IMPROVEMENTS IN DIAMOND ROCK-BORERS
Year: 1879

page_text: LETTERS PATENT to Parke Pittar, of No. 50, Gracechurch Street, in the City
of London, and County of Middlesex, Gentleman, and Charles Andrew Terrey,
of No. 29, St. George's Road, Southwark, in the County of Surrey, Engineer,
for the Invention of "IMPROVEMENTS IN DIAMOND ROCK-BORERS."
Sealed the 2nd May 1879, and dated the 25th February 1879.
PROVISIONAL SPECIFICATION left by the said Parke Pittar and Charles
Andrew Terrey at the Office of the Commissioners of Patents on the 25th
February 1879.
PARKE PITTAR, of No. 50, Gracechurch Street, in the City of London, and County
of Middlesex, Gentleman, and CHARLES ANDREW TERREY, of No. 29, St. George's
Road, Southwark, in the County of Surrey, Engineer. "IMPROVEMENTS IN
DIAMOND ROCK-BORERS."
The object of our Invention is the construction of a boring machine whereby the
hardest rock may be bored by hand labor and cores be brought out, showing clearly
the nature of the strata through which the diamond drill has passed.
Although our diamond rock-borer is specially combined to be driven by hand in
confined places we may drive it by steam, air, water, electricity, or other available
means, according to the circumstances of particular cases.
As will be seen on reference to the accompanying two Sheets of Drawing the
main features of our improved rock boring machine are, the compactness obtained
by the general combination of its parts and the facility with which long cores may
be extracted by the addition of sections or lengths to the borer, whereby this
machine is specially adapted for trying the quality of lodes in galleries too narrow
to permit the use of long jumpers or percussive drills with advantage, even if
angled; our machine also comprises an improved feed motion, automatically regu-
lating the rapidity of the forward movement of the diamond drill head according to
the bardness or softness of the rock or strata through which it is penetrating.
On the accompanying 2 Sheets of Drawing, forming part of this our Provisional
Specification, we have shown a diamond rock-borer embodying our improvements;
we desire it however to be understood that we do not confine ourselves to the
precise details of its construction as therein illustrated.

page_text: Figure 1 (Sheet I.) represents a side view of our improved machine complete
with stretcher bar.
Figure 2 (Sheet I.) being an end or back view of same; and
Figure 3 (Sheet II.) an enlarged view of the driving gear and feed motion,
portions of the stretcher and boring bars being also shown.
A indicates the stretcher bar upon which the apparatus is fixed; B, saddle or
moveable plate secured upon bar A; C, C¹, handles and fly wheel; D, driving
wheel; E, pinion in gear with D; F, toothed wheel secured to pinion E; G, boring
bar; H, wheel and nut for screw on bar G; I, distance piece; K, L, wheels for
regulating rate of feed; M, countershaft for wheels K, L; N, friction plate;
O, leather washer; P, spring; Q, lock nuts; R, clutch; S, hand lever; T, drill and
tube; a, a, bolts at back of saddle B; b, b, set screws; g, spline.
The working is as follows:- Upon the wheel C being set in motion the wheels
D, E, and F are caused to, revolve, as also the boring bar G, by means of a feather
or key working within the spline 9. Motion is also given to the nut wheel H by
the intermediate wheels K and L upon the countershaft M. By varying the
respective number of teeth on the two wheels F and H a differential inotion is
obtained in the same, by which means the bar G can be made to travel in a longi-
tudinal direction, the proportionate rate of travel to the number of revolutions boing
thus regulated to suit the circumstances of the case. By altering the number of
teeth in the wheel K the penetration of the boring bar G is increased by the greater
rapidity of rotation given to the feed nut H.
The wheel K is so arranged as to slide upon the shaft M, being driven by a
feather or key secured upon the same: Should it be required at any moment to
arrest the feed this wheel can readily be drawn out of gear by means of the hand
lever S and clutch R, when owing to the nut wheel H remaining stationary the
bar G will at once commence to run out of the boring without the driving power
having in any way been checked or reversed.
Also, should the drill T suddenly meet with any other obstruction than that
provided for, the forward feed motion will at once adjust itself to the altered
circumstances, the wheel L being caused to slip round upon the shaft M, to which
it is only held by the pressure of the spring P upon the friction plate N and
washer O. The amount of this pressure can readily be lessened or increased by the
nuts as may be required.
By loosening the bolts a, a, at the back of the saddle B the drill can be moved
up or down to any required angle, whilst a movement in a horizontal direction is
obtained by releasing the set screws b, b, (see Figs. 2 and 3).

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Parke Pittar and Charles Andrew Terrey in the Great Seal Patent
Office on the 22nd August 1879.
PARKE PITTAR, of No. 50, Gracechurch Street, in the City of London, and County
of Middlesex, Gentleman, and CHARLES ANDREW TERREY, of No. 29, Saint George's
Road, Southwark, in the County of Surrey, Engineer. "IMPROVEMENTS IN
DIAMOND ROCK-BORERS."
.
The object of our Invention is the construction of a boring machine whereby the
hardest rock may be bored by hand labor, and cores be brought out, shewing
clearly the nature of the strata through which the diamond drill has passed.
Although our diamond rock-borer is specially combined to be driven by hand in
confined places we may drive it by steam, air, water, electricity, or other available
means, according to the circumstances of particular cases.
As will be seen on reference to the accompanying Sheet of Drawing, forming part
of this our Specification, the main features of our improved rock-boring machine
are, the compactness obtained by the general combination of its parts and the
facility with which long cores may be extracted by the addition of sections or
lengths passed through the boring-bar to any desired depth without removing the
machine, whereby this machine is specially adapted for trying the quality of lodes
in galleries too narrow to permit the use of long jumpers or percussive drills with
advantage even if angled. Our machine also comprises an improved feed motion
automatically regulating the rapidity of the forward movement of the diamond drill
head according to the hardness or softness of the rock or strata through which it is
penetrating.
On the accompanying Sheet of Drawing we have shown a diamond-rock-borer
embodying our improvements; we desire it however to be understood that we do
not confine ourselves to the precise details of its construction as therein illustrated,
as such may be varied while retaining the general combination of its parts, whereby
it is adapted to operate so as to obtain the advantages above set forth.
Figure 1 represents a side view of our improved machine complete with stretcher
bar.
Figure 2 being an end or back view of same, and
Figure 3, an enlarged view of the driving gear and feed motion, portions of the
stretcher and boring bars being also shown.
A indicates the stretcher bar upon which the apparatus is fixed; B, saddle or
moveable plate secured upon bar A; C, C³, handles; D, fly wheel; E, driving
wheel; F, pinion in gear with E; G, toothed wheel secured to pinion F; H, boring
bar; I, wheel and feed nut for boring bar H; K, distance piece; L, M, wheels for
regulating rate of feed; N, countershaft for wheels L and M; O, friction_plate;
P, leather washer; Q, spring; R, lock nuts; S, clutch; T, hand lever; U, drill
bar; a, a, set screws at back of saddle B; b, b, bolts for saddle; h, spline or key
way; W, water inlet; X, cap for closing opening for introduction of bar and water
inlet.
The working is as follows:-
Upon the fly wheel D being caused to revolve motion is imparted through the
right angled wheels E and F to the bar H by means of a feather working within
the spline h; at the same time the wheel G being connected to the pinion F by the
sleeve g is also caused to revolve, carrying with it the wheels L, M, and nut wheel I.
By varying the respective number of teeth on the two wheels Gand I a differential
motion is obtained in the same, by which means the bar H can be made to travel
in a longitudinal direction, the proportionate rate of travel to the number of revolu-
tions being thus regulated to suit the circumstances of the case. By reducing the
number of teeth in the wheel L the penetration of the boring bar H is increased,
owing to the greater rapidity of rotation given to the wheel and feed nut I,

page_text: The wheel L is so arranged as to slide upon the shaft N, being driven by a
feather or key secured upon the same. Should it be required at any moment to
arrest the feed this wheel L can readily be drawn out of gear by means of the hand
lever T and clutch, S, when owing to the nut wheel I remaining stationary the
bar H will at once commence to run out of the boring without the driving power
having in any way been checked or reversed.
Also, should the drill U suddenly meet with any other obstruction than that
provided for, the forward feed motion will at once adjust itself to the altered circum-
stances, the wheel M being caused to slip round upon the shaft N, to which it is
only held by the pressure of the spring upon the friction plate O and washer P.
The amount of this pressure can readily be lessened or increased by the nuts R as
may be required by loosening the set screws a, a, at the back of the saddle B. The
same can be moved round upon the bar A, or in a horizontal direction, or be raised
or lowered to any required height, whilst by releasing the bolt b, b, the boring
bar H can readily be adjusted to any vertical angle.
Upon removing the cap X the additional sections can readily be passed through
the water inlet W and boring bar H.
Having now described and ascertained the nature of our said Invention, and in
what manner the same is or may be performed, what
We claim as secured to us by the hereinbefore in part recited Letters Patent
is,-
Firstly. The use of a diamond rock-borer, constructed, combined, and arranged
to operate substantially as and for the purposes herein before described.
Secondly. The use in a diamond rock-borer of a differential feed motion, whereby
the forward movement of the diamond drill is automatically regulated, substantially
as and for the purposes hereinbefore specified.
In witness whereof, I, the said Charles Andrew Terrey, for myself and on
behalf of my co-patentee, have hereunto set my hand and seal, this Twenty-
second day of August, in the year of our Lord One thousand eight hundred
and seventy nine.
CHARLES ANDREW TERREY, (L.S.)