Flowmeter with calibrating means

Claim 1

A FLOWMETER COMPRISING AN ELONGATED HOUSING ADAPTED TO BE INSERTED IN A FLUID FLOW PIPE TO THEREBY ESTABLISH A FLOW OF FLUID THROUGH SAID HOUSING IN A DIRECTION SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF SAID HOUSING; A ROTOR POSITIONED IN SAID HOUSING AND OPERABLE BY THE FLOW OF FLUID THERETHROUGH; A PLURALITY OF VANES LOCATED UPSTREAM FROM SAID ROTOR, EACH VANE EXTENDING IN RADIAL AND AXIAL DIRECTIONS IN SAID HOUSING; A RING MEMBER ABUTTING THE INNER WALL OF SAID HOUSING AT A LOCATION ADJACENT ONE AXIAL END OF SAID VANES, SAID MEMBER BEING CONSTRUCTED AND ARRANGED FOR ROTARY MOVEMENT ABOUT THE AXIS OF SAID HOUSING AND HAVING MEANS FORMED THEREIN MOUNTING THE RADIALLY OUTER EDGES OF ALL OF SAID VANES, AT SAID ONE AXIAL END THEREOF, TO FIRMLY SECURE ALL OF SAID VANES TO SAID MEMBER; MANUALLY OPERABLE DRIVING MEANS COUPLED TO SAID MEMBER FOR CAUSING ROTARY MOVEMENT THEREOF; A FIXED RING MEMBER ABUTTING THE INNER WALL OF SAID HOUSING AT A LOCATION ADJACENT THE OTHER AXIAL END OF SAID VANES AND HAVING MEANS FORMED THEREIN MOUNTING THE RADIALLY OUTER EDGES OF ALL OF SAID VANES, AT SAID OTHER AXIAL END THEREOF, TO FIRMLY SECURE ALL OF SAID VANES TO SAID FIXED MEMBER; AND INNER EDGES OF ALL OF SAID VANES, AT BOTH SAID ONE AND SAID OTHER AXIAL ENDS THEREOF.