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:
Aug. 27, 1991
Filed:
Jul. 26, 1989
Thomas H Speller, Sr, Buffalo, NY (US);
Gencor Engineering Corp., Buffalo, NY (US);
Abstract
A method for dimpling and riveting a workpiece wherein the workpiece is clamped, the dimpling, drilling and riveting are performed sequentially while the workpiece is clamped, and the workpiece is heated prior to dimpling. During clamping a pressure foot force is applied to one side of the workpiece, and during dimpling a force is applied to the opposite side causing movement of the workpiece a small distance and against the pressure foot force. The dimpled recess in the workpiece is in the general shape of a truncated cone, and the drilling provides a rivet-receiving hole through the workpiece in the recess. When it is desired to provide a fluid-tight seal, the minor diameter of the truncated cone is made slightly greater than the diameter of the rivet-receiving hole thereby providing an annular step or ledge extending between the hole and the outwardly diverging wall of the dimpled recess. During upsetting of the rivet there is a radial compression of the workpiece material in the region of the annular step to provide a fluid-tight seal between the rivet and the workpiece.