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Патент USA US3081938

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March 19, 1963
R. J. WILLIAMS ETAL
BAG CLOSURE WITH UNRAVEL PREVENTING MEANS
Filed Aug. 5, 1957
1? FIG. I.
MEAN.
3,081,929
United States Patent 0
3,d8l,929
1 ,.
ICC
Patented Mar. 19, 1963
1
2
3,081,929
past the side edges of the bag. The stitching 11 extends
completely throughout the length of the tape and, as
BAG CLOSURE WITH UNRAVEL
PREVENTING MEANS
shown, may be driven through a narrow paper ribbon 17
located on the side of the bag which is referred to as the
Russell J. Williams, Clayton, and Charles V. Brady, St. 5
needle side, this side ‘being the side which faced the
Louis, Mo., assignors to Bemis Bro. Bag Company,
needle of the sewing machine employed for stitching.
> St. Louis, Mo., a corporation of Missouri
In accordance with this invention, the stitching at 11
Filed Aug. 5, 1957, Ser. No. 676,250
9 Claims. (Cl. 229-63)
is of a single thread readily unravelable chain stitch type.
As illustrated in FIG. 6, the single thread used for this
This invention relates to bags, and more particularly 10 stitching is designated 19. As will be understood by
to unravelable stitch type closures for bags.
\ those conversant with the art, the stitching is formed by
Among the several objects of the invention may be
feeding the bag with‘ the tape 9 folded around the end of
noted the provision of unravelable stitch type closure
the bag through a sewing machine having a needle which
constructions for bags, and particularly for multiwall
drives loops 21 of the thread 19 through the bag, thereby
paper bags, which may be easily unraveled to open the 15 forming needle holes 23 in the bag, the loops extending
bag without the use of any tools, and which are practical
and virtually foolproof; the provision of closures of this
character which, while being easily opened when desired,
from the needle side of the tape 9 through the needle
\ holes to the other side of the tape, each loop being laid
over on the said other side and extending through the pre
are strong closures, adapted to withstand strains result
ceding loop 21. This type of stitching is unraveled with
ing from dropping or other rough handling of the bags; 20 ease by taking hold of that end of the thread which is at
the provision of closures of this character adapted for
the trailing end of the stitching in relation to the passage
unraveling of the entire line of stitching in one piece with
of the bag through the sewing machine, this being the end
assurance that there will not be any thread particles that
may contaminate the contents of the bag; and the pro
of the thread at that end of the stitching in the direction
in which the loops are laid over (the right .end of the
vision of closures of this character which are economical 25 stitching as illustrated in FIGS. 1 and 6 of the drawings
in respect to manufacture. Other objects and features
herein). It will be understood that unraveling proceeds
will be in part apparent and in part pointed out herein
by successively pulling out the loops 21, the pulling out
after.
of each loop freeing the next loop so that it may be
The invention accordingly comprises the constructions
pulled out.
hereinafter described, the scope of the invention being 30 Further in accordance with this invention, the stitching
indicated in the following claims.
.
In the accompanying drawings, in which several of
various possible. embodiments of the invention are illus
\ 11 is anchored against unraveling at a point between that
.
end of the tape 9 from which unraveling: progresses (its
right end as viewed in the drawings) and the adjacent
side edge of the bag ‘(the right side edge of the bag). As
ing a closure of this invention;
FIG. 2 is an enlarged plan view of the upper right
corner of the bag shown in FIG. 1;
r shown in FIGS. 1 and 2, this anchoring is effected by
- folding the end portion 15 of the tape which projects
from the right side edge of the bag back on the bag and
adhering the folded-back end portion to the bag by means
' FIG. 3 is a view in elevation of the upper right corner
of adhesive as indicated at 25 in FIG. 2. As shown in
trated,
' FIG. 1 is a view in elevation ofone end of a bag hav
of the bag shown in FIG. 1, illustrating the initial step 40 FIGS. 1 and 2, this folding is on a fold line 27 which ex
in the opening of the bag; .
_
.
tends generally-parallel to the side edge of the bag and
FIG. 4 is a view similar to FIG. 1 illustrating a modi
. which is located somewhat outward from the side edge
of the bag. The end portion 15 is folded over on the
needle side of the bag. The adhesive 25 is preferably
of the bag shown in FIG. 4 illustrating the initial step in 45 located inward from the very end of the end portion of
the opening of the bag;
the tape so that the very end of the tape may be readily
FIG. 6 is a greatly enlarged cross section taken on
grasped to rip the folded-over portion 15 away from the
line 6-6 of FIG. 1 or ‘FIG. 4;
bag when it is desired to open the bag, and also to leave
FIG. 7 is a view in elevation of a corner of a bag
a short portion of the stitching which lies outward of the
showing another possible modi?cation; and,
50 adhesive and is free of adhesive for easy grasping.
FIG. 8 is a view in elevation of a corner of a bag
With the end portion 15 of the tape 9 folded back and
showing still another possible modi?cation.
adhered to the bag as above described, and hence with
‘ Corresponding ‘reference characters indicate correspond
the end portion of the stitching from which unraveling
ing parts throughout the several views of the drawings.
progresses folded back with the tape and anchored to
Referring to FIGS. 1 and 2 of the drawings, a multi~
the bag, unraveling of the stitching such as might occur
wall paper bag having an end closure of this invention is
in the absence of any anchoring thereof is prevented even
?cation;
'
FIG. 5 is a view in elevation of the upper right corner
indicated at 1., For simplicity, the bag is shown as a
under severe strains such as may occur due to dropping
two-ply bag, the inner ply being designated 3 and the
or other rough handling of the bag. It will be observed
outer ply 5. It will be understood that a multiwall bag
that the thread is anchored to the tape at a point outward
usually will have more than two plies. As shown, the 60 of the side edge of the bag, which means that the anchor
bag is ‘a gusseted bag, the gussets being indicated at 7.
is not subject to severe strains which, when the bag is
The closure includes a paper tape 9 folded around the
dropped, come on the portion of the stitching which ex
end of the bag. The tape may or may not be pasted to
tends from one side edge of the bag to the other. With
the bag. If it is pasted to the bag, the paste is applied
the anchor so located it is also insured that there will be
along its side margins in narrow stripes. A line of stitch
no unraveling whatsoever of the stitching inward past the
ing indicated at 11 is driven through the tape and through 65 side edge of the bag such as would open up the bag and
the walls of the bag securing together the walls adjacent
the end of the bag. When the tape has its margins
pasted to the bag by narrow stripes of paste, the line of
stitching is located outward of the stripes of paste. The
cause loss of its contents.
To open the bag shown in FIGS. 1 and 2, all that needs
be done is to take hold of the folded-over end portion
15 of the tape 9 and pull it away from the bag so that
' length of the tape 9 is greater than the width of the bag, 70 it extends laterally outward free of the bag as illustrated
and the tape has end portions 13 and 15 which extend
in FIG. 3, then to take hold of the end of the thread on
3,081,929
'
4
3
the needle side of the bag and pull it. The thread will
readily pull out of the adhesive 25 on the tape and then
her at said point, continued pulling of the thread resulting
may be quickly unraveled and pulled out of the bag as
one continuous length of thread without any possibility
of loose bits or pieces of thread contaminating the con
tents of the bag, as is desirable for certain products, in
2. A bag as set forth in claim 1 wherein said means
particular food products for human consumption and
animal feed. It will be understood that suitable instruc
tions as to the pulling of the end of the tape and the pull
ing of the end of the thread may be printed on the bag.
FIG. 4 illustrates a modi?cation which is in all re
spects the same as that of FIGS. 1 and 2 except that the
end portion 15 of the tape, instead of being folded back
on a line parallel to the side of the bag, is folded back
on a line 29 angled outward at a 45° angle in the direc
tion ‘away from the end of the bag. FIG. 5 illustrates
the end portion 15 of the tape of the FIG. 4 bag as it
appears when pulled free of the bag and made to extend
laterally outward.
'
in unraveling thereof across the bag.
'
comprises adhesive. ~
3. A bag having an end closure constituted by a tape
folded around the respective end of the bag and a line of
stitching driven through the tape and through the walls of
the bag and securing the walls together adjacent said end
of the bag, the stitching being of a single-thread readily
unravelable chain stitch type as to which unraveling pro
resses from one end thereof, the length of the tape being
greater than the width of the bag and the tape having an
extension beyond one side edge of the bag, the stitching
extending to and terminating at the end of said extension
of the tape and being unravelable from its end at the end
of said extension of the tape, and means releasably secur
ing the thread to the extension of the tape at a point be
tween said end of the extension and said side edge of the
bag, the portion of the thread from said end of the thread
FIG. 7 illustrates another possible modi?cation in 20 to said point being free to be released from the tape, said
which the end portion 15 of the tape is not folded back,
means anchoring the thread against unraveling beyond
being left to extend laterally outward from the side edge
said point until said portion of the thread is released and
of the bag, and in which the stitching is anchored by
pulled to disengage the thread from the tape at said point,
means of a spot of adhesive 31 applied to the tape out‘
continued pulling of the thread resulting in unraveling
ward of the side edge of the bag and inward of the end 25 thereof across the bag.
of the tape. To open the bag in this case, it is simply
4. A bag as set forth in claim 3 wherein said means
necessary to grasp and pull the end of the thread.
comprises adhesive.
FIG. 8 illustrates another possible modi?cation similar
5. A bag as set forth in claim 3 wherein said extension
to FIG. 7 except that instead of using a spot of paste for
is folded back on the bag and said means comprises ad
anchoring the stitching, there is used a staple 33 driven 30 hesive securing said folded-back extension to the bag.
through the tape from the needle side and clinched around
6. A bag as set forth in claim 5 wherein said extension
the stitching outward of the side edge of the bag and in
is folded back on a line generally parallel to the side edge
ward of the end of the tape. To open the bag in this case,
the end of the thread may be pulled to pull the thread
of the bag.
7. A bag as set forth in claim 5 wherein said extension
through the staple and release the thread loops to the 35 is folded back on a line which is angled outward in the
left of the staple.
direction away from the end of the bag.
In view of the above, it will be seen that the several
8. A bag as set forth in claim 3 wherein said extension
objects of the invention are achieved and other advan
is free of the bag and said means comprises a spot of ad
tageous results attained.
hesive applied to the thread and the extension.
As various changes could be made in the above con 40
9. A bag as set forth in claim 3 wherein said extension
structions without departing from the scope of the inven
is free of the bag and said means comprises a staple driv
tion, it is intended that all matter contained in the above
en through said extension and clinched around the stitch
description or shown in the accompanying drawings shall
ing.
be interpreted as illustrative and not in a limiting sense.
We claim:
45
1. A bag having a member extending out from one side
edge at one end thereof, a line of stitching driven through
the walls of the bag and through said member and secur
ing the walls together adjacent said end of the bag, the
stitching being of a single-thread readily unravelable 50
chain stitch type as to which unraveling progresses from
one end thereof, the stitching extending to the outer end
of said member and being unravelable from its end at
the outer end of said member, and means releasably
securing the thread to said member at a point between the 55
outer end of said member and said side edge of the bag,
the portion of the thread from said one end of the thread
to said point being free to be released from said member,
said means anchoring the thread against unraveling be
yond said point until said portion of the thread is re
leased and pulled to disengage the thread from said mem
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,385,493
1,668,542
Putney ______________ __ July 26, 1921
Bates _________________ __ May 8, 1928
1,809,103
1,951,599
Bates ________________ __ June 9, 1931
Dever _______________ _._ Mar. 20, 1934
2,051,117
2,093,979
2,260,192
2,550,464
2,815,899
Weber ______________ __ Aug.
Farmer _____________ __ Sept.
Orr _________________ __ Oct.
Gleave ______________ __ Apr.
Swanson ____________ __ Dec.
18,
21,
21,
24,
10,
1936
1937
1941
1951
1957
FOREIGN PATENTS
481,328
339,938
Canada _____________ __ Feb. 26, 1952
Great Britain _________ __ Dec. 15, 1930
531,448
Germany ____________ __. Aug. 10, 1931
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