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:
Oct. 04, 2016
Filed:
May. 15, 2015
Northrop Grumman Systems Corporation, Falls Church, VA (US);
Matthew A. Neal, Palmdale, CA (US);
Charles R. Smith, Acton, CA (US);
Northrop Grumman Systems Corporation, Falls Church, VA (US);
Abstract
A fastener for highly curved access panels on aircraft or other structures is disclosed. The fastener features a bottom-grasping design which allows for an unblemished outer panel surface, simple and rapid pneumatic fastener actuation for both latching and unlatching, high reliability, built-in clamping pre-load of the access panel onto the structure, and full retractability of the fastener inside the supporting structure. The fastener includes a Belleville spring with a piston centrally disposed therein, where the piston and spring deflect outward upon application of pneumatic pressure. A pneumatic valve opens upon application of a higher pressure, allowing locking dogs in the piston to deploy radially into a cavity in the access panel. When pressure is removed, the Belleville spring relaxes, the locking dogs grasp a lip of the cavity, and the access panel is latched onto the structure with a clamping pre-load. A pneumatic sequence for unlatching is also provided.