Lock deadbolt protector
US4950005A · kind A · utility
34Cited by
11References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Sep 25, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/546
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Mortise lock has a guardbolt which, when depressed, moves a lever inside the lock. The end of the lever moves a vertically sliding interlock slide from a first position in which its fits in a recess in the deadbolt and blocks the throwing of the deadbolt, to a second position. In the second position the slide clears the recess and permits the deadbolt to be extended. This protects against the extension of the deadbolt unless the door is closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.