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US 4,391,366 AGranted
Foldable cup
AssigneeTokai Metals Co., Ltd.
InventorIsao Hirata
Life of this patent
Estimating the term…
Abstract
A foldable cup comprising a collapsed flat tubular outer shell made of a hard material and having open opposite ends and a collapsed flat pouch made of a flexible material and fixedly inserted within the outer shell. This flat foldable cup can be expanded, when the outer shell is opened, without developing crumpled portions in the bottom walls of the pouch and the outer shell.
Claims7
A foldable cup comprising:
- a substantially tubular outer shell made of a stiff material and having longitudinally spaced opposite ends and two overlapping lateral edges extending between said ends, said shell being foldable along longitudinal fold lines parallel to said lateral edges to collapse said shell to a substantially flat condition, said cup including a pouch made of a flexible material disposed within said outer shell for accommodating contents, said pouch comprising a pair of opposing body walls bonded to the inside of said outer shell and having bottom wall portions foldable to lie between said body walls when said pouch is collapsed to a flat condition, said bottom wall portions having bottom edges flexibly connected to bottom edges of said body walls, respectively, and each bottom wall portion having a common edge flexibly joining said bottom wall portions together, said body walls and said bottom wall portions each being connected along lines extending obliquely from upper portion thereof with respect to said longitudinal fold lines toward the bottom edges of said respective body walls, said pouch including longitudinal lateral edges along which said body walls are flexibly connected, said lateral edges of said pouch extending from the upper edges of said body walls to a point intersecting the obliquely extending lines, the distance between said lateral edges of said pouch being substantially equal to the distance between said lateral edges of said outer shell, the distance between the upper and bottom edges of said pouch when folded being substantially equal to the distance between the upper and bottom edges of said outer shell, the distance between said common and bottom edges of said bottom wall portions of said pouch and the length of said obliquely extending lines being such that when said outer shell and pouch are unfolded, said bottom wall portions lie within the bottom edge of said outer shell, said lateral edges of said body walls of said pouch having opposing inner surfaces which are bonded together and folded exteriorly over onto one of said body walls of said pouch, the resulting folded portion of said lateral edges of said pouch being bonded to the adjacent body wall in the vicinity of said upper edge of said body wall of said pouch.
Dependencies are inferred from the claim text.