Drop-bolt door lock assembly
US4688409A · kind A · utility
32Cited by
14References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Jun 6, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/8568
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A high security drop-bolt lock assembly for a door includes a cylinder lock carried by a guard plate positionable on the outside of the door with the cylinder lock within the door, and a drop-bolt assembly on the inside of the door. The drop-bolt assembly is connected to protected studs extending from the guard plate to make a strong unitary construction extremely difficult to defeat and protecting the cylinder lock behind the guard plate and within the door.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.