Friction pad retention means

Claim 1

A DISC BRAKE COMPRISING A ROTATABLE DISC, A CALIPER STRADDLING A PORTION OF THE PERIPHERY OF THE DISC AND MOUNTED FOR SUBSTANTIALLY AXIAL MOVEMENT RELATIVE TO THE DISC, FRICTION PAD MEANS FOR ENGAGEMENT WITH OPPOSITE FACES OF SAID DISC, ACTUATING MEANS FOR DIRECTLY APPLYING ONE OF SAID FRICTION MEANS TO THE DISC, SAID FRICTION PAD MEANS HAVING PART-CIRCULAR ENDS OF THE SAME RADIUS AND HAVING A COMMON CENTRE AND BEING OF A CIRCUMFERENTIAL LENGTH GREATER THAN ITS RADIAL DIMENSION, PART-CIRCULAR DRAGTAKING ABUTMENTS IN SAID CALIPER FOR CO-OPERATION WITH THE PART-CIRCULAR ENDS OF SAID ONE FRICTION PAD MEANS, PARTS OF SAID ABUTMENTS BEING LOCATED ON THE RADIALLY OUTER SIDE AND PARTS ON THE RADIALLY INNER SIDE OF A CIRCLE HAVING ITS CENTRE ON THE AXIS OF THE DISC AND PASSING THROUGH THE CENTRE OF PRESSURE OF SAID ONE FRICTION PAD MEANS, SAID INNER AND OUTER ABUTMENT PARTS INCLUDING RADIALLY INNER AND OUTERMOST PORTIONS WHOSE RESPECTIVE CIRCUMFERENTIAL SPACING IS LESS THAN THE CIRCUMFERENTIAL LENGTH OF SAID PAD MEANS SO THAT THE LATTER IN ITS POSITION OF USE IS RESTRAINED BY SAID ABUTMENTS AGAINST RADIAL MOVEMENT WITH RESPECT TO SAID CALIPER, SAID CALIPER HAVING AN OPENING IN THE RADIALLY OUTER SIDE THEREOF, SAID OPENING HAVING A CIRCUMFERENTIAL DIMENSION LESS THAN THAT OF SAID PAD MEANS BUT GREATER THAN THE RADIAL DIMENSION THEREOF, SAID DIMENSION BEING OF A SIZE THAT SAID PAD MEANS CAN BE WITHDRAWN RADIALLY THROUGH SAID OPENING ONLY UPON PARTIAL ROTATION OF SAID PAD MEANS ON SAID ABUTMENTS UNTIL AN END OF SAID PAD MEANS SUBSTANTIALLY REGISTERS WITH SAID OPENING.