SAFETY DEVICE REQUIRING PERIODIC ATTENTION OF VEHICLE OPERATORS

摘要

The control penalty solenoid of an air brake system is maintained energized during a first timing cycle of a control circuit and during a second timing cycle of a time delay relay through which the control circuit and solenoid are energized from a voltage source. Completion of the first timing cycle initiates the second timing cycle during which a warning device alerts the operator. Normal actuation of a reset switch by the operator before completion of the second timing cycle, prevents the energization of the solenoid.