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:
Feb. 15, 2005
Filed:
Dec. 06, 2002
David S. Melberg, Everett, WA (US);
James J. Kunda, Snohomish, WA (US);
David S. Melberg, Everett, WA (US);
James J. Kunda, Snohomish, WA (US);
The Boeing Company, Chicago, IL (US);
Abstract
A self locking fastener system is disclosed for light-weight ballistic resistant applications. The fastener system includes a ballistic resistant cap nut with an integral shoulder. The shoulder is formed onto the mating surface of the cap nut and is keyed to lock with a cut-out in a structural member to which the fastener system is secured. In a commercial aircraft, the cap nut is located on the passenger cabin side of the ballistic resistant flight deck door and prevents tampering therewith that might otherwise lead to disassembly or damage to the fastener system and degrade the ballistic resistance of the door assembly. Thus provided, the fastener system is resistant to removal by manipulation of the cap nut as well as damage from ballistic projectiles. The shoulder of the cap nut increases the shear area of the fastener along the plane of the mating surface thereby enhancing the fastener's resistance to shear loading. The cap nut is constructed of titanium or stainless steel.