Improvements in and relating to Drilling and other Machines.
Year: 1899

page_text: Date of Application, 29th Aug., 1899
Complete Specification Left, 30th Apr., 1900-Accepted, 7th July, 1900
PROVISIONAL SPECIFICATION.
Improvements in and relating to Drilling and other Machines.
We, LAURANCE WORTHINGTON and JOHN SOAR, both of Bolsover Colliery,
Bolsover, in the County of Derby, Engineers, do hereby declare the nature of this
invention to be as follows:-
This invention relates to drilling and other machines in which the tool or
drill has a screw feed in the forward or operative direction, and in which quick
return or withdrawal of the tool is permitted.
The object of the invention is to provide a simple and inexpensive construc-
tion, and to dispense with a screwed spindle in machines of this class, and to
obviate the trouble occasioned by the introduction of drills or tools of various
lengths as is usually required in working, and to so mount the machine as to
render the drill or tool capable of being withdrawn if the feed is excessive, or if
the tool clogs.
The invention consists in the provision upon the drill spindle of a worm wheel,
which operates in engagement with a rack provided in the frame, so that on
rotation of the drill spindle the drill or tool is fed forward. The rack is 80
mounted as to be capable of being readily disengaged from the worm wheel for
the purpose of effecting the return or withdrawal of the dull spindle and tool.
The drill spindle 18 preferably provided tubular or hollow, so as to permit of
the introduction of a dill or tool of relatively great length The spindle 18
provided at its extremity with a clamping device by means of which the drill or
tool may be engaged, and on the completion of one stiohe, the clamping device
may be disengaged, and the rack disengaged with the worm wheel upon the drill
spindle The drill spindle is thereupon drawn backward and the tool left in the
original position, being then clamped and fed forward further
The invention also consists in arranging the frame carrying the drill spindle
so as to be capable of rotation, when required that is when the feed is excessive
or the drill becomes clogged The revolving head or frame may be turned by
unfastening a milled nut or set screw, or other fastening device.
In carving the invention into effect, according to one design especially suit-
able for hand machine drills, commonly used in mines and quarries, the drill
spindle is provided upon a fiame in which two guide bais are provided for the
purpose of supporting the rear extremity of the spindle A guide plate 19
mounted transversely on the extremity of the spindle and engages with the guide
bars. A worm wheel is mounted and keyed, or otherwise secured to the extremity
of the drill spindle, beyond the guide plate, and is so disposed as to engage with
a toothed rack which is mounted beneath and parallel to the drill spindle This
rack may be provided with teeth on its upper and lower faces of different pitch,
or on each of its faces to correspond with worm wheels of different pitch that
are required when working upon different materials The rack is preferably
hinged or pivoted to one part of the frame and is secured to the other so as to
be capable of ready disconnection by such means as a pin or cotter or other such
device The drill or tool may be secured within the drill spindle by any suit-

page_text: able means, and a ratchet wheel provided capable of rotation by means of a hand
lever
Other means of operating the lever may, however, of course be provided
It is preferred to provide the drill spindle as tubular or hollow as and for the
purpose herein before described
D
1000
MARKS & CLERK,
18, Southampton Buildings, London, WC,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents.
Improvements in and relating to Drilling and other Machines.
We, LAURANCE WORTHINGTON and JoHN SOAR, both of 18, New Bolsover,
Bolsover, in the County of Derby, Engineers, 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 drilling and other machines in which a dull or tool
has a screw feed in the forward or operative direction, and in which a quick
return or withdrawal of the tool is desirable.
The object of this invention is to provide a simple and inexpensive construc-
tion, and to dispense with a screwed spindle in machines of this class, and to
obviate the trouble occasioned by the introduction of drills or tools of various
lengths, as is usually equned in working, and to so mount the machine as to
render the drills or tools capable of being withdrawn if the feed is excessive or
if the tool jams or clogs
This invention consists in providing upon the tool carrying spindle a worm
which operates in engagement with a worm rack provided in the frame and
parallel to the spindle, so that on the rotation of the tool caying spindle the
tool is fed forward. The woim 1ack 18 80 mounted as to be capable of being
readily disengaged from the woim for the purpose of effecting the withdrawal
of the tool carrying spindle and tool
The tool carrying spindle 16 preferably tubular oi hollow, so as to permit of
the introduction of tools of relatively great length The spindle is provided
at one extremity with a clamping device for securing the tool at any desired
position, and on the completion of one stroke of feed, the clamping device and
the worm lack may be disengaged, the tool spindle being then drawn back over
the tool. The tool is then clamped and is ready for another stroke of feed.
This invention further consists in arranging the frame carrying the tool carry-
ing spindle, so as to be capable of rotation when required, when the feed 18
excessive or the tool becomes clogged or jammed. The frame may be permitted
to revolve by unfastening a set screw or other fastening device
In carving the invention into effect according to one modification, especially
suitable for ratchet drills, commonly used in mines or quarries.
Figure 1 illustrates the drill in position for boring
Figure 2 illustrates a more detailed view of the drill shown in Figure 1 drawn
to a larger scale.
Figure 3 is a side elevation of Figure 2
Figure 4 18 an end elevation of Figure 3.
Figure 5 18 a section of the worm rack on the line A B of Figure 2
Referring to Figures 1 to 5, a is a hollow drill spindle which is free to rotate
in a collar which is attached to a rear plate w by two guide bars c which engage

page_text: a guide plate d, which supports the rear end of the spindle a. The parts b, w, o,
and e, constitute the frame of the machine A worm wheel e is mounted and
secured to the rear end of the drill spindle, beyond the guide plate d, and 18 80
disposed as to engage with a toothed woim rack f, which is mounted parallel to
and beneath the drill spindle. This rack may be provided with sets of teeth 9,
of different pitch on its upper and lower faces, each set corresponding with worms
of different pitch, such as are required when working on different materials
One end of the rack f 18 prefeiably hinged at h to the forward collar b the
other end being fixed at by means of a pin and cotter or any other such device,
to the real plate and capable of being readily disconnected when required
The plate is fastened by means of a set screw 7, to the supporting collar m;
the collar m being provided with trunnions o, o, which fit into the slots p, p of
a standard of the ordinary form. By this arrangement if the set screw is
slackened, the frame and the tack will revolve with the drill spindle, and thus
the feeding action will at once be stopped
The spindle a is fitted at its forward end with a ratchet device t of any ordinary
form which is situated close to a shoulder a. On the other side of the shoulder s,
is a tapered screwed portion which has transverse cuts u, such that when a
nut v 18 screwed on to r, the end of the spindle will converge sufficiently to clamp
the tool firmly.
It will be seen from the foregoing description and drawings that this ratchet
has several advantages A tool of relatively great length and sharpened at both
ends may be inserted from the back of the machine, and clamped in any desired
position, thus obviating the necessity of taking down the machine to insert
different lengths of drills
The tool may be quickly withdiawn when required, by unfastening the rack
at one end and drawing the spindle back. The feed may be immediately stopped
by slackening the set screw 1, thus allowing the frame and rack to revolve with
the spindle
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim 18:-
1. In machines in which tool carrying and feeding devices are employed; a
hollow tool carrying spindle provided with a clamping device, and a hollow
supporting colla, such that tools of relatively great length may be inserted from
behind the machine, and clamped in any desired position, substantially as heiein-
before described
2-In machines in which tool feeding devices are employed, a worm on the
tool carry ing spindle gearing with a hinged woim rack, which 18 capable of being
disengaged from the worm, to admit of the spindle being shifted to any desned
position, substantially as and for the purposes hereinbefore described.
3. In machines in which tool feeding devices are employed, the combination
of a spindle such as a, with a worm 1ack bar such as f, the said rack bar having
woim racks of various pitches, which are adapted to gear with suitable worms such
as e mounted on the aforesaid spindle, substantially as and for the purpose here-
in before described
4-In machines in which tool feeding devices are employed, the use of
various pitches of worm geaning with suitable racks, to give the variety of feed
necessary for working different materials, substantially as herein before described.
5. In machines in which tool feeding devices are employed a frame connected
to a supporting collar by means of a set pin or other such device, in such a
manner that when the device is slackened, the fiame is free to revolve with the
tool spindle, thus stopping the feed, and when the device is fastened the frame
as rigid with the supporting collar, and the tool can be fed forward substantially
as herein before described
6--In machines in which tool carrying and feeding devices are employed, in

page_text: combination, a hollow tool carrying spindle provided with a suitable tool clamp-
ing device and suitable means for 1otation, a frame carrying the said spindle, a
hollow colla supporting the said frame, a hinged rack adapted to gear with a
worm on the aforesaid spindle, the combination being adapted to allow of spindlo
being detached from the tool, drawn back, and again clamped to the tool, with-
out withdrawing the latter from the work, substantially as herein before described.
Dated the 27th der of April 1900
MARKS & CLERK,
18, Southampton Buildings, London, WC.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents.