JPH0535735Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a reclining device for a vehicle seat installed in a vehicle such as an automobile.

<Prior Art> Conventionally, a vehicle seat has been provided in which an arm attached to a back frame of a backrest is rotatably attached to a base plate attached to a cushion frame of the seat, so that the backrest can be tilted and adjusted steplessly. For example, the reclining device is
It is publicly known from Publication No. 54810 and the like.

<Problem to be solved by the invention> In such a conventional reclining device,
As shown in FIG. 6, meshing teeth 3 are formed on the inner peripheral surface of a circular hole 2 of an arm 1 which is attached to a back frame of the backrest (not shown), and the backrest is locked in a predetermined tilted position by a gear lock formed by the meshing of the meshing teeth 3 with a gear 4 which is eccentrically disposed within the circular hole 2, or by frictional force, so that the structure of the locking portion is complicated.

In addition, with this type of stepless adjustment type, the amount of tilting of the backrest per one rotation of the adjustment operation dial is very small, so if you want to tilt the backrest a large amount, you need to turn the adjustment operation dial many times. must be operated. Therefore, there was a problem in that the backrest could not be tilted rapidly and greatly, resulting in poor operability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reclining device for a vehicle seat in which the lock part has a simple structure and the backrest can be adjusted steplessly.

<Means for Solving the Problems> In order to achieve the above object, the present invention has an arm attached to the back frame of the backrest rotatably attached to a base plate attached to the cushion frame of the seat, so that the backrest can be tilted. In the reclining device for a vehicle seat, a boss portion concentric with the center of rotation of the back frame is provided protruding from the surface of the base plate, a screw hole is drilled in the center of the boss portion, and a screw hole is drilled in the center of the boss portion. The surface of the part is provided with an uneven surface that continues alternately in the circumferential direction, the arm is provided with a fitting hole that rotatably fits on the outer periphery of the boss part, and the fitting hole is formed in the surface of the arm. Attach a leaf spring disc so as to close the disc, drill a screw rod insertion hole in the center of the leaf spring disc, and match the uneven surface of the boss portion to the back side of the rotating body with the screw rod protruding from the center of the back side. The fitting hole of the arm is fitted into the boss portion of the base plate, and the screw rod of the rotating body is screwed into the screw hole of the boss portion through the screw rod insertion hole of the leaf spring board. It is characterized by the combination of

<<Operation>> When the rotating body is rotated in one direction, the uneven surface of the rotating body engages with the uneven surface of the boss portion via the leaf spring disc, thereby locking the backrest at the tilted position.

Moreover, when the rotating body is rotated in the other direction, the engagement between the uneven surface of the rotating body and the uneven surface of the boss portion is released, making it possible to tilt the backrest in the front-rear direction.

<<Example>> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5. FIG. 1 is a perspective view of a vehicle seat equipped with a reclining device according to the present invention. In the figure, reference numeral 10 is a seat, and a base plate 11 is attached to a bolt 12 on one side of the rear end of a cushion frame (not shown). Fixed by Reference numeral 13 denotes a backrest, and the upper end side of the arm 14 is fixed to one side of the lower end side of the back frame (not shown) with a bolt 15 from the approximate middle part of the arm 14. Then, by rotatably fitting a fitting hole 17 formed on the lower end side of the arm 14 from approximately the middle part to a circular boss portion 16 protrudingly provided on the surface of the base plate 11 by press molding. , the backrest 13 is designed to tilt. As shown in FIG. 2, a screw hole 18 is bored in the center of the boss portion 16. Further, on the surface of the boss portion 16, a corrugated surface 19 that alternately continues in the circumferential direction is formed by press molding. A leaf spring disc 20 is attached to the surface of the arm 14 so as to close the fitting hole 17, and this leaf spring disc 20
A threaded rod insertion hole 21 is bored in the center.
On the outside of the arm 14, a screw rod 23 is provided protruding from the center of the back surface of the rotating body 22, which faces the leaf spring rod 20. Further, a boss portion 1 is provided on the back surface of the rotating body 22.
An uneven surface 24 corresponding to the uneven surface 19 of No. 6 is formed by press molding. And Figure 4,
As shown in FIG. 5, the screw rod 23 passes through the screw rod insertion hole 21 of the leaf spring disk 20 and is screwed into the screw hole 18 of the boss portion 16. A protruding wall 25 that protrudes in the radial direction is integrally provided on the outer peripheral edge of the rotating body 22 . The engaging surface 25a of this protruding wall 25 has a first
As shown in the drawings and FIG. 3, a cam body 26a at the base end of the operating lever 26 is slidably engaged. The operating lever 26 has its base end rotatably attached to the outer surface of the base plate 11 via a shaft 27. The operating lever 26 is operated by a return spring 28
is biased counterclockwise in FIG. When the operating lever 26 is returned to the initial position by the urging force of the return spring 28, the rotating body 2
2 is held in a rotated position in one direction (clockwise in FIG. 3), and the uneven surface 24 of this rotating body 22
is applied to the uneven surface 19 of the boss portion 16 via the leaf spring disk 20.
engage with. Moreover, the operation lever 26 returns to the spring 2.
When the rotating body 22 rotates clockwise in FIG. 3 against the biasing force of 8, the rotating body 22 rotates in the other direction (counterclockwise in FIG. 3) due to the biasing force of a spring (not shown). The uneven surface 24 of 22 and the uneven surface 19 of the boss portion 16
The engagement with is released.

Next, the operation of the vehicle seat reclining device configured as described above will be explained. First, control lever 2
6 is not operated (the state shown in FIG. 3), the uneven surface 24 of the rotating body 22 is engaged with the uneven surface 19 of the boss portion 16 via the leaf spring disk 20 as shown in FIG. As a result, the backrest 13 is held locked in this tilted position.

In this locked state, when the operating lever 26 is rotated clockwise in FIG. 3 against the biasing force of the return spring 28, the rotating body 2 is rotated by the cam body 26a.
Since the rotating force for 2 is lost, this rotating body 2
2 is a screw rod 23 that rotates counterclockwise in FIG.
The rotating body 22 moves to the right in FIG. 4 due to the screw feeding action. As a result, as shown in FIG.
It can be tilted forward and backward around the center.

After adjusting the tilt of the backrest 13 to a desired angle in this manner, when you release your hand from the operating lever 26, the operating lever 26 returns to rotation in the counterclockwise direction in FIG. 3 due to the biasing force of the return spring 28. Accordingly, the rotating body 22 is rotated clockwise in FIG. 3 by the cam body 26a, and the screw rod 2 rotates together with the rotating body 22.
3, the rotating body 22 moves to the left in FIG. As a result, as shown in FIG. 4, the uneven surface 24 of the rotating body 22 engages with the uneven surface 19 of the boss portion 16 via the leaf spring disc 20, and the backrest 13 is again locked in the tilted position. In this way, the backrest 13 can be tilted and adjusted steplessly.

<<Effect of the invention>> As described above, the present invention provides a vehicle seat in which the arm attached to the back frame of the backrest is rotatably attached to the base plate attached to the cushion frame of the seat, so that the backrest can be tilted. In the reclining device, a boss portion concentric with the center of rotation of the back frame is provided on the surface of the base plate, a screw hole is bored in the center of the boss portion, and a screw hole is provided in the center of the boss portion in the circumferential direction. a plate spring board is provided on the surface of the arm so as to close the fitting hole, and the arm is provided with a fitting hole that is rotatably fitted to the outer periphery of the boss portion. is mounted, a threaded rod insertion hole is bored in the center of the leaf spring board, and an uneven surface corresponding to and matching the uneven surface of the boss portion is provided on the back side of the rotating body with the screw rod protruding from the center of the back surface, The fitting hole of the arm is fitted into the boss portion of the base plate, and the screw rod of the rotating body is screwed into the screw hole of the boss portion through the screw rod insertion hole of the leaf spring disk. It is something to do.

Therefore, since the lock part is only a leaf spring disc,
With a simple configuration, the backrest can be adjusted steplessly. Furthermore, if the engagement between the boss portion and the uneven surfaces of the rotating body is released, the backrest can be tilted rapidly and greatly, improving operability. Furthermore, with the simplification of the structure of the lock section, cost and space savings can be achieved.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
FIG. 1 is a perspective view of a vehicle seat equipped with the reclining device of the present invention, FIG. 2 is an exploded perspective view of the reclining device of the present invention, and FIG. 3 is a front view of the rotating body and operating lever portion of the device. FIG. 4 is a sectional view of the same device in the locked state, FIG. 5 is a sectional view of the same device in the unlocked state, and FIG. 6 is a perspective view of the locking portion of the conventional reclining device. 10...seat, 11...base plate, 13
... Backrest, 14 ... Arm, 16 ... Boss part, 17 ... Fitting hole, 18 ... Screw hole, 19 ...
Irregular surface of boss portion, 20... Leaf spring board, 21... Screw rod insertion hole, 22... Rotating body, 23... Screw rod,
24...Uneven surface of rotating body.

Claims (1)

[Scope of utility model registration request] In a vehicle seat reclining device in which an arm attached to a back frame of a backrest is rotatably attached to a base plate attached to a cushion frame of a seat, so that the backrest can be tilted, a boss portion concentric with the rotation center of the back frame is protruded from the surface of the base plate, a screw hole is drilled in the center of the boss portion, and a continuous uneven surface is provided on the surface of the boss portion, which is alternately continuous in the circumferential direction, and the arm is rotatably attached to the outer periphery of the boss portion. a fitting hole that fits into a boss portion of the base plate, a leaf spring plate is attached to the surface of the arm so as to close the fitting hole, a threaded rod insertion hole is drilled at the center of the leaf spring plate, a recessed and protruding surface that matches the recessed and protruding surface of the boss portion is provided on the back surface of a rotating body having a threaded rod protruding from the center of the back surface, the fitting hole of the arm is fitted into the boss portion of the base plate, and the threaded rod of the rotating body is screwed into the threaded hole of the boss portion through the threaded rod insertion hole of the leaf spring plate.