Weight transfer device for trailing vehicle

Claim 1

IN A TRAILING VEHICLE ADAPTED TO BE DRAWN BY AN AUTOMOBILE AFFORDING A DRAFT ELEMENT DISPOSED AT A PREDETERMINED ELEVATION, A RIGID FRAME INCLUDING A FORWARDLY PROJECTING TONGUE; MEANS INCLUDING A TRANSVERSE AXLE AND LATERALLY OPPOSED WHEELS ROTATABLY MOUNTED THEREON ADAPTING THE FRAME FOR EARTH TRAVERSING MOVEMENT; A BODY MEMBER HAVING WALL MEANS ADAPTED TO CONFINE A SUBSTANCE THEREWITHIN; MEANS MOUNTING THE BODY ON THE FRAME, TRAILER HITCH COUPLING MEANS ADAPTED FOR RELEASABLY CONNECTION WITH SAID DRAFT ELEMENT, INCLUDING A LONGITUDINALLY RIGID HITCH LINK AFFORDING LATERALLY OPPOSED REARWARDLY EXTENDED DRAFT ARMS; MEANS PIVOTALLY CONNECTING THE ARMS WITH SAID TONGUE IN TRANSVERSELY OVERLAPPING RELATION FOR RELATIVE MOVEMENT ABOUT A FIRST AXIS WITH THE TONGUE BEING POSITIONABLE THROUGH A RANGE OF MOVEMENTS HAVING OPPOSITE LIMITS OF TRAVEL RESPECTIVELY SPACED ABOVE AND BELOW THE DRAFT ARMS; PIVOT MEANS CARRIED BY SAID TONGUE AND AFFORDING A SECOND PIVOTAL AXIS FORWARDLY SPACED FROM SAID FIRST AXIS; PIVOT MEANS CARRIED BY SAID DRAFT ARMS AFFORDING A THIRD AXIS FORWARDLY SPACES FROM SAID TANK AXIS AND FROM SAID TONGUE AND ELEVATIONALLY SPACED FROM SAID SECOND AXIS; AN EXTENSIBLE LINK INTERCONNECTING THE RESPECTIVE PIVOT MEANS PROVIDING SAID SECOND AND THIRD AXES; AND MEANS TO EFFECT CONTROLLED EXENSIONS AND RETRACTION OF SAID EXTENSIBLE LINK WITH SAID PIVOT MEANS OF SAID TONGUE AND SAID ARMS ABUTTING EACH OTHER AT ONE LIMIT OF TRAVEL OF SAID TONGUE AND SPACED FROM EACH OTHER AT THE OTHER LIMIT OF TRAVEL SO THAT BOTH FORWARD AND REARWARD ROCKING MOVEMENT OF SAID FRAME AND SAID BODY IS SELECTIVELY PERMITTED ABOUT SAID AXLE.