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:
Sep. 07, 1976
Filed:
Jan. 08, 1975
Dwight W Glass, Rockford, IL (US);
Keystone Consolidated Industries, Inc., Peoria, IL (US);
Abstract
A lock construction for a safe deposit box requires two keys for operation of the bolt. The first key is provided by the vault guard and the second key is provided by the customer. Each key activates a separate set of wafer-like tumblers by rotating the tumblers in response to rotation of the key. Each set of tumblers includes a plurality of key engaging drive tumblers which are gear engaged with gate tumblers. Appropriate rotation of the keys orients a notch of the gate tumblers that permits withdrawal of the bolt. Stops are provided on the bolt cooperative with key operated shifters to insure sequential operation of the keys. A change key tool may be inserted from the back side of the lock to disengage the drive and gate tumblers. Subsequent to disengagement of the tumblers, it is possible to substitute one or both of the keys and thus change the relative gear engagement of the tumblers. Unique features of the security lock include the tumbler drive mechanism, the key combination change mechanism and the stop arrangement that insures sequential operation of the keys.