Heavy duty container

Claim 1

An improved corner construction for a heavy duty shipping container having a tubular body and end closure means for closing the ends of said body wherein said body comprises: a. a pair of first and second tubes, formed from paperboard and adhesively secured to each other in telescoping relation, each of said tubes including five panels hingedly attached along parallel fold lines, wherein: i. each of the three center panels has a width corresponding substantially to the width of one of three walls of said body; ii. the two end panels have a combined width substantially equal to at least the width of the fourth wall of said body with one of said end panels being relatively wide and the other panel being relatively narrow; b. said tubes being disposed one within the other, with the three center panels of each tube positioned in face-to-face relation to provide double-ply thickness for said three walls of said body. c. said fourth wall of said body being double-ply in thickness throughout the majority of its width and having a joint section at one side thereof, adjacent one corner of said body which is triple-ply in thickness; d. said fourth wall having: i. one ply formed entirely from one of the wide end panels; ii. another ply formed from the other of the wide end panels and one of the narrow end panels having adjacent end edges forming a butt-joint; iii. a securing flap formed from the other narrow panel and extending from said corner beyond said butt-joint.