Packer assembly

Claim 1

A REFUSE TRUCK COMPRISING A STORAGE BODY, A LOADER ASSEMBLY ON SAID TRUCK INCLUDING A REFUSE LOADER COMPARTMENT HAVING AN OPENING LEADING TO SAID STORAGE BODY, A PACKER PLATE MOVABLE IN SAID COMPARTMENT THROUGH SAID OPENING, FIRST LINEARLY EXTENSIBLE AND CONTRACTIBLE HYDRAULIC MOTOR MEANS HAVING ITS OPPOSITE ENDS PIVOTALLY FIXED, RESPECTIVELY, TO THE PLATE AND TO THE TRUCK, AND INCLUDING A PISTON DIVIDING SAID MOTOR MEANS INTO TWO CHAMBERS, SAID ENDS OF SAID FIRST MOTOR MEANS BEING POSITIONED TO SHIFT SAID PLATE UPWARDLY AND DOWNWARDLY UPON EXPANSION AND CONTRACTION, SECOND LINEARLY EXTENSIBLE AND CONTRACTIBLE MOTOR MEANS HAVING ITS OPPOSITE ENDS PIVOTALLY FIXED, RESPECTIVELY, TO SAID PLATE AND TO SAID TRUCK AND INCLUDING A PISTON DIVIDING SAID SECOND MOTOR MEANS INTO TWO CHAMBERS, SAID ENDS OF SAID SECOND MOTOR MEANS BEING POSITIONED TO SHIFT SAID PLATE FORWARDLY AND REARWARDLY UPON EXPANSION AND CONTRACTION, A PRESSURE LINE CONNECTED WITH EACH CHAMBER OF SAID FIRST MOTOR MEANS, A PRESSURE LINE CONNECTED WITH EACH CHAMBER OF SAID SECOND MOTOR MEANS, A PRESSURE SENSITIVE VALVE CONNECTING EACH OF SAID LINES WITH CONTROL MEANS FOR A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, EACH OF SAID VALVE, UPON THE OCCURRENCE IN ITS ASSOCIATED LINE OF PRESSURE IN EXCESS OF A PREDETERMINED AMOUNT, BEING EFFECTIVE TO SHIFT SAID CONTROL MEANS TO ADMIT PRESSURE TO A LINE OF THE MOTOR MEANS NOT HAVING SAID EXCESSIVE PRESSURE, WHEREBY SAID PLATE IS MOVED AUTOMATICALLY AND REPETITIVELY THROUGH AN ORBITAL PATH.