Security device for window locks
US4223930A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1979 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Jan 4, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/79
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A security device is provided for installation on double hung windows to prevent the window lock from being jimmied open from the outside and to tighten the windows sashes to the frame as well as to each other when locked. The device is in the form of a generally flat plate or shield that is installed under the window latch and is formed with a pair of fingers which extend across the gap between the upper and lower sashes on either side of the keeper. Reentrant openings are formed from the edge of the shield to allow easy installation and a central portion of reduced thickness introduces a slight tilt to the latch to provide an improved locking grip with the keeper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.