| 摘要 |
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.
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