IMPROVE- MENTS IN ROCK DRILLING OR BORING MACHINERY."
Year: 1875

page_text: LETTERS PATENT to Charles Andrew Terrey, of St. George's Road,
Southwark, in the County of Surrey, for the Invention of "IMPROVE-
MENTS IN ROCK DRILLING OR BORING MACHINERY."
PROVISIONAL SPECIFICATION left by the said Charles Andrew
Terrey at the Office of the Commissioners of Patents, with his
Petition, on the 23rd September 1875.
I, CHARLES ANDREW TERREY, of St. George's Road, Southwark, in
3 the County of Surrey, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN ROCK DRILLING OR BORING MACHINERY,"
to be as follows:-
My Invention relates to improvements in rock drilling or boring
machines, whereby they are adapted for drilling or boring at any desired
angle with greater facility than ordinary rock drilling or boring
machines.
. My improved machine is composed of a bogie or truck, on to which
I secure any suitable motive-power engine in connection with a crank

page_text: shaft, on one end of which is a toothed wheel for driving the boring or
drilling machinery, and which also carries an eccentric for working a
force pump. Vertical guides or standards are secured on the bogie, and
a table carrying a sliding saddle works up through these guides. The
boring bar is supported on the saddle with one of its ends working in a t
screw nut, and the other through a bevil toothed wheel and frictional
A vertical
wheel or cone, gearing with a cone on a countershaft.
shaft conveys motion from the crank shaft to a cross shaft, and thereby
to the boring bar. The table with its sliding saddle and boring bar is
raised and lowered by the aid of a vertical screw shaft. I may place
more than one table to move up and down in the vertical guides, and
more than one saddle and boring bar upon each table.
The action is as follows:-The boring bar being made to revolve
traverses in the direction of its length or axis actuated by the friction
of the cones pressed against each other by the aid of a spring within the
cone on the countershaft.
The driving cone attached to the bevil wheel feathered to the boring
bar is of a larger diameter than the cone on the countershaft, (this
diameter being regulated by the feed required) and drives this latter
at a speed somewhat greater than that of the boring bar, which gives
the feed nut (geared by two toothed wheels. of the same size, one on
the countershaft and the other on the feed nut) one quarter turn, more
or less, at the will of the operator. Should this feed be found excessive
in boring through different strata, my multiple friction gear will of
itself moderate the feed accordingly. Thus, the boring bar finding the
feed excessive will cause the feed nut to tighten in its bearing, which
friction immediately travels to the friction cones, overcoming them, and
allowing the drill either to recede or to travel at slower feed till it
cuts away and overcomes its obstacle.
To withdraw the boring bar the conc on the countershaft is elevated
by the screw shaft, which hold the countershaft and feed nut stationary,
while the same motion causes the boring bar to recedo.

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 21st March 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
ANDREW TERREY, of St. George's Road, Southwark, in the County of
Surrey, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-third day of September, in
the year of our Lord One thousand eight hundred and seventy-five, in
the thirty-ninth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Charles Andrew Terry,
Her special licence, that I, the said Charles Andrew Terrey, my
executors, 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 "INPROVEMENTS IN ROCK DRILLING OR BORING
MACHINERY," upon the condition (amongst others) that I, the said
Charles Audrew Terrcy, my executors or administrators, by an
instrument in writing under my, or their, or one of their hands
and seals, should particularly describe 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, tho 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 by the following statement :-
-
My Invention relates to improvements in rock' drilling or boring

page_text: 1, screw shaft, by means of which the frictional wheel K is thrown
out of gear with the wheel L.
M, vertical shaft, whereby motion is conveyed from the crank shaft B
to cross shaft N and boring bar G.
N, cross shaft.
O, screw shaft, for raising and lowering the table D and bar G.
i, k, l, wheels for turning said shaft; m, m, nuts by aid of which
boring bar is adjusted.
'P, toothed wheel, to which is attached the screw nut g for boring
bar G to work through.
.
Q, toothed wheel in gear with P, and screwed on to countershaft H.
R, screw stud, and S, slotted plate, for adjusting boring bar to any
suitable angle, and secured on to countershaft H.
The action is as follows:-On the boring bar G being made to revolve
it traverses in the direction of its length or axis, actuated by the friction
of the cones K, L, pressed against each other by the aid of a spring
within the cone K on the countershaft H.
g
The driving conė L, attached to the bevil wheel f, feathered to
the boring bar G, is of a larger diameter than the cone K on the counter-
shaft H (this diameter being regulated by the feed required), and drives
the cone K at a speed somewhat greater than that of the boring bar G,
which gives the feed nut 9 (geared by two toothed wheels P, Q, one on
the countershaft H, and the other on the feed nut g) one quarter turn
more or less at the will of the operator. Should this feed be found
excessive in boring through different strata, my multiple friction gear.
will of itself moderate the feed accordingly. Thus, the boring bar G
finding the feed excessive will cause the feed nut g to tighten in its
bearing, which friction immediately travels to the friction cones K, L,
overcoming them and allowing the drill either to recede or to travel at
a slower feed, till it cuts away and overcomes its obstacle.
To withdraw the boring bar the cone on the countershaft is elevated
by the screw shaft I, which hold the countershaft H and feed nut g
stationary, while the same motion causes the boring bar G to recede.
"
It will be seen that owing to the frictional cone K being brought to
bear
upon the cone L by the pressure of a spring only, any obstacle to
the advance of the boring bar G, or neglect on the part of the attendant

page_text: will be provided for, since the two cones K, L, would slide one upon
another, thus stopping the further advance of the bar G. By turning
the screw shaft O (by means of the hand wheel i and wheels k, l,) the
table D, saddlo E, and boring bar G, can be adjusted to any suitable
height, and by means of the screw stud R and slotted plate S to any 5
suitable angle, also by releasing the nuts m, m, to any required position
in a horizontal direction.
I may place more than one saddle carrying table D to move up and
down in the vertical guides C, C, and I may place more than one
saddle E with boring bar G upon each table D, working them in the 1
same manner as for the single boring bar above described.
Having now described and ascertained the nature of my said
Invention, and in what manner the same is or may be performed, I
would have it understood that I do not confine myself to the precise
details herein-before described and shown on the accompanying Sheet 1
of Drawing, as such may be varied while retaining the essential features
of my Invention, neither do I limit myself to any precise dimensions of
parts in their relation to each other, or to the use of any particular
motive power for driving my improved rock drilling or boring machinery,
and that I claim as of my Invention, and secured to me by the herein- 2
before in part recited Letters Patent,―
Firstly. The combination in a rock drilling or boring machine, sub-
stantially as described, of apparatus whereby the drilling or boring may
be performed at any desired angle, without shifting the position of the
machine.
Secondly. The combination in rock drilling or boring machines of
multiplying frictional feed gear, substantially as described.
2
In witness whereof, I, the said Charles Andrew Terrey, have
hereunto set my hand and seal, this Twenty-first day of March,
in the year of our Lord One thousand eight hundred and 3