Detachable connection of a piston with a piston rod, especially for a piston compressor

Claim 1

A PISTON AND PISTON ROD ASSEMBLY PROVIDING A DETACHABLE RIGID CONNECTION THEREBETWEEN, ESPECIALLY IN A HIGH PRESSURE COMPRESSOR, SAID ASSEMBLY COMPRISING IN COMBINATION: A PISTON ROD HAVING AN AXIALLY CONCENTRIC BORE AT ONE END THEREOF, SAID BORE BEING LONGITUDINALLY DIVIDED INTO TWO PISTONS OF DIFFERENT DIAMETERS, AND AT LEAST ONE RADIALLY INWARDLY PROJECTING LUG ON AN ANNULAR PORTION OF THE INNER WALL OF THE BORE OF GREATER DIAMETER AT A POINT INTERMEDIATE THE ENDS THEREOF; A CYLINDRICAL SHANK HAVING ONE END INSERTED FOR BOTH AXIAL AND ROTATIONAL MOVEMENT WITHIN THE CONCENTRIC BORE OF SMALLER DIAMETER OF SAID PISTON ROD, SAID SHANK BEARING AT LEAST ONE RADIALLY OUTWARDLY PROJECTING BOSS CORRESPONDING IN A ANNULAR CROSS SECTION TO SAID LUG OF SAID PISTON ROD AND LOCATED IN ENGAGEMENT BEHIND SAID LUG WITHIN SAID BORE OF GREATER DIAMETER IN THE LOCKED POSITION OF SAID ASSEMBLY; A PISTON HAVING AN AXIAL AND CONCENTRIC BORE CORRESPONDING TO THE DIAMETER OF SAID SHANK AND ALSO HAVING A REARWARD EXTENDING INSERTED AXIALLY INTO SAID BORE OF GREATER DIAMETER OF SAID PISTON ROD, SAID REARWARD EXTENSION INCLUDING AT LEAST ONE TENON FITTED AXIALLY INTO AT LEAST A PORTION OF THE FREE ANNULAR SPACE WHICH REMAINS AROUND SAID SHANK AND WHICH IS UNOCCUPIED BY THE ENGAGED LUG AND BOSS MEMBERS IN THEIR LOCKED POSITION SO AS TO PREVENT ROTATIONAL MOVEMENT OF SAID PISTON AT ITS FORWARD END LOCKING MEANS CONNECTING SAID PISTON AT ITS FORWARD END TO SAID SHANK TO FIRMLY HOLD THE PISTON AXIALLY AGAINST SAID PISTON ROD.