Caliper type disk brake

Claim 1

IN COMBINATION WITH A ROTATABLE BRAKE DISK, A BRAKE ASSEMBLY COMPRISING FIRST AND SECOND FRICTION ELEMENTS FRICTIONALLY ENGAGEABLE WITH THE OPPOSITE SIDES OF SAID DISK WHICH RESPECTIVELY CONFRONT SAID FIRST AND SECOND FRICTION ELEMENTS, A NONROTATABLE SUBSTANTIALLY U-SHAPED GUIDE MEMBER STRADDLING A PORTION OF THE PERIPHERY OF SAID DISK AND HAVING FORMED THEREIN TWO OPPOSED APERTURES DISPOSED ONE ON EACH SIDE OF SAID DISK, ADJACENT THE DISK PERIPHERY AND PROPORTIONAL TO RECEIVE SAID FRICTION ELEMENTS IN SLIDABLE AND NONROTATABLE RELATION THEREIN, EXPANDER MEANS COMPRISED OF FIRST AND SECOND SEPARABLE MEMBERS ARRANGED TO BE FORCED APART WHEN ONE OF SUCH MEMBERS EXECUTES ANGULAR MOVEMENT WITH RESPECT TO THE OTHER MEMBER, MEANS FORMING AN OPERATIVE ENGAGEMENT BETWEEN ONE OF SAID SEPARABLE MEMBERS AND SAID FIRST FRICTION ELEMENT TO IMPART BIASING EFFORT THERON, OPERATING MEANS ATTACHED TO THE OTHER SAID MEMBERS AND ANGULARLY MOVABLE TO EFFECT ROTATION THEREOF, RIGID CALIPER MEANS STRADDLING SAID DISK AND HAVING ONE LIMB RIGIDLY ATTACHED TO ONE OF SAID FRICTION ELEMENTS AND HAVING FORMED IN THE OTHER LIMB THEREOF AN AXIALLY-EXTENDING BORE, SAID BORE BEING INTERNALLY SCREW THREADED AND DISPOSED WITH THE AXIS OF SUCH BORE EXTENDING THROUGH SUBSTANTIALLY THE CENTER OF EACH OF SAID FRICTION ELEMENTS, THREADED ADJUSTMENT MEANS POSITIONED WITHIN SAID BORE IN SCREW THREADED ENGAGEMENT THEREWITH, SAID OPERATING MEANS BEING DISPOSED BETWEEN SAID THREADED ADJUSTMENT MEANS AND SAID EXPANDER MEANS, THRUST CONNECTION MEANS BETWEEN SAID ADJUSTMENT MEANS AND ONE OF SAID SEPARABLE MEMBERS TO TRANSMIT BRAKE-APPLYING FORCE TO BOTH SAID CALIPER AND ITS ATTACHED SECOND FRICTION ELEMENT AND SAID FIRST FRICTION ELEMENT THEREBY EFFECTING ENGAGEMENT OF BOTH SAID FRICTION ELEMENTS AGAINST THEIR RESPECTIVELY CONFRONTING SURFACES OF SAID DISK, A PAWL-AND-RATCHET DEVICE ASSOCIATED WITH SAID OPERATING MEANS FOR ROTATING SAID ADJUSTMENT MEANS RELATIVELY TO SAID FRICTION ELEMENT MEANS, SAID ADJUSTER MEANS BEING ADAPTED TO POSITION BOTH SAID SEPARABLE MEMBERS AND SAID CALIPER MEANS WHEREBY THE POSITIONS OF SAID FRICTION ELEMENTS ARE DEFINED BY OPERATION OF SAID ADJUSTER MEANS IN RESPONSE TO WEAR OF SAID FRICTION ELEMENTS.