DEVICE FOR CHECKING POSITION OF TONGUES RELATIVE TO GUIDE RAILS OF SWITCH Russian patent published in 2004 - IPC

FIELD: railway transport. SUBSTANCE: invention relates to automatic control devices of railway transport to be used to control operation of track switches. Proposed device contains, in addition to main tongue contacting position pickups, lagging tongue position pickups located on foundation attachment angle of switch electric drive under tongue feet and connected similar to connection of main tongue contacting position pickups. Circuits to compare control pulses with reference pulse in pulse length in pairs from contacting and lagging tongue position pickups are connected to AND circuits and through "EXCLUDING OR" circuit, to actuating relay which controls opening of switch circuit. EFFECT: provision of correct information as to position of torque relative to guide rails. 2 cl, 2 dwg