| 摘要 |
A sash window restrictor (20) has a housing (22) which is to be let into a vertical frame member (10) of one sash (normally the upper, outer sash) of a window, at a position, say, 10 cm above the top rail of the lower sash when the windows are closed. A tab (24) is mounted in the housing and can be retracted into the housing or extended from the housing. A mechanism acts between the tab and the housing and allows the tab to be pressed into the housing and held in the housing for a period of time before the tab is released to allow the tab to extend. With the tab extended, the lower sash (12) can be lifted until it reaches the tab (24) but no further, so that a 10 cm gap will be opened at the bottom of the window. |
| 主权项 |
1. A sash restrictor for restricting the movement of a sash comprising a housing, a tab which is retractable into the housing and extendable from the housing, and a mechanism acting between the tab and the housing which allows the tab to be pressed into the housing and which holds the tab in the housing, the mechanism comprising latching means for latching the tab in a retracted position wherein the latching means requires an actuation in order to release the tab and to allow the tab to extend from the housing and wherein the actuation comprises a contact force generated, in use, by contact between the sash and the tab caused by movement of the sash relative to the sash restrictor. |
