Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...
Reexamination Certificate
2007-02-27
2007-02-27
Compton, Eric (Department: 3726)
Metal working
Method of mechanical manufacture
Combined manufacture including applying or shaping of fluent...
C029S897200, C029S888080, C074S594100, C072S356000
Reexamination Certificate
active
10658243
ABSTRACT:
A method for manufacturing a crank arm and spider assembly includes the following steps: (1) providing a blank; (2) shaping the blank to form a crank billet comprising an elongate body having a first end on which a spider is integrally formed and an opposite end having an expanded outside diameter; (3) forming a channel substantially co-extensive with the elongate body with an opening at the second end of the body; (4) reducing the expanded second end and thereby reducing inside diameter of the channel in proximity of the second for forming an entry of the channel; (5) filling a liquid into the channel through the entry and then sealing the entry; (6) placing the crank billet with the liquid filled in the channel into a mold and performing a mold forging operation to obtain a semi-product; and (7) forming a hole in the body to release the filling liquid out of the channel of the crank. Also disclosed is a one-piece bicycle crank arm and spider assembly comprised of an elongate crank body in which a channel is formed, the crank body having a first end on which a spider is integrally formed as one piece and an opposite second end defining a hole.
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