An Improved Combined Plate and Flap for Use in the Manufacture of Paper Bags.
Year: 1898

page_text: Date of Application, 8th Nov., 1898
Complete Specification Left, 28th July, 1899-Accepted, 2nd Sept., 1899
PROVISIONAL SPECIFICATION.
An Improved Combined Plate and Flap for Use in the Manufacture of
Paper Bags.
We, JAMES BOOTH, of Charlotte Street, in the City of Birmingham, Printer,
and FREDERICK BARTON CROWTHER, of 230, Lozells Road, Birmingham, aforesaid,
Printers Manager, do hereby declare the nature of this invention to be as
follows:-
This invention consists of the herein described improved combined plate and
flap for use in the manufacture of paper bags by which the paper to form the bag
can be completely folded and pasted and the bag finished by an inexperienced
person before the plate is removed from the bag thereby effecting a considerably
saving in time over making bags on the ordinary combined plate and flap, from
which the partly finished bag has to be removed before the folding down and
pasting of the two bottom corners, which has to be performed (after the plate
and flap are removed) as a separate operation requiring considerable skill on
the part of the operator to fold the two corners down the right amount and
parallel with each other.
We will describe this invention by referring to the accompanying drawing on
which Fig. 1 is a front view of our improved combined plate and flap for making
square bottom paper bags; Fig. 2 is a side view of the same; Fig. 3 shews the
paper bag partly formed with the plate inside it; Fig. shews the finished
paper bag which is of the usual kind and Fig. 5 shews our improved combined
plate and flap for making those bags in which the bottom is oblong.
In carrying out this invention we take a plate A of the usual shape shewn
by Fig. 1, that is to say, the end portion of the plate above the line X X in Fig. 1
has the shape of one half of the bottom of the folded bag, the sides u¹ a³ of the
plate being inclined at an angle of 45 degrees with the line X X, and the side a³
of the plate being parallel with the line X X. Hinged to this plate A at d
on the line X X we provide a flap B which corresponds in shape to one half of
the bottom of the bag and the part of the plate A which is above the line X X,
that is to say, the two inclined sides 61 62 of the flap B correspond respectively
with the two inclined sides a a² of the plate A and the third side 63 of the flap B
corresponds with the side a³ of the plate A.
In using our said improved combined plate and flap, the flap B is first turned
up flat against the plate as represented by the dotted lines in Fig. 2 and the
plate and flap are laid flap downwards on the sheet of paper the sides of which
are then folded over the sides of the plate and pasted. Whilst the paper is held
in this position the flap B with the portion of the paper which encloses it is
turned back flat against the body of the bag so that the flap is now in the position
shewn by Fig. 1 the paper being folded under the flap B and also round the
inclined sides 61 62 thereof and also round the inclined sides a¹ a² of the plate
so that the bag now has the form represented by Fig. 3. After the edge c¹ has
been pasted the corner piece c² is folded down over the side of the plate A

page_text: and the opposite corner piece is folded down over the side 63 of the flap B,
that is along the dotted lines of Fig. 3, and the corner pieces are pasted
flat against the bottom of the bag as shewn in Fig. 4. The flap B with the paper
which encloses it is now turned up on the hinge d flat against the upper part of
the plate A thereby folding the bottom of the bag on the line X X and now the
plate A with its flap B can be withdrawn leaving the bag finished.
The combined plate and flap represented by Fig. 1 are suitable for making
paper bags of which the bottom is a perfect square but it will be evident that
when the bottom is to be oblong the side as of the plate and the side 63 of the
flap must be made proportionately longer to correspond with the bag required.
Dated this 5th day of November 1898.
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.
COMPLETE SPECIFICATION.
An Improved Combined Plate and Flap for Use in the Manufacture of
Paper Bags.
We, JAMES BOOTH, of Charlotte Street, in the City of Birmingham, Printer,
and FREDERICK BARTON CROWTHER, of 230, Lozells Road, Birmingham, aforesaid,
Printers Manager, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This invention consists of the herein described improved combined plate and
flap for use in the manufacture of paper bags by which the paper to form the bag
can be completely folded and pasted and the bag finished by an inexperienced
person before the plate is removed from the bag thereby effecting a considerable
saving in time over making bags on the ordinary combined plate and flap, from
which the partly finished bag has to be removed before the folding down and
pasting of the two bottom corners, which has to be performed (after the plate
and flap are removed) as a separate operation requiring considerable skill on
the part of the operator to fold the two corners down the right amount and
parallel with each other.
We will describe this invention by referring to the accompanying drawings
on which Fig. 1 is a front view of our improved combined plate and flap for use
in making square bottomed paper bags; Fig. 2 is a side view of the same;
Fig. 3 shews the said combined plate and flap with the flap turned up; Fig. 4
is a side view of Fig. 3; Fig. 5 shews the combined plate and flap laid on a sheet
of paper from which the bag is to be formed; and Figs. 6, 7, 8, 9 and 10 shew
successive stages in the formation of the bag which is of the usual kind and
illustrate how our improved combined plate and flap are used; Fig. 11 shews
our improved combined flap and plate for making oblong shaped bottom bags
and Fig. 12 is a side view of the plate illustrated by Fig. 11.
The same letters of reference indicate the same or corresponding parts in all
the figures.
Referring firstly more particularly to Figs. 1 to 10 both inclusive, in carrying
out this invention we take a plate A of the usual shape shewn by Figs. 1 and 3,
that is to say, the end portion of the plate above the line X X of Figs. 1 and 3
has the shape of one half of the bottom of the bag when folded, the sides a¹ a²
of the plate being each inclined at an angle of 45° with the line X X and the
side a³ of the plate being parallel with the line X X. This line X X is at right

page_text: angles with the parallel edges at a5 of the plate. Hinged to this plate A at d
on the line XX we provide a flap B which corresponds in shape to one half of
the bottom of the finished bag when folded and with the part of the plate A
which is above the line X X, that is to say, the two inclined sides 61 b³ of the
flap B correspond respectively with the two inclined sides a¹ a² of the plate A
and the third side 63 of the Hap B corresponds with the side a³ of the plate A.
In using our said improved combined plate and flap, the flap B is first turned
up flat against the plate as represented in Fig. 3, 4 and 5 and the plate and flap
are laid flap downwards on the sheet of paper C (as represented in Fig. 5) the
sides of which having been previously pasted are then folded over the sides of
the plate A as represented in Fig. 6 and stuck together. Whilst the paper is
held in this position represented by Fig. 6 the operators finger is inserted in the
opened end of the bag and the flap B and the portion of the paper which encloses
it are then turned flat against the body of the bag as represented in Fig. 8 so
that the flap B is now in the position shewn by Figs. 1 and 2 the paper being
folded under the flap B and also round the inclined sides a a² of the plate so
that the bag now has the form represented by Fig. 8. Fig. 7 shews the plate
and bag as the flap B is being turned from the position represented in Fig. 6 to
that represented in Fig. S. After the edge c¹ has been stuck down, the corner
piece is folded over the side a³ of the plate and the opposite corner piece c³ is
folded down over the side 3 of the flap B that is along the dotted lines c4 c5 of
Fig. 8 and the corner pieces 23 are pasted flat against the bottom of the bag
as shewn in Fig. 9. The flap B with the paper which encloses it is now turned
up on the hinged flat against the upper part of the plate A as shewn in Fig. 10
thereby folding the bottom of the bag on the line X X and now the plate A
with its flap B can be withdrawn leaving the bag finished.
The combined plate and flap represented in Figs. 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10
is suitable for making paper bags of which the bottom is a perfect square as
it will be understood that the distance from the side a³ of the plate to the side b³
of the flap in Figure 1 has to be equal to the length of the side a³. It will
however be evident that when the bottom of the bag is to be oblong the side a³
of the plate and the side 3 of the flap must be made proportionately longer as
for instance as shewn by Fig. 11 so as to correspond with the shape of the bottom
of the required bag.
It will be seen that by using this invention any inexperienced person can
readily make the bags as the side a³ of the plate and the side 63 of the flap ensure
the corner pieces being properly folded down true and square with each
other, which can only be done after considerable practice when making the bags
without our improved combined plate and flap.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
The herein described improved combined plate and flap, for use in the manu-
facture of paper bags, consisting of the plate A and flap B hinged and combined
together and made of the shapes substantially as described and illustrated so as
to enable the corners of the bottom of the bag to be properly folded down and the
bag finished before the plate and flap are removed therefrom.
Dated this 27th day of July 1890
CHARLES BOSWORTH KETLEY,
Agent for the Applicants.