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:
Apr. 14, 1998
Filed:
May. 10, 1995
Stephen E Sawdon, Marysville, MI (US);
Edwin G Sawdon, St. Clair, MI (US);
Gregory K Allison, St. Clair, MI (US);
BTM Corporation, Marysville, MI (US);
Abstract
A fastening apparatus includes a spring operable to inwardly bias a pair of die blades toward an anvil. In one aspect of the present invention, the anvil and die blades act in conjunction with a punch to form either an interlocking lanced joint or a contiguous, leakproof, inverted mushroom-shaped joint. In another aspect of the present invention, the anvil has a flat external face. In yet another aspect of the present invention, the spring includes a pair of spring arms joined by a bridge. In still another aspect of the present invention, the spring extends around an external surface of a die body. In a further aspect of the present invention, a discontinuous contact surface of the anvil is provided.