Locking arrangement with burglar alarm
US4029919A · kind A · utility
7Cited by
1References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1976 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Jan 21, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S70/49
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A cylinder lock is provided with a contact carrier for the movable contact of a switch in an electrically operated burglar alarm. A spring mounted on the contact carrier and radially projecting from the casing of the lock is stressed by engagement with the wall of the door aperture receiving the lock and biases the contact carrier toward a switch opening position. When it is attempted to pull the lock from the door, the spring pivots the contact carrier and the alarm is energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.