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Manufacture of internally reinforced boxes
| Details |
Inventors: Moen, Lenard E.;
Assignee:
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A mandrel has its face formed to define a negative impression of reinforcing elements to be formed into the walls of a Bliss box. The reinforcing elements may comprise tubular corner posts and/or intermediate hollow ribs or posts. The mandrel is mounted in a machine frame for reciprocation along its axis so that upon full extension of the mandrel it is disposed within a die cavity in which the Bliss body panel is formed around a pair of upstanding end panels. When fully retracted, the mandrel is positioned beneath and adjacent to a pair of magazines for holding supplies of flat end panel blanks, positioned on opposite sides of a superstructure frame of the mandrel. The superstructure is fitted with spaced pairs of feed pawls, a first set of which strips the flat end panels out of the supply magazines to deliver them to an arrested position, corresponding to the retracted position of the mandrel, as a result of extension of the mandrel. Concurrently, the flaps of each end panel are partially shoed inwardly. Upon subsequent full retraction of the mandrel, the partially folded flaps of the end panels are folded into and have portions formed by post defining impressions of the mandrel face. Upon a subsequent extension of the mandrel, a pair of thus fully formed end panels are fed into the die cavity along with a pre-glued body blank which is erected thereby. |
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DETAILED DESCRIPTION The invention provides a process and machine for forming Bliss boxes with internal reinforcing and compartmentalizing elements in the form of hollow corner and intermediate posts of triangular cross sectional configuration in conjunction with the end flaps and sidewalls of the body wrap.
An essentially polyhedral or prismatic mandrel is formed with a series of concave and convex flat faces to define a negative impression of a series of hollow triangular corner and/or intermediate posts desired in the final Bliss box.
The mandrel is mounted for reciprocation along its axis into and out of a die cavity.
A superstructure of the mandrel, on the opposite side thereof from the die cavity, is fitted on opposite sides thereof with spaced sets of pawls.
Upon a first extension of the mandrel into the die cavity, the outermost set of pawls strips a pair of end panels out of corresponding feed magazines or hoppers to deliver them into an arrested position between the die cavity and the supply magazines.
During the course of this movement each of the end flaps of an end panel is cammed inwardly approximately 60.
degree.
and a corner post element is formed.
While the partially formed end panels are held stationary, subsequent retraction of the mandrel brings it within the partially formed end panels.
Thereupon, rib folding mechanisms, one situated adjacent each corner of the mandrel, effect folding of areas of the flap into registration with indented or concave faces of the mandrel.
Upon subsequent extension of the mandrel initiating a second stroke thereof, the innermost set of pawls delivers the preformed or fully folded end panels into registration with the bottom panel area of the flat body blank.
Continued extension of the mandrel drives the fully folded end panels and body blank into the die cavity whereupon preglued areas of the body blank end flaps and side walls are fully formed into contact with the end panels.
Simultaneously, a second set of partially folded end panels has been brought into the previously stated arrested position by the outermost set of pawls
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Metal Working 
