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:
Dec. 27, 1994
Filed:
May. 20, 1991
Jerry R Smith, Littleton, CO (US);
Shield Security Systems, Inc., Englewood, CO (US);
Abstract
A core lock assembly which is operable by two differently bitted keys is disclosed. The core lock assembly includes a shell defining a hollow portion for receiving a core which is capable of rotating to a first position under the control of a first key and to a second position under the control of a second, differently bitted key. The core lock assembly also includes a core rotation mechanism housed in the core for changing from a locked state to a first core rotatable state when the core rotation mechanism is engaged by the first key and for changing from the locked state to a second core rotatable state when the core rotation mechanism is engaged by the second key. The inner surface of the shell defines locking, first and second surface areas for cooperating with the core rotation mechanism. The locking surface area cooperates with the core rotation mechanism to enable a key engaging the core rotation mechanism to be removed from the core, the removal of which returns the core rotation mechanism to its locked state. The first surface area cooperates with the core rotation mechanism to permit the core to be rotated to the first position under the control of the first key. The second surface area cooperates with the core rotation mechanism to permit the core to be rotated to the second position under the control of the second key.