Extensible mounting apparatus for hoists

Claim 1

AN INDUSTRIAL TRUCK COMPRISING A HORIZONTAL WHEEL SUPPORTED U-SHAPED FRAME, OUTRIGGER LEGS OF SAID FRAME EXTENDING LONGITUDINALLY FORWARDLY IN PARALLEL SPACED RELATION TO EACH OTHER AND HAVING CHANNEL SECTIONS OPENING INWARDLY IN FACING RELATION TO EACH OTHER, A REAR TRANSVERSE FRAME PORTION CONNECTING TOGETHER THE REAR ENDS OF SAID OUTRIGGER LEGS TO FORM SAID U-SHAPED FRAME, THE FORWARD PORTION OF SAID OUTRIGGER LEGS BEING OF SUBSTANTIALLY LESS HEIGHT THAN SAID REAR ENDS THEREOF FOR FACILITATING ENTRY OF SAID FORWARD PORTIONS BENEATH LOW HEIGHT LOAD SUPPORTING PALLETS AND THE LIKE, UPWARDLY EXTENDING LOAD LIFTING MEANS MOUNTED WITHIN THE POCKET FORMED BY THE U-SHAPED FRAME FOR MOVEMENT LONGITUDINALLY THEREOF, A PAIR OF MOUNTING MEANS OF SUBSTANTIALLY LESS LENGTH THAN THE CHANNEL SECTIONS OF THE OUTRIGGER LEGS NESTED WITHIN THE RESPECTIVE CHANNEL SECTIONS OF THE LEG OF SAID FRAME, EACH MOUNTING MEANS INCLUDING RELATIVELY CLOSELY VERTICALLY SPACED UPPER AND LOWER FLANGE MEMBERS NESTED WITHIN ONE OF THE CHANNEL SECTIONS AND EXTENDING LONGITUDINALLY THEREOF, AN ENDLESS LOOP OF LINKED ROLLER CHAIN MOUNTED FOR REVOLUTION LONGITUDINALLY OF EACH FLANGE MEMBER AND ADAPTED TO TRANSMIT FORCES IMPOSED ON THE LIFTING MEANS TO THE RESPECTIVE CHANNEL SECTION, A PLURALITY OF ROLLERS IN EACH SAID ROLLER CHAIN BEING ADAPTED TO DIVIDE AND DISTRIBUTE TO THE RESPECTIVE CHANNEL SECTION THE TOTAL FORCE TRANSMITTED THEREBY, THE UPPER ROLLER CHAIN BEING ADAPTED TO TRANSMIT AN UPWARDLY DIRECTED FORCE TO EACH UPPER PORTION OF THE CONTIGUOUS CHANNEL SECTION AND THE LOWER ROLLER CHAIN BEING ADAPTED TO TRANSMIT A DOWNWARDLY DIRECTED FORCE TO THE LOWER PORTION OF SAID CHANNEL SECTION, SAID CHAIN OF ROLLERS WHICH IS LOOPED LONGITUDINALLY OF EACH FLANGE MEMBER BEING REVOLVABLE AROUND THE FLANGE MEMBER IN A DIRECTION OPPOSITE TO THE DIRECTION OF REVOLUTION OF THE COOPERATING CHAIN OF ROLLERS DURING MOVEMENT OF THE LOAD LIFTING MEANS LONGITUDINALLY OF THE FRAME AND EACH ROLLER OF SUCH ROLLER CHAIN BEING REVOLVABLE ABOUT ITS OWN AXIS, EACH ROLLER OF SAID ROLLER CHAIN BEING OF RELATIVELY SMALL DIAMETER TO FACILITATE THE USE OF SAID RELATIVELY LOW HEIGHT FORWARD PORTIONS OF SAID OUTRIGGER LEGS, A LONGITUDINALLY EXTENDING GENERALLY L-SHAPED BRACKET MEANS CONNECTED TO BOTH UPPER AND LOWER FLANGE MEMBERS OF EACH MOUNTING MEANS TRANSVERSELY INWARDLY OF THE MOUNTING OF THE ROLLER CHAINS THEREON AND SECURED TO OPPOSITE SIDES OF SAID LOAD LIFTING MEANS FOR SUPPORTING SAID LOAD LIFTING MEANS ON SAID MOUNTING MEANS FOR MOVEMENT LONGITUDINALLY OF SAID OUTRIGGER LEGS, MEANS FOR ACTUATING THE LOAD LIFTING MEANS AND MOUNTING MEANS LONGITUDINALLY OF SAID OUTRIGGERR LEGS, AND A PAIR OF RELATIVELY LARGE DIAMETER TRUCK SUPPORT WHEELS MOUNTED AT THE FORWARD ENDS OF SAID OUTRIGGER LEGS.