IMPROVEMENTS IN THE MANUFACTURE OF CERTAIN PARTS OF BROOCHES, LOCKETS, AND OTHER ARTICLES OF JEWELLERY, AND IN TOOLS TO BE USED IN THE SAID MANUFACTURE
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Joseph Walker at the Office of the
Commissioners of Patents on the 18th March 1880.
JOSEPH WALKER, of Birmingham, in the County of Warwick, Die Sinker and
Tool Maker. "IMPROVEMENTS IN THE MANUFACTURE OF CERTAIN PARTS OF
BROOCHES, LOCKETS, AND OTHER ARTICLES OF JEWELLERY, AND IN TOOLS TO BE
USED IN THE SAID MANUFACTURE."
My Invention relates to the metallic parts of the portrait or other boxes of
brooches, lockets, and other articles of jewellery, and my said Invention consists of
the process or combination of processes, and the tools herein after.described to be
used in the manufacture of the said portrait or other boxes.
The said portrait or other boxes consist of tube like rings having at one end a
flange or rim extending both within and without the ring. Against the internal
flange or rim the portrait and glass are held, and the external flange or rim serves
as a stop to fix the position of the box in the brooch or article, and also to prize or
raise by means of the finger nail or otherwise the box out of the recess in the
brooch or article. In the ordinary manufacture the tube like ring and the flanges
or rims are made separately and soldered together.
According to my Invention I make the tube like ring and the flanges of the
box from one piece of sheet metal in the following manner, and by the use of the
tools herein described.
I will describe my method of manufacture in conjunction with the tools, which
constitute part of my Invention. I take a circular disc of sheet metal, and by
means of a raising or shaping process, effected in dies in the usual way, I raise or
shape the said disc into a shallow metallic cup having a slightly convex bottom.
I next pierce out nearly the whole of the bottom of the cup, thereby forming a
tubular ring having at one end an internal flange or rim. I next form on the
partly made box the external flange or rim, and reduce the length of the tubular
ring by the use of a pair of tools worked in a press constructed as follows:-
=
The lower or fixed tool consists of a block or body having in its axis a cylindrical
hole-for-receiving a-cylindrical peg capable of being lifted out of the body by a
peg has
lever or spring for removing the finished article from it. The head of the
made upon it two step like annular shoulders. These shoulders are of different
breadths, the upper one having a breadth equal to that of the internal flange or

page_text: rim of the box, and the lower shoulder being narrower, and having a breadth
proper to receive the lower edge of the tubular ring of the box, the two shoulders
being at a distance apart equal to the distance between the lower edge of the
tubular ring, and the flanges of the finished box. When the peg is placed in the
hole in the body of the tool the upper step like shoulder is on a level with the
bottom of the recess in the top of the body, and an annular space is left between
the peg and tool for receiving the tubular ring of the partly made box. The punch
or upper tool has a shape proper to pass onto the cylindrical peg above the top
step like shoulder, the acting or shaping face of the said punch having a circular
depression in it around that part which passes onto the peg.
In using the pair of tools the partly made box is placed on the peg in the lower
tool, the bottom of the tubular ring of the box resting on the narrow bottom
shoulder, and being confined between the peg and body of the lower tool. The
internal flange or rim of the box is situated a short distance above the upper
shoulder on the peg. By the descent of the punch the internal flange or rim is
flattened and expanded, and the metal of the top of the tubular ring is compressed
or folded upon the upper shoulder of the peg. The length of the tubular ring is
thereby reduced, and a narrow external flange or rim in the same plane as the
internal flange is formed at the upper end of the box. The tubular ring or body
of the box together with its external and internal flanges or rims are thus made
from one piece of sheet metal. My Invention is applicable to elliptical and other
shaped boxes as well as to circular boxes.