Patent ID: 6089114
Filing Date: 2000-07-18
Classification: B62M,Y10T

Abstract:
A multi-speed transmission for bicycles, comprising:(a) a housing including spaced, opposing face plates, each face plate having a pedal shaft opening and a secondary shaft opening;(b) a pedal shaft rotatably disposed within said pedal shaft openings;(c) a secondary shaft disposed within said secondary shaft openings, wherein the secondary shaft is spaced from the pedal shaft and substantially parallel thereto;(d) a pedal shaft set of gears mounted on the pedal shaft between the face plates, comprising: (1) a first set of pedal shaft gears mounted on the pedal shaft, (2) a second set of pedal shaft gears rotatably mounted on the pedal shaft, and (3) a third set of pedal shaft gears rotatably mounted on the pedal shaft and including first means for selective driving engagement with the second set of pedal shaft gears, the third set of pedal shaft gears including a drive gear means for engaging and drive;(e) a secondary shaft set of gears mounted on the secondary shaft between the face plates, comprising: (1) a first set of secondary shaft gears mounted on the secondary shaft, and (2) a second set of secondary shaft gears rotatably mounted on the secondary shaft and including second means for selective driving engagement with the first set of secondary shaft gears;(f) a set of primary pinion gears rotatably attached to means for selectively engaging each pinion gear between the first set of pedal shaft gears and the first set of secondary shaft gears;(g) a permanent pinion gear engaged between the second set of pedal shaft gears and the second set of secondary shaft gears; and(h) a set of auxiliary pinion gears including: (1) a first pinion gear rotatably attached to first engagement means for selectively engaging the first pinion gear between the first set of secondary shaft gears and the second set of pedal shaft gears; and (2) a second pinion gear rotatably attached to second engagement means for selectively engaging the second pinion gear between the second set of secondary shaft gears and the third set of pedal shaft gears.