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Патент USA US3053160

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Sept. 11, 1962
H. BLUMER
3,053,151
DEVICE FOR FOLDING PAPER BOARD BLANKS
Filed June 13, 1960
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Sept. 11, 1962
H. BLUMER
3,053,151
DEVICE FOR FOLDING PAPER BOARD BLANKS
Filed June 15, 1960
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2 Sheets-Sheet 2
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United States Patent O??ce
3,053,151
Patented Sept. 11, 1962
1
2
3,053,151
Hans Blumer, Zurich, Switzerland, assignor to Steiger
A.G. Lithographic, Druckerei, Cartonnagefabrik, Bern,
The foregoing and ancillary objects are attained by this
invention, the preferred embodiment of which is set forth
in the following description and illustrated in the accom
panying drawing, wherein:
DEVICE FOR FOLDING PAPER BOARD BLANKS
Switzerland
Filed June 13, 1960, Ser. No. 35,625
Claims priority, application Switzerland June 18, 1959
7 Claims. (CI. 93—51)
FIGURE 1 is a perspective view of one ‘form of box
erected by the device of this invention;
FIGURE 2 is a vertical sectional view of the box
erecting device and is taken on line 2—2 of FIGURE 3;
FIGURE 3 is a top plan view of the box erecting
This invention relates to improvements in means for
erecting boxes from paper or cardboard blanks and, in
device;
particular, is directed to a new and novel device for fold
line 4-4 of FIGURE 3, and,
FIGURE 4 is a vertical cross-sectional view taken on
ing blanks into rectangular type boxes.
FIGURE 5 is a detailed vertical sectional view of the
,The device of the present invention is particularly,
interconnecting means between the pairs of bending rails
though not exclusively, designed for folding a box having 15 and is taken on line 5-—-—5 of FIGURE 4.
a rectangular bottom, upstanding opposed end walls and
upstanding opposed side walls, the side and end walls
being connected to the bottom by fold lines. The box,
further, includes a tab on the ends of each side wall,
the tabs being connected thereto by hinge lines and being
positionable at right angles to the side walls and extend
Referring now more particularly to the drawings and,
initially to FIGURE 1, the box, which is representative
of the type of boxes for which the present device has been
designed, includes a rectangular bottom 1 and opposing
side walls 2 and opposing end walls 3. The side and end
walls are connected with the bottom by fold lines.
Each
ing inwardly toward the end walls. The tabs terminate
of the side walls has at its ends a tab 4 which is hingedly
at their free ends in upstanding locking projections and
connected thereto and which is positionable at right
are adapted to be positioned through vertical slots formed
angles inwardly towards the end walls. Each tab is pro
in the end walls adjacent the end portions thereof. The 25 vided at its free end with an upstanding holding projec
end walls are also provided with upwardly projecting
tion 5. The end walls 3 are provided, adjacent their
?aps which are connected by fold lines to the upper
edges of the end walls. The ?aps extend above the
coplanar upper edges of the end walls and the side
outer ends, with vertical slots which are adapted to
receive the tabs 4 and projections 5. The end walls are
provided at their upper edges with flaps 3b which are
walls and are adapted to be folded over under a lid or 30 connected to the upper edges by fold lines. The ?aps
are adapted to lie under the cover or lid, when the cover
cover which is hingedly carried by the upper edge of one
of the side walls. The slots extend into the ?aps and
the locking projections ?t through the slots in the ?aps
and are adapted to be folded over when the ?aps are
bent over under the cover.
'
The device of the present invention comprises a sta
tionary part and a die or moving part cooperating there
with. The stationary part provides a rectangular open
ing through which the die passes in erecting the box from
a blank.
The stationary part includes a ?rst pair of
parallel, laterally spaced bending rails and a second pair
of parallel, laterally spaced bending rails, the rails of the
second pair being disposed at right angles to the rails of
the ?rst pair and being positioned in vertically spaced
relation thereto.
The upper pair serves to bend over the
is closed and the ?aps fold over the projections 5 to lock
the tabs securely in the slots.
,
The device for erecting the box of FIGURE 1 is shown
35 in FIGURES 2-5 and includes a stationary part A and
a die or moving part B which cooperates therewith for
erecting the ‘side and end walls 2 and 3 of the box. The
stationary part provides a rectangular opening through
which the die passes, the die being moved in the direction
of the double arrow 7 by suitable means (not shown).
The stationary part A includes a ?rst pair of bending
rails 8, 8 and a second pair of bending rails 9, 9. The
bending rails 8, 8 are spaced laterally apart and are dis
posed in parallel relation while the bending rails 9,v 9
are also spaced laterally apart in parallel relation. The
end walls provided with slots and the tabs of the side 45 bending rails 9, 9 are disposed vertically below the bend
walls. -The upper pair of rails carries a plurality of
ing rails 8, 8 and are positioned in right angular relation
spring urged balls which are disposed normal to the path
thereto. The bending rails are spaced apart in an
of movement of the die and which are positioned in
adjustable manner depending upon the height of the box
depending relation to the rails of the ?rst pair. Certain
to be erected and are spaced vertically apart in the direc
of the balls are arranged directly below the bending rails 50 tion of motion of the die B.
of the upper pair and serve to push the portions of the
The bending rails are curved at their inner faces so
end walls that lie outside of the slots into corresponding
as to easily receive and fold up the walls of the box
recesses in the die so as to open the slots. The rails
as the box is moved through the opening of the stationary
of the lower pair serve to fold up the side walls and force
part in contact with the curved inner faces of the bend
55
the tabs into the slots. Certain of the balls lie substan
ing rails.
' tially well below the rails of the ?rst pair and substantially
Each of the bending rails is formed on its outer side
in the plane of the rails of the second pair. They serve
with a longitudinally extending dove tail groove 10.
to counteract the tendency of the holding projections to
Connecting links 14 are disposed between the upper pair
slip out of the slots.
of rails and the lower pair of rails and are mounted
Thus, the primary object of the present invention is to 60 as shown in FIGURE 5; Thus,- the links are mounted
provide a device for easily and quickly folding ‘cardboard
in the dove tail grooves by means vof interior clamping
blanks into box formations by causing the foldable side
members 11 and screws 13. The connecting links are
and end walls to be folded into erected positions and
also connected to the lower rails 9 which have dove tail
locked in their box form.
.
'
grooves
10 by means of the interior clamping members
A further important object of the present invention 65 16 and screws 15. The screws 15 pass through vertical
is to provide an adjustable structure wherein the rails are
slots 15:; in the connecting links, as shown in FIGURES 4
interconnected and are joined in an adjustable manner
and 5, so that the vertical distance between the upper
so that the rails of each pair can be moved laterally
pair of rails and the lower pair of rails can be adjusted.
closer or apart and the pairs of rails can be vertically
Thus, it can be seen that the width and length of the
70
spaced in an adjustable manner whereby boxes of various
rectangular opening in the stationary part which is de?ned
sizes can be erected.
by the upper pair of bending rails and the lower pair
3,053,151
3
upper pair of bending rails and the lower pair of bending
rails can also be adjusted so as to be substantially equal
to the height of the box to be erected.
to extend inwardly toward the end walls and having a
locking projection and the end walls having vertical slots
A ?rst pair of spring urged balls 17 and 18 is posi
tioned directly below each of the bending rails 8 of the
upper pair, as can be seen in FIGURES 2 and 4.
4
type having a rectangular bottom and a pair of opposing
end walls and a pair of opposing side walls, said walls
being connected to the bottom by fold lines, each of said
side walls having a tab positionable at right angles thereto
of bending rails can be adjusted so as to accommodate
di?erent sizes of blanks. The vertical space between the
to receive the tabs and projections and having upper
edges provided with hinged ?aps into which the slots
The
extend; said device comprising a stationary part having
balls 17 and 18 are spaced apart and are disposed adja
cent the inner surfaces of the bending rails 9, 9, as shown 10 an opening and a die movable in a rectilinear path through
the opening to erect the box from a ?at blank, said
in FIGURE 4. A second pair of spring urged balls
stationary part including a ?rst pair of bending rails
19 and 20 is disposed below each of the bending rails 8
disposed in parallel, laterally spaced relation and a second
and the balls 19 and 20 are positioned at a height sub
pair of bending rails disposed in laterally, spaced parallel
stantially equal with the lower edges of the lower bend
ing rails. The balls 19 and 29 are positioned between 15 relation, the second pair of rails being vertically spaced
below the ?rst pair and being in right angular relation
the balls 17 and 18 and are substantially close together.
thereto, the upper pair of bending rails serving to bend
As shown, in detail in FIGURE 2, each of the balls
over the end walls and the tabs of the side walls, and a
is guided in a sleeve 21 which is screwed onto a screw
bolt 22 and secured by means of a lock nut 23. The
screw bolts 22 are mounted in apertures in supporting
plurality of freely rotatable spring urged balls lying below
the ?rst pair of rails in substantially the same vertical
planes and being mounted to move transversely to the
direction of movement of the die, certain of said balls
being arranged intermediate the rails of the ?rst and
second pair and being adapted to push inwardly the
portions of the end walls that are outside the slots into
straps 24 and 25 and held in place by lock nuts 26. The
straps 24 are provided for the balls 17 and 18 while the
longer straps 25 are provided for the balls 19 and 20,
as can be seen in FIGURE 2.
By displacing a sleeve 21 along a screw bolt 22 it is
corresponding recesses in the die in order to open the
possible to modify the pressure exerted by the coil spring
30 on the balls, the balls being held from complete
urgement out of the sleeves by the slightly inwardly bent
slots to receive the tabs, said tabs being moved into
the slots by the bending rails of the second pair which
serve to fold up the side walls and certain of said balls
outer ends of the sleeves, as shown in FIGURE 2. The
30 being disposed at a level substantially below the lower
coil spring seats against the outer ends of the bolts.
pair of bending rails to bend the ?aps down and lock
The straps 24 and 25 are attached, as shown in FIG
the tabs in place by bending over the projections.
.
URE 2, to the upper rails by means of clamping members
2. The combination of claim 1, wherein said bending
29 which are mounted in the dove tail grooves in the
rails of each pair are laterally adjustable relative to each
upper rails, clamping and guide members 28 and screws
other.
27; A strap can be adjusted by loosening a screw 27
3. The combination of claim 1, wherein the ?rst and
so as to be displaced along the axis of a rail 8. The
second pairs of bending rails are mounted for vertical
straps are adjustable to position the balls along the rails
depending upon the size of a box to be erected.
_
adjustment.
4. The combination of claim 1, wherein the bending
In using the device, a paper board blank, is ?rst placed
by hand or by suitable mechanical means upon the upper 40 rails of the ?rst pair are connected to the bending rails
of the second pair by connecting links and means mount
bending rails in such a way that it is centered with the
ing the links for vertical adjustment relative to the pairs
die B. In other words, the bottom wall of the blank 1
of rails and for adjustment along the longitudinal axes
is positioned so that it covers the opening in the stationary
of the rails of each pair.
part A. As the die moves downwardly, the, end Walls
5. The combination of claim 1, wherein the spring
3 and‘ tabs ‘4 are first bent upwardly by being moved 45
urged‘balls are mounted in holders carried by straps that
against the bending rails 8. As soon as the bottom wall
depend from the rails of the ?rst pair, said straps being
1 comes within the'range of the lower bending rails 9, 9,
adjustable vertically and along the axes of the rails of the
the portions 3a of the end walls, which lie outside the
?rst pair.
slots 6, will bev in’ the range of action of the balls 17
6. The combination of claim 5, wherein the holders
and 18 which then operate to push the portions 3a
includemeans for adjusting the spring tension on the
inwardly into the concave recesses 31 of the lateral faces
balls.
of the die facing the same, as shown'in FIGURE 2.
.7. The combination of claim 1 wherein each of the
Thus, the slots 6 are open. While the balls 17 and 18
spring urged balls is mounted in an outer end of a tubular
are still active to keep the slots 6 open, the side walls 2
come within the, range of the~lower bending rails 9, 9. 55 holder with the inner end of the tubular holder being
threaded onto a support member, and the spring urging
Asthese side walls2 are being erected, the tabs will
the ball being disposed within the tubular holder between
slide from under the balls 17 and, 18 into the slots 6.
the ball and the support, with the adjustment of the
This operation is substantially terminated as soon as the
tension of the spring being accomplished by rotating the
base’ portion or bottom wall 1 reaches the lower edge
o_f_the lower bending rails 9, 9. At this point, the balls 60 tubular holder with respect to the support.
19 and 20 push the flaps 3b inwardly to bend them about
the fold lines 30. The ?aps 3b and the holding projec
References Cited in the ?le of this patent
tions 5 are thereby bent inwardly about the folding
UNITED STATES PATENTS
lines- 30.
While-the: preferred form of the present invention has
been shownpande described» herein, other forms can be
realizedpascome within- the scope of the appended’ claims.
I claim:
,
1. A device for erecting of paper board boxes of the
2,553,733
2,798,416
2,832,270
2,921,507
2,942,533
Acker _____________ __ May 22,
Clement ______________ __ July 9,
Pierce et a1 ___________ __ Apr. 29,
Hedlund et al. _______ __ Ian. 19,
Atkinson ___________ __ June 28,
1951
1957'
1958
1960
1960
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