Accession Number : ADD000143

Title :   Restrictive Manipulation Limited Try Mechanism for a Combination Lock.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Swaim,Frank H

Report Date : 22 Jan 1974

Pagination or Media Count : 7

Abstract : The patent relates to a combination lock having a restrictive manipulation or limited-try feature to prevent the opening of the lock by trial and error manipulation. The mechanism recognizes and counts each unsuccessful attempt at finding the proper code. After a predetermined number of unsuccessful attempts to open the lock, the mechanism renders the lock unopenable, without the knowledge of the illicit manipulator but will continue to accept additional manipulations. A registering device, associated with the mechanism, will reset to permit the opening of the lock by the owner only when the proper code is dialed before the predetermined number of unsuccessful attempts has been reached.

Descriptors :   *Locking fastener devices, *Patents, Security, Mechanical components

Subject Categories : Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE