Automatically supervised flow meter apparatus

Claim 1

AN AUTOMATICALLY SUPERVISED FLOW METER APPARATUS FOR CONNECTION IN A FLUID CONDUIT TO MEASURE THE FLOW THERETHROUGH, SAID FLOW METER APPARATUS INCLUDING A FIRST FLUID FLOW METER AND A SECOND FLUID FLOW METER, EACH SAID METER INCLUDING A FLUID INLET CONNECTION, A FLUID OUTLET CONNECTION AND AN OUTPUT SHAFT ROTATABLY DRIVEN BY FLUID FLOW THROUGH EACH SAID METER, THE OUTLET CONNECTION OF THE FIRST SAID METER BEING CONNECTED TO THE INLET CONNECTION OF THE SECOND SAID METER, SAID FIRST AND SECOND FLOW METERS BEING CONNECTED IN SAID CONDUIT FOR PASSAGE OF THE FLUIDS IN SAID CONDUIT THROUGH SAID FIRST AND SECOND METERS IN SERIES, A DIFFERENTIAL GEARING INCLUDING A FIRST DRIVE MEMBER, A SECOND DRIVE MEMBER AND AN OUTPUT MEMBER DRIVEN DIFFERENTIALLY BY SAID FIRST AND SECOND DRIVE MEMBERS, SAID FIRST DRIVE MEMBER BEING CONNECTED TO THE OUTPUT SHAFT OF SAID FIRST METER TO BE DRIVEN THEREBY AND SAID SECOND DRIVE MEMBER BEING CONNECTED TO THE OUTPUT SHAFT OF SAID SECOND METER TO BE DRIVEN THEREBY, MEANS CONNECTED IN SAID CONDUIT FOR CONTROLLING THE PASSAGE OF FLUID THERETHROUGH AND THROUGH SAID METERS, A CONTROL DEVICE CONNECTED TO SAID MEANS ACTUABLE TO OPERATE SAID MEANS TO STOP PASSAGE OF FLUID THROUGH SAID CONDUIT AND SAID METERS, AND A SWITCH HAVING AN ACTUATING ELEMENT EXTENDING THEREFROM AND A CONTOL ELEMENT FOR ACTUATING SAID CONTROL DEVICE MOUNTED TO BE OPERATED BY SAID OUTPUT MEMBER OF SAID DIFFERENTIAL CONNECTION UPON A PREDETERMINED MOVEMENT OF SAID OUTPUT MEMBER OF SAID DIFFERENTIAL CONNECTION, SAID CONTROL ELEMENT INCLUDING A WHEEL HAVING TWO PEGS THEREON POSITIONED WITH SAID ACTUATING ELEMENT LOCATED IN THE PATH OF MOVEMENT OF SAID PEGS AS SAID CONTROL ELEMENT IS DRIVEN BY SAID OUTPUT MEMBER.