JPH0610199Y2 - Rotation damper - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rotary damper that rotatably mounts various parts and articles and keeps the above parts and articles stopped unless force is applied. .

[Conventional technology]

The conventional rotary damper has a fixed body 1 as shown in FIG.
And the rotating body 2 are arranged in series, and the projecting shaft 4 protruding from the end face center of the rotating body 2 is rotatably penetrated through the through hole 3 provided in the shaft core of the fixed body 1, and by the ring 5. When the protruding shaft 4 is prevented from coming off, and then the coil spring 6 is fitted on both outer sides of the fixed body 1 and the rotating body 2, the rotating body 2 is rotated in one direction to form a spring clutch. Although the rotating body 2 is tightened and locked by the spring 6, it is rotated when a torque larger than that is applied,
Further, when it is rotated in the opposite direction, the spring 6 is loosened so that the spring 6 rotates with the torque or less.

[Problems to be solved by the invention]

According to the above configuration, the braking portion of the spring that is actually acting is only the portion wound around the rotating body, so there is a problem in that the braking efficiency is low when viewed from the whole.

Further, since stress concentrates on the winding portion at the boundary between the fixed body and the rotating body of the spring, there is a problem that the stress concentrated portion is disconnected in a short period of time.

[Means for solving problems]

In order to solve the above problems, the present invention provides a rotating shaft, a coil spring wound around the rotating shaft so as to be tightened, a plate surface facing one end of the spring, and a rotating shaft A stationary plate-shaped body that penetrates through the spring, a protrusion that protrudes from one end of the spring, and that is provided on the plate surface of the plate-shaped member that is located on the turning line of the protrusion and that engages with the protrusion. A rotary damper composed of a large number of sawtooth-shaped stoppers for stopping only the rotation of the spring in the winding direction is adopted.

[Action]

When the shaft is forced to rotate in the winding direction of the spring, the spring also tries to rotate at the same time.

However, since the rotation of the spring is stopped by the engagement between the stopper and the protruding portion, slippage occurs between the spring and the shaft, and the shaft can be rotated.

Further, when no rotational force is applied to the shaft, the rotation of the shaft is suppressed by the prevention of the rotation of the spring by the stopper and the frictional resistance due to the tightening force of the spring.

When the shaft is rotated in the reverse direction, the protrusion of the spring that rotates together rides over the stopper and engages with the next stopper.

Therefore, it is possible to freely change the rotation suppression position of the shaft.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, 11 is a rotary shaft, and this shaft 11
A coil spring 12 is wound around the outside of the.

Outer diameter X of the shaft 11 and inner diameter Y of the spring 12
And X> Y, and the spring 12 is the shaft 1
It is tightened and attached to 1.

Reference numeral 13 is a stopper that engages with a protruding portion 14 extending from one end of the spring 12 to stop the rotation of the spring 12 in the winding direction.

The stopper 13 is a plate surface of the stationary plate body 15 through which the shaft 11 freely penetrates in the center, and has a saw-tooth shape at equal intervals (a large number) on the turning line of the protruding portion 14, and the protruding portion is formed on the saw-toothed vertical surface. When the spring 14 is caught, the rotation of the spring 12 in the winding direction is stopped, and when the spring 14 is rotated in the reverse direction, all the protrusions 14 can ride on the serrated tapered surface.

Although a round wire is used for the spring 12 in the illustrated case, a square wire may be used for obtaining a large friction.

When a clockwise rotating force acts on the shaft 11 shown in FIG. 2, the spring 12 also tries to rotate similarly.

However, since the rotation of the spring 12 is stopped by the stopper 13, the rotation of the shaft 11 is suppressed by the friction due to the tightening force of the spring 12.

As a result, torque is generated in the shaft 11 and acts on the damper.

Further, when a strong rotational force is applied to the shaft 11, the shaft 11 slips and rotates with respect to the spring 12.

When the shaft 11 is rotated in the reverse direction, the protruding portion 14 rides over the stopper 13 and rotates freely, and when the reverse rotation of the shaft 11 is stopped, the protruding portion 1 is attached to the stopper 13.
4 engage.

〔effect〕

As described above, according to the rotary damper of the present invention,
Since the entire length of the coil spring can be the braking portion, highly efficient rotation suppression can be obtained.

Further, since the stress is distributed over the entire spring, it is possible to eliminate the problem that the stress is concentrated and cut in a part.

Further, it can be used as a torque limiter other than the rotary damper.

Further, since the one end protruding portion of the spring is engaged with a large number of stoppers to stop only the rotation of the spring in the winding direction, it is possible to make a difference in the generated torque in the clockwise and counterclockwise directions.

Therefore, it can be stopped even if its own weight acts in the descending direction, and the stop position can be freely converted by many stoppers.

[Brief description of drawings]

FIG. 1 is a front view of a rotary damper according to the present invention, FIG. 2 is a side view of the same, FIG. 3 is a side view of a shaft, FIG. 4 is a side view of a spring, and FIG. 5 is one of conventional rotary dampers. It is a partial cutaway front view. 11 ... Shaft, 12 ... Spring, 13 ... Stopper, 14 ... Projection part, 15 ... Plate-shaped body.

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft, a coil spring wound around the shaft in a tightened state, and a stationary plate-like member having a plate surface facing one end of the spring and the rotary shaft being freely penetrated. , A protrusion protruding from one end of the spring, and being provided on the plate surface of the plate-shaped member positioned on the turning line of the protrusion, and engaging with the protrusion to rotate the spring only in the winding direction. A rotary damper consisting of a number of serrated stoppers to stop the movement.