Method of making a two-piece capped lug nut
OwnerShigeru Omoriinventor
Life of this patent
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Abstract
A production method for a two-piece capped lug nut which consists of a nut and cap which is attached to the top. The top of the nut has a grooved, serrated or roughened surface and a protrusion for positioning. When the cap is positioned on the nut, the cap is correctly centered by the protrusion and at the same time, the flange portion of the cap is positioned over the grooved, serrated or roughened surface. Then the nut and the cap are welded under pressure together by running electrical current through them.
Claims6
A process for making a two-piece capped nut from a nut having a horizontal top surface and a cap having a bottom edge, which comprises the steps of:
- (a) forming serrations on said horizontal top surface of the nut to be capped;
- (b) forming a centering projection on said top surface of said nut;
- (c) assembling said cap to said nut, said cap having a bottom opening complementary to said centering projection of said nut, to center said cap onto said nut, the bottom edge of said cap resting on said serrated top surface of said nut;
- and
- (d) welding said cap onto said nut, under pressure along the adjacent bottom edge of said cap and said serrated top surface of said nut, whereby molten metal produced during the welding operation flows only into the serrations of said top surface to create a relatively strong weld.
Dependencies are inferred from the claim text.