Carton and blank with locking top

• US 5,522,538 A
• Filed: 01/09/1995
• Issued: 06/04/1996
• Est. Priority Date: 01/09/1995
• Status: Expired due to Fees

• Current Assignee: Meadwestvaco (WestRock Company)
• Original Assignee: Westvaco Corporation (Meadwestvaco Corporation)
• Inventors: Gray, Larry D.
• Primary Examiner(s): Shoap, Allan N.
• Assistant Examiner(s): MCDONALD, CHRISTOPHER
• Application Number:
  US08/370,092
• Time in Patent Office: 512 Days
• Field of Search: 229/112, 229/120.18, 229/120.21, 229/125.28, 229/149, 229/165, 229/169, 229/186
• US Class Current: 229/112
• CPC Class Codes: B65D 5/2047 trapezoidal, e.g. to form a body with diverging side walls B65D5/2033 takes precedence
• CPC Class Codes: B65D 5/2057 Inter-engaging self-locking flaps B65D5/4254 takes precedence
• CPC Class Codes: B65D 5/241 and the gussets folds connected to the inside of the container body B65D5/247 and B65D5/248 take precedence

Abstract

A carton for a food product or the like is prepared from a pre-cut and scored single blank of paperboard with a provision for a locking top closure and self-erecting rhombic shaped end panels. The rhombic shaped end panels include integral connector panels and paired intermediate end panels, at least one pair of which are adhered to a side wall of the carton to assist in the self-erection of the carton as it is folded from a flat pre-formed condition to an upright fully formed condition.

Claims

1. An erectable container capable of being retained in a partially erected condition having a trapezoidal cross-section formed from a single blank of foldable material comprising:

(a) front, bottom and rear panels connected to one another along parallel fold lines;

(b) a pair of opposed rhombic shaped end panels foldably attached to said bottom panel;

(c) opposed pairs of abbreviated end flaps foldably attached to each of said front and rear panels wherein at least one pair of said opposed abbreviated end flaps is adhered to one of said front or rear panels;

(d) connector panels integral with and foldably attached between the .end panels and abbreviated end flaps;

(e) overlapping interior and exterior closure flaps foldably connected respectively to one each of said front and rear panels;

(f) a locking means between said exterior closure flap and one of said front or rear panels comprising a locking tab foldably attached to the exterior closure flap consisting of a first locking element and a reverse second locking element cut from a portion of said locking tab, and locking slots formed in one of said front or rear panels consisting of a first locking slot and a second reverse locking slot each formed in said front or rear panel to provide a positive double articulated lock for the container in reverse orientation; and

,

(g) a pair of inset notches formed at each corner of the interior closure flap along the fold line between said interior closure flap and one of said front or rear panels which permits the interior closure flap to be folded downwardly between said rhombic shaped end panels during the erection of the container to keep the container partially erected for filling and serving.