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A sheet of material having a first set of concertina folds and, so as to be transverse to these when the sheet is folded with these folds, a second set of concertina folds, the sheet being provided with two diagonally opposite holding portions at segments thereof, which segments are at or near diago

A sheet of material having a first set of concertina folds and, so as to be transverse to these when the sheet is folded with these folds, a second set of concertina folds, the sheet being provided with two diagonally opposite holding portions at segments thereof, which segments are at or near diagonally opposite corners of the sheet and defined by folds and/or edges thereof, one of the holding portions being stiff and the opposite holding portion having a part extending beyond the remainder of the sheet when folded, so as to be suitable to be held in a binder; the part may be pre-bound in a book or may have punch-holes, suitable for a ring-binder; the material, part from the stiff portion, may be of paper-like plastics material that is tear-resistant.

대표청구항 ▼

A 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 and a folded condition, said second set of concertina folds being transverse to said first set of concertina folds when said sheet is folded, and t

A 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 and a folded condition, said second set of concertina folds being transverse to said first set of concertina folds when said sheet is folded, and the quantity of said first and said second set of concertina folds being different from each other; said sheet having two diagonally opposite segments and being provided with solely two diagonally opposite corner holding portions, one of said diagonally opposite corner holding portions being at one of said diagonally opposite segments and the other of said corner holding portions being at the other of said diagonally opposite segments, said segments being at diagonally opposite corners of said sheet and being defined by at least one of a fold and an edge thereof; one of said corner holding portions being stiff and intended for holding and said opposite corner holding portion including a beyond extending part extending beyond the remainder of said diagonally opposite segments of said sheet when folded and intended for holding and retaining; and holding means associated with said beyond extending part adapted for holding and retaining said sheet in a binder while leaving said one of said corner holding portions free for holding and opening with a single movement.