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Патент USA US2134122

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Oct. 25, 1938. ‘
w,E..HAsK|N
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.
2,134,122
LoosE LEAF SHIFT BINDER
FiledFeb. 28, 195e
5 sneèts-sneet 1
ATTO???
Oct. 25, 1938.
W_ E_ HASKlN
2,134,122
LOOSE LEAF SHIFT BINDER
Filed Feb
. _28, 1955
5 Sheets-sheet 2
WITNESSES
INVENTOR
BY
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m wwwa
ATTORNEYS
Oct. 25, 1938.
w. E. HAs'KlN _
¿2,134,122
LOOSE LEAF SHIFT BINDER
Filed Feb._ 2s, 195s
5 Sheets-Sheet 3
7,
4.9"
INVENTOR
WZf/Íe/ E @fÃ1/1
BY
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ATTORNEYS
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OCÍ- 25, i938-
w. E. HAsKlN
2,134,122
LoosE LEAF SHIFT BINDER
Filed Feb. 28, 1956
5 Sheets-Sheet 4
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Oct. 25, 1938.
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W_ E HASK|N
2,134,122
LoosE LEAF SHIFT BINDER
Filed Feb. 28, 1936
5 Smets-sheet 5
33
WITNESSES
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2,134,122
Patented Oct. 25, 1938
UNITED STATES
eArENT orifice .
2,134,122
LOOSE LEAF SHIFT BINDER
Walter Easter Haskin, New York, N. Y., assigner
to Pressed ¿t Welded Steel Products Company,
Inc., Long Island City, N. Y., a corporation of
New York
Application February 28, 1936, Serial No. 66,170
22 Claims.
This invention relates to a loose leaf binder
to Figure 4, but showing the respective sets of
and particularly’ to an improved loose leaf shift
binder adapted to be made in various sizes and
constructed to receive perforated leaves of the
5, full size of the binder or leaves of less size than
prongs in a partially open position.
~
. Figure Gis a bottom plan view of the binder
the binder, or a combination of different sized»
leaves.
An object of the invention is to provide an im
proved loose leaf shift binder wherein one or
more leaves may be shifted longitudinally of the
binder the distance of one hole or the distance
of a plurality of holes without removal from the
binder.
'
A further object of the invention is to provide
15 a loose leaf shift binder wherein the leaves, with
out removal, may be shifted back and forth a
distance equal to the distance between one or
more holes in the leaves, obviating the neces
sity of breaking the back of thel binder at the
20 longitudinal center line or otherwise so that the
back always lies fiat throughout the operation.
An additional object, moreV specifically, is to
provide a loose leaf shift binder of the fully
overlapping arcuate prong type, the structure
25 being so formed that the prongs may be readily
separated laterally and longitudinally by irn
proved mechanical means wherein the element
of constant control of the movement of the
prongs and the accurate spacing thereof for
30 purposes of shifting or changing the leaves with
out spilling or tearing of same is of paramount
importance.
'
In the accompanying drawings:
Figure 1 is a top plan view of a loose leaf shift
3 Ul binder disclosing an embodiment of the inven
tion, part of the side covers and the inserted
leaves being broken away and showing the re
spective sets 'of prongs in their fully-closed rela
tion.
Figure 2 is a view similar to Figure 1, b-ut show
40
ing the prongs in a partly open position and
showing the operating lever and respective sets
of prongs shifted one notch, or the distance be
tween centers of two consecutive holes in the
.45 margin of the leaves, with dotted lines indicat
ing the operating lever and respective sets of
prongs shifted two notches, or the equivalent of
twice the distance between centers of two conse
cutive holes in the margin of the leaves.
50
Figure 3 is a longitudinal sectional view
through Figure 1 approximately on the line 3--3.
Figure 4 is a transverse sectional view through
Figure 3 approximately on the line 4----4.
Figure 5 is a view in transverse section similar
55
with the `back removed and the parts shown in
the same position as illustrated in Figure 1.
Figure -7 is a view similar to Figure> 6 showing
the parts inthe same position as illustrated in
Figure 2.
«
Figure 8 is a viewin »transverse section on the
line 8-«8 of Figure 3, but showing the respective
sets of prongs in their fully open position.
Figure 9 is a perspective View of a left hand earn
plate with a series of prongs mounted thereon
and the side cover hingedly attache-d thereto
partly broken away.
~
~
.
115A
Figure 10 is a perspective view of one end of
the skeleton framework embodying certain fea
tures of the invention.
Figure 1l is a fragmentary elevation of the in
terlocking hinge by which the side covers are 20
attached to the cam plates.
Figure 12 is a perspective view of one end of
the skeleton framework embodying certain modi
iications of the invention and showing the lock
25
ing bar in its fully closed and locked position.
Figure 13 is a horizontal sectional view through
Figure 12'on the vline l3--l3.
~
Figure Alll is a view similar to Figure 13 but
showing the operating >lever and locking bar in
ashift position.
Y
'
Figure l5 vis a perspective view of the locking
bar.
»
~
.
Referring to the accompanying drawings by
numerals, l indicates a rigid back of any de
sired kind, as for instance a metal channel
shaped member either covered with leather or
other suitable material or left bare. This back
is provided with stiffening flanges 2.
Mounted inside the channel-shaped base I
and securely attached thereto is a skeleton 40
framework comprising the following partst-At
each end thereof are positioned substantially U
shaped pedestals 3 and 3’ provided with two up
ward projecting legs, the outer leg being longerthan the inner one. Both pedestals are formed 45,
With outwardly projecting flanges 4 which may
be attached to the sides. of the back member I
by rivets 5.
One of thepedestals 3 is yprovided
with a rectangular transverselypositioned slot
(i in the outer leg and a similar slot 6’ in the 50l
inner leg and both pedestals 3 and 3’ are pro
vided with round apertures 'l and 1’ positioned
in the outer and inner legs respectively at the
center line and nearthe bottom thereof. An
arched cover plate» ß is mounted on the upper
6.5.'
2
2,134,122
edges of the outer legs of the pedestals 3 and 3'
are positioned at the center of the radius of curva
_ as shown in Figures 3 and 10. On the longitu
dinal center line of this cover plate and near
ture of the arcuate prongs 28 and 29', cover plate
8, the arched surfaces of the respective cam
plates I6 and I1 and the curved slots 22 and 22’
as is indicated by Figures 4, 5 and 8 of the draw
ings. By reason of this concentric pivotal mount
ing the respective sets of prongs are enabled to be
each end thereof are positioned longitudinal slots
II and I2 and an intermediate round aperture
I3. The cover plate is also provided with two
smaller longitudinal arc-shaped slots I4 and I4’
positioned near the side edges thereof. A flat
base plate I5 formed with upward projecting
moved toward or away from each other both lat
the inner legs of the pedestals 3 and 3’ as shown
erally and longitudinally in constant alignment
and with perfect registration with respect to the 10
perforations in the leaves.
in Figures 3 and 10. On the longitudinal center
line of plate I5 are positioned longitudinal slots
For the purpose of actuating and controlling
the movement of the respective sets of prongs to
10 flanged edges is mounted on the upper edges of
II’ and I2' and an intermediate round aperture
ward or away from each other laterally, are pro
I3' identical with and arranged directly below
slots II, I2 and aperture I3 respectively in the
vided the actuating pins 33 and 33’ projecting 15
through the longitudinal slots II and I2 in the
cover plate. Base plate I 5 is alsov provided on its
under surface with an extruded pin 49.
cover plate 8, the diagonal cam slots 23 and 23’ in
the cam plates I6 and I1 and the longitudinal
slots II' and I 2' in the base plate I5, all of the
respective slots being in proper alignment to re 20
ceive the said actuating pins, as clearly indicated
in Figures 3 and 8 of the drawings. As illus
trated particularly in Figure 3, these pins are con
nected by a connecting link 34 which is in the
nature of a channel, as shown in Figure 8, with
apertured ears 35 .and 35’ accommodating the re
Arranged between the cover plate 8 and base
20 plate I5 are the left and right angle or cam
plates I6 and I1. The left cam plate I6 is- formed
with an arched surface merging at the left side
into an upwardly projecting flange I8 terminat
ing in self-formed interlocking type hingeY
25 knuckles I9 and is provided at each end with
downwardly extending triangular-shaped leg ex
tensions 20 at the apexes of which are positioned
spective pins 33 and 33'. By reason of this link,
round apertures 2| and the forward leg extension
only being further provided with a curved slot 22
30 as illustrated clearly in Figure 9. Positioned one
adjacent each end of the arched surface of the
both pins must move exactly the same distance
and in the same direction at the same time, con
stituting what may be termed a reciprocating 30
cam plate are two exactly similar diagonal cam
slots 23 terminating at one extremity in the re
verse extensions 24, and intermediate the said
35 cam slots are positioned the approximately T
slideY comprising the said actuating pins 33 and
33’ and the connecting link 34, the range of travel
being limited by the longitudinal slots II and I2.
By reason of the divergent angularity of the cam
slots in the cam plates I6 and- I1, the respective 35
shaped guide slot 25, a transverse shift slot 26
and the clearance notch 21, as clearly shown in
Figure 9. Mounted on the flange I8 is a prong
plate 28 carrying a series of equally spaced arcu
40 ate prongs 29 upon which are impaled the leaves
sets of prongs carried thereby are caused to move
laterally toward and from each other by a corre
sponding longitudinal movement of the said re
ciprocating slide. The lateral movement of the
30 with equally spacedmarginal perforations 3|,
the said prongs being spaced on centers equal to
four times the distance between centers of the
said perforations.
45
'I'he right cam plate I1 is substantially a
so
counter part of the left cam plate I6, except that
it is positioned in a telescoping arrangement in
side of cam plate I6, as shown in Figure 3. The
right cam plate I1 is likewise formed with an
arched surface merging at the opposite or right
side into an upwardly projecting flange I8' termi
nating in similar hinge knuckles I9’ and provided
at each end with similar triangular leg exten
sions 20' with apertures 2I’ positioned at the
55 apexes thereof and the forward leg only being
further provided with a curved slot 22’ but which
legs are spaced closer together than and enabled
to be reciprocated inside the legs 20 of the left
cam plate I6.
60
Similar diagonal cam slots 23' and
extensions 24', guide slot 25', transverse shift slot
26’ and clearance notch 21’ are provided in the
arched surface of cam plate I1. An exactly simi
lar prong plate 28’ carrying a series of equally
spaced arcuate prongs 29’ is mounted on the
65 flange I8’ but staggered with relation to the op
posing set of prongs 29 a distance equal to tHe
distance _between centers of two consecutive per
forations in the leaves, as indicated in Figure 1
of the drawings.
70
Projecting through the apertures 1 and 1' in the
pedestals 3 and 3’ and the similar apertures 2I
and 2| ’ inthe triangularrleg extensions of the re
spective cam plates I6 and I1 are positioned the
round fulcrum pins 32 and 32'. It is t0 be par
75 ticularly pointed out that the said fulcrum pins`
'
respective telescopic cam plates by the actuating 40
pins is simultaneous and in opposite directions
relative to each other and of substantially equal
distance relative to the longitudinal center line of
the unit. The pivotal arrangement of the leg
extensions of the cam plates, together with the
cam action of the angular slots, cooperate to
cause the cam plates to move easily and freely
back and forth during’ the manipulation of the
device and to maintain the respective sets of
prongs rigidly in alignment so that the turning
of the leaves impaled thereon from side to side
can be done smoothly.
For the purpose of actuating and controlling
the movement of the respective sets of prongs
toward or from each other longitudinally of the 55
unit, a shift lever 36 is provided. This lever is
pivotally mounted on the extruded pin 4'9 on the
under surface of the base plate I5. The lever 36
is in effect triangular shaped constituting what
may be termed a T-lever and carries pins 31 and 60
31’ which extend upwardly through the trans
verse shift slots 26 and 26' in the cam plates I6
and I1 respectively and through the arc-shaped
slots I4 and I4' in the cover plate 8. The clear
ance notches 21 and 21' are provided to prevent
interference of tlïe edges of the respective cam
plates with the shift pins 31 and 31’ when in the
fully-closed position shown in Figure 6 of the
drawings. 'I‘he actuation of the T-lever causes
the simultaneous longitudinal movement of the 70
respective cam plates I6 and l1 an exactly equal
distance in opposite directions.
For the purpose of manually actuating the re
ciprocating slide and the T-lever, the L_J-shaped
member 38 is provided which is formed with legs 75
2,134,122-
3
°
of unequal length swingably mounted or pivoted
of'` the transverse slot 6. This movement will
on the actuating pin 33, as illustrated in Figure 3,
and in the performance of its two functionsin
operating the device it constitutes what may be
termed a swingable operating member, By rea
son of its connection with the’rec'iproca'ting slide,>
through the actuating pin -33, it forms a part of
a sliding system and acts therein asv the pusher
or tractor of the said reciprocating slide. The
10 lower and longer leg of the member 38 is pro
vided with a longitudinal slot 39 terminating at
actuate the T-l`ever to shift the cam plates sunl
ciently to cause the prongs to move two steps in
opposite directions longitudinally of the back, or
one end in ¿an enlargement 46. The T-lever 36
also carries a pin (il e which loosely extends
through the slot 39 and, by reason of this sliding
15 connection, the T-lever 36 and the swingable op
erating member 38 form a compound lever sys
tern, whereby,Y when the member 38 acting in this
instance as a- lever, is swung on its pivot, it will
actuate theT-lever accordingly._v Concerningthe
20 enlargement 4!) inthe slot 39, this is particularly
providedin order thatthe‘head ofV pin 4I >in the
assemblage of parts may pass'l therethrough, so
that the pin may be Ymaintained in engagement
with the slot throughout the sliding movement.
In the operationof actuating the reciprocating
25
slide to move the respective sets of prongs to
ward or away from each other transversely of the
back, the swingable operating member 38 is pref
erably designed to be advanced or retracted with
30 its longitudinal center line coinciding with the
longitudinal center line of the cover plate as
shown in Figures l and 6. Thelooped end is pre
vented from movement to the left. of the said
center line of the cover plate in Figure l by reason
of the pin 4I of the T-lev-er projecting through
slot 39 and which pin is prevented from move
ment to the right of the said center line of the
cover plate by the lever pins 3l and 3l' reaching
the limit of their movement in the slots I d and I4’
40 in the cover plate, and lateral movement is fur
ther limited by the transverse slot 6 in the outer
leg of pedestal 3 through which the lower leg of
member 38 passes. The looped end of the swing
able operating member is thus confined to move
ment only to the right of the longitudinal center
line of the cover plate, and the range of this latter
movement is controlled and limited by the trans
verse slot 6 coacting with a notch ¿i2 merging into
an oiîset notch ¿i3 properly positioned in the
lower leg of the said operating member and act
ing as a two-step guide, as shown in Figures 6 and
'7. Movement of the looped end of the swing
able operating membertß to the right of the
longitudinal center line of the cover plate is for
55 the purpose of actuating the T-lever to move the
prongs to the shift positions. For instance, when
it is desired to thus shift the cam plates, the
parts are moved substantially to the position
shown in Figures 2, 5 and 7. When the swingable
operating member 38 is swung to the right. such
lateral movement is limited by the notch ¿i2 con
tacting the end cf the transverse slot 6. This
movement 'will actuate the T-lever to shift the
cam plates sufiiciently to cause the prongs 29 and
65 29' to move one step in opposite directions lon
gitudinally of the back, or a total combined dis
tance equal to the distance between centers of the
perforations 3l in the leaves 3d. which may be
termed the single shift position. as illustrated bv
70 the solid lines in Figure 2. If it should be desired
a totalv combined. distance yequal to twice the
distance between centers of the perforations in
the leaves, which may be termed the double shift
positions, as illustrated by the dotted lines in Fig
ure 2.
`
'
`
’
"
Itis to be especially noted that by reason of the 10
telescopic arrangement of the left and right cam
plates and their respective leg extensions, and
particularly by reason of the spacing between the
_leg extensions of the left cam plate being greater
than the spacing between those of the right cam 15
plate, the latter is'enabled to be reciprocated
along the fulcrum pins 32 and 32’ inside the left
cam plate leg extensions in the operation of shift
ingthe respective sets of prongs longitudinally.
Likewise the leg extensions of the‘left cam plate 20
are properly spaced to enable them to be recipro
cated along the fulcrum pins inside the outer legs
of the pedestals 3 and 3’.
`
ltl is to be noted that in the normally closed
position of the binder,'the respective sets of the 25
arcuate prongs are fully overlapping, as shown
in Figures l and 4, that is, the prongs 29 mounted
on prong plate 26 extend fully across the cover
plate to the opposite prong plate 28', and vice
versa. When the parts have been moved to the
single or double shift position, the respective sets
of prongs are only partly overlapping, as shown
in Figures 2 and 5. For the purpose of separating
the respective sets of prongs sufñciently to create
a gap between them for the insertion or removal
of leaves, as shown in Figureß, the swingable op
erating member 3S is pulled outwardly, causing
the reciprocating slide to reach the limit of its
corresponding movement in the longitudinal slots
I l and I2, the Obliquity and length of the diagonal 40
camY slots> 23 and 23’ being such as to accomplish>
the reeuired movement of the cam plates.
For the purpose of locking the cam plates in the
fully closed position shown in Figures l and 4,
the cam slot extensions 24 and 24' are provided.
When the swingable operating member 38 is
pushed inwardly, causing the reciprocating slide
to reach the limit ofl its corresponding movement
inthe longitudinal slots Il and I2, the reverse
Obliquity of the respective cam slot extensions 24 56
an-d 2li' will then act to ñrmly hold the actuating`
pins 33 and 33’ against accidental movement.
>For the purpose of preventing end thrust of
the camplates, except when desired at the shift
positions, the ñxed ,cam plate guiding pin 4A is
projected through the round apertures I3 and I3’
in the cover plate 8 and the base plate I5 re
spectively and passing through the T-shaped
guide slots 25` and 25’ in the cam plates I6 and
I‘I respectively. The legs of the respective T 60
shaped slots extend in opposite directions and are
parallel with the corresponding diagonal cam
slots. This arrangement permits the cam plates
to moveV freely back and forth laterally as desired
but the longitudinal movement thereof to shift
the various prongs 29 and 29’ is only possible
when the guiding pin 44 is opposite the openings
to further move the prongs so as to shift the
or legs of the respective T-slots or in what may
be termed the shift position. It will be seen that
the guiding pin M thus acts to prevent end thrust
of the cam plates _in the closed position shown
same two steps, the swingable operating member
38 is pulled longitudinally from the single shift
position above described and then swung further
to the right until the notch ¿i3 contacts the end
Positioned in engagement with the hinge `
knuckles I9 and I9’ on the upper edge of the »
in Figurel 6 and at all other times except the
shift positions shown in Figure '7.
4
2,134,122
Iianges I8 and I8' of the cam plates I6 and I1
are the hinge leaves_45 and 45’ carrying the
complementary hinge knuckles 46 and 46’ piv
otally mounted onhinge pins 41 and 41'. At
tached to the respective hinge leaves are the
side covers 48«and 48’ which may be made of
any suitable material such as, for example, can
vas “bakelite”. It is to be pointed out that the
to four times the said distance. The points or
free ends of the said prongs overlap the longi
tudinal center line of the unit in the fully closed
and shift positions shown in Figures 1, 2, 4 and 5,
but not in the fully opened position shown in
Figure 8, the said points in this instance having
been separated sufliciently to create a gap for
respective sets of hinge knuckles are formed with
the reception and removal of-leaves. The prongs
of one set -are staggered with respect to those of
notched extremities, as particularly illustrated in
Figure ll, and form what may be termed inter
locking hinges. The notches are so disposed as
longitudinally of the pedestals in the spaces be
the opposing set and arranged to be reciprocated 10
to limit the swinging movement of the side covers
and are particularlyadapted to permit the side
tween the latter prongs. In their staggered ar
rangement and while in their normal or what
may be termed non-shift relationship as shown
covers to `be laid open while the prongs are in'
their fully closed or open relation, as in Figures 4
in lFigures 1 and 4, as contrasted with their single l5.
and double shift positions as shown in Figure 2,
and 5, but to limit the reverse or closing move
ment of the side covers to a plane parallel to
each individual prong of one set is positioned in
the space between the two immediately opposite
the plane of the flanges I8 and I8' of the _cam
plates as in Figure 8. This arrangement enables
the binder to be closed from a fully open posi
tion of the prongs as in Figure 8, or any inter
mediate position such as Figure 5 by lifting the
side covers.
By reason of this interlocking fea
25 ture the cam plates are actuated by the upward
movement of the side covers and their respective
diagonal cam slots exert a pressure on the actu
ating pins 33 and 33’ to move them accordingly
thereby causing the sliding system to follow the
30 movement of the pins to a closed position ofthe
binder. It is to be noted that when the parts are
arranged for the shift position the actual shift
ing of the prongs may be accomplished by move
ment of the side -covers `in opposite directions
longitudinally of the back. While the lateral
movement of the prongs from a fully closed to
a partly open or full open position is preferably
accomplished by the manipulation of the swing
able operating member 38, it is obvious that the
40 operation of closing the- prongs laterally or shift
ing the same longitudinally may be accomplished
either by manipulation of the operating member
38 or «the side covers 48 and 48’ at the choice of
the operator.
It is to be especially pointed out that the move
ment of the respective cam plates and the prongs
mounted thereon is always simultaneous and in
opposite directions; that they are constantly
maintained in their relative lateral and longi
tudinal positions against accidental movement of
one cam plate independently of the other; that
the two longitudinal movements of the said cam
plates can only occur at one iixed, partly open
position at which time the points of the opposing
66 sets of prongs are still overlapping suiiiciently to
prevent accidental spilling of the leaves in turn
ing the same from side to side and that the
respective opposing sets of prongs being formed
to the same radius and having a common ful
60 crum at the center of the radius of curvature are
thereby maintained rigidly in alignment to insure
proper registration of the prong points with the
perforations in the leaves.
The said prongs are thus mounted in a straight
65 line on the respective cam plates. They are arcu
ate in form, arranged to lie in parallel Vertical
planes transversely of the back, and grouped in
two opposing sets of equal number, the said sets
cooperating to receive and impale leaves the mar
70 gins of which are uniformly perforated at regu
lar intervals. The prongs of each respective -set
are permanently spaced apart at regular inter
vals equal to a multiple of the distance between
centers of any two consecutive perforations in
75 the leaves and which may, for example, be equal
consecutive prongs of the other set nearer one
of the two than the other and at a point equal to 20
one fourth the distance between them, the said
distance being the equivalent of the distance be
tween centers of any two consecutive perforations
in the leaves. The respective individual prong
members of one set in conjunction with the cor
25
responding individual prong members of the other
set form a series of pairs of adjacent overlapping
prongs cooperating to form a plurality of arches
on which leaves impaled thereon may be turned
from one set of prongs to the other. The dis 30A
tance between the two individual prong members
forming each of the said arches, while in their
non-shift relationship shown in Figure 1, estab
lishes what may be termed their normal lateral
spacing.
'
Referring to Figure 1, it will be seen that in the
normal or non-shift position of the respective sets
35;
of prongs, a series of every fourth perforation in
the leaves impaled upon the set of prongs 29’ co
incides and registers with the said set, and, as
the said leaves are turned to the opposite set of
prongs 29, a second series of every fourth perfo
ration next adjacent to the iirst mentioned series,
coincides and registers with the said set of prongs
29. By reason of the means for reciprocating the
prongs of one set in the spa'ces between the prongs
of the opposing set, the distance or lateral spac
ing betwen the two members of each of the said
arches may be increased from that of the normal
or non-shift relationship. When the respective
sets of prongs are moved to the single shift posi
tion, as shown in Figure 2, the said lateralspacing
is increased to exactly twice that of the normal or
non-shift position, or the equivalent of twice the
distance between centers of any two consecutive
perforations in the leaves whereby, when the
leaves impaled upon the vset of prongs 29’ are
turned to the opposite set 29, a third series of
every fourth perforation in the leaves, next in
order to the last above mentioned, coincides and
registers with the set of prongs 29. When the
respective sets of prongs are moved to the double
shift position as shown by the dotted lines in Fig
ure 2, the said lateral spacing is increased to ex
actly three times that of normal, or the equivalent
of three times the distance between centers of the
said perforations whereby a fourth progressive
series of the said fourth perforations coincides
and registers with the set of prongs 29 when the
said leavesare turned from prongs 29'. In the
fully opened position of the respective sets of
prongs, as in Figure 8, the said lateral spacing be
tween the two adjacent members of any adjacent
55
60
65
70
arches is exactly the same as that of normal.
Inthe operation of the binder the leaves are 75
5
2,134,122
placed on the respective prongs 29' starting from
the bottom and are overlapped as shown in Fig
ure 1 with the lower name bearing marginïex
posed. The leaves are preferably designed to be
of a size to include multiples of four and a mini
mum of eight marginal perforations `equally
spaced and the prongs of each respective set are
spaced on 'centers equal to four times the distance
between centers of the said perforations so that
io each leaf will at all times be held in place by .at
least two prongs in the case of eight perforations
and three prongs in the case of twelve perfora
tions.
The opposed sets of prongs are .equally spaced
and the two sets of prongs are offset with relation
to each other exactly the‘distance between .cen
ters of the said perforations. The leaves are
preferably provided with a marginal space at the
lower right hand corner of the face and the upper
20 left hand corner of the back thereof for >inserting
the name of the account or other index .of the
record therein contained.
If, for example, the leaves bear the names of
accounts arranged in alphabetical order and it is
25 desired to enter anew account in its proper place,
all the leaves of the section or page are ñrst
turned by hand from prongs 29’ to register on
the opposite set of prongs 29 and the swingable
operating member 38 is then manually actuated
30 to arrange the parts for a single shift position
as shown in Figure 2, the notch 42 controlling
and limiting the movement of the prongs. All
the leaves below the point at which it is desired to
insert the new leaf are then swung back to
prongs 29’ and the swingable operating member
38 returned to a position along the longitudinal
center line of the unit whereby a space is created
for the insertion of the new account. The swing
able operating member 38 is then extended to the
full open position of the prongs, Aas illustrated
in Figure 8, and the new leaf inserted on prongs
29’ in the space thus provided. The swingable
operating member 38 is then restored to its fully
‘closed position, as in Figures 1 and 4, and the
operation is complete.
'
If it is desired to remove a leaf and insert a new
The member 50 is lpreferably formed as anoflî
set bar each section thereof being substantially
the same `width as the swingable operating. mem
'ber 33 and the transverse slot 5 through which
both members pass and is provided with a round
aperture 5| at its inner end, a primary offset
step 52 merging into asecondary step 5_3 at one
:side and an oblique offset 54 at the opposite
side positioned at the junction of the offset
sections in proper- relation to the notches 42
and 43 in the said operating member 38, and a 15
locking notch `55 near the opposite end, the
said bar merging into a transverse looped ex
tension >5.3 at its outer end as clearly shown
in Figure 15.
‘
The member 50 lis positioned between the lower 20
leg of the operating member 38 and the base
plate I5 being swingably mounted at its aper
ture 5I on the actuating pin 33 and arranged
to pass through the transverse slots 6’ and 6
in the inner` and outer legs of pedestal 3 and 2.5
`the curved slots 22 and 22’ in the leg .extensions
42i) and 20’ of the vcam plates. The end eXten
sion 56 is positioned outside the outer leg of
pedestal 3 for convenient manual movement lat
erally with the loop thereof encircling the low 30.
er leg of the operating member 38e-nd arranged
to permit independent lateral movement of the
latter, as illustrated in Figures 13 and 14. By
reason of its .connection with the sliding system
through the actuating pin 33, the longitudinal
movement of the member 50 is identical there
with.
Referring toFigures 12 and 13 the swingable
catch member 50 is shown in its fully closed and
locked position, the sliding system having been
pushedinwardly to the limit of its movement
thereby actuating the respective sets of prongs
to their fully closed relation as in Figure 4 and
the looped end extension 55 having been swung
laterally to the right so that the end wall of the 45
transverse slot :6 has entered the locking notch
55 whereby the sliding system is prevented from
accidental outwardalongitudinal movement.y
change are swung from prongs 29’ to prongs 29
while the leaf to be removed and all those below
For the purpose of .actuating the cam plates
to separate the respective sets of prongsv laterally
from their closed relation as in Figure 4 to their
partly open or shift positions as in Figure 5, the
looped end extension v56 is manually swung >to
the left whereby the locking notch 55 is disen
gaged from the end wall of the transverse slot 55
6 so that the stern of the member 58 is properly
change effected.
If Vit is desired to remove a single leaf and close
55 in the gap, the leaves above the removal point
are swung to prongs 29, the balance remaining on
prongs 29', and the swingable operating member
38 is actuated to the full open position of the
prongs as in Figure 8 and the leaf removed. The
swingable operating member 38 is then actuated
to the single 'shift position, Figure 2, and the
leaves remaining on prongs 29' are turned to
prongs 29. The swingable operating member 38
is then restored to its normal closed position,
Figure 1.
'
If it is desired to remove two adjacent leaves
and close in the gap, the same procedure is fol
lowed except that the double shift notch 43 is
70
their fully closed relation, shown in Figures 1, 4
and 6, against` accidental movement.
one in its place, the leaves above the point of
it remain on prongs 29’. The swingable operat
ing member 38 is then actuated to the full open
position of the prongs as in Figure 8 and the
60
of prongs laterally and for the further purpose of
providing a means of lockingv the said prongs in
used instead of the single shift notch 42.
In the modification illustrated in Figures 12 to
15 inclusive, a substantially T-shaped swingable
catch member or locking bar 5G is employed for
the purpose of providing a positive stop at the
shift positions, shown in Figures 2, 5 and 7, in
75 the operation of separating 4the respective sets
'
aligned for longitudinal movement through the
said slot. `Thereupon _the sliding system is ad
vanced llongitudinally outward either by the man
ual actuation of the operating member 38 or by 60
the manual separation of the respective sets of
prongs, at the _choice of the operator, ,until the
primary oifset step 52 contacts the inner .surface
of the outer leg of the pedestal .3 ,andarrests
furthe-r movement-of the parts at .the single shift 65
position as clearly -shown in Figure 14. The
primary notch 42 in .the lower leg .of the swing- `
able» operating member 38 is thus properly posi
tioned to permit of sufficient independent lat
eral movement of 4the latter to accomplish the
single shi-ft operation .previously described.
In >order to arrange -the parts for the double
shift operation, the looped end .extension ,55 'is
manually actuated from the position shown in
Figure 14 Ain the direction indicated by the ar
7-9
2,"13 4571 22
row "‘A” sufficientlyl tof‘disengagev the primary said respective actuating pins extend, said last
6
Cl
Y
o
step 52,y the oblique" oifset54 at the opposite side
of the stem permitting of such lateral movement,
mentioned slots extending longitudinally vof said
back and sliding means for actuating said pins
so that when the swingable operating member
38 is actuated to advance the sliding system still'
further longitudinally in the direction indicated
so as to move the pins along said slots whereby
said prongs are moved transversely of the back 5
by the. arrow “B”, the secondary step 53 in turn
contacts the inner surfacev of the outer leg of
pedestal 3 and arrests further> movement of the
parts at the double shift position. The second
ary notch 43 is thus properly positioned to per
mit of sufficient independent lateral movement
ofthe member 38 to accomplish the double shift
operation previously described.
A15
If it is now desired 'to arrange the parts to
the fully open relation of the prongs shown in
Figure 8, the .looped end extension 56 is man
ually actuated in the direction of the arrow “A”
in Figure 14 sufficiently to disengage the sec
20 ondary step 53 and the sliding system advanced
longitudinally in the direction of the arrow “B”
to the limit of its> movement.
In the operationV of restoring the respective
sets of prongs from their fully open relation
25 last above described or from their shift positions
to their fully closed relation, the‘sliding system
is retracted longitudinally in the opposite di
rection to that indicated by the arrow “B” and
by reason of the oblique oifset 54 contacting the
30 end wall of the transverse slot»6 in passing, the
swingable catch member 50 will be swung there
by in the opposite direction to that indicated by
the arrow “A” whereby the offset step 52 is auto
matically restored to a position to arrest the out
A35 ward movement of the sliding system at the
single shift position in the next successive opera
tion of separating the prongs.
’ While I have illustrated and described what I
believe to be’the» preferred embodiment of my
invention, it is obvious that changes may be
made in the general form and arrangements of
the parts Without departing from the spirit of
45
the invention;A hence I do not limit myself to
the specific details set forth but consider my
self at liberty to make such changes and altera
tionsvasfairly fall withinfthe scope of the claims.
I
50
55
claim:
'
'
1. A loose leaf binder, including a rigid back, -a
ñxed pivot carried by said back, a pair of con
centric arcuate >cam plates mounted at their
common centers on said pivot, curved prongs op
eratively connected to the cam plates and con
centric therewith, and means for moving the cam
plates and prongs relative to each other.
2. A loose leaf shift binder, including'a rigid
back, a fixed pivot carried by said back, a pair of
concentric arcuate cam plates longitudinally slid
ably mounted at their common centers Von said
pivot, curved prongs operatively connected to the
60 cam plates and concentric therewith, and means
for moving the cam plates and prongs relative to
each other both longitudinally and transversely.
3. A loose leaf binder including a rigid back, a
base plate carried by said back, an arcuate cover
65 plate carried by said back, a ñxed pivot carried
by said back, a pair o1"l concentricarcuate' cam
plates arranged between the base plate and cover
plate and mounted at their common centers on
said pivot, a set of arcuate prongs carried by
each of said cam plates and concentric there
with, said prongs extending transversely of the
back,V said cam plates each having an inclined
slot at each- end, actuating pins extending through
said slots, said base plate and said cover plate each
76 having -a slot adjacent each end through which
for opening and closing.
4. A loose leaf shift binder including a back,
a fixed pivot carried by said back, a base plate
carried by said back, an arcuate cover plate car
ried by said back, said base and cover plates hav 10
ing identical longitudinal slots adjacent each end,
a pair of concentric arcuate cam plates, each plate
having a bent-down triangular end leg extension,
one plate and its extension telescoping within the
other plate and extension, the said leg extensions 15
being fulcrumed at the common centers of the
cam plates on the said pivot, said cam plates
being provided with substantially identically
formed inclined slots withthe slots in one plate
extending at the opposite angle to the slots in 20
the other, a set of arcuate prongs concentric with
and carried by each of said plates, actuating pins
extending through the slots in the respective
cam plates and the said base and cover plates, a
link connecting said actuating pins, means for 25
moving said link so that said pins will cause the
cams to move said prongs in opposite directions
transversely of said back, and swingable means
for moving said cam plates in opposite directions
longitudinally of said back.
30
5. A loose leaf binder including a back, a pivot
secured to said back, a base rigidly secured to
said back, an arcuate cover plate mounted at its
ends on supports attached to said back, a pair
of concentric arcuate prong-carrying cam plates
arranged between said base and said cover plate
and mounted at their common centers on said
pivot, each of the said cam plates having a pair
of inclinedv slots, said base and said cover plate
having longitudinal slots, there being a group of 40
said slots at each end of the binder, an actuating
pin extending through each group of slots, a link
connecting said actuating pins, and a hand op
erated member connected to one of said actuat
ing pins for moving said actuating pins whereby 45
said cam plates and the prongs carried thereby
may be moved transversely of said back.
6.»A loose leaf shift binder including a rigidback, a fixed pivot carried by said back, a pair
of concentric arcuate cam plates longitudinally
slidably mounted to fulcrum at their common
centers on said pivot, each of said plates _having
transverse slots, and carrying a group of arcuate
leaf-receiving prongs concentric therewith, means
for moving said groups of prongs toward and
from each other, and means for shifting said
groups of prongs longitudinally, said latter means
including a lever having pins extending into said
slots and means for swinging said lever Ifor si
multaneously moving said cam plates and said
groups of prongs in opposite directions.
7. A loose leaf shift binder including a rigid
back, a fixed pivot carried by said back, a pair
of concentric arcuate cam plates longitudinally
slidably mounted to fulcrum at their common
centers on said pivot, each cam plate having a
group of arcuate prongs concentric therewith,
manuallyactuated slide means operatively con
nected with said plates for moving them simul
taneously in opposite directions laterally, and
lever means operatively connected with said
plates for moving them simultaneously in oppo
site directions longitudinally whereby the respec
tive prongs are shifted correspondingly.
_ 8. A loose leaf shift binder including a rigid
50
55
00
05
7.
12,1184, 122
back, a fixed jpivot carried by’said back, a 'base
plate mounted on said back,fan arched cover
plate mounted on said back, a pair'of concentric
arched cam plates arranged between said'base
and cover plates. and longitudinally' slidably
mounted to fulcrum at their common centers on
said pivot, each cam plate having a transverse
slot,'a diagonal Yslot and a group of leaf-receiv
ing arcuate prongs concentric with said cam
10 plate, a manually actuated swingable operating
member provided with a slot extending longitu
dinally thereof at >one end, an actuating pin upon
which said‘swingable operating membery is piv
oted and which extends through said diagonally
positioned slots whereby when said swingable op
erating member is operated to move said actu
ating pinf longitudinally of the cam .plates said
cam plates will be moved transversely of the
back, a substantially T-shaped lever, a fixed pivot
for said lever secured to said base plate,` said
pivot being mounted at the junction of' the arms
of the lever and a substantially equal distance
from the end of each transverse arm, means ex
tending from the ends of the said transverse
2.5 arms of the T-lever into'saíd transverse slots
and a shift pin extending through the slot in
said swingable operating member, said shift pin
being ñxed to the third arm of said T-lever
whereby when said swingable yoperating member
30 is swung on said actuating pin said T-lever will
be swung on its pivot and thereby movesaid cam
into said slots, said pivoted ’operating member
having a longitudinally positioned slot, a pin ex
tending through said slot and into said lever
whereby when said operating member is swung
on its pivot it will automatically swing said lever
for the longitudinal movement of said cam plates
and said prongs carried fthereby. .
12. A loose leaf shiftbinder including a back
having a rigid end wall, a pair of concentric
arched cam plates pivotallyand longitudinally 10
slidably mounted at their common centers on
said back, each plate having a‘group of arched
leaf-receiving prongs concentric therewith, a
sliding system comprising a swingable operating
member together witha reciprocating slide co-n 15
nected withl the said plates .for‘shifting them
by cam,.action transversely, a> compound lever
system comprising the said swingable operating
member together with a -pivotally mounted T
lever connected with .the said plates for moving 20
them longitudinally, a primary and secondary
notch positioned .in .one leg of the swingable
operating member, said secondary notch being
offset from` the-primary notch, the end wall of
the back having a; slot therein'through which 25
the said leg of .the swingable operating member
slides longitudinally but which limits the lat
eral swinging vof the 'said leg, the said primary
and secondary notches being’ adapted to receive
an end wall »of said slot and permit a certain 30
amount of swinging of said.A operating member
plates longitudinally of the back for shifting said
whereby the degree of longitudinal shifting of
groups of prongs.
said prongs is governed.
I
f
l
~
9. A loose leaf shift binder comprising a rigid
85 back, a pair of concentric arcuate prong ycar
riers
pivotally
and
longitudinally .xslidingly
mounted at their common centers on said back,
a pluralityof arcuate prongs mounted on the
carriers concentric thereto and adapted toJre
ceive leaves,.and lever means for' shifting Asaid
respective prong carriers simultaneously and in
opposite directions longitudinally of said back,
whereby said leaves may be advanced or retracted
along the binder.
. '
.
.
13. A loose leaf shift binder including a rigid
back, twoV concentric arcuate cam plates pivot
ally and longitudinally slidably mounted at their
common `centerson said back, each cam` plate
kcarrying va group of arcuate prongs concentric
with the said cam plates, a manually actuated Y
swingable operating member operatively con
nected with .said camV plates'for moving them
laterally, and a lever structure formed with
lmeans operatively connected with the swingable
operating member and the cam plates for mov
`
l0. A loose leaf shift binder including a-,rigid
45
back, a Viixed fulcrum pin carried by said back,
a pair of concentric arcuate cam plates carried
by said back longitudinally slidably mounted
ing the latter longitudinally, whereby the respec
tive prongs are moved in like manner. `
~
14.‘A loose leaf shift binder kincluding a back,
a base rigidly secured to saiduback, an arched
cover plate rigidly secured to said back, a pair
to fulcrum at their common centers on said ful
crum pin, a group of arcuate prongs carried by
each plate concentric therewith, and >a slide
mechanism connected with said-plates Yfor simul
of concentric arcuate cam plates arranged be 50
tween said base- and said cover plate pivotally
taneously shifting the said plates and the prongs
thereon relatively in opposite directions trans
common centers on said back, each »cam plate
having a group of arcuate leaf-receiving prongs
nected with said plates for simultaneously shift
ing the said plates and the prongs thereon rela
being positionedsubstantially parallel to 'thev said
and longitudinally slidablyfmounted at their
versely of the back by positive cam -action `and ` concentric with and carried by the respective
cam-plates, a transverse slot, a diagonal slot, and.
an-accurately controlled lever mechanism con
tively in opposite directions longitudinally of
the back to positive intermediate and ultimate
positions.
`
’
l
1l.~A loose leaf shift binder including a rigid
back, a pair of concentric arcuate cam plates
pivotally and slidably mounted at their common
centers on said back, said plates vbeing movable
transversely and longitudinally relative to said
back, each of said plates provided Vwith a set
of leaf-receiving arcuate prongs »concentric there
with, a manually operated pivoted member -actu
- ating a sliding cam mechanism connected with
said plates for shifting said plates `transversely
of the back about their pivots, each of said plates
having a transverse slot, a lever pivotally mount
ed centrally on a ñxed pivot, means extending
" from the respective :arms :of the lever projecting
a substantially T-shaped 'slot the leg thereof
diagonal slot with the leg of one of the said T
slots extending in the opposite 'direction tothe 60
other, a manually actuated swingable operating
member provided -with a slot extending longi
tudinally thereof at one end, an actuating pin
upon which said’swingable operating member is
pivoted and which extends through said diago 65
nally positioned slots whereby when said swing
able operating member' is »operated to move said
actuating pin longitudinally oi lthe cama-plates
said cam plates will be moved transversely of
the back `about their pivots, a ñxed guiding pin
mounted between the said base and cover> plates
extendingr through said T-shaped Vslots whereby
the said cam plates wil-l be prevented from lon
gitudinal movement while they are being moved
transversely, la substantially 'T-shaped lever, -a
8
A2,134,122
fixed pivot ‘for said leveris’ecured' to said base
plate, said pivot being mounted at the »junction
of the arms of the T-leverand a substantially
equal distance from the end of each transverse
arm, means extending from the ends of the said
transverse arms of the T-lever into said trans
verse slots, and a shift pin extending through the
slot in said swingable 'operating member, said
shift pin being fixed to the thirdarm of said
10 T-lever whereby when said swingable operating
member is swung on said actuating pin said T
lever will be swung on its pivot and thereby actu
ate and control the movement of said cam plates
longitudinallyfor shifting said groups of prongs
15 the said fixed guiding pin acting to permit the
said longitudinal movement of the cam plates
only when it is in position to idle, in the longi
tudinal legs of the saidT-shapedY slots.
_
15. A loose leaf shiftV binder including a base
20 plate having a longitudinal slot, an arched cover
plate having a longitudinal slot identicalthere
with, a pair of parallel arched cam plates mount
ed between the said cover and base plates, each
of said cam plates having a transverse slot adapt
25 ed to receive a ñxed guiding pin, a diagonal cam
slot adapted to receive a movable actuating pin
and terminating at one end in an extension of
reverse Obliquity, a group` of leaf-receiving arcu
ate prongs carried by and concentric with each of
30 the said cam plates, an actuating pin extending
carried thereby, laterally to an open or closed
position, ksaid movement of the prongs acting to
permit leaves to be inserted or removed, and
lever means for shifting and controlling the rela
tive position of said plates and the prongs car
ried thereby longitudinally while they are in a
partly open position, said shifting of the prongs
acting to permit leaves to be advanced or re
tracted along the binder.
18. yA loose leaf shift binder including a rigid 10
back, a fixed pivot carried by said back, a pair
of concentric arcuate prong carriers longitudi
nally slidably mounted to fulcrum'at their com
mon centers on said pivot, a group of concentric
arcuate leaf-receiving prongs mounted on each
carrier and extending the full width thereof
transversely, reciprocating mechanical means for
moving the said carriers and the respective groups
of prongs mounted thereon under constant con
troltoward and away from each other and trans
versely of the back, said> movement permitting
20
leaves to be added, removed or replaced and
lever shifting means'for moving the said car
riers and the respective groups of prongs mount
ed thereon at a partly open position and under
constant control relatively longitudinally of the
back, whereby groups of said leaves may be
turned from side to side to shift them longi
tudinally of the back relative to other groups of
leaves.
>
80
Y
through the said longitudinal slots of the said
base and cover plates and the diagonal'slots of
the said cam plates, a manually actuated swing
able operating member pivotally mounted on the
35 said actuating pin whereby when the said swing
able operating member moves said actuating pin
longitudinally of the cam plates said cam plates
will be moved transversely tofopen and closed
positions, a fixed guiding pin mounted between
the said base and cover plates extending through
said transverse slots whereby said cam plates are
of the back forming substantially a portion of a
cylinder and adapted to receive leaves perfor
ated at regular intervals, the respective prongs
of each of the said sets being spaced apart equal
prevented from longitudinal movement, whereby
when the said actuating pinV is pushed by said
ly at a distance equal to a multiple of the space
between centers of any two consecutive perfora
. 195A loose leaf shiftbinder including a back,
two concentric arcuate prong carriers pivotally
and longitudinally slidably mounted at their com
mon centers on said back, two opposing inter
spaced and fully overlapping sets of identical
arcuate prongs mounted on the said carriers con
centric therewith and extending longitudinally
operating member to move the said cam- plates ' tions in the leaves, each individual prong of one
to their closed position the said actuatingY pin
at the limit of its movement in the said longi
tudinal slots in the base and cover plates will
enter the said reverse extensions of the diagonal
cam slots whereby the said camplates‘and the
prongs mounted thereon will be locked against
accidental lateral movement, the said ñxed guid
ing pin coacting to prevent longitudinal move
set being staggered with respect to and posi
tioned in the space between the two immediately
opposite consecutive prongs of the other set near
er one of the two than the other, the said indi
vidualprong members of one set forming'with
the respective individual prong members of the
opposite set a series of pairs of arches on which 50
leaves impaled thereon may be turned from one
ment of the said cam plates.
Y set of prongs to the other, the normal lateral
16. AA loose leaf shift binder Acomprising a
spacing between the two members of each of
55 rigid back, a ñxed fulcrum pin carried by said
back, a pair of concentric arcuate prQIlg Carriers
longitudinally slidingly mounted to fulcrum at
their common-centers on said pin, arcuate prongs
concentric therewith mounted on earch carrier,
a manually actuated operating. member, recip
rocating means connected with said operating
member for sliding the respective carriers simul
taneously in opposite directions> laterally 'and
lever means connected with said operating mem
ber for sliding the respective carriers simultane
ously in opposite directions longitudinally where
by the respective prongs are shifted accordingly.
17. A loose leaf shift binder comprising a rigid
back, a fixed pivot carried by said back, a pair
70 of concentric arcuate cam »plates longitudinally
slidably mounted to fulcrum `at their common
centers on said pivot, each of said plates carry
ing a group of arcuate leaf-receiving prongs con
centric therewith, reciprocating means for con
trolling and moving said plates andthe prongs
the said arches being equal to the said distance
between centers of any two consecutive perfora
tions in the leaves, means for sliding the said
carriers simultaneously `in opposite directions
transversely to a partly open position, mechani
cal means for sliding the said carriers simulta
neously in opposite directions longitudinally at
thesaid partly open position whereby the said
lateral spacingrbetween the two members of each
of the said _arches may be increased from that
of' the said normal by a progressive multiple of
the distance between centers o_f any two con
secutive perforations in the leaves.
,
20. A loose leaf binder including aìflxed back
having a rigid end wall, a fixed pivot carried by
said back, a pair of concentric arcuate prong 70
carriers mounted to fulcrum at their common
centers on said pivot, a set of arcuate prongs
concentric therewith mounted on each carrler,
longitudinally reciprocating means operatively
connected with` said carriers for rotating them 75
2,134,122
.
9
locking member may be swung on its pivot and
one end wall of the said slot will co-act with the
said olîset to arrest the movement of the said
locking member pivotally connected with the said prong carriers at a fixed intermediate point.
22. A loose leaf binder including a fixed back
reciprocating means having a notch therein near
one end, one end wall of the back having a slot - having a rigid end wall, a ñXed pivot carried by
therein through which the said locking member said back, a pair of concentric arcuate prong car
slides longitudinally but which limits the lateral riers mounted to fulcrum at their common cen
swinging thereof whereby when the prongs are in ters on said pivot, a set of arcuate prongs concen
tric therewith mounted on each carrier, longi 10
their fully closed relation the said locking mem
ber may be swung on its pivot and one end wall tudinally reciprocating means operatively con
of said slot will co-act with said notch to lock nected With said carriers for rotating them about
the said reciprocating means against accidental said pivot simultaneously in opposite directions
laterally to move the respective sets of prongs to
movement.
21. A loose leaf binder including a ñxed back open and closed relations, a swingable catch
having a rigid end wall, a fixed pivot carried by member pivotally connected with the said recip
rocating means having a projection at one side
said back, a pair of concentric arcuate prong car
and an oblique offset at the opposite side inter
riers mounted to fulcrum at their common cen
mediate its ends, one end wall of the back hav
ters on said pivot, a set of arcuate prongs concen
ing a slot therein through which the said catch 20
tric therewith mounted on each carrier, longi
member slides longitudinally but which limits the
tudinally reciprocating means operatively con
nected with said carriers for rotating them about ` lateral swinging thereof, whereby when the said
said pivot simultaneously in opposite directions reciprocating means are moved inwardly of the
laterally to move the respective sets of prongs to back to close the respective sets of prongs rela
open and closed relations, a swingable locking tively one end Wall of the said slot will co-act 25
about said pivot simultaneously in opposite di
rections laterally to move the respective sets of
prongs to open and closed relations, a swingable
10
15
20
25
member pivotally connected with the said recip
rocating means having’an offset projection at one
side intermediate its ends, one end wall of the
back having a slot therein through which the said`
30 locking member slides longitudinally but which
limits the lateral swinging thereof, whereby when
the prongsare in a partly open relation the said
with the said oblique offset to swing the said
catch member on its pivot so that the said pro
jection will be automatically set to contact the
said back end wall and arrest the movement of
the said reciprocating means at a given point
when moved in the opposite direction.
WALTER EASTER HASKIN.
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