Adjustable elliptical crank mechanism
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 16, 1993
Grant Date -
N/A
app pub date -
Oct 2, 1989
filing date -
Oct 2, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A crank mechanism is provided which has a first driven member constituted by a first shaft, and a second driven member constituted by a sleeve member-disposed around said first shaft. The sleeve member is retained in support means such that the sleeve member and the first shaft can rotate relatively to one another. A rotating arm is connected to the sleeve member, and attachment means is slidable along said rotating arm. First linkage means is provided between said attachment means and said first shaft, and second linkage means is provided between said sleeve member and said first shaft, whereby said attachment means can selectively describe any of a range of circular or elliptical paths. In the preferred embodiment, the linkage means are adjustable and include a counter-rotating arm associated with said first shaft, and a second shaft and a third shaft and gears associated therewith and with said first shaft, which gears transmit rotational movement from said first shaft to said sleeve member. The invention is easily adaptable for physical therapy applications and for use as a drive mechanism for a bicycle.
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