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Jan. 8, 1963
R. o. woELFER
3,071,910
END FLAP CLOSING MEANS FOR cARToNs
Filed Feb. l, 1961
2 Sheets-Sheet 1
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ATTORNEY
Jan. 8, 1963
3,071,910
R. o@ WOELFER
END FLAP CLOSING MEANS FOR cARToNs
Filed Feb. 1, 1961
2 Sheets-Sheet 2
F.
INVENTOR
ROBERT O. WOELF‘ER
ATTORNEY»
_
United States ~Patent dice
3,071,910
Patented 'Jr-1n. 8, 1963
2
1
FIG. 4 is a transverse section, on an enlarged scale,
3,071,910
-
END FLAI’ CLOSING MEANS FOR CARTÜNS
Robert O. Woelfer, 17 Roosevelt Blvd., Railway, NJ. ,
Filed Feb. 1, 1961, Ser. No. 86,366
10 Claims. (Cl. 53--376)
The invention relates to packaging, and is more par
ticularly directed to improvements in apparatus for clos
ing cartons.
`
‘
taken approximately in the plane of line 4-4 of FIG. 1;
FIG. 5 is a perspective View illustrating the manner
of operation of the closing end llap insertion means of
the invention, this view omitting the showing of the ad
jacent trough and the contained product for the purpose
of clarity in illustrationg‘and
FIG. 6 is a top plan view illustrating an end-closing
wedge which may be used in conjunction with the closing
The packaging of articles in cartons customarily in 10 end ilap insertion means of the invention.
Referring to FIG. 1 which shows the general organiza
volves setting up the cartons and conveying them past
tion of the v-arious means with which the closing end flap
suitable folding and tuck-in means to close the end or
insertion means of the invention is associated, the pack
ends of each carton after the ‘article to be packaged has
been inserted in the carton.
Where the carton has two
aging machine comprises conveyer means A which serves
ends to be closed, the article is usually inserted after 15 to continuously move the cartons B in the direction of
one end of the set-up carton is first closed.
Closing the ends of cartons with automatic machinery
requires the end panel of each carton to be turned up
from the ’botom toward the top panel and insertion of
the closing end flap, which is connected to the end- panel,
the 4arrow C past an end closing station D. Before reach
ing the end closing station, the cartons are moved con
tinuously past a loading station E, where an article F,
such as a pie or any oth-er product, is inserted by the
operator into each carton through an open end thereof.
As may be observed from FIG. 5, the top panel 10 of
each of the cartons B sags, because the carton stock is
not sufficiently stiff to maintain the panel in a straight or
level plane. Such lack .of stiffness may be due to the
lbeneath the top panel. Where the carton has a substantial
dimension or length in the direction in which it is con
veyed on the machine, the top panel has a tendency to
sag so that the top panel is closer to the bottom panel
midway of its length than where it is connected to the 25 .relatively large dimension between the carton’s side walls
or panels 12 and 14, or in the interest of reducing carton
side panels. Also, in order to minimize cost, the carton
cost, the carton stock may be thinner than adequate to
stock or board of which the carton is fabricated is kept
furnish the desired stiffness. For convenience of descrip
as thin as possible, thereby 'reducing the stiffness of the
tion, the side panel 12 will hereinafter be referred to as
carton’s walls or panels and further increasing the extent
of sag of the top panel. As a result, when the closing 30 the “leading side panel” and the side panel 14 as the
“trailing side panel,” such designations being related to
end flap is bent up for insertion under the top panel by
the positions of the side panels of a carton as it is con
veyed through the machine. Each carton also has a
the equipment of the prior art, the edge of the sagging top
panel blocks and prevents the insertion of the closing end
flap. The failure of the prior art equipment to properly
bottom panel 18. An end panel 16 is connected to the
bottom panel by a fold line, and is adapted to be turned
close the cartons as they are conveyed through the ma
up from the bottom panel to the top panel. As is also
chine has required manual effort to correct the inade
quacy of the machine, thereby increasing the cost of pack
common in the art, a closing end flap 20, which is con
nected to the end panel 16 by a fold line, is to be inserted
An object of the invention is to provide means for 40 or tucked in under the top panel 10. The end panel and
closing end flap on the other side of the carton are
automatically eliminating the sag in the top panel of a '
aging.
»
designated 16’ and 20', respectively.
In the immediate vicinity of the side panels 12 and 14,
and due to the support they provide for the top panel,
carton to thereby assure the proper insertion of the clos
ing end tlap.
‘
Another object of the invention is to provide means
automatically responsive to the movement of the carton
itself for eliminating the sag in the top panel to thereby
assure the insertion of the closing end panel, such means
further acting to guide the closing end panel for insertion
the top panel is at an elevation or level permitting the
vclosing end ñap 20 (or 20') to be tucked beneath the
top panel without diñiculty. However, intermediate or
midway between the side panels, and because of the sag
in the top panel as shown in FIG. 5, the exposed edge 21
of the top panel is at a level which is too low to permit
`beneath the top panel.
Still another object of the invention is to provide means
for Áautomatically inserting the closing end flaps of a
--continuously moving line of cartons in which the top
the end flap to be inserted beneath the panel’s edge by
the known automatic tuck-in or folding devices. In order
to assure that the end llaps of the moving cartons are in
serted beneath the top panels of a line of continuously
panels, for reasons of linear dimension or thinness of
carton stock or both, have a tendency to sag, this being
moving cartons, despite the sag in the top panels, top
`panel leveling means G, to be subsequently described in
accomplished without interruption of the continuously
moving cartons; land it is a further object of the inven
detail, is provided.
`tion to provide such means of a simple construction
In greater detail, and as shown in FIG. l, the conveyor
which is readily adaptable for association with existing
A includes a pair of parallel endless bands 22 and 22’
conventional carton closing equipment.
which are driven continuously over any suitable pulleys
These, and other objects and advantages of the inven 60 or sprockets and by any suitable drive means or motor
tion will be 4apparent from the following detailed descrip
(not shown) so that the upper horizontal runs, fragmen
tarily shown in FIG. l, move continuously in the direc
tion, taken in conjunction with the accompanying draw
ings, in which:
tion of arrow C. The conveyor means A also includes a
Y
number of pusher blocks 24 in the form of relatively short
FIG. l is a fragmentary and partly diagrammatic top
plan view of packaging apparatus provided at its end 6.5 angle members extending across and fixed to the bands
22 and 22’ in any suitable way. The pusher blocks are
closing station with the closing end flap insertion means
uniformly spaced along the conveyor bands, with the dis
of the invention;
.
FIG. 2 is a transverse section, on an enlarged scale,
taken approximately in the plane of line 2_2 of FIG. 1;
FIG. 3 is a transverse section, on an enlarged scale,
taken approximately in the plane of line 3-3 of FIG. 1;
.70
tance between blocks somewhat greater than the dimen
sion of each carton in their direction of movement, as
indicated in FIGS. 1 and 5.
The machine includes a pair of stationary, elongated,
horizontally extending plates located in a common plane
3,071,910
3
4
and forming the supports 26 and 28. The supports 26
and 28 are parallel and laterally spaced from each other,
slip an article F into each carton through such opposite
open end.
As each carton B moves beyond the loading station E
its end on support 28 is acted on by the anvil 38 and
prebreaker 32 as well as by flipper 48’ and its arm 56’
and the blocks 24 extend from the conveyor bands 22 and
22’ up through the space between these supports. Each
carton B bridges the space between the supports, and the
ends of the bottom panel 18 of each carton rest upon and
slide along the upper faces of the supports, shown in
FIGS. 2, 3 and 4. Thus, the pusher blocks slidably move
the cartons B continuously along the supports in the di
rection of arrow C.
10
In the example illustrated in the drawings, both ends
of each carton B are open as the cartons approach the
loading station E, and the machine operates in the same
way on both ends of the carton. It is to be understood,
in the same manner as described above in connection with
the end of the carton on support 26, so that the carton is
now in the same or symmetrical condition as shown in
FIG. 2. The arm 50’ turns in a clockwise direction, as
viewed in FIG. 1. Thus, the short inner flaps 44 and 46
also are folded in and slide along the inner surface of
the vertical wall of anvil 38, while the closing end ilap 2t)
is folded at the fold line between end panel and Hap at
the free edge of the horizontal wall of the anvil.
As shown in FIG. 1, the horizontal bottom walls of the
15
however, that the invention is equally applicable to car~
tons which have only one open end which must be closed
by the machine.
A pair of prebreakers 30 and 32 are ñxed to and eX
tend longitudinally along the supports 26 and 28, respec
tively. Each prebreaker is in the form of an elongated 20
anvils 36 and 38 terminate in laterally aligned ends 52
and 5‘2’. Beyond these ends the side walls of the anvils
are tapered (FIG. 3), and then terminate just ahead of the
end closing station D. At the ends 52 and 52' of the
anvils’ bottom walls, the prebreakers terminate and
channel fixed at one side to the upper face of the support
troughs 54 and 54' commence, the troughs forming ex
which carries it and has an inner concave face directed
tensions of the prebreakers. The troughs have a larger
toward the support, as shown in FIG. 2. The prebreakers
radius of curvature than the prebreakers and have upper
support a plurality of brackets 34, 34’ which are distrib
edge portions 56 and 56’ which are located quite close to
uted along the prebreakers, the brackets in turn respec 25 the top panels of the passing cartons. As shown in FIGS.
tively Supporting the anvils 36 and 38. The anvils are,
3 and 4, the undersides of these upper edge portions are
for part of their length, elongated angle members having
located in substantially the same plane or slightly above
the cross-section shown in FIG. 2 and they are located
the plane of the undersides of the top panels of the mov
to extend along and cooperate with the prebreakers. The
ying cartons when the top panels are level or flat. At the
brackets 34 support the anvils at an elevation so that their 30 end closing station D, the troughs S4 and 54’ are provided
undersides 35, 35’ are parallel to and spaced above the
with slots S8 and 58', respectively, extending horizontally
upper faces of the supports 26 and 28. The end panels
therethrough.
16 and 16’ of each carton B are contined for sliding be
Within the troughs 54 and 54’ and beneath the slots 58
tween the anvils and the supports. Thus, before the end
and 58', the supports 28 and 26, respectively, carry means
panels of each carton are turned up toward the top panel, 35 in the form of wedges 60 and 60' for turning the end
the anvils maintain the end panels on the supports in the
panels 16 and 16’ up to the top panel of each carton and
plane of the bottom panel 1S of each carton.
to insert the closing end ñaps 20 and 20' beneath the top
As shown in FIG. 1, the left free ends 40 and 42 of the
panel. The wedges 60 and 60’ are ñxed to and extend
vertical walls of the anvils 36 and 38, respectively are
longitudinally along the upper faces of the supports 28
curved away from the conveyor means A. Opposite ends 40 and 26, respectively. As shown in FIGS. 4 and 5, the
of the leading side panel 12 of each carton are provided
wedges each have inclined upper faces 62 and 62’ which
with short inner flaps 44 and 44', and the ends of the
rise upwardly from the surfaces of the supports 28 and 26
trailing side panel 14 of each carton are provided with
in the direction of movement of the cartons so that the
»short inner ñaps 46 and 46’. The anvil 36 and prebreaker
end panels 16 and 16’ of each carton ride up on the edges
30 extend to the left forward of the loading station E 45 and are turned in toward the top panel. The upper edge
so that before the cartons reach the loading station, the
portions 56 and 56’ of the troughs form parts of the
inner flap 44' of Veach carton is engaged by the curved
closing end ilap inturning means in that they direct the
Vend 40 of the anvil 36 and turned over the end panel 16’
closing end Ílaps 20 and 26’ to the underside of the top
into the opening between the top and bottom panels. The
panel 10 of each carton as the closing end flaps turn with
anvil 36 then maintains the flap 44’ folded perpendicularly 50 the end panels. As shown in FIG. 6, each wedge is in
lto the leadingside panel 12. Just forward of the anvil’s
wardly bent to provide an elongated free end which com
.curved end 40, the support 26 carries a ñipper 48 of a
pletes the end closing operation. The corresponding free
type .well known in the art. The rotary arm 50 of the
end 64’ of the wedge 60’ may be seen in FIG. 1.
flipper is driven in any convenient way so that it rotates
As shown in FIGS. l and 5, a pair of posts 66 and 66’
in a counterclockwise direction, as viewed in FIG. 1. 55 are ñxedly carried by the supports 28 and 26, respectively.
The arm 50 turns in the short inner ñap 46’ so that, like
Each post forms a support means for a pivotally mounted
the flap 44', it will be held by the anvil 36 in its inturned
blade of each means G for assuring the insertion of the
position as the carton is conveyed through the machine.
end ñap. The posts 66 and 66’ are located at the end
The rotation of the arm 50 and the movement of the car
`’tons are synchronized or timed so that the arm does not
engage inner ñaps 44', but does engage and turn in the
inner ñaps 46’. Moreover, the flipper arm engages an
upperpart of the short inner flap 46', and does not engage
closing station D outside of and adjacent the troughs 54
60 and 54', respectively, and carry at their upper ends pivot
pins 68 and 68’ which extend freely through respective
openings in blades 70 and 70’. The blades each extend
through the aforementioned slots 58 and 58', and are
angled to extend in the direction of movement of the
As shown in FIG. 2, as each carton moves beyond
65
cartons.
The blades are in the form of thin, flat plates;
the flipper 48 toward loading station E, its end panel 16’
they are supported by the posts to lie in a fixed horizontal
slides beneath the anvil 36, and the prebreaker 30 oper
plane and in a plane immediately below the undersides of
ates to turn the closing end ñap 20’ around the sharp
the top panels, when the top panels are flat. The blades
edge provided by the free edge of the horizontal wall of
are movable in their respective slots with respect to the
the anvil 36 along a fold line provided between the end
54 and 54'. The blades are located immediately
panel and closing end ñap. Each carton end sliding along 70 troughs
adjacent the undersides of the upper edge portions 56 and
the support 26 is in this condition as the carton is con~
56’ of the troughs.
veyed past loading station E. The opposite end of the car
The blades 70 and ‘70' are shown in FIG. 1 in their rest
ton sliding on the support 28 has not yet reached anvil
positions. They are resiliently urged to such position by
38 and associated prebreaker 32 so that the operator may 75 yieldable means, preferably in the form of the respective
the closing end flap 20’ of each carton.
3,071,910
6
5
coiled springs 72 and l72’. These springs are light in
with the insertion of the closing end flap beneath the
strength `and are respectively iixed to pins 74 and 74' car
ried by the blades and to pins 76 and 76’ carried by the
top panel.
troughs.-
top :and bottom panels, side panels, an end panel `adapted
The blades are mounted on their posts so that
2. In apparatus for closing an end `of a canton having
in their rest positions each blade’s free end 78 and 7‘8' is
located in the path of movement of the leading side panel
l2 of each carton.
As each carton B moves past the ,end closing station D,
its leading side panel 112 engages the blades’ free ends 78
and 78', turning the blades outwardly in opposition to the 10
«to `be turned up from said bottom to said top panel, and
wherein -a closing end flap is connected to the end panel
springs 72 and 72’. As soon as the leading side panel 12
continues to move past the station, and means at said
pushes the free end of each blade beyond its lateral edge,
station responsive to engagement by the carton for main
taining the portion of the top panel intermediate the side
panels at the elevation of the port-ions of 'the top panel
the spring for each blade returns the blade to its rest
position and Within the carton. Since the sagging top
panel ‘lill is supported by- and has its highest elevation im
mediately adjacent the side panels 12 and =14, the ends
718 and 7S’ of the blades move into the carton and beneath
for insertion beneath the Itop panel, means for continuous
ly moving the «carton past ‘an end closing station, means
at said s'tation for moving the end panel up to and the
closing end flap beneath the top panel while the carton
immediately adjacent the side panels, whereby the top
panel cannot sag to interfere with the insertion of the
closing end flap beneath the top panel.
3. In apparatus for closing an end of a carton having
a sagging top panel, means for continuously moving the
leading side panel 12. As each carton continues to move
past the blades, the blades, which are pivotally mounted to 20 carton pas-t .an end closing station, and blade means at
said station responsive to engagement by the carton for
swing in a ñxed horizontal plane, raise the sagging top
supporting ‘the top panel `at an elevation to eliminate the
panel to the level which the top panel has immediately
‘sag therefrom as the canton moves past said station.
adjacent the side panels 12 Iand 14. At the same time,
4. In apparatus for closing an end of :a carton having
the closing end ilaps are moved in under the blades by
a sagging top panel, la bott-om panel, side panels, an end
the Wedges »dil and dit', the blades acting to guide the
panel adapted to be turned up from said bottom ‘to >said
closing end flaps into the carton and under the top panel,
top panel, and wherein -a closing end flap is connected to
as shown in FIGS. 4 and 5. When the trailing side panel
the end panel for insertion beneath the top panel, means
14 of the continuously moving carton reaches the blades,
for continuously moving the carlton past an end closing
the blades. are swung outwardly by such supported panel,
and they then snap back into the space ahead of the next 30 station, means at said station for moving the end panel
the top panel immediately adjacent the inner surface of the
up to and the closing end flap beneath the top panel while
carton to be engaged by the leading side panel 12 thereof
to repeat the above operation. Thus, each blade 70 and
7 0’ responds automatically to the movement of the cartons
themselves to level out the sagging top panels to insure
that the closing end rilaps are properly inserted. Although
it is not essential, the short inner llaps `44, 44', 46, 46’ may
be cut away at their upper edges, as indicated for the flap
the carton for supporting the top panel at an elevation to
46 in lElG. 5.
As shown in FIG. l, and if desired, closing of the
rtop and bottom panels, side panels, an end panel adapted
to be turned up from the bottom -to the top panel, and
and 80’ which are supported for rotation by the bell
cranks 82 and 82'. The bell cranks are pivotally
mounted on the supports 28 and 26, respectively, and
for insertion beneath the top panel, conveyer means for
continuously moving a plurality of cartons along a given
path past an end closing station lwith each car-ton having
one side panel leading land the other trailing, a blade,
the carton moves past said station, and blade means at
said station automatically responsive to engagement by
eliminate the sag therefrom as the carton moves past said
station.
5. In apparatus for closing an end of a carton having
cartons’ ends may be completed by providing rollers 80 40 wherein a closing end ñap is connected to the end panel
resiliently urged by springs 84 and 84’ to hold the rollers
against the end panels 16 and 16’ of the continuously 45 means pivotally supporting the blade at one end thereof
for turning movement in a fixed plane |occupied by the
moving carton.
»
underside of each carton’s ltop panel when the top panel
lf desired, the posts 66 and 66’ may be made adjustable
is flat, said blade extending in the general direction of
in height so that the blades “70 and 70’ can be used with
movement of the cartons along said path with the free end
troughs having slots at different elevations t-o be adapted
thereof adapted for entry into a cart-on beneath the top
for use with cartons of different height or distance be
panel thereof, and resilient means for yieldably maintain
tween top and bottom panels. Also, although the springs
ing said yfree end of the blade in the path of movement
’i2 and 72." and the mounting thereof shown in the draw
of the leading side panel for eng-agement 'and movement
ings and described above is preferred, other forms of
thereby in oppositionjto ‘said resilient means, said re
yieldable means may be used. For example, these
springs may be replaced by wire springs coiled around 55 silient means moving said free end of the blade beneath
the top panel when the leading side panel moves beyond
the pivot pins 68 and 68', bearing at one end against
the blade’s free end, whereby the blade supports the top
the blades, and having their other ends stationary.
panel at its underside to eliminate sag therein, said blade
Furthermore, other suitable configurations may be used
being turned by engagement with the trailing side panel
instead of the preferred blade control shown in the draw
rto eject the »blade from the carton, said resilient means
ing. These, and other changes will be apparent from the
returning the blade for engagement of the free end there
foregoing detailed description, and such changes are Con
of by the leading side panel of the next carton.
templated within the spirit and scope of the invention as
6. In an apparatus as lset forth in claim 5, means at
'
said station for turning the end panel of the moving
I claim:
l. in apparatus for closing an end of a carton hav-ing 65 carton up to the 'top panel and the closing end ñap
sought to be defined in the following claims.
top and bottom panels, side panels, an end panel adapted
to be turned up from said bottom to said top panel, and
wherein a closing end llap is connected to the end panel
for insertion beneath said top panel, means for contin
beneath the ‘top panel while -the latter is supported by said
blade, the blade acting to guide the closing end flap
beneath the top panel.
7. Apparatus for closing Áan end lof a carton having top
uously moving the carton past an end closing station, 70 and bottom panels, side panels, an end panel to be turned
up from the bottom to the top panel, and wherein a
and means at said station responsive to engagement by
closing end ñap is connected to the end panel for in
the carton for Imaintaining the portion of the top panel
sertion beneath the 'top panel, said apparatus comprising
intermediate the iside panels at the elevation of the por
ya support having a surface along which said end panel
tions `of the top panel immediately adjacent the side
panels, whereby the top panel c-annot sag to interfere 75 slides before being turned up, a trough carried by said
3,071,910
7
8
support for guiding said end panel up to 'and said clos
blade for engagement of the free end thereof by the lead
>ing side panel of the next carton.
ing end flap beneath the top panel, said trough being
provided with a slot lying in a plane occupied by the
underside of the top panel when ’the top panel is flat, a
ñat blade having a portion thereof extending through
the slot, means exterior of the trough for pivotally sup
porting the blade, and resilient means urging the blade
beneath the top panel to engage the understide thereof
l0. Apparatus for closing an end of a carton having
top and bottom panels, side panels, an end panel adapted
to be turned up from the bottom to the top panel, and
wherein a closing end ñap is connected to the end panel
for insertion beneath the top panel, said apparatus com
prising conveyer means for continuously conveying a
to eliminate sag in the top panel.
plurality of cartons past an end closing station along a
8. Apparatus for closing an end of a carton having 10 given path with each carton having one side panel leading
and the other trailing, a support having a face along
top and bottom panels, side panels, an end panel to be
which said end panel slides and is located in the same plane
'turned up from the bottom »to the ytop panel, and wherein
as the bottom panel, a trough through which the end panel
a closing end flap is connected to the end panel for in
and closing end flap of each carton are confined for fold
sertion beneath the top panel, said apparatus compris
ing `a support having a ilat top face, a trough mounted 15 ing as the cartons move past said station, said trough being
carried by said face of said support and being provided
on said face having a longitudinal free edge vspaced from
with a slot lying in a plane occupied by the underside of a
and parallel to said face and a hollow interior directed
top panel when the top panel is flat, an elongated wedge
toward said face, said trough being provided with -a slot
in said trough beneath said slot, said wedge having a top
adjacent said free edge located in a plane parallel to
said face and lying in a plane occupied by the underside 20 surface rising up from said face of the support in the di
rection of travel of the cartons, the wedge being located
of the top panel when »the top panel is ñat, a post car
in the path of movement of said end panel for engaging
ried by said support outside of said trough, a ilat blade
and turning the end panel up to the top panel and co
pivotally supported by the post and extending through said
operating with the trough to direct the closing end flap
slot for movement with respect to said trough, and re
silient means yieldably maintaining said blade in la pre 25 beneath the top panel, a post carried by said support
outside of said trough, a flat blade extending through said
determined rest position.
slot pivotally supported by the post, said blade extending
9. Apparatus for closing an end of a carton having top
from the post in the general direction of movement of
and bottom panels, side panels, an end panel adapted to
the cartons along said path with the free end thereof
be turned up from the bottom to the top panel, and where
in a closing end ñap is `connected to the end panel for in 30 adapted for entry into a carton beneath the top panel
thereof, and resilient means for yieldably maintainin said
sertion beneath the top panel, said apparatus comprising
free end of the blade in the path of movement of the lead~
conveyer means for continuously moving a plurality of
ing side panel for engagement and movement thereby in
cartons along a given path past an end closing station
opposition to said resilient means, said resilient means
with each carton having one side panel leading and the
other trailing, a trough in which the end panel and clos 35 moving said free end of the blade beneath the top panel
when the leading side panel moves beyond the blade’s
ing end flap of each carton are conñned for folding as
free end, whereby the blade supports the top panel at its
the cartons move past said station, said trough being
underside to eliminate sag in the top panel, said blade
provided with a slot lying in a plane occupied by the un
being turned by engagement with the trailing side panel to
derside of a carton top panel when the top panel is flat, a
dat blade extending through the slot, means exteriorly of 40 eject the blade from the carton, said resilient >means re
turning the blade for engagement of the free end thereof
the trough pivotally supporting the blade at one end there
by the leading side panel of the next carton.
of for turning movement in a fixed plane, said blade ex
tending in the general direction of movement of the cartons
References Cited in the tile of this patent
along said path with the free end thereof adapted for
entry into a carton beneath the top panel thereof, and 45
UNITED STATES PATENTS
resilient means for yieldably maintaining said free end of
1,439,536
Andrews et a1. ______ __ Dec. 19, 1922
`the blade in the path of movement of the leading side
1,724,124
Boileau _____________ __ Aug. 13, i929
panel for engagement and movement thereby in opposi
tion to said resilient means, said resilient means moving
said free end of the blade beneath the top panel when 50
the leading side panel moves beyondthe blade’s free end,
whereby the blade supports the top panel at its underside
to eliminate sag in the top panel, said blade being turned
by Vengagement with the trailing side panel to eject the
blade from the carton, said resilient means returning the 55
2,118,488
2,340,835
2,682,210
Butler ______________ __ May 24, 1938
Malhiot _____________ __ Feb. l, 1944
Bivans ______________ __ .lune 29, 1954
2,685,158
2,844,930
2,948,094
Von Haase ___________ __ Aug. 3, i954
Nelson ______________ __ July 29, 1958
Wells _______________ __ Aug. 9, 1960
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