Window sash counterbalance with varying lift

Details Window sash counterbalance with varying lift Window sash counterbalance with varying lift

E - Fixed Constructions

05

F

E05F 3/18 (2006.01) E05C 17/00 (2006.01) E05D 15/16 (2006.01) E05F 1/00 (2006.01)

Patent

CA 2106557

- 19 - TITLE WINDOW SASH COUNTERBALANCE WITH VARYING LIFT ABSTRACT A counterbalance for a window sash (28) includes a torsion spring (10), a follower nut (20), and a spiral rod (22) threadably engaged with the follower nut (20). The spiral rod (22) has a pitch that is varied along one part of its length to produce a substantially constant lifting force throughout most of a range of sash travel between a lowered position and an intermediate position. However, the pitch is further varied along another part of the length of the spiral member to produce a larger lifting force within a remaining portion of the range of sash travel from the intermediate position to the raised position.

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