Importance

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Abstract

An expansion engagement crank assembly for a bicycle. The assembly includes a female crank arm, a male crank arm, and a connector for connecting the female arm and the male arm. The female arm has a shaft sleeve attached at one end, the sleeve having an inboard end, an outboard end, and a bore originating at the inboard end. The bore is bounded by a mating surface and a a fastener surface. The male arm has a shaft attached at one end and the shaft has a radially expandable inboard end and an outboard end. The inboard end of the shaft is sized for insertion within the bore of the sleeve and has a complimentary mating exterior surface for engaging the mating surface bounding the bore. The shaft additionally has an interior coupling surface defining a passage extending through the shaft from the inboard end to the outboard end. The connector is sized for placement within the bore of the sleeve and the passage of the shaft. The connectors also shaped for engaging the fastener surface bounding the bore and for engaging the coupling surface defining the passage to connect the male arm with the female arm. The connector is additionally shaped to radially expand the mating surface of the shaft into an engaged position with the mating surface of the sleeve when the connector connects the male arm and female arm.

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First Claim