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:
Jul. 26, 1983
Filed:
Feb. 23, 1981
James A Swisher, Southport, CT (US);
Other;
Abstract
A lock of the type having an elongated housing open at the rear end with internal operating mechanism to release locking means, in which the mechanism comprises a collar which is spring biased forwardly and a locking stem mounted in the collar and spring biased rearwardly in relation thereto. The insertion of an operating tool causes movement of the stem forwardly a predetermined amount, allowing the tool to engage the collar. However, the insertion of a picking tool into the collar forces the stem forwardly in relation to the collar, a greater distance increasing the overall length of the mechanism to an extent that even when the collar is moved rearwardly as far as possible, the forward end of the stem does not move rearwardly far enough to release the locking means. In one embodiment of the invention, the end of the stem protrudes far enough that operating tools normally used for this type of lock cannot be used to open the lock.