JPS63240804A - Seat reclining apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a seat reclining device that can be folded forward so as to be easily carried into a vehicle through a door opening of a vehicle.

Conventional seat reclining devices generally include a seat cushion bracket that is fixed to a lower arm that supports a seat cushion and has external teeth (or internal teeth), a seat cushion bracket that is fixed to an upper arm that supports a seat bank and has internal teeth (or a seatback bracket having a seat back bracket (external teeth), a regular shaft portion that pivotally supports the internal teeth, and an eccentric shaft portion that pivotally supports the external teeth in a manner in which the external teeth are engaged with the internal teeth, and is connected to the drive unit. By rotating the shaft, a planetary gear mechanism with internal and external gears is used to tilt the seat back toward the front shoulder relative to the seat cushion.
(See Publication No. 753).

A seat reclining device with such a structure is
By rotating the shaft, the seat bank can be tilted to any position within a certain normal rotation angle range.

Problems to be Solved by the Invention The seat back rotation angle of conventional seat reclining devices is such that the forward inclination angle from the neutral position is small and the backward inclination angle is large. 1
(possible).

On the other hand, in order to install the seat into a car, the seat cushion and seat back are assembled together and then carried into the car through the door opening of the car. To explain this state with reference to FIG. 4, the seat assembly 1 having the conventional seat reclining device takes the shape shown by the imaginary line even if it is folded forward. Therefore, the seat assembly 1 is inserted into the vehicle from the door opening 2.
When transporting the car, there is a high risk that part of the seat back will hit the rear edge of the door opening 2, so the seat assembly is moved diagonally into the car, but this process is surprisingly troublesome. It makes work efficiency worse.

Therefore, it is an object of the present invention to solve the above-mentioned problems of the prior art.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a seat assembly 1' shown by a solid line in FIG. 4 when being carried into a car,
After being carried into the vehicle, the seat back can be moved to the commonly used forward position shown by the imaginary line. More specifically, a stopper bracket is fixed to the lower arm, and a cam plate having a stepped portion is fixed to the seat back side, and when the seat back is tilted forward to the maximum (solid line state in Fig. 4), the stepped portion of the cam plate is fixed to the lower arm. A technical means is used to lock the pole to the stopper bracket and lock the flange of the pole to the stepped portion when the seat bank is normally tilted forward at 7 o'clock (the imaginary line state in FIG. 4).

When the stepped part of the cam plate and the stopper bracket are engaged when the cam plate is tilted forward at its maximum, the pawl is kept in contact with the cam surface of the cam plate and is kept in standby.When the seatback is tilted back, the pawl separates from the cam surface. The pawl subjected to the biasing force of the spring then comes into contact with the stopper bracket, and after that, when the seat bank is tilted forward, the stepped portion of the cam plate comes into contact with the flange of the pawl, and the usual forward-folding position of the seat back is obtained. . In this way, the seat assembly is carried into the car in the maximum forward position, and then the seat back is moved backward to lock the pole to the stopper bracket, and then the seat back is moved forward to lock the pole's flange. The stepped portion of the cam plate is brought into contact with the seat to bring it into the normal forward tilted state, and thereafter the seat back can be reclined in the normal manner. In addition, from the commonly used forward position,
Furthermore, the seat back cannot be moved forward.

Example Refer to FIGS. 1-3. A seat cushion bracket 6 having external teeth 5 with π is fixed to a lower arm 4 supporting a seat cushion 3. A seat back bracket 1 having internal teeth 9 on an upper arm 8 that supports a seat back 7.
Fix 0. The internal teeth 9 have at least one more tooth than the external teeth 5.

The internal teeth 5 are supported by the positive 6-axis portion of the shaft 11, and the external 1yI
9 is pivotally supported on the eccentric shaft portion of the shirt II. (then,
One revolution of the shaft 11 is equal to the difference in the number of internal and external teeth of 5.9,
The seat back bracket 10 is tilted relative to the seat cushion bracket 6. The shaft 11 is preferably rotated by an electric motor.

Fix the stone bar bracket 1-12 to the lower arm 4. A long hole 13 is bored on the front edge side of the stopper bracket 12, and a step is provided on the edges 9, b facing ThJ, so that the edge is lower than the edge a. part 14 of the stopper bracket 12.
A step is formed by press working along the line connecting 14'.

One end of the pole 15 is pivotally supported on the lower arm 4, and a flange 16 is provided at the tip. Also, connect the pole 15 to the spring 1.
Press 7 to energize in one direction.

A cam plate 18 is fixed to the seat back bracket 10, and this cam plate 18 is attached to a pair of steps 19.1.
9', and a cam surface 20.20' consisting of a part of an arcuate surface.
has.

At the maximum forward tilt shown in FIG. 1, the stepped portion 19 of the cam plate 18 comes into contact with the lower edge of the elongated hole 13, making further forward tilting of the seat back 7 impossible. At this time, the edge of the pawl 15 comes into contact with the cam surface 20 of the cam plate 18, and the movement of the pawl 15 by the spring 17 is restricted.

After being carried into the vehicle, when the shaft 11 is rotated and the seat back 7 is pushed backwards, the stepped portion 19 of the cam plate 18 separates from the lower edge of the elongated hole 13, causing the pole 15 to turn upward as seen in FIG. Push clockwise. When the contact between the pawl 15 and the cam surface 20 is released, the pawl 15 receives the urging force of the spring 17 and rotates clockwise, and the flange 16 engages with the side edge of the stopper bracket 12 (the third (See figure) Side edge of stomper bracket 12 and flange 1 of pole 15
6 restricts the clockwise movement of the pawl 15, and then reversely rotates the shaft 11 to rotate the seat back 7.
When the seat back 7 is tilted forward, the stepped portion 19 of the cam plate 18 comes into contact with the flange 16 of the pole I5, thereby specifying the commonly used forward tilting position of the seat back 7. Reclining from this commonly used forward position to the rear can be performed by rotating the shaft as before.

As is clear from the above, since the seat assembly can be carried into the vehicle with the seat back in the maximum forward position shown in FIG. 1, the carrying work is extremely easy. After that, the shaft 11 is rotated to tilt the seatback backwards, returning it to the neutral position, and securing the usual forward-folding position (see Figure 3) with a pole, so the seat can be moved as before (or reclined as desired). can be done.

Note that the maximum rearward position is determined by the step portion 19' coming into contact with the rear edge of the stopper bracket 12.

Effects According to the present invention, once the maximum forward-folding state is released, the pole will not tilt the seat back forward beyond the normal forward-folding position. Therefore, the front seat can be used in the same way as a conventional seat without unexpectedly returning to the maximum forward position.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of the present invention in the maximum forward-loaded state;
FIG. 2 is an exploded perspective view thereof, FIG. 3 is a front view showing an example of the present invention in a normal forward-folding state, and FIG. 4 is a front view showing a seat being carried in. In the diagram: 3- seat cushion, 4- lower arm, 5
．． 9-teeth, 6-・seat cushion bracket, 7
- seat back, 8 - upper arm, 10 - seat bank bracket, 11 - shaft, 12...
・Stopper bracket, 15-pole, 17-
・-Spring, 18-・Cam plate, 19 Single step part.

Claims (1)

[Claims] A seat cushion bracket that is fixed to a lower arm that supports a seat cushion and has external teeth (or internal teeth); a seat back bracket that is fixed to an upper arm that supports a seat back and has internal teeth (or external teeth); a shaft that has a regular shaft that is pivotally supported and an eccentric shaft that pivotally supports the external teeth in a manner that the external teeth are engaged with the internal teeth, and that is connected to a drive section, and is fixed to the lower arm; Stopper bracket, seat back bracket (
a cam plate fixed to the lower arm (or upper arm) and having a stepped portion; a pole having one end pivotally supported by the lower arm and having a flange at its tip; and a spring biasing the pole in one direction; The seat reclining device is characterized in that the stepped portion is engaged with the stopper bracket when the seatback is tilted forward to the maximum, and the flange is engaged with the stepped portion when the seatback is normally folded forward.