JPH09103333A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust longitudinal movement of a seat cushion aside from a reclining mechanism by accomplishing a swing action of the seat cushion according to the longitudinal tilting of a seat back to expand a hip angle by preventing a hip sliding. SOLUTION: One end of a first link 35 is pivoted on the side of the lower end of an arm bracket 32 fastened on a seat back 14 while one end of a second link 37 is pivoted on a base frame 12 and both the links 35 and 37 are linked rotatably. A pivot part 39 is engaged with a slot 44 of a bracket 42 of a seat cushion 13. A rotary arm 48 is pivoted on the front end side of the base frame 12 at a position closer to the lower end thereof, the upper end part on the long-sized side is engaged with the seat cushion 13 and a fluid type actuator 53 is interposed between the lower end on the short-sized side and the rear end of the base frame 12.

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 according to the change in the seating posture to swing the seat back to a predetermined posture state, which causes a problem in terms of operability. The included structure became complicated and 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,
Adopting a simple swing mechanism that allows the seat cushion to swing, preventing hip slip and expanding the hip angle in the operating angle range of forward and backward tilt of the seat back, and excellent support from the pelvis to the thoracic spine Another object of the present invention is to obtain a vehicle seat in which the seat cushion can be easily moved back and forth separately from the reclining mechanism.

[0009]

The present invention has been made in view of the above-mentioned problems, and a vehicle seat according to claim 1 of the present invention is a base frame supported on a footrest, and the base. A vehicle seat including: a seat cushion supported on a frame; and 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. An arm bracket is fixed to the seat back, a support bracket having a long hole extending in the front-rear direction is provided at a lower portion of a rear end side of the seat cushion, and one end of a first link is pivotally supported on a lower end side of the arm bracket, One end of the second link is rotatably supported on the base frame side, the other end of the first link and the other end of the second link are rotatably rotatably supported, and the rotatably supporting part is supported by the support block. And a pivot center of the pivot arm near the lower end of the pivot frame is pivotally supported on the front side of the base frame, the upper end of the pivot arm is engaged with the seat cushion, and the lower end and It is characterized in that a fluid type actuator capable of locking and releasing the expanded and contracted position is inserted between the base frame and the rear end of the base frame.

According to the vehicle seat of the present invention, the first link and the second link are rotatably pivotally supported, and the pivotal support portion is engaged with the elongated hole of the support bracket of the seat cushion. A rotating arm whose upper end is engaged with a seat cushion is pivotally supported on the base frame, and the length between the lower end of the rotating arm and the rear end of the base frame is adjusted by a fluid actuator. Therefore, when the seat back is tilted backward, the lower ends of the arm brackets rotate forward, and the pivotal support portions of the first link and the second link move forward along the elongated holes of the bracket of the seat cushion. By rotating the second link, the rear end of the seat cushion can be moved in the vertical direction, and by releasing the locked state of the fluid actuator, the seat can be closed. The longitudinal position of the 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.

According to a second aspect of the present invention, in the vehicle seat according to the first aspect, a 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. And

According to the vehicle seat of the second aspect, since 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 hydraulic actuator is unlocked. The seat cushion can be moved back and forth smoothly.

A vehicle seat according to a third aspect of the present invention is the vehicle seat according to the first or second aspect, wherein the fluid actuator is unlocked by an unlock portion provided on the armrest. To do.

According to the vehicle seat of the present invention, the locked state of the fluid actuator can be released by the unlock portion provided in the armrest.
The front and rear position of the seat cushion can be easily adjusted.

[0015]

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

The vehicle seat 10 is provided with a base frame 12 supported by a footrest 11 placed on the floor of a vehicle compartment or the like, and 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 curved upward so as to project toward a lower end of the seat back 14, and right and left end portions thereof are respectively formed. The 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 is provided with the bracket 16 and the armrest 1 of the base frame 12.
7 at the rear end.

The hinge bracket 23 of the back frame 21 is extended downward, and one end 25a of an actuator 25 such as a fluid pressure cylinder for tilting the seat back 14 in the front-rear direction is mounted on a 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 unlocking the lock is connected to a lock releasing button 27 formed on the side surface of the armrest 17 on the upper side.
The lock state of the actuator 25 is released by pressing, and the lock state is restored by releasing the press. Reference numeral 28 is a stopper that 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 are fixed to the support shaft 20a of the back frame 21, and one end of a first link 35 is pivotally supported at the lower ends of the pair of left and right arm brackets 32, and the base frame 12 side. To the 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 an elongated hole 41a extending in the front-rear direction and through which the base frame 12 is inserted is provided in the lower portion of the seat cushion frame 31 on the front end side in the front-rear direction. A pair of left and right brackets 42 having elongated holes 44 are provided. The pivot pin 39 as a pivotal support portion of the first link 35 and the second link 37 has the bracket 4
The two elongated holes 44 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, 40R as sliding guide portions fixed to the upper surface of the front end portion of the base frame 12, respectively. Has been done. The sliders 40L and 40R include an arc-shaped guide plate portion 40a and left and right side plate portions 40b standing on both sides thereof.
40c, and the left and right side plate portions 40b and 40c regulate the movement of the base frame 12 in the left-right direction.

As shown in FIG. 3, a pivot arm 48 is attached to a bracket 47 provided at the center rear portion of the front end side frame of the base frame 12 and a pin 4 is provided at a pivot center point position near the lower end thereof.
It is pivotally supported by 8a. A long hole 48b is formed at the upper end of the rotation arm 48 on the long side, and the long hole 48b is formed.
A pin 51 inserted into a bracket 50 provided in a 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 rotating arm 48 on the shorter side and a bracket 52 formed at the center of the rear end side frame of the base frame 12 and its release. A fluid-type actuator 53 such as a fluid pressure cylinder is inserted.

In the fluid type actuator 53, a wire cable 54 containing an inner cable for unlocking is connected to a lock releasing button 55 formed on the upper side surface of the armrest 17, and the lock releasing button 55 is pressed. Therefore, 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 pivotal pins 39 of the first link 35 and the second link 37 and the rear end side of the base plate 12, and the urging force of the tension spring 57 causes the seat to move. Back 14
Is configured to maintain a neutral state in which it is substantially erected by a link mechanism including the first link 35, the second link 37, and the like.

With this structure, assuming that the seat back 14 is in a substantially upright neutral state as shown in FIG. 1, when the seated person is seated in this state, the seat cushion 13 is operated by the fluid actuator 53. Is locked, 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 preference of the seated person, by pressing the lock release button 55 formed on the armrest 17 in the seated state, the wire cable 54 is used. The locked state of the fluid actuator 53 is released.

Therefore, when the seated person moves his / her waist in the seated state, the cushion frame 31 is guided by the sliders 40L and 40R as shown in FIG. 2, and both ends of the elongated hole 44 of the support bracket 42 are pivotally supported by the pivot pin 39. Can be moved back and forth until it comes into contact with the seat cushion 13. By releasing the pressing of the lock release button 55 at a desired front and rear position, the fluid actuator 53 is locked and the front and rear position of the seat cushion 13 is fixed. It

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

Further, the seat back 1 shown in FIGS. 1 and 2.
4 is tilted rearward from the neutral state, the lock release button 27 formed on the armrest 17 is pushed in the seated state to release the locked state of the actuator 25, and then the seat back 14 is pushed backward by the back. As a result, the seat back 14 tilts rearward against the tension spring 57 with the pivot 20a as a fulcrum, as shown in FIGS.

At this time, the lower end of the arm bracket 32 is rotated clockwise by tilting the seat back 14 rearward, and the rear end of the seat cushion 13 is moved downward by the first link 35 and the second link 37. Move to.
Even in this state, the first link 35 and the second link 37
The pivot pin 39 serving as the shaft support can be slid in the front-rear direction along the elongated hole 44 of the bracket 42.

When the lock release button 27 is pushed from the tilted state of the seat back 14 of FIGS. 4 and 5 to release the locked state of the actuator 25, the seat back 14 is moved by the tension spring 57 as shown in FIG.
Returns to the neutral state in which the front hinge bracket 23 engages with the stopper 28, and at the same time, the rear end of the seat cushion 13 rises.

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 modified or changed as necessary, and each part of the vehicle seat 10 can be freely modified. Various modifications are conceivable. 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 adopted as long as the seat back 14 can be tilted.

Further, 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 first link and the second link are rotatably rotatably supported, the shaft support is engaged with the elongated hole of the support bracket of the seat cushion, and the upper end is engaged with the seat cushion. The pivot arm is pivotally supported on the base frame, and the length between the pivot arm and the rear end of the base frame is adjusted by the fluid actuator, so that the seat back is tilted backward. In this case, the lower end of the arm bracket rotates forward, and the pivotal support portions of the first link and the second link can be moved forward along the elongated hole of the bracket of the seat cushion.
By rotating the link, the rear end of the seat cushion can be moved in the vertical direction, and by releasing the locked state of the fluid actuator, the front and rear position of the seat cushion can be adjusted independently of the seat back. In this case, the amount of expansion and contraction of the fluid actuator can be made smaller than the amount of forward and backward movement of the seat cushion.

According to the vehicle seat of the second aspect of the present invention, since 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-rear position adjusting mechanism is used. The seat cushion can be moved back and forth smoothly.

According to the vehicle seat of the third aspect of the present invention, since the lock state of the fluid actuator can be released by the lock release portion provided in the armrest, the front and rear position adjustment of the seat cushion is easy. Can be done.

Further, according to the present invention, a simple swing mechanism capable of swinging the seat cushion in conjunction with the tilting movement of the seat back toward the back side is adopted, and the operating angle of the seat back-and-forth tilting is adopted. Within the range, it is possible to obtain a vehicle seat that prevents slippage of the hips, expands the hip angle, has an excellent support state from the pelvis to the thoracic spine, and can adjust the seat cushion forward and backward 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 with a seat back in a normal seated state and a seat cushion in a rear most state.

FIG. 2 is a side view of a vehicle seat according to the present invention with a seat back in a normal seated state and a seat cushion in a front most 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 a vehicle seat according to the present invention with a seat back in a reclining state and a seat cushion in a rear most state.

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

[Explanation of symbols]

 10 Vehicle Seat 12 Base Frame 13 Seat Cushion 14 Seat Back 16 Bracket 17 Arm Rest 18 Rotation Mechanism 20 Reclining Mechanism 20a Spindle 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 Long hole 47 Bracket 48 Rotating arm 53 Fluid actuator 54 Wire cable 55 Lock release button 57 Tension spring

Claims (3)

[Claims] A base frame supported on a footrest;
A seat cushion supported on the base frame,
In a vehicle seat including a seat back that is erected on the 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, an arm bracket is fixed to the seat back. A support bracket having an elongated hole extending in the front-rear direction is provided at a lower portion of 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 one end of a second link is provided at the base frame side. Is pivotally supported, 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 front of the base frame is supported. Side of the pivot arm is pivotally supported near the lower end of the pivot arm, the upper end of the pivot arm is engaged with the seat cushion, and the retracted position is between the lower end and the rear end of the base frame. A vehicle seat in which a fluid type actuator capable of locking and unlocking the vehicle is inserted. 2. The vehicle seat according to claim 1, wherein a 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. 3. The vehicle seat according to claim 1, wherein the fluid actuator is unlocked by an unlock portion provided on an armrest.