Patent ID: 8407937

Claim:
A door operator for selectively operating a door positioned within a door frame and hinged along one edge to the door frame for movement between a closed position and a fully open position, the door operator comprising: a motor; and an operator arm assembly including: a shaft operatively coupled to the motor, the shaft rotatable in a first direction adapted to open the door and in a second direction adapted to close the door; a rotatable operator arm defining an opening through which the shaft passes and adapted to be operatively connected to the door, wherein the operator arm is adapted to have a closed position coincident with the closed position of the door and a fully open position coincident with the fully open position of the door; and a clutch assembly mounted to the shaft and conditionally operatively engageable with the operator arm, wherein when a force is manually applied to move the operator arm towards the fully open position the shaft and operator arm are not operatively engaged and rotate independently of each other, and when no manual force is applied the shaft and the operator arm are operatively engaged and rotate together.