Improvements in the Manufacture of Sheet Metal Stew-pans.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Sheet Metal Stew-pans.
We, S. J. AND E. FELLOWS, LIMITED, of Vulcan Works, Wolverhampton, in the
County of Stafford, Wrought Hollowware Manufacturers, and WALTER HENRY
CORKER, Managing Director of the said Company, do hereby declare the nature of
this invention to be as follows:-
Stew-pans as heretofore generally constructed are formed taper-sided owing to the
fact that such shape is necessary to enable them to be produced by the economical
process of stamping or stamping and spinning. Parallel-sided stew-pans are,
however, much preferred, as being more convenient in use, but heretofore they have
been much more expensive to manufacture than the taper-sided stew-pans, as the
cylindrical portions have each been formed by bending a piece of sheet metal into
shape and brazing together its adjacent edges, and the bottoms have each been
formed from a separate piece of sheet metal and brazed to the cylindrical portion.
Now, the object of this invention is to produce parallel-sided stew-pans, in a much
more economical manner than heretofore, and each in a single piece of sheet metal
without brazing; and this object is accomplished, according to this invention, by
raising the metal in a drawing-through press which comprises a lower die having
a hole therethrough of the diameter of the desired stew-pan, a pressure plate to
prevent the metal buckling as it is drawn towards the hole in the lower die, and a
forcing tool which carries the metal through the lower die in the form of a close-
bottomed cylinder.
Dalad thin 14h
100
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Sheet Metal Stew-pans.
We, S. J. AND E. FELLOWS, LIMITED, of Vulcan Works, Wolverhampton, in the
County of Stafford, Wrought Hollowware Manufacturers, and WALTER HENRY
CORKER, Managing Director of the said Company, 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:-
Stew-pans as heretofore generally constructed an formed taper-sided owing to
the fact that such shape is necessary to enable them to be produced by the economical
process of stamping or stamping and spinning. Parallel-sided stew-pans are, how-
ever, much preferred, as being more convenient in use, but heretofore they have been

page_text: much more expensive to manufacture than the taper-sided stew-pans, as the cylindri
cal portions have each been formed by bending a piece of sheet metal into shape and
brazing together its adjacent edges, and the bottoms have each been formed from
a separate piece of sheet metal and brazed to the cylindrical portion.
Now, the object of this invention is to produce parallel-sided stew-pans, in a much
more economical manner than heretofore, and each in a single piece of sheet metal
without brazing; and this object is accomplished, according to this invention, by
raising the metal for the body in a drawing-through press which comprises a bottom
tool having a hole therethrough of the diameter of the desired stew-pan; a pressure
plate to prevent the metal buckling as it is drawn towards the hole in the bottom
tool, and a forcing tool which carries the metal through the bottom tool in the form
of a close-bottomed cylinder.
In order that the invention may be clearly understood, we will proceed to describe
the same with reference to the accompanying drawings, of which Figure 1 is a
vertical section taken through the centre of the press tools, and shews the pressure
plate down upon the blank or disc of metal from which the stew-pan body is to be
formed, and the forcing tool in position to commence to operate upon the blank:
Figure 2 is a corresponding view to Figure 1, but shews the forcing tool to have
been moved down some distance below its position shewn by Figure 1, and a portion
of the metal of the blank to have been carried down into a close-ended cylindrical
shape and Figure 3 is a corresponding view to Figure 1, but shews the forcing tool
to have been moved to the bottom of its stroke, and the blank to have been thus
completely drawn through the working portion of the bottom tool, and entirely
into a close-ended cylindrical shape. In Figure 3 a portion of the bottom tool, and
also of the pressure plate, is shewn broken off at one side, for convenience of
illustration.
The sheet metal blank a, from which the stew-pan body is to be formed, is placed
upon the bottom tool A, and within a raised portion or fillete which surrounds the
upper working face of the tool and acts as a gauge for convenience in putting the
blank into place. The pressure-plate B is then brought down upon the blank for
the purpose of preventing it from buckling while it is being operated upon, and the
forcing tool C is then brought down upon the middle of the blank and forces the
blank through the working portion d of the bottom tool in the form of a close-
bottomed cylinder which is of the size and shape of the required stew-pan body.
For the purpose of ensuring that the cylinder a' shall not be drawn up again upon
the return stroke of the forcing tool, the lower portion of the opening through the
bottom tool is made somewhat larger than the upper portion, thus forming a
shoulder at the bottom of the working portion. Immediately the upper edge of
the body a passes below the working portion of the opening, and is thus relieved
of the sideway pressure, it expands slightly, and as the tool C rises again the upper
edge of the body comes against the shoulder and the body is thus forced off the
tool and drops clear of the bottom tool A.
The body a is, of course, trimmed around its upper edge.
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 whai
we claim is:-
In the manufacture of parallel-sided sheet metal stew-pans, raising the bodies
thereof in a drawing through press, substantially in the manner described.
Dated this 4th day of February 1898.
STEPHEN WATKINS,
Wolverhampton, Agent for the Applicants.