A LIFTING DEVICE FOR A ROOF WINDOW

摘要

A lifting device (1) for a top hung roof window, said device comprising a lifting arm (2) having a first end (3) connectable to a sash or frame element of said window, and a second end (4) pivotally connected to a slide block (5) adapted for slidable engagement with an opposite frame or sash element, the slide block (5) being in turn connected to a primary biasing means (6) arranged to urge the slide block (5) in a first direction. To provide a lifting device, which can provide a large opening to a roof window for rescue purposes, the lifting arm (2) is extendable and comprises a secondary biasing means (7) urging to extend the lifting arm (2).