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Transmission for bicycles

  • US 4,900,046 A
  • Filed: 10/06/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 10/06/1987
  • Status: Expired due to Fees
First Claim
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1. Transmission for a bicycle having a nucleus assembly supporting a pedal shaft and a chassis connecting said pedal shaft to a rear wheel of the bicycle, the transmission comprising a first rimcarrier plate rigidly connected to the pedal shaft of the bicycle, a first set of concentric guiding rims fixed to said rimcarrier plate, a drive shaft positioned in said chassis, a first set of pinions permanently engaging said rims and mounted with freedom of rotation on said drive shaft which is radially extended from the pedal shaft to the rear wheel of the bicycle, said drive shaft being a hollow transmission shaft, first means positioned in said hollow transmission shaft for selectively connecting each one of said pinions to said transmission shaft, second selecting means provided on the other end of said transmission shaft, a second rimcarrier plate mounted with freedom of rotation on an additional shaft rigidly connected to the chassis and extending perpendicular to said transmission shaft, a second set of guiding rims rigidly connected to said second rimcarrier plate, a second set of pinions permanently engaging said respective rims of said second set, a multiplying planet assembly including said second rimcarrier plate and pawls provided thereon, said additional shaft having thereon an outlet pinion which plays on an engaging tack of said rear wheel, and said second selecting means selectively connecting one of said pinions of said second set to said transmission shaft and via said second rimcarrier plate, said multiplying planet assembly and said pawls transmitting a movement of said transmission shaft to said additional shaft and thereby to said outlet pinion, said chassis serving as one of the two arms of a fork connecting the rear wheel to said nucleus.

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