초록 ▼

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 wi

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.

대표청구항 ▼

An operator for a pivoting unit, the unit having a first, pivoted end and a second, rotatable end, the operator comprising: (a) a housing; (b) a rotatable drive member operatively mounted in said housing, said drive member having an axis of rotation; (c) a pair of first arm members having first and

An operator for a pivoting unit, the unit having a first, pivoted end and a second, rotatable end, the operator comprising: (a) a housing; (b) a rotatable drive member operatively mounted in said housing, said drive member having an axis of rotation; (c) a pair of first arm members having first and second ends, said drive member operatively connected to said first arm members proximate said first ends; (d) a pair of second arm members having first and second ends, said first ends of said second arm members operatively connected to said second ends of said first arm members, and said second ends of said second arm members operatively connected to the second, rotatable end of the pivoting unit, wherein a torque from the unit is transmitted to said first and second arm members, wherein the second, rotatable end of the pivoting unit is rotatable from a closed position to an open position, and when the second, rotatable end is in said open position, said first arm members generally define a first plane, and said second arm members generally define a second plane at an oblique angle relative to said first plane; (e) rotating drive means for rotating said drive member; (f) counterbalancing means, operatively connected to said first arm members, for counterbalancing the torque on said first and second arm members, said counterbalancing means creating a force that is transmitted to said first and second arm members; and (g) a pair of linking members that operatively connect said first arm members to said drive member so as to provide an over center advantage as the second, rotatable end of the pivoting unit is rotated to said closed position.