Device for translating axial motion into swinging motion

Claim 1

IN COMBINATION WITH A MAST, A JIB, AND A KNUCKLE MEMBER BY WHICH ONE END OF THE JIB IS JOURNALLED ON THE MAST FOR LATERAL SWINGING MOTION IN OPPOSITE DIRECTIONS ABOUT THE MAST AXIS, HYDRAULICALLY ACTUATED MEANS FOR IMPARTING SWINGING MOVEMENT TO THE JIB, COMPRISING: A PAIR OF HYDRAULIC OPERATORS EACH HAVING RELATIVELY AXIALLY EXTENSIBLE AND RETRACTABLE ELEMENTS; MEANS MOUNTING SAID OPERATORS ON THE MAST WITH THEIR AXIS TRANSVERSE TO THAT OF THE MAST, AND WITH ONE ELEMENT OF EACH OPERATOR CONSTRAINED TO ROTARY MOVEMENT ABOUT THE MAST AXIS SO THAT THE OUTER END PORTION OF THE OTHER ELEMENT OF EACH OPERATOR IS MOVABLE TOWARD AND FROM THE MAST AXIS IN CONSEQUENCE OF ITS RETRACTION AND EXTENSION; AND A PAIR OF LINKS FOR EACH OPERATOR, EACH OF THE LINKS OF EACH PAIR HAVING ONE END PIVOTALLY CONNECTED TO THE OUTER END PORTION OF THE EXTENSIBLE AND RETRACTABLE ELEMENT OF THE OPERATOR, THE OPPOSITE END OF THE LINK OF EACH PAIR BEING PIVOTALLY CONNECTED TO THE KNUCKLE MEMBER AT A FIXED DISTANCE FROM THE MAST AXIS, AND THE OPPOSITE END OF THE OTHER LINK OF EACH PAIR BEING PIVOTALLY CONNECTED TO A PART WHICH IS FIXED WITH RESPECT TO THE MAST AND SPACED FROM ITS AXIS AND ALL OF SAID PIVOTAL CONNECTIONS HAVING THEIR AXES PARALLEL TO THAT OF THE MAST; THE LINKS OF EACH PAIR THEREOF NORMALLY EXTENDING TO OPPOSITE SIDE OF THE AXIS OF THEIR OPERTOR IN DIVERGENT RELATIONSHUP TO ONE ANOTHER, AND THE ANGLE OF DIVERGENT OF ONE PAIR OF SAID LINKS BEING INCREASED, AND THE ANGLE OF DIVERGENCE OF THE OTHER PAIR OF LINKS BEING SIMULTANEOUSLY DECREASED IN CONSEQEUNCE OF EXTENSION OF ONE OF THE EXTENSIBLE AND RETRACTABEL ELEMENTS CONCURRENTLY WITH RETRACTION OF THE OTHER, TO THUS SMOOTHLY TRANSLATE SUCH CONCURRENT ACTAUTION OF THE OPERATORS INTO SWINGING MOVEMENT OF THE JIB.