Container trim configuration
To guard against injury to persons engaging the trim edges of a hinged container, a protective flap extends from the lid on either end of the axial hinge. The flaps extend from the corners of the lid adjacent respective trim edges of the hinge. The flaps have a rounded bottom portion which is extended past the axial hinge line. The curved structure of the protective flaps helps to gently deflect objects, such as fingers, away from any sharply angled trim edges of the hinge, thereby guarding handlers from accidental injury.
1. A plastic thermoformed hinged container comprising:
a thermoformed plastic sheet having a trim edge and comprising a lid and a base formed from a thermoformable plastic material;
the thermoformed sheet including a hinge connection comprising a foldable axial hinge line between adjoining edges of the lid and base for pivoting of the lid with respect to the base along the hinge line thus allowing the lid and base to be repeatedly moved between open and closed positions;
the lid and base each having a generally rectangular perimeter with rounded base corners and having peripheral lid and base flanges that mate in planar engagement in the closed position forming a generally rectangular perimeter of the closed container with the hinge line forming one edge of the rectangular container perimeter;
the hinge connection further comprising:
abutting planar wall portions of the peripheral lid and base flanges adjacent either side of the hinge line lying in a common hinge reference plane (HRP) when the lid and base are in the open position, the HRP being parallel to a base reference plane (BRP) in which the base rests,
the abutting planar wall portions being disposed one atop the other in mating planar engagement while the hinge line is folded to form the one edge of the rectangular container perimeter when the lid and base are in the closed position;
wherein, the hinge line and abutting planar wall portions in the closed position comprise:
first and second sharp trim edges disposed at opposing ends of the hinge line and recessed inwardly from the rectangular container perimeter in the closed position; and
first and second protective flaps extending from the rectangular lid perimeter and spaced respectively from the first and second sharp trim edges by first and second rounded trim edge inlets in the lid perimeter, wherein the protective flaps extend beyond the hinge line and form hinge guards restricting access to the first and second sharp trim edges at opposing ends of the hinge line in the closed position.
2. The plastic thermoformed hinged container of claim 1 , wherein:
the thermoformed plastic sheet comprises a non-foamed solid sheet of plastic material having a thickness of at least 0.01 inches.
3. The plastic thermoformed hinged container of claim 2 , wherein:
the thickness of the thermoformed plastic sheet is in a range of from 0.01 inches to 0.05 inches.
4. The plastic thermoformed hinged container of claim 2 , wherein:
the plastic material comprises one or more of polyester, polyolefin, and polylactic acid, including homopolymers, copolymers, and blends thereof, and including virgin and reclaimed materials.
5. The plastic thermoformed hinged container of claim 3 , wherein:
the container is an egg carton comprising a non-foamed solid sheet of polyester material of a thickness in a range from 0.01 to 0.05 inches.
6. The plastic thermoformed hinged container of claim 1 , wherein:
the plastic material is a foamed material.
7. The plastic thermoformed hinged container of claim 1 , wherein:
the plastic material is a non-foamed material.
8. The plastic thermoformed hinged container of claim 1 , wherein:
the container comprises an egg carton.
9. The plastic thermoformed hinged container of claim 8 , wherein:
the egg carton is a bi-fold egg carton.
10. The plastic thermoformed hinged container of claim 9 , wherein:
the thermoformed plastic sheet further comprises a cover, the cover being hingedly connected to another edge of the base lying parallel to and opposing the hinge line, for pivoting of the cover and base between open and closed positions, wherein in the closed position of the container, the cover is closed over the base, and the lid is closed over the closed cover and base.
11. A method of forming a hinged container of claim 1 , including steps of:
thermoforming a sheet of thermoformable plastic material to from the lid and base;
trimming a peripheral edge of the thermoformed sheet to form the trim edges of the lid, the base, the abutting wall portions of the lid and base, the flaps and the inlets.