Crankcase draining unit

Claim 1

A NON-VARIABLE, ROTARY DISPLACEMENT PUMP FOR LUBRICATING AND INDUSTRIAL OIL DRAINAGE UNITS WHICH COMPRISES A PUMP CASING HAVING A SUBSTANTIALLY CIRCULAR CHAMBER SURROUNDED BY A STRAIGHT SIDEWALL FABRICATED FROM A SINGLE MATERIAL OF CONSTRUCTION, A CYLINDRICAL IMPELLER HUB ECCENTRICALLY MOUNTED WITHIN SAID CHAMBER IN TANGENTIAL, SUBSTANTIALLY FLUID-TIGHT CONTACT WITH SAID SIDEWALL, SAID HUB BEING PROVIDED WITH A DIAMETRICAL SLOT, A PAIR OF IMPELLER VANES POSITIONED IN SAID SLOT IN SIDE BY SIDE, SLIDING CONTACT, SAID VANES BEING YIELDABLY BIASED OUTWARDLY INTO ABUTMENT WITH SAID SIDEWALL, AND AN INLET PORT ADJACENT SAID TANGENTIAL CONTACT ON ONE SIDE THEREOF, THE SIDE WALL OF SAID INLET PORT ADJACENT SAID TANGENTIAL CONTACT BEING ANGULARLY SPACED THEREFROM TO MISTIME SAID PUMPING CYCLE AND INDUCE PULSATIONS ON ONLY THE INLET SIDE OF SAID PUMP, AND AN OUTLET PORT IN SAID SIDEWALL ADJACENT SAID TANGENTIAL CONTACT ON THE OTHER SIDE THEREOF, SAID OUTLET PORT BEING PROVIDED WITH A RECESSED CAVITY IN SAID SIDEWALL COOPERATING WITH AND SURROUNDING THE OPENING IN SAID OUTLET PORT, A PORTION OF THE MARGINAL EDGE OF SAID RECESSED CAVITY BEING IMMEDIATELY ADJACENT SAID TANGENTIAL CONTACT.