Filling machine for high viscosity materials

Claim 1

A METERING PUMP COMPRISING A CYLINDER MOUNTED FOR ROTATION ON ITS LONGITUDINAL AXIS, SAID CYLINDER HAVING A PORT AT ONE END FOR ENTRY AND EXPULSION OF MATERIAL TO BE MEASURED AND PUMPED, A PISTON ROTATABLE IN SYNCHRONISM WITH SAID CYLINDER AND RECIPROCABLE IN SUCTION AND DISCHARGE STROKES IN SAID PORTED END OF THE CYLINDER, A RELATIVELY STATIONARY HEAD ENCLOSING SAID PORTED END OF THE CYLINDER AND HAVING ANGULARLY DISPLACED SUPPLY AND DELIVERY PORTS SEQUENTIALLY COOPERABLE WITH SAID PORT OF THE ROTATABLY MOUNTED CYLINDER, MEANS FOR ROTATING SAID CYLINDER TO EFFECT SUCCESSIVE REGISTRATION OF THE PORT IN SAID CYLINDER WITH SAID SUPPLY AND DELIVERY PORTS OF THE STATIONARY HEAD, AND MEANS FOR RECIPROCATING SAID PISTON IN THE ROTARY MOVEMENT OF SAID CYLINDER TIMED TO EFFECT REGISTRATION OF THE CYLINDER PORT WITH THE SUPPLY PORT ON THE SUCTION STROKE OF THE PISTON AND REGISTRATION OF THE CYLINDER PORT WITH THE DELIVERY PORT ON THE DISCHARGE STROKE OF THE PISTON, SAID CYLINDER PORT BEING ANGULARLY EXTENDED TO SIMULTANEOUSLY MOMENTARILY CONNECT THE SUPPLY PORT AND DELIVERY PORT IN THE STATIONARY HEAD TO ENABLE RETURN OF EXCESS MATERIAL TO THE SUPPLY PORT ON COMPLETION OF THE SUCTION STROKE OF THE PISTON.