Machine element or mechanism – Control lever and linkage systems – Elements
Patent
1987-09-14
1990-02-06
Luong, Vinh T.
Machine element or mechanism
Control lever and linkage systems
Elements
280265, 280261, 745341, G05G 114
Patent
active
048980471
ABSTRACT:
Apparatus is provided for propelling a bicycle. In a preferred embodiment a crank and a sprocket are included which are rotatable relative to one another and have a common center of rotation. A guide fixedly attached to the sprocket constrains a sliding member having a hole through which an arm of the crank passes, such that rotation of the crank relative to the sprocket urges the sliding member along the guide. A compression spring disposed between a shoulder on the guide and the sliding member is compressed as the sliding member is urged along the guide. Hence, during a power stroke, an applied force on the crank causes the crank to advance rotationally ahead of the sprocket position during the first half of the stroke, urging the sliding member along the guide and compressing the spring. The spring stores the work of compression during the first half of the stroke as potential energy. During the second half of the stroke the spring releases the stored potential energy to the sprocket.
REFERENCES:
patent: 620164 (1899-02-01), Mumford et al.
patent: 621883 (1899-03-01), Whitney et al.
patent: 1323004 (1919-11-01), Boyd
patent: 2316530 (1943-04-01), Nilsen
patent: 3779099 (1973-12-01), Trammell
patent: 4583422 (1986-04-01), Boyd
Luong Vinh T.
Smith Joseph H.
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