Method for manufacturing cranks for bicycles

Details Method for manufacturing cranks for bicycles Method for manufacturing cranks for bicycles

1997-12-12

1998-12-22

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 464, 264161, 264232, B29C 4406, B29C 4412

Patent

active

058514597

ABSTRACT:
A method is illustrated for manufacturing bicycle cranks in which a layer of foamable material is applied on an outer surface of a metallic member which has two holes respectively defined in two ends thereof. A layer of composite preimpregnated material is then applied on the layer of foamable material. Thereafter, the metallic member is mounted in a mold and then heated to make the foamable material foam, thereby achieving formation of a semi-product crank by means of formation of the foamable material, the composite preimpregnated material, and the metallic member. After removal from the mold, the holes of the semi-product crank is tapped, and the semi-product crank is then trimmed and ground. Patching is applied to make an outer surface of the crank smooth.

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patent: 5152856 (1992-10-01), Thein et al.
patent: 5316709 (1994-05-01), Ko et al.
patent: 5435869 (1995-07-01), Christensen
patent: 5632940 (1997-05-01), Whatley

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