EXTERNAL CONTROL UNIT OF DOOR OPENING WITH LOCK WHICH OPENS ONLY FROM INSIDE Russian patent published in 1999 - IPC

FIELD: locking devices. SUBSTANCE: control unit has combination cylinder which is installed at front side of external unit. It can longitudinally slide relative to stationary supporting base. Base is provided with detent which in working position of combination cylinder is turned along axis towards mating lateral space of stationary body of combination cylinder. Detent can occupy respectively position of interlocking and releasing of combination cylinder depending on tensioning or stretching of spring connected to detent. Detent has tapered tail-piece which along axis is directed along slot in supporting base, and radially it is turned towards threaded hole which can be reached only from back side of external unit. Located in threaded hole is pin which is provided with tapered end adding to tapering of tapered tail-piece. Pin can occupy respectively passive or active position when its tapered end is either countersunk in threaded hole or enters slot and is pressed by sliding against side portion of tapered tail-piece at maximal penetration at which detent occupies position of interlocking of combination cylinder. Aforesaid embodiment of external unit makes easier mounting of combination cylinder which allows for its simple and quick replacement if necessary. EFFECT: higher efficiency. 4 cl, 19 dwg