Hoisting truck having boom means comprising a tension fulcrum bar

Claim 1

A PORTABLE HOIST WHICH COMPRISES: (1) A GENERALLY HORIZONTALLY DISPOSED BOOM, COMPRISING A MAIN PIPE HAVING A FULCRUM END AND AN OPEN, LOAD CARRYING END, SAID MAIN PIPE IN THE REGION OF SAID FULCRUM END BEING ADAPTED TO RECEIVE THE TOP END PORTION OF A FULCRUM BAR AND PIVOTAL CONNECTION MEANS THEREOF, SAID MAIN PIPE BETWEEN SAID ENDS HAVING ATTACHED THERETO A PAIR OF DOWNWARDLY EXTENDING MOUNTING BLOCKS, ONE ON ONE SIDE OF SAID MAIN PIPE, THE OTHER ON THE OTHER SIDE OF SAID MAIN PIPE WITH A ROUND MOUNTING SLEEVE DISPOSED BETWEEN SAID MOUNTING BLOCKS UNDERNEATH SAID MAIN PIPE WITH MEANS PIVOTALLY CONNECTING SAID MOUNTING SLEEVE TO SAID MOUNTING BLOCKS, SAID MAIN PIPE FURTHER COMPRISING A BRACE STRUCTURE ON THE TOP SIDE THEREOF; (2) A HYDRAULIC JACK COMPRISING A VERTICALLY DISPOSED HYDRAULIC CYLINDER HAVING A HYDRAULIC FLUID INLET IN THE REGION OF THE BOTTOM END THEREOF AND CONTAINING A PISTON BETWEEN SAID INLET AND THE TOP END THEREOF, A VERTICALLY DISPOSED LIFT ROD CONNECTED TO SAID PISTON AND EXTENDING FROM THE TOP SIDE OF SAID PISTON THROUGH THE TOP END OF SAID HYDRAULIC CYLINDER TO A CYLINDRICAL LIFT HEAD ABOVE SAID CYLINDER, THE AXIS OF SAID CYLINDRICAL LIFT HEAD BEING VERTICALLY DISPOSED, SAID MOUNTING SLEEVE BEING MOUNTED ON SAID LIFT HEAD, AND A VERTICALLY DISPOSED CYLINDRICAL SKIRT ATTACHED TO AND EXTENDING DOWNWARDLY FROM SAID LIFT HEAD AND SURROUNDING THE UPPER PORTION OF SAID HYDRAULIC CYLINDER, SAID HYDRAULIC JACK FUTHER COMPRISING A HYDRAULIC PUMP WITH HYDRAULIC FLUID RELEASE MEANS AND A HYDRAULIC FLUID OUTLET, AND HYDRAULIC FLUID HOSE MEANS HAVING ONE END COUPLED TO SAID OUTLET AND THE OTHER END COUPLED TO SAID HYDRAULIC FLUID INLET OF SAID OTHER END COUPLED (3) FRAME MEANC COMPRISING A BASE SUPPORTING SAID HYDRAULIC CYLINDER AT ITS BOTTOM END, UPRIGHT COLUMNS ON EACH OF SAID HYDRAULIC CYLINDER WITH THE BOTTOM ENDS THEREOF BEING ATTACHED TO SAID BASE, TOP PLATE MEANS ATTACHED TO THE TOP ENDS OF SAID UPRIGHT COLUMNS, SAID TOP PLATE MEANS HAVING AN OPENING THERETHROUGH FOR SAID CYLINDRICAL SKIRT, PAIRS OF FORWARDLY AND LATERALLY PROJECTING HORIZONTALLY DISPOSED ARMS SECUED TO THE OPPOSSITE OUTER SIDES OF SAID UPRIGHT COLUMNS, THE OTHER FASTENED TO THE OTHER UPRIGHT COLUMN, WHEEL MEANS ROTATABLY MOUNTED ON THE OUTER ENDS OF SAID ARMS, A CROSS BAR MEMBER ATTACHED TO THE INNER ENDS OF SAID FORWARLDY PROJECTING ARMS AND DISPOSED ON THE REAR SIDE OF SAID UPRIGHT COLUMNS, SAID CROSS BAR MEMBER COMPRISING BRACKET MEANS FOR RECEIVING THE BOTTOM END PORTION OF A FULCRUM BAR; AND (4) A FULCRUM BAR EXTENDING FROM SAID BRACKET MEANS TO THE PORTION OF SAID MAIN PIPE OF SAID BOOM ADAPTED TO RECEIVE THE TOP END PORTION OF SAID FULCRUM BAR, MEANS POVOTALLY CONNECTING THE BOTTOM END PORTION OF SAID FULCRUM BAR TO SAID BRACKET MEANS AND MEANS PIVOTALLY CONNECTING THE TOP END PORTION OF SAID FULCRUM BAR TO SAID MAIN PIPE.