US2229936A - Binder for leaves - Google Patents

Description

Jan. 28, 1941 BINDER FOR LEAVE S Filed May 17, 1939 F iG.1

A. PRACHE 2,229,936

Patented Jan. 28, 1941 UNITED STATES PATENT OFFICE 2,229,935 BINDER, FOR Leaves Andre Prache, Paris, France a Application May 17, 1939, Serial No. 274,095

8 Claims. (Cl. 281-25) This invention relates to devices for binding leaves or sheets and particularly to such devices comprising a comb-shaped structure the teeth of which are adapted to be inserted through aligned perforations formed along one of the marginal edges of a packor bundle of leaves.

The primary object of the invention is to provide an improved binder, wherein the teeth extending from the opposite edges of a strip of resilient material are so arranged that each perforation can be engaged by a pair of teeth juxtaposed side by side but in non-overlapping relation.

Another object of the invention is to provide an improved binder for leaves having marginal perforations, wherein the teeth juxtaposed side by side pairwise extend from staggered positions of the opposite edges of a strip-shaped stock of resilient material and are bent into loops that are engaged through the respective perforations.

Another object again of the invention is to provide an improved binder for perforated leaves or sheets, wherein the free ends of the teeth extend to the neighborhood of the edge of a strip 5 of resilient material opposite to its edge from which they spring out thereby forming complete loops separated by narrow slits.

Still another object of the invention is to provide an improved binder for a pack of perforated leaves, wherein each perforation is engaged by we pair of juxtaposed loops formed by bending round teeth extending side by side in reverse directions from the opposite edges of a strip-shaped stock of resilient material, the free ends of said loops being located at offset positions'so that the leaves cannot become unduly disengaged,

A further object of the invention is to provide an improved binder for perforated leaves, wherein the teeth or loops grouped pairwise extend from staggered positions of plain runs of the opposite longitudinal edges of a strip-shaped stock of resilient material, said plain runs being separated by notches into which may project the free ends of each tooth or loop, the slip between each pair of juxtaposed loops extending at any suitable angle to the major axis of the stock, the teeth being of tapered shape and separated in each pair by a helically extending slit, each notch being so sized and formed as to accommodate at least partly the adjacent end of a tooth or loop.

Still a further object of the invention is to provide an improved binder for perforated leaves which can be easily and cheaply made by punching a sheet of any suitable resilient material to form a comb-shaped blank of the required pattern, the teeth of such blank being afterwards readily bent into loops and engaged in pairs into the respective perforations of a pack of loose leaves or sheets for securely retaining said leaves 5 in bound relation, the tapering shape of the teeth facilitating their insertion through the perforations. I

With these and such other objects in view as will incidentally appear hereafter, the invention 10 comprises the novel structure and arrangement of parts that will be now fully described with reference to the accompanying drawing exemplifying suitable embodiments of the same and forming a part of the present disclosure. 15

In the drawing:

Figure 1 is a plan view of a blank from which the binder according to the invention may be bent and shaped into operative form.

Figures 2 and 3 are views similar to Fig. 1 20 showing modifications of the blank from which the binder is made.

Figure 4 is anelevational view partly isometric showing a binder according to the invention as applied to a pack of leaves or sheets formed 25 alongside one of their edges with a row of aligned marginal perforations of elongated shape.

Figure 5 is a fragmentary perspective view showing a modification of the binder as applied to a pack or bundle of leaves or sheets.

Like reference numerals designate like parts throughout the several views.

As illustrated in Figures 1, 2 and 3, the binder is made from a flat blank which may be constituted by any suitable thin material, preferably a 35 strip of a more or less hard and resilient material such as a metal or'alloy, Celluloid, viscose or the'like, such material being either left bare or covered or clad with paint, varnish, fabric or a similar coating. This coating may be of a 'color 40 matching that of the color of the leaves H) or contrasting with it. Any suitable ornamentation or inscriptions may be provided on the binder. The leaves It may be of uniform or differentiated thicknesses. For instance, the outer leaves of a 45 pack may be of greater thickness than the remaining leaves for affording the required protection of the pack.

As shown in Fig. 1, the strip from which the binder is made comprises a central or stock por- 50 tion II and a plurality of tapered teeth l2, 13 of equal length extending from the opposite longitudinal edges of said stock portion. Intermediate the teeth, each of saiddongitudinal edges is cut at intervals to provide inwardly tapering 55 from one edge to the other. The teeth I2, I3 are also arranged in staggered relation, those which extend from one longitudinal edge of the stock portion II substantially corresponding in location with the notches cut in the opposite longitudinal edge. In the form shown, one of the free edges of each tooth I2 or I3 is perpendicular to the longitudinal edge of the stock portion II while the other free edge of the tooth extends obliquely at an angle to said longitudinal edge, The angle at which run the oblique free edges of all teeth I2 on one side of the stock portion II is substantially equal to the angle at which the oblique free edges of all teeth I3 on the opposite side of said stock portion run, but said oblique free edges are slightly offset from any tooth I2 on one side to the nearest tooth I3 on the opposite side. The straight runs I6, I1 of the longitudinal edges of the stock portion II between the consecutive teeth I2 or I3 on each side are substantially longer than the widths of the teeth at their base (broader) end.

Owing to this arrangement, when the teeth have been bent round to form loops and the binder is in operative position with respect to the pack of leaves II) (as shown in Fig. 5) the teeth I2, I3 are grouped pairwise and a narrow slit I8 is defined between each pair of teeth juxtaposed side by side. Each pair of contiguous 'teeth or loops is engaged in one of a row of aligned marginal perforations I9 formed along the adjacent edges of the leaves Ill.

The modification shown in Fig. 2 slightly differs from the form shown in Fig. 1 by the fact I5 instead of being sharp have stump or truncated bottoms as shown as M and I5 and the straight runs I6, I! on the opposite longitudinal edges of the stockportion I I are almost equal to the width of the teeth I2, I3 at their base (broader) ends. As a result of this, the teeth are more closely clustered relative to one another. Consequently they can be engaged through closer I9 of the pack or leaves marginal perforations I0. As will be seen, in

v this construction, each tooth I2 forms with the not nearest tooth I3 on the opposite edge of the stock portion II a parallelogrammic structure.

In the modification illustrated in Fig. 3, the notches I4 and I5 have shapes similar to those shown in Fig. 1 but the free edges of the teeth I2, I3 instead of converging as in Figs. 1 and 2 run parallel to each other over the greater portion of their lengths and are interconnected adjacent their extremities by short oblique lines I 2a and I3a forming, as it were, bevels. The obliquity of each line I2a runs, r lative to the major axis of the stock portion II reverse to the obliquity of each line I3a, the latter being substantially parallel with the obliquely extending edge 01 the notches I4 and I5. The teeth I2 and I3 extend from the opposite edges of the stock portion II in staggered arrangement, and the straight runs I6 and I! are about twice as long as the width of each of the teeth.

Instead of having bevelled ends as shown at I3 may have double bevels as illustrated in Fig.

As will be seen, the free end of each tooth I 2 or I3 projects into one oi the notches I5 or I formed in the longitudinal edge of the stock portion II of the strip opposite to the edge from which the teeth extend. Thisfeature. coupled with the fact that a pair oicompanionteeth I2, I3 defining between them a narrow slit I8 -is.-en-

13 they :1 a direction 1 perforations comprising gaged through each perforation I9, prevents the leaves In from becoming unduly disengaged from the binder. If any leaf I 0 is swung about the axis of the binder, for example when opening out a pad or copybook or catalogue made of a number of such leaves thus bound, the portions of the leaves situated between their marginal perforations I 9 cannot be moved beyond the plain portions or runs I6. I! of the longitudinal edges of the strip II and cannot therefore penetrate into the notches I4, I5 and slide back through the slits I8. In other words, the leaves are locked in packed or bundled condition by the insertion of pairs of oppositely extending teeth or loops I2, I3 through their perforations I9.

An advantage of the notches I4, I5 which receive the free extremities of the teeth I2, I3 that are bent into loops to fulfil their leaf-binding function is that they enable said extremities to extend well beyond the adjacent edges of the packed leaves, thus rendering the binding more secure. Another advantage of the notches I4, I5'is that by receiving and snugly accommodating the free extremities of the teeth or loops I2, prevent them from becoming turned or shrivelled up particularly when a pack of leaves thus bound rubs a neighboring object. This obviates the risk of the extremities of the teeth I2, I3 becoming a cause of wound or injury.

Where, as in the embodiment shown in Fig. 5, the narrow slits I8 between the contiguous teeth or loops I 2, I3 in each pair extend helically to the major axis of the strip II, the risk of an undue disengagement of the leaves III is still further lessened while the other qualities of the binder are further enhanced.

The improved binder is applicable to packs or bundles of leaves or sheets made of paper, cardboard, thin metal or alloy, viscose and like products, Celluloid and analogous sheet form materials and particularly to all articles used in stationery or for teaching or advertising purposes such as copybooks, books, albums, diaries, catalogues, loose leaf pads; it is also adaptable to packed or bundled maps, charts, cards or similar articles.

The constructional details might vary of course without departing from the scope of the subjoined claims.

What is claimed is:

1.-A binder for leaves provided with sets of aligned marginal perforations comprising a strip of resilient material having teeth extending from its opposite edges, said teeth being so positioned and curled in "opposite directions as to form pairs of oppositely convoluted resilient contiguous loops, 9. pair of said contiguous loops being sprung into each set of perforations, the free end of each tooth being adjacent the edge of the strip opposite to the edge whence said tooth extends.

2 A binder for leaves provided with marginal perforations comprising a strip of resilient material having spaced notches in its opposite longitudinal edges and teeth extending from the plain portions of said edges, said teeth being so positioned and curled in opposite directions as to form pairs of oppositely convoluted resilient contiguous loops free of overlap, the pairs of said contiguous loops being sprung into the respective perforations, the free end of each loop projecting into a notch in that edge of the strip opposite to the edge whence said loop extends.

3. A binder for leaves a strip of resilient mateprovided with marginal rial having staggered notches in its opposite longitudinal edges and teeth extending from the plain portions of said edges between the notches, said teeth being so positioned and curled in opposite directions as to form pairs of oppositely convoluted resilient contiguous loops free of overlap, the pairs of said loops being sprung through the respective perforations, each loop being taperedand projecting into a notch of matching tapering shape in that edgeof the strip opposite to the edge whence said loop extends.

4. A binder for leaves provided with marginal perforations comprising a strip of resilient material having staggered notches in its opposite longitudinal edges and teeth extending from straight portions of said edges between said notches, each tooth being narrower than the straight portion of the strip edge whence it extends, said teeth being curled in opposite directions to form pairs of oppositely convoluted resilient contiguous and nonoverlapping loops engaged through the respective perforations, each loop having a tapered outline and projecting with its free end into a notch in that edge of the strip opposite to the edge from which said loop extends.

5. A binder for leaves provided with marginal perforations comprising a strip of resilient mateloops being engaged through the respective per-' forations, each tooth being tapered and projecting into a notch in'that edge of the strip opposite to the edge from which said tooth extends.

6. A binder for leaves provided with marginal perforations comprising a strip of resilient material having staggered acute notches in its opposite longitudinal edges and integral taperin teeth extending from straight runs of said edges between said notches, one edge-10f each tooth be- 7 ing aligned with one side of a! notch while the opposite edge of said tooth meets at an angle the adjacent straight run of the strip edge, said teeth being curled in opposite directions to form pairs of oppositely convoluted resilient. adjacent loops, the contiguous edges of the loops in each pair running helically to the major axis of the strip, the pairs of adjacent loops being engaged through the respective perforations, the free end of each tooth deeply projecting into a notch in that edge of the strip opposite to the edgefrom which said tooth extends.-

7. In combination with a packol leaves provided with aligned marginal perforations, a

binder comprising a strip. of resilient material having teeth extending from itsopposite longitudinal edges and so positioned: and curled in opposite directions as to form pairs of oppositely convoluted resilient contiguous loops inserted through the respective perforations, the free end of each tooth being adjacent the edge of the strip opposite to the edge from which said tooth ex- I tends. i

8. In combination with a pack of leaves provided with aligned marginal perforations, a binder into a notch in the edge of thestrip opposite to the edge from which said tooth extends.

' AIlDRE f PRACHE.

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