IMPROVEMENTS IN MACHINERY OR APPARATUS FOR DRILLING, BORING OR CUTTING ROCK OR OTHER HARD SUBSTANCES "
Year: 1882

page_text: LETTERS PATENT to George Frederick Wynne of Minera, near Wrexham, in
the County of Denbigh, Secretary to the Minera Mining Company Limited
for an Invention of "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR
DRILLING, BORING OR CUTTING ROCK OR OTHER HARD SUBSTANCES
"
PROVISIONAL SPECIFICATION left by the said George Frederick Wynne
at the Office of the Commissioners of Patents on the 24th February 1882.
GEORGE FREDERICK WYNNE of Minera, near Wrexham, in the County of
Denbigh, Secretary to the Minera Mining Company Limited "IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR DRILLING, BORING OR CUTTING ROCK OR OTHER
HARD SUBSTANCES
"
This invention relates to improvements in double acting rock boring machines or
drills whereby the compressed air or steam is alternately admitted into opposite
ends of the cylinder through ports and passages in the gland and piston rod.
In carrying out my invention I employ a cylinder, of suitable length near the
centre of which are drilled holes for the exhaust and into which is fitted a piston,
the piston rod of which passes through a gland of peculiar construction as herein-
after described. Inside the before mentioned gland is an annular groove which is
in communication with the supply pipe and in which the motive fluid is always
pressing around the piston rod.
From the top of the piston and piston rod a hole is bored centrally and at a
suitable point in the piston rod holes are drilled radially communicating with it
forming the passage to the top end of the cylinder and longitudinal recesses are
also formed on a portion of the periphery of the upper end of the piston rod forming
the passage to the lower end of the cylinder.
By this construction and arrangement if the piston be in such a position that
the radial holes in the piston rod are in communication with the annular space in
the gland the motive fluid will pass into the top end of the cylinder and will
force it down until the before mentioned longitudinal recesses are brought into

page_text: communication with the annular space in the gland so as to raise it in the opposite
direction to that herein before described and so on.
The exhaust takes place from the top end of the cylinder through the radial
openings in the piston rod as these in the downward movement of the piston come
outside the before mentioned gland and from the bottom end of the cylinder through
the holes drilled in its centre as the piston in its upward movement passes from over
them.
The twisting arrangement, the cradle, feed screw and tool holder are substantially
the same as those now generally employed for this class of rock boring machine but
in order to take up the wear in the nut of the feed screw and to keep the drill steady
in its cradle I employ two nuts which are let into two recesses under the bottom
of the cylinder the nut at the top end of the cylinder entirely filling one recess
and that towards the bottom of the cylinder having a certain amount of play
longitudinally the space being filled up by thin packing pieces of iron or steel. By
this arrangement when the nut has worn so as to be loose upon the screw one or
more of these thin packing pieces are taken from the top end of the lower nut
and placed at the bottom end of it thus bringing the nuts closer together and
consequently taking up the slack

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Frederick Wynne in the Great Seal Patent Office on the
23rd August 1882.
4
GEORGE FREDERICK WYNNE, of Minera, near Wrexham, in the County of
Denbigh, Secretary to the Minera Mining Company, Limited IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR DRILLING, BORING, OR CUTTING ROCK OR OTHER
HARD SUBSTANCES"
This invention relates to improvements in double acting rock boring machines or
drills whereby the compressed air or steam is alternately admitted into opposite
ends of the cylinder through ports and passages in the gland and piston rod.
In carrying out my invention I employ a cylinder of suitable length near the
centre of which are drilled holes for the exhaust and into which is fitted a piston,
the piston rod of which passes through a gland of peculiar construction as herein-
after described. Inside the before mentioned gland is an annular groove which is
in communication with the supply pipe and in which the motive fluid is always
pressing around the piston rod.
From the top of the piston and piston rod a hole is bored centrally, and at a
suitable point in the piston rod holes are drilled radially communicating with it
forming the passage to the top end of the cylinder, and longitudinal recesses are
also formed on a portion of the periphery of the upper end of the piston rod forming
the passage to the lower end of the cylinder.
By this construction and arrangement if the piston be in such a position that
the radial holes in the piston rod are in communication with the annular space in
the gland, the motive fluid will pass into the top end of the cylinder and will
force it down until the before mentioned longitudinal recesses are brought into
communication with the annular space in the gland so as to raise it in the opposite
direction to that hereinbefore described and so on.
The exhaust takes place from the top end of the cylinder through the radial
openings in the piston rod as these in the downward movement of the piston come
outside the before mentioned gland, and from the bottom end of the cylinder through
the holes drilled in its centre as the piston in its upward movement passes from over
them.
The twisting arrangement, the cradle, feed screw and tool holder are substantially
the same as those now generally employed for this class of rock boring machine
but in order to take up the wear in the nut of the feed scrow and to keep the
drill steady in its cradle I employ two nuts which are let into two recesses under
the bottom of the cylinder, the nut at the top end of the cylinder entirely filling
one recess and that towards the bottom of the cylinder having a certain amount
of play longitudinally, the spaco being filled up by thin packing pieces of iron or
steel.
In order to enable my invention to be better understood I will proceed to describe
the same by reference to the accompanying drawing in which figure 1 is a
longitudinal section of a rock drill constructed according to my invention and
figure 2, a transverse section of the same through the gland at Y, Z, of figure 1.
Similar letters in both the figures represent similar parts.
O, is the cylinder, P, the piston, R, the piston rod and H, the gland.
The piston P, and piston rod R, are bored out centrally at Č; and B, are the
radial openings made from the outside of the piston rod R, and communicating
with the said central hole C; F, are the longitudinal recesses made in the upper
end of the piston rod. A', is the annular groove or space in the gland H, A, entrance
for the motive fluid.
The action is as follows:-
If the compressed air
other A. La
A

page_text: that the radial openings B, are brought into communication with the annular
space A¹, the motive fluid will be admitted through the central passage C, to the
top side of the piston and will cause the piston to move in the direction of the
arrow Z, until the longitudinal recesses F, are brought into communication with
the before described annular space A', when the motive fluid will be admitted to
the bottom side of the piston and will cause it to move upwards in the direction
of D.
The exhaust takes place through the holes G, in the cylinder as they become
uncovered by the piston passing backwards and forwards over them. The exhaust
also takes place from the top end of the cylinder through the radial openings B, in
the piston rod as they in the downward movement of the piston come outside the
gland H.
The arrangement for taking up the wear in the feed screw nut is as follows:-
The nut I, is let into a recess under the bottom of the cylinder entirely filling
the same.
The nut K at the lower end of the cylinder is also let into a similar
recess but has a certain amount of play longitudinally, the space being filled up by
thin packing pieces L, and M. By this arrangement when the nut has worn so as
to be loose upon the screw one or more of these thin packing pieces are taken from
the top end of the lower nut at L, and placed at the bottom end of it at M, thus
bringing the nuts closer together and consequently taking up the slack.
Having thus described my said invention and the best means I am acquainted
with for carrying the same into effect I wish it to be understood that what I
claim is :-
Firstly. The arrangement herein described of the ports and passages in the gland.
and piston rod of rock drills whereby a reciprocating motion of the piston is
produced substantially in the manner herein before described and represented in
Figures 1, and 2, of the accompanying drawing.
Secondly. The method herein described of taking up the wear of the feed screw
in rock drills, and of keeping the drill steady in the cradle by the employment of
two nuts working in recesses in the cylinder in combination with packing the
whole arranged and operating substantially in the manner herein before described
and represented in the accompanying drawing.
In witness whereof I the said George Frederick Wynne have hereto set
my hand and seal this twenty second day of August in the year of our
Lord one thousand eight hundred and eighty two.
CORE TRENERICK WYNNE (10)