Process for producing a bicycle frame made of fiber-reinforced p

Details Process for producing a bicycle frame made of fiber-reinforced p Process for producing a bicycle frame made of fiber-reinforced p

1990-06-18

1992-06-16

Heitbrink, Jill L.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 79, 156245, 156294, B29C 4100

Patent

active

051222108

ABSTRACT:
A process for producing a bicycle frame of a fiber-reinforced plastics (FRP) including the steps of: forming parts of a bicycle frame such as an upper pipe, a lower pipe, a vertical pipe, a chain stay and a rear fork, or a combination thereof, with an FRP; arranging the bicycle frame parts in a structure of the bicycle frame; forming, with an FRP, lug portions onto the arranged bicycle frame parts at a required position whereat the bicycle frame parts are to be connected and fixed to each other; and curing all of the lug portions at one time, to thereby simultaneously accomplish an assembling of the bicycle frame. A process for forming a lug portion of a FRP bicycle is disclosed which includes the steps of: providing a female mold with a cavity having a shape of a final lug portion; disposing a flexible sheet on a surface of the cavity; arranging frame parts in a structure of a bicycle frame; arranging the female mold at a lug portion of the arranged bicycle frame parts; supplying and foaming a foaming material in the female mold at the lug portion; removing the female mold to leave an assembly of the frame parts with a foamed body; removing the flexible sheet from the female mold; laminating a foaming sheet and then a prepreg of resin-impregnated continuous fibers onto the foamed body; arranging the female mold over the laminated prepreg; and heating to cure the resin while foaming the foaming sheet, to thereby form the lug portion of the FRP bicycle frame.

REFERENCES:
patent: 3833242 (1974-09-01), Thompson, Jr.
patent: 4231825 (1980-11-01), Carter
patent: 4437257 (1984-03-01), Kluge
patent: 4474635 (1984-10-01), Adams
patent: 4541649 (1985-09-01), Grunfeld
patent: 4657795 (1987-04-01), Foret
patent: 4850607 (1989-07-01), Trimble

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