Abstract: The device includes an electromagnet, a bracket for holding the electromagnet in a door frame to force the opening therein, an electrical conduit for connecting the electromagnet to a power source, an armature magnetically attracted to the electromagnet when the latter is energized, a connector for holding the armature on a door edge in the frame for adjustable movement towards the electromagnet and a lock component for the device. The lock component comprises one or more ledges at the periphery of the electromagnet and/or armature pair projecting towards and engageable with the other(s) of the pair when the armature is magnetically attracted to the energized electromagnet. This occurs when the armature and electromagnetic are in line with each other, the armature being free to move toward the electromagnet. Unlocking is effected by deenergizing the electromagnet and allowing the armature to retract by gravity or spring action, so that the lock component also moves out of the descirbed engagement.

Abstract: The assembly includes a door with rotatable door handle connected thereto, and a primary door locking mechanism. The door is hinged for opening and closing in a frame disposed in an entry way. The door includes a handle hub lock having a hub locking plate around the handle hub, a protrusion extending from the locking plate, a bolt member having a recess adapted to receive the protrusion, a bolt biasing mechanism, and a biasing force reversal mechanism for causing the bolt member to move in a direction opposite to the direction in which the bolt biasing member moves. The biasing mechanism preferably includes a plunger extending from the leading door edge toward the door jamb and biasable thereby, during door closing, against the bolt to move it into the locked position, and a spring connected to each of the plunger and bolt member. In one embodiment, magnets magnetically bias the slide bolt member to the desired locked or unlocked position.

Abstract: An improved door locking and monitoring assembly is provided which is power activated. The assembly comprises a housing disposable in a door frame and defining a passageway which has a bolt slidably disposed therein and lockset means in the door member. A lever is pivoted in the housing. The lever is L-shaped, with a spring biased vertical arm below it. The rear of the latter is urgeable upwardly by a ball to pivot the lever and move the bolt forward into the locked position. The ball is urgeable upwardly by a solenoid actuated plunger. The biased L-shaped arm has the arms thereof pivoted allowing relative angular movement. An extension on one of the arms is forced into an opening in the housing when the bolt is fully extended to lock-set the bolt. When the bolt moves into the locked position, a member on its rear end closes a powered switch to signal this condition.

Abstract: The assembly includes a door with rotatable door handle connected thereto, and a primary locking mechanism on a door hinged for opening and closing in a frame disposed in an entry way. The door includes a handle hub lock mechanism, including an actuator connected to a biasing force reversal mechanism for causing locking of the handle in a given position. The biasing mechanism preferably includes an actuator extendible from the leading door edge towards and alternatively into a recess in the door jamb. A lost-motion mechanism interconnects the actuator and the force reversal mechanism. The actuator normally extends outwardly from the door edge a significantly greater distance than the distance between the strike plate and the door edge.

Abstract: The assembly includes a door with rotatable door handle connected thereto, and a primary door locking mechanism. The door is hinged for opening and closing in a frame disposed in an entry way. The door includes a handle hub lock having a hub locking plate around the handle hub, an elongated slide bolt supported to movement into and out of a recess in the locking plate and a bolt biasing mechanism. That biasing mechanism preferably includes a plunger extending from the leading door edge toward the door jamb and biasable thereby, during door closing, against the bolt to move it into the locked position, and one or more springs connected to the plunger. In one embodiment, one or more electromagnets selectively magnetically bias the slide bolt to the desired locked or unlocked position. The assembly is simple and effective.

Abstract: The system automatically warns when opening of an exit door is attempted, causing an alarm to be made and preventing full opening for a predetermined period of time. Such a system includes an electromagnet, timer, alarm and activator switch connected in series with a power source such as house current and disposed in and around the frame with no electrical connection to or from the door. A magnetically attractable plate or prong is secured to the door adjacent to the electromagnet. The switch may include a spring biased plunger on the frame, held in the closed circuit position against the spring bias with the door closed. The switch automatically moves to the closed circuit position when the door begins to open, causing an alarm to be immediately sounded and the plate to continue to be strongly held by the electromagnet, thereby preventing full opening of the door. The system permits the full opening of the exit door only after a suitable period of time has elapsed.

Abstract: An improved door locking and monitoring assembly is provided which is power activated. The assembly comprises a lock assembly in a housing, which housing is disposed in a door. The lock assembly has a latch trip member extending therefrom along with an ordinary latch. An actuating and switching assembly is disposed in a housing located in the door frame, including a power activated bolt located opposite from and adapted to displace the trip member, and a switch located opposite the latch and adapted to signal the relative position of the latch. The lock assembly has a series of inter-acting, pivoted arms which co-act in a manner to prevent rotation of the door-knob hub while locking the latch in an extended position, all upon actuation of the bolt to displace the trip member into the lock assembly. Signalling means are employed to indicate the state of the lock assembly.