JPS6320354Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reclining device used for various types of seats.

As is well known, the reclining device is attached to a connecting portion between a seat cushion and a seat back, so that the tilting angle of the seat back can be arbitrarily adjusted according to the preference of the seated person. By the way, in addition to the angle adjustment mechanism, this reclining device has a movable arm that is rotatably supported on a fixed arm on the seat cushion side, and a spiral spring that is elastically mounted across the support shaft of the movable arm. The arm is biased with rotational force in the direction of tilting the seat back forward. The spiral spring can be attached to the support shaft by forming a slit at the end of the support shaft and engaging the inner end of the spiral spring with the slit.
Then, a screw hole is formed in the center of the shaft end where this slit is formed, and a protective cover is screwed to the spindle end through this screw hole to fix the protective cover and prevent the spiral spring from coming off. ing. However, the spring force of this spiral spring is set to be large in order to automatically tilt the seatback forward, so it is necessary to form a slit in the shaft as described above and lock the end of the spring to the slit. In this case, the tightening force of the spiral spring causes the shaft to flex and deform inward at the slit-forming portion, making it impossible to screw in or distorting the torsion of the protective cover fixing screw.

In view of the conventional situation, the present invention has a configuration in which a slit is formed at the end of the shaft and the end of the spiral spring is engaged with the slit, and a slit is fitted into the slit on the inner periphery of the end of the shaft. By fitting a washer having a pair of spacer pieces, it is possible not only to prevent the shaft end from being bent, but also to allow the protective cover fixing screw to be screwed in, while also preventing thread deformation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Fig. 1, 1 is a fixed arm fixed to the side of the seat cushion SC, and 2 is the fixed arm 1.
is rotatably supported by shaft 3, and the seat back S.
A movable arm fixed to the B side supports a sub-plate 4 that covers an angle adjustment mechanism 5, which will be described later, on the shaft 3.

The angle adjustment mechanism 5 includes an upper tooth 6 fixed to the movable arm 2, a fixed arm 1, and a sub-plate 4.
The lower tooth 7 is rotatably attached to the fixed arm 1 by a pin 8 and engages and disengages from the upper tooth 6, and the operating lever 9 is rotatably attached to the fixed arm 1 by a pin 10 and engages and disengages the lower tooth 7. It is configured.

The operating lever 9 is biased with a rotation force in the counterclockwise direction in FIG. There is.

A slit 12 is formed at the end of the shaft 3, and the inner peripheral end of a spiral spring 13 is engaged with the slit 12.
The outer peripheral end of the movable arm 2 is engaged with a pin 14 protruding from the movable arm 2, and the spring 13
A screw hole 15 is formed in the center of the end face of the shaft 3 as shown in FIG. 2, and a protective cover 16 is attached to the end of the shaft 3 by a screw.
The end of the shaft 3 is fitted with a washer 18 having a pair of spacer pieces 19 protruding from its inner periphery, which fit into the slits 12, to prevent inward and outward bending deformation due to the presence of the slits 12 at the end of the shaft 3.

Further, the outer edge of the molded base of the spiral spring mounting portion of the shaft 3 is caulked at three places, for example, to form protrusions 20 as shown in the third and fourth figures, and these protrusions 20 prevent the sub-plate 4 from coming out. The use of members such as retaining rings has been abolished.

According to the above embodiment structure, the operation lever 9 is pulled up in the direction of the arrow in FIG. 1 to disengage the lower teeth 7 from the upper teeth 6, and the seat back S.
The tilt angle of B can be adjusted as desired, or the seat back SB can be moved forward.

Here, a spiral spring 1 is attached to the end of the shaft 3.
Due to 3, excessive austerity is exerted,
Since the inner peripheral spacer piece 19 of the washer 18 fitted to the shaft end 3 fits into the slit 12, this spacer piece 12 sufficiently counters this tightening force.
This prevents the end of the shaft 3 from falling inward and deforming the thread of the screw 17.
Further, of course, even if an external force that causes the end portion of the shaft 3 to bend outward is applied, the washer 18 can reliably prevent the bending deformation due to this external force.

Note that the present invention is not limited to those equipped with the angle adjustment mechanism 5 disclosed in the above embodiments, but can be applied to any type of model.

As described above, according to the present invention, the pair of spacer pieces formed on the inner periphery of the washer fit into the slit at the end of the shaft, and the spacer pieces function as a compressive strength member on the open end side of the slit. Therefore, it is possible to reliably prevent the shaft end from being deflected inward due to the spiral spring tightening force, and the washer can also prevent the shaft end from being deflected outward, thereby further improving the reliability of the structure. Although it is simple, its practical effects are enormous.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is an exploded perspective view of the main parts, Fig. 3 is a side view of the sub-plate support, and Fig. 4 is a view taken in the direction of the arrow in Fig. 3. be. 1... Fixed arm, 2... Movable arm, 3...
Axis, 5... Angle adjustment mechanism, 12... Slit, 1
3... Spiral spring, 18... Washer, 1
9...Spacer piece.

Claims (1)

[Scope of utility model registration request] A movable arm fixed to the seat bag is rotatably supported on a fixed arm fixed to the seat cushion, and a slit is formed at the end of the shaft, one end of the spiral spring is engaged with the slit, and the other end is fixed to the fixed arm fixed to the seat cushion. In the structure in which the movable arm is biased in one direction by being attached to the movable arm side, the shaft end is fitted with a washer having a pair of spacer pieces that fit into the slit on the inner periphery. Features a reclining device.