JP3013882B2 - 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 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 provides 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 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. One end of a horizontal pivot arm that pivots in a horizontal plane at the rear side of the base frame is engaged with the long hole of the base, and the other end of the pivot arm is engaged with the seat cushion. In addition, a fluid actuator capable of locking and unlocking in an expanded and contracted state is inserted between the vicinity of the pivotal support position and the front end of the base frame.

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. One end of the horizontal rotation arm is pivotally supported on the rear end side of the base frame, and the other end is engaged with a seat cushion. The length between the lower end of the horizontal rotation arm and the front end of the base frame Is adjusted by a fluid actuator, so that when the seat back is tilted backward, the lower end of the arm bracket rotates forward, and the shaft supports of the first link and the second link are inserted into the elongated holes of the bracket of the seat cushion. Along with the rear end of the seat cushion by the rotation of the second link, and the fluid actuator can be unlocked. By this, the front and rear positions of the seat cushion can be arbitrarily adjusted independently of the seat back. At this time, since the mounting position of the fluid actuator is near the pivotal support position of the horizontal rotation arm, the seat lever is The cushion can be moved back and forth with a small force, and the amount of movement of the hydraulic actuator can be reduced with respect to the amount of movement of the seat cushion in the back and forth.

According to a second aspect of the present invention, there is provided the vehicle seat according to the first aspect, wherein the horizontal pivot arm has an inclined plate portion between a pivotal support position on the base frame and an engagement position on the seat cushion. It is characterized in that a fluid actuator is mounted at a position close to the pivotal support position of the inclined plate portion.

According to the vehicle seat of the second aspect, the fluid actuator can be directly mounted on the inclined plate portion of the horizontal rotation arm without providing a separate mounting bracket, and the mounting structure is simplified. be able to.

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 the embodiment of the present invention, a vehicle seat 10 is, for example, a bench type seat. A description will be given of a case where the present invention is applied to a rotary seat having two or 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.

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 long holes 44 extending in the front-rear direction are provided at a lower portion on the rear end side of the seat cushion frame 31 of the seat cushion 13. A pivot pin 39 serving as a shaft support portion of the first link 35 and the second link 37 is provided with an elongated hole 44 of the bracket 42.
Are slidably engaged with each other.

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 to FIG.
The horizontal pivot arm 48 is attached to a horizontal bracket 47 provided outside the center second link 37 in the rear end side frame 2.
Is pivotally supported by a pin 48a at the position of the rotation center point on one end side.

The horizontal rotating arm 48 includes a horizontal plate portion 48b pivotally supported by the horizontal bracket 47, an inclined plate portion 48c extending obliquely upward from the left end side, and the inclined plate portion 4c.
8c and a horizontal plate portion 48d extending in the horizontal direction from the upper end. A long hole 48e extending in the left-right direction is formed in the horizontal plate portion 48d of the horizontal rotation arm 48,
A pin 51 protruding downward from the rear end frame of the seat cushion frame 31 is engaged in the elongated hole 48e.

The position of the seat cushion 13 in the front-rear direction is adjusted between the position of the inclined plate portion 48c of the horizontal rotating arm 48 close to the horizontal plate portion 48b and the bracket 52 formed on the front end frame of the base frame 12. A hydraulic actuator 53 such as a hydraulic cylinder capable of releasing the lock state and the lock state is interposed.

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 locked state of 3 is released, the expansion / contraction state is adjusted, and the state is returned to the locked state 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, and 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, it is assumed that 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 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, a lock release button 55 formed on the armrest 17 is pressed in a seated state, and the seat cushion 13 is pushed through the wire cable 54. The locked state of the fluid actuator 53 is released.

As shown in FIG. 2, the seat 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. It can be moved back and forth until it comes into contact with 39, and by releasing the press of the lock release button 55 in a desired telescopic state, the fluid actuator 53 is locked and the front and rear position of the seat cushion 13 is fixed. Is done.

At this time, the seat cushion frame 31
And a hydraulic actuator 53 are connected via a horizontal rotation arm 48, and a pin 51 formed on the seat cushion frame 31 from the rotation center point of the horizontal rotation arm 48.
Distance from the pivot point to the fluid 00 actuator 53
Is set to be longer than the distance to the mounting point, so that the forward and backward movement of the seat cushion 13 can be performed with a light force by the principle of leverage, and the fluid type actuator can be moved with respect to the amount of movement of the seat cushion frame 31 in the front and rear direction. The amount of expansion and contraction of 53 can be reduced, and the size of the fluid actuator 53 can be reduced.

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. 6A and 6B, the seat back 14 is supported by the tension spring 57 with the pivot 20a as a fulcrum.
Tilt backwards against

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.

Further, by pressing the lock release button 27 from the tilted state of the seat back 14 in FIGS. 6A and 6B to release the locked state of the actuator 25,
The front hinge bracket 23 of the seat back 14 is returned to the neutral state by the tension spring 57 shown in FIG. 5, 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 above-described structure shown in FIG.
Various modifications can be considered for each part of the vehicle seat 10. For example, in the above-described embodiment, the tilting operation of the seat back 14 is performed by the actuator 25. However, 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 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.

Further, one end of the horizontal rotating arm 48 is pivotally supported by the horizontal bracket 47 of the base frame 12, but instead of this, the horizontal plate 48b is pivotally supported by the side of the inclined plate 48c. Even if the hydraulic actuator 53 is attached to the, the same operation and effect as the above embodiment can be obtained.

[0039]

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 support portions are engaged with the elongated holes of the support brackets of the seat cushion, and one end of the horizontal rotation arm is connected to the one end. Since it is pivotally supported on the rear end side of the base frame and the other end is engaged with the seat cushion, the length between the lower end of this horizontal rotation arm and the front end of the base frame is adjusted by a fluid actuator. When the seat back is tilted backward, the lower end of the arm bracket rotates forward, and the pivots of the first link and the second link move forward along the elongated holes of the bracket of the seat cushion. The rear end of the seat cushion can be moved vertically by the rotation of the second link, and the seat cushion is released by releasing the locked state of the fluid actuator. The front and rear position of the seat cushion can be arbitrarily adjusted independently of the seat back. At this time, since the mounting position of the fluid actuator is near the pivotal support position of the horizontal rotation arm, the front and rear positions of the seat cushion are The movement can be performed with a light force, and the movement amount of the fluid actuator can be reduced with respect to the back and forth movement amount of the seat cushion.

According to the vehicle seat of the second aspect of the present invention, the fluid actuator can be directly mounted on the inclined plate portion of the horizontal rotation arm without providing a separate mounting bracket, and the mounting structure is simplified. It can be made.

According to the vehicle seat according to the third aspect of the present invention, since 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. 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 of a 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 lost 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 plan view of a vehicle seat according to the present invention.

FIG. 4 is a partial front view of the vehicle seat according to the present invention.

FIG. 5 is a schematic exploded perspective view showing a seat frame structure of a vehicle seat according to the present invention.

FIG. 6 is a side view of the vehicle seat according to the present invention in which the seat back is in a reclining state, in which FIG. 6A is a side view in a state where a seat cushion is in a rear most state, and FIG.

[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 Horizontal bracket 48 Horizontal rotating arm 51 Pin 53 Fluid actuator 54 Wire cable 55 Lock release button

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60N 2/00-2/54 A47C 1/02-1/038

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, comprising: a seat back provided on the base frame at a rear end side of the seat cushion, the seat back being 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, the shaft support is engaged with the elongated hole of the support bracket, and the rear of the base frame. One end of a horizontal rotating arm that rotates in a horizontal plane is supported on the other side, and the other end of the rotating arm is engaged with the seat cushion. A vehicle seat characterized in that a fluid actuator capable of locking and unlocking the telescopic state and unlocking the telescopic state is interposed between the front end of the arm and the front end of the vehicle. 2. The horizontal rotation arm is formed on an inclined plate portion between a position supported by a base frame and a position engaged with a seat cushion, and a fluid is provided at a position close to the supported position of the inclined plate portion. The vehicle seat according to claim 1, further comprising a type actuator. 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.