Cardboard trays

• US 4,305,543 A
• Filed: 02/01/1980
• Issued: 12/15/1981
• Est. Priority Date: 02/01/1980
• Status: Expired due to Term

• Current Assignee: Tsu-Yu Lai
• Original Assignee: Tsu-Yu Lai
• Inventors: Lai, Tsu-Yu
• Primary Examiner(s): Moorhead, Davis T.
• Application Number:
  US06/117,579
• Time in Patent Office: 683 Days
• Field of Search: 229/32, 229/34
• US Class Current: 229/163
• CPC Class Codes: B65D 5/2033 polygonal having more than four sides, e.g. hexagonal, octogonal
• CPC Class Codes: B65D 5/2095 a part of the folded-up portions defining an inwardly folded ledge at the edges of the central panel
• CPC Class Codes: B65D 5/22 held erect by extensions of one or more sides being doubled-over to enclose extensions of adjacent sides

Abstract

An improved construction for cardboard trays made from a single cardboard blank, in which the side panels are held in position by tabs formed around the outer corners of one of two adjacent side panels, where the tabs are folded over to enfold the edge or edges of the neighboring side panel having flaps formed on and folded inwardly therefrom.

Claims

1. A cardboard tray formed of a single blank suitably cut and scored, comprising:

a bottom panel;

two pairs of symmetrically opposed upfolding side panels formed around said bottom panel;

right triangular flaps formed on the sides of one pair of opposed side panels with the hypotenuse of the flap extending outwardly and upwardly from the corresponding side and one leg of said triangle being colinear with an outer edge of a corresponding side panel so the flaps can be folded inwardly to overlap the inner surface of the adjacent side panels;

tabs formed around the outer corners of the second pair of opposed side panels, each of said tabs forming three-quarters of a square with said outer corners forming the remaining quarter of each square, each tab being divided into said quarters by two score lines which extend diagonally across each tab to divide said tab into three equilateral triangles, each of said scorelines being colinear with one edge of said outer corner, one edge of said tab being parallel with and spaced from a hypotenuse of an adjacent flap so that each tab will fold first around the previously folded outer surface of the adjacent side panels and flaps, and second over the upper edge and theredown across the inner surface of the side panels and flaps;

said tabs thus enfolding both the outer and inner surface of the adjacent side panels and flaps; and

a trapezoidal interim panel formed in between each side panel and said bottom panel, the non-parallel sides of adjacent interim panels being colinear with each other to form an edge extending between a tap and a flap at right angles to said tab and flap, said interim panels being folded flush with the bottom panel to form a flange around the bottom panel outside the side panels, said flange being provided with a polygonal notch formed on a mid-position of each side thereof.

2. An octagonal cardboard tray formed of a single blank suitably cut and scored, comprising a bottom panel, two pairs of symetrically opposed upfolding side panels;

one pair of said side panels being of single panel folded form and connected to the bottom panel, and a second pair being of three panel sections connected end to end with the central panel section folded from and connected to the bottom panel;

the end panel sections being inwardly folded along the end score lines of the central panel sections, the end panel sections being each provided with an end flap and a pair of infolding connecting flaps between the lower edge and the meeting side edge of the bottom panel, said end flaps being folded inwardly to overlap the inside surface of said single panels, said single panels each being provided with a tab having a lip parallel thereto, said tab being of same size as the single panel and folded inwardly over the flaps to abut on the inner side of said flaps, said lip being folded flush with the bottom panel with the end portions inserted in between the infolded connecting flaps;

the score line along which said lip is folded being provided with notches at the ends to receive the edges of one of the infolded connecting flaps to form a locking engagement.