JPS6317861Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking device for a rotating device in which two brackets each fixed to a mating part are rotatably connected via a rotating shaft.

This type of locking device is used for the reclining of various chairs and the angle adjustment mechanism of headrests, footrests, etc. Conventionally, the shaft locking device is a spring clutch type in which the rotating shaft itself is tightened by the coil part of the shaft locking spring. It was hot.

However, this shaft locking device cannot obtain a locking force greater than the strength of the material of the shaft locking spring, so in order to obtain a greater locking force, the diameter of the material of the shaft locking spring must be increased. Therefore, in order to obtain a larger locking force, related parts such as the rotating shaft must also be made larger, which increases the size of the entire device, which limits the mounting area and also poses an economical problem. .

The present invention was devised in view of the above-mentioned circumstances, and is a compact and economically advantageous rotating device in which the locking force of the shaft locking spring can be increased by changing the gear diameter ratio of the two meshing gears. The purpose of this invention is to provide a locking device for a vehicle.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

The figure shows a locking device 4 in a rotating device in which two brackets 1 and 2, each fixed to a mating part, are rotatably connected via a rotating shaft 3.

The locking device 4 includes a substantially fan-shaped first gear 5 having teeth 5a carved on the circumference around the rotating shaft 3 at the end of the bracket 1, and a core metal 6 implanted in the bracket 2. A second gear 7 is rotatably attached to the core metal 6 and meshed with the first gear 5, and a coil portion 8a having an inner diameter smaller than the outer diameter of the core metal 6 is expanded in diameter. one end 8b of both ends of the coil portion 8a is a free end, and the other end 8c is
and a shaft locking spring 8 pivotally supported by the second gear 7. And the diameter R of the first gear 5
and the diameter r of the second gear 7 is R/r>1.

In addition, 9 is a long hole drilled in the first gear 5, and 10 is a long hole bored in the first gear 5.
is a stopper pin that is implanted in the bracket 2 and passes through the elongated hole 9. The elongated hole 9 and the stopper pin 10 allow the bracket 1 to rotate at an angle α.
be restrained within 11 and 12 are E rings.

Next, the operation of the lock device 4 will be explained.

First, the case where a load is applied to the bracket 1 in the a direction will be described.

The load applied to the bracket 1 in the direction a acts to rotate the second gear 7 in the direction b via the first gear 5, and also acts on the shaft locking spring 8 via the other end 8c of the coil. This acts to tighten the portion 8a.

Therefore, when a load is applied to the bracket 1 in the a direction, the shaft locking spring 8 tightens the core bar 6 more strongly via the first gear 5 and the second gear 7, so the bracket 1 rotates in the a direction. Locked without movement. The locking force at this time is not only the clamping force (strength of the spring material) of the shaft locking spring 8 against the core metal 6, but also the force times the clamping force (first gear diameter R/second gear diameter r). . Therefore, by designing the first gear diameter/second gear diameter>1 or more, a locking force greater than the material strength of the shaft locking spring 8 can be obtained.

If an excessive load is applied to the bracket 1 in the direction a, a slippage will occur between the shaft locking spring 8 and the core metal 6, causing the second gear 7 to rotate in the direction b and the bracket 1 to move in the direction a. It is designed so that it can be rotated to avoid the above-mentioned overload.

Next, a case will be described in which a load is applied to the bracket 1 in the direction c, which is opposite to the direction a.

The load applied to the bracket 1 in the c direction acts to rotate the second gear 7 in the d direction via the first gear 5, and also acts on the shaft locking spring 8 to rotate the coil via the other end 8c. The portion 8a acts to expand in diameter.

Therefore, when a load is applied to the bracket 1 in the c direction, the load is applied to the first gear 5 and the second gear 7.
Since the diameter of the coil portion 8a of the shaft locking spring 8 is expanded through the bracket 1, the bracket 1 can be rotated in the direction c with a small force.

Since the locking device according to the present invention has the structure and operation described above, it has the following practical effects.

That is, according to the present invention, the locking force of the shaft locking spring can be increased by the ratio of the first gear diameter to the second gear diameter, so when it is desired to obtain a locking force greater than the locking force of the shaft locking spring. However, it is completely unnecessary to increase the diameter of the spring material or to increase the size of related parts such as a core metal, and it is possible to provide a locking device for a rotating device that is lightweight and compact as a whole.

[Brief explanation of the drawing]

1 and 2 show an embodiment of a locking device in a rotating device according to the present invention, FIG. 1 is a plan view thereof, and FIG. 2 is a side view thereof. 1, 2... Bracket, 3... Rotating shaft, 4...
Lock device, 5... First gear, 6... Core metal, 7
...Second gear, 8...Shaft lock spring, R...First gear diameter, r...Second gear diameter.

Claims (1)

[Scope of utility model registration request] In a rotating device in which two brackets, each fixed to a mating part, are rotatably connected via a rotating shaft, a first gear provided at the end of one bracket and a first gear installed at the end of the other bracket are connected. A second gear is rotatably attached to the provided core metal and meshed with the first gear, and the core metal has a coil portion having an enlarged diameter smaller than the outer diameter of the core metal. and a shaft locking spring which is externally inserted and has one end of the coil portion as a free end and the other end pivotally supported by the second gear, and the first gear diameter/second gear diameter. A locking device in a rotating device, characterized in that >1.