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Патент USA US2085478

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June 29, 1937.
H. T. sccrrïI
Filed‘oct. 1e, 1934
5 Sheets
-Sheet 1
June 29, 1937.
H. T. scQTT
Filed oct. 16, 1954
S sheets-sheet 2
June 29,1937.
H. T. Asczo'r'r
2,085,478 y
Filed not. 1e, 1934
5 sheets-sheet s
June 29, 1937.
Filed o'ct; 1e, 1954
I I Il
////’ J1.
5 Sheets-Sheet 4
l`.lune 29,1937.
H. T. sc’oTT
Filed 001'.. 16, 1954
5 Sheets-Sheet 5
Patentedv *June* 2,9, 1937
Henry T. Scott,> Toledo, Ohio, assignor to The
' American Paper Bottle Company, Toledo, Ohio,
a corporation of Ohio
Application October 16, 1934, Serial No. 748,566
11 Claims. ,
The present invention relates to folding mecha
I nism and particularly to mechanisms for folding
- and closing the‘foldabley end portions of tubular
as has been disclosed in my copending applica
tion and by means of which this operation may
be rapidly and accurately carried out in an auto
matic manner. Nevertheless, the principles of
containers. The present application is acontin
nation in part of my earlier application, Serial the invention may be embodied in machines which
vary widely in the design and arrangement ofv
N0. 603,861, filed April '7, 1932.
In my application, Serial No. 686,300, filedÁ _their component elements and which are well
adapted to effect the closure ofthe foldable or
August 22, 1933, is disclosed and claimed a con
tainer fabricated of paper, _and coated both ex -collapsible ends of tubes or containers of various
designs and sizes. One embodiment of the in
10 teriorly and interiorly with a liquid proofing sub
vention is illustrated by Way of .example in the
stance such as paraffin, the container being pri
marily intended for the packaging, storage- and_ acìompanying drawings, in which
Figure 1 is an' end elevation of the closure fold
dispensing of liquids. It is fabricated of rela
tively stiff paper, is square in cross section and ing mechanism;
_Figure 2 is a side elevation of the same;
15. has an extension which is as disclosed, divided
Figure 3 is a section on line 3-3 of Fig. 1;
into panels by means of score lines and which
Figure 4 is a section on line 4-4 of Fig. 2;
extension is adapted to be collapsed or folded
. after `the -container has been charged to close
the end-thereof. In the complete operation of
closing the foldable end portion of the container,
it'is desirable that the integrity of the panels be
maintained and that these panels be relatively
folded only aion'g the score lines specifically pro-'
vided for that purpose when the blank was orig
inally cut. In my copending application, Serial
No. 748,561, filed October 16, 1934, is described a
mechanism ,for performing a preliminary opera
tion upon the foldable end of the container, this
mechanism effecting by its operation a partial
Figure 5 is a section on line 5-5 of Fig. 1;
Figures 6 to 11 inclusive are views, rather dia
grammatic in section, which portray the several 20
movements of the folding members of the appaf‘
ratus which these members perform in sequence
in effecting the complete closure of a container;
-Figure l2 is a perspective view of the foldable
end of a tubular container of the type disclosed
in my copendingvapplication above referred to
‘and which the mechanism now to be described is
primarily intended to act upon;
score lines, an operation particularly desirable
Figure 13 is a perspective view of the upper end y
of a container which is ready for closing; and
Figure 14 is a perspective View of the upper
where the container as a whole has been impreg
end of a closed container.
30 fold along the score lines, or a redefinition of the
nated with parafñn and thereby considerably
stii‘fened. In this redeflnition of the score- lines
of the end closure all or a portion only of the
score lines4 may be redefined but in any event a
suñicient redeñnition of the score lines is real
ized to render the container end more readily col
` lapsible by the means which comprises the sub
40 ject matter of thepresent application.
The container disclosed in the application pre- .
viously referred to includes, in its foldable end
portion, not only a plurality of panels hingedly
connected together along the score lines but also
two end flaps and it is desired that, in the closing
operation, one of these end flaps be inserted into
> the mouth of the container` and the other turned
' ` over so as to overlie the ñrst mentioned flap and
also the several plies of paper which are gathered
togetherin the closing operation to form what
may be designated a' central transverse rib. The
present invention embodies a plurality of folding
ins‘trumentalities which are primarily designed
and constructed. for the manipulation ofthe end
closure panels'and-end flaps of a container such
The container, partially illustrated in Figure
12, is formed of relatively stiff paper and is square
in horizontal section, its bottom being closed' and
ther entirek container being coated with paraffin
exteriorly and interiorly. ' Its foldable end clo
sure is indicated generally at C in Figure 12 and
is seen to comprise a-plurality of panel sections P
which meet along score lines S. When in this 40
condition the end closure is relatively stiff and,
prior to charging, it is desired that the score lines
be redefined, either wholly or in part, by sub
jecting the panels to pressures which tend to
move them into different .planes while at the
same time maintaining the integrity of the panels
by confining the Aiiexure entirely to the score lines
or hinge lines. A mechanism for redefining thescore lines is vdescribed in my copendiñg. applica
tion, Serial 748,561, ñled October 16, 1934, and 50
after the score lines are thus redefined the con
tainer end closure may have the appearance indi
cated in Figure 13; The container may then be
charged with a liquid or with a. solid after which
it is necessary to effect the final .complete closure 55
of the container by collapsing inwardly two op
ward movement of ñap inserting finger I9 halted
posing side sections of the foldable extension and
so that the flat under surface of the portion I8
folding downwardly upon these previously col
of this ñnger comprises a guide for flap II.
This continued motion of the folding members
lapsed side sections the remaining two side sec
tions, the upper edges of all four side sections be
ing gathered together to form a central trans
verse rib and the two end flaps being folded
down to lie parallel with the plies of paper which
comprise this rib. It is the function of the pres
ent apparatus to receive containers having end
closures of the general type illustrated in Figure
12, and which closures have been subjected to a
preliminary score redefining operation so that
I5 and I6 causes downward deflection of the
foldable side walls of the foldable container ex'
tension and introduction of the flap II into the
rapidly closing mouth of the container, as shown
in Figure 8, the edge of flap II being guided
downwardly by the inclined inner surface of the 10
side wall opposite to that to which it is attached,`
as shown in Figure 8. In Figure 8 it will be ob
served that the flap inserting finger I9 has been
they are reduced to the condition shown in Figure - ` retracted as it is no longer necessary for this
15 13, and to then ac‘t upon such closures to produce .
the closed, sealed‘container illustrated in Figure
14 which, when completed, is rigid, durable and
leak proof.
In'Figure 6 of the drawings means for per
v20 forming the first operation of folding is illus
trated. It will be perceived that the' container is
supported in such manner that its foldable upper
end extension lies between opposing folding mem
bers. It is so positioned that the collapsible
25 sides of the container are disposed in planes sub
stantially parallel to the planes of movement of
the folding members and its foldable sides are
positioned so as to be directly acted upon by
these folding members, the end flaps I0 and II
30 being upward continuations of the foldable sides.
The base of the container may be supported in
any suitable manner but preferably rests upon
supporting rails I 2 and is preferably securely
held between gripping members I3 forming parts
35 of a conveyor chain I4 by means of which it
may be moved with a step by step movement.
For a more full and complete description of the
container supporting and advancing means, ref
erence may be had to my copending application,
Serial 748,565, ñled October 16, 1934. Folding
members are indicated at I5 and I6 respectively
and a flap inserting member is indicated gen
erally at I1. It is by the «conjoint action of
these Vthree members that the preliminary fold
ing operation is performed. 'I'he first member to
act is the flap inserting finger I'I. This mem
ber comprises a horizontally extending flap bend
ing and guiding portion I8 rigidly affixed to the
upper end of an operating arm I9 the lower end
50 of which arm is rotatably supported for move
ment about a fixed axis. By mechanism herein
after to `be described the arm may be given a
swinging or rocking movement about stud 20.
Its initial rocking movement, after a container is
member to function as a. guide for the flap II 15
and inasmuch as it is also desirable to remove
the flap engaging portion I8 of this member to
avoid interference with the upper end I6’ of the
folding member I6. Simultaneous downward
movement of the folding members I5 and I6 is 20
further continuedA until the upper edges of the
sidesl ofthe foldable extension meet as shown in
Figure 9, the container top being thus closed, the
flap II being entirely enclosed within the same
while the nap I0 still rests against the extension 25
I6’ of folding member I6. In order to fold ñap
I0 downwardly, a flap folding and pressure ap
plying member or grooved roller 2|] is caused to
descend vertically from its retracted or full line
position (Figure 9), to its operative or dotted line 30
position. The roller 20 functions While folding
members I5 and I6 are still in their operative
positions, as shown in Figure 9 and the ilap I0
is deflected downwardly thereby to its dotted line
position, at least the end positions of the flap I0 35
are so positioned, one edge of one end portion
being indicated in dotted lines in Figure 9, the
central‘portion of this flap being pressed tightly
against the inclined upper surface of the con
tainer. Naturally clearance must be provided to 40
permit the downward movement of roller 20 to
contact with the container while the members I5
and I6 are 'still in contact therewith and the
exact shapes of the several members, whereby
this clearance is obtained, will be hereinafter 45
more fully described. After the ñap folding and
pressure applying member 20 is positioned as
shown in dotted lines in Figure 9, the folding
members I5 and I6 are rocked simultaneously
upwardly and outwardly, the container top then ,
being held entirely by the roller 20 at its top and
the holding and supporting means at its bottom.
It will be observed from an inspection of Figure 9
that portions of the folding member I5 underlie
portions of the container .flap I0. This member
55 positioned as shown in Figure 6, is in an anti
clockwise’direction and the leading edge of its
portion I8 immediately strikes the outer surface
however is` formed in two parts, a lower part I5’
of flap II, defiectìng this flap into the position
shown in Figure 6, the flap bending readily about
connected together in such manner that the part
I52 may rotate in a counter-clockwise direction
the score line intermediate -its base and the up
per edge of the foldable side wall of the end
relatively to the part I5’ about pivot 2I, but may 60
extension. The movement of the ñap inserting
finger is continued and, when it reaches the po
and an upper part |52, these parts being hingedly
not rotate in the opposite direction. When mem
ber I5 therefore begins its clockwise rotation or
retracting movement, part I52 will be Caused to
sition in which it is shown in Figure 7, the flap . rotate because of the opposition to its movement
by the iiap I0, relatively to the part I5’ but will
65 II is moved into substantially horizontal posi
tion, In the meanwhile and by means of other eventually be withdrawn from under the flap
mechanism to be later described movements of
the two bending members I5 and I6 have been
simultaneouslyA initiated, these bending ñngers
70 contacting with the upper edges of the side walls
whereupon part |52 will spring back into align
mentswith part I5' under the influence of spring
22. The functions of the several folding mem
bers I5, I8 and I8 have vthen been fully per
of the foldable extension and the extreme upper
end I8' of the bending member I6 having con
formed and it is necessary to advance the con
tainer to a further station to be acted upon by
tacted and partially deflected the outer foldable
flap I0. The simultaneous movement of fold
ing members ÀI5 and I8 is continued and the for
collapsing and rib forming members. When the
conveyor is actuated to bring about this transfer
the container moves out from under the roller 20
which is still in its lowermost or container hold
ing' position, and under stationary guide and
holdingl members 23 rigidly supported upon the
frame. The lower rounded edges of these guid
ing members 23 press tightly against the sides of
from cam 34 the roller 45 lying within the cam
way of this cam being carried upon the lower
end of an arm 46 the upper end ,of which is fixed
the container top to hold it in its collapsed con
dition, as shown in Figure 10. While still held
in oscillation of shaft 41. Shaft 41 in turn car
ries two toothed segments 48 and 49 the teeth '
by guiding members 23` the flat inclined side walls
.of these segments meshing with mating teeth
of the ‘container top are acted upon by collapsing
members 24 which swing downwardly simul
formed upon vertically reciprocable racks 58 and
5 I_. Rack 50 is provided with a second set of teeth
disposed at right angles to those which mesh with
segment 48 the teeth ofl this second set, or second
rack meshing with. teeth of segment 52 integral
with hub 53, which is the hub upon which the
folding member I5 is mounted, member I5 and
hub 53 being preferably integral and hub 53 being
fixed upon shaft 25. Folding member I6 is in
tegral with a hub 54 rigidly mounted upon the
taneously from opposite sides of Athe container,
about the axes of shafts 25 upon which they are
clamped or otherwise fixed, it being the function
of these members to further break down the en
tire foldable .end closure about‘its several score
lines and more particularly to form a central
transverse rib by flexing the incline'd side walls
of the end extension about the score lines 26C,
one of which isindicated in Figure 13 and where,
20 up until this time, little if any flexure has 0c
curred. This further breaking down of the fold
able end extension of the container isquickly
effected and simultaneously a pressure applying
and rib holding'member 26 is caused to descend,
25 4this member having a plurality of rollers 21
mounted in a longitudinallyl extending recess
formed in its lower edge, which rollers bear upon
the top of the rib -28 which has just beenv formed
upon the container. - Member 26 also includes in
.30 turned edges 26’ which bear against the sides of
the rib and prevent spreading of the several plys
upon a shaft 41 so that rotation of cam 34 results
second shaft 25 and which hub also carries a
segment 56 the teeth of which mesh with teeth 20
of rack 5I, there being a second set of teeth also
formed on this rack and facing at an angle of 90°
from the teeth which mesh with segment 49.' >By
means of the mechanism just described it will be
perceived that both folding members I5’ and I6
operate simultaneously at all times and move in>
opposite directions so as to apply equal pressures
to the foldable container end extension in per
forming their functions.
The flap folding and pressure roller 20 takes 30
of paper of which the rib is composed, particu
larly preventing the outer flap I0 from springing
upwardly. Once member 26 has been positioned
the collapsing members 24 may be retracted, and
its motion from cam 36, this cam effecting rock-'
`ing movement of bell crank lever 60 one'end of
which carries the cam roller 6I. The opposite
end of bell crank 60 is connected by a pin and
slot connection to the lower end of a vertically
are retracted, and the container may then be
given a further forwardA movement, as to a ma
reciprocable rod 62 suitably mounted in a bear
chine by means of which a staple or other me
upper end of this rod is connected, also by a pin
and slot connection,- the end of a lever 64, pivotally "
chanical fastening device is passed through the
40 several plies of the rib- 28 to secure these plies to
gether and effect the permanent closure of the
The mechanism for operating the several fold
ing instrumentalities which have just been re
45 ferred to will now‘be described. All parts are
mounted upon a suitable frame which may, have
various forms but which, for instance, may in
clude a side frame member 30 and a bridging
member 3I. Rotatably supported in suitable
50 bearings upon frame 30 is a main drive shaft 32
and fixed upon this shaft are four cam members
indicated at 33, 34, 35 and 36. The cam member
33 forms a part of the means for oscillating the
Both folding members I5 and I6'are operated
ing 63 attached to the supporting frame. To the
mounted upon the frame at 65, a segment 66 being 40
mounted upon the opposite end of the lever 4the
teethl of which mesh with the teeth of a vertically
slidable rack 61. The flap folding and pressure
applying roller 20 is rotatably carried in a bifur
cated supporting member 68 attached to the lower
end of rack 61.
„The pressure applying and rib holding member
26 takes its motion from the face cam 35. Thusa vertically reciprocable .rod 10, slidably mounted `
in the frame 3i, carries at its lower end a cam 50
_roller 1Iv whichrrests upon cam 35. Rotation of
the cam therefore brings about vertical recipro
cation of rod 18 and the' movements of this rod
flap inserting finger I9, Abeingoperatively con , are communicated to member 26 _by means `oi.’ the
nected to this finger by means of the lever 31 Ílever 12, pivotally supported at 13 and having one 55
fixed on shaft 38, lever 39 secured upon the oppo
site end of this shaft and carrying ,a segment 4I]
and the rack 4I one set of teeth of which mesh
with segment 40 and a second sei-„of teeth, dis
.6.9 posed at right ‘angles thereto, meshing with a seg
ment 42 carried by the -hub 43 upon which hub
the lower end of the flap inserting finger is also
mounted. Obviously, therefore, rotation of cam
33 causes swinging motion of lever 31, lever 31
carrying a roller 44 `which extends into the cam
way formed in cam 33, oscillation Vof shaft 38,
end connected to rod 10 by a pin and slot con
nection and the other end connected, also by a
rocking of lever 39, reciprocation of rack 4| and
oscillation of hub 43 and hence of the folding
finger. As will be observed from an inspection
70 of Figure 3, the flap inserting finger is an L
‘shaped member, the anvil portion I8 of this finger
being horizontally disposed and overlying the up
per end of folding member I5,> so that there are
maintain c'am roller 1I in tight engagement’wlth
no interferences between members I5 and I9 at
75 any ,tima
pin and slot connection, to the upper end of a
rod 15 mounted for vertical sliding movement in
a suitable bearing rigid with the frame, member
26 being suitably secured to the lower end of this
rod. A collar shaft upon rod 15 is indicated at
11 and a. spring 18 encircling rod 15 has its upper
end bearing against the stationary frame. The
spring 18 therefore functions to normally main
tain rod 15 in elevated position and to therefore \
cam 35.
Naturally the several cams and the con
necting linkages, racks, segments and levers are
so designed and constructed as to produce the'de 70
sired coordinated movements of the various fold
ing and holding members in the normal operation
of the device. From an inspection of Figure 4
it will be readily perceived that the folding mem- \
bers I5 and I6 are so designed as to provide the 75
necessary clearance for4 the descent of roller 20
into contact with the container top, the rockable
portion I52 of member I5 and the upper end of
member I6 being, in effect, bifurcated to provide
a central aperture through which roller 20 may
descend to contact with the container.
Inasmuch as both collapsing members 2| and
also folding members i5 and I6 are ñxedly sup
ported upon shafts 25 the collapsing andfolding
10 members will be simultaneously operated when
for actuating the same, opposed container wall
folding and deflecting members, and means for
simultaneously actuating said members in timed
relation to the movements of said finger to effect
the insertion and enclosure of Said end flap.
4. Mechanism for closing the ends of tubular
containers having foldable end portions and
spaced vprojecting flaps, including means for
initially engaging and inwardly defiecting one
of said ñaps, and means for thereafter down
shafts 25 are rocked. While folding members I5
and- I6 are acting upon the top of one container
wardly and inwardly folding those side walls Aof ,
the foldable end to which the end ñaps are se
therefore, to close the same, the collapsing mem
bers 24 are simultaneously acting upon the pre
cured, said means also folding over the remaining
viously closed top of the adjacent container. 'I‘he
' 5. The method of folding the foldable end
end flap.
collapsing members are so designed and con -closure of atubular container of square cross'
section, said container being fabricated of rela
structed that the ends thereof cooperate in effect
ing a substantial compression of the base of the tively stiiî paper and the foldable end having four
rib lying betw'een their adjacent ends, as these sides each of which is divided by score lines into
panels, two opposed sides thereof having longi 20“
20 members roach the limits of their downward rock
ing movements. 'I'he angles between the base of tudinal score lines and being collapsible and the
the rib and the inclined sides of the bottle top other two having lateral score lines'only and being
foldable, which comprises acting upon the vfold
are therefore clearly defined and sharpened, com
able sides to flex the same bodily inwardly, the `
pression of the rib base in this manner‘also com
pacting the same by pressing the several plies
coll-apsible sides being simultaneously collapsed
thereof into intimate contact, thus stiffening the
and, after the foldable sides are caused to meet
centrally of the container, again acting upon the
As shown in the drawings, particularly in Fig
ures 6 to l0 inclusive there is mounted on folding
member i6 a stop 90 which lies in front of a con
tainer which has been moved into position to be
foldable sides to fold them upon laterally ex
tending score lines, the adjacent panels of the
sides being brought into parallelism to comprise 30
acted upon by the folding elements, that is, the
members of a central transverse rib.
6. The method of closing a stiff paper con
corner of the container comes to rest against
tainer which comprises folding opposite side walls
the stop 90 when the container is properly posi
tioned for folding. Cooperating with this stop is
meet, thus forming a peak, and thereafter bring- ^ `
- a bracket member 9| mounted on a chain, one
bodily toward each other until their upper edges '
ing similar sections of said side walls adjacent
link of which is indicated at 92, this bracket
the peak line into parallelism to vform a central
having constantcontact with the rear wall, of
the container adjacent the diametrically opposite
transverse rib.
40 corner, as it moves along the machine toward
' the closing means. Chain> 92 is fully disclosed
in my copending application, Serial No. 748,565,
filed October 16, 1934. As the container moves
into final position- just below the closing elements
it strikes stop 90 as aforesaid and by the con
joint action of stop 90 and bracket 9| it is squared
and erected if, by any chance,‘ it has twisted
slightly about its vertical axis within the gripping
members engaging the same near its bottom, or
50 if it has accidently been tilted forwardly from
the vertical.
While stop 90 will intercept an unclosed con
tainer, as shown in Figure 6, when folding mem
ber i6 isin inoperative position, it will not inter
cept a closed container when in this position and
hence will not interfere with the movement of a
closed container toward the collapsing arms 24.
Having'thus described the invention, what is
claimed as new and desired to be secured by
60 Letters Patent is:
1. Container end closing mechanism compris
ing opposed movably mounted container panel
engaging and folding members, a container end
flap engaging and deilecting member, and means
V65 for actuating said members in timed relationship
Vwhereby the end flap deiiecting member is actu
ated prior to the panehfolding members.
2. Container end closing mechanism compris-1
ing means for engaging the projecting end nap
70 of a tubular container and downwardly deflect
ing the same toward the interior of the container,
and means for folding inwardly opposing side
walls of the container to enclose said end nap.
3. Container end closing mechanism compris
ing a flap engaging and inserting finger, means
'7. In mechanism of the class described, con
tainer moving and supporting means, container 40
end folding members positioned to act upon con
tainers carried by said supporting means, and
means for correcting the alignment of a container
mounted on said supporting means as_the con
tainer reaches a position to be acted upon by 45
said folding members.
8. Mechanism for relatively folding about
scored hinge lines the relatively foldable panels
of the collapsible end closure portion of a self
supporting container formed> of relatively stiff 50
paper, comprising, means for acting upon and de
ñecting toward the interior of the container an
end flap projecting from the edge of one of said
panels, means for actingupon the panel to which
the end ilap is hingedly connected, and the op 55
posing panel, while said first mentioned means is
acting to hold said end flap in deflected posi
tion, to swing said panels toward each other to en
close and retain therebetween the said end flap,
and means for further acting upon said panels to
bring their inner faces into contact with the end
flap to thereby form a rib.
9. In mechanism of the class described, in
combination, means for gripping the base of a
stiff paper container and advancing the samewith
a step by step motion, means for acting upon the
top of a container to close the same, said means
being positioned adjacent the path of travel of
the container and adapted to act ,when the con
tainer is stationary, and means- for correcting the
position of the container by moving the same
within thel container gripping `means when the
container reaches the container closing means.
10. The combination set forth in claim 9 in
which the last mentioned means includes 'a par’
mounted on the container `closing means and
movable thereby into and out of the path of
travel of the container.
11.- Thecombination set forth in claim 9 in
5 which the last mentioned means includes two c`o~v
operating parts one mounted for movement into
the path of movement of the upper portion of the
l container so as to be contacted by the advancing
face thereof and the other being adapted to con
10 tact with the following face of the container.
12. Mechanism for closing the end of a tubular
container having a foldable »end portion, in
container to form a peaked structure, and there
after breaking down or further folding each of
the folded sides by the application of opposed
forces thereto to form a central rib.
15. The method of folding the foldable end
closure of a tubular container fabricated of rela
tively stiff paper and which end closure is divided
into four sides, two opposing sides being fold
able _and the _other two being collapsible, by s_core -
lines, which comprises collapsing the opposing 1o
collapsible sides of the end closure by folding the
panels thereof relatively to each other, folding the
cluding opposed folding members for acting up
other two opposing sides bodily and without
on opposite sides of said end portion and bodily breaking them along the score lines, and there
15 folding said sides until their upper edges come 'after further breaking down the foldable sides 16
along score lines by the application of opposed
into contact midway of the container, and sec
ond means for engaging said sides respectively, forces to form a central transverse rib.
_ between the contacting edges thereof and the
tubular container to Vfurther fold said sides and
20 form a central rib.
` 16. In a, mechanism of the class described. the
combination with a conveyor of container end
folding means, rib forming means, of means Afor 20
13. Mechanism for folding the scored end ex
tension of .a tubular container comprising means
for inwardly folding two opposed sides of said
extension until the upper edges of said sides con
25 .tact centrally of theA container, and second means .
for further acting upon portions only of said
folded sides to bend said sides about score lines
intermediate the container and the line of con
‘ tact between said sides and parallel to the cen
applying axial pressure upon a container rib sub
sequent to its formation, which means positively
supports the rib against lateral distortion.
17. ~In mechanism of the class described, con
tainer end folding means for forming a peaked 25
end structure, means for acting upon said peaked
structure to form a centrally- ribbed structure, a
conveyor for supporting the bottom of a container
and moving the same from one such means to the
end closure portion of a tubular container which
other, and means 'for supporting and maintain 30
ing the peaked structure as it is moved into posi~
tion to be acted upon by said rib forming struc
ture, said` last mentioned means including a
comprises`Á folding simultaneously toward each
grooved roller. “
30 tral line of contact of said sides, thus forming a
central rib._
,14. The method of folding the scored foldable
' 35 other <two opposing scored side walls until they
are brought into line contact centrally of the
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