improved Method of and Apparatus for Cutting Chases for Getting Coal and other Mineral.
Year: 1891

page_text: Date of Application, 27th June, 1891
Complete Specification Left, 22nd Mar., 1892-Accepted, 23rd Apr., 1892
PROVISIONAL SPECIFICATION.
improved Method of and Apparatus for Cutting Chases for Getting
Coal and other Mineral.
I, WILLIAM WALKER of "The Hawthorns" Saltburn-by-the-Sea, in the
County of Yorkshire, Mining Engineer, do hereby declare the nature of this
invention to be as follows:—
My invention relates to improved method of and apparatus for cutting chases in
the face of a working for getting coal or other mineral whereby such chases are
formed by cutting a number of drill holes so close side by side that they cut into
each other and thus form a continuous chase. For this purpose 1 first drill a hole
in the face of the working in the ordinary manner of any desired depth, and into
this hole 1 insert a tube fitting the hole as nearly as possible with the exception
of one side where it is formed with a flat or inward curved surface situated a
certain distance away from the drill hole, and in this surface I form a longitudinal
slot.
This guide tube projects a certain distance out from the face of the working,
and into the open end of the slot I introduce a rib projecting from the side of a
second tube, the rib having flanges fitting against the inner and outer surfaces of
the slot, so that the second tube while sliding alongside of the guide tube, is
effectually held in a definite position thereby. Within the second tube fits the
stem of a rotating drill, the cutting head of which projects beyond the tube and
which is of such a size as to form a drill-hole that will cut into the side of the first
drill hole containing the guide tube. As the drilling proceeds, the tube with the
drill moves inwards the lateral rib of the tube that is guided by the guide tube
being made to pass down the opening that connects the two drill holes.
second drill hole has been carried to the requisite depth the tube and drill are
withdrawn, and the guide tube is also withdrawn from the first drill hole and is
now placed in the second one whereupon the drilling of a third hole is proceeded
with in the same manner as above described and so on until the required length of
chase has been produced.
When the
For removing the debris from the drill hole, the stem of the drill is formed
twisted or with helical grooves in such a direction that on the rotation of the drill
the debris are made to travel back in them to the outlet holes provided at the
outer end of the tube.
Instead of forming the guide for the drill tube as a slotted tube as described; it
may consist of a rod having a disc fitting the drill hole at its inner end and held
centrally in the drill hole by any suitable support at its outer end.
The rib of the drill tube is in that case provided with an eye that slides along
the rod.
Dated this 27th day of June 1891.
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improved Method of and Apparatus for Cutting Chases for Getting
Coal and other Mineral.
1, WILLIAM WALKER, of "The Hawthorns," Saltburn-by-the-Sea, in the
County of York, Mining 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:—
My invention relates to an improved method of and apparatus for cutting chases
in the face of a working for getting coal or other mineral, whereby such chases are
formed by cutting a number of drill holes so close side by side that they cut into
each other and thus form a continuous chase. For this purpose I first drill a hole
in the face of the working in the ordinary manner of any desired depth, and into
this hole I insert a tube fitting the hole as nearly as possible with the exception of
one side where it is formed with a flat or inward curved surface situated a certain
distance away from the drill hole, and in this surface I form a longitudinal
slot.
This guide tube projects a certain distance out from the face of the working, and
into the open end of the slot I introduce a rib projecting from the side of a second
tube, the rib having flanges fitting against the inner and outer surfaces of the slot,
so that the second tube, while sliding alongside of the guide tube, is effectually
held in a definite position thereby.
Within the second tube fits the stem of a rotating drill, the cutting head of which
projects beyond the tube and which is of such a size as to form a drill hole that
will cut into the side of the first drill hole containing the guide tube. As the
drilling proceeds, the tube with the drill moves inwards, the lateral rib of the tube
that is guided by the guide tube being made to pass down the opening that connects
the two drill holes. When the second drill hole has been carried to the requisite
depth, the tube and drill are withdrawn, and the guide tube is also withdrawn from
the first drill hole and is now placed in the second one, whereupon the drilling of a
third hole is proceeded with in the same manner as above described, and so on,
until the required length of chase has been produced.
For removing the debris from the drill hole, the sten of the drill is formed
twisted or with helical grooves in such a direction that on the rotation of the
drill the debris are made to travel back in them to the outlet holes provided
at the outer end of the tube.
On the accompanying drawings is shewn the mode of carrying out my before
described invention.
Fig. 1 shews a sectional plan of a working with a drilling machine and drili in
position for cutting a chase in the face of the working.
Fig. 2 is a part elevation shewing one line of holes A already drilled in the face
at bottom and a second line B in the course of being drilled at a higher level.
Figs. 3 and 4 shew an enlarged plan and cross section of the slotted guide tube.
Figs. 5 and 6 shew a plan and end view of the drill with its tube, and
Fig. 7 shews a cross section of the guide tube, drill and drill tube in position in
the cutting.
Referring to Fig. 1, a hole is in the first instance drilled in the working in the
left hand corner in the ordinary manner by the drilling machine C, which is of
known construction, and into this hole is then introduced the guide tube D.
This tube is made of such a diameter as to fit the hole as closely as practicable,
with the exception of one side portion d, which is formed with a flat face, in which
is formed a longitudinal slot d'. The tube D is of such a length as to project out a
certain distance beyond the bore hole, as shewn at Fig. 1, the slotted face being
presented on the side on which it is desired to cut the next drill hole. A drill E is
inserted into a tube F and attached to the drill shaft G of the machine; the tube F

page_text: has a longitudinal grooved rib on one side thereof, which is inserted into the slot
of the projecting end of the guide tube D. This tube is by preference provided
with a filling d of wood or other suitable material having a groove opposite the
slot d of such a depth that the face of the rib f will bear against the bottom
thereof and thus prevent undue pressure being exerted upon the thin flat edges d
of the tube on each side of the slot.
The tube F being thus effectually guided by means of the guide tube D as the
drilling proceeds, a second hole will be drilled in a correct position parallel to the
first one, the debris of the cutting being conveyed backward out of the tube by
means of the helically twisted stem of the drill.
The drill cutter is made to project sufficiently beyond the outer diameter of the
tube F to allow this to pass freely down the drill hole as the drilling proceeds, and
to cause the hole when cut to intersect the previously formed hole X as shewn at
Fig. 7.
The hole being completed, the drill and its tube are withdrawn and the guide
tube is removed from the first hole and placed in the second one.
The drilling machine A is then shifted sufficiently to bring the drill tube Fin
position to engage with the slot of the guide tube D again and the drilling of the
next hole is then proceeded with, and so on.
For regulating the exact extent to which the drilling machine has to be shifted
for each successive boring, the wheels of the carriage are by preference formed
with ratchet discs H with which engage pawls I, the ratchet teeth being made of
such a pitch that the carriage will be brought into correct position on moving it so
that the pawls pass from one tooth space to the next one. The two ratchet lises
with their pawls are arranged in opposite directions so that the one pair always
acts as a locking rachet and pawl, after the carriage has been moved.
The frame of the drill being pivotted on the carriage it will be seen that vertical
or inclined chases may be cut by the above described method, as well as horizontal
ones.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. The method of cutting a number of drill holes in coal or other mineral so
closely side by side as to intersect each other and thus form a continuous chase, by
introducing into one hole a tube or equivalent device that serves as a guide for a
tube carrying the drill when drilling the next hole, substantially as described.
2. The use for cutting chases in the manner set forth in the preceding claim, of a
tube adapted to fit into a drill hole and having a slot or longitudinal guide, for
guiding a tube containing the drill while this is drilling the next hole, substantially
as described.
3. The use for cutting chases in the manner set forth in the preceding claims, of
a tube fitted over the drill for drilling the holes and having a longitudinal grooved
rib adapted to fit into and slide along the slot of the guide tube during the drilling
of a hole, substantially as described.
4. In drilling apparatus for getting coal and other minerals, the combination of
a slotted guide tube D, a drill E with twisted stem, and a tube F fitting over the
drill and adapted to slide with a rib f in the slot of the guide tube, substantially as
described.
Dated this 21st day of March 1892.
ABEL & IMRAY,
Agents for the Applicant.