Fluid pressure released brake

Claim 1

A BRAKING ARRANGEMENT FOR AN INTERMITTENTLY DRIVEN MACHINE SHAFT, COMPRISING, IN COMBINATION, SUPPORT MEANS; AN ANNULAR CYLINDER FIXEDLY MOUNTED ON SAID SUPPORT MEANS AND HAVING TWO ANNULAR WALLS, AN OPEN END, AND A CLOSED END; AN ANNULAR BRAKE DISC RIGIDLY CONNECTED WITH AT LEAST ONE OF SAID ANNULAR WALLS OF SAID ANNULAR CYLINDER, ARRANGED IN FRONT OF SAID OPEN END THEREOF AND BEING FORMED IN AN OUTER BORDER ZONE THEREOF WITH A PLURALITY OF ANGULARLY SPACED APERTURES, THE OUTER ONE OF SAID ANNULAR WALLS OF SAID CYLINDER BEING AT LEAST IN PART AXIALLY SPACED FROM SAID BRAKE DISC; AN ANNULAR PISTON FLUIDTIGHTLY GUIDED IN SAID ANNULAR CYLINDER FOR MOVEMENT IN AXIAL DIRECTION WHILE BEING PREVENTED FROM TURNING RELATIVE THERETO, SAID PISTON DEFINING WITH SAID CLOSED END OF SAID CYLINDER A WORKING SPACE, SAID PISTON HAVING A PLURALITY OF PROJECTIONS PROJECTING IN RADIAL OUTWARD DIRECTION THROUGH THE SPACE BETWEEN SAID BRAKE DISC AND SAID OUTER ONE OF SAID ANNULAR WALLS OF SAID CYLINDER BEYOND THE LATTER; A PRESSURE RING COAXIAL WITH SAID BRAKE DISC AND LOCATED AT AND SPACED FROM THE SIDE THEREOF FACING AWAY FROM SAID CYLINDER; A PLURALITY OF CONNECTING MEANS FIXEDLY CONNECTING SAID PRESSURE RING AND SAID PROJECTIONS FOR SIMULTANEOUS MOVEMENT IN AXIAL DIRECTION, SAID CONNECTING MEANS EXTENDING RESPECTIVELY THROUGH SAID APERTURES IN SAID BRAKE DISC AND BEING SLIDABLY GUIDED THEREIN; A SECOND BRAKE DISC SECURED TO SAID SHAFT FOR ROTATION THEREWITH AND ENGAGED BETWEEN SAID PRESSURE RING AND SAID ANNULAR BRAKE DISC; PRETENSIONED SPRINGS ENGAGING SAID ANNULAR PISTON AND LOADING THE SAME IN A BRAKING SENSE; AND PASSAGE MEANS COMMUNICATING WITH SAID WORKING SPACE BETWEEN SAID ANNULAR PISTON AND SAID CLOSED END OF SAID CYLINDER FOR FEEDING PRESSURE FLUID INTO AND OUT FROM SAID WORKING SPACE, SO THAT THE BRAKING ARRANGEMENT MAY BE RELEASED BY FEEDING PRESSURE FLUID INTO SAID WORKING SPACE.