Improvements in the Manufacture of Square Bottom Paper Bags.
Year: 1889

page_text: Date of Application, 16th Feb., 1889
Complete Specification Left, 9th Nov., 1889-Accepted, 14th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Square Bottom Paper Bags.
I FREDERICK THOMAS JEFFERSON of High Street West Bromwich in the County
of Stafford Printer Publisher and Stationer do hereby declare the nature of this
Invention to be as follows:-
My invention consists in making square bottom paper bags in the manner
hereinafter described whereby paper bags are produced having flush square bottoms
that is square bottoms the folded parts of which are practically on the same level and
are not liable to be accidentally detached from the bottoms.
In making a paper bag according to my invention I cut out a paper blank in the
ordinary way and form from it a flat open ended tube of paper by pasting its
longitudinal edges together. In that end of the blank from which the square bottom
of the bag is to be made four short longitudinal incisions or cuts are made parallel to
the longer sides of the blank. These slits or incisions when a paper tube is made
from the blank and the required creasings have been made in the blank divide the
end of the tube into four flaps two side flaps and two end flaps each flap being
situated at right angles to an adjacent flap when the end of the bag is opened
out. Each flap has an oblong forin but the end flaps are slightly wider than the
side flaps so that the edges of the former flaps when folded may overlap one
another. The side flaps when folded meet edge to edge. The wider end flaps are
joined to the paper tube by angular or inverted V shaped creases.
The bottom of the bag is made by first folding down the side flaps so that
they meet edge to edge and form the inner layer of the bottom and upon these
folded side flaps the end flaps are folded and pasted to form the outer layer of
the bottom the edges of the said folded end flaps overlapping one another.
The junctions of the two pairs of flaps thus cross the square bottom of the bag
at right angles to one another. The end flaps and the V shaped creased portions
thereof have cach a middle crease which creases are in line with the edges of the
side flaps when the latter are folded down. The middle creases described permit
of the folding of the bottom of the bag flat for storage or carriage.
When the flat paper bag is opened ont or expanded for use it possesses a flush
square bottom the V shaped parts adjacent to what I have described as the end flaps
forming parts of opposite sides of the paper bag.
Paper bags having flush square bottoms according to my invention are
readily and economically manufactured and may be made either by hand or by
machinery.
1
CL 1
Th1000
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Square Bottom Paper Bags.
I FREDERICK THOMAS JEFFERSON of High Street West Bromwich in the
County of Stafford Printer Publisher and Stationer do hereby declare the
nature of my invention and the manner in which the same is to be performed
to be particularly described and ascertained in and by the following statement :-
My invention consists in making square bottom paper bags in the manner
hereinafter described whereby paper bags are produced having flush square bottoms
that is square bottoms the folded parts of which are practically on the same level
and are not liable to be accidentally detached from the bottoms.

page_text: In making a paper bag according to my invention I cut out an oblong paper
blank in the ordinary way and form from it a flat open ended tube or bag of paper
by pasting its longitudinal edges together as hereinafter described. In that end of
the blank from which the square bottom of the bag is to be made four short
longitudinal incisions or cuts are made parallel to the sides of the blank. These slits
or incisions when a paper tube is made from the blank and the required creasings
have been made in the blank divide the end of the tube into four flaps, two side
flaps and two end flaps, each flap being situated at right angles to an adjacent flap
when the end of the bag is opened out. Each flap las an oblong form but the end
flaps are slightly wider than the side flaps so that the edges of the former flaps when
folded may overlap one another. The side flaps when folded meet edge to edge but
they may be made to overlap.
The end flaps are joined to the paper tube by angular or inverted V shaped
creases.
The bottom of the bag is made by first folding down the side flaps so that they
form the inner layer of the bottom and upon these folded side flaps the end flaps are
folded and pasted to form the outer layer of the bottom, the edges of the said folded
end flaps overlapping one another. The junctions of the two pairs of flaps thus cross
the square bottom of the bag at right angles to one another.
When the flat paper bag is opened out or expanded for use it possesses a flush or
nearly flush square bottom the V shaped parts adjacent to what I have described as
the end flaps forming parts of opposite sides of the paper bag.
I will now proceed to describe with reference to the accompanying Drawing the
manner in which my invention is to be performed.
There are
In making a square flush or nearly flush bottom paper bag according to my
invention I cut out an oblong paper blank of the kind represented in Figure 1 and in
that end of the blank from which the bottom of the bag is to be made I make four
short incisions or cuts a, b, c, d as represented in the said Figure 1.
thereby formed in the bottom end of the blank a series of flaps or divided
portions from which the two side flaps and the two end flaps for forming the bottom of
the bag are made.
The end parts e, e when the tube of the bag is made form one of the side flaps and the
middle part forms the other side flap. From the divided parts g, on either side the
parts e, e forming one of the side flaps, the two end flaps of the bottom of the bag are
made. After the blank has been slit to form the flaps one of the side flaps / is folded
back upon the blank in the manner represented in Figure 2. The blank Figure 2 is
next creased at the oblique dotted line marked i so as to produce the blank repre-
sented in Figure 3 and is afterwards creased at the oblique dotted line marked so as
to form the blank represented in Figure 4. The foldings to produce these creasings
may be made by folding the angles of the blank either on the front or back of the
blank. These oblique creasings form one side of the V shaped creasings, at the end
flaps of the bottom of the bag as hereinafter described.
The folded parts of the blank by which the oblique creasings have been made are
unfolded or returned to their original positions and the blank is next made into a flat
tube of paper. This is effected by first folding or creasing the side of the blank
upon the middle of the blank as represented in Figure 5 and afterwards folding the
side m upon the folded side / as represented in Figure 6, the edges of the sides 1, m
overlapping. By pasting the longitudinal edges of the folded blank Figure 6 a flat
tube of paper is made having at its bottom four flaps and two oblique creasings. I
do not limit myself to the formation of the paper tube by the creasings or foldings I
have described with respect to Figures 5 and 6 as the side m may be folded first and
the other side folded upon the folded side; or the folding of the sides and m may be
reversed, that is, they may be folded backwards or on the outside of the blank instead
of inside as described and represented. The bottom of the partly made bag Figure 6
is next folded down transversely at the cross dotted line & upon the unjoined side of the
flat paper tube. The parts of the folded bottom are then opened out into the positions
represented in Figure 7. This is effected by turning back or separating the flap e

page_text: from the flap (which flap e was superposed on the flap by the formation of the
paper tube) and at the same time folding the end flaps gh inwards or flat upon the
Hapf. By the folding inwards and flattening of the end flaps g, the bottom creases
of the V shaped portions of the said end flaps are formed as represented in the
said Figure 7 the top creases of the said ✓ shaped portions p, p having been
previously made at the stages represented in Figures 3 and 4. In completing the
formation of the bottom, the end flaps g h are turned back into the positions repre-
sented in Figure 7 and the side flap e which is perpendicular is folded down upon the
flat side flap the edge of the flap e overlapping that of the flap as seen in Figure 8.
The inner layer of the bottom of the bag is thus formed. The inner faces of the end
flaps g, having been covered with paste they are folded flat upon the folded side
flaps ef the edges of the said folded end flaps overlapping as represented in Figures 9
and 10, Figure 9 representing the end flap folded down and Figure 10 both the end
flaps h, g folded down.
A square bottom to the bag is thus produced.
The junctions of the two pairs of flaps e, f and g h are in this way made to cross the
square bottom of the bag at right angles to one another.
Instead of making the edges of the side flaps e, f overlap the said flaps when
folded may meet edge to edge.
Figures 11, 12 and 13 represent drawn to double the scale of the other Figures the
flat bottomed paper bag Figure 10 opened out or expanded for use, Figures 11 and 12
representing elevations of the bag taken at right angles to one another and Figure 13
a plan of underside of the bottom of the bag. It will be seen by reference to the said
Figures 11, 12 and 13 that the expanded or opened out bag has a flush or nearly
flush square bottom and that the V shaped parts p, p adjacent to the end flaps g, h
when the bag is opened out or expanded for use form parts of the opposite sides of
the opened out bag.
The square bottoms of the bags are used in the folded flat position represented in
Figure 10 for storage or carriage.
Although I have described and represented the making of the side and end flaps of
the bottom of the bag in the blank before the said blank is folded into a flat tube yet
the said flaps may be made in the bottom of the tube itself after the blank has been
folded and pasted into a tube.
Paper bags having flush or nearly flush square bottoms according to my invention
are readily and economically manufactured and may be made either by hand or by
machinery.
Having now particularly described and ascertained the nature of my inven-
tion and the manner in which the same is to be performed I declare that
I claim as my invention of "Improvements in the manufacture of square bottom
paper bags
Making flush and nearly flush square bottoms of paper bags by the formation and
folding of two side or inner flaps and two end or outer flaps in conjunction with
V shaped parts adjacent to the said end or outer flaps the said pairs of flaps being
made folded and secured together substantially as hereinbefore described and
illustrated in the accompanying Drawing.
Dated the Savonth day of November 1889
FREDERICK THOMAS JEFFERSON.