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Caliper brake for mountain bicycles having wide tires

  • US 4,765,443 A
  • Filed: 03/31/1987
  • Issued: 08/23/1988
  • Est. Priority Date: 06/03/1985
  • Status: Expired due to Fees
First Claim
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1. A caliper brake for wide-tire bicycles having a frame and wheels with a narrow rim and a tire wide relative to the rim, including in combinationa pair of stationary pivot posts rigidly, permanently, and immovably secured directly to said frame, one on each of the opposite sides of the tire and rim,a caliper arm for each said pivot post having an intermediate pivot portion rotatably mounted on said pivot post, a shoe-attachment end on one extremity, and a cam-facing end at its other extremity,a separate return spring for each pivot post, each having one end adjustably secured relative to said pivot post and a second end acting on said caliper arm to exert a return force thereon,a polygonal keyed retention means for frictionally retaining said spring in a stationary position relative to said pivot post while enabling purposeful adjustment of that position at all times while said retention means is fully tight, and at all times enabling relative rotary movement of said spring relatively to said pivot post,a brake shoe holder with a brake shoe therein, mounted on the shoe-attachement end of said caliper arm,a roller-mounting post secured to the cam-facing end of each said caliper arm,a cam roller mounted rotatably on each said roller mounting post and having a circumferential groove therein,a cam plate having two opposite cammed edges in engagement with said grooves in said rollers, said cammed edges being shaped to cause substantial increases in force the further said cam plate is moved during brake application relative to said cam rollers, anda brake-actuating cable secured to said cam plate along the central axis thereof for moving said cam plate relative to said cam rollers and thereby to spread said cam rollers apart and force said brake shoes inwardly,said bushing enabling alignment of said caliper arm thereon with said cable.

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