COMPACT WINDOW OPERATOR

摘要

13 A counterbalanced window operator includes a housing (11) in which operating arms (7,8) pivotally connected in the housing and slidingly and pivotally connected to a sash of the window are counterbalanced by a torsion spring (13). In one embodiment, connections between the torsion spring and the operating arms are adjustable in order to vary the counterbalancing force applied to the operating arms.