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US Patent: 5,011,324
Detent Structure Having a Retaining Lip with a Smooth Continuous Outer Surface Free from Stress-Concentrating Corners
Gordon A. Putney - Lake Geneva, WI

USPTO Classifications:
29/441.1, 403/328

Tool Categories:

Snap-On Tools Corp. - Kenosha, WI

Not known to have been produced

none listed

Patent Dates:
Applied: May 14, 1990
Granted: Apr. 30, 1991

Patent Pictures:
USPTO pdf tiff
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Snap-On Tools Company History
Emrich & Dithmar - patent attorneys


A detent ball is retained in a recess against a bias spring by deforming the material around the open end of the recess radially and axially inwardly of the recess to define a retaining lip to hold the ball in place, the lip having a substantially part-spherical outer surface. The deformation is accomplished by an embossing tool having a part-spherical embossing surface which converges from an end wider than the recess to an end narrower than the recess. A part-spherical cavity in the end of the embossing tool accommodates the ball during the deformation process.

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