Bicycle brake lever

Abstract

A bicycle brake lever is used on a handlebar of a bicycle and has a body, a hydraulic cylinder, an oil jacket, a cap and a leakage proof element. The body is mounted with the handlebar of the bicycle and has a threaded hole and a lever. The hydraulic cylinder is mounted on the body and has an oil chamber, a piston and an annular groove. The piston is mounted moveably in the oil chamber and is connected with the lever. The annular groove is formed around the external surface of the hydraulic cylinder and has two transmitting holes. The oil jacket is mounted around the hydraulic cylinder over the annular groove, is made of translucent material and has a tube. The cap is mounted over the opening of the tube. The leakage proof element is mounted between the opening of the tube and the cap.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a bicycle brake lever in accordance with the present invention;

FIG. 2 is an exploded perspective view of the bicycle brake lever in FIG. 1;

FIG. 3 is an operational side view in partial section of the bicycle brake lever in FIG. 1; and

FIG. 4 is an operational side view of the bicycle brake lever in FIG. 1.

Claims

1. A bicycle brake lever for being used on a handlebar of a bicycle and having a body adapted for being mounted with the handlebar of the bicycle and having a threaded hole defined in the body;a connecting collar formed on the body and used to mount rotatably around the handlebar of the bicycle; anda lever mounted pivotally with the body near the threaded hole and having a shaft extending into the threaded hole;a hydraulic cylinder mounted on the body and having a proximal end;a distal end;an external surface;an outer thread formed around the external surface near the proximal end of the hydraulic cylinder and screwed with the threaded hole of the body;an oil chamber formed inside the hydraulic cylinder;a piston mounted moveably in the oil chamber and having a front end connected with the shaft of the lever; anda rear end; andan annular groove formed around the external surface between the proximal end and the distal end of the hydraulic cylinder and having two transmitting holes formed longitudinally through a bottom of the annular groove and communicating with the oil chamber;an oil jacket mounted around the hydraulic cylinder over the annular groove, made of translucent material and having a tube formed radially on the oil jacket at a position corresponding to the annular groove and having an opening;a cap mounted over the opening of the tube; anda leakage proof element mounted between the opening of the tube and the cap to prevent the oil leaking from the oil jacket.

2. The bicycle brake lever as claimed in claim 1, wherein the hydraulic cylinder has two O-rings mounted around the hydraulic cylinder respectively at two sides of the annular groove and contacting with the oil jacket.

3. The bicycle brake lever as claimed in claim 2, wherein the cap has a center; anda through hole formed through the center of the cap and communicating with the opening of the tube; andthe leakage proof element has a center; andan elastic element formed on the center and protruding into the tube.

4. The bicycle brake lever as claimed in claim 1, wherein the cap has a center; anda through hole formed through the center of the cap and communicating with the opening of the tube; andthe leakage proof element having a center; andan elastic element mounted on the center and protruding into the tube.