Pavement cutting and earth excavating device

Claim 1

EXCAVATING APPARATUS FOR REMOVING A SURFACE LAYER FROM THE EARTH COMPRISING: A PRIME MOVER; A POWER TAKEOFF FROM SAID PRIME MOVER; A FRAMEWORK HAVING A TOP PORTION, A FORWARD PORTION, A REAR PORTION AND A GROUND ENGAGING PORTION; A PAIR OF OUTER HITCH BRACKETS MOUNTED ON THE FORWARD PORTION OF SAID FRAMEWORK ADJACENT THE SIDES OF SAID FRAMEWOFK AND IN HORIZONTAL ALIGNMENT WITH EACH OTHER; A CENTRAL HITCH BRACKET MOUNTED ON SAID FRAMEWORK TOWARD THE CENTER THEREOF AND VERTICALLY OFFSET FROM THE LINE OF HORIZONTAL ALIGNMENT OF SAID OUTER HITCH BRACKETS WHEREBY SAID FRAMEWORK CAN BE PIVOTED ABOUT A HORIZONTAL AXIS EXTENDING THROUGH SAID OUTER HITCH BRACKETS BY A HITCH LINK CONNECTED TO SAID CENTRAL HITCH BRACKETS; ACTUATING MEANS CONNECTED TO SAID HITCH BRACKETS FOR ACTUATING SAID HITCH BRACKETS TO MOVE SAID FRAMEWORK RELATIVE TO A PLANE SUBSTANTIALLY COPLANAR WITH THE SURFACE OF THE GROUND OVER WHICH SAID EXCAVATING APPARATUS IS MOVED; A PLURALITY OF CUTTER BLADES MOVABLY MOUNTED ON THE FORWARD PORTION OF SAID FRAMEWORK IN ALIGNMENT WITH THE GROUND ENGAGING PORTION THEREOF; DIRT SUPPORTING MEANS EXTENDING UPWARDLY AND REARWARDLY IN SAID FRAMEWOFK FROM A LINE IN JUXTAPOSITION TO THE UPPER SURFACE OF SAID CUTTER BLADES TO RECEIVE MATERIAL SEVERED BY SAID CUTTER BLADES AND SUPPORT AND LIFT SAID MATERIAL AS IT MOVES REARWARDLY WITH RESPECT TO SAID FRAMEWORK; AND POWER TRANSMISSION MEANS ON SAID FRAMEWORK AND HAVING AN INPUT END CONNECTED TO SAID POWER TAKEOFF AND AN OUTPUT END CONNECTED TO SAID CUTTER BLADES FOR RECIPROCATING AT LEAST TWO OF SAID CUTTER BLADES ON SAID FRAMEWORK IN OUT-OF-PHASE RELATION TO EACH OTHER AND IN A DIRECTION OF MOVEMENT ADVANCING FROM, AND RETURNING TO, THE FORWARD PORTION OF SAID FRAMEWORK, SAID POWER TRANSMISSION MEANS INCLUDING TIMING MEANS ADAPTED TO MOVE AT LEAST ONE OF SAID BLADES FORWARDLY WITH RESPECT TO SAID FRAMEWORK AT A DIFFERENT TIME THAN THE TIME AT WHICH ANOTHER OF SAID BLADES IS MOVED FORWARDLY WITH RESPECT TO SAID FRAMEWORK, SAID TIMING MEANS BEING DISPOSED BENEATH SAID DIRT SUPPORTING MEANS AND TO THE REAR OF SAID CUTTER BLADES.