Air brake cylinder with a built-in automatic brake slack adjuster

Claim 1

AN AIR BRAKE CYLINDER WITH A BUILT-IN AUTOMATIC BRAKE SLACK ADJUSTER, COMPRISING, IN COMBINATION, A CYLINDER BODY, A CYLINDER FRONT HEAD DIVIDED INTO TWO PARTS OF WHICH THE FIRST IS ROTATABLE ABOUT THE AXIS OF THE CYLINDER IN RELATION TO THE SECOND WHICH IS NON-ROTATABLY SECURED TO SAID CYLINDER BODY, A BRAKE PISTON MOVABLE IN SAID CYLINDER BODY, A TUBULAR BRAKE PISTON ROD SECURED TO SAID BRAKE PISTON AND AXIALLY GUIDED IN SAID CYLINDER FRONT HEAD AND NON-ROTATABLY CONNECTED WITH SAID ROTATABLE FIRST PART OF SAID CYLINDER FRONT HEAD, A SCREW-THREADED PUSH ROD DISPOSED IN SAID TUBULAR BRAKE PISTON ROD IN TELESCOPING RELATION THERETO AND ADAPTED TO BE NON-ROTATABLY CONNECTED WITH A BRAKE RIGGING TO BE OPERATED BY THE BRAKE CYLINDER, TWO NUTS PROVIDED ON SAID PUSH ROD AND ROTATABLY ENGAGED WITH THE SCREW THREADS THEREOF, THE FIRST OF WHICH NUTS IS HOUSED IN SAID TUBULAR BRAKE PISTON ROD SO AS TO PARTAKE IN THE MOVEMENTS THEREOF AND TRANSMIT THE BRAKE POWER FROM SAID TUBULAR PISTON ROD ONTO SAID PUSH ROD AT BRAKING, A CONTROL MEMBER MOVABLE ALONG SAID TUBULAR BRAKE PISTON ROD AND ABUTTABLE BY THE SECOND NUT FOR LIMITING AXIAL MOVEMENT THEREOF IN RELATION TO SAID CYLINDER FRONT HEAD TO A DISTANCE EQUAL TO A NORMAL BRAKE APPLYING STROKE OF SAID BRAKE PISTON AND FOR LIMITING RETURN MOVEMENT OF SAID BRAKE PISTON IN THE REAR END POSITION THEREOF AT RELEASED BRAKE, AND AN ABUTMENT PROVIDED IN SAID TUBULAR PISTON ROD IN FRONT OF SAID SECOND NUT AND ENGAGEABLE THEREWITH FOR LOCKING IT ON SAID SCREW-THREADED PUSH ROD.