Indicator system for a door with sliding bolt lock
US4717909A · kind A · utility
27Cited by
5References
8Claims
0Family size
Inventor
Key dates
| Filing date | Aug 23, 1985 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Aug 23, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S292/65
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A housing is mounted interiorly of a door frame member and houses first and second switch members which move simultaneously in response to entry of a lock bolt end into a strike plate opening. A switch on the housing is in circuit with an indicating unit having illuminated door open and door locked signals and a power source. The first and second switch members are in sliding contact with one another and are displaced laterally away from the lock bolt as it moves to a door locking position. A projection on the first switch member is normally disposed in the strike plate opener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.