Screw Jack

A screw jack window mechanism uses a rotating threaded rod (the screw) to push or pull a window open or closed, converting rotary motion to linear motion, ideal for high or hard-to-reach windows like skylights and conservatory roofs, operated by a winding pole or handle, and also acting as a secure lock when shut. They offer mechanical advantage, making heavy windows easy to move, with types including traditional single-rod and modern telescopic versions for extra reach, often in brass or other finishes.