Wedge-type stack leveling platform for sheet material

Claim 1

A STACK LEVELING UNIT FOR A STACK OF SHEET MATERIAL COMPRISING A HORIZONTALLY ELONGATED BODY FOR USE AS A SUPPORT, SAID BODY INCLUDING A PAIR OF VERTICALLY EXTENDING HORIZONTALLY ELONGATED SIDE WALLS DISPOSED IN LATERALLY SPACED RELATION AND PROVIDING A HORIZONTAL TOP SUPPORT SURFACE, HORIZONTALLY EXTENDING SUPPORT MEANS DISPOSED BETWEEN SAID SIDE WALLS, A LIFT ELEMENT MOVABLY MOUNTED UPON SAID BODY FOR MOVEMENT BETWEEN A RETRACTED POSITION FLUSH WITH AND AN EXTENDED POSITION PROJECTING ABOVE SAID SUPPORT SURFACE, ACTUATING MEANS CONNECTED TO SAID LIFT ELEMENT AND OPERABLE TO MOVE THE LATTER BETWEEN SAID RETRACTED AND EXTENDED POSITIONS, SAID ACTUATING MEANS INCLUDING AN ACTUATOR SLIDABLY RESTING UPON SAID SUPPORT MEANS BETWEEN SAID SIDE WALLS AND MOVABLE LONGITUDINALLY OF SAID BODY, SAID ACTUATOR AND SAID LIFT ELEMENT HAVING COOPERATING WEDGE SURFACES, AN OPERATING MEMBER CONNECTED TO SAID ACTUATOR AND EFFECTING SLIDING MOVEMENT OF THE LATTER UPON SAID SUPPORT MEANS.