JP2529304Y2 - Pulley mounting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a pulley mounting device.
In particular, a pusher that can be easily rotatably mounted on a shaft
It relates to a remounting device. 2. Description of the Related Art Conventionally, as a pulley of this type, as shown in FIG. 5, it has an elastic effect by extending axially from the periphery of a central hole of a pulley 27. There has been proposed a type in which a plurality of hooks 28 are rotatably held on the shaft 26 by fitting into a groove 26 formed on the peripheral surface of the shaft 25. [0003] Considering the durability and flexibility of a hook having the above-described shape, the length in the axial direction cannot be reduced so much. −
Efficiency was not so good. Further, when the pulley receives a force in the axial direction indicated by the arrow, the friction between the hook and the shaft increases, and an excessive load is applied to the hook portion. [0004] An engagement groove surrounding the peripheral surface is provided.
A formed shaft and a center for the shaft to pass through the center
Engageable with the hole and the engagement groove of the shaft passing through the center hole
Pulley mounting device consisting of a pulley having a hook
The hook is connected to a pair of side portions of the pulley.
A predetermined distance from the virtual center axis of the center hole on the other side
It is held at a remote position and its tip penetrates
In order to be able to engage with the engagement groove of the shaft, the virtual center
An elastic extension that extends parallel to a virtual plane perpendicular to the axis
Have . [0005] With respect to the shaft passing through the center hole, the foot
The elastic extension extending parallel to the virtual plane of the
The pulley is mounted such that it bends and its tip engages with the engagement groove of the shaft. The pulley is restricted from moving in the axial direction and is rotatably held. FIG. 2, FIG. 1, and FIG. 3 are a front view, a top view, and a perspective view, respectively, of a pulley according to the present invention. A groove 2 for attaching a belt is formed on the peripheral surface of the pulley 1, and a central hole 3 through which a shaft passes is formed in the center.
A pair of hooks 7 and 8 are integrally held by holding portions 5 and 6 at a predetermined distance from the center hole 3 on an upper surface portion 4 corresponding to one side surface portion of the pulley 1. This hook 7
Is bent at a right angle on the slightly upper surface of the holding portion 5 so that the upper surface portion 4
And a tip portion thereof is formed above the center hole 3 of the pulley 1 so as to face a tip portion of a hook 8 similarly formed. These hooks 7 and 8
Its tip has elasticity that allows it to move slightly up, down, left and right with a restoring force. Further, projections 9 and 10 projecting toward the center are formed at the tips of the hooks 7 and 8, respectively. The projection 9 has an inclined surface 11 (FIG. 2) inclined with respect to the axial direction and an opposite surface 1 parallel to the tangential direction of the shaft.
3 (FIG. 1) forms a tapered shape. The opposing surface 13 and the opposing surface 14 of the protrusion 10 of the hook 8 formed in the same manner are opposed to each other at a position h slightly facing the center hole 3 from both sides at a distance h. An extension 16 having an abutment plane 17 facing the regulating surface of the shaft is formed on the lower surface 15 which is the other side surface of the pulley 1 as described later. FIG. 4 shows the pulley 1 formed as described above.
Shows a state where the buried portion 22 is fixed to a base (not shown) and attached to a shaft 18 to be erected. The center diameter D1 of the shaft 18 and the inner diameter of the center hole of the pulley 1 are considered so that the pulley can rotate freely, and the diameter of the shaft flange 20 is set to the center diameter D1. I have. Furthermore, this shaft 18
A regulating plate 21 having a groove 19 having a diameter D2 substantially equal to the distance h between the opposing surfaces of the pulley 1 and having the regulating surface 23 in contact with the contacting plane 17 of the pulley to regulate its axial movement. have. The process of mounting the pulley 1 will be described.
The pulley 1 is brought in such that the shaft 18 enters the center hole 3 from the lower surface 15 side. And pulley 1 to shaft 1
4 in the direction of arrow A in FIG.
The flange portion 20 of 8 penetrates the center hole 3 of the pulley 1 and eventually comes into contact with the inclined surfaces 11 and 12 of the pair of hooks 7 and 8. When the pulley 1 is further moved in the direction of arrow A, the flange portion 20 acts on the inclined surfaces 11 and 12 to push and spread the hooks 7 and 8, and the contact flat surface 17 of the pulley 1 eventually becomes a regulating plate for the shaft. 21 is brought to a position where it comes into contact with the regulating surface 23. At this time, the flange portion 20 passes through the inclined surface, and the protrusions 9 and 10 of each hook reach the groove 19 of the shaft and are restored to the state shown in FIG. In the state shown in FIG. 4, the pulley 1 is rotatably held by the axial movement thereof being regulated by the shaft flange portion 20 and the regulating plate 21. In the above embodiment, the bottom surfaces of the tip portions of the hooks 7 and 8 are formed so as to be separated from the upper surface portion 4 of the pulley, and are formed to be able to bend in the axial direction. Although the hooks may be formed and the hooks are paired, one or three or more hooks may be formed. Further, in the embodiment, the movement of the pulley in one of the axial directions is restricted by the restriction plate 21. However, by considering the engagement relationship between the projection of the hook and the groove of the shaft, in some cases, Can be deleted. According to the present invention, the pulley can be smoothly mounted on the shaft, and the space efficiency in the axial direction of the device is not significantly impaired. Further, since the bottom surfaces of the tips of the hooks 7 and 8 are formed apart from the upper surface 4 of the pulley as in the embodiment, the axial force applied to the pulley is reduced by the elasticity of the hook. It can absorb and prevent damage to the pulley.

[Brief description of the drawings] FIG. 1 is a top view of a pulley according to an embodiment of the present application. FIG. 2 is a front view of the pulley according to the embodiment of the present application. FIG. 3 is a perspective view of a pulley according to an embodiment of the present application. FIG. 4 is a configuration diagram of an apparatus according to an embodiment of the present application. FIG. 5 is a configuration diagram of a main part of a conventional device. [Explanation of symbols] 1 pulley 3 center hole 4 Top section 5 Holder 6 Holder 7 hook 8 hooks 9 Projection 10 Projection 16 Overhang 18 axes 19 Groove 20 Flange 21 Regulation board 22 Buried part

Claims (1)

(57) [Scope of request for utility model registration]A shaft formed with an engagement groove surrounding the peripheral surface, A central hole through which the shaft passes through the central hole,
Having a hook engageable with the engaging groove of the shaft passing therethrough.
A pulley mounting device comprising: The hook is one side of a pair of side portions of the pulley.
Above and at a predetermined distance from the virtual center axis of the center hole
And the tip of the shaft
Perpendicular to the virtual central axis so that the engagement groove can be engaged
Having an elastic extending portion extending in parallel with the
The pulley mounting device.