Transit vehicle seat

Claim 1

A transit seat comprising: a rotary cast, monolithic, hollow, plastic shell without voids and composed of a thermosetting, plastic material selected from the group consisting of cross linkable linear polyethylene, polycarbonate, polyvinylchloride and nylon; said shell being rotary cast from powder and having a thickness in the range 1/8 inch - 1/4 inch to permit rotary casting into the desired seat shape without creating voids and to permit accommodation in a rotary casting mold using powder as a starting material; a foamed polyurethane plastic material completely filling the interior of said shell, said interior being without voids; said foamed polyurethane having a density in the range 2.0 to 3.5 lbs. per cubic foot; said hollow plastic shell having a pebbled inner surface including bumps and indentations resulting from the rotary casting of said shell from powder; said foamed, polyurethane plastic material intimately surrounding said bumps and filling said indentations at said hollow surface; the combination of said hollow plastic shell and said foamed polyurethane interior having substantially greater strength, resistance to indentation and rigidity than said hollow plastic shell alone; a plurality of cushion sections; means removably mounting a first of said cusion sections in a first predetermined position on said shell; means mounting a second of said cushion sections in a second predetermined position on said shell; fastener means for securing said second cushion section against removal from said second predetermined position in the absence of a special tool; said fastener means being hidden from view by said second cushion section and said shell; and means on said first-recited mounting means and on the second cushion section cooperating to maintain the fIrst cushion section in said first predetermined position and to prevent its removal therefrom so long as the second cushion section is in the second predetermined position.