Lifting sling for semi-trailers and demountable containers

Claim 1

LIFTING SLING COMPRISING A SUBSTANTIALLY RECTANGULAR FRAME HAVING SIDE MEMBERS AND END MEMBERS, GRAPPLING ARMS EXTENDING FROM THE SIDES OF SAID FRAME ADJACENT THE CORNERS THEREOF, MEANS MOUNTING EACH OF SAID GRAPPLING ARMS AT ONE END THEREOF FOR MOVEMENT ABOUT A FIRST PIVOT TRANSVERSE TO SAID SIDE MEMBERS AND A SECOND PIVOT NORMAL TO SAID FIRST PIVOT SO THAT SAID GRAPPLING ARMS ARE MOVABLE TO A POSITION EXTENDING SUBSTANTIALLY VERTICALY DOWNWARDLY FROM SAID FRAME THEREBY TO BE CAPABLE OF LIFTING A SEMI-TRAILER, SAID GRAPPLING ARMS FURTHER BEING MOVABLE BETWEEN A POSITION EXTENDING OUTWARDLY OF SAID END MEMBERS AS AN EXTENSION OF SAID SIDE MEMBERS AND A POSITION EXTENDING INWARDLY FROM SAID END MEMBERS IN OVERLYING RELATIONSHIP WITH SAID SIDES, FIRST AND SECOND ATTACHMENT MEANS SPACED LENGTHWISE OF SAID GRAPPLING ARMS FOR ATTACHMENT TO THE CORNERS OF A CONTAINER, SAID FIRST ATTACHMENT MEANS IN THE OUTWARDLY EXTENDING POSITION OF SAID GRAPPLING ARMS BEING CAPABLE OF LIFTING A CONTAINER OF PREDETERMINED LENGTH AND SAID SECOND ATTACHMENT MEANS IN THE INWARDLY EXTENDING POSITION OF SAID GRAPPLING ARMS BEING CAPABLE OF LIFTING A CONTAINER OF LESSER PREDETERMINED LENGTH THAN SAID FIRST MENTIONED CONTAINER.