Railway disk brakes

Claim 1

IN A DISK BRAKE FOR A RAILWAY TRUCK HAVING A WHEELAXLE ASSEMBLY PROVIDED WITH A BRAKE DISK, THE COMBINATION OF: A SUPPORT BRACKET ADAPTED TO BE MOUNTED ON THE TRUCK FRAME AT A POINT SPACED LONGITUDINALLY FROM THE BRAKE DISK; A PAIR OF BRAKE SHOES ADAPTED TO BE DISPOSED ON OPPOSITE SIDES OF SAID BRAKE DISK FOR BRAKING THE BRAKE DISK; A PAIR OF SUBSTANTIALLY PARALLEL, LATERALLY-SPACED, LONGITUDINALLY-EXTENDING SUPPORT ARMS FOR ACTUATING SAID BRAKE SHOES, EACH OF SAID SUPPORT ARMS HAVING ONE END PIVOTALLY CONNECTED TO SAID SUPPORT BRACKET AND HAVING ITS OTHER END PIVOTALLY CONNECTED TO THE ASSOCIATED BRAKE SHOE VIA FIRST PIVOT PIN MEANS; SECOND PIVOT PIN MEANS MOUNTED ON SAID OTHER END OF ONE OF SAID SUPPORT ARMS AT A POINT SPACED LATERALLY FROM THE ASSOCIATED FIRST PIVOT PIN MEANS; AN OPERATING LEVER PIVOTED AT ONE END ON SAID SECOND PIVOT PIN MEANS AND EXTENDING LONGITUDINALLY AND SUBSTANTIALLY PARALLEL TO SAID ONE SUPPORT ARM ON THE SIDE AWAY FROM THE OTHER SUPPORT ARM; A TRANSVERSE PULL LINK PIVOTALLY CONNECTED AT ITS ENDS TO MEDIAL PORTIONS OF SAID OPERATING LEVER AND SAID OTHER SUPPORT ARM WHEREBY MOVEMENT OF SAID OPERATING LEVER MOVES SAID PULL LINK AND SAID SUPPORT ARMS; AND MEANS FOR MOVING SAID OPERATING LEVER COMPRISING A CYLINDER MOUNTED ON SAID ONE SUPPORT ARM ON THE SIDE THEREOF ADJACENT TO SAID OTHER SUPPORT ARM AND BETWEEN SAID PULL LINK AND SAID SUPPORT BRACKET, AND AN OPERATING ROD WHICH EXTENDS THROUGH AN APERTURE IN SAID ONE SUPPORT ARM AND IS PIVOTALLY CONNECTED TO SAID OPERATING LEVER ADJACENT THE OTHER END THEREOF; SAID OPERATING ROD BEING OPERATIVE UPON ACTUATION THEREOF TO MOVE SAID OPERATING LEVER BOTH TO APPLY AND TO RELEASE THE BRAKES, THE AXIS OF SAID CYLINDER AND SAID OPERATING ROD BEING COINCIDENT AND EXTENDING SUBSTANTIALLY PERPENDICULAR TO SAID ONE SUPPORT ARM AND SAID OPERATING LEVER.