US 5,846,148 A · Bicycle front derailleur

Abstract

A bicycle front derailleur includes a frame bracket for fixing the derailleur to a bicycle frame, a cage plate for guiding a chain among a plurality of chainwheels, and a radial adjustment mechanism for adjusting a position of the cage plate substantially radially relative to the chainwheels. In a more specific embodiment, a derailleur bracket fixes the cage plate to the frame bracket, wherein the derailleur bracket defines a derailleur bracket opening. A bushing is disposed in the derailleur bracket opening. The bushing defines a bushing opening such that the bushing has an eccentric shape relative to the bushing opening. A fastener extends through the bushing opening for fastening the bushing to the frame bracket. Thus, rotation of the bushing varies the position of the derailleur bracket and hence the position of the cage plate relative to the chainwheels.

Claims17

Dependent claims

A bicycle front derailleur comprising:

a frame bracket (2) for fixing the derailleur to a bicycle frame, wherein the frame bracket includes an opening (3) that aligns with an opening (30) in a bottom bracket (20) when the frame bracket (2) is mounted to the bicycle frame;
a cage plate (36) for guiding a chain (51) among a plurality of chainwheels (52, 53, 54);
and
radial adjustment means (7, 8, 11, 12) for adjusting a position of the cage plate (36) substantially radially relative to the chainwheels (52, 53, 54).

1 more element

Dependencies are inferred from the claim text.

Bicycle front derailleur

Life of this patent

Bicycle front derailleur

Life of this patent

Abstract

Claims17