Hydraulic rodless cylinder type actuator

A hydraulic rodless cylinder type actuator comprising:

• a hydraulic cylinder;
• a piston fluid-tightly received in said cylinder and movable along an axis of said cylinder;
• housing elements respectively mounted on opposite ends of said cylinder;
• a first output shaft and a second output shaft respectively accommodated in said housing elements, and protruding from said housing elements in a fluid-tight condition, and extending perpendicularly to and spaced from an axis of said cylinder;
• a first inner sprocket and a second inner sprocket respectively affixed to said first and second output shafts within the respective housing elements;
• a first outer sprocket and a second outer sprocket respectively affixed to said first and second output shafts;
• a first inner chain and a second inner chain respectively anchored at one end to opposite sides of said piston, with each of said first and second inner chains being left free at the other end so as to form a free end portion, while having an intermediate portion thereof passed over a corresponding one of said first and second inner sprockets, and having a length great enough to extend in parallel to said cylinder;
• chain cases respectively fluid-tightly communicated to said housing elements, and for respectively receiving and guiding said free end portions of said first and second inner chains between a position where said free end portions of said first and second inner chains leave the respective first and second inner sprockets and a position where said free end portions of said first and second inner chains extend in parallel to said cylinder;
• and
• an outer chain passed over said first and second outer sprockets outside of said housing elements.