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US 6,178,631 B2Granted
Method of heating and quenching a hollow metal member
AssigneeShimano Inc.
InventorsShin Tanabe, Daisuke Sugimura
Life of this patent
Estimating the term…
Abstract
A method of manufacturing a metal member includes the steps of forming a metal body having a hollow core, wherein a side of the metal body defines a core opening exposing the hollow core; placing a filament through the core opening into the hollow core; closing the core opening around the filament; and heating the metal body so that the filament disintegrates to form a filament hole sufficient to allow gas within the hollow core to escape through the filament hole.
Claims16
A method of manufacturing a metal member comprising the steps of:
- forming a metal body having a hollow core, wherein a side of the metal body defines a core opening exposing the hollow core;
- placing a filament through the core opening into the hollow core without completely filling the hollow core;
- closing the core opening around the filament;
- and
- heating the metal body so that the filament disintegrates to form a filament hole sufficient to allow gas within the hollow core to escape through the filament hole to thereby prevent deformation of the metal body.
2 more elements
A method of manufacturing a metal bicycle crank arm comprising the steps of:
- forming a crank arm body having a hollow core, wherein a side of the crank arm body defines a core opening exposing the hollow core;
- placing a filament through the core opening into the hollow core;
- closing the core opening around the filament;
- and
- heating the crank arm body so that the filament disintegrates to form a filament hole sufficient to allow gas within the hollow core to escape through the filament hole.
2 more elements
Dependencies are inferred from the claim text.