Ball-type linkage joint

Claim 1

A BALL-TYPE LINKAGE JOINT FOR INTERCONNECTING AN ARM AND LINK COMPRISING, HALF-SOCKET PORTIONS INTERCONNECTED IN OPPOSED FACING RELATION, SAID HALF-SOCKETS HAVING CENTRAL ALIGNED APERTURES AND ONE HALF-SOCKET BEING LINED WITH A BEARING INSERT INCLUDING SPACED LONGITUDINAL GREASE PASSAGES, A BALL STUD UNIT DISPOSED IN THE ONE HALF-SOCKET WITH THE STUD BEING SIZED FOR PROJECTION IN SPACED RELATION THROUGH THE APERTURE OF ONE HALF-SOCKET, AND THE BALL PORTION HAVING A HEMISPHERICAL WEAR SURFACE, A FLOATING SEAT INTERPOSED BETWEEN SAID HALF-SOCKETS IN ENGAGEMENT WITH SAID WEAR SURFACE, AN ADJUSTABLE SEAT ADAPTED TO LOOSELY CENTER SAID FLOATING SEAT WITH RESPECT TO SAID BALL AND INCLUDING AN EXTERNALLY AND INTERNALLY THREADED OUTER CONCENTRIC, TUBULAR STEM PROJECTING OUTWARDLY THROUGH THE APERTURE OF SAID OTHER HALF-SOCKET, AN ADJUSTABLE SEAT LOCK NUT THREADED EXTERNALLY ON SAID STEM TO LOCK SAID ADJUSTABLE SEAT IN SAID OTHER HALF-SOCKET, AN ELONGATED ADJUSTING SCREW THREADED THROUGH SAID STEM INTO ENGAGEMENT WITH SAID FLOATING SEAT TO URGE IT AGAINST SAID HEMISPHERICAL WEAR SURFACE, SAID SCREW INCLUDING A TOOLENGAGING OUTER END PORTION FOR INWARD AND OUTWARD ADJUSTMENT THEREOF, AND LOCKING MEANS THREADABLY ENGAGING SAID SCREW BETWEEN SAID OUTER END PORTION AND THE TERMINAL END OF SAID STEM AND BEARING AGAINST THE TERMINAL END OF SAID STEM WHEREBY TO SIMULTANEOUSLY LOCK SAID SCREW AND ADJUSTABLE SEAT IN FIXED RELATION TO ONE ANOTHER AND WITH THE INNER END OF SAID SCREW BEARING AGAINST THE END OF SAID FLOATING SEAT IN CENTERED RELATION OPPOSITE SAID WEAR SURFACE, WHEREBY BY ADJUSTMENT OF SAID ADJUSTMENT SCREW SAID FLOATING SEAT MAY BE POSITIONED WITH RESPECT TO SAID WEAR SURFACE, AND INDEPENDENT ADJUSTMENT OF SAID ADJUSTMENT SCREW AND FLOATING SEAT MAY BE ACCOMPLISHED WITH RESPECT TO SAID ADJUSTABLE SEAT.