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US 5,156,898 AGranted
Folded sheet
OwnerGeorge W. McDonaldinventor
Life of this patent
Estimating the term…
Abstract
A sheet of paper or like material having a first and a second set of concertina folds with the second set of folds being transverse to the first set when the sheet is folded. The sheet is provided with two stiff portions at diagonally opposite corner segments of the sheet, so that the sheet can be unfolded with a single movement and possibly using only one hand to grasp and unfold the sheet.
Claims16
A formed sheet of material comprising:
- a first set of concertina folds and a second set of concertina folds to permit folding of said sheet between an unfolded state and a folded state, said second set of concertina folds being folded in a direction transverse to said first set of concertina folds when said sheet is folded;
- said first and second sets of folds defining segments of said sheet;
- two diagonally opposite stiff portions at segments of said sheet disposed at or near diagonally opposite corners of said sheet and being located on opposed outer surfaces thereof when said sheet is folded;
- and
- said stiff portions being slightly larger than the respective corner segments of said sheet both when said sheet is in its unfolded state and in its folded state, and being positioned and configured to facilitate grasping of said stiff portions with opposite hands and allow said sheet to be unfolded in a single movement.
2 more elements
A rectangular formed sheet of material comprising:
- a first set of concertina folds and a second set of concertina folds to permit folding of said sheet between an unfolded state and a folded state;
- said first and said second sets of folds defining segments of said sheet and being mutually perpendicular and parallel to the respective edges of said sheet;
- said second set of folds being folded in a direction transverse to said first set of folds when said sheet is folded;
- and
- two diagonally opposite stiff portions at segments of said sheet disposed at or near diagonally opposite corners of said sheet and being located on opposed outer surfaces thereof when said sheet is folded;
- said sheet material apart from said stiff portions being paper or flexible material and said stiff portions being of semi-rigid material;
- said stiff portions being of equal size and having no fold lines, and being slightly larger than the respective corner segments of said sheet both when said sheet is in its unfolded state and in its folded state;
- said stiff portions being on the outside of said sheet when it is folded by said first set of folds and then also by said second set of folds;
- said stiff portions being separated by at least two folds in said first set of folds and at least two folds in said second set of folds;
- and
- said stiff portions being positioned and configured to facilitate grasping of said stiff portions with opposite hands and allow said sheet to be unfolded in a single movement.
8 more elements
Dependencies are inferred from the claim text.