Suited for field retrofit on existing machinery, ATD door opener protects operator of automatic machining equipment from crushing and repetitive motion injuries. It automatically reverses when objects are detected in its path. Three sizes are available from stock for horizontal or vertical door orientations. Model 50 has 30 lb pull force and 32 lb-in. drive torque. Model 101, with 56 lb pull force, has 63 lb-in. torque.