Machine element or mechanism – Gearing – Toothed gear and recirculated unconnected elements
Patent
1975-02-19
1977-01-11
Scott, Samuel
Machine element or mechanism
Gearing
Toothed gear and recirculated unconnected elements
74242, F16H 722, F16H 924
Patent
active
040020800
ABSTRACT:
A derailleur gear for a bicycle comprises a chain displacement means having a rigid linkage part movable transversely of the rear wheel in a direction generally along the axis of the rear wheel of the bicycle, the linkage part forming a side link in a support parallelogram linkage that includes vertically movable interconnected link portions connected to the rigid linkage part, the support parallelogram being in a plane generally transverse to the axis of the rear wheel. The chain guide pulley or sprocket is rotatably mounted on a spindle carried by a vertically movable portion of the support parallelogram linkage, as is an elongated cap or arm member that supports a chain tension pulley at a remote end from the spindle-connected end. A coil spring normally resiliently biases the vertically movable portions of the support parallelogram upwardly generally towards the rear wheel axis, and various motion limiting features are included. The coil spring also maintains the chain tension pulley in desired position to maintain chain tension. The displacement means itself may be a parallelogram linkage lying in a plane extending transverse to the plane of the support parallelogram linkage, with the rigid linkage part comprising a mutual link connecting the parallelogram linkages in a novel manner.
REFERENCES:
patent: 3896679 (1975-07-01), Huret et al.
Huret Jacques
Huret Roger
Burke A. Russell
Scott Samuel
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