Counterbalanced window operators

Details Counterbalanced window operators Counterbalanced window operators

1991-11-27

1993-04-27

Kannan, Philip C.

Movable or removable closures

With means mounting closure for swinging

With biasing means

49324, 74 8914, 267175, E05F 110, E05F 1100

Patent

active

052050742

ABSTRACT:
A counterbalanced window operator includes a rotatable drive member operatively connected to the pivoting end of the window by means of an arm member (29). A spring (40) occupying a fixed orientation is operatively connected to the arm member (29) to counterbalance the torque transmitted from the window to the arm member (29). In a preferred embodiment, double scissors arm members (250a and 250b) include a pair of first arm members (251a and 251b) that define a first plane and a pair of second arm members (252a and 252b) that define a second plane at an oblique angle relative to the first plane when the window is in an open position.

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