Locking system for a double hung window
US5448857A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Mar 25, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05B65/087
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for selectively securing a window sash to a window frame, including a longitudinally extending jamb liner secured to the frame adjacent one side of the sash, and a movable cam between the frame and the liner for selectively adjusting the spacing therebetween. Frictional locking surfaces are provided between the liner and the sash whereby the cam in a locking configuration biases the liner away from the frame and thereby against the sash to frictionally lock the sash against movement relative to the liner. The liner defines a portion of the track guiding the sash for substantially planar movement and the cam may also be selectively moved to a releasing configuration allowing the liner to sufficiently approach the frame to allow the sash to be cleared from the liner. The cam preferably includes a first set of cam members resiliently secured to the liner at spaced positions along its length, and a second cooperating set of cam members is movable to selectively adjust the overall lateral dimension of the cooperating cam members in the space between the liner and the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.