DOOR HINGE-LOCK Russian patent published in 1997 - IPC

FIELD: locking devices. SUBSTANCE: door hinge has two butts having protrusions with holes which interact with stem. Stem is made lengthened and has protrusion on its end which is of smaller diameter. Made on its end at right angle is bracket. Provided in extension of butt protrusion holes is double-stage cylinder. Diameter of first stage of cylinder is equal to diameter of holes in protrusions and it has slot. First stage of cylinder interacts with slot. Slot is made in upper cover of lock mechanism, and this cover is side extension of butt. Made in ends of slot are side recesses interacting with spring-loaded stem. Inserted into first stage of cylinder is return spiral spring. One end of this spring interacts with end and protrusion of stem, and other end of spring interacts with end and protrusion of piston interacting with second stage of cylinder and spiral spring resting on bottom. EFFECT: high efficiency. 2 cl, 7 dwg