Improvements in Apparatus for Cutting Chases for Getting Coal and other Minerals.
Year: 1893

page_text: Date of Application, 6th Dec., 1893
Complete Specification Left, 31st Aug.. 1894-Accepted, 6th Oct.. 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting Chases for Getting Coal
and other Minerals.
I, WILLIAM WALKER, of Hawthorn House, Saltburn by the Sea, in the County
of York, Mining Engineer, do hereby declare the nature of this invention to be
as follows:-
My invention relates to apparatus for cutting chases in coal and other mineral
wherein such chases are formed in the face of a working by cutting a number of
drill-holes closely side by side.
In the Specification to my Patent No. 10981º I described an arrangement in
which such holes were enabled to be cut so close together as to intersect each other,
by the use of guide tubes fitted into the holes previously cut.
According to one of my present improvements I dispense with the necessity of
the guide tubes by so constructing and arranging the threaded drill bar of the
apparatus that it, itself, constitutes the twisted drill, having a cutter head fitted
on its end, instead of employing a separate twisted drill connected to the drilling
bar by a universal joint, as heretofore.
For this purpose, instead of making the drill bar with several screw threads of
quick pitch which lie close together, 1 construct it with only a single such quick
thread, so that considerable spaces occur between its convolutions, making it
resemble in form the twisted drill.
The nut in the machine by the rotation of which the advancement of the spindle
is regulated is formed with a corresponding single thread. By this arrangement.
the drilling machine is enabled to be placed much closer to the face of the working
than heretofore, as the space between it and the face, corresponding to the length
of the separate twisted drill hitherto used, is no longer required, while by the
rigidity possessed by the strong drill bar, and by the considerable length of the
hollow shaft through which the drill bar passes, and which both rotates it and
guides it in its motion, the drill bar can be made to exercise its drilling action
without experiencing any lateral deflection, so that it can cut the drill holes so
close together as to intersect each other, with the same precision as was obtained
by the use of the before mentioned guide tubes, but with much greater expedition.
The drill bar is suitably formed with sockets at either end for the reception of
a cutter.
Another of my present improvements relates to the construction of the framing
carrying the drilling apparatus, and the means for operating and advancing the
same in the working.
I provide a wrought iron or steel plate of suitable size such as 4 ft. by 2 ft. and
in. thick, which has holes on its edges for securing it by spikes or other means
on the floor of the working, and along the middle of this plate I fix a toothed rack
having by preference dovetail or undercut sides. Upon this plate place the
framing that carries the drill, the base of which framing has a dovetail groove
adapted to fit over the said rack, and in gear with the latter is a toothed pinion
carried by the framing and rotated by suitable gearing, so that by this means the
framing can be slid along the plate into any required position in front of the face
of the working. For wider workings, extension plates with racks may be connected
to the ends of the said plate, by means of dovetail joints or otherwise, and be
secured to the ground in like manner by spikes &c.
The upper part of the framing which carries the drilling machine consists of a
vertical column on which slides a sleeve having a cranked arm with an eye at the

page_text: end adapted to carry the drilling machine in a similar manner to that described in
the Specification to my Patent 114728.
The sleeve is preferably made in two halves secured together by bolts or flanges,
and it embraces a loose rack bar that is placed up against the side of the column,
being held in position by the sleeve, which carries a pinion in gear with the rack
and rotated by suitable worm and worm wheel gear for raising or lowering the
sleeve upon the column so as to bring the drilling machine to the exact height
required in front of the face of the working.
The column is made to extend to the full height of the working, and it is con-
structed of two separate lengths, as is also the rack, the upper length being fitted
to the lower part by means of dowel pins or other suitable fastenings that will
allow of its being detached when the drilling apparatus is required to be removed
to another working. For facilitating such removal, I fix on the underside of the
before mentioned base plate with rack, two transverse bars, having axle-ends
projecting beyond the sides of the plate, so that if, after removal of the top part of
the column, the framing with the base plate be canted up sufficiently on one side,
the axles on that side will be raised to a height enabling tram-wheels to be fitted
thereon, so that on then raising the machine at the other side, wheels can also be
fitted on the other axles, and thus a carriage be constituted whereby the machine
can be readily conveyed to another working.
Dated this 6th day of December 1893.
ABEL & IMKAY,
Agents for Applicant.
Improvements in Apparatus for Cutting Chases for Getting Coal
and other Minerals.
1, WILLIAM WALKER, of Hawthorn House, 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 apparatus for cutting chases in coal and other mineral
wherein such chases are formed in the face of a working by cutting a number of
drill-holes closely side by side.
In the Specification to my Patent No. 10981" I described an arrangement in
which such holes were enabled to be cut so close together as to intersect each other,
by the use of guide tubes fitted into the holes previously cut.
According to one of my present improvements I dispense with the necessity of
the guide tubes by so constructing and arranging the threaded drill bar of the
apparatus that it, itself, constitutes the twisted drill, having a cutter head fitted on
its end instead of employing a separate twisted drill connected to the drilling bar
by a universal joint, as heretofore.
For this purpose, instead of making the drill bar with several screw threads of
quick pitch which lie close together, I construct it with only a single such quick
thread, so that considerable spaces occur between its convolutions, making it
resemble in form the twisted drill.
The nut in the machine by the rotation of which the advancement of the
spindle is regulated is formed with a corresponding single thread. By this
arrangement the drilling machine is enabled to be placed much closer to the face
of the working than heretofore, as the space between it and the face, corresponding
to the length of the separate twisted drill hitherto used, is no longer required,
while by the rigidity possessed by the strong drill bar, and by the considerable
length of the hollow shaft through which the drill bar passes, and which both
rotates it and guides it in its motion, the drill bar can be made to exercise its drilling

page_text: cutter.
Another of my present improvements relates to the construction of the framing"
carrying the drilling apparatus and the means for operating and advancing the
same in the working.
I will proceed to describe with reference to the accompanying drawings in
which
Fig. 1 shews the before described improved form of drill spindle,
Fig. 2 is a side elevation of the carriage,
Fig. 3 an end elevation and Fig. 4 a plan.
The drill bar A has a single thread of quick pitch and serves both as the drill
bar and the twisted drill; it may be considered as the usual drill bar, such as is
shown at A Fig. 14 which has three threads of quick pitch, two of which are
removed. The nut of the machine is made with a corresponding single thread of
quick pitch.
The universal joint B which connects the ordinary drill bar to the twisted drill C
is dispensed with, and the cutter head D is fixed in a socket formed in the end of
the drill bar A.
The carriage at Figs. 2, 3 and 4 is constructed as follows:
A wrought iron or steel plate E, of suitable size such as 4 ft. by 2 ft. and in.
thick, which has holes E' on its edges for securing it by spikes or other means on
the floor of the working and along the middle of this plate I fix a toothed rack F
having by preference dovetail or undercut sides as shewn. Upon this plate I place
the framing that carries the drill, the base G of which framing has a dovetail
groove adapted to fit over the said rack and in gear with the latter is a toothed
pinion H carried by the framing and rotated by suitable gearing H', so that by this
means the framing can be slid along the plate into any required position in front
of the face of the working. For facilitating such motion, antifriction rollers are
provided on the framing at T T. For wider workings, extension plates with racks
may be connected to the ends of the said plate E by means of dovetail joints E³ or
otherwise and be secured to the ground in like manner by spikes &c.
The upper part of the framing which carries the drilling machine consists of a
vertical column on which slides a sleeve J having a cranked arm O with an
eye O' at the end adapted to carry the drilling machine in a similar manner to that
described in the Specification to my Patent 1147289 the drilling machine being of
any suitable known construction, driven either by steam, compressed air, electrical
energy or water under pressure.
The sleeve J is preferably made in two halves as shewn secured together by bolts
or flanges, and it embraces a loose rack bar K that is placed up against the side of
the column I, being held in position partly by the sleeve and partly by a stud K'
entering a circular groove I round the column. The sleeve carries a pinion L in
gear with the rack and rotated by suitable worm and worm wheel gear M N for
raising or lowering the sleeve upon the column so as to bring the drilling machine
to the exact height required in front of the face of the working. For preventing
undue friction between the sleeve and the column I provide antifriction rollers
at S S on the sleeve.
The column is made to extend to the full height of the working, and it is
constructed of two separate lengths I and I', and the rack is in like manner made
of two lengths K K'. The upper length 1 of the column is connected to the
lower length by means of lugs I projecting down into I and secured thereto by a
countersunk screw P, while the upper length of rack K' fits with a dowel pin into
the end of the lower length, and has near its upper end a stud K³ fitting into a
circular groove l' in 1'.

page_text: These fastenings will allow of the two upper parts being detached when the
drilling apparatus is required to be removed to another working. For facilitating
such removal, I fix on the underside of the before mentioned base plate with rack
two transverse bars, having axle-ends Q projecting beyond the sides of the plate,
so that if after removal of the top part of the column, the framing with the base
plate be canted up sufficiently on one side, the axles on that side will be raised to
a height enabling tram wheels R to be fitted thereon, so that on then raising the
machine at the other side, wheels can also be fitted on the other axles, and thus a
carriage be constituted whereby the machine can be readily conveyed to another
working.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In apparatus for drilling holes in coal and other minerals, adapting the
threaded drill bar to serve as the twisted drill by forming it with a single screw
thread of a quick pitch, and fixing the cutter head directly on the end thereof
substantially as described.
2. In the framing of a rock drilling apparatus the combination of a plate such
as E adapted to be fixed to the ground and also provided with means for attaching
wheels thereto for transport, a rack bar F of dovetail or undercut cross section
fixed to the base plate E, a sliding base G fitting with a dovetail groove on the
rack bar, and carrying a pinion gearing therewith, a column I with loose. vertical
rack bar K carried by the base G, and a sleeve J carrying the drilling machine
arranged to slide upon the column and having a pinion gearing with the rack bar,
arranged and operating substantially as described.
3. In a drill framing such as is referred to in the preceding claim, constructing
the column I and rack bar of two separate detachable parts of which the upper
part can be removed when the machine is to be transported, substantially as
described.
Dated this 31st day of August 1894.
ABEL & IMRAY,
Agents for Applicant.