Patent ID: 11919607
Assignee: SHIMANO INC.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 21:
22. A bicycle rear derailleur for coaxial installation on a rear-wheel axis of a bicycle, the bicycle rear derailleur comprising:
a base element including a first attachment end being configured to be coaxially installed on the rear-wheel axis and a second attachment end;
a movable element movably arranged relative to the base element;
a linkage mechanism connecting the movable element to the base element;
a chain guide arrangement rotatably connected to the movable element about a rotational axis; and
a fastener element configured to fix the first attachment end of the base element to a frame of the bicycle such that a fastener center axis of the fastener element and the rear-wheel axis are coaxial in a mounting state of the bicycle rear derailleur, the fastener element having a tubular portion and a radially projecting portion with respect to the fastener center axis, the radially projecting portion extending radially outwardly from one axial end of the tubular portion with respect to the fastener center axis;
the second attachment end being coupled to the linkage mechanism,
the first attachment end having a first arm and a second arm, which are arranged so as to be spaced apart from each other in an axial direction with respect to the rear-wheel axis such that the second arm is disposed closer to an axial center plane of the bicycle than the first arm in the mounting state of the bicycle rear derailleur,
the first arm of the base element having a first attachment opening configured such that the tubular portion of the fastener element passes through,
the first arm being at least partially disposed in an axial space between the frame and the radially projecting portion of the fastener element in the axial direction with respect to the rear-wheel axis in the mounting state of the bicycle rear derailleur,
at least a portion of the radially projecting portion protruding radially outward beyond a peripheral surface of the first arm.