Improvements in disc brakes

Claim 1

A DISC BRAKE COMPRISING A ROTATABLE DISC, A NON-RORATABLE STRUCTURE COMPRISING A PAIR OF SUPPORTING ELEMENTS ONE ON EACH SIDE OF AND SPACED FROM A RADIAL SIDE OF SAID DISC AND EXTENDING ON A COMMON CHORD OF SAID DISC TO PROJECT BEYOND THE PERIPHERY OF SAID DISC AND UNITED TO EACH OTHER BEYOND THE SAID PERIPHERY TO FORM A BASE PLATE, A PAIR OF FRICTION ELEMENTS, ONE ON EACH SIDE OF SAID DISC, A GUIDING AND STRESS SUPPORTING STRUCTURE FOR SAID FRICTION ELEMENTS COMPRISING A PAIR OF GUIDING AND STRESS SUPPORTING MEMBERS RIGIDLY FIXED ON BOTH SAID SUPPORTING ELEMENTS AND EXTENDING FROM THE SIDE OF SAID SUPPORTING ELEMENTS REMOTE FROM THE AXIS OF SAID DISC TO A DISTANCE BEYOND THE PERIPHERY OF SAID DISC, THE GUIDING AND STRESS SUPPORTING MEMBERS BEING SPACED FROM EACH OTHER TO FORM A GUIDE PASSAGE FOR EACH OF SAID FRICTION ELEMENTS TRANSVERSE TO THE PLANE OF SAID DISC AND OPEN TO SAID DISC IN WHICH SAID FRICTION ELEMENTS ARE RETAINED AND GUIDED IN MOVEMENT TO AND FROM THE BRAKING SURFACES OF SAID DISC AND A PAIR OF BRAKE ACTUATING MEANS COMPRISING A PRESSURE PLATE PIVOTED TO THE BASE PLATE, AN OPERATING LEVER FULCRUMED TO ONE OF THE PRESSURE PLATES, AND A LINK SITUATED BEYOND THE PERIPHERY OF THE DISC CONNECTING THE LEVER TO THE OTHER PRESSURE PLATE, ANGULAR MOVEMENT OF THE OPERATING LEVER BEING EFFECTIVE TO MOVE BOTH PRESSURE PLATES TOWARD THE DISC AND THEREBY FORCE THE FRICTION ELEMENTS INTO BRAKING ENGAGEMENT WITH THE DISC, AND A WEAR COMPENSATING DEVICE TRANSMITTING PRESSURE FROM SAID PRESSURE PLATE TO SAID FRICTION PAD ASSEMBLY TO MOVE SAID FRICTION PAD ASSEMBLY AGAINST SAID DISC AND TO WITHDRAW SAID ASSEMBLY UPON MOVEMENT IN THE REVERSE DIRECTION, SAID WEAR COMPENSATING DEVICE COMPRISING A HOLLOW, INTERNALLY THREADED, OUTER CYLINDER, AN EXTERNALLY THREADED INNER CYLINDER THREADED INTO SAID OUTER CYLINDER, ONE OF SAID CYLINDERS BEING ROTATABLY CONNECTED TO SAID PRESSURE PLATE AND THE OTHER CYLINDER BEING CONNECTED TO THE FRICTION PAD ASSEMBLY, AND A SPRING TORSIONED TO ROTATE SAID INNER CYLINDER OUTWARDLY OF SAID OUTER CYLINDER WHEN SAID PRESSURE PLATE MOVES AWAY FROM SAID FRICTION PAD ASSEMBLY.