COMBINED ELECTROMAGNETIC LOCK Russian patent published in 2003 - IPC

FIELD: equipment for residential apartment houses and production buildings, systems limiting access. SUBSTANCE: in electromagnetic locks there are used opposite electromagnetic fields for door braking and electromagnetic fields coinciding in direction to create increased holding force at moment of attempt of unauthorized opening of door. Combined electromagnetic lock includes two electromagnets with two windings, control module and power supply unit. Control module comprises microcontroller with control input connected to N-sectional switch, where N is number of sections of switch, to door sensor, to first and second controller-supply switch with first and second ionistor batteries. EFFECT: enhanced effort of break, reduced acoustic noise, additional growth of break effort when unauthorized opening of lock is attempted. 4 cl, 1 dwg