Patent ID: 6290028
Filing Date: 2001-09-18
Classification: B62L,F16D

Abstract:
A bike brake comprising a brake drum combined with a wheel shaft, a drum cap fixed on a frame of a bike and closed on said brake drum, plural brake bands and a braking structure contained in said brake drum and said drum cap; said brake bands respectively having a curved recess in a front end and a curved surface formed in a lower edge of a rear portion, said curved surface not parallel to an outer edge of said brake band; said stopping structure having plural stopping means, plural springs respectively able to push each said stopping means upward and outward to let each said stopping means rest on said curved surface of each said brake band, said stopping means pushed upward and outward by said springs to move said brake bands outward to contact and rub against said inner annular wall of said brake drum to produce a first stage of braking action when said stopping structure is operated to turn to alter its angle; said stopping means moving down and inward and said springs also shrinking when reaction force between said stopping means and said brake bands becomes greater than the set elasticity of said springs, said stopping means producing a second stage of strong braking action when said stopping means moves down to be stopped by said stop plates of said separator.