Folding bleacher

Claim 1

IN A SEATING STRUCTURE, A PLURALITY OF TRANSVERSE FRAMES OF SUCCESSIVELY DECREASING HEIGHTS, SAID FRAMES BEING RETRACTABLE IN NESTED RELATION WITHIN AND BELOW THE NEXT TALLER FRAME AND SUCCESSIVELY EXTENSIBLE THEREFROM, A LATCH MOVABLY MOUNTED TO EACH FRAME EXCEPT THE LOWEST FRAME, AN ABUTMENT ON EACH FRAME EXCEPT THE TALLEST FRAME ENGAGING THE LATCH ON THE NEXT TALLER FRAME WHEN THE FRAMES ARE EXTENDED SO AS TO PREVENT RETRACTION, MEANS HINGED TO THE LOWEST FRAME AND MOVABLE WITHIN LIMITS, MEANS OPERATIVELY INTERCONNETING THE SAID HINGED MEANS WITH THE LATCH ON THE NEXT TALLER FRAME FOR MOVING THE SAID LATCH OUT OF LOCKING RELATION TO THE ABUTMENT ON SAID LOWER FRAME UPON MOVEMENT OF SAID HINGED MEANS TO ONE OF SAID LIMITS, TOGGLE INTERCONNECTING EACH PAIR OF ADJACENT FRAMES, AND MEANS ENGAGEABLE BY SAID TOGGLES TO MOVE SAID OTHER LATCHES OUT OF LOCKING RELATION TO THEIR ASSOCCIATED ABUTMENTS AS THE FRAMES ARE SEQUENTIALLY RETRACTED, THE RETRACTION OF EACH FRAME CONDITIONING THE NEXT TALLER FRAME FOR RETRACTION BY UNLOCKING THE LATCH NORMALLY HOLDING SAID NEXT TALLER FRAME.