Audible emergency warning signal device for an air brake system

摘要

A warning signal for an air brake system. A diaphragm is mounted in a housing for movement across a cavity in the housing. A main air line of the brake system is connected to the cavity on one side of the diaphragm. Pressure in the line urges the diaphragm against a wall of the cavity. An actuator member is attached to the diaphragm and is urged in a direction to advance the diaphragm to the other wall of the cavity when the pressure in the line falls below a predetermined pressure. A switch which actuates the signal, is connected to the actuator to be actuated when the diaphragm moves across the cavity.