JP2891289B2 - 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, and more specifically, to a base frame supported on a footrest and a base frame mounted on the base frame. A seat cushion supported while maintaining a substantially horizontal posture state, and a seat back erected on the 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. The present invention relates to a vehicle seat provided.

[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-back 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 conventionally known vehicle seat lifter mechanism simply swings the seat cushion in accordance with the physique and preference of the occupant 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 capable of adjusting a forward / backward movement of a seat cushion 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 fixedly attached to the seat back, a support bracket having a long hole extending in the front-rear direction is provided at a lower rear end side of the seat cushion, and one end of a first link is pivotally supported at a 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 and the other end of the second link are pivotably supported. It is characterized in that a fluid actuator capable of engaging and disengaging the locking position of the expansion / contraction position and releasing it is interposed between the lower end on the rear end side of the seat cushion and the front end of the base frame. I do.

A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, 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. And

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.

[0012]

According to the vehicle seat according to the first aspect of the present invention, the first link and the second link are rotatably supported on the shaft, and the shaft supports are engaged with the elongated holes of the support bracket of the seat cushion. Since a front / rear position adjustment mechanism capable of regulating the length between the lower end of the rear end side of the seat cushion and the front end of the base frame is inserted between the lower end and the front end of the base frame, when the seat back is tilted rearward, The lower end of the arm bracket pivots forward, and the pivots of the first link and the second link can be moved forward along the elongated hole of the bracket of the seat cushion. The rear end of the seat cushion can be moved up and down, 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 fluid actuator. Door can be.

According to the vehicle seat according to 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 according to 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.

[0015]

1 to 5 show one embodiment of a vehicle seat according to the present invention. In this embodiment, a vehicle seat 10 is composed of two or three bench-type seats.
A description will be given of a case where the present invention is applied to a rotary seat having a plurality of 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 a vehicle floor 15 or the like, and a seat cushion 13 is mounted on the base frame 12.
Is supported. 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.

Between the base frame 12 below the seat cushion 13 and the floor 15 of the passenger compartment, the vehicle seat 1 is provided.
A rotation mechanism 18 is provided for supporting the rotation of the rotation of the rotating shaft 0 freely.
The entire vehicle seat 10 is configured so that its rotation can be adjusted in the horizontal direction about the rotation mechanism 18 and its 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.

A 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.

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 pair of left and right brackets 42 having elongated holes 44 extending in the front-rear direction are provided at a lower portion on the rear end side of the cushion frame 31 of the seat cushion 13. 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 slider 40 has an arc-shaped guide plate portion 40a.
And left and right side plate portions 40b and 40c 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 bracket 4 provided at the lower center of the rear end side frame of the cushion frame 31 is provided.
7 is connected to one end 48a of a hydraulic actuator 48 such as a hydraulic cylinder capable of releasing a locked state for adjusting the position of the seat cushion 13 in the front-rear direction and a releasing state thereof, and the other end 48b is connected to the front frame portion of the base frame 12. Connected to a bracket 49 fixed to the bracket.

In the hydraulic actuator 48, a wire cable 50 containing an inner cable for unlocking the lock is connected to an unlock button 51 formed on the upper side surface of the armrest 17, and the unlock button 51 is pressed. As a result, the fluid type actuator 4
The locked state of 8 is released, and the state returns to the locked state by releasing the pressing.

A tension spring 52 is provided between the seat cushion 13 and the rear end of the base plate 12.
Is applied, and the mounting portion of the tension spring 52 has play. Therefore, the urging force of the tension spring 52 is not acting, and when the seat back 14 becomes a predetermined inclination angle or more, the tension is It is provided so that the urging force of the spring 52 acts. Seat back 14
Is configured to maintain a neutral state substantially upright by a link mechanism including the first and second links 35 and 37 and the like.

According to such a configuration, as shown in FIG. 4A, the seat back 14 is in a neutral state in which the seat back 14 is substantially erected, and when the occupant is seated in this state, the seat cushion 13 Since the expression actuator 48 is in the locked state, 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 51 formed on the armrest 17 is pressed in the seated state, and the seat cushion 13 is pushed through the wire cable 50. The locked state of the hydraulic actuator 48 is released.

As shown in FIG. 4B, 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 pivoted. The fluid actuator 48 can be moved back and forth until it comes into contact with the support pin 39, and the hydraulic actuator 48 is locked by releasing the pressing of the lock release button 51 at a desired front and rear position, and the front and rear positions of the seat cushion 13 are set. Is fixed.

When the seat back 14 is tilted rearward from the neutral state shown in FIGS. 4 (a) and 4 (b), the unlock button 27 formed on the armrest 17 is pressed in a seated state and the actuator is pressed. 25, the seat back 14 is pushed rearward from the back after the locked state of the seat back 25 is released.
As shown in FIG. 6B, the pivot 20a is tilted rearward against the tension spring 52 with the pivot 20a as a fulcrum.

At this time, the lower end of the arm bracket 32 rotates clockwise due to the backward tilting of the seat back 14, 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.

5A and 5B, the locked state of the actuator 25 is released by pressing the lock release button 27 from the tilted state of the seat back 14.
As shown in FIG. 3, the seat back 14 is returned to the front neutral state by the tension spring 52, and at the same time, the rear end of the seat cushion 13 is raised.

It should be noted that the present invention is not limited to the structure of the embodiment described above.
It is free to change, and various modifications of each part of the vehicle seat 10 can be considered. For example, in the above-described embodiment, the tilting operation of the seat back 14 is performed by the actuator 25, but the present invention is not limited to this, and 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 48 for moving the seat cushion 13 back and forth is released by the lock release buttons 27 and 51, respectively. Not limited to this, any release mechanism such as a rotating lever can be applied.

[0035]

As described above, according to the first aspect of the present invention,
According to the vehicle seat according to the first aspect, the first link and the second link are pivotally supported so as to be rotatable, the shaft supports are engaged with the elongated holes of the support bracket of the seat cushion, and the lower portion of the rear end side of the seat cushion is Since a front-rear position adjustment mechanism capable of regulating the length between them is interposed between the front end of the base frame and the front end of the base frame, the lower end of the arm bracket rotates forward when the seat back is tilted backward. The first link and the second link can be moved forward along the long hole of the bracket of the seat cushion, and the rear end of the seat cushion can be moved up and down by the rotation of the second link. 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 fluid actuator.

According to the vehicle seat according to 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, since the unlocked state of the fluid actuator can be released by the unlocking portion provided on the armrest, the front / rear position adjustment of the seat cushion is facilitated. 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 and backward tilting 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 showing one embodiment of a reclining state of a vehicle seat according to the present invention.

FIG. 2 is a side view showing one embodiment of a normal seating state of the vehicle seat according to the present invention.

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

FIGS. 4A and 4B show a vehicle seat according to the present invention in a normal seating state, in which FIG. 4A is a side view of a seat cushion in a rear most state, and FIG. .

5A and 5B show a reclining state of a seat back of a vehicle seat according to the present invention, wherein FIG. 5A is a side view of a seat cushion in a rear most state, and FIG. 5B is a side view of a seat cushion in a front most state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Base frame 13 Seat cushion 14 Seat back 15 Car cabin floor 16 Bracket 17 Armrest 18 Rotation mechanism 20 Reclining mechanism 20a Support shaft 21 Back frame 23 Hinge bracket 25 Actuator 31 Cushion frame 32 Arm bracket 35 First link 37 2nd link 39 pivot pin 40L slider 40R slider 42 support bracket 44 long hole 47 bracket 48 fluid actuator 49 bracket 50 wire cable 51 unlock button 52 tension spring

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, 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 an elongated hole extending in the front-rear direction is provided at a lower portion on a rear end side of the seat cushion; one end of a first link is pivotally supported at a lower end side of the arm bracket; And the other end of the first link and the other end of the second link are rotatably supported, and the shaft support is engaged with the elongated hole of the support bracket, and the rear end of the seat cushion is A vehicle seat characterized in that a fluid actuator capable of locking and retracting a telescopic position and releasing the telescopic position is interposed between a lower side portion and a front end of the base frame. 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.