Building board lifter

Claim 1

A BUILDING BOARD LIFTER, A MAIN CARRIAGE FOR ROTATABLY CARRYING AND SUPPORTING BUILDING BOARDS FROM A MAIN FRAME, A TILT LOCK LEVER MOUNTED ON SAID MAIN CARRIAGE FOR CONTROLLING ROTATION OF SAID MAIN CARRIAGE, AND MOVABLE IN AN ARCUATE DIRECTION, AND SLIDABLE SLEEVE MEANS ON SAID MAIN CARRIAGE HAVING A TILT LOCK LEVER TO ALLOW TILTING OF THE MAIN CARRIAGE TO A HORIZONTAL POSITION FROM A SUBSTANTIALLY VERTICAL POSITION WHEN SAID SLEEVE IS DISPLACED ALONG A PORTION OF THE MAIN CARRIAGE, AND A WINDING CABLE AND CABLE DRUM ASSEMBLY DISPOSED ON SAID MAIN FRAME AND CONNECTED TO THE MAIN CARRIAGE TO TURN THE MAIN CARRIAGE ON SAID TILT LOCK LEVER WHEN SAID SLEEVE IS DISPLACED FROM SAID SUBSTANTIALLY VERTICAL POSITION TO THE HORIZONTAL POSITION UPON RELEASE OF SAID SLIDABLE SLEEVE, SAID MAIN FRAME COMPRISING A HORIZONTALLY DISPOSED BASE MEMBER AND A PAIR OF UPSTANDING VERTICAL MEMBERS SUPPORTED THEREFROM, AND SAID CARRIAGE BEING SUPPORTED FROM SAID MAIN FRAME BY AN INTERMEDIATE CARRIAGE WHICH RAISES AND LOWERS SAID CARRIAGE ASSEMBLY BY A CABLE AND CABLE DRUM ARRANGEMENT MOUNTED FROM THE VERTICAL COMPONENTS OF SAID MAIN FRAME, THE TILT LOCKING LEVER INCLUDING A LOCKING ARM AND A CLAMP FOR ALLOWING THE MAIN CARRIAGE TO BE PIVOTALLY MOUNTED AND MOVABLE FROM ITS HORIZONTAL POSITION TO ITS SUBSTANTIALLY VERTICAL POSITION.