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Carton with automatic lock

  • US 4,516,718 A
  • Filed: 09/20/1983
  • Issued: 05/14/1985
  • Est. Priority Date: 09/20/1983
  • Status: Expired due to Term
First Claim
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1. A carton with an automatic locking closure means comprising:

  • (a) A tray member including side walls extending upwardly from a bottom panel about score lines;

    (b) a lid member including side walls extending downwardly from a top panel about score lines;

    (c) at least one male locking element connected to and extending upwardly from the upper edge of one of the side walls of the tray member in the same general plane of the side wall as an integral extension thereof, said locking element including a first shoulder portion which extends above the top edge of the side wall, a locking post integral with said shoulder portion which extends above the shoulder portion, and a tongue member integral with said locking post which extends above the locking post, said shoulder portion having a greater width than both said locking post and tongue member and said tongue member having a greater width than said locking post, said tongue member including a leading edge which tapers rearwardly to a pair of opposed shoulders which are formed from the material between said locking post and said first shoulder portion;

    (d) at least one cooperating female locking slot located generally along the score line connecting the lid top panel to an adjacent side wall, said slot being in the form of a continuous cut line comprising a central segment located in the top panel portion of the lid closely adjacent to said score line and at the ends of said central segment a pair of terminal segments located partly in the top panel and partly in the adjacent side wall to provide locking tabs which automatically engage the locking shoulders of said tongue element when the lid and tray are brought together to form the carton.

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