Silicon controlled rectifier actuated liquid gas filler

Claim 1

FOR USE IN A MEANS FOR MAINTAINING THE LEVEL OF A LIQUID BETWEEN AN UPPER AND A LOWER LIMIT IN A CONTAINER, SAID MEANS INCLUDING STORAGE MANS FOR SAID LIQUID AND MOTIVE MEANS FOR TRANSFERRING SAID LIQUID FROM SAID STORAGE MEANS TO SAID CONTAINER, A CONTROL CIRCUIT FOR SAID MOTIVE MEANS COMPRISING A SOLENOID WINDING ADAPTED TO EFFECT ACTUATION OF THE SAID MOTIVE MEANS; FIRST THERMISTOR MEANS ADAPTED TO BE SUBMERGED IN SAID LIQUID AT THE UPPER LIMIT THEREOF; SECOND THERMISTOR MEANS ADAPTED TO BE SUBMERGED IN SAID LIQUID ABOVE SAID LOWER LIMIT THEREOF; A POWER SOURCE; A SILICON CONTROLLED RECTIFIER MEANS IN CIRCUIT WITH SAID SOLENOID WINDING AND SAID POWER SOURCE SELECTIVELY CONTROLLING THE FLOW OF POWER FROM SAID POWER SOURCE THROUGH SAID WINDING; BIAS CIRCUIT MEANS CONNECTED ACROSS SAID POWER SOURCE CONTROLLED BY AND INCLUDING SAID SECOND THERMISTOR MEANS, RENDERING SAID CONTROLLED RECTIFIER MEANS CONDUCTIVE AND ENERGIZING SAID WINDING WHEN THE LEVEL OF THE SAID LIQUID IS BELOW SAID LOWER LIMIT; AND HOLDING CIRCUIT MEANS INCLUDING SAID FIRST THERMSITOR AND SAID SOLENOID WINDING MAINTAINING SAID CONTROLLED RECTIFIER MEANS CONDUCTIVE ONCE THE LATTER HAS BEEN RENDERED CONDUCTIVE BY SAID BIAS MEANS AND UNTIL THE SAID LIQUID REACHES ITS UPPER LEVEL.