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Патент USA US2128151

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Aug. 23, 1938.
Filed June 22, 1957
- I
145i Jiwie,
Patented Aug. 23, 1938
August iJ. Lurie, Chicago, Ill.
Application June‘ 22, 1937, Serial No. 149,685
(Cl. 30—2)
3 Claims.
My invention relates in general to cutting de
vices, and in particular to a simpli?ed carton
portion, to form a separated throat portion to
receive a cutting blade. Within the throat por
With the widespread use of paper cartons both
large and small in recent years, various devices
for opening the cartons have been devised so
as to accomplish the opening quickly and in a
manner so that the contents of the carton are
tion I provide an apertured recessed portion ex—
not injured. The prior art devices, however, for
10 opening cartons are complicated, in general, ex
pensive, and so constructed that the cutting or
knife portions thereof are not readily adjusted
for cartons having paper of different thicknesses
and hence do not open all cartons satisfac
l5; torily. Furthermore, because of this lack of
adaptability, some of the prior art devices may
cause injury to the contents of the carton when
using them on a carton for‘ which the device
was not particularly designed. With these dis
go't advantages, and because of a high selling price
for the devices as a result of the complexity of
the same, the distribution and use of the articles
has been considerably retarded.
It is an object of my invention to provide an
25, improved carton opener.
A further object is to provide a sturdy struc
ture capable of standing up under the Worst pos
sible abuse, and wear and readily adjustable by
any operator to adapt the opener to different
30, types of cartons and di?erent thicknesses of
cardboard or corrugated paper in the cartons.
It is also an object of my invention to provide
an extremely simple carton opener which can be
sold at a price so low as to make it attractive to
35‘. the housewife as well as the large user of paper
cartons, and thus obtain widespread use of the
Other objects and advantages of the invention
will be apparent from the following description
tending diagonally through one web and a cor
responding apertured projecting portion through
the other web to receive the cutting knife there
between and by means of a clamping unit ex
tending entirely through the apertures in the
webs, ?rmly but adjustably clamp the blade
Fig. 1 illustrates the complete carton opener
including the one piece substantially U-shaped
member ID, including a cylindrical or tubular
handle I I split at the one side and extending up
wardly therefrom in a pair of corresponding 15
webs or extensions l2 and I3 to form a clamping
throat or channel for the cutting knife. A.
guideway with guide portions l4 and I5 is pro
vided on top of the clamping extensions and
integral therewith. The body portion I0 is 20
stamped from sheet metal which has substan
tial rigidity yet suf?cient resiliency so that the
two- clamping extensions I2 and I3 are under
tension as a result of the tubular handle con
struction, and when the clamping pressure is 2.)
removed from these portions they spring apart
in the usual manner to permit movement of the
cutting knife.
The cutting operation on a paper carton is
accomplished with a knife blade ll clamped be- 110
tween the extensions l2 and I3 at an inclined or
diagonally extending formed‘recess l8 in the wall
The recess I8 is preferably of a width cor
responding approximately to the width of the
knife blade ll. A correspondingly inclined pro- 35
jecting portion I9 is formed in the opposite wall
or extension so as to bear against the blade I1
and seat in the recess. as shown particularly in
Fig. 3.
The blade I‘! is adjustably retained in the 4.0
.101 taken from the drawing in which:
Fig. 1 is a perspective view of the complete clamping portion by means of a clamping as
sembly comprising a bolt 2| having a square
carton opener of my invention;
Fig. 2 is a side elevation of the carton opener shank portion 22 of such a length as to extend
from the side appearing as the upper side in the completely through an elongated aperture 23 in
451 position illustrated in Fig. 1;
the recess l8 inclined to correspond with such
Fig. 3 is a fragmentary sectional view along recess, and through a corresponding aperture 24
the line 3—-3 of Fig. 2; and
in the projecting portion [9. The threaded por
Fig. 4 is a fragmentary sectional view along tion of the bolt carries a thumb screw 26 in the
the line 4—4 of Fig. 2.
usual manner. A washer 21 is carried inter- .
In practicing my invention I provide a stamped
out one-piece metal member having a guideway mediate the bolt head and the portion M3 for its ‘‘
usual bearing function and also to act as a sup
at the upper portion thereof, a substantially tubu
lar hand grip portion at the bottom thereof, and
webs or extensions from the hand grip portion,
55 and intermediate the guideway at the upper
port for the recess.
A.pair of ordinary washers '
28 and 29, with the former having a larger aper
ture than the latter as shown in Fig. 3 so» as to 55
progressively ?t over the portions of the bolt
invention in its preferred embodiment, it is
shank, are carried under the thumb screw 26.
understood that the invention is not limited
With the square shank portion 22 extending
completely through the two rectangular apertures
23 and 24 and similarly through a square aper
ture 3| in the blade, the bolt 2] is prevented from
turning, and the blade H is prevented from turn
ing on the bolt itself. Furthermore, the aper
ture Si is provided off center transversely of
the blade and nearest the cutting edge, so that
the maximum clamping pressure, which pressure
is of course between the thumb screw and bolt
thereby, but is limited only by the scope of the
appended claims.
I claim:
1. A carton opener including a pair of adja
cent but separated corresponding walls, each hav
ing a carton engaging ?ange at one edge there
of, an apertured cutting blade adjustably carried
intermediate said walls for movement to vary 10
the cutting length of the blade beyond said
?anges, each wall having a correspondingly posi
head, is applied as near the cutting edge as possi
tioned slot therein and with at least one of said
ble where the greatest strain is exerted on the slots being rectangular in shape, a shanked
clamping bolt extending through the slots in said 15
15 blade in the cutting operation. Of course, the
recessed and projecting portions I8 and 19 also
cooperate to prevent the blade I‘! from rotating
in the clamping channel or throat, and with the
blade bearing at its rear edge against the wall
20 32 of the recess IS, a very rigid mounting for
such blade is accomplished.
Before using the carton opener, the thumb
screw 36 may be loosened until the bolt 2| carry
ing the blade will slide readily in the rectangular
25 slots 23 and 24. It is possible to hold the han
dle portion in one hand and, operating the thumb
screw and bolt in the other hand, move the blade
to any desired adjustment, and carefully measure
the projecting portion of the blade with one’s eye
during the adjusting movement.
Tightening the
the slot to move said blade therewith.
2. A carton opener including a handle portion,
a pair of adjacent clamping walls extending
therefrom having a cutting-blade seat de?ned
by corresponding reshaped portions in said pair
of walls, with said seat extending diagonally in
said walls, a guide ?ange extending laterally
from each wall at a side edge opposite to the
clamping extensions !2 and [3 together to clamp
handle portion, a cutting blade carried between
said walls at said seat with each of said clamping
walls having a rectangular aperture therein at
the clamping seat portion thereof extending at 35
an angle with the guide ?anges corresponding to
the angle of the seat portion therewith, and with
said cutting blade having a square aperture sub
stantially centrally thereof, and a clamping bolt
extending through said apertures having a square 40
shank portion thereon to prevent rotation of the
bolt in the rectangular apertures of the seat por
tions but permit movement over the length of said
apertures, and ?tting in said square aperture of
the cutting blade and acting to prevent rotation
a carton. A very satisfactory width for this has
been found to be 322‘ of an inch. With the verti
cal ?ange I5, that is vertical as illustrated in
40 Figs. 1 and 2, lying on the top of a carton, the
cutting edge C of the blade I‘! is pressed into the
side wall of the carton, and then with the guide
?ange l4 bearing against the outside wall of the
carton, the opener is pulled along with the blade
cutting the side Wall as can be readily under
stood. With the ?nite adjustment possible on
the cutting blade there will be no danger that
the blade will extend into the carton far enough
to injure the contents, and with only the thumb
screw 26 to operate to be sure that the blade is
50 rigidly retained in the clamping portion of the
device, there is no danger of a complex multitude
of parts becoming loose or out of position so as
to in any way interfere with the cutting opera
tion. The guide ?ange M has sharp scraping
55 edges at the outer edges thereof to scrape off
blade cutting and blade adjusting positions, and 20
Wtih such bolt shank shape acting to prevent
rotation of the bolt in said rectangular slot but
permitting movement of the bolt lengthwise in
thumb screw 26 on to the bolt 2| pulls the two
and retain the blade in the desired position. The
horizontal ?ange 33 intermediate the blade I‘!
35 and the vertical guide ?ange I5 is of a width to
correspond, on an average, to the paper top of
Walls and through the aperture in said blade,
with the shank of said bolt and the aperture in
said blade each of such shape as to cause one to
be non-rotatable with respect to the other in
of the blade on the shank.
3. A carton opener including in combination a
one-piece handle and blade carrying member
having guide ?anges for engagement with a car
ton surface, with the blade carrying portion of
said member comprising two adjacent corre 50
sponding walls having a reshaped seat portion
in said walls disposed diagonally with said guide
?anges, an apertured cutting blade carried in
said seat portion, a shanked clamping bolt in said
aperture with the aperture and shank of said bolt 55
labels or the like if desired, after completing
each of such shape as to prevent rotation one
the cutting operation. The fact that practically
the entire device is furnished in stamped out
with respect to the other, said seat portion in said
metal members, and the fact that there are rela
tively so few parts, makes it possible to produce
the device very cheaply to permit a low selling
price, and thus provide large potential distri
Although I have illustrated and described my
Walls having a slot lengthwise thereof for re
ceiving the shank of the bolt and being of such
shape as to prevent rotation of the bolt therein 60
when the blade carrying portion of said member
is in clamped operating position.
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