IMPROVEMENTS IN MACHINERY FOR DRILLING OR BORING, INTO STONE,
Year: 1855

page_text: LETTERS PATENT to Thomas Bartlett, C. E., of Chambery, Savoy, in the
Kingdom of Sardinia, for the Invention of "IMPROVEMENTS IN MACHINERY
FOR DRILLING OR BORING, INTO STONE,"
FOR DRILLING OR BORING, INTO STONE."
PROVISIONAL SPECIFICATION left by the said Thomas Bartlett at the
Office of the Commissioners of Patents, with his Petition, on the 23rd.
August 1855.
I, THOMAS BARTLETT, CE.. of Chambery, Savoy, in the Kingdom of
Sardinia, do hereby declare the nature of the Invention for "IMPROVEMENTS
IN MACHINERY FOR DRILLING OR BORING INTO STONE" to be as follows:-
This Invention has for its object a peculiar combination of machinery for
giving motion to drills or boring tools for cutting into stone. For this purpose
a cylinder with a piston is employed, which is to be worked by means of steam
or compressed air. The piston rod passes through stuffing boxes at both ends
of the cylinder, and one end of the piston rod gives motion to an axis. by
which the combined machinery is caused to move up to its work on suitable
fixed rails, and the axis by suitable gearing also gives rotatory motion to the
drill or boring tool, and water is forced through a suitable pipe to the point.
where the cut is being made. The other end of the piston rod has fixed to it
a piston working in another cylinder or vessel; this piston. it is preferred,
should be formed with two cupped leathers, but any other form of piston may
be used. When this piston is to the extent of its outward motion, there is a
[Price Sd.]

page_text: hole or holes in the cylinder uncovered by the piston, by which air can flow
into the cylinder or vessel. The drill or boring tool is fixed on an axis or bar,
which receives rotatory motion by toothed wheels from the shaft, put in motion
by the engine but the axis or bar io which the cutting tool is aflixed is
arranged to slide through its toothed wheel, so that the cutter may be forced
forward as well as receive a rotatory motion. The bar or axis to which the
drill or boring tool is fixed has on its other end a piston, which it is preferred
should be made with two cupped leathers, but another form of piston may be
used. This piston works in the cylinder or vessel, into which air is allowed to
flow, as above mentioned, and there is an air valve in the vessel or cylinder, by
which the air escapes when the piston of the drill shaft is by the air forced
beyond the valve.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Bartlett in the Great Seal Patent Office on the
22nd February 1856.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I. THOMAS
BARTLETT, C. E., of Chambery, Savoy, in the Kingdom of Sardinia. send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of August, in the year of our Lord
One thousand eight hundred and fifty-five, in the nineteenth year of Her
reign, did. for Herself. Her heirs and successors, give and grani unto me. the
said Thomas Bartlett, Her special licence that. I, the said Thomas Bartlett, my
executors, administrators. and, assigns, or such others as I, the said Thomas
Bartlett, 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 "IMPROVEMENTS IN MACHINERY
FOR DRILLING OR BORING INTO STONE," upon the condition (amongst others) that
1. the said Thomas Bartlett, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should par-
ticularly 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.

page_text: NOW KNOW YE, that I, the said Thomas Bartlett, do hereby declare the
nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say-
This Invention consists in so arranging machinery for drilling or boring
into stone, that the drilling or boring bit may be caused by a series of blows
communicated to it through the medium of compressed air.
For this purpose
a steam engine is employed. the piston rod of which is continued beyond the
piston. and passes by a stuffing box through the bottom of the cylinder; it
carries a second piston, which works in a second cylinder, in which also
another piston works, which piston is attached to a rod which carries the
drilling or boring bit; thus it will be seen that at each stroke of the steam
engine the air between the two pistons in the second, cylinder will be com-
pressed, and the boring bit and its piston will be 'driven forward. Connected
with this cylinder there is a weighted valve, which allows some. of the air to
escape, so that on the return of the piston worked by the steam engine a
partial vacuum will be produced behind it, which will cause.. the drilling or
boring bit to exceed a short distance, and as the piston arrives at the end of
its stroke it passes over a hole in the cylinder, which admits air to supply the
place of that which was forced out through the valve. In order to give
rotatory motion to the drilling or boring bit, the rod which carries it (which is
round, with a slot or key-way cut in it.) is made to pass through a similarly
formed collar, to which a toothed wheel is fixed, which receives motion by
suitable gearing from the crank shaft of the steam engine, on which also an
eccentric is placed. which works a force pump, which supplies water to the
boring bit, forcing it down its stem, which is made hollow for the purpose; or
the water may be supplied by a pipe direct from the pump. In order to allow
the apparatus to move forward as the work progresses, it is mounted on a
carriage, which runs on a suitable fixed framing, on which a toothed rack is
formed, and into which a pinion attached to the carriage gears. The pinion
is connected by gearing with a ratchet wheel, which is rotated tooth by tooth
by a driver, worked by an excentric on the crank shaft of the steam engine.
And in order that my said Invention may be most fully understood and readily
carried into effect, I will proceed to describe the Drawing hereunto annexed.
√
DESCRIPTION OF THE DRAWING.
Figure is a plan. Figure 2 a side view, and Figure 3 a section, of some
of the parts' of a machine for drilling or boring into stone, constructed accord-
ing to my Invention. a is the cylinder of the steam engine, in which a piston

page_text: b works: c is a piston rod, attached to the piston b, and carrying another
piston d, working in the air cylinder ; is a piston, working in the same
cylinder, and connected with the bar g, which carries the drilling or boring bit
in such a manner that the bar g can revolve without causing the rotation of the
piston. The pistons d and should have cupped leathers turning each way:
h is a valve for allowing some of the air to escape from the cylinder e at each
stroke of the piston. It is a conical valve, kept down by a spiral spring, the
pressure of which can be regulated so as to let more or less air escape,
according to the amount of to and fro motion which it is desired to give to the
drilling or boring bit. i is a hole through which the air is re-admitted; j is
a collar through which the square or round bar g slides. is a toothed wheel,
fixed on to the collar i, and receiving motion from the pinion on the axis m,
which also carries the bevilled pinion n, which works into the bevilled wheel o
on the crank shaft p of the steam engine; g is an excentric on the same shaft,
which works the force pump n, to supply water to lubricate the drilling or
boring bit; s is the carriage on which the whole of the apparatus is mounted:
it runs on the fixed framing t, and has attached to it friction pulleys u. u.
1 is a rack, fixed on the frame ; and c is a pinion which takes into the
same. x is a toothed wheel on the same axis as the pinion, and which
works with a pinion on the axis of the ratchet wheel, which is retained
by the paul z, and rotated by the driver ', which receives motion from an
excentric on the crank shaft p.
In witness whereof. I. the said Thomas Bartlett, have hereunto set my
hand and seal, this Seventh day of February, in the year of our Lord
One thousand eight hundred and fifty-six.
Witness,
A. M. TAPP,
of Chambery, Savoy.
THU BARTLETT. (L.S.)