Pump and strainer combination

Claim 1

A PUMP COMPRISING A HOUSING, MEANS DEFINING A CHAMBER WITHIN SAID HOUSING, A PAIR OF PORTS LEADING TO THE OUTSIDE OF SAID HOUSING AND COMMUNICATING WITH SAID CHAMBER, A REVERSIBLE POWER-DRIVEN IMPELLER MOUNTED IN SAID HOUSING OPERABLE TO PUMP FLUID FROM SAID CHAMBER WHEN ROTATED IN ONE DIRECTION, AND TO PUMP FLUID INTO SAID CHAMBR WHEN ROTATED IN THE OPPOSITE DIRECTION, CHECK VALVE MEANS FOR ONE OF SAID PORTS ACCOMMODATING FLUID FLOW INTO SAID CHAMBER ONLY, MOVABLE STRAINER MECHANISM MOUNTED IN SAID CHAMBER INCLUDING CLOSURE MEANS SHIFTABLE BETWEEN POSITIONS OPENING AND CLOSING THE OTHER OF SAID PORTS, AND MEANS WHEREBY WHEN SAID IMPELLER IS ROTATED IN SAID ONE DIRECTION SAID STRAINER MECHANISM IS MOVED SO AS TO SHIFT SAID CLOSURE MEANS TO A POSITION CLOSING SAID OTHER PORT, AND WHEN SAID IMPELLER IS ROTATED IN SAID OPPOSITE DIRECTION AND STRAINER MECHANISM IS MOVED SO AS TO SHIFT SAID CLOSURE MEANS TO A POSITION OPENING SAID OTHER PORT.