Derailleur for bicycle
AssigneeShimano Industrial Company Limited
InventorMasashi Nagano
Life of this patent
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Abstract
A derailleur for a bicycle, having four members which include a fitting member, two parallel linkage members and a movable member, among which four members two opposite members comprise one member pivotally supporting a cam plate in swingable relation and another member provided with a pin engageable with the cam face of the cam plate in swinging the cam plate by a pull of a control wire in changing the bicycle speed so that engagement of the cam plate with the pin defines the speed change stage position.
Claims15
A derailleur for a bicycle, which is adapted to change the bicycle speed by shifting a drive chain to one sprocket of a freewheel by means of a pull of a control wire, comprising:
- a. a first fitting member, second and third linkage members pivoted at one end of the fitting member respectively, and a fourth movable member rotatably supported at its one end to the other end of each of the linkage members,
- said linkage members being swingable with respect to said fitting member, said movable member being swingable with respect to said linkage members and movable with respect to said fitting member,
- b. cages connected to the other end of said movable member, said cages carrying guide pulley means and moving together with said movable member to guide said drive chain therewith,
- c. a cam plate pivotally supported at its one end to one of said four members in swingable relation therewith,
- said cam plate having a cam face of a plurality of notches and a retainer attached to the other end opposite to said pivoted one end of the cam plate for retaining a terminal of the control wire, and
- d. a pin fixed to a member, movable relative to said one member pivotally supporting said cam plate among said four members,
- said pin being movable into contact with said cam face to be engaged with said notches respectively.
Dependencies are inferred from the claim text.