Improvements in and relating to Drilling and other similar Machines.
Year: 1898

page_text: Date of Application, 26th Mar., 1898
Complete Specification Left, 25th Oct., 1898—Accepted, 18th Feb., 18€9
PROVISIONAL SPECIFICATION.
Improvements in and relating to Drilling and other similar 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:-
The invention relates to drilling and other similar machines in which the drill
or tool has a screw feed in the forward or operative direction and in which a
quick return or withdrawal of the drill or tool is required.
The invention has for its object to provide means for effecting the ready dis-
engagement of the screw spindle so as to permit of the quick return or withdrawal
of the drill or tool, and to provide means for supporting the spindle drill or tool,
SO as to preclude the possibility of bending and consequent disorder of the
mechanism while in operation.
The invention consists in the provision of segmental wedges which operate to
cause the engagement of half nuts upon the feed screw spindle; and which have
their faces of a corresponding inclination to that of the backs of the half nuts,
so that on introduction or engagement of the wedges the half nuts shall be positively
maintained in gear with the screw; while the angle of the inclination of the
wedges is such that the disengagement of the nuts upon stress imposed on opera-
tion of the drill or tool is impossible.
The invention further consists in the provision of guide or supporting rods so
connected to the spindle drill or tool that they may receive its longitudinal
motion and be capable of sliding within fixed lugs, so that thereby lateral support
may be given to the extremity of the spindle or drill or tool so as to preclude the
possibility of bending thereof while in operation.
In carrying the invention into effect according to one design especially suitable
for hand machine drills commonly used in mines and quarries, a casing is provided
preferably integral with and at the extremity of the tubular sleeve or holder
through which the feed screw passes, such casing being so formed as to receive
two half nuts for the purpose of actuating the screwed spindle for feeding. Upon
the exterior of the tubular sleeve or holder, a double wedge lever is pivotted at
whose extremities are provided segmental wedges which are capable
of entering transversely within the casing in which the half nuts
slide, suitable slots being provided for the purpose. Such wedges have
an inclined or wedge surface preferably provided upon their opposing
inner sides while the back faces of the half nuts are also provided of a
corresponding inclination so that upon the introduction of the segmental wedges
into the casing, the half nuts will be caused to approach each other and to embrace
between them the screwed spindle, and be firmly maintained in their position of
ngagement as if integral, seeing that the faces of the wedges lie in close contact
with the back faces of the half nuts, while the outer faces of the wedges may
lie in contact with the interior faces of the casing. A spring of any suitable form

page_text: may be provided for maintaining the segmental wedges in their position of engage-
ment within the casing and when the drilling or boring has been completed and
it is desired to rapidly withdraw the drill or tool preparatory to restarting, the
segmental wedges are withdrawn to a sufficient extent to allow the thread of the
half nuts to clear the thread of the feed screw and thus permit its withdrawal
without the necessity of unscrewing.
In carrying the invention into effect according to another design the segmental
wedges may be extended to form a further wedge surface in opposite direction
and the half nuts may be provided with slots whose respective sides are tapered
in the same direction as the opposing wedge surface, so that the motion of the
wedge lever in one direction positively forces the half nuts on to the feed screw
while motion in the other direction positively withdraws the nuts from engagement
therewith.
The guide or supporting rods are arranged to move parallel to the direction of
the feed screw and are connected at their extremities to a plate or flange provided
upon the spindle, the spindle being capable of rotation within the plate or flange,
while the longitudinal movement thereof is communicated thereto, so that the
guide or supporting rods may move longitudinally with the spindle. Lugs or
brackets are provided preferably within the easing in which the half nuts are
provided and axial holes are provided through which the guide or supporting rods
may slide. By such an arrangement a support is given to the extremity of the
feed spindle that precludes the possibility of bending of the spindle and the
consequent disorder of the mechanism.
It is to be understood that automatic mechanism may be employed to withdraw
the nuts out of gear or to cause their engagement at any moment and to rapidly
withdraw or feed forward the spindle or tool, and this may be effected without
departing from the essential features of our invention as hereinbefore described.
It is further to be understood that our invention may be applied generally
to drilling and other similar machines though being applicable more particularly
to drilling or boring machines used in mining or quarrying.
Tad thigh are of Marvab 1898
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
Improvements in and relating to Drilling and other similar Machines.
We, LAURANCE WORTHINGTON and Joux SOAR, both of Bolsover Colliery,
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:-
The invention relates to drilling and other similar machines in which the drill
or tool has a screw feed in the forward or operative direction and in which a
quick return or withdrawal of the drill or tool is required.
The invention has for its object to provide means for effecting the ready dis-
engagement of the screw spindle so as to permit of the quick return or withdrawal
of the drill or tool, and to provide means for supporting the spindle drill or tool
so as to preclude the possibility of bending and consequent disorder of the
mechanism while in operation.
The invention consists in the provision of segmental wedges which operate to
cause the engagement of half nuts upon the feed screw spindle; and which have

page_text: their faces of a corresponding inclination to that of the backs of the half nuts,
so that on introduction or engagement of the wedges the half-nuts shall be positively
maintained in gear with the screw; while the angle of the inclination of the
wedges is such that the disengagement of the nuts upon stress imposed on opera-
tion of the drill or tool is impossible.
The invention further consists in the provision of guide or supporting rods se
connected to the spindle, drill or tool that they may receive its longitudinal
motion and be capable of sliding within fixed lugs, so that thereby lateral support
may be given to the extremity of the spindle or drill or tool so as to preclude the
possibility of bending thereof while in operation.
The invention is illustrated in the accompanying drawings in which,
Figure represents in sectional plan a hand machine drill commonly used in
mines and quarries, while,
Figure 2 represents an elevation of the casing employed to receive the two
half-nuts through which the feed screw passes.
Figure 3 is an end elevation of the double wedge pivotted lever employed to
maintain the half-nuts in engagement with the feed screw.
Figure 4 represents a plan of a modified form of hand machine drill in which
the feed screw is laterally supported, and,
Figure 5 is an end view of the tubular sleeve or holder shewn in Figure 4.
In carrying the invention into effect as illustrated in the accompanying drawings
in the application of the invention to a hand machine drill commonly used in
mines and quarries a casing A is provided screwed at the extremity of the tubular
sleeve or holder B through which the feed screw C passes, such casing A being
so formed as to receive two balf-nuts D D¹ for the purpose of embracing the screwed
spindle C so that thereby it may be caused to move longitudinally upon rotation
within such half-nuts. Upon the exterior of the tubular sleeve or holder Ba
double wedge lever E is pivotted at whose extremities are provided segmental
wedges e e which are capable of entering transversely within the casing A in
which the half-nuts 1) D₁ slide, suitable slots F F¹ being provided for the purpose.
Such wedges e e have their inclined or wedge surfaces preferably upon their
opposing inner sides while the back faces of the half-nuts D D are also provided
of a corresponding inclination so that upon the introduction of the segmental
wedges ee into the casing A the half nuts D D will be caused to approach each
other and to embrace between them the screwed spindle and be thereby firmly
maintained in their position of engagement seeing that the faces of the wedges
lie in close contact with the back faces of the half-nuts, the outer faces of the
wedges preferably lying also in contact with the interior faces of the casing. A
spring of any suitable form may be provided for maintaining the segmental
wedges e e in their position of engagement within the casing A and when drilling
or boring has been completed and it is desired to rapidly withdraw the drill or
tool C preparatory to restarting the segmental wedges e e are withdrawn to a
sufficient extent to allow the thread of the half-nuts to clear the thread of the
feed screw C and thus permit its withdrawal without the necessity of unscrewing.
The nuts D D¹ may be caused to separate on the wedges e e being withdrawn
from engagement therewith by such means as spiral springs G provided as
illustrated in Figure 1.
In carrying the invention into effect according to another design the segmental
wedges may be extended to form a further wedge surface in the opposite direction
and the half nuts may be provided with slots whose respective sides are tapered
or inclined in the same direction as the opposing wedge surface so that motion
of the wedge lever in one direction positively forces the half nuts on to the feed
screw while motion in the other direction positively withdraws the nuts from
engagement therewith.
As illustrated in Figure 4 the feed screw may be laterally supported by means
of guide rods H H¹ arranged to move parallel to the direction of the feed screw
and connected at their extremities to a plate or flange I provided upon the

page_text: spindle C, the spindle- C being capable of rotation within the plate or flange I
while the longitudinal movement thereof is communicated thereto, so that the
guide or supporting rods H H¹ may move longitudinally with the spindle. The
casing A is provided at its respective extremities with bored holes for the recep-
tion of the guide or supporting rods H H¹ the rods freely sliding therein. By
such an arrangement a support is given to the extremity of the feed spindle which
precludes the possibility of bending the spindle and the consequent disorder of
the mechanism. It is obvious that any number of guide or supporting rods may
be employed.
It is further to be understood that our invention may be applied generally to
drilling and other similar machines though being applicable more particularly
to drilling or boring machines used in mining and quarrying.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
1. A drilling or boring machine having the improvements herein before described
substantially as and for the purposes specified.
2. In a drilling or other similar machine the provision of segmental wedges so
arranged as to cause the engagement of half-nuts upon the feed screw spindle
the segmental wedges having their faces of a corresponding inclination to that
of the backs of the half nuts so that on introduction of the wedges into the casing
in which the half-nuts are contained the half nuts shall be put into and positively
maintained in gear with the screw substantially as hereinbefore described.
2. In a drilling or other similar machine means for laterally supporting the
extremity of the feed screw spindle consisting of guide or supporting rods sliding
within brackets provided upon the holder substantially as hereinbefore described.
4. A drilling or other similar machine substantially as hereinbefore described
with reference to Figures 1 to 3 of the accompanying drawings.
5. A drilling or other similar machine substantially as herein before described
with reference to Figure 4 of the drawings.
Dated this 24th day of Octal 1900
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.