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Патент USA US2119639

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June 7, 1938.
A. e. LOTTER
LOOSE LEAF BINDER
Filed Dec. 25, 1936
2,119,63§ _
0
2,119,639
Patented June 7, 1938
UNITED STATES PATENT OFFICE
2,119,639
LOOSE LEAF BINDER
to
Adolph'G. Lotter, Milwaukee, Wis., assignor
Stationers Loose Leaf Company, Milwaukee,
Wis., a, corporation of Wisconsin
Application December 23, 1936, Serial No. 117,368
4 Claims.
(01. 129-1)
This invention relates to loose leaf binders and
refers particularly to the so-called ring binders.
As is well-known, binders of this type comprise
_
a plurality of complementary impaling prongs
0 arranged for endwise engagement to form closed
loops to retain the sheets or leaves in the binder.
Inasmuch as these impaling prongs are mount
ed at their extreme inner ends upon relatively
movable members, di?iculty has always been ex
best mode so far devised for the practical appli
cation of the principles thereof, and in which:
Figure 1 is a perspective view illustrating part
of a ring binder and showing the application
of this invention thereto;
Figure 2 is an enlarged side View of the free
H O perienced in maintaining proper alignment be
tween their outer free ends.
.
In the event of misalignment between the
prongs the resulting offsets of their free ends tear
the sheets as they are slid across the rings and
15 in general result in a very unsatisfactory con
dition.
'
'
gagement; and
10'
Figure 3 is a top view of the free end portions
of the impaling prongs disposed in the positions
illustrated in Figure 2.
Referring now particularly to the accompany- V
ing drawing, in which like numerals indicate like
parts throughout the several views, the numeral 15'
5 designates the back of a conventional ring type
binder to which covers 6 are secured in the
To obviate this difficulty attempts have been
made in the past to provide an interlocking
customary
connection between the free ends of the prongs,
for
20 but the expedients heretofore employed either
did not secure the prongs against all relative
lateral motion, or they did not have a suf
?ciently wide mutual guiding action upon each
25
end portions of two complementary prongs,
spaced apart and in position for endwise en
other.
7
.
This latter objection was particularly notice
able in ring binders wherein the free end of one
impaling prong carried a projecting pin for entry
into an aperture in the free end of the other
30
impaling prong.
manner.
'
'
The back 5 encloses mechanism (not shown)
mounting
the
complementary
impaling 20
prongs ‘I and 8 at their inner ends.
This mounting mechanism, as is well known,
holds the complementary impaling prongs 'l and
8 with a spring tension either in the closed posi
tion illustrated in Figure 1 with their free ends 25
engaged, or in an open position with their free
ends spaced apart.
When the binder rings are closed, it is essential
that the connection between the prongs be free
from projections or oifsets and that one prong 30
With these and other objections to past and forms substantially an uninterrupted continua
existing ring binder constructions in mind, it tion of the other so as to permit free sliding of
is an object of the present invention to provide the leaves from one prong onto the other.
an improved interlocking connection for the im
To this end, a novel interlocking connection
9 is provided. This connection may be brie?y 35
paling prongs of a ring binder.
More speci?cally it is an object of this inven
35
described as two engaging bifurcations l0 and H
tion to provide a connection for the comple
formed respectively on the free ends of the impal
mentary impaling prongs of loose leaf ring bind
ing prongs 1 and B.
ers, which is so designed that it will securely
The two bifurcated ends of the prongs are sub
stantially identical and in each instance the bi 40
hold the prongs against all relative lateral mo
4-0 tion, and also mutually guide the prongs into furcation is formed by two V-shaped notches l2
proper relative positions from a comparatively out into opposite sides of the free end portion of
the impaling prong. On the prong 8 the notches
wide misalignment.
l2 are at opposite sides ofythe median plane of
With the above and other objects in view which
the ring and on the other prong they lie one 45
45 will appear as the description proceeds, this in
above the other on the median plane of the ring.
vention resides in the novel construction, com
bination and arrangement of parts substantially
as hereinafter described and more particularly
50
de?ned by the appended claims, it being under
stood that such changes in the precise embodi
ment of the hereindisclosed invention may be
made as come within the scope of the claims.
The accompanying drawing illustrates one
complete example of the physical embodiment
55 of the invention constructed according to the
In each instance the notches I2 are cut so that
their bottoms 53 form an acute angle with the axis
of the prong and meet at a point I4 coinciding
with the axis of the prong inwardly of the outer 50
end thereof.
As a consequence, the inner walls
of the bifurcations comprise four substantially
triangular plane faces [5.
Inasmuch as the bifurcations on the free ends
of the two impaling prongs are substantially 55
—
7 2._,
.
2,119,639.
identical, it follows that when the ‘ends of the
prongs are brought together, the plane faces 15
come into ?at surface-to-surface engagement,
and in the event of misalignment between the’
'free ends of the prongs, within normal limits,
the mutual guiding effect of the faces l5 guides
the ends of the prongs into proper alignment, the
spring tension urging .the prongs closed being
su?icient for this purpose.
10
From the foregoing description taken in con
nection with the accompanying drawing, it will
be readily apparent to those skilled in the perti
nent art, that this invention greatly improves the
ring type loose leaf binder by eliminating one of
15 its most common and universal objections.
What I claim as my invention is;
,
_
1. In a loose leaf binder: two impaling prongs;
means for mounting the impaling prongs at one
end in such a manner that their free, ends are
‘20, endwise
engageable to form a closed loop; an in
terlocking connection between the free ends of
the. impaling prongs comprising, a bifurcation
‘on the free’ end of each prong, said bifurcations
being arranged at right angles to each other so
thatpu’pon interengagementof the bifurcations
_fhe free ends of the impaling prongs are held
' against all relative motion except an endwise
movement apart.
2. In a loose leaf binder: two impaling prongs;
30.
means for mounting the impaling prongs at one
end in such a manner that their free ends are
endwise engageable to form a closed loop; an
interlocking connection between the free ends of
the impaling prongs comprising, complementary
.35
1
'_
>
_
angles to the notches of the ?rst designated im
paling prong so that the projections on one align
with the notches of the other impaling prong,
and the notches of one impaling prong being
substantially the same size as the projections on
the other so that the projections on one impaling
prong ?t snugly into the notches of the other.
3. In a loose leaf binder: two impaling prongs;
means for mounting the impaling prongs atone
end in such a manner that their ,‘free ends are 10
'endwiseengageable to form a closed loop; an in-‘
terlocking connection between the, free ends of ‘
the impaling prongs comprising, a pair of sub
stantially V-shaped notches at opposite sides of '
the free end portion of each impaling prong'with v~15‘
the bottom edges of the notches forming acute
angles with the axes of the impaling prongs and
meeting at saidaxes so‘that the free end of each
impaling prong is bifurcate with the inner walls
of its forks formed by angularly disposed sub 20
stantially plane surfaces, and the notches in one
impaling- prong being aligned with the forks on
the other impaling prong.
~
.
,
4. In a loose leaf binder: two impaling prongs;
'means for mounting. the impaling prongsat one 25
end in such a manner that'their free endsare
endwise engageable to "form a closed loop; an in
terlocking connection between the free ends of
the impalingv prongs comprising, a pair of sub
stantially V-shaped notches at opposite sides of
the free end portion of each impaling prong with
the bottom edges of thenotchesfforming acute
angles with the-axes of the impaling prongs and
meeting at said axesso'that the free end of- each
notches and projections on the free ends of the
prongs, the notches of ‘one impaling prong being >' impalingvprong is bifurcate withlthe inner walls‘
formed at opposite sides of the median plane of of the bifurcation formed by four substantially
o
. <
the loop and the notches of the other impaling triangular receding’ plane surfaces.
‘ prong being’ on the median plane and at right
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