Derailment detector actuated brake system

Claim 1

A SAFETY DEVICE ADAPTED TO BE CONNECTED TO A BRAKE PIPE OF THE PNEUMATIC BRAKING SYSTEM OF A RAILWAY VEHICLE FOR DETECTING DERAILMENT OF THE VEHICLE AND AUTOMATICALLY CAUSING BRAKING ACTION, SAID DEVICE COMPRISING A HOUSING ADAPTED TO BE CONNECTED WITH THE BRAKE PIPE IN COMMUNICATING RELATION THERETO AND HAVING A VERTICALLY EXTENDING INTERNAL CHAMBER THEREIN, SAID CHAMBER HAVING A VENT PORT LEADING TO THE ATMOSPHERE, INTERCEPTING MEANS FOR NORMALLY PREVENTING COMMUNICATION FROM SAID BRAKE PIPE INTO SAID CHAMBER, A WEIGHT VERTICALLY MOVABLE WITHIN SAID CHAMBER, AND SPRING MEANS FOR URGING SAID WEIGHT TOWARD ONE VERTICAL END OF SAID CHAMBER SO AS TO HOLD THE WEIGHT AT REST UNDER NORMAL RUNNING CONDITION OF THE VEHICLE BUT TO ALLOW THE SAME TO MOVE VERTICALLY BY THE FORCE OF ACCELERATION DUE TO DERAILMENT OF THE VEHICLE AGAINST THE FORCE OF THE SPRING MEANS TOWARD THE OTHER VERTICAL END OF THE CHAMBER, THE RELATION BETWEEN SAID INTERCEPTING MEANS AND SAID WEIGHT BEING SUCH THAT WHEN THE WEIGHT MOVES TOWARD SAID OTHER VERTICAL END OF THE CHAMBER, SAID INTERCEPTING MEANS IS CAUSED TO ALLOW COMMUNICATION FROM SAID BRAKE PIPE INTO SAID CHAMBER, THEREBY VENTING THE PRESSURIZED AIR WITHIN THE BRAKE PIPE INTO THE ATMOSPHERE THROUGH SAID VENT PORT TO CAUSE BRAKING ACTION OF THE BRAKE SYSTEM.