Hot gas servo system having rotary actuator

Claim 1

A ROTARY ACTUATOR COMPRISING IN COMBINATION: (A) A HOUSING HAVING MEANS DEFINING AN INTERNAL CHANBER; (B) A SHAFT ROTATABLY MOUNTED ON SAID HOUSING AND EXTENDING INTO SAID HOUSING; (C) A VANE CARRIED BY SAID SHAFT AND SEPARATING THE CHAMBER INTO TWO COMPARTMENTS; (D) A PAIR OF PRESSURIZABLE BELLOWS MEANS, EACH OF SPACED-APART DOUBLE-WALL CONSTRUCTION, RESPECTIVELY DISPOSED IN EACH OF SAID COMPARTMENTS, RESPECTIVELY OPERATIVE BETWEEN OPPOSITE SIDES OF SAID VANE AND SAID CHAMBER-DEFINING MEANS, EACH OF SAID BELLOWS MEANS RESPECTIVELY HAVING A BONDED CONNECTION TO ONE LATERAL SIDE OF SAID VANE INDEPENDENT OF THAT OF THE OTHER AND TO AN OPPOSED WALL OF SAID CHAMBER DEFINING MEANS; AND (E) A PAIR OF SEPARATE CONDUITS RESPECTIVELY COMMUNICATING THROUGH SAID OPPOSED WALLS WITH THE INTERIOR OF SAID BELLOWS MEANS, EACH COMPRISING THE SOLE FLUID COMMUNICATION THEREWITH, AND EACH ADAPTED TO BE CONNECTED TO A PRESSURIZED FLUID SOURCE.