Improvements in Boring and Drilling Apparatus.
Year: 1892

page_text: Date of Application, 30th Mar., 1892
Complete Specification Left, 3rd Oct., 1892-Accepted, 26th Nov., 1892
PROVISIONAL SPECIFICATION.
Improvements in Boring and Drilling Apparatus.
We, THOMAS NUTTER of 32 Manchester Road, and WILLIAM NUTTER of
6 Shackerley Road, both in Tyldesley in the County of Lancaster, Engineers, do
hereby declare the nature of this invention to be as follows:-
This invention relates to apparatus for boring and drilling, and its object is to
communicate the rotary motion to the boring or drilling tool in such a manner that
should this tool encounter any obstruction or resistance to its normal progress, the
motion will cease to be communicated to it.
In carrying out our invention we form a collar at one end of the spindle of the
apparatus and arrange around the spindle an externally screwed sleeve. One end
of this sleeve abuts against or upon the collar and the contact surfaces are so
formed and constructed that the spindle may be rotated by the friction contact with
the sleeve. At the opposite end of the screwed sleeve there is a friction clutch or
device through which the desired rotary motion may be imparted to the sleeve.
The amount of friction between the friction surfaces is regulated and adjusted by a
screw formed on the outer end of the spindle on which there is a nut abutting
against the outer part of the friction clutch or device, so that when the nut is
tightened the friction will be increased, and the reverse. The friction clutch or
device at the end of the apparatus further from the tool, consists of two parts, one
of which is formed or secured on the end of the screwed sleeve the other being the
part through which rotary motion is communicated to the apparatus. The means
for communicating this motion may be the same as in a ratchet drill, or continuous
motion may be imparted from any suitable source by ordinary gearing.
screwed sleeve works in a suitable feed nut mounted in a stand or otherwise, so as to
be incapable of rotation. This nut is preferably constructed in halves, or similarly
to the nut of the leading screw of a lathe, so as to enable the apparatus to be run
back quickly when it has reached the end of its stroke.
The
Sinoc the rotary motion is communicated to the tool through two frictional
driving surfaces, it will be evident that in the event of the tool encountering any
resistance not provided for, these surfaces or one of them will slip and the motion
will consequently cease to he transmitted to the tool. The adjustment of the
friction by means of the screw and nut is readily effected to a great degree of nicety
for the purpose of securing the transmission of the motion for ordinary work, and
slip for an extraordinary amount of work or unusual resistance.
Dated this 29th day of March A.D. 1892.
WILLIAM E. HEYS,
Agent for the Applicants.
COMPLETE SPECIFICATION.
'Improvements in Boring and Drilling Apparatus.
We, THOMAS NUTTER, of 32 Manchester Road, and WILLIAM NUTTER, of
62 'Shackerley Road, both in Tyldesley in the County of Lancaster, 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 apparatus for boring and drilling, and its object is to
communicate the rotary motion to the boring or drilling tool in such a manner that

page_text: should this tool encounter any obstruction or resistance, the motion will cease to be
communicated to it.
In the apparatus constructed according to these improvements, the drill spindle
is rotated by means of a ratchet and pawl or similar means, and is fed to its work
by an externally screwed sleeve abutting against the collar on the drill spindle and
working through a fixed nut. Motion is communicated from the spindle to the
sleeve through an adjustable clutch, the pressure between which and the sleeve
is so regulated that upon the drill encountering any unusual resistance, the
clutch or friction surface will slip, thereby stopping the feed motion, and avoiding
breakage.
We will more particularly describe our said invention with reference to the
accompanying drawings, in which
Figure 1 is a sectional plan, and Figure 2 a sectional end view.
A is the spindle collar forged upon the drill spindle B. Upon this spindle there
is arranged the externally screwed sleeve C, the end of which or a flange on the
end of which abuts upon the collar A as shewn. The other end of this sleeve is
connected with the spindle B, and is driven thereby through the means of a suitable
friction clutch. The clutch which we prefer to employ is a conical clutch, such as
is represented in Figure 1. The end of the sleeve is enlarged and conically recessed
as at E, and has fitted within it the conical block F, secured upon the spindle by a
feather R, so that the block whilst being free to slide upon the spindle, is compelled
to rotate with it. The pressure between the conical block F and the corresponding
recess in E, is regulated by means of the nut and lock nut G, on a screwed part
of the spindle. The manipulation of these nuts may be rendered more easy by the
handles H, which may be forged or cast upon them. The rotation of the spindle
may be effected through the ratchet wheels J K or either of them, these wheels
being rotated in the usual way by means of pawls and the handles J' K'.
The nut in which the screwed sleeve rotates may be carried upon any part of the
stand or fixing with which the apparatus is worked, but for general convenience,
we prefer to form it in the end piece L, of a triangular framing. This framing may
consist of the two end pieces L P connected together by the three rods O. In the
end piece L, there is a block M, dovetailed into L, and constructed in such a manner
that the inner junction between the block M and the end piece L bisects the nut.
This block may be secured in the end piece by means of the pin or cotter N,
so that on loosening the block M, after withdrawing the cotter, the apparatus may
be readily removed from the framing, or the sleeve may be moved back, after being
fed to its full length.
In order to avoid an inconvenient length in the drawing, the middle portion of
the rods O, the sleeve, and the spindle are represented as being broken away.
The apparatus may be clamped by the rods O to any suitable support or framing,
or when there is a suitable abutment, the end P may be fixed against it, when the
apparatus will be supported between the abutment and the drill.
Since the feed motion is communicated to the tool through the two frictional
driving surfaces A E, it will be evident that in the event of the tool encountering
any resistance not provided for, these surfaces or one of them, will slip, and the
feed motion will consequently cease to be transmitted to the tool. The adjustment
of the friction by means of the nuts G is readily effected to a great degree of
nicety, for the purpose of securing the transmission of the feed motion for ordinary
work, and for inducing slip for an extraordinary amount of work or for unusual
resistance.
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. Drilling and boring annaratus having a frictional feed constructed and

page_text: 2. In drilling and boring apparatus, the combination with a rotary drill spindle, of
an externally screwed sleeve working in a fixed nut, a frictional surface between
the sleeve and the spindle, a friction clutch for driving the sleeve from the spindle,
and nuts or devices for adjusting the frictional contact of the clutch and frictional
surfaces, constructed and arranged substantially as and for the purpose hereinbefore
described and as illustrated by the accompanying drawings.
Dated this 3rd day of September A.D. 1892.
WILLIAM E. HEYS,
Agent for the Applicants.