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Патент USA US3029722

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April 17, 1962
3,029,712
M. B. DUNN
BOX ERECTING MACHINE
Filed June 9, 1959
3 Sheets-Sheet 1
_ \`_,
i5
/
L:is
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INVENTOR
MAURICE B. DUNN
ATTORNEYS
April 17, 1962
M. B. DUNN
3,029,712
Box ERECTING MACHINE
Filed June- 9, 1959
3 Sheets-Sheet 2
INVENTOR
MAURICE B. DUNN
BY
-
.
ATTORNEYS
April 17, 1962
M. B. DUNN
3,029,712
BOX ERECTING MACHINE
Filed June 9, 1959
3 Shee’cs-Sheet 3
fl.
INVENTOR
MAURICE B. DUNN
ATTORNEYS
g
States
'
IC@
3,@29312
Patented Apr. 17, 1962
2
l
3,029,712
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Since the present invention relates only to improvements
in the plunger and die assembly, the remaining elements
of the machine have not been shown in the drawings. It
will be understood that the present plunger and die as->
sembly is arranged to receive box blanks from any Suita
v
BOX ERECTING MACHIN y
Main-ice E. Dann, Charlotte, NtC., assigner to Memco
Machinery Corporation, Charlotte, N.C., a corporation
of North Carolina
ble box blank feeding means and to discharge the blanks
in box form onto a suitable receiving and conveying
Filed June 9, 1959, Ser. No. 319,101
12 Claims. (Cl. 93--51)
means.
This invention relates `to a machine for setting up
As best shown in FlGURES l and 5_7, the presentÁ
or erecting paper board cartons into condition foruse 10 plunger and die assembly is particularly adapted to set
in the packaging of commodities and more particularly
up’ñat box blanks of the type which includes a main
to improvements iu such machine for setting up into
bottom panel 10 having hingedly connected along score
box or tray form a cut and scored iiat box blank of
line at opposite sides thereof a pair of opposed side walls
12, each of which is formed with an angular cut 14
the corner‘lock type.
It is an object of the present invention to provide a
adjacent opposite ends thereof. Each cut 14 deñnes an
adjacent outer end portion 16 on the associated side
plunger and die assembly operable during movement of
the plunger through the die cavity to open the cuts in a
wall 12 and an adjacent inner end portion 18, the end
box blank of the type described and to insert and inter
portions 16 and 18 being dellectable relative to each
lock the tabs within the cuts at each corner of the blank
other to open the cut 1li.V
The boxrblank also includes a pair of opposed end
in a simple and efficient manner.
Another object of the present invention is the provisionV
walls 24) hingedly connected along suitable score lines to
of a plunger and die assembly of the type described hav
ing improved means for eñecting interlock between each
opposite ends of the main bottom panel 10. As shown
in dotted lines in FIGURE 1, the bottom panel is prefera
tab and cut of a box blank of the type described.
bly rectangular so that the end walls 20 extend in a direc
tion substantially perpendicular to the side walls 12.
A further object of the present invention is the pro
vision of a plunger and die assembly of the type de
Each end wall 20 has hingedly connected to each end
scribed having improved means for guiding successive
thereof along a suitable score line an end flap 22. Each
box blanks horizontally over the die into an operative
liap has its outer extremity cut to form a tab Z4 arranged’
position between the plunger and die wherein the bottom
to enter an associated cut 14, when opened, and to in
panel of the box blank is in transverse and horizontal 30 terlock with the associated outer end portion 16 to maiu
registry with the die cavity.
tain the associated corner of the box blank in erected
A still further object of the present invention is the
condition, that is, with the associated end-and side walls
provision of a plunger and die assembly of the type de
in upstanding position with respect to the bottom panel;
scribed having improved means for preventing buckling
10.
of the blank as a result of the leading edge thereof engag 35
The terms “end wall” and “side wall” as used herein`
ing the die during its movement into operative position
in describing certain portions of the structure of the box;
thereon.
blank and of the plunger and die assembly are not limitedV
Still another object of the present invention is the pro
dimensionally. That is, a side wall is a wall which is
vision of a plunger and die assembly of the type described
associated with the cuts in the blank rather than one 4which f
which is simple in construction and economical to manu: 40 is of a greater dimension than an end wall. Indeed, the
term “side wall” as used herein comprehends a Wall hav»
facture and maintain.
These and other objects of the present invention will
ing a dimension less than the walls perpendicular there
become more apparent during the course of the follow
to. Stated diñerently, the end walls are not necessarily
ing detailed description and appended claims.
the two shortest walls of the boxv blank, plunger or,die,->
The invention may best be understood with reference 45 and conversely the side walls are not necessarily the two-v
to the accompanying drawing wherein an illustrative em
longest walls of the four provided. The terms “en p”.
and “side” have been used merely as a matter of c_on
bodiment is shown.
In the drawings:
venience and if any significance is attached thereto it
FIGURE l is a fragmentary, horizontal, sectional view
relates to the fact that the side walls are the ones asso-`
illustrating the box erecting machine plunger and die
assembly embodying the principles of the present inven
tion;
ciated with cuts, whereas the end walls are the ones as
sociated with the locking tabs.
The plunger and die assembly of the present inven
tion is arranged to receive successive ‘blanks therebetween
,
FIGURE 2 is a side elevational view of the assembly
shown in FIGURE l;
and to set up such blanks into box form by relative verti
'Í `cal reciprocating movement between the plunger and die.
FIGURE 3 is an end view of the plunger;
FIGURE 4 is a longitudinal, vertical, sectional viewV
In normal operation, the assembly is embodied in a
machine provided with means for feeding successive
of the die; and
FIGURES 5, 6 and 7` are fragmentary, perspective
blanks thereto. To this end, there is shown in FIGURE
1 a portion of the arrangement for guiding successive
views, partially broken away forV purposes of clearer illus
tration, showing progressive steps during the operation
of the plunger and die assembly in eiîecting the interlock of the tab and cut at the corner of a box blank.
Box erecting machines capable of setting up into box
form a cut and scored flat box blank are well known in
the art. In general, such machines include a means for
receiving a stack of iiat box blanks, means for feeding
successive individual flat box blanks between a plunger
and die assembly which cooperate in response to relative
vertical reciprocating movement to eifect erection of
60
blanks horizontally into operative position between the
plunger and die assembly. As shown, this guiding ar
rangement includes a pair of transversely spaced guide
members 26 preferably in the form of angle irons.V
Preferably, each angle iron is disposed so that one of its
flanges is lhorizontal and the other flange is vertical and
extends upwardly from the iirst. In addition, the angle
irons are positioned so as to converge slightly toward the
plunger and die assembly so as to have a guiding effect
on the yblanks as they are moved therealong by means
70 not shown. The horizontal surface of the blanks are
the blank into box form, and means for receiving the
erected boxes and conveying them from the machine.
preferably supported by a pair of transversely spaced‘
3,629,712
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3
supporting plates 28, each secured to the horizontal flang
of the leading side wall 12 of the blank during its horizon
of an associated guide member 26.
tal movement into operative position over the die should
'
The die of the present plunger and die assembly com
prises va pair of elongated side wall members 30 and 32
curl under, it will be engaged by the inclined surface por
tions 72 and forced upwardly thereby over the upper
surface of the plates 68 and 40 until the leading side
preferably in the form of plates of vertically elongated
rectangular cross-sectional configuration. The side wall
wall 12 rests on the surface portions 70.
>members are mounted in spaced parallel relation by any
The inner surface ‘of the side wall member 30 and the
Vsuitable means, such as lower cross braces 34 extending
inner surfaces of the lplates 38 and 40 define the sides of
a cavity 74 of the die, the ends of which are formed by a
between >opposite ends of the side wall members adjacent
the lower surfaces thereof and upper» cross braces 36 ex
pair of end wall members 76. As best shown in -FIGURE
4, each _end wall member 76 has one end thereof extend
ing within a vertically elongated recess 78 formed in the
tending between the side wall members at positions spaced
inwardly
‘- The central
from'the
portion
lower
of the
crossside
braces
wall 34.
member 36 defines
-
side wall member 3i) and connected therewith by a pivot
a side wall engaging and folding means of the die.
pin 80 extending through ‘the side Wall member 30 and
Secured tothe central portion of the other side wall mem 15 the upper portion ofthe end wall member 76. The end
ber '32 to d‘eñne another side wall engaging and folding
plate 40 associated with each end Wall member 76 has its
means of the die is a central plate 38 and two end plates
lower outer corner cut out, as indicated at 82, to receive
40. The plates 38 and 40 are secured to 'the side wall 32
the opposite 'end of the associated end wall member 76
by any suitable means in positions so that each` end plate
40 is spaced from the 'associated lend of the central plate
as by a pivot pin 84 extending'thereth'rough and into the
38 to deiine'a channel or space 42 in one side face of the
upper portion of the associated end wall member in
and ythe latter is connected with the `side wall member 32,
alignment with the associated pivot pin 80.
l
It will be Vnoted that the inner edges of the recess 78
porting plates V28 are disposed above the upper surface of
and cut out 82 'engage the lower forward edge of the as
the side wall member 30, as shown in FÃGURE 2. ln 25 sociated end wall member 75 vso as to limit the inward
order to guide the blank into proper position over the
pivotal movement thereof. Each end wall member ’76
die
beneath the plunger, each upper cross brace 36
is resiliently biased for inward movement by any suita
has mounted 'thereon a guide member 44 in the form of
ble means, suc-h as a pair of spaced coil springs 88 suita
ail ‘angle iron having one flange disposed horizontally in
bly connected between the lower end ’of the associated
30
engagement with the upper surface of the associated cross
e'n'd wall member 76 and the associated lower cross
brace 34.`
brace 32 and 'secured therewith by any suitable means,
die.
'
Y
It will be noted that the uper surfaces of the blank sup
such as bolts ‘46 extending through transversely yelongated
the horizontal flange of the guide mem
bier. Each guide member :44 also includes a vertical
Carried by the side wall meinberlin) -a'dj'acent each
wardly 'adjacent the associated vertical iian'ge of the guide
member 424 to support thefassociated ’end wall of the
b'län'k ~as itis moved horizontally into operative position.
:In order to preyent the possibility of the blank buck
ling as 'a l‘result 'of the leading 'edge of the leading Yside
end of' they aperture 96 is reduced in cross-section to
prevent the movement of the ‘b_a'll 'beyond 'ía limiting -posi
tion wherein the 4Aperiphery extends into'the die'c'avity _74.
slots ’48 forlr'ned
corner ofthe cavity 74 is lan lou-ter end portion blank
engaging assembly 90 and a similar assembly 92 is car
flange extending upwardly from the horizontal flange and 35 ried ‘oy the 'opposite -side wall member 32 -at each associ
arranged to engage "an edge of the ñat blank as it is
ated corner of the cavity 74. Each lassembly 90 includes
a spring-pressed 'member inthe form of "a ball 94 mounted
moved horizontally into operative` position over the die.
Mounted 'on the outer -end of the vertical -ñange of each v within a vertically extending `aperture 96 'extending
through the side wall member 30. A b'ar`98 is secured
guide member '44.-l in "a position adjacent the side wall
member 132(r is Ava stop block 50 which is arranged to en 40 to the outer surface _of the side wall member 30 adjacent
the aperture 96 and lhas an aligned aperture 100 formed
g'a'ge the 'end -iiap of the blank'outwardly of the 'associated
therein. A 'coil spring X02 is mounted 'within the aper
tab 24. lThe guide members '44 thus Íserve lto position
ture 100 >and :has one 'end thereof disposed in engage
each blank >in proper relation to the die in one direction
ment with a plate 104 secured to the ‘bar '98 iand its
while the stop blocks 50 serve to properly `position -the
blank -~in `the other direction. A supporting plate 52 is 45 otherl‘e'nd ïdís’posed 'in engagement with the ball to re
siliently urge the latter 'toward the cavity. The inner
Secured to lthe upper surface of each cross brace 36 in
Each assembly 92 includes a ball 106'r'nount'ed within
an aperture 108,»similar to aperture 96, extending through
the Vassoci-ated end of jplate 230.- The side wall 32 has
wall l12 of the blank engaging the plates 38 vand 40 of
an >alig’ned aperture 118 'formed therein ‘for receiving
a ‘coil spring 112 having 'one‘end ‘engaging the ball 186
and its other end engaging a plate 114 suitably secured
to the `outer surface of the èside ïwall ‘member 432, as by
th'e'die Éduring the movement of 'the blank into operative
position, there is provided a pair'of pivoted ñngerassem
blies, vgenerally indicatedfat 54. Each pivoted finger as
sembly includes a block 56 secure'dtto the 'outer surface
of îthe side wall 32, as by bolts ‘58. The upper surface
bolts 116.
The ball m6 Ais resiliently biased by the
aligned recess -62 is formed in the upper surface of the
side wall member 32.
ly vcomprises 'a body, fgenerally’ indicated at 118, ywhich
is> preferably in 4rthe form ’of-’a casting. vThe body M8
includes "a central, horizontally disclosed portion 12()
of eachV block 56 is provided with va rectangular recess 6i) ’ K spring 112 into 'fa limiting position ‘in a manner similar
which is valigned with'the space 42 Ibetween the central 60 tofthe ball 94.
The plunger of the present plunger and ’die assem
plate /38 and associated end plate 40. In addition, an
Pivotally mounted 'within the recess 60, as by pivot
pin’64,i`is ïaìblock 66 having >a finger or guide member 68
mounted in its upper surface. Each ñnger v68 is provided
with 'an upper surface having a‘rearward portion 70 which
is normally disposed in a horizontal position l'and a for
wfard` portion 72 disposed at van angle of lappr'Cutimately
65
havingr'e‘nd Vwalls ‘122 extending downwardly and out
wardly therefroinjat an inclination of approximately 5°.
Parallel 'side lwalls 124 land :126 extend downwardly
from opposite> sides thereof, the "side vwall `1‘26 'having a
portion extending'upwardly above the _centralhorizontal
SCÍ with respect toàthe rearward portion. The weight of 70 portion 1120. i Formed in yeach side wall 124 and 126 is
each block 66and ñnger 68 is distributed relative to the
associated pivot pin 64 so as to bias or maintain thesnr
face portion 70‘in its horizontal position and the surface
portion 72 inv a position extending downwardly in front
a pair of vertically extendingslots or recesses 128, each
slot being spaced -from the >associated end wall a dis
tance slightly greater than the corresponding distance
ofthe cut i4 from 1the associated end ofthe side flap.
ofthecasèóc‘iated -plate'ses and 4o. lrfthe^1eaaing edge 475 Thepurpbse‘of each recess‘is to permit ‘ready'entry of
3,029,715?
the associated tab during the interlocking of the tab and
6
ment of the surface 142 of the plunger body with the
bottom panel of the blank, the linger assemblies 54 will
cut.
The portion of each Vside wall extending from each
be pivoted in a counter-clockwise direction as viewed in
FIGURE 5. At the same time the side walls 12 and end
recess 128 to the associated end of the body is re
lieved as indicated at 130. As shown in FIGURES l and
` 5-7, the relief 130 is preferably along a plane which
extends in a horizontal direction inwardly yfrom the ad
flaps 22 of the blank begin their upward folding move
ment.
Subsequently, the end walls 20 engage the upper end
of »the end wall members 76 of the die and begin their
jacent plunger end at an angle’ of approximately 71/2°
upward folding movement. As the plunger progresses
and which extends vertically inwardly and upwardly an
angle of approximately 71/2“, Prefer-ably, a slight ver 10 downwardly into the die cavity ’74, the spring pressed
balls 94 and 106 will engage the outer end portions of
tical marginal edge is provided, as indicated at 132.
the side walls 12 of the blank, the latter being moved
(Associated with each slot 12S is a plate 134 rigidly
progressively downwardly past the balls so that the outer
secured, as by bolts 136, to each side wall adjacent
end portions are deflected inwardly against the relieved
to and inwardly of each slot. The upper outer end
portions 130 of the plunger.V The inner end portions of
of each plate 134 has an inclined blank receiving knife
the side walls of the blank are maintained in the plane
of the side walls 124 and 126 of the plunger by engage
ment of the cut opening plates 134 therewith, as is clearly
illustrated in FIGURE 5. This operation has the effect
of opening the cuts 14 by relative deflection of the inner
end portions 1S withv respect to the outer cud portions
16 adjacent the cut.
Further downward movement of the plunger results in
common horizontal plane, as indicated at 142, for the
the further folding of the end walls into their upright po
purpose of engaging the bottom panel of the blank. It
will be understood that the peripheral dimensions of the 25 sitions which alsoreffects a comparable movement of the
associated end flaps past the associated spring pressed
surface 142 are slightly less than the corresponding di~
balls so that the tabs 24 will move within the opened cut,
mansions of the die cavity 74.
as shown in FIGURE 6, It will be noted that the outer
edge 138 formed thereon and disposed at an angle of
approximately 45° with respect -to the horizontal. Each
plate also includes a vertical outer edge 140 spaced in
wardly from the adjacent outer slot wall to define a space
for receiving the associated blank tab.
The end walls 122 and side walls 124 and 126 of the
kdie body 11S have their lower surfaces disposed in a
Operation
As noted above, the plunger and die assembly de- '
scribed above is arranged to be embodied in a machine
` having means for feeding successive dat box blanks there
to and means for receiving the set-up box blanks and
conveying the same away from the machine. Preferably,
edge' of each tab is guided past the associated plate edge
140 by the associated inclined knife edge 138 and is al
lowed to enter the recess 12S during its movement through
the cut. Of course, the end wall members 76 pivot into
vertical alignment against the action of the springs 88
as the die passes therethrough.
As the folding move
the feeding means is arranged so as to move successive 35 ment of the end walls 219 of the blank into an upright
blanks horizontally into an operative position over the die
cavity 74. To this end, the plates 28 serve to suppont
the blanks for horizontal movement into such position
while the vertical flanges of 4the guide members 26 serve
to insure that the blank will move into proper operative
position between the ilanges of the die guide members 44.
As noted above, the linger assemblies 54 are mounted so
that they normally assume a position wherein the surface
portions 70 are disposed horizontally and the surface por
tions 72 extend downwardly in front of the plates 38
and 40 Kat an angle of approximately 30°. Thus, as the
blank is moved horizontally over the die cavity the lead
ing edge of the leading side panel 12 may engage the
inclined surface portions 72 and be forced upwardly onto
the horizontal surfaces 70. This action insures that the
leading edge will not engage the plates 3S and 40 so
that the blank will buckle during its movement into
operative position. The horizontal movement of the blank
is limited by engagement of stop blocks 50 therewith. In
operative position, the blank is disposed as clearly indi
cated in dotted lines in FIGURE 1, with the main bot
tom panel 10 of the blank in transverse and longitudin-al
registry with the die cavity 74, and the end walls 20
of the blank resting on the plates 52.
It will be understood that when the present plunger
and die assembly is embodied in an operative machine,
means will be provided for effecting a relative vertical
' reoiprocation between the plunger and die.
Preferably,
position is completed the tabs 24 will have moved com
pletely through the cuts and into slots 128 and thus be
come interlocked with the side wall end portions. Atlthe
same time the spring pressed balls will have passed above
40 the upper edges of the ñaps and side wall end portions as
is clearly illustrated in FIGURE 7.
The downward movement of the plunger continues
until the upper edge of the set-up box passes beneath
the lower edge of the die cavity defining members. In
45 this regard, it will be noted that the inherent resiliency
of the paper board material of the blank will cause the
end and side walls to bow out as they pass under the
die cavity defining structure. Thus, when the plunger
begins its upward travel the upper edges of the set-up
50 box will engage the lower surface of the cavity defining
members and be stripped from the plunger, the spring
urged pivotal mounting of the end wall member aiding
in this action. As previously noted the stripped, set-up
box blank is arranged to be received by means embodied
55 in the machine for conveying the same away.
It thus will be seen that the objects of this invention
have been fully and effectively accomplished.` It will be
realized, however, that the foregoing specific embodi
ment has been shown and described only for the purpose
60 of illustrating the principles of this invention and is sub
ject to extensive change without departure from such
principles. Therefore, this invention includes all modi
fìcations encompassed within the spirit and scope of the
following claims.
the side wall members 30 and 32 are rigidly secured
to the frame of the machine while the plunger is suitably 65 I claim:
1. In a machine for at least partially setting up into
carried by a cross head mounted for ver-tical reciproca
tion on the frame of the machine.
In this way, the
box form a cut and scored iiat box blank having a bot
tom panel, a pair of opposed side walls hinged to said
bottom panel, each having a tab receiving cut formed
Referring now more particularly to FIGURE 2, it will 70 therein at positions spaced inwardly from each end there
of to define inner and outer end portions deñectable with
be noted that the plunger is disposed in a raised position
respect to each other toV open said cut, and a pair of
above the die as the blank is moved into operative posi
tion over the die. The blank is set up during the subse
end walls hinged to said bottom panel each having an
quent vertical movement of Ithe plunger through the die
end flap hinged to opposite ends thereof, each flap having
cavity. It will be noted that during the initial engage 75 a locking tab insertable into an associated tab receiving
plunger is mounted for vertical reciprocation through the
cavltyrof the die.
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cut to lock said walls in upstanding relation with respect
to said bottom panel, the combination ccmprislng a dre
line lying in the vertical plane of the’associate side wall,
guiding means includes spaced guiding members carried
by said die for engaging the edges of the blank parallel
the cavity thereof to at least partially set up a box blank
the second lineat its lower end being disposed 1n said
having box blank wall engaging means defining a cav1ty
associated vertical plane and extending inwardly and up
of a size generally conforming to the size of said bottom`
wardly, each plunger recess having a box blank inner end
panel, anda cooperating plunger movable relative to said
portion engaging plate extending from the opposite s_ide
die through the cavity thereof to set up a box blank
thereof over the same and terminating in spaced relation
moved horizontally into an operative position therebe
to the second line forming side of said recess, and means
carried by Vsaid die cooperating with each of said plunger
tween, means for guiding successive flat box blanks intoY
said operative position to insure that the bottom panel
surfaces for interlocking the associated locking tab and
thereof is in transverse and longitudinal registry with said 10 cutv during the relative movement between said plunger
die cavity, said guiding means including a n_nger having
and die.
l
a guiding surface portion extending inwardly into said
8. In a machine for at least partially setting up into
cavity below the adjacent upper surface of said die and
box form a cnt and scored ñat box blank having a bot
a supporting surface portion disposed outwardly of said
tom panel, a pair of> opposed side walls hinged to said
cavity above theadjacent upper surface of said die, said 15 bottom panel, each having at least one tab receiving cut
guiding surface portion being positioned to engage the
formed therein at a position spaced inwardly from the
leading edge of a box blank during its movement hori
end thereof to define inner and outer end portions de
zontally over said die toward said operative position and
fiectable with respect to each other to open said cut, and
to guide such edge over the adjacent upper sur-face of
a pair of end walls hinged to said bottom panel, each
said` die on to said supporting surface portion, said nn 20 having at least one end flap hinged to the end thereof
ger being pivotally mounted on said die for movement
adjacent said one side wall, each flap having a locking tab
of said guiding surface portion out of said cavity in re
insertable into an associated tab receiving cut to lock
sponse to the movement of said plunger therethrough,
said walls in upstanding relation with respect to said bot
said plunger and die having cooperating means for inter
tom panel, the combination comprising a die having box
locking each locking tab and cut'during the movement 25 blank wall engaging means defining a cavity of a size gen
of said plunger through said die.
. erally conforming to the size of said bottom panel, and
2. The combination as defined in claim l wherein said
a cooperating plunger movable relative to said die through
positioned therebetween, said plunger having side walls at
to the direction of movement of the blank toward said 30 least one of which is disposed in a vertical plane, said one
operative position.
3. The combination as defined in claim l wherein said
finger surface portions are planar and disposed at an
angle of approximately thirty degrees with respect to each
other.
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4. The combination as defined in claim l wherein said
finger is biased to move into a position wherein said
guiding >surface portion extends into said cavity.
5. The combination as denned in claim 4 wherein the
weight of said finger is distributed on opposite sides of
its pivot to bias the same into said position.
'6. The combination as defined in claim l wherein the
box blank wall engaging means of said die provides re
cess means in one side of said cavity for receiving the
guiding surface portion of said finger when moved out Vof
said cavity.
t
7. In a machine for at least partially setting up into
side wall having a pair of vertically extending recesses
formed therein in communicating relation to the bottom
surface of said plunger in spaced relation from the ends
of said plunger a horizontal distance sufficient to permit
entry of the associated box blank tab therein during the
setting up of the latter, the suface of said one plunger
side wall extending from each end thereof to the asso~
ciated recess being defined by a first line forming the
associated plunger corner, and a spaced second kline form
ing the adjacent side of the >associated recess, each first
line lying in the vertical plane of said one side wall, each
second line at its lower end being disposed in the vertical
plane of said >one side wall and extending inwardly and
upwardly, each plunger recess having a box blank inner
45 end portion engaging plate extending from the opposite
side thereof over the same ‘and terminating -in spaced rela
Y tion to the second line forming side of the associated re
box form a cut and scored flat box blank having a bottom
cess, and means carried by said die cooperating with each
panel, a pair of opposed side walls hinged to said :bot
Vof said plunger surfaces for interlocking theassociated
tom panel, each having a tab receiving cut formed there 50 locking tab and cut during the relative movement between
said plunger and die.
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in at positions spaced inwardly from each end thereof
to define inner and outer end portions detlectable with
ì 9. The combination as defined ‘in claim 8 wherein said
respect to each other to open said cut, and a pairfofëend
plate includes an outer surface disposed in the vertical
walls hinged to said bottom panel each having an end flap
plane of the associated side wall and an inclined knife
hinged to opposite ends thereof, each flap having a lock
edge formed on the outer upper portion thereof.
ing tab insertable into an associated tab receiving cut to
10. The combination as defined in `claim 8 wherein
lock said walls in upstanding relation with respect to said
said 'die wall engaging means includes side wall .members
bottom panel, the combination comprising ya die having
disposed in vertical planes and spaced end wall ymembers
box blank wall engaging means defining a cavity of a
extending between said side wall members, and Vwherein
size generally conforming to the size of said `bottom panel, 60 said die interlocking means includes a horizontally ex
and a cooperating plunger movable relative to said Adie
tended ball receiving opening vformed in each of said
through the cavity thereof to at least partially set up a
side wall members in closely spaced relation lto at least
box blank positioned therebetween, said plunger having
one end wall member, a revolvable ball mounted in each
side walls disposed in parallel vertical planes, each side
wall having a vertically extending recess formed therein
in communicating relation 'to the bottom surface of said
opening for horizontal Vmovement therein, the inner end
of each opening being-shaped yto -prevent horizontal move
ment‘of the associated 'ball toward said cavity beyond a
plunger and in spaced relation ’from at least -one end of
limiting position wherein the periphery of the ball extends
said plunger a horizontal distance sufficient to permit
into said cavity, and spring means in each opening for
entry of the associated box blank tab therein during the
resiliently lbiasing the associated ball into said limiting
70
setting up of the ylatter, the surface of each plunger side
position.
wall Aextending from -said `one end thereof to the asso
ciated recess being defined -by a first line forming the
associated plunger corner and a'spaced second line form
'11. The 'combination as defined in >claim 10 wherein
eachside ’wall member `provides recess means forreceiv
ing the associated end of -said one end wall member.
ing the adjacent side of the associated recess, said ïfirst
l-2..'i`-he combination as defined in claim l1 wherein
3,029,712
10
said one end wall member is mounted between said side
wall members for pivotal movement about an axis eX
References Cited in the ñle of this patent
UNITED STATES PATENTS
tending through the upper portion thereof, the structure
defining the inner end of the associated side wall member
recess means serving to limit the inward pivotal move
2,483,063
2,741,957
2,832,270
Ray ________________ __ Sept. 27, 1949
Haas ' _______________ __ Apr. 17, 1956
ment of the lower portion of said one end wall member,
and spring means resiliently urging said one end wall
2,864,287
Pierce et al ___________ __ Apr. 29, 1958
Johnson et a1 _________ _.. Dec. 16, 1958
member into its limiting position.
2,919,633
Pierce _______________ .__ Jan. 5, 1960
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