Patent ID: 8844200
Filing Date: 2014-09-30
Classification: E05F,E05Y

Abstract:
1. A door operator for a door comprising: a motor moving an arm to move the door between a closed position and an open position and between the open position and the closed position; a current sensor generating a current signal corresponding to a current to the motor; a position sensor in communication with the arm generating a position signal corresponding to the position of the door relative to a frame; a controller communicating with the current sensor, the position sensor and the motor, said controller controls the current to the motor in response to the current signal and the position signal so that door movement speed is below a limit speed and a corresponding closing force is below a predetermined force, and a gear set, and a belt in communication with the motor and the gear set, said gear set operating the door arm in response to movement of the belt, wherein the gear set comprises planetary gears, and said door operator is springless.