Bit key lock
US4009600A · kind A · utility
0Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1975 |
| Grant date | Mar 1, 1977 |
| Priority date | — |
| Expiry date | Aug 29, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7881
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bit key lock is improved by the provision of at least one deadplate fixedly position nonsymmetrically with respect to the lock between tumblers so as to interfere with the turning of any key not allowing for the presence of the deadplate. By reason of the nonsymmetrical positioning of the deadplate, different keys are required to actuate the lock from opposite sides. A master key may be provided by allowing for the alternate position of the deadplate relative to the opposite sides of the lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.