Improvements in the Manufacture of Diamond-tools for Outting Precious Stones.
Year: 1889

page_text: Date of Application, 1st Nov., 1889
Complete Specification Left, 22nd July, 1890-Accepted, 23rd Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Diamond-tools for Outting
Precious Stones.
I, GUSTAVE FRÉDÉRIC KOHLER, of 23, Boulevard de Strasbourg, Paris, in the
Republic of France, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to the manufacture of diamond-tools for cutting precious
stones.
'
The means hitherto employed for setting diamonds in small rings of iron or steel
for the purpose of cutting and working precious stones are defective because of the
employment of copper for setting the diamond in an opening formed in the ring. It
frequently happens that, in working, the diamonds become detached and lost which
entails a loss of money and time for repairing the tool.
According to my invention these defects aro obviated; the diamond is set in a disc
and cannot become detached therefrom in consequence of it being enclosed between
two thicknesses of iron or steel soldered together while hot. A further advantage
resulting from this system is, that it, is a test, against which false diamonds are not
proof as they would become melted or fused.
In carrying out my invention I take a band or strip of metal, preferably iron or
steel, and one end of this strip is bent over so as to form two thicknesses of metal.
It is then heated and the diamond is placed in an opening between the two parts, the
metal being red hot. "The doubled-over part is then lightly struck with a hammer to
imbed the diamond in the two parts. The band or strip is then reheated and the
metal is allowed to liquate and the two parts are soldered together without it being
necessary to have recourse to any chemical product or to brazing. The diamond being
tlius fixed in the metal, between the two parts soldered together, the band or strip is
then cut through to detach the doubled-over piece which encloses the diamond near one
of its edges. The edge of the metal nearest the diamond is then filed away until the
diamond is reached; a circle is then marked enclosing the diamond and through the
line thus mado the metallic disc is cut out. The diamond is brought to view either on
the edge or on the face of the disc which is applied to the cutting tool, or it may be
on the angle between the edge and the face so as to provide a cutting edge in both
directions.
:
A somewhat less beneficial result can be obtained by pressing 'together the two
metal parts which enclose the diamond by means of rivets.
The discs provided with the diamonds are imbedded in openings formed in the
plates or tools for cutting or working precious stones.
Dated the 1st day of November 1889.
The
.G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Diamond-tools for Outting
Precious Stones.
I, GUSTAVE FREDERIC KOHLER, of 23, Boulevard de Strasbourg, Paris in the
Republic of France, Engineer, 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:-
My invention relates to the manufacture of diamond-tools for cutting precious

page_text: The means hitherto employed for setting or fixing diamonds in a small washer or
disc of iron or steel for cutting and working precious stones are defective because of
the employment of copper for holding the diamond in an opening formed in the
washer or disc. It frequently happens that, in working, the diamonds become
detached and lost, thereby entailing a loss of money and time for repairing the
tool.
According to my invention I obviate these defects by enclosing the diamond-
between two thicknesses of iron or steel welded together. A further advantage
resulting from this system is, that it is a test against which false diamonds are not
proof as they would become melted or fused.
In order to enable my invention to be fully understood I will proceed to describé
the same by reference to the accompanying drawing, the several figures of which
illustrate the various stages of manufacture of the diamond holder or disc the position
of the diamond in the disc and a number of discs mounted in the tool..
In carrying out my invention I take a band or strip A of metal; (preferably iron or
steel) as shown in figures 1 and 2 one end of which is bent over as shewn in figures 3
and 4. It is then heated and the diamond is placed in an opening a between the two
parts, the metal being at red heat. The doubled-over part is then lightly struck witli
a hammer to imbed the diamond in the two parts. The band or strip is then reheated
to welding heat and the two parts welded as shown in figures 5 and 6 without it being
necessary to have recourse to any chemical product or to brazing. The diamond
being thus fixed in the metal, the band or strip is cut through at a figure 6 to
detach the doubled-over piece shown in figure 7 which encloses the diamond near one
of its edges. The edge of the metal nearest the diamond is then filed away until the
diamond is reached; a circle shewn in dotted lines at figure 8 is then marked
enclosing the diamond and through the line thus made the metal disc is cut out. The
diamond can be exposed so as to project either on the periphery as shown in figure 9
or on the flat face as shown in figure 10 or at the angle as shown in figure 12.
A somewhat less beneficial result can be obtained by pressing together by means of
rivets the two metal parts which enclose the diamond.
The discs provided with the diamonds are imbedded in openings: formed in the
plates or tools for cutting or working precious stones..
:
;
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. The method of setting or fixing diamonds for cutting and working precious
stones consisting in embedding the diamond between two surfaces of iron or steel, the
whole being by preference welded together, substantially as described.
2. The manufacture and use of diamond-tools for cutting and working precious
stones, substantially as hereinbefore described and illustrated in the. accompanying
drawing.
1000
G., F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.