JPS631052Y2 - - Google Patents

Description

[Detailed description of the invention] This invention utilizes the characteristics of coil springs to provide chair reclining devices, headrest devices, thigh support devices, lumbar support devices,
The present invention relates to a shaft locking device that can be used in a tilting angle adjusting member such as a side support device, or a folding mechanism of a tent, a clothesline, etc.

Conventionally, methods for tilting and locking members include those that engage gears, friction plates, and spring clutches, but there are ways to change the tilting angle of the member, for example, the tilting angle of the seat back in the case of a reclining seat. After the seat bag is unlocked by operating a lock release lever or the like, force is applied to the seat back, and the lock release lever is released at a desired angle to lock the seat back. Therefore, in order to change the tilting angle, it is necessary to perform two operations at the same time: releasing the lock and tilting the member, which is cumbersome to operate and is not suitable for devices such as lumbar supports where the member cannot be directly rotated. I couldn't use it.

This invention takes advantage of the fact that the diameter of the coil expands when a load is applied in the opposite direction to the winding direction of the coil spring, and by turning the operating shaft, the coil spring is unlocked and at the same time stepless angle adjustment is possible. The fixing member has a core bar integrally attached thereto, a straight part is rotatably inserted through the core bar, and the straight part has an L-shape. The rotating shaft has an inner diameter smaller than the outer diameter of both core metals and is fitted onto both core metals. is formed at the free end thereof, and a rotatable actuation shaft having an end portion attached to the end portion of the rotary shaft, a cup member accommodating the coil spring and both core metals, and the cup member A slit is formed in the rotary shaft, and the bent tip of the rotary shaft is positioned so as to individually engage with either end surface of the slit in the forward and reverse operating directions, and both ends of the coil spring are The free ends of the slit are positioned such that they can freely abut against the end face of the slit and the bent tip of the rotating shaft, and the end face of the slit comes into contact with the free end of the coil spring and the bent tip of the rotating shaft, causing the rotation. It is characterized by the ability to rotate and lock the shaft.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

In FIG. 1, reference numeral 1 denotes a box-shaped fixing member, which is fixed to a member 7 such as a seat cushion claim of a reclining seat with bolts 8, 8, etc. A core bar 2 is integrally attached to the inner wall of the fixing member 1.
A rotating shaft 6 inserted therein is inserted through the center hole of the core metal 2 and is rotatable about the fixing member 1. A core metal 3 having the same outer diameter as the core metal 2 of the fixing member 1 is integrally attached to the end of the rotating shaft 6 and is adjacent to the core metal 2. A coil spring 4, whose both ends are free ends without being hooked to any member, is fitted over the core metal 3 and the core metal 2. This coil spring 4 has both core metals 3
and 2 to lock the rotation of the core metal 3 and rotating shaft 6. Therefore, the coil diameter is slightly larger than the outer diameter of both core metals 3 and 2.
It is wound to have a small diameter. Further, both end portions formed at the free end are made to stand up to some extent to form hook portions 4a, 4b, which function to expand the coil spring 4 as will be described later.

These coil springs 4, both core metals 2 and 3,
The end of the rotating shaft is accommodated in a cylindrical cup member 9 attached to the tip of the operating shaft 5, so that it is subjected to the action of the operating shaft 5. in this case,
The actuating shaft 5 extends in the opposite direction to the rotating shaft 6 and is rotated by an external force, and this rotation causes the cup member 9 to rotate integrally with the operating shaft 5. . A horizontally elongated slit 10 is opened in the cup member 9 in the axial direction, and the bent tip 6c of the rotating shaft 6 is connected to both end surfaces 10d and 10e of the slit 10 and to one end surface in one operating direction. and the other end face in the other direction of operation, respectively. Further, the hook portion 4a at one end of the coil spring 4 is positioned so as to be able to freely come into contact with both end surfaces of the slit 10, and the hook portion 4b at the other end portion is positioned so as to be able to come into contact with the tip end 6c of the rotating shaft 6. It is located.

Next, the operation of this embodiment configured as described above will be explained.

In FIG. 3, when the operating shaft 5 is rotated in the direction of arrow A, the cup member 9 is also rotated in the same direction, and one end surface 10d of the slit 10 comes into contact with the hook portion 4a of the coil spring 4. Press in the same direction. As a result, the coil diameter of the coil spring 4 is expanded, and the lock that clamps the core metals 2 and 3 is released. Therefore, when the operating shaft 5 is further rotated in the direction of arrow A, the end surface 10d of the slit 10 comes into contact with the bent end 6c of the rotating shaft 6, and in order to press this, the rotating shaft 6 is rotated in the same direction (second direction). In the figure, it is rotated in the direction of arrow 2). On the other hand, the rotating shaft 5 is
When rotated in the direction of arrow B in the figure, the cup member 9
The other end surface 10e of the slit 10 first contacts the bent end 6c of the rotating shaft 6, and then the coil spring 4
Since the other hook 4b contacts and rotates in the same direction, the coil diameter of the coil spring 4 is expanded and the lock is released. As a result, the rotating shaft 6 is rotated in the same direction (in the direction of arrow C in FIG. 2).

Next, when the rotating shaft 6 is rotated in the direction of arrow C in FIG. As a result, the actuating shaft 5 is rotated in the same direction (the direction of the arrow B in FIG. 3), but when the rotating shaft 6 is rotated in the direction of the arrow D in FIG. Metals 2 and 3 are pressed together and locked. During this locking, both end surfaces 10d and 10e of the slit 10, the hook 4a of the coil spring 4, and the end 6 of the rotating shaft 6
An appropriate gap is formed between the lock and the lock, so that the lock can be stably maintained.

Therefore, by connecting the rotating shaft 6 to, for example, the rotating shaft of the seat back of a reclining seat, the seat back is tilted and raised in unison with the rotation of the operating shaft, and is locked in that position.

Therefore, according to the present embodiment described above, by rotating the operating shaft from side to side, the rotating shaft can be rotated to a desired position or locked at that position. By turning the angle adjusting member, it is possible to adjust the angle of the angle adjusting member without operating the member, and it is also possible to lock the member. Since this operation is a single operation, operability is improved. This can be used in particular for mechanisms in which the angle adjustment member cannot be manipulated and has practical value. Further, since the angle can be adjusted steplessly, it is possible to optimally adjust the angle according to the user's preference.

In the above embodiment, the tip of the rotating shaft is bent and engaged with the end surface of the slit, but a steel rod or the like may be fixed to the tip and this steel rod may be engaged with the end surface of the slit. Further, the slits of the cup member may be arranged in multiple rows. Furthermore, the shapes of the fixed member, rotating shaft, cup member, etc. can be changed as appropriate, and the same effects as in the above embodiment can be obtained in these cases as well.

As described in detail above, according to the present invention, it is possible to provide a shaft locking device that can adjust the angle and lock a member with a single operation.

[Brief explanation of drawings]

The drawings all show one embodiment of the present invention; FIG. 1 is a cutaway front view, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a right side view, and FIG. FIG. 1 is a sectional view taken along the - line in FIG. 1; 1... Fixed member, 2... Core metal, 3... Core metal, 4
... Coil spring, 5 ... Operating shaft, 6 ... Rotating shaft,
9...Cup member, 10...Slit.

Claims (1)

[Scope of utility model registration request] A fixing member to which a cored metal is integrally attached, a straight portion rotatably inserted through the cored metal,
A rotary shaft having another cored metal integrally attached to the L-shaped bent end of the straight part, and a rotating shaft having an inner diameter smaller than the outer diameter of both cored metals, a coiled spring that is inserted outwardly and has both ends formed as free ends; a rotatable operating shaft that has a cup member attached to the end that accommodates the end of the rotating shaft, the coil spring, and both cored metals; a slit is formed in the cup member, and the bent tip of the rotary shaft is positioned so as to individually engage with one of both end surfaces of the slit in the forward and reverse operating directions; and the free ends of both ends of the coil spring are positioned so as to be able to come into contact with the end surface of the slit and the bent tip of the rotating shaft, respectively, and the end surface of the slit is placed in contact with the free end of the coil spring and the bent tip of the rotating shaft. A shaft locking device characterized in that the shaft is rotated and locked by contacting the shaft.