JPS6123705Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a roller chain joint used for endlessly connecting roller chains formed to have appropriate lengths.

Referring to FIGS. 1 and 2, a conventionally used joint will be described. In order to prevent the joint link plate 2, which has been loosely engaged and inserted into the joint pin 3, from coming off outward, the clip 1 is attached to the joint. It was fitted into the annular groove 3a of the pin. This clip 1 is usually in the shape of a pair of gripping scissors, and in order to fit it into the annular groove 3a of the joint pin, the clip 1 must be pressed from the L direction with a suitable tool.
However, since there are pins 5 and pin link plates 4 adjacent to the joint J in the L direction, attachment of the clip 1 is difficult.

In addition, the base 1a of the clip is convex, which makes it unstable when it comes into contact with the tool. Furthermore, the notch 1c of the clip expands due to the impact when the chain bites into the sprocket, so a moment acts on the clip with the base 1a as the fulcrum and the notch 1c as the point of application.
Due to the action of this moment, at high speeds,
In some cases, the clip was broken by fatigue from the root portion 1a.

As described above, conventional joints have the drawbacks of being difficult to attach clips to, and being unsuitable for high-speed chains.

The present invention is directed to eliminating the above-mentioned drawbacks and to providing a joint which is easy to install and suitable for use with high-speed chains.

This invention will be explained with reference to the embodiments shown in FIGS. 3, 4, 5 and 6. (1) A claw 7a is provided in the center of the clip body 7.

(2) At both ends of the clip body 7, there are semicircular notches 7 that open perpendicularly to the longitudinal direction and have a width slightly larger than the root diameter of the annular groove 3a of the coupling pin 3.
form b.

(3) A hole slightly larger than the shape of the claw 7a of the clip in the center of the joint link plate 8;
Alternatively, the recess 8a is formed and the clip claw 7a is
However, the hole or recess 8a in the joint link plate
so that it can be inserted into

This is a roller chain joint constructed using the clip 7 and joint link plate 8 formed as described above.

Since this invention has the above-described configuration, in order to fit the clip 7 into the annular groove 3a of the joint pin, the clip body 7 is pressed in the U direction with a suitable tool (such as a bench or pliers), and Insert the claw 7a of the clip into the hole or recess 8 of the joint link plate.
Just insert it into a.

This U direction is a free space with no obstacles, and the central part of the clip body that comes into contact with the tool is flat and concave, so the tool is stably supported and the clip can be attached easily. It becomes easier.

Further, the moment generated by the impact when the chain is bit into the sprocket acts with the claw 7a of the clip as a fulcrum and the notch 7b as a point of action. Therefore, the moment acting on the clip 7 has a shorter moment arm compared to the conventional clip. (less than 1/2). Therefore, the clip can withstand high speed chains.

As described above, the joint according to this invention has many advantages, such as being easy to attach clips to and being suitable for high-speed chains. It should be noted that the present invention also covers the case where the recess 8a provided in the joint link plate a is made into a convex part, and the claw 7a of the clip 7 is turned over and used as the recess 7a to form a joint for a roller chain.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a conventional joint, Fig. 2 is a plan view of a conventional joint, Fig. 3 is a front sectional view of a joint according to this invention, and Fig. 4 is a plan view of a clip according to this invention. 5 is a right side view of the clip according to this invention, and FIG. 6 is a plan view of the joint link plate according to this invention. 7a...claw, 7b...notch, 8a...hole.

Claims (1)

[Scope of utility model registration request] In a roller chain joint consisting of a joint pin, a pin link plate, a joint link plate, and a clip, a claw is provided in the center of the clip body, and a semicircular shape opening perpendicular to the longitudinal direction is provided at both ends of the clip body. a clip in which a notch is formed, and a position opposite to the claw of the clip,
A roller chain joint comprising a joint link plate having a hole or recess slightly larger than the shape of the pawl.