Improvements in the Method of and Apparatus employed for Setting Hard Bodies in the Working Surface of Cutting Tools.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in the Method of and Apparatus employed for
Setting Hard Bodies in the Working Surface of Cutting Tools.
I, WALTER BRIERLEY of Penny Bank Chambers, Halifax in the County of
York, Patent Agent do hereby declare the nature of this invention which has
been communicated to me from abroad by Robert Lorcke, Fritz Kegel and
Max Clausnitzer all of Breslau, in the Empire of Germany and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
This invention relates to an improved process of and apparatus employed for
setting hard bodies in the working surface of cutting tools and the object of the
improvements being to insure a durable and reliable setting of such hard bodies
upon tools.
As is well known the working-surfaces of drilling and cutting tools are provided
with suitable hard bodies especially with diamonds mounted in such a manner that.
these bodies are either in direct connection with the tool, or are attached thereto
by means of separate bearers into which the diamonds are previously fixed.
Numerous endeavours have been made to fix diamonds into metal, these endeavours
have however not been attended by practical success. As the drilling and cutting
surfaces of the tools have to overcome great resistances, the setting or fixing
of the diamonds in the metal of the tool or the bearer must be effected in a very
firm and durable manner or by reason of the great strain and wear the diamonds
will break out after a short use of the tools. .
The object of this invention, as already stated, is to obviate these advantages
and to make the setting or fixing of diamonds or other hard bodies durable and
reliable.
This object is attained by means of the following process, for carrying into effect
of which there are used the means illustrated in the accompanying sheet of
drawings, in which :-
Fig. 1 is a vertical section of a bearer for a diamond:
Fig. 2 is a vertical section of a matrice for compressing the metal around the
diamond inserted in the bearer.
Fig. 3 is a vertical section of the matrice showing the bearer after its com-
pression and beginning to leave the recess of the matrice.
Fig. 4 is a side elevation (partly in section) of a complete bearer with a diamond
fixed thereto.
Fig. 5 is a bottom of the matrice.
Fig. 6 is a vertical section and
Fig. 7 a plan of a device for inserting the small body or diamond into the hole
of the bearer.
Fig. 8 is a similar vertical section showing this device in use.
Similar letters refer to similar parts throughout the several views.
According to the method illustrated in the figures the hard body "a," diamond
or the like, is inserted into a channel or hole "g" of the bearer 9 as shown in
Fig. 1 and the latter put into the recess i of a suitable block i. After the bearer g
has been heated to red heat and the diamond inserted, a matrice k, provided with
a conical shaped recess k is pressed over the bearer g with considerable pressure,
so that the said bearer assumes also a conical form and the metal is firmly pressed
around the body a. The body or diamond a is thus enclosed by the metal and in
such direct contact with the same as if diamond and metal were grown together.
In order to prevent the bearer g from sticking fast in the recesses of the
matrice k there is provided at the bottom of the said recess a channel or hole k³.

page_text: This hole is to be filled up with tallow or other easily dissolving or melting
substance, which will form vapour by the action of the heat, produced by pressing
the matrice k over the heated bearer g. This vapour or steam automatically tends
to force the bearer 9 out of the recess g¹ as soon as the matrice k is lifted or taken
off the block i. It is now only necessary to grind off the metal covering the
diamond point, and in this manner to expose the latter (see Fig. 4).
The bearers are attached to the cutting tools by pressing the bearers into
suitable recesses provided in the working surfaces of such tools.
66 ,,
The inserting of the body a into the bearings g can be effected in different
ways. A peculiar contrivance for it is shown in Figs. 6-8.
The small body a is put between the checks bb, mounted in dovetail grooves
of the frame c and adapted to slide towards each other by means of a screw spindle d.
The frame c is then to be placed in the block or cylinder e, carried or suspended
by springs, so that the body a is below and linable with a central channel e in the
block e.
After this the bearer g to be furnished with the body a is brought under
the block e so that the recess g¹ of the bearer 9 and the channel e¹ of the block e
will be exactly lineable with each other (see Fig. 6). By moving downwards the
bar or die h (adapted to slide in the central perforation or channel e¹ of the
block e) the body a will be forced out of the cheeks and moved into the hole g¹
of the bearer (see Fig. 8). The actual setting of the body "a" in the bearer is
then effected in the manner herein before described.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. An improved process of setting hard bodies in the working surfaces of
drilling or cutting tools consisting in compressing the metal of the bearers g.
carrying the hard bodies, from all sides around the said bodies by means of a
matrice k, the conical shaped cavity or recess of which terminates in a hole or
channel k, filled with an easily dissolving or melting substance forming vapour-by
the action of the heat produced by pressing the matrice over the bearer, which
vapour by means of its expansive force will drive or force the bearer out of the
matrice as soon as the pressure upon the latter ceases.
2. A device for inserting a diamond or other hard body into a bearer before its
compression consisting of a holder or frame c d, carrying the hard body between
its cheeks bb, a block e and a pressing bar or die h, by the downward movement of
which the body will be pressed out of the cheeks and into the hole of the bearer
placed exactly below the die.
Dated this 16th day of August 1892.
WALTER BRIERLEY.