초록 ▼

A strut improvement in an erectable carton of the shadow box type. The improved strut is provided from the carton material forming the carton blank which extends from a pair of corresponding non-common sides of two side-by-side panels which are retained in side-by-side relation as part of one pair o

A strut improvement in an erectable carton of the shadow box type. The improved strut is provided from the carton material forming the carton blank which extends from a pair of corresponding non-common sides of two side-by-side panels which are retained in side-by-side relation as part of one pair of side-by-side panel structures when the blank is in a flattened preform condition. The strut includes a first end portion having an integral hinge connection with one of the two panels along the corresponding side thereof, a substantial central portion free of connnection with the corresponding sides of the two panels, and a second end portion having an integral hinge connection with the other of the two panels along the corresponding side thereof. The strut is folded along the hinge connections so as to bring the first end portion into surface-to-surface engagement with the one of the two panels and the second end portion into surface-to-surface engagement with the other of the two panels. The two end portions are secured in such surface-to-surface engagement. The arrangement is such that when the blank is erected from its flattened preform condition into a rectangular tubular condition the strut is moved into an angular relationship within the carton space.

대표청구항 ▼

In an erectable carton comprising a flat blank of carton material cut and scored to form an array of side-by-side panels joined along common sides, each defined by four sides including one or two of said common sides, a strut cut from the carton material, and side flaps cut from the carton material

In an erectable carton comprising a flat blank of carton material cut and scored to form an array of side-by-side panels joined along common sides, each defined by four sides including one or two of said common sides, a strut cut from the carton material, and side flaps cut from the carton material extending from certain of the remaining sides of said panels other than said common sides, said blank being folded along said common sides and secured in lapped relation in a flattened preform condition so as to form a first pair of side-by-side panel structures disposed in abutting coextensive relation with a second pair of side-by-side panel structures, said blank being erectable from said flattened preform condition into a rectangular tubular condition wherein each pair of side-by-side panel structures are moved from said side-by-side relation into a perpendicular relationship with one another and said strut is moved within a side portion of the space defined by said pairs of perpendicularly related panel structures with said side flaps being foldable about their associated panel sides into side-closing relation with respect to said space, one of said panel structures being cut and scored to permit entry of an object therethrough into the remaining portion of said space and to retain the object in shadow box fashion against unwanted movement in a direction outwardly through said one panel structure while said strut prevents movement in a direction between the closed side flaps, the improvement which comprises said strut being cut from the carton material extending from a corresponding pair of said remaining non-common sides of two of said side-by-side panels which are retained in side-by-side relation as part of one pair of said side-by-side panel structures when said blank is in said flattened preform condition, said strut including a first end portion having an integral hinge connection with one of said two panels along said corresponding side thereof, a substantial central portion free of connection with said corresponding sides of said two panels and a second end portion having an integral hinge connection with the other of said two panels along said corresponding side thereof, said strut being foldes along said hinge connections so as to bring said first end portion into surface-to-surface engagement with the one of said two panels and said second end portion into surface-to-surface engagement with the other of said two panels, and means for securing said first and second strut end portions in said surface-to-surface engagement.