Method and apparatus for forming a flanged tray
US4295839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1979 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Jul 6, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D5/2047
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Method and apparatus for forming a stackable tray from a paperboard blank having a base panel, two pairs of wall panels attached to the base panel, adhesive coated gussets formed at the corners of the wall panels, and flanges formed along the outer edge of each wall panel. The tray forming apparatus includes a vertically reciprocating plunger having vacuum ports formed in its side walls, two pairs of flange folding fingers mounted on the plunger, a forming head including a cavity disposed beneath the plunger, and a stacking cage having flange retaining rails disposed beneath the cavity for receiving the trays after forming. The trays are formed as follows: A tray blank is first positioned over the forming cavity. The downwardly reciprocating plunger contacts the blank and urges it into the cavity causing the tray sidewalls to be erected and the adhesive coated gusset corners to be folded against adjacent side walls. The erected tray walls are retained on the plunger by the vacuum ports. The flange folding fingers are actuated by linear cams, with first one pair of flanges being folded and then the other with the flanges being folded outwardly and downwardly with respect to the tray…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.