JP2891290B2 - 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. And a seat back supported on a support shaft that is erected on the base frame at the rear end side of the seat cushion and that can be tilted 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-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, in a conventionally known vehicle seat lifter mechanism, a seat cushion swings according to the physique and preference of a seated person irrespective of a seat back. In many cases, when the seat back is tilted, the occupant operates the lifter mechanism in accordance with the change in the seating posture and swings the seat back to the predetermined posture state. In addition, the structure including the operation unit becomes complicated, which is 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 fixed to the seat back, a 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, the other end of the first link and the other end of the second link are pivotally supported, and the bracket is connected to the bracket. Slidably engaged along the elongate hole,
A pivoting lever for locking is pivotally supported at a lower portion of the front end side of the seat cushion, and a plurality of locking portions are formed on the pivoting lever for locking at appropriate intervals in the front-rear direction. A locking pin selectively locked to the plurality of locking portions of the lever, and an elastic member for biasing the locking rotation lever in a direction in which the locking portion and the lock pin are engaged is provided. Features.

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

[0011]

According to the vehicle seat of the first aspect of the present invention, the first link and the second link are rotatably supported on the shaft, and the shaft support is slid along the elongated hole of the bracket of the seat cushion. Movably engaged, a pivoting lever for locking is pivotally supported at a lower portion of the front end side of the seat cushion, and a plurality of locking portions are formed on the locking pivoting lever at appropriate intervals in the front-rear direction; A lock pin is provided on the frame to be selectively locked to a plurality of locking portions of the locking rotation lever, and the locking rotation lever is urged in a direction in which the locking portion and the lock pin engage. Since the elastic member is provided, when the seat back is tilted backward, the lower end of the arm bracket rotates forward, and the pivotal support portions of the first link and the second link are connected to the bracket of the seat cushion. Move it forward along the slot By rotating the second link, the rear end of the seat cushion can be moved up and down, and by rotating the lock rotating lever against an elastic member, the locking portion thereof can be moved. The lock state between the seat cushion and the lock pin can be released, and in this state, the seat cushion can be moved back and forth by adjusting an arbitrary lock portion and the lock pin to face each other.

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.

[0013]

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 17 extending in the front-rear direction is formed at a central portion of the base frame 12, and a rear portion of the bracket 17 is formed to be curved upward so as to protrude toward a lower end of the seat back 14.

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 is pivotally supported by the rear end of the bracket 17 of the base frame 12.

The hinge bracket 23 of the back frame 21 is extended downward, and an actuator 2 such as a fluid pressure cylinder for tilting the seat back 14 in the seat longitudinal direction is provided at a lower end 23a of the hinge bracket 23.
5, one end 25a is connected, and the other end 25b is connected to the base frame 12 side.

A pair of left and right arm brackets 32 is fixed to the support shaft 20a of the back frame 21, and 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.

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.

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 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 inserted into the elongated hole 44 of the bracket 42, respectively.

As shown in FIG. 3, a pair of front and rear brackets 47 provided at a lower portion on the front end side of the cushion frame 31.
Locking levers 46, which extend in the front-rear direction and constitute a locking mechanism, are rotatably attached to a and 47b by pivot pins 49. The lock rotation lever 46 is disposed at a position where the front frame of the base frame 12 can be loosely fitted. A locking portion 48 composed of a plurality of lock grooves is formed on the rear end side upper surface of the locking rotation lever 46,
A grip 46a is formed on the front end side.

The locking portion 4 formed of a plurality of locking grooves of the locking rotation lever 46 is provided on the base frame 12.
The lock pin 51 selectively locked to the bracket 8
2 fixed.

Between the rear end of the locking rotary lever 46 and the mounting bracket 53 fixed to the cushion frame 31, the locking portion 48 of the locking rotary lever 46 and the lock pin 51 are engaged. A coil spring 54 is inserted as a biasing elastic member.

A tension spring is stretched between the seat cushion 13 and the rear end of the base plate 12, and the mounting portion of the tension spring 50 has a play. The urging force of the tension spring 50 acts so that the urging force of the tension spring 50 acts when the seat back 14 does not act and the seat back 14 becomes a predetermined inclination angle or more. Further, the seat back 14 is configured to maintain a substantially upright state by a link mechanism including the first and second links 35 and 37 and the like.

According to this configuration, as shown in FIGS. 5A and 5B, the lower end of the arm bracket 32 is rotated by the forward and backward tilting of the seat back 14, so that the first link 35 and the Seat cushion 1 with two links 37
The rear end of the bracket 3 can be moved in the vertical direction, and the pivot pin 39 as a shaft support of the first link 35 and the second link 37 can slide along the elongated hole 44 of the bracket 42.

Also, as shown in FIGS. 4 (a) and 4 (b), the locking pivot lever 46 is moved by a spring 54 within a range in which the pivot pin 39 can be slid along the elongated hole 44 of the bracket 42. The seat cushion 13 can be adjusted in the front-rear position by turning the locking portion 48 out of the engagement state with the lock pin 51 by rotating the seat cushion 13 against the seat cushion 13.

Then, by releasing the turning power to the locking rotation lever 46 at the desired front-rear position, the locking rotation lever 46 is returned clockwise by the spring 54, and the lock pin 51 is locked in the locked state. Returns to the state. At this time, since the lock groove is a tapered groove, the lock pin 51 is guided by the tapered groove, so that the lock position is accurately controlled.

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.

[0029]

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 rotatably supported on the shaft, and the shaft supports are slidably engaged along the long holes of the brackets of the seat cushion. A pivoting lever for locking is rotatably supported at a lower portion on the front end side of the vehicle, and a plurality of locking portions are formed on the locking pivoting lever at appropriate intervals in the front-rear direction. The locking portion is provided with a lock pin that is selectively locked, and an elastic member that urges the locking rotation lever in a direction in which the locking portion and the lock pin engage with each other is provided. Therefore, when the seat back is tilted backward, the lower end of the arm bracket rotates forward,
The pivot portions of the first link and the second link can be moved forward along the long holes of the bracket of the seat cushion, and the rear end of the seat cushion can be moved vertically by the rotation of the second link. The locking state of the locking portion and the lock pin can be released by rotating the locking rotation lever against the elastic member, and in this state, any locking portion and the locking pin can be released. By facing the pin, the seat cushion can be moved back and forth.

According to the vehicle seat according to 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 adjustment mechanism is used. The front-back movement of the seat cushion can be performed smoothly.

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 17 Bracket 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 Second Link 39 Pivot pin 40L Slider 40R Slider 42 Bracket 44 Elongate hole 46 Rotating lever 46a Locking portion 47a Bracket 47b Bracket 48 Locking portion 49 Pivot pin 50 Tension spring 51 Lock pin 52 Bracket 53 Bracket 54 Coil spring

Continuation of the front page (56) References JP-A-52-13223 (JP, A) JP-A-61-249844 (JP, A) JP-A-59-196345 (JP, U) JP-A-57-70936 (JP, A) , U) Japanese Utility Model Showa 59-195027 (JP, U) Japanese Utility Model Hei 1-114838 (JP, U) Japanese Utility Model Showa 62-193452 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB Name) B60N 2/00-2/54

Claims (2)

(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 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 one end of a second link is connected to the base frame side. Supporting the other end of the first link,
And the other end of the second link is rotatably supported, and the shaft support is slidably engaged along the long hole of the bracket, and a locking rotation lever is provided at a lower front end side of the seat cushion. A plurality of locking portions are formed at the locking rotary lever at appropriate intervals in the front-rear direction, and are selectively locked to the plurality of locking portions of the locking rotary lever on the base frame. And a resilient member for urging the lock rotation lever in a direction in which the locking portion and the lock pin engage with each other. 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.