IMPROVEMENTS IN THE MANUFACTURE OF SHEET METAL BOXES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I THO ALLEN of Reading in the County of Berks, Mechanical Engineer,
do hereby declare the nature of my invention for "IMPROVEMENTS IN THE
MANUFACTURE OF SHEET METAL BOXES to be as follows:
"
The bottom and sides of the box are made from one sheet of metal. This sheet
is first dished at the centre so that the metal which will form the flat bottom of the
box is forced out of its original plane into a parallel plane but is still connected to
the undished part of the sheet by the metal which will form the rounded lower
parts of the sides of the box-V shaped pieces are then cut out at the corners of
the undished metal which is then bent up so as to form the remaining portions of
sides. The box is afterwards finished in the ordinary way.
CARPMAEL & Co.,
Agents for the Applicant.
J
I, THOMAS ALLEN of Reading in the County of Berks, Mechanical Engineer
do hereby declare the nature of my invention for "IMPROVEMENTS IN THE
MANUFACTURE OF SHEET METAL BOXES" and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
Statement:-
This invention has for its object improvements in the manufacture of sheet
metal boxes.
The bottom and sides of the box are made from one sheet of metal. This sheet
is first dished at the centre so that the metal which will form the flat bottom of the
box is forced out of its original plane into a parallel plane but is still connected to
the undished part of the sheet by the metal which will form the rounded lower
Prins 1

page_text: parts of the sides of the box. V shape pieces are then cut out at the corners of
the undished metal which is then bent up so as to form the remaining portions of
sides. The box is afterwards finished in the ordinary way.
In order that my said invention may be most fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
parts of the sides of the box. V shape pieces are then cut out at the corners of
the undished metal which is then bent up so as to form the remaining portions of
sides. The box is afterwards finished in the ordinary way.
In order that my said invention may be most fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan of a sheet of metal which has been dished by stamping
between dies in order to prepare it for forming the lower part of a sheet metal box.
Figure 2. is a longitudinal section of the dished sheet of metal represented by
Figure 1.
Figure 3 is a transverse section of the same.
Figure 4 is a front elevation of the finished box, and
Figure 5 is a transverse section of the same.
A is the cavity or recess formed in the sheet of metal which is intended to
constitute the lower part of the box. The sides of this cavity all around are curved
or rounded and they connect the central part of the bottom with the edges B, B,
of the plate exterior to the cavity. These edges remain flat with the exception of
their outer margins and these are somewhat bent or set inwards suitably to admit
of the lid of the box closing upon them, with the exterior of the box and lid
presenting a smooth and flush surface.
C, C, are the angles or corners which are cut out from the plate when dished in
the manner described and shown. After these pieces have been cut away the sides
or flaps B, B, are bent upwards so as to form enclosing sides around the cavity A,
these sides may be of any depth according to the capacity which it is desired to
give to the body of the box. E is the lid of the box, it is hinged to the lower part
at E¹, but the way of forming and applying the lid to the box is no part of my
invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
.
.
Forming the bottom and sides of the box from one sheet of metal by dishing the
centre portion of the sheet, cutting away pieces at the corners and turning up flaps
around the cavity or dished portion of the plate substantially as described.
Dated this 21st day of October 1884