Extensible back hoe assembly

Claim 1

IN A TRACTOR MOUNTED BACKHOE OR THE LIKE HAVING A BOOM MOUNTED AT ONE END UPON A TRACTOR AND A DIPPER STICK ASSEMBLY MOUNTED ON THE OPPOSITE END OF SAID BOOM; THE IMPROVEMENT WHEREIN SAID DIPPER STICK ASSEMBLY COMPRISES A HOLLOW SLEEVE MEMBER HAVING A PASSAGE THERETHROUGH PIVOTALLY MOUNTED UPON SAID OTHER END OF SAID BOOM, AN ELONGATE DIPPER STICK MEMBER PROJECTING LONGITUDINALLY THROUGH SAID PASSAGE OF SAID SLEEVE MEMBER, A PLURALITY OF COUPLING BLOCKS EACH HAVING A CYLINDRICAL PORTION AT ONE SIDE THEREOF AND MEANS DEFINING A GUIDING GROOVE IN ITS OPPOSITE SIDE EXTENDING RADIALLY OF SAID CYLINDRICAL PORTION, A PAIR OF ELONGATE GUIDE STRIPS EACH COMPLEMENTARY IN TRANSVERSE SECTION TO THE GUIDING GROOVES IN SAID BLOCKS AND ADAPTED TO BE SLIDABLY RECEIVED THEREIN, ONE OF SAID MEMBERS HAVING BORES THERETHROUGH AT OPPOSITE SIDES OF SAID PASSAGE RECEIVING SAID CYLINDRICAL PORTIONS OF SAID BLOCKS WITH THE GROOVES OF SAID BLOCKS IN FACING RELATIONSHIP TO THE OTHER OF SAID MEMBERS, AND MEANS FIXEDLY MOUNTING SAID GUIDE STRIPS ON THE OTHER OF SAID MEMBERS WITH SAID STRIPS SLIDABLY RECEIVED IN SAID GUIDING GROOVES TO GUIDE SAID DIPPER STICK IN LONGITUDINAL MOVEMENT WITHIN SAID SLEEVE.