Portable telescoping gymnasium seat units

Claim 1

A TELESCOPE BLEACHER COMPRISING A PLURALITY OF FRAMES RESPECTIVELY SIZED FOR INTERNESTED RELATION ONE WITHIN THE OTHER WHEN THE SEATING STRUCTURE IS FULLY TELESCOPED, RELEASABLE MEANS FOR LOCKING THE FRAMES IN THE FULLY TELESCOPED POSITION, MEANS CONNECTING SAID FRAMES FOR RELATIVE SHIFTING MOVEMENT FROM SUCH FULLY TELESCOPED POSITION INTO AN EXTENDED POSITION IN WHICH THE SEVERAL FRAMES ARE POSITIONED IN SUCCESSIVELY REARWARDLY SPACED RELATION TO EACH OTHER, FLOOR-CONTACTING MEANS MOUNTED ON THE LOWER ENDS OF SAID SEVERAL FRAMES, A PLURALITY OF VERTICALLY SHIFTABLE CASTERS DEPENDING FROM THE FRAMES AND BEING MOUNTED ON THE FRAMES FOR MOVEMENT THEREWITH, SHAFT MEANS OPERATIVELY MOUNTED ON AND EXTENDING BETWEEN A PLURALITY OF FRAMES IN PARALLELISM WITH THE LINE OF MOVEMENT OF THE FRAMES AS THEY SHIFT FROM FULLY TELESCOPED POSITION TO EXTEND POSITION, SAID SHAFT MEANS INCLUDING A PLURALITY OF SEPARABVLE SECTIONS RESPECTIVELY PROVIDED WITH INTERCONNECTING ELEMENTS WHICH ARE INTERENGAGED WHEN THE FRAMES ARE IN FULLY TELESCOPED POSITION AND ARE DISENGAGED WHEN THE FRAMES ARE IN EXTENDED POSITION, ACTUATING MEMBERS MOUNTED ON SAID SHAFT MEANS AND CONTACTING SAID CASTERS, LINK MEANS OPERATIVELY CONNECTING SAID SHAFT MEANS, AND A HYDRAULIC JACK MEANS HAVING AN ACTUATING ELEMENT OPERATIVELY CONNECTED TO THE LINK MEANS FOR TRANSMITTING MOTION TO THE LINK MEANS AND THEREBY BEING ADAPTED TO ROCK SAID SHAFT MEANS WHEN THE FRAMES ARE IN FULLY TELESCOPED POSITION WHEREBY TO CAUSE SAID ACTUATING MEMBERS TO APPLY DOWNWARD PRESSURE TO SAID CASTERS AND LIFT THE FRAMES AND FLOOR-CONTACTING MEANS UPWARDLY FROM THE FLOOR.