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Патент USA US3099473

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July 30, 196,3
Filed April 1, 1959
United States Patent C
Patented July 30, 1963
The following embodiments show the object of the in
FIG. 1 «is a perspective view,
FIG. 2 is a front elevation, enlarged,
Walter Lennartz, Krautergarten, Dachau-ost, Germany
Filed Apr. 1, 1959, Ser. No. 803,520
Claims priority, application Germany Apr. 3, 1958
3 Claims. (Cl. 281--19)
the front cover 2 which are of hard foil and of conven
Assembly folders of synthetic material for storing cases
made of synthetic material Íor for showing of so-called
tional synthetic material.
The inside narrow and elongated strip 3 is arranged
prospectus cases made of transparent soft foil are known;
these folders have many different kinds of devices for
filing, which devices are made entirely of metal in the
on the folder back and is made yadvantageously of one
piece with the rear folder cover 1, which, according to the
invention, is shaped to form the guide for the track 4,
form of screw springs, wire bows, etc. and which need
which serves to carry the stack of Ithe filed cases.
fittings, again of metal and composed of several parts, for
the connection to the fold-er.
Many and real disadvantages arise for the assembly
folders through these metal holding devices.
First of all such filing devices demand a comparatively
FIG. 3 is a view lfrom above, and
FIG. 4 shows a detail.
The assembly folder consists of the rear cover 1 and
This guide is, compare FIG. 2, formed by an inwardly
bent fold or lip 6 on the free edge of the inside strip 3
and by the turning fold 7 of the strip 3, so that a
U-shaped setting is formed which holds the track 4
securely and in spite of this makes it possible to insert
great amount of space, in height and in width, so that
such folders have to have a wide, unhandy back which 20 or remove the track easily.
It is possible to provide a second fold independent of
for the most part is not fuliy utilized and which absolutely
this on the inside of the fold 7, which can be made in
is not necessary. The closed and only partly ñlled folder
one piece with the inside >strip 3; also the fold or lip 6
then forms a long wedge which makes it impossible to
(or in some cases both folds) can run somewhat bent
stack many folders. In addition, the folder takes up
against the strip 3 whereby the fold receives a certain
correspondingly more space on a shelf, etc.
the single assembly folders are already somewhat bulky
due to the broader back necessary for the fittings, etc. so
that there is not, or not sufficient, room »left in a dispatch
case for other articles or these must be pressed together
in a disadvantageous manner. Furthermore these metal
holding devices increase the weight of the folder and it
is not only -the metal itself -but also the thick-walled, stili
folder cover, necessary for fastening the fittings, which
amount of spring which increases the clasping ability
without any disadvantageous inñuences lon the change~
The track 4 is provided with :a holding device for the
cases 5 to be filed, which holding device can in general
be shaped in different ways. In most cases the usual
flexible filing tongues S are sufficient; they are shown as
dotted lines in FIG. 3. These 'tongues have the advantage
that they lie flat on the track 4 again so that the filed
contribute to the weight. If the folder consists of thin
35 cases 5 and the bent over tongues can be inserted into
Walls and flexible parts as for example in `a paper folder,
or removed from the U-shaped inside strip S without any
then only filing tongues can be used, not devices of the
diñiculty. The filed case stack 5 on the «track 4 makes it
mentioned type.
to introduce and to remove the track 4 into, re
Furthermore assembly folders of the letter file type are
known which have a tiling device placed ion a track on the 40 spectively, out of, the U-shaped inside strip 3, in that the
stack 5 for example is held directly next to the track with
inside of the folder back and which track can be inserted
and removed.
The invention relates to lan assembly folder of synthetic
material especially for cases made of synthetic material
which produces a new type of assembly folder, an inter
mediate type between the stiff folder and the paper folder
and which avoids the drawbacks of these two types.
The invention consists therein that an inside strip
arranged on the folder back has a bent-in fold on its free
‘the thumb and ñrst finger 'and then, while introducing
the track is either pulled upward, or, when being re
moved, pulled downward, so that only one movement is
necessary to lay the track 4 free so that the cases can be
In order to insert the track 4 into the U~shaped inside
strip 3 it is appropriate to cover the holding device, i.e.
the ñling tongues or prongs 8, or some other equipment
arranged for this purpose, with an yauxiliary strip 9, see
edge which, together with the turning fold of the inside 50 FIG.
4. This auxiliary strip can also be made of synthetic
strip, compose the guide for the track.
upper half is connected, either glued or
This design has a number of advantages.
welded, with the track 4 and whose lower half loosely
First of all, the assembly folder remains ñat because
covers the filing tongues 8 so that these can be laid free
there are no tiling members and thus the wide back also
they are to be used.
must be used since the flat inside strip is used as a guide 55
The attention is also drawn to the tfact that there is
and the stack of cases iiled on «the track lies between said
taken a special measure which serves to increase the hold
track and the rear folder cover. The reduced weight
ing capacity considerably. It is advantageous iwhen the
of the assembly folder is also important; this is accom
cases `5 are executed with a simple foil appendage .10
arranged on the filing end and which is equipped with
as well as by not using any metal parts. The dependable
perforations. The appendage consists thus of a simple
and permanent embedding of the case stack -by means of
thin foil so that even when 30 or more cases are stacked
rthe track is especially to be noted; this is enclosed by the
there is still a comparatively thin package which can be
inside strip so that a loosening of this binding or an inde
easily put between the inner strip 3 and the rear cover
pendent loosening or falling out of the track with its
1 Without too much expansion of the folder taking place.
ñled stack of cases is impossible, whereby it makes no 65
The rear cover 1 is connected advantageously with the
difference whether the assembly folder is kept in a stand
front cover 2 by a back strip 11 composed of soft foil.
ing or hanging position. Finally the simple method of
lt must be said, however, that the execution of the as
use is important: the track, iilled with the stack of cases
sembly folder as such can be formed as wished, ie. so
is inserted into the inside strip from one end of the same,
that the rear cover 1 with the front cover 2, together either from the bottom for from the top, or conversely, 70
with the back strip 11 and the inside strip 3 all consist
removed, in order to be able to exchange the cases on the
of one piece of foil, whereby the inside strip 3` for ex
track in the usual manner.
plished through the light weight execution of the folder
ample is `formed by a rfold. In the salme manner the foil
for the rear as yWell as for the ‘front cover can be chosen
as to the type of synthetic material, as to strength or as
to transparency or opaqneness.
I claim:
1. An assembly `»folder for storting thin transparent soft
foil cases, letterhead sheets and the like comprising a
cover of relatively stiff ilat sheet material, said cover
having a narrow elongated strip integral-ly »formed there
with, folded inwardly from the inner edge of the cover
sheet to overlie the same, and extending substantially the
full length thereof providing an integral relatively rigid
opposite face of said track to lie flush against the cases,
letterheads and the lilse to releasably retain them upon
the track, a soft ilexible yfoil _member surrounding both
faces of said ñat elongated track and secured to the one
face thereof to retain the bendable prong holding device
against outward displacement 'from the one face thereof,
said soft flexible foil being folded over one edge of the
track and extending inwardly to loosely cover the soft
ifoil cases, letterheads and the releasably longitudinally
extended prongs whereby to facilitate the longitudinal
sliding of the track within the rigid guide without inter
ference of the prong holding Idevice upon the track with
the cases, letterheads and the like being assembled npon
relationship with the inner [face of the cover she-et, an
or disassembled from the rigid guide and cover sheet.
inwardly folded guide and retaining lip integrally formed 15 3. An assembly folder for storing thin transparent soft
on the elongated strip to oppose the integral fold of the
:foil cases, letterhead sheets as defined in claim 1, Iand
elongated strip upon the cover sheet, said `guide lip ex
a second cover of similar relatively stiff .ilat sheet material
guide, said elongated strip lying in ñxed parallel plane
tending parallel to and slightly spaced from the under
disposed along the inner side edge of the first mentioned
face of the elongated strip, an elongated track of rela
cover, and a ilexible foil hinge strip secured ñush upon
tively stiñ Iflat sheet material slidably mounted in the 20 the outer ¿face of the narrow elongated strip of the first
rigid guide land runder the `guide lip of the elongated strip
between the opposing lip and the fold of the narrow elon
gated strip npon the cover and retained against longitu
dinal displacement within the rigid guide by the clasping
`action of the lip, and a holding device carried by said 25
track for releasably securing the thin cases, letterhead
sheets and the like to the track.
2. An assembly cover for storing thin transparent soft
rfoil cases, letterhead sheets and the like as Ideñned in
mentioned cover and secured flush upon the faces of the
second cover Ialong the inner e'dge thereof.
References Cited in the ñle of this patent
Weber _______________ __ Iuly l1, 18812
Dawson _____________ __ Mar. 21, 1922
Kearney _____________ __ Oct. 13, »1942
Germany _____________ __ Aug. 3, 1929
France ______________ __ May 30, 1944
Switzerland ___________ __ Jan. 17, 1949
claim 1, and said holding device running along one »face 30
of the track `and having bendable and releasable prongs
extending through the track and adapted to extend
through the thin soft foil cases, letterhead sheets and the
like and bent over and longitudinally extended along the
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