JP2003024166A - Vehicle seat - Google Patents

Abstract

(57) [Summary] [Problem] To swing a seat cushion in conjunction with a tilting operation of a seat back. Reduce the number of welded fixing brackets and reduce welding costs. Prevents distortion due to welding. SOLUTION: One end of a first link 35 is pivotally supported on a lower end side of an arm bracket 32, and one end of a second link 37 is pivotally supported on a base frame 12, and both links 35 and 37 are rotatably connected. The shaft support 39 is connected to the long hole 4 of the bracket 42.
4 is engaged. The upper end of the third link 48 is pivotally supported by the cushion frame 31, and the front end 25 b of the hydraulic actuator 25 is pivotally supported by the lower end of the third link 48. Rear end 2
5 a is pivotally supported at the rear end of the base frame 12. The front end of the fourth link 51 is pivotally supported above the pivot position of the front end 25b of the third link 48. The rear end of the fourth link 51 is pivotally supported on 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, railway vehicles,
More specifically, the base frame, the seat cushion supported in a substantially horizontal posture on the base frame, and the seat cushion standing upright on the rear end side of the seat cushion on the base frame, the seat front-rear direction. And a seat back supported by a support shaft so as to be tiltable.

[0002]

2. Description of the Related Art Generally, a vehicle seat comprises a seat cushion and a seat back standing upright behind the seat cushion.
In addition, the seat back is configured to be tiltable in the front-rear direction of the seat by a reclining mechanism, or the seat frame supporting the entire seat is supported on the floor surface of the vehicle body by a front-rear slide device or the like to adjust the movement in the front-rear direction of the vehicle body. The occupant's body shape and preferences are adjusted so that a proper sitting state for the occupant can be obtained.

Further, in recent years, the seat cushion portion of the seat is supported via a lifter mechanism such as a parallel link mechanism, which is translated in the vertical direction, or the front end of the slide rail is curved upward. Various seats for vehicles have been proposed in which the seat cushion can be adjusted more appropriately by swinging the seat cushion accordingly.

That is, in this type of vehicle seat, the seat cushion is moved such that its front end portion is moved diagonally upward in front of the seat and its rear end portion is lowered to the lower side of the seat. When the swing motion is performed, the forward displacement of the hip portion of the seated person can be prevented, and an effect can be exhibited in obtaining a stable seated state.

In particular, such a swinging motion of the seat cushion makes it easier for the seated person to shift the seating position, as in the case where the seat back is tilted toward the seat back side.
It is effective when adopted when the sitting posture becomes unstable.
As such a vehicle seat, Japanese Patent No. 313717
No. 5 (Japanese Patent Laid-Open No. 9-103333) exists. In the vehicle seat of this Japanese Patent No. 3137175, a plurality of brackets for attaching a plurality of components such as a plurality of links and fluid type actuators are welded to a base frame at a plurality of locations.

[0006]

However, in the conventionally known lifter mechanism for a vehicle seat, the seat cushion is swung according to the physique and preference of the seated person, regardless of the seat back. Many things,
When the seat back is tilted, the seat occupant operates the lifter mechanism according to the change in the seating posture and swings 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, there is also known a rotary seat for a railway vehicle in which the direction of the seat can be changed and adjusted according to the preference and demand of a seated person, but these seats are also known. Is provided with a rotation adjusting mechanism such as a surface rubbing type and a shaft-up rotating type, which is interposed below the seat body and with the floor surface of the passenger compartment. However, the swing mechanism of No. 1 cannot be easily applied.

Further, in the vehicle seat of Japanese Patent No. 3137175, a plurality of fixing brackets for attaching a plurality of components such as a plurality of links and fluid type actuators are welded to a base frame, a cushion frame and the like at a plurality of locations. However, the welding cost is increased, and there are many welding points, which may cause distortion due to welding.
In addition, there is a risk that a vertical link that moves the cushion frame back and forth may project to the seating surface, and it is not possible to secure a sufficient thickness of the pad material and it is not possible to improve the sitting comfort. It was

An object of the present invention is to employ a simple swing mechanism capable of swinging a seat cushion in conjunction with a tilting movement of the seat back toward the back side, and in a working angle range of tilting the seat back forward and backward. Prevents slippage of the hips and reduces the number of welded fixed brackets.
Welding cost can be reduced, distortion due to welding can be prevented, a pad material with a sufficient thickness can be used, and sitting comfort can be improved. Is provided.

[0010]

The present invention has been made in view of the above problems, and a vehicle seat according to claim 1 of the present invention includes a base frame and a seat supported on the base frame. A vehicle seat including a cushion and 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, the back frame of the seat back. An arm bracket is fixed to the seat cushion, a support bracket having a long hole extending in the front-rear direction is provided at the lower rear end side of the cushion frame of the seat cushion, and one end of the first link is pivotally supported on the lower end side of the arm bracket. One end of the 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 pivoted by a pivot pin. And the pivot pin is engaged with the elongated hole of the support bracket, the upper end of the third link is pivotally supported by the cushion frame, and the lower end of the third link is in the extended position in the locked state and The front end of the fluid type actuator which can be released is pivotally supported, and the rear end of the fluid type actuator is pivotally supported on the rear end part of the base frame.
The front end of the fourth link is pivoted above the pivot position of the front end of the fluid actuator of the link, and the rear end of the fourth link is pivotally supported on the rear end of the base frame. To do.

In the vehicle seat according to the second aspect of the present invention, a small hole is formed in the cushion frame that pivotally supports the upper end of the third link, and the upper end of the third link is pivotally supported by the pin hole. It is characterized by

A vehicle seat according to a third aspect of the present invention is characterized in that the fourth link is provided in a pair on the left and right with the fluid actuator interposed therebetween.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A vehicle seat according to the present invention will be described in detail below with reference to the drawings. 1 and 2 respectively show an embodiment of a vehicle seat according to the present invention. A vehicle seat 10 in this embodiment is, for example, two or three seating seats such as bench-type seats. A case will be described where the present invention is applied to a rotary seat in which parts are arranged in series, but the present invention is not limited to such a seat structure.

The vehicle seat 11 has a seat cushion 13
A seat cushion 13 is supported on a base frame 12 that is provided with a seat back 14 and is supported by a footrest or the like placed on the floor surface of the passenger compartment. The seat cushion 1
A rotation mechanism that supports the vehicle seat 11 in a rotationally adjustable manner can be provided below the base frame 12, which is below the vehicle body 3.

Back frame 2 of the seat back 14
The hinge bracket 23 is formed on the lower part of the side of 1,
The hinge bracket 23 is provided with a support shaft 20a on the seat back 14 side that serves as a rotation center of the reclining mechanism 20.

A pair of left and right hinge brackets 23 of the back frame 21 are extended downward, and a pair of left and right arm brackets 32 for tilting the seat back 14 in the front-rear direction are provided at a lower end 23a of the hinge bracket 23. It is fixed.

Further, one end 25a of an actuator 25 such as a fluid pressure cylinder is connected to the rear end of the base frame 12 by a pivot pin 53, and the other end 25b is located on the front side of the base frame 12 side.
It is connected to a third link 48 described later on the side.

The actuator 25 is constructed so that the lock state of the actuator 25 is released by pressing a lock release button (not shown), and the lock state is restored by releasing the press.

One end of the first link 35 is pivotally supported by the lower ends of the pair of left and right arm brackets 32 below the support shaft 20a of the back frame 21.
One end of the second link 37 is pivotally supported on the second side, and
The other end of the link 35 and the other end of the second link 37 are rotatably supported by a pivot pin 39.

A pair of left and right brackets 42 each having an elongated hole 44 extending in the front-rear direction are provided on the lower portion of the seat cushion frame 31 of the seat cushion 13 on the rear end side. The pivot pin 39 as a shaft support portion of the first link 35 and the second link 37 is provided in the long 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. Has been done. The sliders 40L and 40R are provided with arcuate guide plate portions 40a.

As shown in FIG. 1, an upper end of a third link 48 is pivotally supported by the cushion frame 31, and a small circular small hole 48a is formed in the cushion frame 31 pivotally supporting the upper end of the third link 48. , In this small hole 48a
The upper end of the link 48 is pivotally supported by the pin 48b.

At the lower end of the third link 48, the front end of the fluid type actuator 25 which can lock and unlock the extended position and is unlocked is pivotally supported. The front end of the fourth link 51 is pivotally supported by a pivot pin 52 above the pivot position of the front end of the fluid actuator 25 of the third link 48, and the rear end of the fourth link 51 is the base frame. It is pivotally supported at the rear end of 12 by a pivot pin 53.

As shown in FIG. 2, a pair of left and right fourth links 51 are provided on both sides of the fluid actuator 25. Then, the first link 35 and the second link 3
The tension spring 57 is stretched between the pivot pin 39 of No. 7 and the rear end side of the base plate 12, and the seat back 14 is moved to the first position by the urging force of the tension spring 57.
The link mechanism including the link 35, the second link 37, and the like is configured to maintain a substantially upright neutral state.

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 provided with the fluid type actuator 53. Is locked, its front and rear positions are fixed.

As shown by the solid line in FIG. 1, when the seat back 14 is tilted rearward from the neutral state, the actuator 2 is pushed by pressing a lock release button or the like.
After releasing the locked state of 5, seat back 14 with your back
By pushing backward, the seat back 14 tilts backward against the tension spring 57 with the pivot 20a as a fulcrum, as shown by an imaginary line in FIG.

At this time, the lower end of the arm bracket 32 is rotated clockwise by the rearward tilting of the seat back 14, and the rear end of the seat cushion 13 is moved downward by the first link 35 and the second link 37. Move to.
Further, the third link rotates counterclockwise about the pivot pin 52 and moves the cushion frame 31 forward.

A pivot pin 39 as a pivotal support of the first link 35 and the second link 37 slides in the front-rear direction along the elongated hole 44 of the bracket 42. When the cushion frame 31 moves back and forth, the front end side of the cushion frame 31 moves linearly by being guided by the arc-shaped guide plate portions 40a of the sliders 40L and 40R, and the pivot pin 53 of the one end 25a of the actuator 25 is moved. The upper end of the third link 48 does not project upward from the upper end of the cushion frame 31.

When the lock release button or the like is pressed from the tilted state of the seat back 14 to release the locked state of the actuator 25, the tension spring 57 causes the hinge bracket 23 in front of the seat back 14 to move as shown in FIG. The neutral state is restored, 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 needed, and each part of the vehicle seat 11 can be freely modified. Various modifications are conceivable. For example, in the embodiment described above, the tilting operation of the seat back 14 is performed by the actuator 25, but the present invention is not limited to this.
Various means may be adopted as long as the seat back 14 can be tilted.

[0031]

As described above, according to the first aspect of the present invention.
According to the vehicle seat of the present invention, the arm bracket is fixed to the back frame of the seat back, and the support bracket having the elongated hole extending in the front-rear direction is provided at the lower rear end side of the cushion frame of the seat cushion. One end of the first link is pivotally supported on the lower end side, and one end of the second link is pivotally supported on the base frame side.
The other end of the link and the other end of the second link are rotatably supported by a pivot pin, the pivot pin is engaged with an elongated hole of the support bracket, and the cushion frame is provided with a third link of the third link. The upper end is pivotally supported, and the lower end of the third link is pivotally supported by the front end of a fluid actuator capable of locking and releasing the telescopic position, and the rear end of the fluid actuator is supported by the rear end of the base frame. Pivotally supports the front end of the fourth link above the pivot position of the front end of the fluid actuator of the third link, and attaches the rear end of the fourth link to the rear end of the base frame. Since it is pivotally supported, 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 long holes of the bracket of the seat cushion. Can be moved, Adopts a simple swing mechanism that allows the seat cushion to perform a swing operation, prevents tail slip in the operating angle range of the seat back forward and backward tilt, reduces the number of welded fixed brackets, and reduces welding costs. It is possible to prevent distortion due to welding.

According to the vehicle seat of the second aspect of the present invention, a small hole is formed in the cushion frame that pivotally supports the upper end of the third link, and the upper end of the third link is in the small hole. Since it is supported, there is no possibility that the upper end of the third link will move in the vertical direction when the seat back tilts forward and backward, and a pad material with a sufficient thickness can be used to improve the sitting comfort. Is.

According to the vehicle seat of the third aspect of the present invention, since a pair of the fourth link is provided on the left and right sides of the fluid actuator, the locked state and the unlocked state of the fluid actuator are provided. Can be reliably transmitted to the seat cushion, and the front and rear position adjustment of the seat cushion can be performed simply, quickly and reliably.

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 prevent tail slip, reduce the number of welded fixed brackets, reduce welding cost, prevent distortion due to welding, and use a pad material with sufficient thickness. Thus, it is possible to obtain a vehicle seat that is excellent in economy and that can improve the sitting comfort.

[Brief description of drawings]

FIG. 1 is a side view showing a seat back of a vehicle seat according to the present invention in a normal seated state and a state in which the seat back is rotated rearward.

FIG. 2 is an explanatory plan view of a vehicle seat according to the present invention on a base frame side.

[Explanation of symbols]

11 Vehicle seat 12 base frame 13 seat cushion 14 seat back 20 Reclining mechanism 20a spindle 21 back frame 23 Hinge bracket 25 actuators 31 cushion frame 32 arm bracket 35 First Link 37 Second Link 39 pivot pin 40L slider 40R slider 40a arc-shaped guide plate 42 Support bracket 44 slot 48 Third Link 48a small hole 48b pin 51 Fourth Link 52 pivot pin 53 pivot pin 57 Tension spring

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yutaka Takizawa             771 Koen, Ayase-shi, Kanagawa Johnson               Controls Automotive Systems             Inside Stems Corporation (72) Inventor Shin Nakamura             Nisshin 5-14-25 Toyota, Minami-ku, Nagoya-shi, Aichi             Spinning Co., Ltd. Nagoya factory F-term (reference) 3B087 BD03 BD13                 3B099 AA05 BA08 CA35 CA36 DA04

Claims (3)

[Claims] 1. A base frame, a seat cushion supported on the base frame, and a support shaft which is erected on the rear end side of the seat cushion on the base frame and is tiltable in the front-back direction of the seat. A vehicle seat including a seat back, wherein an arm bracket is fixed to a back frame of the seat back, and a support bracket having an elongated hole extending in the front-rear direction is provided in a lower portion of a rear end side of the cushion frame of the seat cushion, 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 and the other end of the second link are pivotally supported. It is pivotally supported by a pin, the pivot pin is engaged with the elongated hole of the support bracket, and the cushion frame is provided with a third link of the third link. The end is pivotally supported, third
A front end of a fluid type actuator capable of locking and releasing the expansion position in the locked state at the lower end of the link, and a rear end of the fluid type actuator at the rear end portion of the base frame; A vehicle in which the front end of a fourth link is pivoted above the pivot position of the front end of the fluid type actuator, and the rear end of the fourth link is pivotally supported on the rear end of the base frame. Sheet. 2. A small hole is formed in a cushion frame that pivotally supports the upper end of the third link, and the upper end of the third link is pin-supported in the small hole. Vehicle seats. 3. The vehicle seat according to claim 1, wherein a pair of the fourth links are provided on the left and right sides with the fluid actuator interposed therebetween.