Rotary pumps and engines

Claim 1

IN A ROTARY DEVICE, A HOUSING, FOUR ROTOR SECTIONS, EACH SECTION INCLUDING A CIRCULAR END WALL AND AT LEAST ONE ARCUATE PART AND THE SAME NUMBER OF WORKING SPACES, SAID ARCUATE PARTS OF THE SECTIONS PROJECTING AXIALLY FROM THEIR WALLS WHEREBY TWO SECTIONS MAY BE FITTED TOGETHER WITH THEIR ARCUATE PARTS DISPOSED TOWARDS EACH OTHER WITH THE ARCUATE PART OF ONE WITHIN THE WORKING SPACE OF THE OTHER, THE ARCUATE PARTS OF INTERFITTED SECTIONS BEING OF THE SAME AXIAL LENGTH, SAID FOUR SECTIONS BEING ASSEMBLED WITHIN SAID HOUSING IN AXIAL ALINEMENT TO PROVIDE TWO INTERMEDIATE SECTIONS AND TWO REMOTE SECTIONS, MEANS RIGIDLY INTERCONNECTING THE TWO REMOTE SECTIONS TO PROVIDE A FIRST UNIT, MEANS RIGIDLY INTERCONNECTING THE TWO INTERMEDIATE SECTIONS TO PROVIDE A SECOND UNIT, SAID UNITS BEING ROTATABLE INDEPENDENTLY OF EACH OTHER, THE ARCUATE PARTS OF THE INTERMEDIATE SECTIONS BEING DISPOSED AWAY FROM EACH OTHER AND THE ARCUATE PARTS OF THE REMOTE SECTIONS BEING DISPOSED TOWARDS EACH OTHER, EACH REMOTE SECTION AND THE INTERMEDIATE SECTION ADJACENT THERETO BEING FITTED TOGETHER, THERE BEING WORKING CLEARANCES BETWEEN THE UNITS AND BETWEEN THE UNITS AND THE HOUSING, THE ARCUATE LENGTH OF EACH WORKING SPACE BEING ENOUGH GREATER THAN THAT OF THE ARCUATE PART FITTED THEREIN TO PERMIT THE FIRST UNIT TO TURN RELATIVELY TO THE SECOND UNIT AND TO PROVIDE CHAMBERS, EACH DEFINED BY ADJACENT ENDS OF SAID INTERFITTED ARCUATE PARTS, A ROTATABLE MEMBER, AND A DRIVE, SAID DRIVE INCLUDING A FIRST CONNECTION BETWEEN SAID ROTATABLE MEMBER AND SAID FIRST UNIT, AND A SECOND CONNECTION BETWEEN THE MEMBER AND SAID SECOND UNIT, SAID DRIVE INCLUDING MEANS TURNING SAID UNITS CONTINUOUSLY IN ONE DIRECTION BUT AT VARYING RELATIVE SPEEDS TO CAUSE MOVEMENT OF SAID ADJACENT ENDS OF SAID INTERFITTED ARCUATE PARTS ALTERNATELY TOWARDS AND AWAY FROM EACH OTHER.