JPH0342884B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reclining device for a vehicle seat such as an automobile.

Since conventional reclining devices simply tilt the seat back in the front-back direction, the center of rotation and the hip point of the seated person, that is, the point corresponding to the center of rotation of the torso and trunk of the human body, are far apart. Therefore, each time the seat back is tilted, the sitting characteristics change, causing back and buttocks to shift, resulting in the inconvenience that the seated person has to sit up again. The reclining device that connects the cushion is equipped with a scalene four-bar link mechanism.
By tilting and rotating the seatback using this link mechanism, the center of rotation of the seatback and the hip point of the seated person are approximately aligned, and the posture of the seated person can be easily and smoothly changed by tilting and rotating the seatback. I have already disclosed something.

However, since such a reclining device uses a link piece and a sector to connect an arm fixed to the seat bag and a board fixed to the seat cushion to form a scalene four-bar link, the seat bag can be moved rearward in a substantially horizontal manner. There is an issue where it cannot be defeated.

SUMMARY OF THE INVENTION Therefore, the present invention aims to eliminate the above-mentioned problems of conventional products without changing the sitting characteristics such as back and buttocks.

The basic structure of the reclining device for a vehicle seat according to the present invention to achieve the above object is that an arm fixed to a seat bag is connected to a base plate of the seat cushion via a link, and the center of rotation of the arm is set in the vertical direction. so that it can be moved to
The seat back lowers as the seat back inclines rearward, thereby preventing changes in the seating characteristics of the seated occupant, such as compression of the lumbar vertebrae.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 and 1' are arms fixed to the frame of seat bag A, 2 and 2' are boards fixed to the front and rear sides of the frame b of seat cushion B, and 3 and 3' are arms of arms 1 and 1'. Free end and board 2,
The links 3, 3' and the arms 1, 1' are rotatably connected to each other by a connecting shaft 4. connects the left and right links 3, 3' and the arms 1, 1' with a single connecting shaft, but the invention is not limited to this as long as it connects each link 3 and arm 1. Of course. The connecting shaft 4 is inserted into the arc-shaped guide holes 21 and 21' formed at the rear of the substrate 2, and the guide holes 21 and
21' is provided on a circle centered on the base end pivot point of the links 3, 3', and the links 3, 3' having the connecting shaft 4 at the tip rotate around the pivot point. ing. In the figure, reference numerals 32 and 32' indicate pivot pins that rotatably connect the base ends of the links 3 and 3' to the base plates 2 and 2'. Further, a locking sector 31 is provided at the tip of one link 3, and this sector 3
1, a lock piece 41 provided on the arm 1, and an operating lever 42 of the lock piece 41 constitute a lock mechanism (FIG. 2).

A sector gear 11 is provided at the tip of the left and right arms 1, 1', and this sector gear 11 meshes with a gear 22 fixed to the base plate 2 to rotate the arms 1, 1'.
The seat frame b is arranged so that the concentrated load applied to the seat frame b is distributed over the seat frame b.

A lock piece 41 constituting the lock mechanisms 31, 41, 42 is slidably disposed on the arm 1 so as to mesh with the sector 31, and the operating lever 4
By the operation 2, the lock piece 41 engages with the sector 31 and becomes locked, holding the arm 1 at a constant angle. Further, by operating the operating lever 42 in the opposite direction, the lock piece 41 is separated from the sector 31, the locked state is released, and the arm 1 is tilted. The operating lever 42 has a tip rotatably attached to the connecting shaft 4, and has an arc-shaped elongated hole 4 in the center through which a pin 41a protruding from the locking piece 41 is inserted.
2a has a hole, and when the operating part 42b is gripped and rotated about the connecting part with the connecting shaft 4, the locking piece 41 engages with the sector 31 and separates. The locking piece 41 is always urged in the locking direction by a spring (not shown).

The operating state of this device will be explained based on FIGS. 3 to 6.

Fig. 3 shows a state in which seat bag A is stood up at a substantially right angle (relative to seat cushion B). hole 21,
It is located at the upper end of 21'. Next, control lever 4
2 to release the lock and tilt the seat back A, the arms 1 and 1' rotate from the center of rotation, and the center of rotation moves downward within the guide slots 21 and 21', so the seat back A tilts. (Fig. 4) Then, when the operating lever 42 is operated to further tilt the seat bag A, the rotation centers of the arms 1 and 1' are lowered along the guide slots 21 and 21'.
Seat back A becomes substantially coplanar with seat cushion B (FIG. 5). That is, as the seat back A tilts, the distance ( ). Therefore, the lumbar vertebrae of the seated person are not compressed by the tilting movement of the seat back A, and no back or buttocks shift occurs. When the lock is released using the operating lever 42, the sector gear 11 provided at the tip of the arms 1, 1' is meshed with the gear 22 fixed to the base plate 2, so
Even when a rear load is applied to the seat back A by the seated person, the seat back A does not fall back suddenly but gradually falls down.

As described above, the reclining device for a vehicle seat of the present invention includes an arm fixed to a seat bag, a substrate fixed to the seat cushion, a link rotatably connecting the arm and the substrate, and a link between the link and the arm. The base plate has a locking mechanism that locks the arm at an arbitrary tilted position, and the base plate has the base end of the link rotatably attached to the front part of the base plate, and a circle centered on the pivot point of the base end of the link at the rear part. An arc-shaped long guide hole is drilled, and a connecting shaft between the arm and the link is inserted into the long guide hole, so that the seat back can freely tilt around the connecting shaft that moves vertically within the long guide hole. From this point on, the seat back tilts while lowering. Therefore, since the seat back tilts without changing the seat characteristics of the occupant, the seat can be used comfortably because there is no back shift, buttock shift, or pressure on the lumbar vertebrae. In addition, since the sector gear of the arm is always meshed with the gear of the board, the concentrated load applied to the arm can be dispersed to the seat frame side via the board, and when the lock is released, the seatback does not tilt forward suddenly. Also, safety can be improved because there is no need to move backwards.

Moreover, since the arm of the seat bag tilts around the tip of the link as the center of rotation, the seat bag can be tilted so as to be substantially flush with the seat cushion (so that no step is created between the seat cushion and the seat bag).

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view, FIG. 2 is a front view showing the locking mechanism, and FIG.
5 to 5 are front views showing the operating state, and FIG. 6 is an explanatory diagram illustrating the movement of the seat back. In the figure, 1, 1' are arms, 2, 2' are substrates, 3,
3' is a link, 4 is a connecting shaft, and 31, 41, and 42 are lock mechanisms, respectively.

Claims (1)

[Claims] 1. An arm to be fixed to the seat bag, a board to be fixed to the seat cushion, a link to rotatably connect the arm and the board, and a lock mechanism provided across the link and the arm to lock the arm in any tilted position. The board has the base end of the link rotatably attached to the front part thereof, and has an arcuate guide hole centered at the link base end pivot point in the rear part, and the guide length is A vehicle seat characterized in that a connecting shaft between the arm and the link is inserted into the hole, a sector gear is provided at the tip of the arm, and a gear meshed with the sector gear is fixed to the base plate. Reclining device.