Methods for making a bicycle frame part having a...

Details Methods for making a bicycle frame part having a... Methods for making a bicycle frame part having a...

2006-11-28

2006-11-28

Banks, Derris H. (Department: 3725)

Metal deforming

Process

Tube making or reshaping

C072S370010, C072S370140

Reexamination Certificate

active

07140226

ABSTRACT:
A bicycle frame part having a disproportionally enlarged end section and a method for making the same. The method may include disproportionally enlarging an end section of an aluminum alloy tube of a bicycle frame part includes the steps of (a) drawing the tube to form a thin section and a thick end section, (b) radially and proportionally enlarging the cross-section of the thick end section of the tube by forging the tube in such a manner that the wall thickness of the thick end section after being enlarged is substantially the same as that of the thin section, and (c) disproportionally varying the cross-section of the thick end section of the tube by forging the tube obtained in step (b).

REFERENCES:
patent: 2739376 (1956-03-01), Peet
patent: 4301672 (1981-11-01), Simon
patent: 5671626 (1997-09-01), Lonbani
patent: 5832766 (1998-11-01), Hartman et al.
patent: 6453714 (2002-09-01), Kido et al.
patent: 6581433 (2003-06-01), Otsuka et al.
patent: 6826943 (2004-12-01), Rempe et al.
patent: 6845552 (2005-01-01), Blough
patent: 2002/0043089 (2002-04-01), Reiche et al.

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