Andersen Corporation

Jurgen R Martens

James Curtis Guhl

Hartmut Ginnow-Merkert

Harald Tomanek

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.

Growing community of inventors

Leinfelden-Echterdingen, Germany

Jurgen R Martens