Fluid actuated structure

Claim 1

A FLUID ACTUATOR COMPRISING: (A) AN ELONGATED TUBULAR HOUSING BODY DEFINING AN INTERNAL OPEN ENDED ACTUATION CHAMBER; (B) ENDS CAPS FIXED TO THE BODY AND CLOSING THE ENDS OF THE CHAMBER; (C) BEARINGS CARRIED BY THE CAPS IN SAID CHAMBER; (D) A SHAFT JOURNALED IN BEARINGS AND EXTENDING THROUGH THE CHAMBER, THE SHAFT PROJECTING THROUGH THE END CAPS; (E) A RECIPROCAL PISTON MEANS AROUND THE SHAFT AND CONNECTED TO THE BODY AND SHAFT FOR CAUSING RELATIVE ROTATION OF THE SHAFT AND BODY AND PISTON RECIPROCATION TO OCCUR SIMULTANEOUSLY; (F) EACH CAP INCLUDING A FLUID PORT OUTWARDLY OF THE BEARING CARRIED BY THE CAP AND COMMUNICATING WITH THE CHAMBER THROUGH THE BEARING CARRIED BY THE CAP; (G) FLUID MEANS CONNECTED TO A PORT FOR SELECTIVELY INTRODUCING FLUID UNDER PRESSURE THROUGH THE PORT AND THENCE THROUGH ONE OF THE BEARINGS INTO THE CHAMBER TO DRIVE THE PISTON.