IMPROVEMENTS IN APPARATUS FOR DRILLING HOLES IN COAL AND OTHER MINERALS
Year: 1884

page_text: We THOMAS WARDLE ASQUITH and ROBERT EMBLETON ORNSBY both of Seaton
Delaval in the County of Northumberland, Mining Engineers do hereby declare
the nature of the said Invention for IMPROVEMENTS IN APPARATUS FOR DRILLING
HOLES IN COAL AND OTHER MINERALS to be as follows:
This Invention relates to an improved apparatus for drilling round smooth and
straight holes in coal and stone of various diameters suited for compressed and
other cartridges plugs and wedges.
The improvements relate 1st To an improved standard consisting of a double
telescope legs the object of which is to ensure steadiness and stability and to
prevent any yielding to the back pressure occasioned by the material being
operated upon and transmitted back by the drill and screw, and also to enable the
operator to fix the legs between the roof and floor quickly and with ease.
2nd A pair of cheek plates adapted to embrace, the telescope legs and he
moveable upon them and in which is mounted the gear for transmitting motion to
the screwed drill spindle which may be actuated either by two alternately acting
ratchet levers or by two ordinary crank handles. The object of this part of the
Invention is to enable the operator (after having fixed the legs) to fix the drill and
screw worm immediately opposite any point where a hole is required to be drilled
and to enable him to turn the screw worm when the end of it is in close proximity
to the pillaring in the long wall or roof supports &c.
3rd To an improved overlapping screw box or nut made in two parts jointed
together and placed upon two studs or pins projecting from the front side of the
chest. This improved box when opened allows the screw to be drawn quickly
back thereby obviating the necessity of reversing the screw or the delay caused
by running a nut back to the end.
.
4th To an improved construction of drill the object of which is to drill round
smooth and straight holes.
The standard consists of a pair of telescopic legs adjustable by means of clamping
screws and united by cross bars and provided with means of fixing them firmly to
the floor and roof. The cheek plates are so formed as to embrace the legs and are
clamped together thereon by bolts. In bearings in these plates and between the
legs is mounted the gear for driving the screw and drill, consisting of two toothed
wheels through one of which passes the screwed drill spindle the wheel and screw
being caused by groove and feather connections to turn together whilst leaving

page_text: the spindle free to slide through the wheel The other wheel gears with the first
and is actuated by a pair of ratchet levers on opposite ends of its spindle.
The screwed drill spindle works through a screw box or nut made in halves
hinged together upon a prolongation of one of the clamping bolts of the cheek
plates and embracing the screw and likewise a prolongation of the other clamping
bolt so as to be prevented from turning whilst admitting of throwing back and
disengaging both halves from the screw to allow the latter to be slid back freely
when required. The box is provided with means of locking the halves together
and is situated outside the cheek plates by which it is carried and immediately
adjacent thereto.
Instead of wheels gearing directly together and operated by ratchet levers the
wheels may be geared together by an endless chain and turned by ordinary crank
handles. In this case the wheels would be mounted in separate pairs of clamping
cheek plates kept apart by an adjustable distance piece.
The drill itself which is adapted for boring smooth holes of say 5 inches
diameter and under, consists of a short small advancing drill spiral.or thread which
acts as a conductor to the following cutters which are partly inclined or oblique to
the axis of the drill and partly parallel thereto and act both as cutters and reamers
forming smooth round straight holes suitable for receiving wedges plugs or
compressed and other cartridges.
We THOMAS WARDLE ASQUITH and ROBERT EMBLETON ORNSBY both of Seaton.
Delaval, in the County of Northumberland, Mining Engineers do hereby declare
the nature of our Invention for "IMPROVEMENTS IN APPARATUS FOR DRILLING.
HOLES IN COAL AND OTHER MINERALS" and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
-
This Invention relates to an improved apparatus for drilling round, smooth,
straight, and level holes in coal and stone, of various diameters, suited for
compressed and other cartridges, plugs and wedges.
The improvements relate 1st To an improved standard, consisting of a pair of
telescope legs, the object of which is to ensure steadiness and stability and to
prevent any yielding to the back pressure occasioned by the resistance of the
material being operated upon and transmitted back by the drill and screw, and
also to enable the operator to fix the legs between the roof and floor quickly and
with ease.

page_text: 2 To a chest formed of a pair of cheek plates adapted to embrace the telescope
legs and be moveable upon them and in which is mounted the gear for transmitting
motion to the screwed drill spindle.
The object of this part of the Invention is to enable the operator (after having
fixed the legs) to fix the drill and screw worm immediately opposite any point
where a hole is required to be drilled and to enable him to turn the screw worm
when the end of it is in close proximity to the pillaring in the long wall, roof
supports or other obstacles &°.
3 To an improved overlapping screw box or nut made in two parts jointed.
together and placed upon two studs or pins projecting from the front side of the
chest. This improved box when opened allows the screw to be drawn quickly back
thereby obviating the necessity of reversing the screw or the delay caused by
running a nut back to the end.
4th To an improved construction of drill, the object of which is to drill round,
smooth, and straight holes.
In order that the Invention may be more readily understood, we have illustrated
it in the accompanying Drawings and will proceed to describe it with reference
thereto.
Figure 1 is a vertical section and Figure 2 a side elevation of the apparatus.
Figure 3 is a horizontal section of the same in the plane of the screw axis, the
screw being omitted. Figure 4 is a side view of the screw box separately..
Figures 5 and 6 are elevations showing an endless chain driving gear. The same
letters of reference indicate corresponding parts in all these Figures. The standard
consists of a pair of tubular telescopic legs A, A, A1, A¹, the parts A, A¹ being"
connected and adjusted by means of clamping screws and braced together by cross
bars at top and bottom provided with the usual means of fixing them firmly to the
floor and roof. B are the cheek plates formed with curved jaws adapted to
embrace the legs A as shown in Figure 3 and be clamped together thereon by
lugs C. D is a gear wheel having its bosses or journals mounted in bearings cast
in the cheek plates B and between the legs A; E is the screwed drill spindle
sliding freely through the boss of wheel D but caused to turn therewith by two
internal feathers d in the boss of the wheel received in longitudinal grooves e in
the screw spindle. The screw spindle works through a screw box or nut F made
in halves hinged together and carried alongside one of the cheek plates B by a pair
of projecting studs or pins O screwed into the cheek plate, the parts of the screw
box being hinged upon one of these pins and embracing the other so as to be
prevented from turning whilst being free to be thrown apart and disengaged from
the screw as shown in Figure 4, to allow the screw to be slid back freely when
required. The halves of the screw box embrace and engage with the screw as
shown in Figures 1 and 4 and are locked together when in work by a staple f and
cross pin as shown in dotted lines Figure 3. In Figures 1, 2, 3, G is a second
toothed wheel gearing directly with wheel D and also mounted in bearings formed
in the cheek plates B. It is actuated by a pair of levers and ratchets H, h at
opposite sides of frame A engaging with ratchet wheels I on the squared projecting
ends of its spindle the ratchet levers turning on collars thereon. This gearing is
entirely boxed in by the cheek plates B and by top and bottom cover plates K
secured thereto.
In Figures 5 and 6 the wheels D and G are connected by an ordinary endless
chain or band the wheel G being in this case mounted on a separate pair of cheek
plates B¹ secured to the telescopic legs the two pairs of cheek plates being kept at
the required distance apart by a strut L having right and left handed screws at its
ends screwing into cross pieces bearing against the pairs of cheeks B B'. In this
case the wheel G is turned by ordinary crank handles M.
The drill itself is shown in Figure 1. It is adapted for boring smooth holes of
say 5 inches diameter and under, and consists of a short snall advancing drill
spiral or thread n which acts as a conductor to the following cutters o opp of
which the former are inclined or oblique to the axis of the drill and the latter are

page_text: parallel thereto and act both as cutters and reamers, forming smooth round straight
holes suitable for receiving wedges plugs or compressed and other cartridges.
The twist portion N of the drill is the same as usual and it has a squared tang.
received in a corresponding socket on the end of the screw spindle E.
In fixing the apparatus for operation, the legs A A' are drawn out to the required
length and secured by the setscrews a. The legs are then fixed firmly to the roof
and floor by turning the screw point which works through a nut in the lower
cross bar. When the holes are required to be drilled at an angle, the apparatus is.
fixed a little from the vertical and when the holes are to be drilled near the floor
the apparatus may be inverted.
Having now particularly described and ascertained the nature of our said
Invention, and in what manner the same is to be performed, We declare that
what we claim is:
1 In a machine for drilling, coal and other minerals, the combination with a
double standard as herein described, of a pair of cheek plates adapted to be
clamped upon the said standard and to hold the gear by which the drill spindle is
driven between them, substantially as shown and described.
2nd In a machine for drilling coal and other minerals, the combination
substantially as herein described, of the double standard, the cheek plates
embracing the same, a gear wheel mounted therein, a screw spindle passing
through said wheel with a groove and feather connection and a screw box in two
parts hinged together and connected to the one cheek plate, substantially as shown.
and described.
3rd The combination and arrangement of the double standard, cheek plates, gear
wheels, ratchet levers or crank handles, screw spindle and screw box, substantially
as described and shown in the Drawings.
4th In a drill for coal and other mineral, the combination of a pair of cutting
edges inclined to the drill axis and of a pair of cutting edges parallel to said axis
substantially as herein described and shown in Figure 1 of the Drawings in
combination with a small advancing spiral n and a following spiral N as specified.
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