ELECTROMAGNET LOCK Russian patent published in 2013 - IPC E05B47/02 

FIELD: construction.

SUBSTANCE: electromagnet lock comprises a cylindrical body, in the inner cavity of which there is an electromagnet coil installed. A trap has a central hole consisting of a conical and a cylindrical parts. The outer surface of the trap comprises two parts: the first one, the diameter of which is equal to the inner diameter of the body, and the second one, the diameter of which is less than the inner diameter of the body, forming a cantilever part of the trap, where holes are arranged with balls placed in them. Holes for balls in the cantilever part of the trap are arranged in the form of two parts of different diameter connected with a conical transition. The diameter of holes arranged on the outer surface of the cantilever part of the trap is equal to the diameter of balls, and of those arranged on the inner surface - less than the diameter of the balls. On the cantilever part of the trap there is a fixator. The inner surface of the fixator is made in the form of two parts of different diameter connected with a conical transition. In the central part of the fixator bottom there is a hole, inside of which there is a core made of three parts, a cylindrical core with a flange, a cylindrical core and a cylindrical magnet installed between cores, connecting cores by forces of magnetic gravity. Onto a crossbar and a cylindrical bushing with a flange there is a push spring placed, arranged in the cavity between the inner surface of the protective bushing and the outer surface of the bushing with a flange. In the initial condition, in case of a de-energised electromagnet coil, the spring moves the fixator until stop with the trap, making it possible for the balls to move in holes. When closing doors, the crossbar with a head moves balls apart and contacts with the inner surface of the core flange, and also compresses the spring. At the same time the fixator pushes the balls outside the limits of the trap surface, eliminating the possibility of crossbar movement in reverse direction. In process of further movement the door stops, a force of a permanent magnet developed by a magnetic flow passing along the path: the cylindrical core, the body bottom, the body, the fixator, the core with the flange, becomes sufficient for pulling the core to the body bottom. At the same time the push spring is compressed. The electromagnet lock becomes locked. To open the lock, voltage is supplied to the electromagnet coil. The magnetic flow of the coil demagnetises the magnetic circuit. The fixator moves until stop with the trap, making it possible for the balls to move, which provides an option for the head to exit the trap hole. At the same time the door, under action of the spring, is pushed out of the door opening.

EFFECT: reduced power consumption of a lock.

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