Importance

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Abstract

An operator for hinged windows and being of the kind including a chain which can flex in one direction only and which provides the support whereby the window is held open. Movement of the chain into and out of the operator housing is controlled by a sliding actuator which is moveable along an elongate guide track between two extreme positions corresponding to the window closed and fully opened positions respectively. The actuator can be retained in any selected position between the two extremes by engagement between a spring loaded detent and a toothed rack. The detent is carried by the actuator and the rack is fixed relative to the guide track. Release of the detent is effected by moving a lever connected to the detent against a fixed handle of the actuator and the actuator can be moved along the guide track while the lever and handle are so engaged. When the actuator is in the window closed position, the detent can be moved into a camming and locking recess by separation of the lever and handle and engagement of the detent with that recess causes an associated window to be drawn firmly into the closed position and also positively locks the actuator in the window closed position.

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First Claim