Plural rotary actuators

Rotary actuator (1) comprising a housing (2) having end walls, said housing defining a working chamber (3) for actuation with a pressure fluid, the working chamber having an at least partially circular section bounded by an inner wall (4), sides and two end positions, a pivoting piston (5) having an axis (X), the piston being arranged sealingly against the inner wall (4) of and pivotable between the two end positions of the working chamber, characterized in that the pivoting piston (5) being pivotally supported in bearings (16) which are arranged in the housing (2) axially at each said side of the working chamber (3), the piston comprising means for cooperation with an external rotary shaft, whereby the housing (2) on at least one of its end walls is adapted so as to be contacted against and be fixedly fastened to a corresponding end wall of a second rotary actuator housing (2), and whereby these housings are fixable to one another in such a way that the axes (X) of the pivoting pistons of the respective housings are coaxial and that the pivoting pistons thereby are capable of affecting a common outgoing shaft, each housing (2) being divided through its working chamber (3) perpendicular to its axis (X) into housing parts, the housing parts being fixed together by tubular rivets (13) having rivet axes parallel with said axis (X), said rivets having through holes inside the tubular rivets (13) for receiving fastening means for mutual fastening of the housing, said tubular rivets (13) being distributed around and outside the working chambers in such a way that to allow the housings to be fastened together.