IMPROVEMENTS IN MACHINES FOR DRILLING OR BORING HOLES IN COAL, ROCKS, AND STONES
Year: 1876

page_text: LETTERS PATENT to James Mawson, of Eldon, in the County of Durham,
Miner, for the Invention of "IMPROVEMENTS IN MACHINES FOR DRILLING OR
BORING HOLES IN COAL, ROCKS, AND STONES."
Sealed the 18th May 1877, and dated the 22nd November 1876.
PROVISIONAL SPECIFICATION left by the said James Mawson at the Office
of the Commissioners of Patents on the 22nd November 1876.
JAMES MAWSON, of Eldon, in the County of Durham, Miner.
"IMPROVEMENTS
IN MACHINES FOR DRILLING OR BORING HOLES IN COAL, ROCKS, AND STONE."
This Invention consists in machines for drilling or boring holes in coal, rocks,
and stone, whereby that operation is performed in a much simpler and economical
manner than by the machines hitherto employed for that purpose.
According to this Invention the drill or boring tool is carried by a rod or bar
baving a screw thread formed on the outside thereof, and which rod or bar works
in, and is supported by a metal cylinder. Within this metal cylinder a tube of
iron or other suitable metal is placed, and secured by means of a set screw or
screws, which pass through the sides of the metal cylinder, and which tube is pro-
vided on its interior with a thread corresponding to that on the drill rod or bar. The
tapped tube is provided with an enlarged head to prevent its passing too far into
the metal cylinder. Upon the fore end of the metal cylinder a hoop or ring is
placed, and upon which hoop or ring are formed two lugs or projections, which
carry two metal bolts or pins, and upon the rear end of the cylinder another hoop
or ring, having two lugs or projections thereon, is placed. Through these last-
mentioned lugs or projections two screw pins work for the purpose herein-after
described. Upon the rear end of the cylinder a cap or terminal, having a pointed
or other suitably shaped end, is screwed or otherwise attached.
The action of the apparatus is as follows:-When it is desired to drill a hole in
coal or other substance the drill rod or bar is screwed into the cylinder to its
fullest extent, and the machine is then brought into position, the end of the cap on
the cylinder being brought to bear against the sides of the drift or other suitable
surface, and the two screw pins screwed against the same surface, to prevent the
71

page_text: cylinder from moving; supports may also be placed against the two pins carried
by the lugs or projections on the fore end of the cylinder for the same purpose
When the machine is so fixed in position a rotary and forward motion is given to
the drill rod or bar by means of a ratcliet brace or braces fixed thereon for that
purpose; and when the drill rod or bar has been screwed out of the cylinder to
nearly its entire length, and it is still desired to continue the drilling, the cylinder
is turned by means of the pins on the forward hoop or ring until the drill rod or
bar, which is held stationary, is screwed up as before. Should the screw thread
in the internal tube of the cylinder become worn out the tube can be removed from
the cylinder, and another tube substituted therefor.
SPECIFICATION in pursuance of the conditions of the Letters Patent, and of
an Order of the Lord Chancellor, filed by the said James Mawson in the Great
Seal Patent Office on the 16th June 1877.
JAMES MAWSON, of Eldon, in the County of Durham, Miner.
ss IMPROVEMENTS
IN MACHINES FOR DRILLING OR BORING HOLES IN COAL, ROCKS, AND STONES."
My said Invention consists in certain improvements in machines for drilling or
boring holes in coal, rocks, and stone, whereby that operation is performed in a
much simpler and more economical manner than by the machines hitherto employed
for that purpose.
According to my said Invention the drill or boring tool is carried by a rod or
bar, having a screw thread formed on the outside thereof, and which rod or bar
works in and is supported by a metal cylinder, which is cast in two separate parts,
and connected by a hinge. Within this metal cylinder a tube of iron or other
suitable metal is placed, and secured by means of a set screw or screws, which
passes or pass through the sides of the metal cylinder, and which tube is provided
on its interior surface with a thread corresponding to that on the drill rod or bar.
The tapped tube is provided with an enlarged head to prevent its passing too far
into the metal cylinder. Upon the fore end of the metal cylinder a hoop or ring or
flange is placed, the latter being provided with two lugs or projections which carry
two metal bolts or pins, and upon the rear end of the cylinder another hoop or ring
or flange having two lugs or projections thereon is placed. Through these last-
mentioned lugs or projections two screw pins work for the purpose herein-after
described. Upon the rear end of the cylinder a cap or terminal cover, having a
pointed or suitably shaped end, is screwed or otherwise attached.
The action of the apparatus is as follows:-When it is desired to drill a hole in
coal or other substance the drill rod or bar is screwed into the cylinder to its fullest
extent, and the machine is then brought into position, the end of the cap on the
cylinder being brought to bear against the sides of the drift or other suitable
surface, and the two screw pins screwed against the same surface to prevent the
cylinder from moving. Supports may also be placed against the two pins carried
by the lugs or projections on the fore end of the cylinder for the same purpose.
When the machine is so fixed in position a rotary and forward motion is given to
the drill rod or bar by means of a ratchet brace or braces fixed thereon for that
purpose; and when the drill rod or bar has been screwed out of the cylinder to
nearly its entire length, and it is still desired to continue the drilling, the cylinder
is turned by means of the pins on the forward hoop or ring, or flange, until the
drill rod or bar, which is held stationary, is screwed up as before. Should the screw
thread in the internal tube of the cylinder become worn out the tube can be
removed from the cylinder, and another tube substituted therefor.
Having thus declared and ascertained the nature of my said Invention I would
observe in conclusion that what I consider novel and original, and therefore claim
as constituting the Invention secured to me by the said herein-before in part recited

page_text: Letters Patent is, the combination and arrangement of parts and mechanism, sub-
stantially as and for the purposes herein-before described and set forth.
In witness whereof, I, the said James Mawson, have hereunto set my hand
and seal, this Thirteenth day of June, in the year of our Lord One thousand
eight hundred and seventy-seven.
JAMES MAWSON. (L.S.)