CN2273259Y - Fastening pin for aluminium alloy rim connection for bicycle - Google Patents

Abstract

The utility model discloses a fastening pin for aluminium alloy rim connection for bicycles used for fixing the bicycles. The structure of the utility model is of a circular metallic cylinder body. The utility model is characterized in that two sections of threads are arranged on the middle part of surfaces of the cylinder body, and rotating directions of the two sections of threads are opposite. Compared with existing pins with smooth surfaces, the utility model has the advantages of strong fastening forces for the rim connection, and little possibility of fall off.

Description

The tightening pin at a kind of bicycle aluminium alloy wheel rim junction surface

The utility model belongs to the tightening pin of a kind of attachments of a bicycle, particularly aluminium alloy wheel rim.

The tightening pin at the present bicycle aluminium alloy wheel rim junction surface of using always, be that a kind of circular light sliding pin nail, its tightening effect that cooperates with pin hole on the wheel rim are to lean on transition fit power, because the approach axis of smooth pin is identical with the direction of engagement of wheel rim, so a little less than this tightening effect, cause easily to get loose.

The purpose of this utility model provides the tightening pin at a kind of improved bicycle aluminium alloy wheel rim junction surface, and its tightening effect is stronger, is difficult for causing getting loose.

The utility model is achieved in that the tightening pin at a kind of bicycle aluminium alloy wheel rim junction surface, is the metal cartridge of a circle, it is characterized in that described damaged surface with regard to each has two sections screw threads to both end extension in the middle of it, and the rotation direction of these two sections screw threads is opposite.

Such scheme is that two sections screw threads that rotation direction is opposite are set on the pin surface, when the wheel rim junction surface is subjected to external force pressure, pin to enter the wheel rim pin hole, pin can produce rotation, the screw thread on pin surface is just pin hole tapping negative thread, form screw thread fit, the screw thread fit of Xing Chenging is very tight and the effect of transition fit is arranged like this, can make the tightening power at wheel rim junction surface strong, is difficult for getting loose.

Below in conjunction with accompanying drawing the utility model is done to describe more specifically.

Fig. 1 is the scheme drawing of a kind of scheme of the utility model.

Fig. 2 is 1 the pin and the mated condition scheme drawing at wheel rim junction surface.

With reference to Fig. 1～Fig. 2, this tightening pin is the steel cylinder 1 of a circle, is characterised in that just each has two sections screw threads 2 and 3 to both end extension in the middle of it on cylinder 1 surface, and these two sections screw threads 2 and 3 rotation direction are opposite.During use, pin 1 is matched with the pin hole on the both sides 5 and 6 at wheel rim 4 junction surfaces as Fig. 2, when both sides, junction surface 5 and 6 are subjected to the external pressure effect approaching gradually, pin 1 can enter in the pin hole in rotation, at this moment the screw thread of pin 1 can and be made screw thread fit closely with it to the cooresponding negative thread of pin hole tapping, when both sides, junction surface 5 and 6 were close to, pin 1 was with regard to entering fully in the pin hole and lock the wheel rim junction surface.

Claims (1)

1. The tightening pin at a kind of aluminium alloy wheel rim voluntarily junction surface is the metal cartridge of a circle, it is characterized in that described damaged surface with regard to each has two sections screw threads to both end extension in the middle of it, and the rotation direction of these two sections screw threads is opposite.

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