Book folder with cushioning end

Claim 1

A book folder end closure for a book folder having a bottom panel, a first side wall panel, a top panel, and a second side wall panel secured in tubular relation, the bottom panel having an extension flap end structure, a rectangular end wall secured to the center portion of said bottom panel along a line of fold terminating short of the side edges of said bottom panel, a substantially rectangular cushioning panel connected to said end wall along a fold line, said rectangular end wall extending upwardly and inwardly from the end of said bottom panel at an acute angle thereto, said cushioning panel extending downwardly into edge abutting contact with said bottom panel and at substantially right angles thereto, said end wall cushioning panel, and bottom panel forming a hollow right triangular cushioning member, isosceles triangles having their bases foldably connected to the sides of said end wall, the distance between the apexes of said isosceles triangles being greater than the width of said bottom panel so as to lie in vertical planes through the side walls and against said side walls, fold lines extending angularly from the ends of said line of fold connecting said end wall to said bottom wall to the ends of the fold lines connecting said bottom panel to said side wall panels, said fold line connecting said bottom panel to said end walls being located beyond the ends of the fold lines connecting said bottom panel to said side walls, triangular flaps between said angularly extending fold lines and one equal length side of said isosceles triangles whereby the one side of said isosceles triangles extend on substantially a vertical plane through the fold line connecting said bottom panel to said end wall, extension fold lines aligned with said the fold line connecting said end wall to said cushioning flap extending across said said extension flap structure, right triangular flaps between said extension fold lines and the other equal length sides of said isosceles triangles, said right triangular flaps extending parallel to said bottom panel and underlying said top panel, and the portions of said extension flap structure beyond said extension fold lines and connected to said cushioning panel extending downwardly into edge contact with said bottom panel.