Railway brake control valve device with continual quick service feature

Claim 1

A RAILWAY CAR FLUID PRESSURE BRAKE APPARATUS OF THE TYPE COMPRISING A NORMALLY CHARGED BRAKE PIPE, QUICK SERVICE VALVE MEANS INCLUDING A MOVABLE ABUTMENT SUBJECT OPPOSINGLY TO BRAKE PIPE PRESSURE ACTING IN A BRAKE PIPE CHAMBER AT ONE SIDE THEREOF AND TO THE PRESSURE IN A QUICK ACTION CHAMBER ON THE OPPOSITE SIDE THEREOF CHARGEABLE THROUGH A RESTRICTED COMMUNICATION FROM SAID BRAKE PIPE, A QUICK SERVICE VOLUME, CONTINUAL QUICK SERVICE VALVE MEANS INCLUDING A MOVABLE ABUTMENT SUBJECT OPPOSINGLY TO AN OPERATING FLUID PRESSURE IN AN OPERATING CHAMBER ON ONE SIDE THEREOF AND TO A BIASING FORCE AND THE PRESSURE ESTABLISHED IN A BALANCING CHAMBER ON THE OPPOSITE SIDE THEREOF, MEANS PROVIDING COMMUNICATION BETWEEN SAID QUICK SERVICE VOLUME AND SAID BALANCING CHAMBER TO CAUSE PRESSURIZATION AND VENTING OF PRESSURE IN SAID BALANCING CHAMBER IN CORRESPONDENCE WITH THAT IN THE QUICK SERVICE VOLUME, SAID QUICK SERVICE VALVE MEANS BEING OPERATIVE RESPONSIVELY TO THE REDUCTION OF BRAKE PIPE PRESSURE IN THE BRAKE PIPE CHAMBER RELATIVE TO THE PRESSURE IN THE QUICK ACTION CHAMBER FROM A NORMAL POSITION TO AN OPERATED POSITION IN WHICH IT SUPPLIES AN OPERATING PRESSURE FROM THE BRAKE PIPE CHAMBER THEREOF TO THE OPERATING CHAMBER OF SAID CONTINUAL QUICK SERVICE VALVE MEANS, THEREBY TO CAUSE OPERATION OF SAID CONTINUAL QUICK SERVICE VALVE MEANS FROM ITS NORMAL POSITION TO AN OPERATED POSITION IN WHICH THERE IS ESTABLISHED COMMUNICATION VIA WHICH FLUID UNDER PRESSURE IS VENTED FROM THE BRAKE PIPE TO SAID QUICK SERVICE VOLUME,