Machine element or mechanism – Elements – Cranks and pedals
Patent
1990-02-08
1992-01-07
Luong, Vinh T.
Machine element or mechanism
Elements
Cranks and pedals
745946, G05G 114
Patent
active
050780263
ABSTRACT:
This device includes a cam which can be adjustably secured intermediate the pedal of a bicycle, which pedal is rotatably mounted on an axle, and the rotary crank of the bicycle to which the pedal axle is secured. The cam carries and defines at least one detent for mechanical engagement. The device also includes a latch mechanism which carries a pawl for releasably mechanically engaging the detentes carried by the cam. A mechanism is provided for normally biasing the pawl into engagement with the detent of the cam. Each of the detentes which is carried by the cam is designed to be located and positioned so that, in conjunction with the pawl, it can position the pedal in one or more desired orientation. One such preferred fixed orientation is with the upper surface of the pedal being horizontal, that is "up," when the crank is in a substantially top dead center position. A second preferred fixed orientation is with the upper surface of the pedal being "up," when the crank is in a substantially bottom dead center position. A mechanism is also connected to the latch to cause the disengagement of the pawl from the cam detent. When the pawl is disengaged from the cam detent, free rotation of the pedal on its axle relative to the rotary crank is permitted. The latch disengaging mechanism is activated when the foot of a cyclist is placed on the upper surface of the pedal.
REFERENCES:
patent: 578183 (1987-03-01), Anderson
patent: 631276 (1893-08-01), Bulova
patent: 642874 (1900-02-01), Park
patent: 3788163 (1974-01-01), Gause et al.
patent: 4103563 (1978-08-01), Genzling
patent: 4625580 (1986-12-01), Burt
Luong Vinh T.
Margolis Donald W.
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