LOCK FOR JOINING AND LOCKING OF DOOR WINGS LOCATED ONE BEHIND THE OTHER Russian patent published in 1997 - IPC

FIELD: domestic facilities, in particular, door locking devices, applicable in dwelling houses for reliable closing of the flat having twin entrance doors. SUBSTANCE: the lock case, accommodating the cylinder mechanism with a rotary cylinder, is secured on the outer door. The rotary cylinder is hinge-joined by means of an intermediate clutch sleeve to the set nut freely oriented in the case hole, whose movement is restricted by the bearing flange available on it. The lock mating part is positioned on the inner door and represents the mating part case with the spring-loaded set rod positioned in it. The end of the set rod projecting from the lock mating part case has a screw thread; when the door is closed the end of the set rod under the action of the spring comes in contact with the start of its thread with the start of the thread of the set nut. At a turn of the key the set nut is screwed on the rod. A construction of two doors tightened to each other in the door aperture by a bolted joint is formed that is nondetachable without the aid of the key. EFFECT: enhanced mechanical strength both of the lock proper and of the doors tightened in the door aperture at an attempt of opening of closed doors without the key reduced probability of door opening by a skeleton-key. 7 dwg