Half slotted container lid with self-locking double side panels

A lid for a container comprising

• a top wall,
• a pair of spaced side walls and a pair of spaced end walls, said side and end walls being in adjacent relationship,
• each said side and end walls being formed from inner and outer panels joined to each other at their sides along a longitudinal fold line, and joined to each other at their ends at a lateral fold-line to define the corner of said lid, each of the inner panels having a diagonal fold-line extending interiorly of the panel and intersecting said lateral fold-line, the diagonal fold-lines between adjacent inner panels having an included angle of 90 degrees.
• said inner panels being connected continuously and folded inwardly about said longitudinal fold-line to form a two-ply perimeter wall of said lid,
• the diagonal fold-lines and lateral fold-line at the ends of the inner panels providing a hinged joint for locking said inner panels in place such that the inner panels bow inwardly toward the center of the lid.

A corrugated paper container for packing produce comprising

• an open-topped box comprised of bottom, side and end walls,
• a lid for said box having a top wall and integral perimeter comprised of side and end walls depending therefrom to fit telescopically over the open end of said box,
• said side and end walls of the lid being two-ply comprised of inner and outer panels, the outer panels being hingedly connected to the top wall and the inner panels being hingedly connected to the outer panels at a perimeter fold-line, said inner panels being folded inwardly about said perimeter fold-line,
• each of the inner panels having a hinged connection to the adjacent panel at a panel fold-line, the panel fold-line forming the inner corner of the lid perimeter wall,
• scored diagonal fold-lines radiating outwardly at the ends of each panel from the intersection of said perimeter fold-line and the panel fold-line, the included angle between said diagonal fold-lines being 90 degrees, the inwardly folded inner panels of said perimeter wall of the lid being locked at the corners by said diagonal folds and said inwardly folded panels being bowed inwardly of the lid perimeter whereby the bowed inner panels engage the side walls of the box and securely hold the lid on the box against the side walls of the box and reinforce said side walls against bulging outwardly.

A foldable blank of corrugated paperboard material having two sets of hingedly connected panels and plural flaps for erecting a box lid having a two-ply perimeter side wall,

• the plural flaps each hingedly connected to the first set of panels along a longitudinal fold-line,
• the second set of panels hingedly connected to said first set of panels along a second longitudinal fold-line parallel to said first longitudinal fold-line,
• the individual panels of said first set and of said second set being hingedly connected to each other along panel fold lines perpendicular to said longitudinal fold lines,
• and a pair of diagonal fold-lines in each of said panels of said second set radiating to the edge of the panel from the intersection of said second longitudinal fold-line and the panel fold-line, said diagonal lines of said pair extending at right angles to each other.