Bicycle with rhombus-like gear with circularly curved apexes

Details Bicycle with rhombus-like gear with circularly curved apexes Bicycle with rhombus-like gear with circularly curved apexes

1996-02-01

1999-03-16

Johnson, Brian L.

Land vehicles

Wheeled

Occupant propelled type

74437, F16H 5517, B62M 908

Patent

active

058820256

ABSTRACT:
A bicycle is disclosed with a rhombus-like (preferably 60.degree.-120 .degree.), with circularly curved apexes, drive sprocket gear and a circular driven sprocket on the ear driven wheel. This gear arrangement varies the overall power input from the drive sprocket to the driven gear. The shape of the drive sprocket and the location of the drive pedal changes the gear ratio so that a low gear ratio is utilized during the horizontal portion of movement of the cyclist's legs and a high gear ratio is utilized during the vertical movement of the legs. The gear ratio with the rhomboidal gear is relatively constant during horizontal movement and abruptly changes at the approach to and during vertical movement of the cyclist's legs. While the rhombus-like, with circularly curved apexes, gear is shown primarily for bicycles it may be used in other systems for converting reciprocal to rotary movement with a change in gear ratio.

REFERENCES:
patent: 515449 (1894-02-01), Scovell
patent: 530058 (1894-11-01), Schaum et al.
patent: 571086 (1896-11-01), Fulton et al.
patent: 596289 (1897-12-01), Smith
patent: 650346 (1900-05-01), Tuttle
patent: 2378634 (1945-06-01), Hussey
patent: 3899932 (1975-08-01), Durham
patent: 4260044 (1981-04-01), Foster
patent: 4865577 (1989-09-01), Freudenstein

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