| 摘要 |
A speed changing mechanism operable during both kinetic and static conditions. A gear 28 driven by bicycle pedals 30 in turn drives gear 32. Holes 38 in the face of the latter gear are engaged by gear 64 which is integral with output shaft 42. One end 72 of the output shaft is loosely supported in cup 78 whereby the shaft may be laterally shifted, then axially shifted so that gear 64 is withdrawn from one set of the holes 38, then reengaged with another set of the holes 38.
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