Improvements in the Construction of Sheet-metal Hollow-ware.
Year: 1888

page_text: Date of Application, 24th Sept., 1888
Complete Specification Left. 24th June, 1889-Accepted, 27th July, 1889
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Sheet-metal Hollow-ware.
I, JAMES LISTER WALKER, of 409, Bowling Back Lane, Bradford, in the County
of York, Tin and Iron Plate Worker, do hereby declare the nature of this invention
to be as follows:-
:-
This invention relates to improvements in sheet-metal hollow-ware and particularly
to comparatively deep rectangular articles or approximately rectangular articles, such
as loaf tins, boxes, cases and other similarly shaped articles. And the object of the
invention is to economise labor and produce a stouter and cheaper article by forming
such articles of one pieco of sheet metal in the manner hereinafter described.
The said improvements consist in so blocking the said articles by means of suitably
formed dies that the superfluous metal is bent or lapped into the form of a cap to
strengthen or stiffen and protect each corner of the article.
To carry out my invention I use two sets of dies so constructed and applied that the
first set approximately bends the sheet metal to the shape of the article to be produced
but leaving the superfluous metal at the corners somewhat in the form of a sharp
pyramid having four sides and the apex downwards. The second set of dies are then
applied to perfect the shape of the article and by pressing the sides of the said
pyramidically shaped portions together and against the sides of the article, they form
a double cap on each corner which besides strengthening and stiffening such articlo
neatly disposes of the superfluous metal.
When the said articles are to be wired ronnd the rim, _ shaped pieces are cut from
each corner of the flat sheet before it is pressed.
Dated this 22nd day of September 1888.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in the Construction of Sheet-metal Hollow-ware.
I, JAMES LISTER WALKER, of 409, Bowling Back Lane, Bradford in the County
of York, Tin and Iron Plate Worker, 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 relates to improvement in sheet-metal hollow-ware and particularly
to comparatively deep rectangular articles or approximately rectangular articles such
as loaf tins, boxes cases and other similarly shaped articles. And the object, of the
invention is to economise labor and produce a stouter and cheaper article by forming
such articles of one piece of sheet-metal in the manner hereinafter described.
The said invention consists in so blocking the said articles by means of suitably
formed dies that the superfluous metal is bent or lapped into the form of a cap to
strengthen or stiffen and protect each corner of the article.
To carry out my invention I use two sets of dies so constructed and applied that
the first set approximately bends the sheet metal to the shape of the article to be
produced by leaving the superfluous metal at the corners somewhat in the form of a
sharp pyramid having four sides and the apex downwards. The second set of dies are
then applied to perfect the shape of the article and by pressing the sides of the said
pyramidically shaped portions together and against the sides of the article, they form
a double cap on each corner which besides strengthening and stiffening such article
neatly disposes of the superfluous metal.

page_text: In order to fully describe my invention I have appended a sheet of drawings
illustrating a loaf tin in various stages of construction in accordance with my
improvements.
Figure 1, represents a sheet of tin with the corners removed to facilitate wiring the
finished article round the top.
Figure 2 is an end view, and Figure 3 is a plan of such sheet after it has passed
through the first pair of dies of an ordinary drop press. The said dies are adapted to
partly bend up the sides A and ends B and dispose the metal at the corners C in the
form shown.
Figure 4, is a perspective view of the tin after it has passed through the second
pair of dies. which are constructed to further bend up the ends and sides until their
edges D (Figures 2 and 3) touch, and fold the sides E, E, and H, H, of each corner
.against each other thus forming a double cap F which before leaving the dies is
pressed closely against the corners of the tin.
Figure 5, is a perspective view of the loaf tin after it is wired round the rim J in
the ordinary manner.
It is obvious that hollow-ware with more than four sides may be made in the above
described manner by regulating the amount of metal disposed at each angle in
accordance with the number of sides.
Having now particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be performed, I declare that what I
claim is :
The improved construction of hollow-ware formed of one piece of sheet metal in
which the superfluous metal is folded and pressed in the form of a cap outside each
angle, substantially as herein shown and described and illustrated in the accompanying
drawing.
Dated this 21st day of June 1889
DRACUP & NOWELL,
Bradford, Agents.