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US 6,589,139 B1Granted
Exercise and rehabilitation equipment
OwnerPaul John Butterworthinventor
Life of this patent
Estimating the term…
Abstract
A cycle (or an adaptation for a cycle) comprises a primary crank arranged for rotation about a first axis, a secondary crank, and connection means for selective connection of the secondary crank to the primary crank at a selected one of a plurality of positions on both the primary crank and the secondary crank. A pedal is mounted on the secondary crank, and selectively operable means is provided for either permitting or preventing rotation of the secondary crank relative to the primary crank, in dependence of the nature of the disabilities or injuries of the user of the cycle.
Claims2
A crank assembly comprising:
- A. a primary crank formed with a row of holes and arranged for rotation about a predetermined axis of rotation;
- B. a secondary crank formed with a row of holes;
- C. connection means engageable with a selectable one of each row of holes for selective connection of the secondary crank to the primary crank at a selected one of a plurality of positions on at least one of said cranks,
- D. a pedal mounted on the secondary crank;
- E. means for preventing rotation of the secondary crank relative to the primary crank so that when, in use, a user then applies pressure to the pedal, the primary and secondary cranks rotate in unison about said predetermined axis of rotation, and
- F. means for permitting rotation of the secondary crank relative to the primary crank so that when, in use, a user then applies pressure to the pedal, the primary crank will rotate about said predetermined axis of rotation and the secondary crank will pivot relative to the primary crank.
3 more elements
Dependencies are inferred from the claim text.