Double cylinder lock with key retention
US4228669A · kind A · utility
22Cited by
9References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1978 |
| Grant date | Oct 21, 1980 |
| Priority date | — |
| Expiry date | Jul 3, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7768
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A double cylinder lock constructed with a single tailpiece driver and a clutch. The interior lock key can be extracted only when the lock bolt is retracted and not when the lock bolt is extended. The driver and clutch arrangement prevent either cylinder from becoming out of time, regardless of which cylinder is used to throw the bolt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.