Improvements in Machines for Drilling Rock, Coal, or other like Substances.
Year: 1898

page_text: Date of Application, 14th Nov., 1898-Accepted, 17th Dec., 1898
COMPLETE SPECIFICATION.
Improvements in Machines for Drilling Rock, Coal, or other like
Substances.
We, MARY ELLIOTT, of The Elms, Coal Aston, Dronfield, Widow, ALFRED
GEORGE ELLIOTT, also of The Elms aforesaid, Engineer, and ARTHUR FRY, of
No. 367, Chesterfield Road, Norton Woodseats, Sheffield, Dentist, being the
Executors named in the will of the late George William Elliott, formerly
of The Elms, Coal Aston aforesaid, Engineer, Deceased, 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:-
This invention relates to the class of machines for actuating auger shaped
drills as used in mines, it has for its object to increase the usefulness of such
machines, to render them more durable and to reduce the cost of manufacture.
The improvements are shown in and by the drawings hereunto annexed,
wherein Fig. 1 is a side elevation of the chief working parts of the machine, parts
being in section. Fig. 2 is an end view of same showing chuck device for holding
drill heads. Fig. 3, is a section of other or socket end as on line a, b, being the
means for obtaining a variable feed motion by the screw spindle. Fig. 4, is a
cross section on line c, d, illustrating a device for operating the component parts
of a divided nut corresponding to the said screw. Fig. 5 illustrates also partly
by section a different form of construction suitable for a half nut. Fig. 6 is a
cross section of the same as on line e, f, all these last three figures are drawn
to a larger scale for the sake of clearness, while certain well known parts necessary
to a complete machine are omitted, such parts not being affected by the present
improvements.
For a machine we construct a case or body A, Fig. 1, through which the usual
spindle S works freely, the front end of this spindle is reduced slightly below
the diameter of the bottom of the screw thread to form a bearing or journal for
the reception of the socket part of the nozzle or head piece B, to the body of
which is secured one or more ratchet wheels W, which, by means of lever handle
not shown, transmit intermittent rotary motion to the drill inserted in the end
of nozzle B, the internal opening, as will be seen from Fig. 2, is shaped to receive
not only the usual square head of a drill, but is equally adapted for holding a
head of flat section, thus being more suitable for auger shaped drills commonly
twisted out of flat steel, the head B, may be retained upon spindle S by means of
a ping, passing through side of socket one end or side working freely in a
groove h, formed in the spindle to correspond, and a flat disc of hardened steel i,
is fitted loosely in the bottom of the socket to receive the necessary pressure in
working, further it will be seen that the socket is split open for a considerable
portion of one of its sides between a pair of lugs or projections D, into which is
fitted a hand screw E, thus providing easy means for more or less tightly closing
the socket upon the end of the spindle, whereby the screw spindle will be made
to rotate with the socket so long as the pressure resulting from the travel of the

page_text: screw does not exceed the capacity of the drill to penetrate the material, but
whenever such end pressure becomes excessive then the spindle will remain
stationary in the socket until the balance of friction is restored by the cutting
operation of the drill whereupon the feed is automatically resumed.
In practice it is found necessary to also provide means for engaging and dis-
engaging the nut or its equivalent from the screw thereby saving time and
unnecessary wear. We will now describe means to attain these objects beginning
with the device for applying and operating a divided nut which when closed
practically encloses the screw, the body A, through which the screw S, slides
freely is internally formed as a box within which slide the component parts F, G,
of a divided nut each of which has a downward projection H having thereon
rack teeth, see Fig. 4, into which the teeth of a pinion, I, engage on opposite sides
diametrically, said pinion may be integral with or be fixed upon a pivot P.
journalled in bearings formed in A, then by a partial rotation by means of lever J,
fixed on P, outside of case A, the two parts of nut F and Gare moved simul-
taneously to or from the screw as may be required.
Where only a half nut is desired the length of nut is considerably increased
as in Fig. 5 where K is the body to receive the screw S, therein an open bottom
case is made extending downward in which a half nut N slides, the inside of this
nut has a longitudinal opening M, within which is a roller X having pivot
openings or bearings formed excentrically into which pivot pins 0, 01, enter from
body K, a lever L may be placed or formed upon said roller at any convenient
part which enables a partial rotation to be imparted to the excentric roller X
whereby the nut is instantaneously and effectually engaged or disengaged. In
this case also the adjustable feed may be obtained by means described by reference
to Fig. 1, but not again repeated or shown.
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:-
1st. In a rock drilling machine a compound head consisting of a nozzle capable
of holding either a square or flat headed drill having ratchet wheel thereon near
its centre and a split socket at its other extremity with a screw clamp to cause
the said socket to grip the plain end of a screw spindle sufficiently thereby to
produce an adjustable automatic feed motion from the occasional or partial
revolution of the screw within a fixed nut, as specified and set forth.
2nd. In a rock drilling machine the combination of parts shown and consti-
tuting a split nut the two parts whereof are caused to engage with or disengage
from a screw spindle by means of a rack forming part of each half nut both being
moved simultaneously by the teeth of a pinion journalled between said racks, all
substantially as herein described and illustrated.
3rd. In a rock drilling machine the combination therewith of a device con-
sisting of a half nut actuated for engaging with or disengaging from a screw
spindle by means of the partial rotation of a roller upon bearings fixed or formed
excentrically to its own axis, substantially as described and illustrated.
Dated this 12th day of November 1898
ISAAC BECK, F.S.P.A.,
Agent for the Applicants,
Haymarket Chambers, 17, Haymarket, Sheffield.