Modified lock arrangement for cartons

Abstract From the Canadian patent

This relates to a closure panel and lock arrangement for cartons of the wrap around type. The customary secondary lock includes at least one, and preferably two male locking tabs which have a locking projection on one side only of a narrow neck and defining a locking shoulder. The male locking tab is associated with a separate female locking slot in an inner closure panel immediately adjacent its folded connection with a side panel of the carton wherein the female locking slot is formed by a single knife arrangement forming first and second cut lines without the removal of material. The shapes of the cut lines provide for automatic opening of the female locking slot when the inner closure …