New or Improved Electrical Appliance for Extracting Broken Drills from Bore-holes.
Year: 1896

page_text: Date of Application, 31st Jan., 1896
Complete Specification Left, 21st Mar., 1896-Accepted, 16th May, 1896
PROVISIONAL SPECIFICATION.
New or Improved Electrical Appliance for Extracting Broken Drills
from Bore-holes.
We FREDERICK WALKER of Grimethorpe near Barnsley in the County of
York Mining Engineer and Contractor, and WALTER CALLIS SANDERSON of
50 White-Lea Road, Swinton, in the County of York, Electrical Engineer do
hereby declare the nature of this invention to be as follows:-
Our present invention relates to an electrical appliance for use in extracting
broken drills from bore-holes. Hitherto when drilling bore-holes into rock or other
hard mineral in sinking, heading or similar operations for blasting purposes it some-
times occurs that the drill breaks when a bore-hole is nearly completed for receiving
the blast and as the bore-holes are obviously not more than the diameter of the
drill it is necessarily difficult to extract the remaining broken part of the drill
within the hole by any mechanical means and it is therefore generally required to
drill a fresh hole before blasting operations can be completed thus wasting a con-
siderable amount of time and causing additional expense; the object therefore of
our present invention is to arrange an electrical appliance with the aid of which
the remaining parts of broken drills may be conveniently and expeditously with-
drawn from their respective bore-holes thus permitting a new drill to be inserted
and the same hole completed so saving the time and expense before mentioned; to
attain which we arrange an iron cylinder with an external diameter a little less
than the diameter of the bore-hole and concentriclly within said cylinder we fix a
soft iron core preferably circular in cross section. Around said core we coil
insulated copper wire.
We also arrange a soft iron cylinder around said core and wind the wire around
the same and so arrange the wire to terminate near the upper end of the core thus
forming the terminals for the connection of the two wires which are connected to
a secondary or other electric battery which will supply the required electrical
energy.
The upper part of outer cylinder receives a watertight cover and it has screwed
into it the end of a suitable length of gas piping through which extend the electric
wires for conveying the electricity from the battery.
The lower end of core is screwed into a brass cover which fits into a brass cover
which latter fits into the lower end of outer cylinder by means of a water-tight
joint. The end of centre core extends in the form of a head on the outer face of
brass cover.
It will be obvious that by turning on the current our appliance aforesaid becomes
an electro-maguet the flow of electricity passing from the lower end of the outer
cylinder to the iron head of the core or the reverse as will be well understood, and
by placing the appliance down a bore-hole the broken piece of drill would be at
once attracted to said magnet and could then be easily lifted out of the hole
therewith.
We would have it understood that the electro-magnet before described could be
modified in several ways without departing from the essential particulars of our
invention and that in some cases a permanent magnet could be arranged for the
attainment of the object specified.
Dated this 29th day of January 1896
H. F. BOUGHTON,
Barnsley, Agent.

page_text: COMPLETE SPECIFICATION.
New or Improved Electrical Appliance for Extracting Broken Drills
from Bore-holes.
We FREDERICK WALKER of Grimethorpe near Barnsley in the County of
York Mining Engineer and Contractor and WALTER CALLIS SANDERSON of
50 White Lee Road Swinton in the county aforesaid, Electrical Engineer, 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:
Our present invention relates to an electrical appliance for use in extracting
broken drills from bore-holes. Hitherto when drilling bore-holes into rock or
other hard mineral in sinking heading or similar operations for blasting purposes
it sometimes occurs that the drill breaks when a bore-hole is nearly completed for
receiving the blast, and as the bore-holes are obviously not more than the diameter
of the drill it is necessarily difficult to extract the remaining broken part of the
drill which has been left within the hole by any mechanical means and it is there-
fore generally required to drill a fresh hole before blasting operations cau be
completed thus wasting a considerable amount of time and causing additional
expense; the object therefore of our present invention is to arrange an electrical
appliance with the aid of which the remaining parts of broken drills may be con-
veniently and expeditiously withdrawn from their respective bore-holes thus
permitting a new drill to be inserted and the same hole completed su saving
the time and expense before mentioned; to attain which we arrange our apparatus
and work the same in the manner described with reference to the accompanying
drawings which are to be taken as part of this Specification and read there-
with.
Fig. 1 is an elevation partly in section of one form of our improved electrical
appliance complete, and
Fig. 2 is an elevation in view of the part of said apparatus shown in section at
Fig. 1, and
Fig. 3 is a sectional elevation of a modified form of our appliance shown in
position in a bore-hole with brokeu part of a drill attached thereto ready to be
extracted.
Similar letters of reference denote corresponding parts in each view.
We arrange an iron cylinder A within which we fix a soft iron core B preferably
circular in cross section and around said core B we coil insulated copper wire C
which we arrange to terminate near the upper end of the core so forming the
terminals for the connection of the two wires + and - which may be connected to
a secondary or other electric battery or may receive the electric current from a
lamp or any other convenient source. The upper part of outer cylinder A
receives a watertight brass cover a' and it has screwed into it the end of a suitable
length of gas pipe or tubing T which is preferably bent at its upper end as shown
at Fig. 1 to prevent water from falling into it and through said tubing T
the electric wires and extend for conveying the electricity from the
battery.
=
The lower end of core B is screwed into a brass cover a which latter fits or is
screwed into the lower end of outer cylinder A and is made water tight preferably
by the application of red-lead. The lower end of core B receives a cheese headed
screw or bolt which screws into lower end of core B and its head end extends on
the outer face of brass cover a² and the upper end of core screws into an iron
cover which latter screws into upper end of cylinder A as shown Figs. 1 and 2
and through which the terminals + and pass.

page_text: Referring to Fig. 2 we arrange a soft iron cylinder 63 around the core B and
after the wire C is wound round the core B we wind it around the said cylinder b³
and arrange the terminals + and - as shown.
One end of said cylinder & preferably screws into the yoke or cover 62 and the
lower end screws into the cover a² as shown. We would have it understood that
our invention consists essentially in arranging an electro-magnet for use in
extracting broken drills from bore-holes and we therefore do not desire to claim
the mere use of an electro-magnet for any other purpose or any electro-magnet
per se but
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In an appliance for extracting broken drills from bore-holes the combination
of a soft iron core B having insulated wire C around the same with an outer
cylinder of soft iron A connected to said core by an iron yoke & and so arranged
that an electrical current may be forced through the wire C so converting said
appliance into an electro-magnet whereby it may be used in the manner
specified.
2. In an appliance used for and in the manner specified in addition to the
combination set forth in the preceding claim the use of an extended head & to
the core B for the purpose of creating a superior magnetic field and to facilitate
the fitting together of said appliance.
3. In an appliance used for and in the manner specified in addition to the
combination set forth in claim one aforesaid the use of an additional core or
cylinder arranged substantially as described and illustrated at Fig. 3 of the
accompanying drawings.
4. In an appliance such as described and claimed and used for the purpose
specified the use of a metallic or other tube T for the protection of the electric
conductors and substantially as described and illustrated at Fig. 1.
5. The use of an electro-magnet such as described for the purpose of extracting
broken drills from bore-holes.
Dated this 13th day of March 1896.
H. F. BOUGHTON,
Barnsley, Agent.