AN IMPROVED METHOD OF SETTING DIAMONDS IN DRILLS AND OTHER BORING AND CUTTING TOOLS
Year: 1874

page_text: LETTERS PATENT to Charles Andrew Terrey, of St. George's Road,
Southwark, in the County of Surrey, Engineer, for the Invention
of AN IMPROVED METHOD OF SETTING DIAMONDS IN DRILLS AND OTHER
BORING AND CUTTING TOOLS."
Sealed the 19th June 1874, and dated the 14th February 1874.
PROVISIONAL SPECIFICATION left by the said Charles Andrew
Terrey at the Office of the Commissioners of Patents, with his
Petition, on the 14th February 1874.
I, CHARLES ANDREW TERREY, of St. George's Road, Southwark, in
the County of Surrey, Engineer, do hereby declare the nature of the
said Invention for "AN IMPROVED METHOD OF SETTING DIAMONDS IN DRILLS
AND OTHER BORING AND CUTTING TOOLS," to be as follows:-
The ordinary method of setting diamonds or carbon in mining drills is
firstly to bore, punch, or otherwise form a hole from the exterior or
outer surface of the drill, then to introduce the diamond also from the
exterior, securing it in this seat by bringing back some portion of

page_text: socket.
This method of setting diamonds from the exterior has many
defects, amongst others that on the attrition of the debris (in rock boring
for example), causing a loosening of the diamond in its socket, it is
liable to come out through the opening by which it was inserted, and
thereby cause considerable injury to the other parts of the drill before
the working can be arrested. Further, the resetting of another diamond
in this manner occupies considerable time, and the substituted diamond
must necessarily be larger than the one it replaces, as the size of the
socket will have been increased by the friction or cutting of the loose
diamond in escaping therefrom.
I propose to obviate these and other defects inherent to the present
methods by adopting the following:-I make the drill, whether a solid
conical drill or a drill of any other kind, with a cap or cover following
exactly the form of the solid part of the drill. This cap or cover may
be of one piece or in several sections, and may dovetail into and be
secured by screws or otherwise to the body of the drill. This cap or
cover will be pierced with orifices, decreasing in diameter from the inner
to the outer surface, wherever it is desired to place a diamond. The
diamond or diamonds will be laid in the orifices of the cap or cover or
of any section thereof, the cap will then be placed upon the solid body
of the drill, and be screwed or otherwise tightened upon it, so that the
solid body will form the base of the setting of the diamond, which
I may further secure from movement within its socket by any suitable
cements, or any of the ordinary means used for this purpose.
It will be evident that the diameter of the diamond at some point
within the socket being greater than that of the mouth of the orifice by
the inner side of which it has been inserted it cannot work out, and that
should it be broken and thereby leave its socket it may be replaced with
ease, and with a diamond of the same size by simply unscrewing that
section of the cap from which it has escaped and replacing it.
I propose to apply this method of setting the diamonds not only to
mining drills but also to diamond saws, and any other cutting or boring
tools to which it may be found applicable.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Charles Andrew Terrey in the Great Seal Patent
Office on the 12th August 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
ANDREW TERREY, of St. George's Road, Southwark, in the County of
Surrey, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of February, in the
year of our Lord One thousand eight hundred and seventy-four, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Charles Andrew Terrey,
Her special licence that I, the said Charles Andrew Terrey, my exe-
cutors, administrators, and assigns, or such others as I, the said Charles
Andrew Terrey, my executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully
might make, use, exercise, and vend, within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "AN IMPROVED METHOD OF SETTING DIAMONDS IN DRILLS AND
OTHER BORING AND CUTTING TOOLS," upon the condition (amongst others)
that I, the said Charles Andrew Terrey, my executors or admi-
nistrators, by an instrument in writing under my, or their, or one
of their hands and scals, should particularly describo and ascertain
the nature of the said Invention, and in what manner the same was to
be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date of
the said Letters Patent.
NOW KNOW YE, that I, the said Charles Andrew Terrey, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and

page_text: outer metallic surface on to the diamond or carbon to grip it in the
socket.
This method of setting diamonds from the exterior has many defects,
amongst others that on the attrition of the debris (in rock boring for
example), causing a loosening of the diamond in its socket, it is liable
to come out through the opening by which it was inserted, and thereby
cause considerable injury to the other parts of the drill before the
working can be arrested. Further, the resetting of another diamond in
this manner occupies considerable time, and the substituted diamond
must necessarily be larger than the one it replaces, as the size of the 1
socket will have been increased by the friction or cutting of the loose
diamond in escaping therefrom.
I obviate these and other defects inherent to the present methods by
adopting the following :—I make the drill, whether a solid conical drill
or a drill of any other kind, with a cap or cover following exactly the 1
form of the solid part of the drill. This cap or cover may be of one
|piece or in several sections, and may dovetail into and be secured by
screws or otherwise to the body of the drill. This cap or cover will be
pierced with orifices, decreasing in diameter from the inner to the outer
surface, wherever it is desired to place a diamond. The diamond or
diamonds will be laid in the orifices of the cap or cover or of any section
thercof, the cap or section will then be placed upon the solid body of the
drill and be secured or otherwise tightened upon it, so that the solid
body will form the base of the setting of the diamond, which I may
further secure from movement within its socket by any suitable cements, 1
or any of the ordinary means used for this purpose.
It will be evident that the diameter of the diamond at some point
within the socket being greater than that of the mouth of the orifice by
the inner side of which it has been inserted it cannot work out, and that
should it be broken and thereby leave its socket it may be replaced with
ease and with a diamond of the same size by simply unscrewing that
section of the cap from which it has escaped and replacing it.
On the accompanying Sheet of Drawing forming part of this
Specification Fig. 1 represents a side view or elevation of a solid drill
embodying my Invention, Fig. 2 being a plan, and Fig. 3 a sectional
| plan of same. A indicates the drill; B, the cap; C, D, E, moveable

page_text: sections or side picces screwed on to A; f, f, orifices for water;
a, a, diamonds.
Fig. 4 is a section of a hollow or tubular drill also embodying my
Invention, Fig. 5 being a plan, and Fig. 6 a plan with portion of cap
removed. A is the drill; B, the cap; a, a, diamonds.
I apply this method of setting diamonds not only to mining drills
but also to diamond saws, and any other cutting or boring tools to which
it may be found applicable.
Fig. 7 is a sectional elevation of a portion of a diamond saw embodying
my Invention, and Fig. 8 a plan of same. A indicates the saw;
B, B, moveable caps for carrying diamonds; b, b, openings for forcing
out capes; a, a, diamonds.
Having now described and ascertained the nature of my said Invention,
and in what manner the same is or may be performed, I desire it to be
understood that the drill and drill cap may be made of any suitable metal
or material which may be found suitable for such purpose, and of forms
and dimensions suited to the circumstances of each particular case, that
I make the cap in any number of sections, dovetailing or fitting them to
each other, and to the body of the drill in such manner as in practice
shall be found most convenient and efficient; nor do I confine myself
to the precise form of cap shown at Figs. 7 and 8 for diamond saws,
such being merely given as an illustration of such application of my
principle of setting diamonds or carbon, and that I claim as secured to
me by the herein-before in part recited Letters Patent, the use of a cap
in one or more sections for holding diamonds or carbon on drills of any
kind on saws, and other boring and cutting tools, substantially as herein-
before specified.
In witness whereof, I, the said Charles Andrew Terrey, have here-
unto set my hand and seal, this Tenth day of August, in
the year of our Lord One thousand eight hundred and seventy-
CHARLES ANDREW TERREY. (L.S.)