Bicycle derailleur structure
OwnerFong P Lininventor
Life of this patent
Estimating the term…
Abstract
A bicycle derailleur structure is mounted on a bicycle frame to correspond to a flywheel unit and includes a support arm, a screw rod, a tension bar, a gear shift unit. and a drive unit. The tension bar has an end having an interior space receiving an elastic member therein to be mounted on the support arm in an elastically oscillating manner. The gear shift unit includes two protector plates in threading engagement with screw rod, and first and second pulleys arranged between the two protector plates. The screw rod is operable to drive the gear shift unit in order to align a chain on the flywheel unit to align with the gear shift unit.
Claims10
A bicycle derailleur structure, comprising at least one support arm, a screw rod, a tension bar, a gear shift unit, and a drive unit,
- wherein the support arm has one end mounted to a bicycle frame;
- the screw rod has one end mounted to the support arm;
- the tension bar has an end having an interior space in which an elastic member, is arranged, such that by means of the elastic member, the tension bar is mounted on the support arm in an elastically oscillating manner, the tension bar having an opposite end that is provided with a guide rod;
- the gear shift unit comprises two protector plates, a first pulley, and a second pulley, the two protector plates being combined together as a one-piece structure having a portion coupled, through threading engagement, to the screw rod, and another portion through which the guide rod extends in a movable manner, the first pulley and the second pulley being arranged between the two protector plates, a chain being wound around the first pulley and the second pulley;
- and
- the drive unit is mounted on the support arm to drive the screw rod to rotate.
Dependencies are inferred from the claim text.