Internally cooled gas pump

Claim 1

IN A GAS PUMP HAVING A CASING WITH A CYLINDRICAL BORE, END HEADS FOR SAID CASING DEFINING WITH SAID BORE A WORKING CHAMBER, A SHAFT JOURNALLED IN SAID END HEADS GENERALLY CONCENTRIC WITH SAID WORKING CHAMBER, AN ECCENTRIC BEARING ON SAID SHAFT, A ROLLER OF SMALLER DIAMETER THAN AND ARRANGED IN SAID BORE TO HAVE CONTRACT WITH SAID END HEADS AND JOURNALLED ON SAID ECCENTRIC BEARING TO HAVE SUBSTANTIALLY LINE ROLLING CONTACT WITH SAID BORE AS SAID SHAFT ROTATES, AND A VANE PARALLEL WITH SAID ROLLER ENGAGING THE PHERIPHERY THEREOF AND MOVING IN A RADIAL WAY IN SAID CASING TO DIVIDE THE SPACE IN SAID WORKING CHAMBER BETWEEN SAID BORE AND ROLLER INTO INLET AND OUTLET CHAMBERS HAVING GAS INLETS AND OUTLETS RESPECTIVELY; THE COMBINATION THEREWITH OF MEANS FOR COOLING SAID ECCENTRIC BEARING COMPRISING MEANS PROVIDING PASSAGES AXIALLY THROUGH SAID END HEADS AND ROLLER AND AROUND SAID ECCENTRIC BEARING, AND MEANS MOVING A COOLING THROUGH SAID PASSAGES.