Quick release derailleur
AssigneeShimano Inc.
InventorTadashi Ichida
Life of this patent
Estimating the term…
Abstract
A quick-release bicycle derailleur includes a base member, a movable member supporting a chain guide, and a linkage mechanism coupling the base member to the movable member so that the movable member moves relative to the base member. A draw bar extends from the base member and has a cam follower at the base member. A rotary cam is supported by the base member and contacts the cam follower so that rotation of the rotary cam pulls the drawbar into the base member. A nut may be fitted to the other end of the draw bar so that the base member and the nut securely fix the derailleur to a pair of fork ends on the bicycle frame.
Claims12
A bicycle derailleur for attachment to a wheel having a hollow hub axle comprising:
- a base member;
- a movable member supporting a chain guide;
- a linkage mechanism coupling the base member to the movable member so that the movable member moves relative to the base member;
- a draw bar extending from the base member and having a cam follower at the base member, the drawbar being sized to extend through the hollow axle;
- and
- a rotary cam supported by the base member and contacting the cam follower so that rotation of the rotary cam pulls the drawbar into the base member.
A bicycle derailleur apparatus comprising:
- a wheel hub that rotates around a hollow hub axle;
- a derailleur including:
- a base member;
- a movable member supporting a chain guide;
- a linkage mechanism coupling the base member to the movable member so that the movable member moves relative to the base member;
- a draw bar extending from the base member through the hollow hub axle and having a cam follower at the base member;
- and
- a rotary cam supported by the base member and contacting the cam follower so that rotation of the rotary cam pulls the drawbar into the base member.
Dependencies are inferred from the claim text.