Fluid meters

Claim 1

A FLUID METER, COMPRISING, IN COMBINATION: A BODY MEMBER HAVING A FLUID CAVITY ADAPTED TO RECEIVE FLUID; THE BODY MEMBER HAVING A FIRST AND A SECOND PAIR OF RADIALLY DISPOSED EXPANSIONABLE CHAMBERS; EXPANSIONABLE CHAMBER MEMBERS ACTUATABLE WITHIN SAID EXPANSIONABLE CHAMBERS WHEREBY THE VOLUME OF EACH OF SAID EXPANSIONABLE CHAMBERS MAY BE VARIED; A FIRST YOKE MEMBER EXTENDING FROM ONE OF SAID EXPANSIONABLE CHAMBER MEMBERS OF SAID FIRST PAIR TO THE OTHER OF SAID EXPANSIONABLE CHAMBER MEMBERS OF SAID FIRST PAIR; A SECOND YOKE MEMBER EXTENDING FROM ONE OF SAID EXPANSIONABLE CHAMBER MEMBERS OF SAID SECOND PAIR TO THE OTHER OF SAID EXPANSIONABLE CHAMBER MEMBERS OF SAID SECOND PAIR AND BEING ALIGNED IN A PLANE PARALLEL TO THE PLANE OF THE FIRST YOKE MEMBER AND IN CLOSE PROXIMITY THERETO; THE AXES OF THE YOKE MEMBERS BEING DISPOSED FOR RECIPROCATION AT SUBSTANTIALLY RIGHT ANGLES WITH RESPECT THERETO, AND EACH OF SAID YOKE MEMBERS HAVING AN OPENING THEREIN, THE OPENING IN SAID FIRST YOKE MEMBER OVERLAPPING SAID OPENING IN SAID SECOND YOKE MEMBER; A PORT PLATE POSITIONED IN A PLANE PARALLEL TO SAID YOKES AND IN NEAR PROXIMITY THERETO, SAID PORT PLATE HAVING A DISCHARGE OPENING THEREIN COMMUNICATING WITH THE EXTERIOR OF SAID BODY MEMBER AND FOUR FLUID CONTROL OPENINGS THEREIN EACH HAVING PASSAGE CONTINUITY WITH ONE OF SAID EXPANSIONABLE CHAMBERS; AN INVERTED CUP SLIDE MEMBER DISPOSED IN SLIDING ENGAGEMENT WITH THE SURFACE OF THE PORT PLATE, SAID INVERTED CUP SLIDE MEMBER EXTENDING THROUGH SAID OVERLAPPING OPENINGS IN SAID YOKE MEMBERS AND ADAPTABLE THEREBY TO BE MOVABLY POSITIONED ON SAID PORT PLATE BY MOVEMENT OF SAID YOKE MEMBERS, SAID INVERTED CUP SLIDE HAVING A FLUID CAVITY FORMED IN THE BOTTOM SURFACE THEREOF ADAPTABLE TO PERMIT FLUID TO FLOW FROM SAID FLUID CONTROL OPENINGS INTO SAID DISCHARGE OPENING ACCORDING TO THE POSITION OF SAID INVERTED CUP SLIDE MEMBER; MEANS FOR INSURING FULL RECIPROCAL STROKING MOVEMENT OF SAID YOKE MEMBERS, SAID MEANS BEING ADAPTED TO EXTRACT ENERGY FROM THE FLOW OF FLUID THROUGH SAID METER ON THE FIRST PORTION OF THE RECIPROCAL MOVEMENT OF EACH OF SAID YOKE MEMBERS AND TO RETURN SAID ENERGY TO THE FLOW OF FLUID THROUGH SAID METER ON THE LAST PORTION OF THE RECIPROCAL MOVEMENT OF EACH OF SAID YOKE MEMBERS WHEREBY EACH RECIPROCAL MOVEMENT OF EACH OF SAID YOKE MEMBERS INCREASES ONE OF SAID EXPANSIONABLE CHAMBERS TO THE MAXIMUM VOLUME THEREOF AND DECREASES THE OTHER OF SAID EXPANSIONABLE CHAMBERS TO THE MINIMUM VOLUME THEREOF; AND MEANS FOR DETECTING THE NUMBER OF RECIPROCAL MOVEMENTS OF ONE OF SAID YOKE MEMBERS, SAID NUMBER OF RECIPROCAL MOVEMENTS BEING INDICATIVE OF THE VOLUME OF FLUID FLOW THROUGH SAID METER.