Pump for a domestic appliance

Claim 1

IN A DISHWASHER, THE COMBINATION OF, A WATER CONTAINER HAVING A SUMP AND A DRAIN, SAID SUMP HAVING AN INNER SURFACE, A PLURALITY OF PUMPS SUPPORTED BY SAID WATER CONTAINER WITHIN SAID SUMP, ONE OF SAID PUMPS INCLUDING MEANS TO WITHDRAW AND RETURN FLUID FROM AND TO SAID SUMP, ANOTHER OF SAID PUMPS HAVING MEANS INCLUDING A PUMPING CHAMBER HAVING A DRAIN PASSAGEWAY TO WITHDRAW FLUID FROM SAID DRAIN AND DISCHARGE IT INTO SAID SUMP, DRIVE MEANS INCLUDING A REVERSIBLE ELECTRICAL MOTOR OPERATIVELY CONNECTED TO SAID PUMPS FOR OPERATING SAID PUMPS CONCURRENTLY, SAID MOTOR BEING DRIVEN IN A FIRST DIRECTION DURING A WASHING CYCLE OF OPERATION, SAID MOTOR BEING DRIVEN IN A DIRECTION OPPOSITE TO SAID FIRST DIRECTION DURING A DRAIN CYCLE OF OPERATION, VENT MEANS FOR VENTING A PORTION OF SAID PUMPING CHAMBER OF SAID ANOTHER OF SAID PUMPS CONNECTED TO SAID DRAIN PASSAGEWAY AND TO ATMOSPHERE TO PREVENT SAID ANOTHER TO SAID PUMPS FROM DRAWING FLUID FROM SAID DRAIN AND DISCHARGING IN INTO SAID SUMP DURING THE WASHING CYCLE OF OPERATION, SAID VENT MEANS INCLUDING MEANS TO DIRECT FLUID FROM THE PUMPING CHAMBER OF SAID ANOTHER OF SAID PUMPS AGAINST THE INNER SURFACE OF SAID SUMP TO FLUSH MATTER THEREFROM DURING THE DRAIN CYCLE OF OPERATION.