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:
Nov. 03, 1998
Filed:
May. 12, 1997
Donald H Kendall, Almont, MI (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
A fastener assembly connects two layers of different hardness in a panel. e assembly has a screw and has a mechanism for boring through the softer layer comprised of a collar of material softer than the material of the screw. The screw is tapped into the collar and has a bit for boring through the harder layer of the panel. The screw's head fits into the collar so that the screw and collar can be countersunk together into the softer layer of the panel. The collar has a lead end having a leading cutting edge for drilling into the softer layer of the panel. The collar also has a trailing end having a frustoconical skirt on which is located a trailing cutting edge. The torque to rotate the screw in the collar is greater than a torque to rotate the collar in the softer layer of the panel. But the torque to rotate the screw in the collar is less than the torque to rotate the screw in the harder layer of the panel.