Pressure-actuated pump control mechanisms

Claim 1

PRESSURE-ACTUATED CONTROL MECHANISM FOR A PUMP ADAPTED TO PUMP LIQUID RELATIVE TO A SUMP, COMPRISING AN UPPER HOUSING CORRESPONDING TO A HIGH LIQUID LEVEL IN THE SUMP, A LOWER HOUSING CORRESPONDING TO A LOWER LIQUID LEVEL IN THE SUMP, TWO PUMP-DRIVING MOTOR MEANS FOR DRIVING TWO PUMPS, RESPECTIVELY, A FIRST PRESSURE-ACTUATED SWITCH MEANS RECEIVED IN SAID UPPER HOUSING, SUBJECTED TO THE PRESSURE OF LIQUID IN THE SUMP AT A FIRST PREDETERMINED LEVEL OF THE LIQUID RELATIVE TO SAID UPPER HOUSING OPERATIVELY CONNECTED TO ONE OF SAID PUMP-DRIVING MOTOR MEANS AND OPERATED AUTOMATICALLY IN RESPONSE TO INCREASE IN THE LEVER OF LIQUID IN THE SUMP TO SUCH FIRST PREDETERMINED LEVEL TO ENERGIZE SAID ONE PUMP-DRIVING MOTOR MEANS, IN SECOND PRESSURE-ACTUATED SWITCH MEANS IN SAID UPPER HOUSING, SUBJECTED TO THE PRESSURE OF LIQUID IN THE SUMP AT A SECOND PREDETERMINED LEVEL OF THE LIQUID RELATIVE TO SAID UPPER HOUSING HIGHER THAN SAID FIRST PREDETERMINED LEVEL, OPERATIVELY CONNECTED TO THE OTHER OF SAID PUMP-DRIVING MOTOR MEANS AND OPERATED AUTOMATICALLY IN RESPONSE TO INCREASE IN THE LEVEL OF LIQUID IN THE SUMP FROM SUCH FIRST PREDETERMINED LEVEL TO SUCH SECOND PREDETERMINED LEVEL TO ENERGIZE SAID OTHER PUMP-DRIVING MOTOR MEANS, A THIRD PRESSURE-ACTUATED SWITCH MEANS RECEIVED IN SAID LOWER HOUSING SUBJECTED TO THE PRESSURE OF LIQUID IN THE SUMP AT A FIRST PREDETERMINED LEVEL OF THE LIQUID RELATIVE TO SAID LOWER HOUSING, OPERATIVELY CONNECTED TO ONE OF SAID PUMPDRIVING MOTOR MEANS AND OPERATED AUTOMATICALLY IN RESPONSE TO DECREASE IN THE LEVEL OF LIQUID IN THE SUMP TO SUCH FIRST PREDETRMINED LEVEL TO DEENERGIZE SAID ONE PUMP-DRIVING MOTOR MEANS, AND A FORUTH PRESSURE-ACTUATED SWITCH MEANS IN SAID LOWER HOUSING SUBJECTED TO THE PRESSURE OF LIQUID IN THE SUMP AT A SECOND PREDETERMINED LEVEL OF THE LIQUID RELATIVE TO SAID LOWER HOUSING, DIFFERENT FROM SUCH FIRST PREDETERMINED LEVEL RELATIVE TO SAID LOWER HOUSING, OPERATIVELY CONNECTED TO THE OTHER OF SAID PUMPDRIVING MOTOR MEANS AND OPERATED AUTOMATICALLY IN RESPONSE TO REDUCTION IN THE LEVEL OF LIQUID IN THE SUMP TO SUCH SECOND PREDETERMINED LEVEL RELATIVE TO SAID LOWER HOUSING TO EFFECT DEENERGIZATION OF SAID OTHER MOTOR MEANS.