Dishwashing machines

Claim 1

A LIQUID IMPELLING APPARATUS FOR A DISHWASHING MACHINE, COMPRISING A HOLLOW SPRAY IMPELLER HEAD HAVING A WALL DEFINING AN INTERIOR CHAMBER OPEN AT ONE END AND BEING PROVIDED WITH A PLURALITY OF JET ORIFICES FOR DELIVERING LIQUID OUTWARDLY FROM SAID CHAMBER AS A SPRAY; STATIONARY MEANS MOUNTING SAID IMPELLER HEAD FOR FREE ROTATION ABOUT AN AXIS EXTENDING THROUGH AND BEING NORMAL TO SAID IMPELLER HEAD OPEN END; A VOLUTE CASING FIXED WITH RESPECT TO SAID STATIONARY MEANS AND COMPRISING A FIRST END WALL, A SECOND END WALL HAVING A DISCHARGE OPENING DIRECTLY REGISTERING AND COMMUNICATING WITH SAID IMPELLER HEAD OPEN END, AND A SPIRAL WALL BETWEEN AND CONNECTING SAID VOLUTE END WALLS, SAID SPIRAL WALL SPIRALLY CONVERGING WITH CONSTANTLY DECREASING RADIUS FROM A POINT SPACED RADIALLY RELATIVELY FAR FROM SAID DISCHARGE OPENING PROGRESSIVELY RADIALLY INWARDLY TOWARD SAID DISCHARGE OPENING, SAID VOLUTE CASING HAVING AN ENTRANCE OPENING BETWEEN PART OF THE SPIRAL WALL RADIALLY NEAREST SAID DISCHARGE OPENING AND THE PART OF SAID SPIRAL WALL RADIALLY FARTHEST THEREFROM MEANS FOR DELIVERING FLUID UNDER PRESSURE TO SAID ENTRANCE OPENING, WHEREBY TO ENFORCE A HIGH VELOCITY ROTATIONAL FLOW OF LIQUID THROUGH SAID VOLUTE CASING DISCHARGE OPENING AND SAID VOLUTE FOR DELIVERY WHILE STILL SWIRLING THROUGH SAID IMPELLER HEAD OPEN END INTO SAID IMPELLER HEAD CHAMBER; AND MEANS ON THE INSIDE OF SAID IMPELLER HEAD CHAMBER WALL AND IN ADDITION THERETO CONTACTABLE BY THE SWIRLING LIQUID FOR ROTATING SAID IMPELLER HEAD.