Pump

Claim 1

A PUMP ASSEMBLY, COMPRISING A LIQUID-CONTAINING MEMBER HAVING AN OPENING IN THE LOWER PORTION THEREOF, A PUMP CASING MOUNTED IN THE OPENING OF SAID LIQUID CONTAINING MEMBER, A REVERSIBLE MOTOR CONNECTED TO THE CASING AND LOCATED ON THE EXTERIOR OF SAID LIQUID CONTAINING MEMBER AND HAVING A DRIVE SHAFT EXTENDING INTO SAID PUMP CASING, JOURNALING MEANS CONNECTED TO THE PUMP CASING FOR JOURNALING SAID SHAFT FOR ROTATION, SAID PUMP CASING DEFINING AN UPPER PUMPING CHAMBER AND A LOWER PUMPING CHAMBER AND SAID CASING HAVING A FIRST INLET OPENING DISPOSED GENERALLY AXIALLY OF SAID SHAFT AND COMMUNICATING WITH SAID UPPER PUMPING CHAMBER FOR SUPPLYING A LIQUID FROM SAID LIQUID-CONTAINING MEMBER TO SAID FIRST PUMPING CHAMBER, FIRST OUTLET CONDUIT MEANS PROVIDING COMMUNICATION BETWEEN THE PERIPHERY OF SAID UPPER PUMPING CHAMBER AND SAID LIQUID-CONTAINING MEMBER, AN IMPELLER UNIT SECURED TO THE SHAFT AND INCLUDING A BODY HAVING UPPER AND LOWER FACES, SAID IMPELLER UNIT HAVING A FIRST SERIES OF BLADES MOUNTED ON THE UPPER FACE AND LOCATED WITHIN SAID UPPER PUMPING CHAMBER AND SHAPED TO DEVELOP A HIGH PRESSURE HEAD WHEN SAID IMPELLER UNIT IS ROTATED IN A FIRST DIRECTION AND SHAPED TO DEVELOP A LOW PRESSURE HEAD WHEN THE IMPELLER UNIT IS ROTATED IN THE OPPOSITE DIRECTION, SAID IMPELLER UNIT ALSO HAVING A SECOND SERIES OF BLADES MOUNTED ON THE LOWER FACE AND LOCATED WITHIN SAID LOWER PUMPING CHAMBER, INLET CONDUIT MEANS PROVIDING COMMUNICATION BETWEEN THE LIQUID-CONTAINING MEMBER AND THE LOWER END OF THE PUMPING CHAMBER AT A LOCATION BETWEEN THE SHAFT AND THE PERIPHERY OF SAID SECOND SERIES OF BLADES AND COOPERATING WITH SAID SECOND SERIES OF BLADES TO DEVELOP A LOW PRESSURE HEAD WHEN SAID IMPELLER UNIT IS ROTATED IN SAID FIRST DIRECTION AND DEVELOP A RELATIVELY HIGH PRESSURE HEAD WHEN SAID IMPELLER UNIT IS ROTATED IN THE OPPOSITE DIRECTION, AND DRAIN CONDUIT MEANS CONNECTING THE PERIPHERY OF SAID LOWER PUMPING CHAMBER TO A DRAIN LINE.