JPH0456609B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat for a vehicle or the like equipped with a reclining device.

2. Description of the Related Art Conventionally, there has been a seat in a vehicle equipped with a reclining device as shown in FIG.

In this seat 1, the stationary seat cushion 2
On the other hand, the seat bag 3 is configured so that it can be folded backward from the position shown by the solid line to the position shown by the dashed line. Therefore, when the seated person A tilts the seat back 3 backward from the normal sitting posture to take a backward leaning posture, the buttocks of the seated person A tend to shift forward as a result. In other words, seated person A
The hip point 4a, which is a guideline for the center of gravity of the buttocks in the state shown by the solid line (normal sitting state), shifts to the position of the front hip point 4b when shifting to the reclining state shown by the one-dot chain line.

In this way, if the buttocks shift forward, the seat becomes uncomfortable and the seated person A has to sit back down each time to correct the sitting posture, which is an inconvenience.

In view of the above-mentioned points, the present invention uses a reclining device to prevent the hip point of the seated person from moving back and forth when the seatback of the seat is collapsed and the seated person attempts to take a backward leaning posture, thereby preventing the seated person from sitting up again. The purpose is to enable users to maintain a comfortable sitting posture while sitting in the same position.

Therefore, in the vehicle seat of the present invention, a movable frame is pivotally connected to the cushion frame at its front portion so as to be rotatable in the vertical direction, and the rear portion of the movable frame and the hinge rear portion of the back frame are connected by a link member. The movable frame is configured to rotate downward about its front pivot joint in conjunction with the rearward tilting of the back frame, and the seat reclining device allows the seat back to be tilted. When the seated person tries to take a backward leaning posture, the seat surface of the seat cushion under the ischial bones is lowered to prevent the seated person's hip point from moving forward or backward, causing the so-called buttocks to shift forward. This is to prevent

Hereinafter, a second embodiment of the seat for a vehicle, etc. of the present invention will be described.
This will be explained with reference to FIGS. 5 to 5. Note that parts corresponding to those in FIG. 1 are given the same reference numerals for convenience of explanation.

FIG. 2 is an overall schematic diagram of the seat of this example. In the seat 1 of this example, the seat cushion 2 moves in conjunction with the tilting of the seat back 3 during the reclining operation shown by the dashed line from the normal seating state shown by the solid line. The surface is made to descend.

FIGS. 3 and 4 show the main parts of the structure for this purpose, in which 5 is a cushion frame of the seat cushion, and 6 is a back frame of the seat back. A lower end bearing portion 7 of one side portion 6a of the back frame 6 corresponding to the hinge portion 10 formed at the rear end of one side portion 5a of the cushion frame 5 is pivoted by a shaft pin 8. be. A recliner mechanism 9 is attached to the rear end of the other side 5b of the cushion frame 5 and the corresponding lower end of the other side 6b of the back frame 6. Therefore, the back frame 6 is configured to be tiltable at a predetermined angle and fixed.

Further, both side surfaces 5a of the cushion frame 5,
Hinge brackets 11, 11 each having a shaft hole 12 are fixed to the inner side of the front end of the cushion frame 5 by means such as welding. On the other hand, the front part of the spring mounting member 13 serving as a movable frame is pivoted. That is, this spring mounting member 13 is formed of an angle material, and has a shaft hole 14 bored in its front end.
A shaft pin 15 is inserted through this shaft hole 14 and the shaft hole 12 of the hinge bracket to be pivotally attached.

Furthermore, this pair of spring mounting members 13
A support pipe 16 is passed between the rear ends, and each end of the support pipe 16 is fixed to the rear end of each spring mounting member 13 by means such as welding.

Additionally, clamp members 26 each having a U-shaped cross section are fixed to three predetermined locations on the upper flat plate portions of the pair of spring mounting members 13 in correspondence with each other.
The other end of each S spring 27, which has one end fixed to 6, is fixed to each corresponding clamp member 26 of the other spring mounting member 13, and the three S springs 27 are stretched. A support pipe 16 between the rear parts of this member 13 and a center pipe 17 provided between both sides 6a and 6b of the back frame 6
A link member is installed between the

Each end of the center pipe 17 is fixed to both sides 6a, 6b of the back frame 6, respectively. Also, near both ends of the center pipe 17, brackets 18, which are oblong flat plates as part of the link members, are inserted through holes near one end of the brackets 18, and the free end side thereof is positioned rearward from the hinge portion of the back frame 6. It is fixed by means such as welding so that it is in the correct position. Furthermore, a shaft hole 19 is bored in the free end of each bracket 18.

Then, a shaft pin 22 is passed through a shaft hole 21 bored in one end of a long plate-shaped link plate 20 forming a part of the link member, and into a shaft hole 19 of each bracket. Further, a support pipe 16 is passed through the shaft hole drilled at the other end of each link plate 20. Washers 23 are aligned with both sides of the link plate 20, and the support pipes 16 are placed at positions on both sides of the link plate 20. Spring pins 25, 25 are fitted into the perforations 24, 24, and each link plate 20 is pivotally attached to the support pipe 16 at a predetermined position so as to be rotatable without moving laterally.

In this configuration, the bracket 18 and the link plate 2
0 is an extension of the line connecting the hinge of the back frame 6 and the pivot of the link plate 20 to the spring attachment member 13, and a vertical line b from the hinge of the back frame 6 (see Fig. 5). ).

In addition, depending on design or assembly circumstances,
The center pipe 17 may be directly passed through the shaft hole 21 of each link plate 20 pivotally mounted to the support pipe 16 without using the bracket 18, and the link plate 20 may be rotatably mounted. In this case, the fixing position of the center pipe 17 with respect to the back frame 6 is set to the rear from the above-mentioned extension line a and vertical line b.

Next, the operation of the vehicle seat of this example constructed as described above will be explained with reference to FIGS. 2 and 5.

First, in the normal sitting state of the seated person, which is shown by the solid line in FIG. It is supported substantially on the same plane as the cushion frame 5 via the bracket 18, the link plate 20, and the support pipe 16.
In this state, the seat cushion 2 has a substantially horizontal seating surface over its entire surface.

This is because the shaft attachment portion between the bracket 18 and the link plate 20 is the most distant from the cushion frame 5.

From this state, when the lever 9a of the recliner mechanism 9 is operated to tilt the back frame 6 to the reclined state as shown by the dashed line in FIG. 5, the center pipe 17 fixed to the back frame 6 is moved downward. Along with the displacement, the bracket 18 is also displaced integrally with the center pipe 17, and the free end side thereof, that is, the link plate 20
Since the shaft attachment part of the hinge bracket 11 faces toward the support pipe 16, the support pipe 16 is pushed down via the link plate 20, and the spring mounting member 13 is centered around the shaft pin 15 of the hinge bracket 11. The seat cushion 2 is rotated downward, so that the seat surface of the seat cushion 2 moves to a state where the rear part thereof is tilted low.

That is, as shown in FIG. 2, the seat back 3 of the seated person A moves to the reclining state shown by the dashed line, but at this time, the seat cushion 2
The seat surface of the seat is tilted backwards and the seat surface under the ischial bone is lowered, so the hip point 4a in the normal sitting posture
Hip point 4b when reclining from
The hip point will descend in an almost vertical direction until Therefore, the hip point of the seated person A does not move in the front-back direction, so that the so-called phenomenon of the buttocks shifting forward can be avoided.

Furthermore, when returning the seat back 3 from the reclining state to the normal upright state, the movement is the opposite to that described above, so the hip point of the seated person A does not move in the front-rear direction, but the comfort of the seat changes. can be maintained in good condition.

In this example, the movable frame that is pivoted to the cushion frame is constructed by suspending the spring from the spring mounting member, but it is also possible to form the cushion frame into a bread shape from a resin material and attach the pad receiving spring. In the case where it is not used, a movable frame formed in the shape of a substantially flat plate is used. In this case, the front part of the plate-like frame is pivoted to both side walls of the bread-shaped cushion frame, and the above-mentioned structure can be applied to connect the rear part to the back frame.

As described above, according to the vehicle seat of the present invention, the reclining device lowers the seating surface of the seat cushion rearward in conjunction with the tilting of the seat back when changing from the normal sitting posture to the rearward leaning posture. Since the seat is tilted, that is, the seat surface below the seat bones is lowered, it is possible to prevent the so-called buttocks from shifting forward and improve the comfort of the seat.

In addition, since the movable frame is placed on the inside of the cushion frame, when attaching exterior materials such as sheet members to the cushion frame, it is necessary to secure space outside the cushion frame for the movement range of the movable frame. The appearance of the seat cushion is improved.

In addition, the interlocking mechanism between the cushion frame and the back frame is constructed by connecting a pair of movable frames that support the seat cushion and the back frame via a link member, so the mechanism is simple and can be manufactured at low cost. There are also effects.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an example of a seat of a conventional vehicle, etc., FIG. 2 is a schematic side view showing an example of a seat of a vehicle, etc. of the present invention, and FIG. 3 shows the main parts of the seat of FIG. 2. FIG. 4 is a partially exploded perspective view of the seat, and FIG. 5 is a side view for explaining the operation of essential parts of the seat shown in FIG. 2. In the diagram, 1 is the seat, 5 is the cushion frame, and 6
1 is a back frame, 13 is a spring mounting member as a movable frame, 18 is a bracket as a link member, and 20 is a link plate as a link member.

Claims (1)

[Scope of Claims] 1. In a vehicle seat, etc., in which a seat back is connected to a seat cushion in a tilt-adjustable manner, a movable frame on which a cushion member is mounted is disposed inside the cushion frame, and the movable frame is The front part of the movable frame is pivotally connected to the cushion frame so as to be able to rotate in the vertical direction, and the rear part of the movable frame and the rear hinge part of the back frame are connected via a link member, and the back frame is connected to the back frame. The movable frame is rotated downward relative to the cushion frame about the front pivot joint in conjunction with the tilting of the cushion frame,
A seat for a vehicle, etc., characterized in that the rear seat surface of the seat cushion is configured to be lowered.