IMPROVEMENTS IN DRILLING, DATAR ATTED EARTHY SUBSTANCES
Year: 1861

page_text: LETTERS PATENT to John Poole, James Wright, Frederick Shand
Hemming, George Searby, all of 35, Moorgate Street, City of London,
Mining Engineers, for the Invention of "IMPROVEMENTS IN DRILLING,
DATAR ATTED EARTHY SUBSTANCES."
Sealed the 9th August 1861, and dated the 18th February 1861.
PROVISIONAL SPECIFICATION left by the said John Poole, James Wright,
Frederick Shand Hemming, and George Searby at the Office of the
Commissioners of Patents, with their Petition, on the 13th February
1861.
We, JOHN POOLE, JAMES WRIGHT, FREDERICK SHAND HEMMING, GEORGE
SEARBY, all of 35, Moorgate Street, City of London, Mining Engineers, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
DRILLING, BORING, OR EXCAVATING ROCK OR OTHER EARTHY SUBSTANCES," to be
as follows:-
In perforating rock or other hard substance, instead of striking the boring
instrument or drill with a hammer, we propose to effect the same by using a
cylindric or other shaped tube adjustable at pleasure, in which is fitted a
traversing piston or plunger with necessary valve gearing, and actuated by
alternate jets of atmospheric air compressed by steam power, or other available
means, and to which piston is attached or free the drill or other instrument
to be used in the perforation or excavation. The whole to be mounted upon
a suitable frame.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Poole, James Wright, Frederick Sband Hemming, and
George Searby in the Great Seal Patent Office on the 13th August
1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, Jonn
POOLE, JAMES WRIGHT, FREDERICK SHAND HEMMING, GEORGE SEARBY, all of
35, Moorgate Street, City of London, Mining Engineers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirteenth day of February, in the year of our Lord
One thousand eight hundred and sixty-one, in the twenty-fourth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said John Poole, James Wright, Frederick Shand Hemming, Georgo
Searby, Her special licence that we, the said John Poole, James Wright,
Frederick Shand Hemming, George Searby, our executors, administrators,
and assigns, or such others as we, the said John Poole, James Wright,
Frederick Shand Hemming, George Searby, our exccutors, 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 Inven-
tion for "IMPROVEMENTS IN DRILLING, BORING, OR EXCAVATING ROCK OR OTHER
EARTHY SUBSTANCES," upon the condition (amongst others) that we, the said
John Poole, James Wright, Frederick Shand Hemming, George Searby, our
executors or administrators, by an instrument in writing under our, 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 we, the said John Poole, James Wright, Frederick
Shand Hemming, George Searby, do hereby declare the nature of our said
Invention, and in what manner the same is to be performed, to be par-
ticularly described and ascertained in and by the following statement, that is
to say:
In perforating rocks or other hard substances, instead of striking the boring
tool or drill with a hammer, we propose to effect the same by using a cylindric
or other shaped adjustable tube, within which is fitted a piston or plunger
having proper valves, and actuated by jets of atmospheric air compressed by

page_text: steam power, or other available means; this piston is either free from or;
attached to the drill or borer; by causing the compressed air to impinge or;
expand within the cylinder the latter is made to rise, and in falling gives ar
blow to the head of the drill. By connecting the drill with the motive parts,
of the cylindrical hammer a jumping rotative motion may be given to it. We;
mount the whole upon a proper frame, which may be so arranged as to enable;
the blow to be given to the head of the drill either in a horizontal or a vertical,
direction; furthermore, by combining two cylindric hammers and and pistons
together a double action may be obtained, so as to drive two drills at the
same time, the one hammer rising when the other is falling and giving.
the blow. 1
In order more clearly to illustrate the nature of our Invention, and show,
how the same is constructed and acts, we have to this Specification appended;
the accompanying Drawings, which are only intended, however, to show the
leading principles of our Invention, and how the same acts, as the mode of;
applying and working the same must be modified and altered to suit the
peculiar situation in which it is placed, and the, kind of work to be acted
upon, also various modifications and substitutions may be introduced so long
as the principle is retained.

page_text: admitting the air for another stroke. In Figure 1 the action of the slot link
moving with the alternate motion of the piston will give the link a reciprocal
vertical motion, which, acting on the rock, will, by means of the piston rod,
carry round the drill every stroke. It will be easily seen that by a slight
alteration in the piston and valves the cylinder may be made stationary, and
the piston act as the hammer. Instead of striking the head of the drill
directly, the stroke may be given to the end of an intermediate lever, which
may convey the blow to the drill. It will be also seen that, instead of having
the machine placed vertically, it
horizontally.
may be placed so as to give the blow
Having now described the nature of our Invention, and how the same is
constructed and acts, we now state that we claim and wish secured to us by
the before in part recited Letters Patent,-
1st, the application and use of compressed air as a motive power when
applied by any machine to actuate drills used for boring or perforating rocks
or other earthy matters, substantially as herewithin described and set forth in
the accompanying Drawings.
2nd, the use of a cylindric hammer in combination with a fixed piston
actuated by means of compressed air, in such a manner as to give successive
blows, either directly or through the medium of intervening levers, to a drill or
borer used in perforating rocks or other earthy matters, the said drill being
made to rotate either by hand or by mechanical arrangements, substantially as
herewithin described and set forth in the accompanying Drawings.
3rd, the use of a moveable piston or hammer within a fixed cylinder, the
former acted upon by jets of compressed air, for the purpose of giving blows
either directly or through the medium of intervening levers to the head of a
drill or borer used in perforating rocks or other matters, either by hand or by
mechanical arrangements, substantially as herewithin described and set forth
in the accompanying Drawings.
In witness whereof, I, the said James Wright, on behalf of myself and
the said John Poole, Frederick Shand Hemming, and George Searby,
have hereunto set my hand and seal, this Thirteenth day of August,
in the year of our Lord One thousand eight hundred and sixty-one.
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