IMPROVEMENTS IN BORING MACHINERY
Year: 1873

page_text: LETTERS PATENT to David Ainsley, of Pelton Fell, in the County
of Durham, Miner, and Pearson Hall, of Chester-le-Street, in the
same County, Ironfounder, for the Invention of "IMPROVEMENTS IN
BORING MACHINERY.”
PROVISIONAL SPECIFICATION left by the said David Ainsley and
Pearson Hall at the Office of the Commissioners of Patents, with
their Petition, on the 20th June 1873.
We, DAVID AINSLEY, of Pelton Fell, in the County of Durham,
Miner, and PEARSON HALL, of Chester-le-Street, in the same County,
Ironfounder, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN BORING MACHINERY," to be as follows:-
The object of this Invention is to produce a simple and efficient
boring machine which can be readily fixed in position and transported
from place to place and will have great scope of action, that is to say,
it will be capable of working either in a horizontal, vertical, or diagonal
direction at the pleasure of the miner.

page_text: The Invention in its simplest form applies to coal working, for which
purpose an auger is used as the boring tool. The auger is fitted to
a screw shaft which is supported in a box bearing, in the face of which
a female screw is cut to receive the threads of the screwed shaft.
The box bearing is made with a hinged piece which is thrown back
to admit the screw shaft and is secured in position by a key. This box
bearing is formed with trunnions which enter half round sockets formed
in the face of a standard or support, which support is intended to
sustain the boring tool in position and resist its back thrust. The
standard is fitted at its opposite ends with screws which are made to
bear against the roof and sill of the cutting and thus hold the standard
firmly in position.
In order to give the standard an enlarged capacity for contracting or
expanding to suit varying circumstances it is made telescopic, and
secured when set by bolts and nuts.
The upper part of the standard consists of an open frame with parallel
sides which form a guide for the box bearing, and in the face of this
open frame a series of half round sockets is made to receive the
trunnions of the box bearings at varying heights. This mode of
mounting the screw shaft allows not only of its being adjusted to
various positions in the direction of the length of the standard, but also
of the boring tool being directed in a diagonal line to the right or left
of the bearing, the bearing for that purpose rocking on its trunnions.
Keyed to the rear end of the screw shaft is a pinion to which rotary
motion is transmitted by gearing, the supports of which may be carried
by a loose collar on the screw shaft. By rotating this pinion the screw
shaft will be curved to advance and rotate the boring tool simultaneously.
When however a drill is required to be used its speed of rotation must be
greatly superior to its rate of advance. To accomplish this the screw
shaft may be made hollow to receive a rod to which the drill may be
fitted, and a slow rotary motion independently of the rotary motion of the
drill may be imparted to the screw shaft to keep the drill up to its work.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said David Ainsley and Pearson Hall in the Great
Scal Patent Office on the 20th December 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, DAVID
AINSLEY, of Pelton Fell, in the County of Durham, Miner, and
PEARSON HALL, of Chester-le-Street, in the same County, Ironfounder,
send greeting..
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twentieth day of Junc, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors.
give and grant unto us, the said David Ainsley and Pearson Hall, Her.
special licence that we, the said David Ainsley and Pearson Hall, our
exccutors, administrators, and assigns, or such others as we, tlic said.
David Ainsley and Pearson Hall, our 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 make, use, exercise, and vend, within tho
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN BORING MACHINERY,"
upon the condition (amongst others) that we, the said David Ainsley
and Pearson Hall, our executors or administrators, by an instrument,
in writing under our, or their, or one of their hands and seals, -
should particularly describe and ascertain the nature of the said.
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six.
calendar months next and immediately after the date of the said Letters,
Patent.
.
NOW KNOW YE, that we, the said David Ainsley and Pearson Hall,...
do hereby declare the nature of our said Invention, and in what manner`
the same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the Drawing.
hereunto annexed, and to the letters and figures marked thereon (that
is to say):-
The object of this Invention is to produce a simple and efficient
boring machine which can be readily fixed in position and transported:

page_text: from place to place and will have great scope of action, that is to say,
will be capable of working either in a horizontal, vertical, or diagonal
direction at the pleasure of the miner.
The Invention in its simplest form applies to coal working, for which
purpose an augur is used as the boring tool. The augur is fitted to a
screw shaft which is supported in a box bearing, in the face of which a
female screw is cut to receive the threads of the screwed shaft.
The box bearing is made with a hinged piece which is thrown back to
admit the screw shaft and is secured in position by a key. This box
bearing is formed with trunnions which enter half round sockets formed
in the face of a standard or support, which support is intended to
sustain the boring tool in position and resist its back thrust. The
standard is fitted at its opposite ends with screws which are made to
bear against the roof and sill of the cutting and thus hold the standard
firmly in position.
In order to give the standard an enlarged capacity for contracting
or expanding to suit varying circumstances it is made telescopic.
L
In the accompanying Drawing Fig. 1 shews a sectional elevation,
and Fig. 2 a side view of the apparatus adapted to the boring of
coal.
A is the standard or support, which at its upper part consists of an
open frame with parallel sides, which form a guide for the box
bearing B, and in the face of this open frame a series of sockets a, a, is
made to receive the trunnions of the box bearing at vaying heights.
Figures 3 and 4 shew in plan and front view the box bearing on an
enlarged scale. The upper half of the bearing it will be seen consists of
a hinged piece B¹ which is thrown back to admit of the insertion of the
screw shaft C which carries at its inner end the augur or boring tool D.
A female screw is cut in the box bearing to receive the screw shaft and
ensure the advance of the augur on rotary motion being imparted to the
screw shaft. This motion may be given by means of a crank handle E
which is capable of radial adjustment to adapt it to work when required
in a confined space..
The hinged portion of the box bearing when shut down as shewn at
Figures 3 and 4 is secured by means of a pin 6 which passes through a
hole made in the main portion of the box bearing and through a lug

page_text: with which the hinged piece is provided. The advantage offered by this
hinged piece is that when the screw shaft has advanced the boring tool'
to the required distance it may be instantly shifted to a back position
without the tedious operation of returning it by reversing the rotation.
of the screw shaft. By thus mounting the screw shaft in an adjustable.
rocking box bearing not only is the spindle of the boring tool capable of.
being adjusted to various positions in the direction of the length of the.
standard, but the boring tool may also be directed in a line diverging.
from the horizontal, the bearing for that purpose rocking on its
trunnions, or an inclination to the right or left may be obtained by
turning the standard upon its supporting points.
To provide for the contraction and expansion of the standard A to
suit various heights of cutting, a tubular picce A is fitted to the stem
of the standard. A series of holes is made through this tube and
corresponding holes are made in the end of the stem to receive keys
which will secure the parts tighter together; a¹ are the screws at the
opposite ends of the standard for bearing against the roof and sill of the
cutting, and fixing the standard in position.
When it is desired to drill a hole so near the roof or sides of the
cutting that the crank handle shewn at Fig. 2 cannot be used an
arrangement like that illustrated at Fig. 5 may be employed. In this
Figure it will be seen that keyed to the rear end of the screw shaft C
is a pinion c to which rotary motion is transmitted by bevil gearing c¹,
c, c, the supports of which are carried by a loose collar c¹ on the screw
shaft. By rotating the pinion c by means of the crank handle E and
the intermediate bevil pinions, the screw shaft will be caused to advance
and rotate the boring tool simultaneously. When however a drill is
required to be used its speed of rotation must be greatly superior to its
rate of advance. To accomplish this the screw shaft may be made
hollow to receive a rod to which the drill may be fitted, and a slow
rotary motion, independently of the rotary motion of the drill, may be
imparted to the screw shaft to keep the drill up to its work. This
arrangement is illustrated in partial sectional view at Fig. 6 where C.
is the hollow screw shaft fitted with a hand wheel F for giving it a slow
rotary motion, and thereby causing it to traverse slowly through the box
bearing. Passing through this screw shaft and through the hand
wheel F is a rod G which carries the drill at its inner end. To its outer

page_text: end is fitted the crank handle E or its equivalent for imparting to the
drill the rapid axial motion required.
1.
Having now set forth the nature of our Invention of "Improvements
in Boring Machinery" and explained the manner of carrying the same
into effect, we wish it to be understood that under the above in part
recited Letters Patent we claim, mounting the screwed shaft or spindle
used in traversing the boring tool in a box bearing constructed and
arranged as above described.
In witness whereof, we, the said David Ainsley and Pearson Hall,
have hereunto set our hands and seals, the Eighteenth day of
December, in the year of our Lord One thousand eight hundred
and seventy-three.