Fluid meter with summating drive

Claim 1

A FLUID METER COMPRISING, IN COMBINATION, A RECORDING MECHANISM; A ROTATABLE VOLUMETRIC METERING DEVICE; AND A SUMMATING DRIVE BETWEEN SAID METERING DEVICE AND SAID RECORDING MECHANISM AND COMPRISING A MAIN DRIVE BRANCH INCLUDING DIFFERENTIAL GEARS AND A SECONDARY DRIVE BRANCH INCLUDING FRICTION WHEEL MEANS, SAID FRICTION WHEEL MEANS INCLUDING A FIRST FRICTION WHEEL HAVING A SIDE BEING CONNECTED TO SAID METERING DEVICE TO BE ROTATED ABOUT SAID AXIS, SAID FIRST FRICTION WHEEL HAVING A SIDE FACE, AND A SECOND FRICTION WHEEL HAVING AN AXIS SUBSTANTIALLY NORMAL TO SAID AXIS OF SAID FIRST FRICTION WHEEL AND ENGAGING SAID SIDE FACE OF THE LATTER TO BE DRIVEN THEREBY, AND MEANS FOR ADJUSTING SAID SECONDARY DRIVE BRANCH COMPRISING EXPANDABLE BELLOWS MEANS IN OPERATIVE ENGAGEMENT WITH THE FLUID TO BE METERED AND CONNECTING MEANS INCLUDING A FIRST LEVER PIVOTALLY MOUNTED AT ONE END THEREOF AND OPERATIVELY ENGAGING IN THE REGION OF THE OTHER END THEREOF SAID SECOND FRICTION WHEEL, AND A TRIANGULAR FUNCTION LEVER PIVOTALLY MOUNTED AT ONE CORNER THEREOF AND ENGAGING AT A SECOND CORNER THEREOF SAID BELLOWS MEANS AND AT THE THIRD CORNER THEREOF SAID FIRST LEVER INTERMEDIATE THE ENDS OF THE LATTER.