Importance

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Abstract

A handlebar formed from a metal hollow pipe and having a generally uniform peripheral wall thickness along its entire length, including a longitudinal center portion, first and second end portions having a smaller outer diameter than that of the longitudinal center portion, and first and second, tapered intermediate portions connecting the center portion to the first and second end portions, respectively. The first and second, tapered intermediate portions and/or the first and second end portions are bent symmetrically with respect to the longitudinal center portion. The handlebar is produced by bending a hollow straight metal pipe, placing the resulting bent pipe between molds and feeding a pressurized liquid into the bent pipe while axially compressing the bent pipe to cause the peripheral wall of the bent pipe to plastically expand into conformity with a mold cavity defined by the molds.

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First Claim