Round tray

• US 4,124,160 A
• Filed: 07/29/1977
• Issued: 11/07/1978
• Est. Priority Date: 07/29/1977
• Status: Expired due to Term

• Current Assignee: James River Paper Company, Inc. (KOCH Industries Incorporated)
• Original Assignee: American Can Co (Citigroup Incorporated)
• Inventors: Meyers, George L., Webb, Russell R.
• Primary Examiner(s): Moorhead, Davis T.
• Application Number:
  US05/820,315
• Time in Patent Office: 466 Days
• Field of Search: 229/1.5 B, 229/21, 229/31, 229/8
• US Class Current: 229/4.5
• CPC Class Codes: B65D 5/2019 with at least partially curved edges or the like

Abstract

A round tray and a blank for making the tray. The tray has a bottom panel, a plurality of intermediate panels symetrically disposed about the center of the bottom panel, and a plurality of upstanding panels to form the sides of the tray. The upstanding panels may be tilted slightly outward in a conical shape to cause the diameter of the top of the tray to be slightly larger than the diameter of the bottom of the tray. Alternate ones of the upstanding panels are positioned on the inside of the tray, and their adjacent upstanding panels have circumferentially extending glue flaps which overlap the inner panels. The total number of upstanding panels and the total number of intermediate panels are equal, with each upstanding panel being foldable relative to an intermediate panel immediately below it about a first set of fold or score lines. The intermediate panels, in turn, are folded upward from the horizontal about a second set of fold or score lines. The boundaries of the intermediate panels are each formed by a score line from the first set and a score line from the second set of score lines, the first and second score lines of a particular panel coming together at points on the edges of the intermediate panel and on the edges of the upstanding panels. A point of intersection of the first and second score lines which define the edges of an intermediate panel is also the point of intersection for the first and second score lines of the next adjacent intermediate panel. Those points of intersection are formed on a circle about the center of the base panel but elevated slightly above the plane of the base panel.

Claims

1. A blank for a round tray comprising:

a bottom panel whose boundary is defined by a plurality of points of equal radii, R, from the center of said panel and uniformly distributed circumferentially about said center and by a first set of score lines in the form of arcs of circles, having radii r₁, whose centers are positioned outward from said first set of score lines on radii extending from the center of said bottom panel, said score lines of said first set connecting adjacent said points;

a plurality of intermediate panels between said points and equal in number to said points, the boundary of each said intermediate panel being defined on the bottom by one of said first set of score lines and on the top by a score line from a second set of score lines in the form of arcs of circles, having radii r₂, whose centers are positioned inward from said second set of score lines on radii extending from the center of said bottom panel, the score lines of said second set of score lines connecting said adjacent points;

r₁ and r₂ being defined by the following equations ##EQU2## wherein n is the number of intermediate panels,

b is the elevation angle of each intermediate panel relative to the bottom panel,

a is the complementary angle of b; and

a plurality of wall panels whose boundaries are defined on the bottom by a score line of said second set of score lines.

2. A blank as recited in claim 1 in which

a = b = 45 degrees, n = eight, and r₁ = r₂.

3. A round tray made from the blank of claim 2.