Improvements in brake discs

Claim 1

AN ANNULAR BRAKE DISC COMPRISING A PLURALITY OF RING SEGMENTS, EACH SEGMENT HAVING PLANE SIDE FACES AND RADIALLY EXTENDING EDGES, EACH RADIAL EDGE OF ONE SEGMENT ABUTTING A RADIAL EDGE OF AN ADJACENT SEGMENT TO FORM A FLAT ANNULAR DISC, SAID SEGMENTS HAVING INTERLOCKING ENGAGEMENTS AT SAID RADIAL EDGES EACH SAID INTERLOCKING ENGAGEMENT COMPRISING A CO-PLANAR EXTENSION FROM A FIRST SEGMENT HAVING A NECK PORTION WITH PARALLEL EDGES EXTENDING FROM AND NORMAL TO A RADIAL EDGE OF SAID SEGMENT AND A HEAD AT THE FREE END OF SAID NECK PORTION OF A DIAMETER IN A RADIAL DIRECTION GREATER THAN THE WIDTH OF SAID NECK PORTION AND A RECESS EXTENDING FROM A SECOND SEGMENT COMPRISING A PASSAGE POSITIONED TO RECEIVE THE NECK PORTION OF THE FIRST SEGMENT AND HAVING A RADIAL EDGE IN SLIDING CONTACT WITH ONE RADIAL EDGE OF THE NECK PORTION OF SAID FIRST SEGMENT AND AN OPPOSITE EDGE IN CONTACT WITH THE OPPOSITE EDGE OF SAID NECK PORTION ADJACENT SAID HEAD AND DIVERGING THEREFROM TO SAID RADIAL EDGE OF SAID SECOND SEGMENT, SAID RECESS BEING ENLARGED AT THE END OF SAID PASSAGE TO RECEIVE SAID HEAD AND TO PERMIT LIMITED MOVEMENT OF SAID HEAD AND NECK PORTIONS OF SAID FIRST SEGMENT IN A DIRECTION NORMAL TO SAID ABUTTING RADIAL EDGES OF SAID SEGMENTS.