Improvements in Apparatus for and the Manufacture of Metal Box Covers or Lids, Pans, and other analogous Articles.
Year: 1896

page_text: Date of Application, 14th Feb., 1896-Accepted, 21st Mar., 1896
COMPLETE SPECIFICATION.
Improvements in Apparatus for and the Manufacture of Metal Box
Covers or Lids, Pans, and other analogous Articles.
I, JOHN THOMSON PAUL of Grove Works, Brandfield Street, Edinburgh, in
the County of Midlothian, North Britain, Manufacturer 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 :-
The object of my invention is to provide an apparatus for facilitating and
expediting the manufacture of metal covers or lids, pans or other analogous
articles of a square, rectangular or other convenient shape with turned up edges
or flanges, the said covers or lids, pans or other articles having the corners so
formed by the overlapping or folding of the metal without notching the sheet, that
they are made air-tight without any soldering.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended an explanatory sheet of drawings in the several
figures of which, corresponding parts are marked with the same letters of
reference.
Figure 1 is a plan of the bottom die or block.
Figure 2 is a section of the same on the line A. B.
Figure 3 is a section of the same on the line C. D.
Figure 4 is a plan of section C, (a and b being removed) showing the recess to
clear the folded corner.
Figure 5 is a plan of the male die or punch.
Figure 6 is an elevation of the same.
Figure 7 is an edge view of a cover or lid, showing the corners finished by my
invention.
Figure 8 is a plan of the same.
In carrying out my invention I have a bottom die or block of square, rectangular
or other convenient shape built up in four sections a, b, c, d, each section being
made in one or more parts as will be found most convenient for the building of the
block. At each of the corners of said block in the section b there is a recess h
made of such shape that the top forms a square with the inner corner cut away,
the recess being tapered downwards in such manner that when it reaches the
bottom edge of section b, it runs into the square recess in the corner of section c
as shown in Figures 3 and 4. The section a is fixed on three sides of the block
and guides the tin or other metal plate into position in the die before the operation
of drawing. The section d is a foundation piece to which the other sections are
fixed by bolts e or other suitable means. The male die or punch f is a block of
metal of square, rectangular, or other convenient shape, with a spindle y to enable
the said block to be attached to a suitable drawing mechanism, the said block also
having steel pieces k inserted at the corners.
The operation of forming the covers or lids, pans or other article, is as follows:-
The sheet of tin or other metal being cut to the required size is placed into the
recess in the block formed by the three sides of the section a, the punch f is then
allowed to fall, and striking the metal sheet (shown by dotted lines in position in
block Figure 2) forces it downwards through the sections b and c. As the sheet
of metal is forced downwards the edges on entering section bare turned upwards
nd the corners being forced into the little square recesses are caused to fold
hemselves in such manner that as they pass through they are gradually drawn

page_text: into the form and are folded round the edge of the cover, lid or pan in the manner
shown in Figures 7 and 8. The section d is made large enough to allow the covers
or lids, pans or other articles to fall freely through after being drawn. The cover
or lid, pan or other article is thus formed of one piece and the corners are
strengthened and made perfectly air-tight without the use of solder and the whole
is done at one operation. After the covers or lids, paus or other articles are taken
from the drawing machine they are trimmed at the corners and finished by suitable
mechanism.
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 :-
1. In apparatus for drawing or shaping metal covers or lids, pans or other
analogous articles, the combination of a block or die with a punch, the said block
or die having recesses at the corners to form or fold the corners of the covers or
lids, or pans, substantially as described and illustrated on the accompanying sheet of
drawings.
2. The method of manufacturing covers or lids, pans or other analogous articles,
substantially as and for the purposes hereinbefore described and illustrated on the
accompanying sheet of drawings.
Dated this 13th day of February 1896.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.