An embodiment of the invention is illustrated schematically with reference to the drawings, in which:
FIG. 1 is a plan view of a quadrilateral sheet of the book or album according to the invention;
FIG. 2 is a perspective view, obliquely from above, of portions, close to the spine, of the front and back cover connected to accordion-like spine strips; and
FIG. 3 is a perspective view of the central part of the sheet, shown in enlarged scale, according to FIG. 1 with two spine folds protruding through its two slots and a connecting element in a position for partial insertion into the slot in the spine fold.
In FIG. 1, denoted by reference numeral 1 is a quadrilateral sheet of the book or album according to the invention having at its centre a groove or a fold 2 running through two central slots 3 and 4 which have a specific width and length and are both of identical configuration. The sheet 1, made for example of a thin rigid cardboard, is foldable along its groove or fold 2 and forms four sides of a book or album according to the invention.
FIG. 2 shows a part, close to the spine, of a front and a rear cover 5 and 6 of sufficient strength. The two covers 5 and 6 are rigidly connected to each other at a predetermined spacing by two spine strips 7 and 8 arranged in parallel. Between the inner, mutually opposing edges 9 and 10, the spine strips are folded in the manner of an accordion in a zigzag shape. In other words, the spine strips 7 and 8 are each folded in the manner of a concertina between the inner cover edges 9 and 10 into peak folds of equal height, of which one of the two spine strips is denoted by reference numeral 11, of which two respective peak folds of the spine strips 7 and 8 are aligned with each other in the longitudinal direction.
The number of peak folds and the length and height thereof are selected in such a way that two respective aligned peak folds can be fed through the two slots 3 and 4 in a sheet.
FIG. 3 is an enlarged view of the central part of the sheet 1 with two peak folds 11, 11′ protruding through the slots 3 and 4 and a narrow, web-like connecting element 12 in its position of partial insertion in which it has been fed through the narrow opening in the sheet fold 11′ above the sheet 1.
To fasten the centrally slotted sheet 1 to the two spine strips 7 and 8, the connecting element 12 is also pushed through the narrow opening in the second peak fold 11. The narrow, web-like connecting element 12 made of rigid cardboard, plastic material or metal is in this case of a length such that, in the position of full insertion, its leading and trailing ends are located in the region of the parallel lateral edges of the covers. The edges can be rounded at least at one end to facilitate insertion of the web-like connecting elements.
In the exemplary case, the book or album according to the invention has eight quadrilateral sheets 1 which are each detachably held, using a web-like connecting element 12, on two aligned peak folds of the spine strips 7 and 8, for which purpose two pairs of peak folds each protrude through the slots 3 and 4 in the sheets in such a way that a web-like connecting element 12 is insertable through the openings, projecting beyond the sheets, in the peak folds.
In the exemplary case in FIG. 2, the spine strips are integral with the two covers.
However, in FIG. 2, the partial portions 5 and 6 can also be type areas which are each fastened to the insides of the two covers.
At their ends, the spine strips 7 and 8 can each have flattered portions which are rigidly connected, for example bonded, to the type areas or the covers.
The embodiment, shown in the drawings merely by way of example, of individual parts of an assemblable book or album according to the invention will directly encourage a person skilled in the art to think of modified books or albums which do not depart from the basic idea of the invention.