IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR PERFORATING BAG CAL 111 AMO,AL,ATE, & OTHER MINERAL SUBSTANCES
Year: 1873

page_text: LETTERS PATENT to Martin Macdermott, of Scott's Chambers, 25 & 20,
Pudding Lane, in the City of London, Architect, for tho Invention
of "IMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR PERFORATING
BAG CAL 111
AMOGM
PROVISIONAL SPECIFICATION left by the said Martin Macdermott at
the Office of the Commissioners of Patents, with his Petition, on
the 22nd February 1873.
I, MARTIN MACDERMOTT, of Scott's Chambers, 25 & 26, Pudding
Lane, in the City of London, Architect, do hereby declare the nature of
of the said Invention for "IMPROVEMENTS IN THE METHOD OF AND APPARATUS
FOR PERFORATING ROCK, COAL, SLATE, & OTHER MINERAL SUBSTANCES," to be as
follows:
-
Tho first part of my Invention applies to the standard or standards of
perforating machines for working in rock, coal, slate, and other mineral
substances, and is devised so that such standards can be fixed and firmly
hold in the material to be bored or in such other material as the standard
may be resting upon, while the process of boring is being effected in

page_text: quarries and other places where there is no roof or other bearing surface
except the ground or face of the rock to which to fix the standard. The
standard of my Invention consists in two metal bars crossing each other
and jointed at their intersection at about the middle of their length.
The lower ends of those bars are so formed as to readily enter two nicks
or grooves proviously made in the material to be bored or upon which
tho standard rests, and the upper ends of the same bars are pin-jointed
so as to connect with a tube which carries the perforating mechanism.
A screw passes into this tube having a nut on it bearing against the end
of the tube, and by turning such nut (or the screw) the two metal bars
forming the legs of the apparatus can either be forced apart or drawn
together so as to exert a great pressure against the sides of the nicks or
grooves already mentioned, and thus hold the standard firmly in
position. At the side of the tube opposite to that on which the hole has
to be drilled and fixed either to the tube or to the perforating mechanism
which it carrics, is a hanging bar which rests at its lower extremity on
the material to be bored or on which the standard rests and takes the
back thrust of the drill.
The second part of my Invention has been devised to obviato a
difficulty which occurs when the boring or perforating process is effected
in places where the standard has to be fixed between the roof and floor
(or between any other two bearing surfaces), and where the distance
between the surfaces is variable. In such cases standards of different
lengths are now generally used, and this part of my Invention consists
in attaching to the tube which carries the perforating mechanism an
apparatus well-known mechanically as the "lizzy-tongs" to any two
opposito joints of which I attach a screw, and by turning the said screw
the joints of the tongs are either drawn together or forced apart, thus
lengthening or shortening the standard as required.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing dato tho Twenty-second day of February, in tho
year of our Lord One thousand eight hundred and seventy-three, in tho
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
givo and grant unto me, the said Martin Macdermott, Her special
licence, that I, the said Martin Macdermott, my cxccutors, adminis-
trators, and assigns, or such others as I, tho said Martin Macdermott,
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 mako,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"ÎMPROVEMENTS IN THE METHOD OF AND APPARATUS FOR PERFOTING ROCK, COAL,
SLATE, AND OTHER MINERAL SUBSTANCES," upon the condition (amongst
others) that I, the said Martin Macdermott, my executors or adminis-
trators, by an instrument in writing under my, or their, or one of their
hands and scals, should particularly describe and ascertain the naturo
of the said Invention, and in what manner the same was to be
performed, and cause the same to bo filed in tho Groat 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 Martin Macdermott, 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 :-
The first part of my Invention applies to the standard or standards of
perforating machines for working in rock, coal, slate, and other mineral
substances, and is devised so that such standards can be fixed and firmly
held in the material to be bored, or in such other material as tho
standard may be resting upon while the process of boring is being
effected in quarrios and other places where there is no roof or other
bearing surfaco except the ground or face of the rock to which to fix the
standard. The standard of my Invention (see Figure 1) consists in two
metal bars A and B crossing each other and jointed at their inter-
section at about the middle of their length. The lower ends of these
bars aro so formed as to readily enter two nicks or grooves "0,0,"
previously made in the material to be bored, or upon which the standard
rests, the upper ends of the same bars are pin-jointed so as to connect

page_text: with a tubo D which carries the perforating mechanism. A screw passes
into this tube having a nut on it bearing against the end of the tube,
and by turning such nut or the screw the two metal bars forming the
legs of the apparatus can either be forced apart or drawn together so as
to exert a great pressure against the sides of the nicks or grooves already
mentioned, and thus hold the standard firmly in position. At the side of
the tubo opposite that on which the holo has to be drilled, and fixed
either to the tubo or to the socket of the perforating mechanism which
it carries, is a hanging bar E which rests at its lower extremity on the
material to be bored, or on which the standard rests, and takes the back
thrust of the drill.
The second part of my Invention (see Figure 2) has been devised to
obviato a difficulty which occurs when the boring or perforating process
is effected in places where the standard has to be fixed between the roof
and floor (or between any other two boaring surfaces), and where the
distanco between these surfaces is variable. In such cases standards of
different lengths are now generally used, and this part of my Invention
consists in attaching to tho tube T which carries the perforating
mechanism an apparatus well-known mechanically as the "lizzy-tongs,'
to any two opposite joints of which I attach a screw S or other adjusting!
bar, and by turning the said screw or otherwise adjusting the said bar,
the joints of the tongs aro cither drawn together or forced apart, thus
lengthening or shortening tho standard as required.
"
In witness whereof, I, the said Martin Macdermott, havo hereunto
set my hand and scal, this Nineteenth day of August, in the year
of our Lord One thousand eight hundred and seventy-three.
MADAN MACDERMOT
"