PURPOSE: To close a window tightly by connecting a motor to a drive output member, and detecting the torque applied to the drive output member with a means of a drive connection part, and stopping the motor with a means to be operated by the detecting means when the torque achieves the predetermined value at the time of closing the window.
CONSTITUTION: When closing a window, in order to obtain the rotation of a drive output member 40 in the reverse direction, a motor 20 is operated so as to drive in the opposite direction, and a chain 96 is moved into a foundation of a housing. When the torque of a chain driving sprocket 95 and the drive output member 40 achieves the predetermined value, the motor 20 is stopped. When a window sash reaches a closing position, the torque is increased immediately by the rotation of the motor 20 for continuously driving the drive output member 40 in the window closing direction.
Stender, Eric C.
Campbell, Frank W.
Alden, Allen J.
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