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Патент USA US2110366

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March 8, _1938.
` s. G. JoHNsoN
Filed Feb. 8, 1936
2 Sheets-Shec + l
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' 2,110,366
Filed Feb. 8, 195e
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’ 2 sr\ee,»ts-she¢+v 2
» 5kg/¿yá‘foi/1502i
are preferably intensi with the mit. n dnd zi,
of the horizontally disposed operating key Il of
however, they may be formed separate there» the said locking- lever 4|. A suitably disposed
from `and. secured thereto in any suitable man
ratchet type detent Il secured to the angle 2l ~
or end piece 24 is engaged _by the locking finger
rtwiiibenotedtnnttneendpieœn n and 2s.
I! as the binder is closed from the position shown 5
and the end pieces Il and 2l cooperate with each
in Hg. 5 to the positions'shown in Hg. 4y and Hg.
other to 'form end closures at the U-.shaped back
3. ' When closing the binder the lockingßnger
3l. 'I‘hesaidpairsofendpiecesalsoserveasa
l! of the locking lever Il acts as a pawl or click
riding over the ratchet type detent Il. Any
numbernintcnetteetnmaybeundinthede ic _
tent yIl in order to provide alike number of par~
tially opened positions of the binder.
stinening a'nd guide means to maintain the 'up
lo standing legs of the hinged angles in their normal
position. 'lhe end closure comprising end pieces
26 and‘ It are straddled by a novel anti-racking
locking _lever as hereinafter described, the said“V
. The- cover assembly comprising front and backV y
locking lever being pivotally mounted on the‘end
covers 8i and it respectively and thou-shaped y
piece 2l.’
back Il are secured in the proper relationship to l5
The upstanding legs of angles 2l and Il are
the metal angle back by‘means yof rivets il
provided with a plurality of substantially frusto- , punched thi-ouah the said U-shaped back into
conical shaped depressions 21 having half` round
apertures 2l punched through the base of the said
20 depressions 21. The said apertures 28 are pref
erably arranged in the staggered relation indi
cated in Pig. 'I'in order that left hand prongs Il
and right hand prongs il may be seeured'to an
registrywith aperturesIfintheupiitandinglegii`>
of the
Il and back
2i. 'nie
il are
each provided
bottom sides
with 20
a punched binder board illier strip‘ll _and a se
euringstrip lapreferablyofpressedflberboard.
The finer strip Il has suitably spaced apertura
4I therein to receive the protuberances on tbs
25 prongs cooperate with eachother'toform aringv outside of the upstanding ieg of the anglesfll 25
when ythe binder is partially or fully `closed and and 2| land the Ahead Il formedon the butt end _the extreme or outsidel‘prongs of the binder are> of the leaf impaling prongs l’ and Il.. thereby '
opposite hand. When extreme prongs of the Y permitting the filler _strip I1 and the securing'V
gies Itandfl insuchamannerthatopposed
binder are oppositehand and positioned in oppo- «
30 sitely facing ‘directions the punched filler sheets
Il are more readily andsureiv luided and main
strip“ to be secured to the‘said metal angle f
back in parallel 'relationship thereto as best il- 3°
lustrated in Figs. l, 2, 3, 4„and 5. The center of»
'_the U-shaped back 33 is preferably notched 0l!`
binder in'its closed,partly opened andopen posi
the inside thereof as indicated by tllieliulnel‘al`
mupstnnding‘imœ mais :s and si ofthe
metal angle back are also» provided with aper'
- nin-the drawings tepel-mit sim-p centi-ni con
cdved sexing di the tnid u-'mnped mx u but; 3°
4shown in l'lgs. .4 and 5.
tures.: through which the U-lhabed back ’l is,` ‘ In the manufacture of loose leaf binders hav'
scribed.' Eachupstanding legofangles Il'andll
»40 is bent outward at its upper edge to provide a lon-i
gitudinally disposed
_strip u by.
means of which a neat abutment is made between
; the metal angle back and the flexible Joint-secur
45‘ing thefrontand back covers 8l and Il respec
tivelytothe U-shapedback Il.
inghaifroundopposed leaf impaiing prongs which`
cooperate with each other to‘form a ring when
culty of adjusting the opposed prongs into a`
position of accin'ate cooperation with eachother
has caused great expense inthe manufacture. A
material lesseningof cost of parts and the per
centage ofrejectsin themanufacture and assesn-` ‘5
Thebinge leg of the angle Il is -provided with ’bl'yof looseleaf binders of the split prong type
springuofthelockingdeviceinitsproper posi
60 tion.` An aperture Il through the end piece 2l
of the angle-2i is suitably disposed to receive a
` rivet la which securesthe locking lever 4I in piv
otal reiationshipto the end piece It.V
Referring now particularly ,to Pigs. 2, 3, 4, 5
55 and6.thenovellockingdevicecomprisesalocking lever. Il having a locking finger I2, an operat
ing key ‘I and an inverted U~shaped central por
‘tion u through which therivet Il secures the siiid>
locking lever Il in ypivotal relationship `izo-the
end llece 2l. _The central portion Il of the said
has been accomplished by thcherein disclosed
structure and’method of manufacture ofprongs`
and ‘angle backs. and the assembly of the prongs-`
intoptne mit hun roudwed-by, n anni adida- ‘5°
ment of the position of the entireprongiri;rie--` ‘
spect to the angle back ai’terassembly.l
In the 'angle back, as hereinbefore described. 1
theupstanding legs of the angles 2l and 2| are
provided with n plurality or nihstnntiniiy mist@ 5.5
conical shaped depressions 2"` having half round
apertures 28 punched through the base of the said
depressions". Referring to Figs. 18 and 17 it
will be noted thaty in forming the frusto-conical
locking lever Il bridges over or straddles the end i depressions that the metal at the periphery there'- . 00 t
piece 2l in such a manner that the spring 'Il ofïhas been drawn thinner than the metal at the
coiled around the rivet 4I maintains the locking _base of the depression 21 and thinner thanthe‘
i'ingerA ‘l ofthe said locking lever in suiilcient` metal of the angle back Il. i vAfter the prongsïll`
and“ are secured tothe base of the depressions '
65 spaced relationship to the end piece 2l as to per
mit the end piece Il to rotate between the said their position in relation to the surface of the' §45k
' finger 42 and the end piece 2t when the binder isv upstanding legs of angles 2l and 2| may be ad- '
being'opened and closed. 'me spring n eoii‘ed
around the rivet Il has one end'retaine'd in a
' .m nxed position Vnimmst tne’hinse ieg o: angie zi
' `between the inwardly disposed tab .l1 thmof and
the end piece” thereof. while the other end of '
the'spring 38 constantly urges the locking lever
4I to rotatetoward its locked position by means
‘15 of the'constant pressure exerted on the
justedby tripping the yprongs Il and 8l near the
shoulders It at the butt end thereof and changing
the plane of .thebase of the frusta-conical depres
sions I'I, an example of said adjustment being 70
by the dot and dashlines'll'inï '
It isessentialv that a pliable accurate prong'is
provided inasmuch as the aforementioned adiust- '
ment ofthe position of the prongs in relationto 75
3 .
the surface of the upstanding legs of angles 20
and 2| is not the only adjustment required after
assembly to assure the perfect registry of opposed
prongs; in many cases the prongs per se must
also be bent. It is impossible to mill the prongs
flat from an umet round Wire without leaving an
undesirable fillet between the flat surface and up
set head thereof. Die castings do not lend them
selves to pliability. Also, milled and die cast
10 prongs have been found to be from four to six
times as expensive as the making of half round
arcuate prongs by the method herein disclosed.
Referring now to Figs. 9 to 15 inclusive, round
Wire stock 5| is either rolled or extruded into
15 stock of the desired cross section which, in the
embodiment of the invention disclosed, is sub
stantially half round as indicated by the numeral
52 in Fig. 9. The stock is then cut into blanks
53 of the proper length as shown in Fig. 10.
The blanks 53 are then inserted into a holding
die 54 while a female shouldering and heading
die 55 is brought against the end of the blank 53
protruding from the holding die 54 to form a
shoulder 56 an'd a concaved butt 51 as indicated
25 in the drawings. The concaved butt 51 is pre
ferred to the usual flat butt inasmuch as it aids
in forming a symmetrical prong securing head 58
without excessive heat when the prongs are se
cured by means of resistance welding. When up
.30 setting the concaved butt 51 into a prong securing
head 58 as in a riveting operation, it has been
found that the use of a concaved butt 51 mate
in relation to the angle back and at the same
time remove the shoulders at the base of the
prongs from interference with the punched filler
sheets. The locking device is of a novel character
which minimizes racking and distortion when
opening and closing the binder, the minimizing
of distortion of the parts of the binder being es
sential to long life and maintenance >of the op
posed leaf-impaling prongs in operating relation
ship to each other for accuratelyv guiding and en 10
gaging filler sheets.
Although but one embodiment of this invention
and one particular application of this method has
been shown and described, it'will be understood
that numerous variations of the method may be 15
had, and that numerous changes including `the
size, shape, arrangement and details of the vari
ous parts hereof may be made without departing
from the spirit of my invention, and it is not in
tended to limit the scope thereof other than by 20
the terms of the appended claim.
I claim:
In a hinged angle back loose leaf binder having
impaling prongs adapted to engage punched filler
sheets when the binder is partially or fully closed, 25
the combination of end pieces on the angle back
in pairs cooperating to form end closures, a lock
ing lever pivotally mounted on one end piece lat
erally spaced therefrom and having a portion
thereof straddling said end piece of one end clos 30.
ure, a detent on the other end piece of said end
closure, a spring around said pivotal mounting
between the lever and the end piece to which it is
' The preferred method of manufacture of pivoted constantly urging said locking lever'into
registry >with said detent also adapted to maintain
35 prongs and assembly into hinged angle back the said locking lever in suñlcient spaced relation
metals disclosed herein and the two adjustments
of the position of prongs after assembly provides to the end piece on which it is mounted to permit
the other end piece to rotate therebetween when
¿an improved method of inexpensive quantity pro
the binder is being opened and closed, and an
duction of split prong loose leaf binders with op
rially aids in providing tightly secured prongs.
40 posed leaf engaging prongs in accurate relation
to each other.
The frusto-conical shaped depressions provide
an essential function of adjustability of prongs
operating key adjacent said straddling portion of
said locking lever therefor for manually releasing
said locking device.
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