Improvements in Percussive Apparatus for Boring, Drilling, and like Operations.
Year: 1894

page_text: Date of Application, 24th Mar., 1894
Complete Specification Left, 24th Dec., 1894-Accepted, 2nd Feb., 1895
PROVISIONAL SPECIFICATION.
Improvements in Percussive Apparatus for Boring, Drilling, and
like Operations.
I, JAMES MCEWAN Ross of the Firm of R. G. Ross & Son, Engineers,
Greenhead Works, Glasgow, in the County of Lanark do hereby declare the nature
of this invention to be as follows:-
This invention relates to percussive apparatus of the type described in the
Specifications of Letters Patent granted to me Nos. 14,547 of 1890 and 16,355 of
1892, and like apparatus used for drilling boring and similar operations; and it
consists in the adaptation of such apparatus for rock drilling or boring and mining
and in applying as the means for feeding the boring or drilling tools the pressure
of the air steam or other fluid used for operating the apparatus.
In a simple form of the improved apparatus the cylinder or casing within which
the reciprocating piston is fitted is placed within an outer cylindrical casing or tube
and on its outer end is secured a cup leather or other packing closely fitting the
internal diameter of the outer casing. Air steam or other fluid under pressure
used to operate the reciprocating piston is led through a small orifice in the piston
or liner to the rear of the cup leather or other packing and serves to press on and
feed forward the cylinder of the percussive apparatus and with it the boring or
drilling tool which is carried and operated thereby, whilst the outer tubular casing
is held stationary by means of a crosshead, socket piece or clamp jointed to it and
secured by a mine prop, tripod or other means. A handing wheel is or may be
secured on the tool holder to turn the tool between the blows of the piston
hammer.
In a modification the cylinder or casing of the percussive apparatus is formed
with two cylinders external to it one being on each side and parallel with the main
cylinder. These cylinders are open at their lower ends to a space around the tool
holder or hammer which is in communication by a small orifice with the air or
steam space of the percussive apparatus; and in each cylinder is fitted a plunger
rod or tube closed at the lower end by a cup leather or other packing. The air or
steam pressure acting on the ends of these plungers tends to force them upwards
and this tendency being resisted by the plungers whose outer ends are connected
by a crosshead carrying a socket piece for a prop tripod or other fixture, the main
casing carrying the piston hammer and tool holder is forced downwards and serves
to feed the boring or other tool to its work.
In each case two or more tubes may be fitted one within the other in the form
of telescopic plungers in order to provide for a greater range of feed with a limited
length of the percussive apparatus. Or the same object may be attained by securing
the feed cylinder or casing in an adjustable clamp so that the casing may be moved
forward at intervals as required.
Dated this 22nd day of March 1894
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.

page_text: Improvements in Percussive Apparatus for Boring, Drilling, and
like Operations.
I, JAMES MCEWAN Ross, of the Firm of R. G. Ross & Son, Engineers,
Greenhead Works, Glasgow, in the County of Lanark, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to percussive apparatus of the type described in the
Specification of Letters Patent granted to me Nos. 14,547 of 1890 and 16,355 of
1892, and like apparatus used for drilling boring and similar operations; and it
consists in the adaptation of such apparatus for rock drilling or boring and mining
and in applying as the means for feeding the boring or drilling tools the pressure
of the air steam or other fluid used for operating the apparatus.
In the accompanying drawings
Figure 1 is a sectional plan shewing a modification of my invention in which a.
single feeding tube is employed.
Figures 2 and 3 are respectively a sectional plan and elevation of another
modification in which feed tubes are used.
Figure 4 shews in section a modification in which a duplex feed is
provided.
Figure is an elevation of similar apparatus in which is conjoined with the
pneumatic feed means for adjusting the position of the tool.
Figure 6 is an elevation shewing a convenient mode of carrying the operating
tool and
Figure 7 shews a hand percussive tool with the pneumatic feed arrangement
applied as a cushion to prevent the concussion of the tool being communicated to
the hand of the operator.
In a simple form of the improved apparatus shewn at Figure 1 the cylinder or
casing A within which the reciprocating piston B is fitted is placed or extended
into an outer cylindrical casing or tube C and on its outer end or on the outer end
of the extension A' is secured a cup leather or other packing D closely fitting the
internal diameter of the outer casing C. Air steam or other fluid under pressure
used to operate the reciprocating piston B is led through a small orifice b in the
piston or liner to the rear of the cup leather or other packing D and serves to
press on and feed forward the cylinder A of the percussive apparatus and with it
the boring or drilling tool E which is carried and operated thereby whilst the
outer tubular casing C is held stationary by means of a crosshead socket piece or
clamp F jointed to it and secured by a mine prop, tripod or other means.
handing wheel G is or may be secured on the tool holder E' to turn the tool E
between the blows of the piston hammer.
A
In the modification shewn at Figures 2 and 3 the cylinder or casing A of the
percussive apparatus is formed with two cylinders C, C, external to it one being
on each side and parallel with the main cylinder. These cylinders C, C, are open
at their lower ends to a space H around the tool holder or hammer which is in
communication by a small orifice with the air or steam space of the percussive
apparatus and in each cylinder is fitted a plunger rod or tube I closed at the
lower end by a cup leather or other packing D. The air or steam pressure acting
on the ends of these plungers tends to force them upwards and this tendency being
resisted by the plungers I whose outer ends are connected by a crosshead F carrying
a socket piece F1 for a prop, tripod or other fixture, the main casing A carrying
the piston hammer B and tool holder E' is forced downwards and serves to feed
the boring or other tool E to its work.

page_text: As shewn at Figure 4 two or more tubes I, J, may be fitted one within the other
in the form of telescopic plungers in order to provide for a greater range of feed
with a limited length of the percussive apparatus, chains O being provided to limit
the extent of movement of the tubes. Or the same object may be attained by
securing the feed cylinder or casing as shewn at Figure 5 in an adjustable clamp F¹
so that the casing A may be moved forward at intervals as required, the clamp
being secured on a prop K as shewn at Figure 6.
When the percussive boring or drilling apparatus is adapted to be held by a
handle L as indicated at Figure 7 the handle is fitted with plungers M fitted in
cylindrical casings N formed on the main casing A of the apparatus and part of
the motive fluid is admitted between the ends of these cylindrical casings and the
ends of the plungers M to obviate or lessen concussion.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In percussive apparatus for boring, drilling and like operations, the employ-
ment of part of the motive fluid used in operating the apparatus as means for
feeding the tool to its work.
2. In percussive apparatus for boring, drilling and like operations the combi-
nation with the casing of the apparatus and the stationary clamp or support of a
cylinder or cylinders and a plunger or plungers fitted therein and adapted on
admission of fluid under pressure to feed forward the apparatus against the resistance
of the support, substantially as described.
3. Percussive apparatus for boring, drilling and like operations the parts of which
are constructed, combined and arranged to operate substantially as described under
several modifications with reference to the accompanying drawings.
Dated this 22nd day of December 1894.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62, St. Vincent Street, Glasgow, Agent for the Applicant.