E - Fixed Constructions – 05 – B
Patent
E - Fixed Constructions
05
B
70/37, 292/49
E05B 17/00 (2006.01) E05B 35/12 (2006.01)
Patent
CA 1067932
ABSTRACT OF THE DISCLOSURE A security locking device for dead-bolt door locks which is distinguished by a shroud that encompasses and grips the dead-bolt actuator at the inside of the door, and is rotatably mounted in a base secured to the inner face of the door, with a handle portion on the shroud exposed to enable the shroud - and hence the dead-bolt actuator - to be manually turned. A spring biased security bolt slidably mounted in the base engages a cylindrical side surface of the shroud and snaps into a keeper recess in that surface when the shroud is turned to the position at which the dead-bolt is in its projected door-locking position. A manually rotatable cylinder with an eccentric lug at its inner end to engage one or the other of a pair of opposing shoulders on the security bolt is mounted in the base and operable from inside the door to enable retraction of the security bolt and to select- ively hold the security bolt in either its projected operative position or its retracted inoperative position. A similar security bolt control is provided at the outside of the door, but in this case it is in the form of a key controlled lock cylinder which, in its locked position, holds the security bolt in its projected oper- ative position to prevent unauthorized opening of the door, even from the inside, and when turned from its locked position, retracts the security bolt to free the adjacent exterior dead-bolt actuator for the rotation needed to retract the dead-bolt.
284404
Marsek Richard V.
Morgan Robert H.
LandOfFree
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