Latch and lock guard
US4390199A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Apr 24, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/79
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A latch and lock guard for doors which comprises a pair of similar elongated bars of sufficient width and thickness for purposes of rigidity. Each bar has a flat base and a series of uniform, regularly spaced teeth extending integrally from the bar sideways along one edge. The width of the spaces between the teeth is slightly greater than the width of the teeth. Means are provided to secure solidly one bar to the external side of a door over the lock area, with its teeth pointing towards the adjacent door edge, and to secure solidly the other bar to the door jamb with its teeth pointing towards the door edge, the teeth of one bar fitting within the slots between the teeth of the other, and vice versa, in interlocking fashion when the door is in closed position. Such a latch and lock guard provides a very strong, but simple and easily installed device for protecting a door against jimmying in a direct face attack, for example, through use of a credit card or sharp pointed device, or in a vertical attack by prying the door from underneath or above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.