Derailleur for a bicycle
First Claim
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1. A derailleur for a bicycle, which is pulled by .[.control wires.]. .Iadd.at least one control wire .Iaddend.to change the speed of the bicycle by moving a driving chain to a selective sprocket of a freewheel, said derailleur comprising:
- a. four members including a first fitting member, second and third linkage members each pivotally mounted at one end to said fitting member, and a fourth movable member pivotally supported at one end to each other end of said linkage members, said linkage members being swingable with respect to said fitting member and with respect to each other, said fourth movable member being swingable with respect to said linkage members and to said fitting member;
b. cages coupled to the other end of said fourth movable member and having two chain guide pulleys freely movable with said fourth movable member to move the driving chain; and
c. means, coupled on two of said four members which are movable with respect to each other, for maintaining the position of said cages, said maintaining mean including a holder on one of said two members and having a plurality of engageable portions, and a retainer on the other of said two members and engageable with any one of said engageable portions.
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Abstract
A derailleur for a bicycle, which comprises four members, including a fitting member, two linkage members and a movable member, all movable with respect to each other. Between two of the members there is a device for positioning cages having chain-guide pulleys mounted on the movable member, whereby the derailleur enables the cages to be properly positioned and kept in the position at each speed-change stage of the bicycle so that an accurate and light speed-change operation may be performed.
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Citations
25 Claims
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1. A derailleur for a bicycle, which is pulled by .[.control wires.]. .Iadd.at least one control wire .Iaddend.to change the speed of the bicycle by moving a driving chain to a selective sprocket of a freewheel, said derailleur comprising:
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a. four members including a first fitting member, second and third linkage members each pivotally mounted at one end to said fitting member, and a fourth movable member pivotally supported at one end to each other end of said linkage members, said linkage members being swingable with respect to said fitting member and with respect to each other, said fourth movable member being swingable with respect to said linkage members and to said fitting member; b. cages coupled to the other end of said fourth movable member and having two chain guide pulleys freely movable with said fourth movable member to move the driving chain; and c. means, coupled on two of said four members which are movable with respect to each other, for maintaining the position of said cages, said maintaining mean including a holder on one of said two members and having a plurality of engageable portions, and a retainer on the other of said two members and engageable with any one of said engageable portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 25)
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19. A derailleur for a bicycle, which is pulled by .[.control wires.]. .Iadd.at least one control wire .Iaddend.to move cages having two chain guide pulleys to move a driving chain to a selective sprocket of a freewheel to change the speed of the bicycle, said derailleur comprising:
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a. four members including a first fitting member, second and third linkage members each pivotally mounted at one end to said fitting member, and a fourth movable member pivotally mounted at one end to each other end of said linkage members, said linkage members being swingable with respect to said fitting member and with respect to each other, said fourth movable member being swingable with respect to said linkage members and to said fitting member, said fourth movable member at its other end being connectable to the cages; and b. means for maintaining the position of the cages including a holder having a plurality of engageable portions, and a retainer selectively engageable with any one of said engageable portions, wherein one of said holder and said retainer is mounted swingingly on one of said four members so that the position of said holder and said retainer is adjustable relative to each other. - View Dependent Claims (20, 21, 22)
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23. A derailleur for a bicycle which is pulled by control wires to move cages having two chain guide pulleys to move the driving chain to a selective sprocket of a freewheel to change the speed of the bicycle, said derailleur comprising:
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a. four members including a first fitting member, second and third linkage members each pivotally mounted at one end to said fitting member, and a fourth movable member pivotally mounted at one end to each other end of said linkage members, said linkage members being swingable with respect to said fitting member, said fourth movable member being swingable with respect to said fitting member and to said linkage members, said fourth movable member at its other end being connectable to the cages; b. .[.means, connected to at least one of said four members, for maintaining the position of the cages;
.]. .Iadd.means, coupled on two of said four members which are movable with respect to each other, for maintaining the position of said cages, said maintaining means including a holder on one of said two members and having a plurality of engageable portions, and a retainer on the other of said two members and engageable with any one of said engageable portions;
.Iaddend.andc. means, between said fitting member and another of said four members movable with respect to each other, for moving said fourth movable member, including two control wires, a movable plate having two arms respectively retaining terminals of said wires, and a plate fixed to said fitting member and opposite said movable plate, said fixed plate having means for guiding said wires to said movable plate. - View Dependent Claims (24)
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Specification