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Патент USA US3086701

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April 23, 1963
F. E. FOBIANO
3,086,691
EMBOSSED LOCKING TABS FOR CARDBOARD CARTONS
Filed Nov. - 13, 1961
2 Sheets-Sheet 1
ll
1 ,525 ,6
INVENTOR.
WA‘ m j
BY
"
M m//m
'
11772127523’
April 23, 1963
F. E. FOBIANO
3,086,691
EMBOSSED LOCKING TABS FOR CARDBOARD CARTONS
Filed Nov. 15, 1961
2 Sheets-Sheet 2
Q25
INVENTOR.
BY
M
B?bh?hl
Patented Apr. 23, 1963
2
3,086,691
EMBOSSED LOCKING TABS FQR CARDBOARD
CARTQNS
Frank E. Fobiano, Cincinnati, {)hio, assignor to Premier
Qarton Company, Cincinnati, Ohio, a corporation of
Ohio
Filed Nov. 13, 1961, Ser. No. 151,632
3 Claims. (Cl. 229-35)
This invention relates to cardboard cartons and more
particularly the invention relates to cardboard cartons
having locking corner tabs by which the corners between
'It has been a further objective of the invention to form
a three-dimensional locking tab by forming an emboss
ment on the tab, which embossment in passing into a co
operative relationship with the adjoining panel snaps in
the tab’s locking surface into proper engagement with the
locking surface of the adjoining panel.
These and other objectives of the invention will become
more readily apparent from the following detailed de
scription taken in conjunction with the accompanying
drawings in which:
FIG. 1 is a perspective view of a carton employing the
present invention,
FIG. 2 is a plan view of the one piece blank from which
Cartons of the type to which the present invention is
the carton is formed,
directed are formed by the manufacturer as one piece 15
FIGS. 3, 4 and 5 are fragmentary side elevational
blanks and shipped as stacks of ?at blanks to the packager.
views showing the steps of carton formation,
The packager, either manually or through the use of auto
FIG. 6 is a plan view taken along lines 6-6 of FIG. 5,
and
matic machinery, sets the cartons up and ?lls them with
the merchandise which is ultimately to be sold to the
FIG. 7 is a cross sectional view taken along lines 7--7
consumer.
20 of FIG. 5.
The manufacturer must give attention to the problems
In the illustrated form of the invention a carton indi
cated at 10 is shown as being a simple tray or boat struc
of the two different stages in which the carton is proc
essed, namely, the stage of manufacturing the one piece
ture. It should be understood that the invention is appli
‘blank and the later stage of setting up the one piece
cable to other types of cartons wherein corner joints are
blank into the form of a box. At the manufacturer, the 25 formed between adjoining panels.
one piece blank must be formable in existing machinery
The principal elements of the carton are the bottom
panel 11, the side panels 12 and the end panels 13.
in order to be economically feasible. Thereafter the
packager must be able to form a box from the one piece
Each end panel is formed with a locking tab 14 at each
blank as conveniently and economic-ally as possible. Ob
end thereof, each of the locking tabs having a projecting
viously a carton design which effects economy in the op
tongue 15, one edge 16 of which being normally inclined
eration of the packager is an attractive product and high
to the plane of the bottom panel and providing a locking
surface.
ly salable to the packager. The present invention is di
rected principally to the problems of the packager and it
The side panels 12, at each end thereof are formed
has been an objective of the invention to facilitate the
with angulated slits 17, the slits providing an edge 18,
formation of cartons from the blanks ‘received from the 35 normally inclined to the plane of the bottom panel which
manufacturer.
forms a locking surface to cooperate with the locking
surface 16.
In the formation of a generally rectangular cardboard
carton having a bottom panel, two side panels and two end
In the forming dies, a one piece blank shown in FIG.
panels, the end panels must be joined to the side panels
2 is cut, slitted as at 17 and creased to provide fold lines
in order to form a reasonably secure corner which will 40 19 for the side panels, fold lines 20 for the end panels
and fold lines 21 for the locking tabs 14. Diagonal re
maintain the merchandise within the carton. The carton
inforcing ribs 23 may also be formed.
may have a covering panel, dividers and other extrane
ous features as required for the particular merchandise
Simultaneously with the cutting and scoring to form
to be packaged. The corner lock of the present inven
the blank, the tongues 15 are embossed to form indenta
tion is adapted for use with all such different types of 45 tions 25. The indentations take the form of protuber
cartons, the only consideration being that corner joints
ances on the outside surfaces of the tongues 15, the pro
must be formed between adjoining end panels and side
tuberances projecting beyond the plane of the locking
panels.
tab a distance equal to approximately one-fourth of the
In the formation of a corner joint, two fundamentally
thickness of the cardboard from which the blank is
formed.
different approaches may be taken. In one approach,
tabs formed either on the side panels or end panels may
The manner in which the locking tabs with their
e joined by gluing to the adjoining panel thus forming
tongues 15 are introduced into the slits 17 in the side
a corner. The disadvantages of gluing should be fairly
panels is illustrated in FIGS. 3, 4 and 5. The tabs 14 as
obvious. The other approach is to con?gurate a tab so
well as the side panels 12 are ?rst bent at right angles to
that it can cooperate with the adjoining panel in such a 55 the plane of the one piece blank. Thereafter the end
manner as to lock the adjoining panels together. While
panels 13 are folded upwardly through a right angle to
such locking tabs have been successful, they do require a
form the corners. As the end panels are folded upward
certain amount of manipulation, either manually or by
ly, the slit 17 is opened slightly by forcing the V-shaped
carton side panels are formed.
automatic machinery in order to bring the cooperating
portion 26, formed by the slit, away from the plane of
locking surfaces into proper relationship or orientation
the side panel.
tance to permit
The forward
17 is V-shaped
with respect to each other so that a locking engagement
is attained.
It has been an objective of the present invention to
The slit is opened only a su?icient dis
the tongue 15 to pass through the slit.
edge of tongue 15 which ?rst enters slit
to facilitate its introduction into the slit.
minimize the manipulation required of the cooperating
As the tongue passes through the slit from the position
of FIG. 3 to the position of FIG. 4, the protuberance
corners of a carton.
25 bears against the inside surface of the side panel 12
It has been another objective of the invention to pro
and thereby forces the locking edge surface 16 away from
vide a tab lock con?guration in which the locking sur
the plane of the inside surface of side panel 12. In be
faces snap into the proper orientation as the panels to
ing forced away, the locking surface 16 is moved into
which the tabs are mounted are brought into proper up 70 registry with the locking surface 18 formed by the slit
locking surfaces in order to effect the locking at the
right position.
17. Thus as the end panel swings in a counterclockwise
3,086,691
\
direction, as viewed in FIGS. 3, 4 and 5, the locking sur
face 16 moves into engagement with the locking surface
18 and prevents the inadvertent withdrawal of the tongue
15 from the slit 17.
FIGS. 6 and 7 illustrate the manner in which the lock
ing surface 16 is forced outwardly by the protuberance 25
to underly the surface 18 of slit 17.
While a speci?c embodiment of the invention has been
described with reference to FIGS. 1 to 7, it should be
borne in mind that departures may be made from the
4
to provide an indented middle portion and a lock surface
at the edge thereof, the two other opposite side panel
sections having angulated slits adjacent the ends thereof,
the locking tabs of said ?rst two side panels being folded
around the ends of said two other opposite side panels
and the locking tongues being inserted through said an
gulated slits whereby the indented middle portion of said
tongues engages an inside wall of the said other side panels
and spaces said lock surface away from the surface of
said other side panels whereby the lock surface is en
gageable with an edge of the slit.
preferred embodiment without departing from the scope
3. A rectangular carton constructed from a one piece
and spirit of the invention which, in essence, resides in
blank comprising a bottom panel, each edge of said bot
the embossing of locking tabs to provide assurance that
tom panel having upstanding therefrom a side panel, two
the locking tabs will move into locking engagement with
the surfaces with which they cooperate.
15 of said side panels being located On- opposite sides of said
I claim:
1. 'In a rectangular carton constructed from a one piece
blank comprising a bottom panel, each edge of said bot
tom panel having upstanding therefrom a side panel, a
carton and having locking tabs at each end thereof ex
tending laterally outwardly therefrom, each of said lock
ing tabs having a locking tongue extending outwardly
therefrom, each of said locking tongues being embossed
corner construction between adjoining side panels com 20 to provide an indented middle portion and having an edge
prising a locking tab at the end of a ?rst side panel, said
inclined to the plane of said bottom panel to‘ form a
side panel having a locking tongue extending outwardly
therefrom, said locking tongue being embossed to provide
an indented middle portion and having an upper edge
lock. surface, the two other opposite side panel sections
having angulated slits adjacent the ends thereof, each slit
being formed at least in part by an edge generally paral
forming a locking surface, the adjoining side panel having 25 lel to said lock surface, the locking tabs of said ?rst two
a slit adjacent the end thereof, the locking tab of said ?rst
side panels being folded around the ends of said two
side panel being folded around the end of said adjoin
other opposite side panels and the locking tongues being
ing side panel and the locking tongue being inserted
inserted through said angulated slits whereby the indented
through said slit whereby the indented middle portion of
said tongue engages an inside surface of the said adjoin 30 middle portion of said tongues engages an inside wall of
the said other panels and spaces said lock surface away
ing side panel and spaces said locking surface away from
from said surface of said other side panels whereby the
said surface of said adjoining side panel whereby said
lock surface is engageable with an edge of the slit.
locking surface is engageable with an edge of ‘the slit.
2. A rectangular carton constructed from a one piece
blank comprising a bottom panel, each edge of said bot 35
tom panel having upstanding therefrom a side panel, two
of said side panels being located on opposite sides of
said carton and having locking tabs at each end thereof
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,652,251
extending laterally outwardly therefrom, each of said
locking tabs having a locking tongue extending outward- 4O 1,796,035
2,901,158
1y therefrom, each of said locking tongues being embossed
Oliver et a1 ___________ __ Dec. 13, 1927
Maier ______________ __ Mar. 10, 1931
Carpino ____________ __ Aug. 25, 1959
t,.4_
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