Dual flow means for gear fuel pumps

Claim 1

A PUMP COMPRISING A CASING HAVING TWO SEPARATE GEAR PUMPING CHAMBERS FORMED THEREIN, A FIRST SET OF DRIVER AND DRIVEN GEARS IN ONE OF SAID PUMPING CHAMBERS AND HAVING A SHAFT ELEMENT PROJECTING AXIALLY OUTWARDLY OF ONE END OF SAID CASING, A SECOND SET OF DRIVER AND DRIVEN GEARS IN THE OTHER OF SAID PUMPING CHAMBERS AND HAVING A HOLLOW SHAFT EXTENSION SURROUNDING SAID SHAFT ELEMENT AND PROJECTING OUT OF SAID ONE END OF SAID CASING, A MOUNTING FLANGE HOUSING PART CONNECTED TO SAID ONE END OF SAID CASING, A DRIVING COUPLING MEMBER JOURNALED IN SAID HOUSING PART HAVING A COUPLING CONNECTION OUTSIDE OF SAID HOUSING PART FOR CONNECTION TO A SOURCE OF DRIVING POWER AND HAVING FORMED INSIDE OF SAID HOUSING PART A COUPLING CONNECTION WITH SAID SHAFT ELEMENT, THEREBY TO ROTATABLY DRIVE SAID FIRST SET OF GEARS, SAID DRIVING COUPLING MEMBER HAVING AN AXIALLY MOVABLE FRICTION DISK COROTATABLY MOUNTED ON THE OUTER PERIPHERAL PORTIONS THEREOF, A FIRST PRESSURE PLATE MEMBER ON ONE SIDE OF SAID FRICTION DISK HAVING A CENTER HUB PORTION FORMED WITH A DRIVING CONNECTION WITH SAID SHAFT EXTENSIION, THEREBY TO DRIVE SAID SECOND SET OF GEARS WHENEVER SAID FIRST PRESSURE PLATE AND SAID FRICTION DISK ARE OPERATIVELY CONNECTED WITH ONE ANOTHER, SAID FIRST PRESSURE PLATE MEMBER HAVING A PERIPHERAL FLANGE SPACED RADIALLY OUTWARDLY OF SAID FRICTION DISK AND EXTENDING AXIALLY BEYOND SAID FRICTION DISK TO FORM A CYLINDER, A COMPRESSION SPRING BOTTOMED IN SAID FLANGE ON THE OTHER SIDE OF SAID DISK, A PISTON MEANS IN SAID CYLINDER ENGAGED AT ONE SIDE WITH SAID SPRING AND BEING BIASED THEREBY AGAINST SAID FRICTION DISK TO NORMALLY LOCK SAID DISK AND SAID PLATE IN CLUTCHED RELATION FOR DUAL FLOW PUMP OPERATION, AND MEANS TO MOVE SAID PISTON MEANS AGAINST SAID SPRING TO DISENGAGE SAID DISK AND SAID PLATE MEMBER FOR HALF-FLOW PUMP OPERATION.