Transversely adjustable boom mounting for earthworking apparatus

Claim 1

A BOOM SUPPORT ASSEMBLY FOR BRACKHOES AND THE LIKE COMPRISING A FRAME ADAPTED TO BE TRANSVERSELY MOUNTED ON A TRACTOR, SAID FRAME HAVING SPACED, PARALLEL FRONT AND REAR PANELS JOINED AT THEIR EDGES BY END PANELS, SAID END PANELS EXTENDING BEYOND THE UPPER AND LOWER EDGES OF SAID REAR PANEL, A PAIR OF VERTICALLY SPACED, HORIZONTAL RAIL MEMBERS MOUNTED ON SAID FRAME AND EXTENDING ALONG THE UPPER AND LOWER EDGES OF SAID REAR PANEL, EACH OF SAID RAIL MEMBERS HAVING A PAIR OF UPPER AND LOWER, OPPOSITELY INCLINED FLANGES LYING IN CONVERGING PLANES AND DEFINING A TRACK, A LONGITUDINALY RECESS IN EACH OF SAID RAILS, A SLIDE MEMBER IN EACH OF SAID RECESSES HAVING A PAIR OF SHANKS PROJECTING FROM SAID RECESS THROUGH THE SPACE BETWEEN SAID INCLINED FLANGES, SAID SLIDE MEMBERS EACH HAVING OPPOSITELY INCLINED SURFACES COMPLEMENTARY WITH THE INCLINED FLANGES, A BOOM SUPPORT BRACKET HAVING A PAIR OF VERTICALLY SPACED, APERTURED GUIDE MEMBERS WITH OPPOSITELY INCLINED SURFACES COMPLEMENTARY TO THE OPPOSITELY INCLINED SURFACES OF SAID TRACKS AND ENGAGED WITH THE TRACK ON THE OPPOSITE SIDE THEREOF FROM SAID SLIDE MEMBERS, SAID SHANKS BEING RECEIVED IN THE APERTURES OF SAID GUIDE MEMBERS, AND FASTENING MEANS ON SAID SHANKS OPERABLE TO SELECTIVELY DRAW SAID SLIDE AND GUIDE MEMBERS TOWARD EACH OTHER TO LOCK THE BOOM SUPPORT BRACKET IN ANY SELECTED POSITION ON SAID TRACKS, SAID FASTENING MEANS BEING OPERABLE TO PERMIT SAID GUIDE AND SLIDE MEMBERS TO SLIDE ALONG SAID TRACK UPON LOOSENING THEREOF.