| 摘要 |
A gas-powered engine assembly is mounted on a carriage supported over the rear tire of a conventional bicycle. The assembly includes a small internal combustion engine supported on the carriage and a driven polyurethane friction wheel for propelling the rear bicycle tire. The assembly includes a compression spring within the carriage tending to move the carriage and engine drive wheel out of engagement with the bicycle rear tire, and a cable and clutch arrangement for lowering the drive wheel into engagement with the bicycle rear tire. A horizontally moveable strut associated with the carriage is selectively manipulated by a manually operated clutch control, whereby the engine drive wheel is moved from an operative to a non-operative position. The output engine drive arrangement includes a multiple tooth cog located within a pocket formed in the drive wheel, for providing a flexible drive mechanism for accommodating possible defects such as a slightly out of round and/or unbalanced tire and the like. The polyurethane drive wheel is adjustably mounted over the tire to accommodate irregularities in the driven bicycle tire, and thus assure constant engagement with the bicycle tire. Brake and operator associated momentary switches for the engine are provided for safety.
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