The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1981
Filed:
Oct. 15, 1979
Harding R Hugo, Darien, IL (US);
Danly Machine Corporation, Chicago, IL (US);
Abstract
A supporting assembly providing lateral support for the nib of a punch in a power press having a stripper plate to prevent breaking of the punch when punching thick workpieces. The bushing which conducts the nib of the punch through the stripper plate has a coaxial annular recess in its underside. An annular insert of resilient polymeric material, preferably polyurethane plastic, completely fills the recess and presents an inwardly-directed collar surface substantially aligned with the opening in the bushing. The insert is dimensioned to project downwardly a short distance beyond the punch bushing to provide an exposed striking surface for engaging the workpiece as the ram descends. The reaction force of the springs on the stripper plate is sufficient to volumetrically deform the insert causing the inwardly directed collar surface to crowd against the nib of the punch, thereby providing enhanced lateral support for the punch as the punch penetrates the workpiece. In a preferred embodiment of the invention the striking surface of the insert is beveled in a conical locus.