Pumping machine for heavy flowable cementitious materials

Claim 1

IN A PUMPING MACHINE FOR PLASTIC FLOWABLE MATERIALS, SAID MACHINE INCLUDING A MOTOR; THE COMBINATION OF: A ROTATABLE SHAFT DRIVEN BY THE MOTOR; A PUMP CASING HAVING A PERIPHERAL WALL COAXIAL WITH SAID SHAFT AND PROVIDING A PUMP CHAMBER; SAID WALL HAVING SPACED ADJACENT INLET AND OUTLET OPENINGS FOR SAID CHAMBER AND HAVING A VALVE OPENING BETWEEN SAID INLET AND OUTLET OPEINGS; A ROTOR MEANS ON SAID SHAFT WITHIN SAID CHAMBER; VALVE MEANS RECIPROCALLY MOVABLE THROUGH SAID VALVE OPENING INTO SAID CHAMBER IN RELATION TO ROTATIONAL MOVEMENT OF SAID ROTOR MEANS; EXTERNAL MEANS SURROUNDING SAID CASING FOR ACTUATING SAID VALVE MEANS IN TIMED RELATION TO ROTATION OF SAID ROTOR MEANS TO DISCHARGE PUMPED MATERIAL THROUGH SAID OUTLET OPENING; SAID ACTUATING MEANS INCLUDING A FRAME MEANS CONNECTED WITH SAID VALVE MEANS AND SURROUNDING SAID PUMP CASING; CAM FOLLOWER MEANS ON SAID FRAME MEANS; CAM MEANS ON SAID ROTATABLE SHAFT ENGAGEABLE BY SAID CAM FOLLOWER MEANS FOR RECIPROCATING SAID FRAME MEANS AND VALVE MEANS IN A PLANE; SAID CAM MEANS ON SAID SHAFT INCLUDING AT EACH SIDE OF SAID PUMP CASING A CAM MEMBER FOR CAMMING SAID VALVE MEANS INTO SAID CHAMBER AND A SEPARATE CAM MEMBER FOR CAMMING SAID VALVE MEANS OUT OF SAID CHAMBER.