Plunger-type pump

Claim 1

A PUMP COMPRISING A HOUSING, MEANS DEFINING A LONGITUDINALLY EXTENDING PUMP CHAMBER THEREIN HAVING A BOTTOM WALL AND INLET AND OUTLET OPENINGS, A CYLINDER LEADING ANGULARLY FROM SAID HOUSING AND COMMUNICATING THEREWITH, SAID CYLINDER HAVING A GUIDING SURFACE ADJACENT TO THE PUMP CHAMBER, A PLUNGER OPERATIVE IN SAID CYLINDER ALONG SAID GUIDING SURFACE, SAID PLUNGER BEING OPERATIVE TOWARD AND AWAY FROM SAID BOTTOM WALL OF THE PUMPING CHAMBER FOR MOVING LIQUID THROUGH SAID CHAMBER, AN END WALL ON SAID PLUNGER, VALVE MEANS AT OPPOSITE ENDS OF SAID PUMP CHAMBER ARRANGED TO PERMIT LIQUID BEING PUMPED TO MOVE IN ONE DIRECTION THROUGH SAID PUMP CHAMBER, THE BOTTOM WALL OF SAID PUMP CHAMBER AND SAID END WALL OF THE PLUNGER HAVING AN ACUTE ANGLED DISPOSITION WITH RELATION TO EACH OTHER WITH THE WIDENING AREA THEREBETWEEN LEADING TOWARD THE OUTLET OPENING, MEANS IN SAID CYLINDER DISPOSED OUTWARDLY FROM SAID INNER GUIDING SURFACE DEFINING A SOCKET, A GUIDE RING REMOVABLY MOUNTED IN SAID SOCKET AND HAVING AN INNER GUIDING SURFACE COEXTENSIVE WITH THE GUIDING SURFACE OF SAID CYLINDER, AND A FLANGE ON SAID GUIDE RING EXTENDING AWAY FROM SAID PUMP CHAMBER, SAID FLANGE HAVING AN INNER DEFINING SURFACE DISPOSED OUTWARDLY FROM THE PLANE OF THE INNER DEFINING SURFACE OF SAID GUIDE RING WHEREBY TO FORM A LUBRICANT CONTAINING RESERVOIR BETWEEN SAID FLANGE AND SAID PLUNGER.