Patent ID: 7815559

Claim:
An apparatus for forming a stackable container from a container blank, said apparatus comprising: a blank feeder configured to place said blank on a conveyor; plow structures configured to fold two opposing sidewalls of said container blank at an angle of approximately 90 degrees with respect to a base of said container blank; an index folder comprising two parallel holding members and two folding members parallel to said holding members, said index folder configured to pre-fold a plurality of fold-down flaps and an index flap over each opposing sidewall flap of said two opposing sidewalls, each of said holding members contacting an inner surface of one of said opposing sidewall flaps below a first fold line between said index flap and said sidewall flap and approximately at a second fold line between said sidewall flap and at least one of said fold-down flaps, and each of said folding members configured to push against an outer surface of said plurality of fold-down flaps and said index flap above said first and second fold lines, wherein said index flap is configured to form an index tab protruding above said second fold line when folded at an angle of 180° with respect to said sidewall flap; and a pressure former configured to attach a first leading extension to a leading wall of said blank and a first trailing extension to a trailing wall of said blank, wherein said first leading extension and said first trailing extension are foldably attached at an angle of about 90 degrees to one of said fold-down flaps or one of said sidewall flaps.