| 摘要 |
A disc brake comprises a base, a disc, two linkages pivoted on the base, wherein the linkages are respectively extended at opposite sides of the disc and along an orientation deviated from a diameter orientation of the disc, two brake blocks mounted on the linkages respectively and facing the disc wherein the brake blocks keep predetermined distances from the disc at initial, and a cable connected to the linkages to move the linkages towards the disc. The linkages serve as a pair of type 2 levers wherein the arm of input (the cable) is larger than the arm of output (the brake block). The linkages, therefore, have mechanical advantages larger than 1 so that less power of the cable input will provide greater power of braking.
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