ELEVATOR SHAFT SECURITY APPARATUS Russian patent published in 2015 - IPC B66B5/02 

FIELD: physics, signalling.

SUBSTANCE: apparatus comprises safety circuits (1, 2) for elevator shaft doors and elevator shaft functional switches; an elevator shaft safety control relay (3) having a first coil lead - first control output of the apparatus; a unit (4) for controlling voltage in the safety circuit of the elevator shaft door; a unit (5) for generating a signal for presence of open elevator shaft doors, first (6) and second (7) stepdown transformers connected to the inputs of units (4, 5); first (8) and second (9) electronic switches, the outputs of which are the second and third control outputs of the apparatus; an AC power source (10) for the safety circuit. The safety circuits (1) of the relay coil (11) for controlling the state of the elevator shaft doors are connected in series through switches (12) of the elevator shaft doors to the power source (10). Spark extinguishing RC circuits (13) are connected in parallel to pairs of switches (12) at each floor. When elevator shaft doors are open, the spark extinguishing circuit (13) is connected in series to the power circuit of the relay (11) coil and the relay (11) is triggered. The first group of relay (11) contacts is connected in series to the safety circuit (2). As a result, the relay (3) controls the integrity of the safety circuits (1, 2). The second transformer (7) controls voltage across the relay (11) coil. The transformer (6) generates triggering thresholds for comparison elements (29, 30) in the unit (5) for one and two or more open elevator shaft doors in accordance with variation of the source (10) voltage. Based on the signal from the output of the unit (4), the unit (5) generates signals on the presence of one and two or more doors for switches (8, 9). A duplicate signal for the presence of an open door is generated at the first output of the unit (5). This improves safety of the elevator when the relay (11) fails.

EFFECT: safer elevator operation by providing stable operation of the apparatus during deviation from nominal power supply voltage of the safety circuit, by reducing the probability of false triggering of blocking, enabling control of the performance of switching elements.

3 cl, 1 dwg