JPH08282351A - Seat for vehicle - Google Patents

Abstract

PURPOSE: To accomplish prevention of a slip of a hip and expansion of a hip angle and to longitudinally move and adjust a seat cushion separately from a reclining mechanism by swinging the seat cushion according to a longitudinal inclination of a seat back. CONSTITUTION: An arm bracket 32 is fixed in a seat back 14. One end of the first link 35 is journalled to the lower end side of the arm bracket 32 while one end of the second link 37 is journalled to a base frame 12, and the first link 35 and the second link 37 are connected together rotationally. A journal part 39 is engaged along a long hole 44 in a bracket in a seat cushion 13. A rotational lever 46 for locking is pivoted to the rear end side lower part of the seat cushion 13, and a lock pin 51 fixed in the base frame 12 is locked in either of a plurality of locking parts 48 formed in the lever 46, and then, a longitudinal position for the seat cushion 13 is adjusted.

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, and more specifically, a base frame supported on a pedestal and a base frame on the base frame. And a seat back supported in a substantially horizontal posture, 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 that can tilt in the front-back direction of the seat. The present invention relates to a vehicle seat.

[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 longitudinal direction of the seat 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 longitudinal slide device or the like to adjust the movement in the longitudinal direction of the vehicle body. By adopting such a configuration, it is possible to deal with the body shape and taste of the seated person and obtain a seated state suitable for the seated person.

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 is adopted when the seated position of the seated person is easily displaced and the seating posture becomes unstable, as in the case where the seat back is tilted toward the seat back side. It is effective.

[0005]

However, in the conventionally known vehicle seat lifter mechanism, the seat cushion is swung according to the physique and preference of the seated person, regardless of the seat back. Many of them are seated, and when the seat back is tilted, the occupant operates the lifter mechanism to swing the seat back according to the change in the seating posture, causing a problem in terms of operability. In addition, the structure including the operation section became complicated, which was a problem in practical use.

As a vehicle seat, for example, a rotary seat for a railway vehicle is known in which the direction of the seat can be changed and adjusted according to the preference and demand of a seated person. The swing mechanism of the seat cushion described above cannot be easily applied to the rotary seat.

That is, as a rotary type vehicle seat of this type, a rotation adjusting mechanism such as a surface rubbing type or a shaft-up rotary type is provided below the seat body and between the floor and the passenger compartment floor. However, the lifter mechanism as described above cannot be applied as it is.

The present invention has been made in view of the above circumstances, and is interlocked with the tilting movement of the seat back toward the rear side.
Adopting a simple swing mechanism that allows the seat cushion to swing, preventing hip slip in the operating angle range of the seat back forward and backward tilt, expanding the hip angle, 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 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 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, 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 supported part is the bracket. Slidably engaged along the elongate hole,
A pivoting lever for locking is pivotally supported on the lower part of the front end side of the seat cushion, and a plurality of locking portions are formed at appropriate intervals in the front-rear direction on the pivoting lever for locking. A lock pin that is selectively locked to a plurality of locking portions of the lever is provided, and an elastic member that biases the locking rotation lever in a direction in which the locking portion and the lock pin are engaged is provided. Characterize.

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 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

[0011]

According to the vehicle seat of the first aspect of the present invention, the first link and the second link are rotatably rotatably supported, and the rotatably supported portion is slid along the elongated hole of the bracket of the seat cushion. Movably engaged, a pivoting lever for locking is pivotally supported on the lower part of the front end side of the seat cushion, and a plurality of engaging portions are formed on the pivoting lever for locking at an appropriate interval in the front-rear direction. The frame is provided with a lock pin that is selectively locked to a plurality of locking portions of the lock rotation lever, and the lock rotation lever is urged in a direction in which the lock portion and the lock pin are engaged with each other. Since the elastic member is provided, when the seat back is tilted rearward, the lower end of the arm bracket rotates forward, and the pivotal support portions of the first link and the second link move to the seat cushion bracket. Move it forward along the slot By rotating the second link, the rear end of the seat cushion can be moved in the vertical direction, and by rotating the lock rotating lever against the elastic member, the locking portion thereof can be obtained. The locking state between the lock pin and the lock pin can be released, and in this state, the seat cushion can be adjusted in the front-rear direction by causing the lock pin and the lock pin to face each other.

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.

[0013]

1 to 5 show an embodiment of a vehicle seat according to the present invention. In this embodiment, a vehicle seat 10 comprises two or three such as a bench type seat.
A case will be described in which the individual seating seat portions are applied in series to a rotary seat, 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 placed on a floor 15 of a passenger compartment, 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 curved upward so as to project toward a lower end of the seat back 14.

The vehicle seat 1 is provided between the base frame 12 below the seat cushion 13 and the passenger compartment floor surface 15.
A rotation mechanism 18 that supports 0 for rotation adjustment is provided,
The entire vehicle seat 10 is configured to be rotatable and adjustable in the horizontal direction about the rotation mechanism 18, and the direction thereof can be changed to an arbitrary direction.

Back frame 2 of the seat back 14
The hinge bracket 23 is formed on the lower part of the side of 1,
A support shaft 20a on the seat back 14 side, which is the center of rotation 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 on 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 mounted on the 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 are fixed to the support shaft 20a of the back frame 21, and one ends of the first links 35 are pivotally supported at the lower ends of the pair of left and right arm brackets 32, respectively, 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.

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 slider 40 has an arc-shaped guide plate portion 40a.
And left and right side plate portions 40b and 40c provided upright on both sides thereof, and 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 elongated holes 44 extending in the front-rear direction are provided on the lower portion of the cushion frame 31 of the seat cushion 13 on the rear end side. Pivot pins 39, which serve as shaft supports of the first link 35 and the second link 37, are slidably inserted into the elongated holes 44 of the bracket 42, respectively.

As shown in FIG. 3, a pair of front and rear brackets 47 provided on the lower portion of the cushion frame 31 on the front end side.
A rotation lever 46 for locking, which constitutes a lock mechanism and extends in the front-rear direction, is pivotally attached to a and 47b by a pivot pin 49. The locking rotation lever 46 is arranged at a position where the front frame of the base frame 12 can be loosely fitted. The locking rotation lever 46 has a locking portion 48 formed of a plurality of locking grooves on the upper surface on the rear end side thereof.
A grip portion 46a is formed on the front end side.

Further, the base frame 12 has a locking portion 4 formed of a plurality of lock grooves of the locking rotary lever 46.
The lock pin 51 that is selectively locked to the bracket 8 is the bracket 5.
It is fixed by 2.

Between the rear end of the lock turning lever 46 and the mounting bracket 53 fixed to the cushion frame 31, the locking portion 48 of the lock turning lever 46 and the lock pin 51 are engaged with each other. A coil spring 54 as an elastic member that urges is inserted.

Since a tension spring is stretched between the seat cushion 13 and the rear end side of the base plate 12, and the mounting portion of the tension spring 50 has a play, the tension spring 50 has a biasing force. It is provided so that the biasing force of the tension spring 50 acts when the seat back 14 does not act and the seat back 14 has a predetermined tilt 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, 37 and the like.

According to this structure, 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, and the first link 35 and the first link 35. 2 link 37 seat cushion 1
The rear end of 3 can be moved in the vertical direction, and the pivot pin 39 as the pivotal support of the first link 35 and the second link 37 can be slid along the elongated hole 44 of the bracket 42.

Further, as shown in FIGS. 4 (a) and 4 (b), in the range where the pivot pin 39 is slidable along the elongated hole 44 of the bracket 42, the locking rotary lever 46 is moved to the spring 54. The seat cushion 13 can be adjusted in the front-rear position by rotating the seat cushion 13 from the engagement state with the lock pin 51 by rotating the seat cushion 13 against the lock pin 51.

Then, when the turning force for the locking rotary lever 46 is released at the desired front-back position, the locking rotary lever 46 is returned clockwise by the spring 54, and the lock pin 51 is locked. Return to the state. At this time, since the lock groove is a taper groove, the lock pin 51 is guided in the taper groove, so that the lock pin is regulated to an accurate lock position.

The present invention is not limited to the structure of the above-described embodiment, but the shape, structure, etc. of each part may be modified as necessary.
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 adopted 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 of the present invention, the first link and the second link are rotatably supported, and the shaft support is slidably engaged with the elongated hole of the bracket of the seat cushion. A pivoting lever for locking is pivotally supported on the lower part of the front end side of the locking lever, a plurality of locking portions are formed on the pivoting lever for locking at appropriate intervals in the front-rear direction, A lock pin that is selectively locked to the locking portion of the lock lever, and an elastic member that urges the locking rotation lever in a direction in which the locking portion and the lock pin are engaged with each other. Therefore, when the seat back is tilted backward, the lower end of the arm bracket rotates forward,
The shaft support portions of the first link and the second link can be moved forward along the elongated holes of the bracket of the seat cushion, and the rear end of the seat cushion can be vertically moved by the rotation of the second link. It is possible to release the locking state between the locking portion and the lock pin by rotating the locking rotation lever against the elastic member, and in this state, lock the arbitrary locking portion and the lock pin. The seat cushion can be moved back and forth by facing the pin.

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-back direction is formed on the upper surface of the front end of the base frame, the front-back position adjusting mechanism is used. The seat cushion can be moved back and forth smoothly.

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 drawings]

FIG. 1 is a side view showing an embodiment of a reclining state of a vehicle seat according to the present invention.

FIG. 2 is a side view showing an example of a normal seated state of the vehicle seat according to the invention.

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 the vehicle seat according to the present invention showing a normal seated state, in which (a) is a side view of the seat cushion in a rear most state, and (b) is a side view of the seat cushion in a front most state. .

5A and 5B show a reclining state of a seat back of a vehicle seat according to the present invention, 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]

 10 Vehicle Seat 12 Base Frame 13 Seat Cushion 14 Seat Back 15 Vehicle Interior Floor 17 Bracket 18 Rotation Mechanism 20 Reclining Mechanism 20a Spindle 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 Long hole 46 Locking lever for locking 46a Grip 47a Bracket 47b Bracket 48 Locking part 49 Pivot pin 50 Tension spring 51 Lock pin 52 Bracket 53 Bracket 54 Coil spring

Claims (2)

[Claims] 1. A base frame supported on a pedestal,
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 bracket having an elongated hole extending in the front-rear direction is provided at the lower rear end of the seat cushion, one end of the first link is pivotally supported on the lower end side of the arm bracket, and one end of the second link is supported on the base frame side. Pivotally supports the other end of the first link,
Also, the other end of the second link is rotatably supported, the shaft supporting portion is slidably engaged along the elongated hole of the bracket, and a locking rotation lever is provided at a lower portion of the front end side of the seat cushion. A plurality of locking portions are formed on the lock rotation lever at appropriate intervals in the front-rear direction and are selectively locked to the plurality of lock portions of the lock rotation lever on the base frame. A vehicle seat, wherein a lock pin is provided, and an elastic member that biases the locking rotation lever in a direction in which the locking portion and the lock pin are engaged is provided. 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.