Double changeable key lock for safe deposit boxes and the like
US3983728A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1974 |
| Grant date | Oct 5, 1976 |
| Priority date | — |
| Expiry date | Oct 23, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7734
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.