Safety control mechanism for electric motor-driven machine

Claim 1

IN COMBINATION, AN ELECTRIC MOTOR; A MOTOR-DRIVEN COMPRESSOR HAVING A LIQUID COOLING JACKET WITH A LIQUID INLET CONDUIT AND A LIQUID OUTLET CONDUIT AND FURTHER HAVING A LUBRICANT FLOW SYSTEM INCLUDING A LUBRICANT RESERVOIR; PUMP MEANS MAINTAINING FLOW PRESSURE FOR THE LUBRICANT; A MAIN ELECTRICAL POWER SOURCE; A MANUAL SWITCH FOR CLOSING AN ELECTRICAL CIRCUIT FROM THE POWER SOURCE TO THE MOTOR, SAID SWITCH BEING RETAINED OPEN UNLESS HELD IN CLOSED POSITION; A TRANSFORMER CONNECTED TO THE MAIN POWER SOURCE AND ENERGIZED INITIALLY THROUGH CLOSING OF SAID MANUAL SWITCH; A RELAY CIRCUIT LEADING FROM THE TRANSFORMER AND INCLUDING A RELAY SWITCH EFFECTIVE UPON ENERGIZING OF THE RELAY TO CLOSE THE CIRCUIT TO THE MOTOR AND TRANSFORMER; A FIRST SAFETY SWITCH ASSOCIATED WITH THE LIQUID DISCHARGE CONDUIT IN SAID RELAY CIRCUIT EFFECTIVE TO OPEN SAID RELAY CIRCUIT UPON A PRE-DETERMINED TEMPERATURE IN THE DISCHARGE LIQUID; A SECOND SAFETY SWITCH IN THE RELAY CIRCUIT; A FIRST TIME DELAY RELAY FOR OPENING SAID SECOND SAFETY SWITCH; A LUBRICANT PRESSURE SWITCH IN THE LUBRICANT FLOW SYSTEM EFFECTIVE UPON ABNORMAL PRESSURE IN THE LUBRICANT SYSTEM TO CLOSE A CIRCUIT TO AND TO ENERGIZE THE TIME DELAY RELAY; A LUBRICANT LEVEL SWITCH ASSOCIATED WITH THE LUBRICANT RESERVOIR AND EFFECTIVE UPON INSUFFICIENT SUPPLY OF SAID LUBRICANT TO CLOSE A CIRCUIT TO AND ENERGIZE THE TIME DELAY RELAY; A LIQUID PRESSURE SWITCH ASSOCIATED WITH THE LIQUID INLET CONDUIT EFFECTIVE UPON ABNORMAL PRESSURE IN THE CONDUIT TO CLOSE A CIRCUIT TO AND ENERGIZE THE TIME DELAY RELAY; AN ALARM CIRCUIT HAVING AN OPEN ALARM SWITCH THEREIN EFFECTIVE UPON CLOSING TO PROVIDE AN ALARM; AND A SECOND TIME DELAY RELAY IN PARALLEL WITH SAID FIRST TIME DELAY RELAY AND EFFECTIVE TO BE ENERGIZED UPON SAID LUBRICANT PRESSURE SWITCH, SAID LUBRICABT LEVEL SWITCH, OR SAID LIWUID PRESSURE SWITCH BEING CLOSED, SAID SECOND TIME RELAY BEING ASSOCIATED WITH SAID ALARM SWITCH FOR CLOSING THE SWITCH.