Patent ID: 6159118
Filing Date: 2000-12-12
Classification: B62M

Abstract:
A bicycle frame having a rear wheel rotatably secured to said frame and the rear wheel having mounted thereon coaxially at least two spaced apart rear main sprockets for being driven by a roller chain the bicycle frame having a derailleur arm attached thereto for selecting from among the rear main sprockets for engagement by the roller chain, a roller chain support mechanism comprising a support frame secured to an end of the derailleur arm attached thereto, the support frame including resilient bias means for supporting a rear take-up guide pulley adapted for urging said roller chain in an outboard direction, wherein the resilient bias means additionally comprises:a guide, supported on the support frame; anda plunger rod, adapted to be disposed within the guide, the plunger rod being resiliently biased against the guide, and the rear take-up pulley being mounted to an outboard end of the plunger rod.