Method of fabricating a handlebar stem for a bicycle

Details Method of fabricating a handlebar stem for a bicycle Method of fabricating a handlebar stem for a bicycle

1998-09-15

2000-07-11

Hughes, S. Thomas

Metal working

Method of mechanical manufacture

Shaping one-piece blank by removing material

29557, 72267, 72334, 72356, 72377, B23P 1300, B21C 2318

Patent

active

060854057

ABSTRACT:
A handlebar stem fabrication method includes the steps of (a) selecting a metal ingot subject to the cavity of a first forming die and then operating the first forming die to process the selected metal ingot into an embryonic form having a front end section, (b) operating a second forming die to process the embryonic form into an initially processed form having a middle body section integral with the front end section, (c) operating a third forming die to processing the initially processed form into a secondarily processed form having a hollow rear end with a closed bottom wall and a rear end lug raised from the periphery of the hollow rear end, and (d) processing the secondarily processed form a finished handlebar stem by: cutting the closed bottom wall away from the hollow rear end of the secondarily processed form, making a split at the hollow rear end of the secondarily processed form to separate the rear end lug into two separated lugs, and then drilling two vertically spaced mounting holes at the two separated lugs.

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