Mobile foldable bleacher

Claim 1

A TRUCK ATTACHABLE TO A FOLDABLE BLEACHER OR THE LIKE TO RENDER THE BLEACHER MOBILE, COMPRISING A RECTANGULAR TRUCK FRAME HAVING FLOOR ENGAGING WHEELS THEREON, A PAIR OF LATERALLY SPACED PARALLEL SEPARATELY MOVABLE LIFT PLATES MOUNTED ON THE FRAME FOR ELEVATION RELATIVE THERETO, MEANS FOR CONNECTING THE LIFT PLATES TO A FOLDABLE BLEACHER, A PAIR OF LATERALLY SPACED PARALLEL TRACKS ON THE FRAME BENEATH THE LIFT PLATES RESPECTIVELY, A PAIR OF UPWARDLY INCLINED LINKS BETWEEN EACH TRACK AND ASSOCIATED LIFT PLATE SPACED IN A FRONT TO REAR DIRECTION, EACH LINK HAVING AN UPPER END PIVOTED ON THE LIFT PLATE AND HAVING A ROLLER ON THE LOWER END THEREOF BEARING ON THE TRACK, A PULLEY ROTATABLE ON THE FRAME ADJACENT EACH TRACK INTERMEDIATE OPPOSITE ENDS OF THE ADJACENT LIFT PLATE, A PAIR OF CONNECTING RODS PIVOTALLY CONNECTED ECCENTRICALLY TO EACH PULLEY AND PIVOTALLY CONNECTED RESPECTIVELY TO THE ASSOCIATED LINKS SO THAT ROTATION OF THE PULLEY MOVES THE LINKS TOWARD UPRIGHT POSITIONS TO ELEVATE THE LIFT PLATES, A CABLE ATTACHED TO EACH PULLEY FOR TURNING THE PULLEY, A MANUALLY OPERABLE SCREW AXIALLY RETAINED ON THE FRAME BETWEEN THE TRACKS AND ROTATABLE ON THE FRAME ABOUT AN AXIS PARALLEL TO THE TRACKS, A NUT THREADED ON THE SCREW AND SLIDABLY MOUNTED ON THE FRAME, AND LINKS CONNECTING THE NUT TO THE CABLES SO THAT ROTATION OF THE SCREW ELEVATES THE LIFT PLATES.