Land vehicles – Wheeled – Occupant propelled type
Patent
1989-04-21
1990-06-26
Marmor, Charles A.
Land vehicles
Wheeled
Occupant propelled type
280261, 280238, 475277, B62M 102
Patent
active
049365975
ABSTRACT:
An enclosed multiple speed drive for a tandem bicycle locates the pedal drive shaft for the rear rider on the axis of the rear wheel. The drive features a chain case which replaces the chain stay on the right side of the bicycle and an improved ten speed planetary transmission housed within a gear case inside the rear wheel hub. The chain case is press fit on a steel tube rotatably mounted in the bottom bracket, and a chain case cover on the right side, and a sun gear carrier on the left side, are clamped in the rear dropouts with over center quick releases. To change the rear tire, the chain case cover and the sun gear carrier are released from the dropouts and the chain case is rotated about the axis of the bottom bracket to swing the wheel clear of the frame. The tire can then be peeled off the rim from the left side and replaced without removing the wheel from the gear case or disturbing any of the drive train components.
REFERENCES:
patent: 428991 (1890-05-01), Woodward et al.
patent: 2385892 (1945-10-01), Swanson
patent: 4706982 (1987-11-01), Hartmann
patent: 4721015 (1988-01-01), Hartmann
patent: 4770433 (1988-09-01), Hartmann
Marmor Charles A.
Yoon Wook
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