Multi-key core lock assembly
US5375444A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 1991 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | May 20, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/765
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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 seco…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.