Container lifting frame with means to shift same laterally on a forklift truck

Claim 1

IN COMBINATION WITH A SUBSTANTIALLY RECTANGULAR CONTAINER HAVING UPPER CORNER MEMBERS WITH HORIZONTAL WALLS AND OPENINGS THERETHROUGH AND LOWER CORNER MEMBERS WITH VERTICAL WALLS AND OPENINGS THERETHROUGH, AND A LIFT TRUCK INCLUDING A VERTICAL BOOM AND A SUBFRAME MOUNTED THEREON FOR MOVEMENT VERTICALLY ALONG SAID BOOM; MEANS TO LIFT SAID CONTAINER COMPRISING A FRAME SUBSTANTIALLY COEXTENSIVE WITH SAID CONTAINER, HORIZONTAL PINS EXTENDING FROM THE FRONT OF SAID FRAME ADJACENT ITS LOWER CORNERS AND ADAPTED TO ENTER SAID LOWER CONTAINER CORNER MEMBERS VIA THEIR OPENINGS, VERTICAL PINS EXTENDING DOWNWARDLY FROM SAID FRAME AT ITS FRONT ADJACENT ITS UPPER CORNERS AND ADAPTED TO ENTER SAID UPPER CONTAINER CORNER MEMBERS VIA THEIR OPENINGS, MEANS AT THE REAR OF SAID FRAME SLIDABLY MOUNTING SAID FRAME ON SAID SUBFRAME INCLUDING BEARING MEMBERS PIVOTALLY MOUNTED BETWEEN OPPOSED PORTIONS OF SAID FRAME AND SAID SUBFRAME, AND POWER MEANS TO EFFECT SLIDING MOVEMENT OF SAID FRAME RELATIVE TO SAID SUBFRAME.