Tray with reinforced walls

Claim 1

In a tray type folding carton formed from a unitary blank of foldable sheet material such as paperboard, the combination of: a. a bottom wall having opposed pairs of side and end walls foldably joined to and upstanding from opposed side and end edges thereof, and foldably joined to each other to form a box-like structure open at the top; b. gusset means at each corner of said carton, each including a pair of generally triangular gusset panels foldably joined to each other and to respective end edges and side edges of adjacent side and end walls and folded into face-to-face engagement with inner surfaces of said end walls; c. said side walls each including an outer panel foldably joined at its lower edge to a side edge of said bottom wall and an inner panel foldably joined at one edge to an upper edge of said outer panel and being folded inwardly and downwardly into face-to-face engagement with said outer panel; c. said end walls each including: i. an outer panel foldably joined at its lower edge to an end edge of said bottom wall; ii. an inner panel of substantially less height than the height of said end wall outer panel, foldably joined at one edge to an upper edge of said end wall outer panel and folded inwardly and downwardly to overlie an upper marginal portion of said end wall outer panel; iii. an intermediate panel foldably joined at one edge to a lower edge of said end wall inner panel and folded outwardly and upwardly to lie between said end wall outer and inner panels to provide reinforcement for said end wall and thereby minimize bowing thereof. e. means forming an interlocking connection between adjacent side and end walls at the corners of said carton.