Seat adjusting structure

Claim 1

IN AN ADJUSTABLE SEAT MECHANISM, IN COMBINATION, (A) A BRACKET ADAPTED TO BE MOUNTED ON SUPPORT STRUCTURE, (B) AN ELONGATED, INNER TRACK MOUNTED ON SAID BRACKET, SAID TRACK BEING OF A SUBSTANTIALLY RECTANGULARLY CROSS SECTION HAVING SUBSTANTIALLY PARALLEL UPPER AND LOWER WALLS AND SPACED SIDE WALLS INTERCONNECTING SAID UPPER AND LOWER WALLS, (C) AN ELONGATED BRACKET CONNECTING PORTION LATERALLY CENTRALLY DEFINED ON SAID LOWER WALL AND SUBSTANTIALLY PERPENDICULAR THERETO, (D) AN ELONGATED, TUBULAR SEAT FRAME CARRIAGE SLIDABLY MOUNTED ON AND CIRCUMSCRIBING SAID INNER TRACK, SAID CARRIAGE BEING OF A SUBSTANTIALLY RECTANGULAR CROSS SECTION HAVING AN UPPER WALL, A BOTTOM WALL AND SPACED SIDE WALLS INTERCONNECTING SAID UPPER AND BOTTOM WALLS, (E) ANTIFRICTION ROLLER MEANS INTERPOSED BETWEEN AND DISPOSED IN ENGAGEMENT WITH SAID UPPER WALL OF SAID CARRIAGE AND SAID UPPER WALL OF SAID INNER TRACK, (F) SAID CARRIAGE BOTTOM WALL BEING SUBSTANTIALLY PARALLEL TO AND DISPOSED ADJACENT SAID TRACK LOWER WALL, AND (G) AN ELONGATED, CENTRALLY LOCATED SLOT DEFINED IN SAID CARRIAGE BOTTOM WALL, SAID BRACKET CONNECTING PORTION EXTENDING THROUGH SAID SLOT.