A restrictor device for hinged windows, where the extent to which the window can be opened is restricted

摘要

A restrictor device for hinged windows allows the window to move between a closed position to a first open position, where the extent to which the window can be opened is restricted, and a second open position where the window can be opened all the way. The device has an arm 11 that is pivotally mounted to a) a frame mounting plate 16 and b) to a second arm 12 that is releaseably engaged with a pin 23 mounted to a locking bar of a multipoint locking arrangement. Due to a switch incorporated into the handle, the locking bar can only move the pin 23 to a position 23''. Thus as the window sash is opened the arms 11 and 12 extend to form a restrictor. However, if the switch is released to enable the locking bar to move further, the pin can move to position 23' whereupon the pin 23 releases from slot 21 through gap 22 so that the restricting arms 11 and 12 disengage the pin and the window can fully open.