JPS61258641A - Reverse-preventing device - Google Patents

Abstract

PURPOSE:To prevent a clutch spring from deforming and to improve the durability by slidably mounting the spring on the periphery of a rotational shaft, securing its one end to a rockable arm for preventing a reverse rotation, and contacting the other end with other stationary portion. CONSTITUTION:A clutch spring 3 is slidably mounted on a rotational shaft 1 from which projections 2 are projected. A reverse-preventing rockable arm 6 and a stationary pin 9 are arranged on the outer periphery of the shaft 1. The end 4a of the arm 4 of the spring 3 is engaged with the projection 7 of the arm 6, and the other end 8 is contacted with the pin 9. Thus, when the shaft 1 starts rotating counterclockwise, the end 8 of the spring 9 is engaged with the pin 9, the arm 4 rocks the arm 6 to make contact with the projection 2. Thus, even when the shaft 1 reversely rotates with high energy, it can effectively prevent it from reversely rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reverse rotation prevention device for mechanically restricting the rotation direction of an electric motor or the like capable of forward and reverse rotation to one direction.

BACKGROUND OF THE INVENTION As shown in FIG. 4, the clutch spring 21 conventionally used in this type of reverse rotation prevention device generally had its end 21 & wrapped around a rotating shaft 22.

Problems to be Solved by the Invention However, in this configuration, the rotating shaft 22 rotates in reverse, and if the force is strong, the clutch spring 21 will be gradually wound around the rotating shaft 22. As this process is repeated, the clutch spring 21 becomes deformed, and there is a problem in that it becomes impossible to prevent reverse rotation.

The present invention solves the above-mentioned conventional problems, and aims to provide a durable reverse rotation prevention device that prevents deformation of the clutch spring.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a rotating shaft provided with a protrusion on its outer circumferential surface, and a rotating shaft that is moved from a position where the protrusion comes into contact with the protrusion to stop the rotation of the rotary shaft to a position where it does not make contact with the protrusion. and a clutch spring slidably attached around the rotating shaft, one end of the clutch spring is attached to the arm, and the other end is attached to the arm. It is designed to come into contact with a fixed part provided on the outside of the rotating shaft.

Effects With the above configuration, even when the force of reverse rotation of the rotating shaft is strong, by bringing the end of the clutch spring into contact with the fixed part, the clutch spring can be prevented from being wound around the rotating shaft.

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

In FIGS. 1 to 3, reference numeral 1 denotes a rotating shaft of an electric motor or the like, and a protrusion 2 is provided on the outer circumferential surface of this rotating shaft 1. As shown in FIG. Furthermore, when the rotating shaft 1 rotates counterclockwise,
A tightly wound clutch spring 3 is attached so that the clutch spring 3 is wound around this and rotates together, and is slidable when the clutch spring 3 is rotated in the opposite clockwise direction. One end of this clutch spring 3 is extended to provide an arm portion 4, whose tip 41L is engaged with an arm 6, which will be described later. Further, an arm 6 is swingably supported on the outside of the rotating shaft 1 via a pivot shaft 6, and when the end surface 6 & of the arm 6 comes into contact with the protrusion 2 provided on the rotating shaft 1, the arm 6 rotates. It acts to stop the shaft from rotating 10 times. And, it is possible to swing between a position where the two are not in contact with each other.

7 is a convex portion provided on the arm e, and is located between the pivot shaft 6 and the end surface 61L of the arm 6, and the tip 4a of the clutch spring 3 is pivoted on the convex portion 7 so as to apply rotational force to the arm 6. has been done. 4b is a ring provided in the middle of the arm portion 4 of the clutch spring 3, and the arm portion 4 is bent through this ring 4b to have elastic force. ! Further, reference numeral 8 denotes an end portion provided at the other end of the clutch spring 3, and the end portion 8 comes into contact with a pin 9 provided on the bearing body.

Next, the operation of the reversal prevention device will be explained. When the rotating shaft 1 rotates clockwise, the clutch spring 3 slides on the rotating shaft 1 as shown in FIG. 2, and the sliding resistance forces the arm 4 to move the arm 6 away from the rotating shaft 1. be done. Therefore, the arm 6 is held at a position where it does not come into contact with the protrusion 2. On the other hand, when the rotating shaft 1 rotates counterclockwise,
As shown in FIG. 3, the clutch spring 3 is wound around the rotating shaft 1 and rotates together with the clutch spring 3, and the arm portion 4 is biased to bring the arm 6 closer to the rotating shaft 1. As a result, the end surface 6a of the arm 6 and the protrusion 2 of the rotating shaft 1 come into contact with each other, and the rotation of the rotating shaft 1 is restricted. Here, the rotation of the rotating shaft 1 is too fast, and the first protrusion 2
does not come into contact with the end surface 61L, the rotating shaft 1 makes another half turn to bring the arm closer, and the end surface 6! L and projection 2 come into contact and rotation is stopped. At this time, the clutch spring 3 is wound up a lot, but not more than a certain amount for the end portion 8 to come into contact with the pin 9, and deformation of the clutch spring 3 can be prevented.

Effects of the Invention As is clear from the description of the above embodiments, the present invention prevents deformation of the clutch spring by extending one end of the clutch spring and bringing it into contact with a fixed part provided outside the rotating shaft.
Durability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a reverse rotation prevention device showing an embodiment of the present invention, FIGS. 2 and 3 are plan views of the same device, and FIG. 4 is a perspective view of essential parts of a conventional reverse rotation prevention device. 1... Same mochi axis, 2... Kenki-3...
... Kuratsuchinokune, 6... Arm, 8...
...End, 9...Pin. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
m-axis of rotation? -Protrusion 3-M-Ripe plate introduction-M-Arm Fig. 1 8-End 9-M-Pin No. 2 Diagram Fig. 4

Claims (1)

[Claims] A rotating shaft provided with a protrusion on the outer peripheral surface, an arm pivotally supported to be able to swing between a position where it abuts the protrusion and stops the rotation of the rotating shaft and a position where it does not abut, and an arm that slides around the rotating shaft. and a clutch spring movably attached, one end of the clutch spring is attached to the arm, and the other end is brought into contact with a fixed part provided outside the rotating shaft.