Latch for back of walk-over seat

Claim 1

IN A WALK-OVER SEAT COMPRISING: FRAME MEANS INCLUDING A PAIR OF SPACED FRAME SIDES; A SEAT CUSHION HAVING A FIRST END AND A SECOND END EACH EXTENDING BETWEEN SAID FRAME SIDES; SAID FRAME MEANS INCLUDING MEANS FOR SUPPORTING SAID SEAT CUSHION IN AN OCCUPANT-ACCOMMODATING POSITION; A PAIR OF UPWARDLY EXTENDING LEVERS EACH HAVING A LOWER PORTION LOCATED ADJACENT ONE OF SAID FRAME SIDES; MEANS MOUNTING THE LOWER PORTIONS OF EACH OF SAID LEVERS FOR PIVOTAL MOVEMENT ABOUT A RESPECTIVE AXIS EXTENDING HORIZONTALLY BETWEEN THE LOWER PORTION OF A RESPECTIVE LEVER AND SAID ONE FRAME SIDE; MEANS PIVOTALLY CONNECTING TOGETHER AN UPPER PORTION OF EACH OF SAID LEVERS, WHEREBY THE LEVERS TOGETHER MAY BE PIVOTALLY MOVED BETWEEN A FIRST TERMINAL POSITION IN WHICH SAID UPPER PORTIONS ARE AT THE FIRST END OF SAID SEAT CUSHION AND A SECOND TERMINAL POSITION IN WHICH THE UPPER PORTIONS ARE AT THE SECOND END OF THE SEAT CUSHION; AND MEANS FOR PREVENTING REMOVAL OF THE SEAT CUSHION FROM ITS OCCUPANT-ACCOMMODATING POSITION WHEN THE LEVERS ARE IN THEIR FIRST OR SECOND POSITION AND FOR PERMITTING REMOVAL OF THE SEAT CUSHION WHEN THE LEVERS ARE IN A PREDETERMINED INTERMEDIATE POSITION LOCATED BETWEEN SAID FIRST AND SECOND TERMINAL POSITION; THE IMPROVEMENT COMPRISING MANUALLY OPERABLE MEANS FOR RETAINING THE LEVERS IN SAID PREDETERMINED INTERMEDIATE POSITION, SAID MANUALLY OPERABLE RETAINING MEANS COMPRISING: AN ELEMENT; MEANS CONNECTED TO SAID ONE FRAME SIDE MOUNTING SAID ELEMENT FOR SLIDABLE MOVEMENT, IN THE DIRECTION OF SAID HORIZONTALLY EXTENDING AXES, BETWEEN ONE POSITION RELATIVELY CLOSE TO SAID LEVERS AND ANOTHER POSITION RELATIVELY DISTANT FROM SAID LEVERS; SAID ELEMENT INCLUDING LATCH MEANS LOCATED TO ENGAGE ONE OF SAID LEVERS WHEN THE LEVERS ARE IN SAID INTERMEDIATE POSITION AND SAID ELEMENT IS IN SAID RELATIVELY CLOSE POSITION; AND MEANS NORMALLY OPERABLE TO URGE SAID ELEMENT TO SAID RELATIVELY DISTANT OPOSITION WHEREIN THE LATCH MEANS OCCUPIES A LOCATION AT WHICH THE LATCH MEANS IS INCAPABLE OF ENGAGING A LEVER; SAID ONE LEVER INCLUDING MEANS FOR HOLDING SAID ELEMENT AGAINST THE URGING OF SAID NORMALLY OPERABLE MEANS, RELEASABLE IN RESPONSE TO MOVEMENT OF SAID ONE LEVER TOWARD ONE OF SAID TERMINAL POSITIONS, WHEN THE ONE LEVER ENGAGES SAID LATCH MEANS.