having an arm bracket, one end of a first link is pivotally supported on the lower end side of the arm bracket, one end of a second link is pivotally supported on the base frame side, and the other end of the first link, The other end of the link is rotatably supported by a pivot pin, the pivot pin is engaged with an elongated hole of the support bracket, and the other end of the link is provided in front of the base frame. The pivot center of the pivot arm is pivotally supported on the side, and a long hole is formed at the upper end of the pivot arm, and extends in the lateral direction bridged at a substantially intermediate position in the front-rear direction of the seat cushion frame. A bracket is provided on the support frame, and a long hole of the upper end of the rotating arm is locked to the bracket by a pin, and a locked state of a telescopic position is provided between a lower end of the rotating arm and a rear end of the base frame. The seat back is tilted rearward because the seat cushion can be adjusted back and forth independently of the tilt of the seat back by the operation of the hydraulic actuator. In this case, the lower end of the arm bracket rotates forward,
The pivot portion of the link and the second link can be moved forward along the long hole of the bracket of the seat cushion,
The rear end of the seat cushion can be moved up and down by rotating the second link, and the front and rear positions of the seat cushion can be arbitrarily adjusted independently of the seat back by releasing the locked state of the hydraulic actuator. At this time, the amount of expansion and contraction of the fluid actuator can be reduced with respect to the amount of forward and backward movement of the seat cushion.

According to the vehicle seat of the second aspect of the present invention, the sliding guide portion for guiding the lower portion of the seat cushion in the front-rear direction is formed on the upper surface of the front end of the base frame. The front-back movement of the seat cushion can be performed smoothly.

According to the vehicle seat of the third aspect of the present invention, the unlocked state of the hydraulic actuator can be released by the unlocking portion provided on the armrest, so that the front / rear position adjustment of the seat cushion can be easily performed. Can be done.

Further, according to the present invention, a simple swing mechanism capable of swinging the seat cushion in conjunction with the tilting operation of the seat back to the rear side is employed, and the operating angle of the forward / backward tilt of the seat back is adopted. In this range, it is possible to obtain a vehicle seat that prevents hip slip, enlarges a hip angle, has an excellent support state from the pelvis to the thoracic vertebra, and can adjust the seat cushion back and forth separately from the reclining mechanism.

[Brief description of the drawings]

FIG. 1 is a side view of a vehicle seat according to the present invention in which a seat back is in a normal sitting state and a seat cushion is in a rearmost state.

FIG. 2 is a side view of the vehicle seat according to the present invention in a state where a seat back is in a normal sitting state and a seat cushion is in a front most-rest state.

FIG. 3 is a schematic exploded perspective view showing a seat frame structure of a vehicle seat according to the present invention.

FIG. 4 is a side view of the vehicle seat according to the present invention in a state where a seat back is in a reclining state and a seat cushion is in a rearmost state.

FIG. 5 is a side view of the vehicle seat according to the present invention in a state where a seat back is in a reclining state and a seat cushion is in a front most-rest state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Base frame 13 Seat cushion 14 Seat back 16 Bracket 17 Armrest 18 Rotation mechanism 20 Reclining mechanism 20a Support shaft 21 Back frame 23 Hinge bracket 25 Actuator 31 Seat cushion frame 32 Arm bracket 35 First link 37 Second link 39 Pivot pin 40L Slider 40R Slider 42 Support bracket 44 Elongated hole 47 Bracket 48 Rotating arm 53 Fluid actuator 54 Wire cable 55 Unlock button 57 Tension spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47C 1/023 B60N 2/02 B60N 2/22

Claims (3)

(57) [Claims] A base frame supported on a footrest;
A seat cushion supported on the base frame,
An arm bracket fixed to the seat back frame, wherein the vehicle seat includes a seat back that is erected on a rear end side of the seat cushion on the base frame and is supported by a support shaft so as to be tiltable in the front-rear direction of the seat. A support bracket having a long hole extending in the front-rear direction is provided at a lower portion on a rear end side of the seat cushion frame, one end of a first link is pivotally supported on a lower end side of the arm bracket, and a second link is provided on the base frame side. Is pivotally supported, and the other end of the first link and the other end of the second link are pivotally supported by a pivot pin. The pivot pin is engaged with an elongated hole of the support bracket. And, a pivot center near the lower end of the pivot arm is pivotally supported on the front side of the base frame,
An elongated hole is formed at an upper end of the pivot arm, and a bracket is provided on a laterally extending support frame bridged at a substantially intermediate position in the front-rear direction of the seat cushion frame, and the bracket has an upper end at the upper end of the pivot arm. And a fluid actuator capable of locking and retracting the telescopic position and releasing the same is inserted between the lower end of the rotating arm and the rear end of the base frame. The vehicle seat can be adjusted in the front-rear position independently of the tilting of the seat back by the operation of (1). 2. The vehicle seat according to claim 1, wherein a sliding guide portion for guiding a lower portion of the seat cushion in a front-rear direction is formed on an upper surface of a front end of the base frame. 3. The vehicle seat according to claim 1, wherein the unlocked state of the hydraulic actuator is released by an unlocking portion provided on an armrest.