Title: Double changeable key lock for safe deposit boxes and the like

Abstract: A changeable combination key lock for safe deposit boxes and the like, wherein a guard key is insertable into a rotatable guard key plug to set guard key tumblers to permit retracting movement of a bolt, and a renter's key is insertable into a rotatable renter's key plug for engagement with renter's key tumblers to aline them to permit retraction of the bolt. Both the renter's key tumblers and the guard key tumblers are releasable from gate members carried by the bolt and may be set for key configuration for a new renter's key and a new guard key, or either of them, when the lock is conditioned in a change mode to permit adjustment of the lock to operate with different guard keys and renter's keys.

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Other info:

Inventors: Phillips, Peter J. (Redando Beach, CA, US)

Application Number: 517399
Filing Date: 1974-10-23
Publication_date: 1976-10-05
Assignee: Sargent & Greenleaf, Inc. (Rochester, NY)
Primary Class(es): 70/339 70/383
Other Classes:
US Patent Ref:

690537	Jan, 1902	Taylor	70/384.
1125343	Jan, 1915	Klohs	70/339.
1259353	Mar, 1918	Brintnall	70/384.
1384179	Jul, 1921	Christoph	70/364.
1522573	Jan, 1925	Benham	70/339.
1693731	Dec, 1928	Sioberg	70/383.
1826595	Oct, 1931	Benham	70/339.
2221664	Nov, 1940	Susser	70/384.
2832211	Apr, 1958	Saarento	70/377.
3514982	Jun, 1970	Bergendahl	70/384.
3772904	Nov, 1973	Parrock	70/383.
3837196	Sep, 1974	Gartner et al.	70/383.

Other Refs:
Primary Examiner: Frazier, Roy D.
Assistant Examiner: Holko, Thomas J.
Attorney: Mason, Fenwick & Lawrence