Window operator

A window operator comprising:

• a rotatable drive output member;
• a selectively operable motor;
• a speed-reducing gear train between said drive input and drive output members;
• a clutch in said gear train including a pair of separable clutch members;
• means yieldably-holding said clutch members against said separating movement;
• a torque-responsive coacting means on the clutch members for causing progressive increase in the separation of the clutch members against the action of the yieldable holding means in a direction representative of only closing the window as the torque applied to the output member increases above a certain amount;
• a motor-controlling switch positioned in the path of one of the clutch members;
• and
• means for adjustably positioning said switch whereby the amount of said torque effective to operate the switch can be set at a predetermined value.

A window operator for moving a window component between fully open and closed positions and any desired position therebetween comprising;

• a rotatable drive output member;
• a rotatable drive input member;
• a gear train between said drive input and drive output members;
• means for rotating said drive input member;
• a switch for controlling operation of said rotating means;
• and
• means responsive to a closing torque applied to the rotatable drive output member in excess of a predetermined value for operating said switch to deenergize said rotating means, said responsive means including a clutch having a pair of clutch members urged toward each other by spring means, and anti-backdrive means adapted to prevent rotation of the clutch members and gear train in response to an externally-applied window component opening force.