ELECTROMECHANICAL LOCK Russian patent published in 1998 - IPC

FIELD: locking devices. SUBSTANCE: lock has span-piece which is spring-biased in closing direction, electromagnet, rod which is adapted for moving inside body at opening of door by pushing out head-piece of rod from hole of cover plate installed on cheek. Lever which is kinematically connected with rod is made for possible drawing span-piece inside lock body when rod is moving. Armature of electromagnet is made to prevent opening of lock if no permitting signal is given. Dampening spring can transmit movement of rod to lever which is able to prevent pushing of span-piece inside lock under external mechanical action. Slide-member which is spring-biased in closing direction together with pusher and stop is adapted for transmitting movement of rod to lever. Mounted on slide-member is clamp which is made for possible holding of electromagnet armature as clamped to core of electromagnet armature when lock is in closed position. Limit switch is kinematically connected with slide-member for possible operation when slide-member is moving towards opening of lock before slide-member clamp draws electromagnet armature from contact with core of electromagnet armature. Stop on slide-member is adapted to prevent movement of slide-member if electromagnet armature is held clamped to core by magnetic field and also to prevent movement of slide-member if electromagnet armature is not held by magnetic field. Additional limit switch of lever type is adapted for keeping electromagnet armature as clamped to core of electromagnet armature if prior to that armature of electromagnet was held by magnetic field before stop on slide-member came into mechanical contact with electromagnet armature. Aforesaid design of lock is specified by secrecy of its location, convenient operation, and low electric power consumption. EFFECT: higher efficiency. 2 cl, 7 dwg