Security lock for double-hung window
US4824154A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1988 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Feb 10, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/65
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A security lock for a double-hung sash window assembly which is to be mounted on a stile of one of the sash frames to limit movement of the second sash frame relative to the one sash. The lock includes a casing adapted to be mounted within one of the sash frames, a faceplate of the casing having an opening therein communicating with an interior casing cavity. A tumbler pivots in the cavity and is spring biased to normally project through the opening to engage the second sash. A leaf spring is mounted within the casing cavity normally to bias the tumbler into its locking position, but permitting the tumbler to be retracted into the casing. The lock can be supplied as an assembled unit for installation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.