DEVICE FOR LOCKING A DOOR Russian patent published in 1996 - IPC

FIELD: civil engineering. SUBSTANCE: device has spring drive that includes casing, rod and compression spring. The rod is provided with a roller, and the device is provided with guide member made in the form of bow of inconstant curvature radius and installed on door frame so as to interact with the roller. Spring drive is secured rigidly to door leaf with its casing that allows the door to be moved up to the limit specified only by the angle of guide member opening. Spring drive breaking away is excluded since the force responds in door plane and is taken by spring drive casing. EFFECT: higher reliability. 2 cl, 3 dwg