IMPROVEMENTS IN DRILLS FOR BORING HOLES IN METAL OR OTHER HARD SUBSTANCE[S]
Year: 1883

page_text: LETTERS PATENT to Augustus Arthur Patterson of Nunhead in the County of
Surrey for an Invention of "IMPROVEMENTS IN DRILLS FOR BORING HOLES
IN METAL OR OTHER HARD SUBSTANCE[S]"
PROVISIONAL SPECIFICATION left by the said Augustus Arthur Patterson
at the Office of the Commissioners of Patents on the 2nd February 1883.
AUGUSTUS ARTHUR PATTERSON of Nunhead in the County of Surrey "IMPROVE-
MENTS IN DRILLS FOR BORING HOLES IN METAL OR OTHER HARD SUBSTANCES
In constructing a drill or instrument for boring holes according to my Invention
the drill proper is provided with a screw thread working in a screw nut of a conical
or such other form as may be held by friction which screw nut has its seating in a
collar piece mounted on or between toggle arms or levers connected to tongs or
grasping devices which seize or hold firmly the pipe or article to be, bored.
A spring exerts pressure upon the upper side of this nut a friction plate and balls
or rollers intervening. A cap piece is screwed on to the said collar piece and
compresses the spring to cause it to exert the necessary pressure upon the top of
the nut. In using the Instrument the tongs are caused to clasp the articles in
which the hole is to be bored and the drill is screwed down upon the said article.
At first owing to the resistance to the entry of the drill into the material being
bored the nut is brought out of contact with its seating in the collar piece and the
said nut revolves with the drill the spring above giving the necessary pressure to
cause the penetration of the drill; when the nut comes into contact with its seating
it is held by frictional contact and the screw thread runs down in the screw thread
of the said nut and continues the boring by the screwing action until the conical
nut rises from its seat when the penetration is again continued under the force of
the spring and so on. The tongs or clasping devices may be formed with adjustable
and alterable end pieces by which the said tongs may be fitted to grasp articles of
various shapes
The mechanism described may be applied to drills whether they be operated by
hand or machine power. When applied to machine actuated drills the herein before
mentioned toggle arms or levers and clasping tongs may of course be omitted,

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Augustus Arthur Patterson in the Great Seal Patent Office on the
28th July 1883.
AUGUSTUS ARTHUR PATTERSON of Nunhead in the County of Surrey "IMPROVE-
MENTS IN DRILLS FOR BORING HOLES IN METAL OR OTHER HARD SUBSTANCES
"
In constructing a drill or instrument for boring holes according to my Invention
the drill stock or drill proper is provided with a screw thread working in a screw
nut which is of a conical or such other form on the exterior as to be held by
friction in its seating in a frame or collar piece mounted on or between toggle arms
or levers connected to tongs or grasping devices which seize and hold firmly the
pipe or article to be bored. A. spring exerts pressure upon the upper side of this
nut, a plate and anti friction balls or rollers intervening, A cap piece is screwed
on to the said collar piece and compresses the spring so as to exert the necessary
pressure upon the top of the nut to cause the drill when rotated to penetrate the
article to be bored. In using the instrument the tongs are caused to clasp the
articles in which the hole is to be bored and the drill is screwed down upon the
said article.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 of my drawings represents an elevation and Figure 2 a sectional
elevation at right angles to figure 1 of a drilling apparatus constructed according to
my Invention and Figure 3 is a detail which will be hereinafter referred to.
The cutting point A or drill proper is securely held in a drill stock or holder B
which is provided with a screw thread C working in a correspondingly screwed
nut D.
The exterior of this nut is of a conical form and is fitted in a correspondingly
shaped recess or seat in a frame or collar piece E mounted on and between the
upper ends fof two pairs of toggle arins or levers F F¹ the opposite or lower ends
of which arms or levers are jointed at g to the upper arms of two pairs of tongs or
levers G G¹ centred at g² to a transverse piece H. The piece H is bowed out or
is of a semi circular form at the centre as shewn in Figure 3 so as not to interfere
with the proper working of the drill stock B. The lower arms of the tongs or
levers G G may be hook shaped as shewn in Figure 1 or they may be provided
with removable or adjustable end pieces to enable them to securely grasp between
them any shaped article it is desired to bore.
On the top of the nut D is placed a spring I with a plate or washer K and anti
friction rollers or balls L intervening, and over this spring is screwed a cap or
cover M which may be screwed more or less into the frame or collar piece E so as to
compress more or less as required the spring I and thereby impart to the drill A
the necessary pressure to cause the said drill when rotated to penetrate the article
to be bored. The article to be bored is firmly held between the lower arms or
jaws of the tongs or levers G G₁ by opening out or extending the upper arms
thereof by means of an extending bar N which is provided with notches n at one
end thereof and at the opposite end with a screw n³. One or other of the notches n
(according to the size of the article to be grasped by the tongs) is made to engage
with a stud h on one of the upper arms of one of the pairs of tongs or levers & G¹
whilst the screwed end n2 is passed through an eye piece i fitted to the upper end
of the other lever or arm of the said pair of tongs or levers. A thumb nut O is

page_text: fitted on to the outer end of the screw n³ and bears against the eye piece i so that
by rotating the nut in one direction the upper arms of the tongs or levers G G¹
will be caused to close and consequently close the lower arms on to the article
placed between them and thus hold it securely in position. By rotating the nut
in the opposite direction the lower arms of the tongs will open out and release the
article. The article having been secured in position as described the drill is lowered
on to it by rotating the stock or holder B in the nut D by means of a handle fitted
on to the square d². When the point of the drill comes into contact with the
article to be bored the resistance presented to the entrance of the drill into the
material being bored causes the nut D to be raised or brought out of contact with
its seating in the collar piece E and the said nut then revolves with the drill the
spring I giving the necessary pressure to cause the penetration of the drill. When
the drill has penetrated the material sufficiently to cause the nut to come into
contact with its seating again it is prevented from rotating therein by frictional
contact so that the screwed drill stock B then turns in the thread of the said nut
and continues the boring by the screwing action until the conical nut rises again
from its seat when the penetration is still continued under the force of the spring
and so on until the hole is bored to the required depth.
The mechanism described may be applied to drills whether they be operated by
hand or machine power. When applied to machine actuated drills the hereinbefore
described toggle arms or levers and clasping tongs may of course be omitted; also
when the article to be bored is too large to be grasped by the tongs G the apparatus
may be secured to the article by means of chains or their equivalents passed round
the article and fastened to the hooks P P or in any other convenient manner.
Having now described and particularly ascertained the nature of my said
said Invention and the manner in which the same is or may be used or carried
into effect I would observe in conclusion that what I consider to be novel and
original and therefore claim as the Invention secured to me by the hereinbefore in
part recited Letters Patent is:―
First In apparatus for boring holes in metal and other hard substances, the
employment of a screw threaded drill or drill holder working in a correspondingly
screwed nut in combination with a spring for exerting the necessary pressure upon
the drill to cause it when rotated to penetrate the article to be bored, substantially
as hereinbefore described and illustrated by my drawings.
Second-In apparatus for boring holes in metal and other hard substances, the
combination with a screw threaded drill or drill holder and correspondingly screwed
out, of the spring I, antifriction balls or rollers L, washer or plate K, and screwed
cap or cover M, arranged and operating substantially in the manner hereinbefore
described and illustrated by my drawings.
Third: The combination of the screw threaded drill holder or drill B, screwed
nut D, spring I, antifriction balls or rollers L, plate K, screwed cap M, toggle arms
or levers F F, and gripping tongs G G', all arranged and operating substantially
in the manner and for the purpose herein before described and illustrated by my
drawings.
Fourth-The general construction, combination, and arrangement of apparatus
for drilling holes in metal and other hard substances, as herein before described and
illustrated by my Drawings.
In witness whereof I the said Augustus Arthur Patterson have to this my
Specification set my hand and seal this twenty-seventh day of July One thousand
eight hundred and eighty three.
AUGUSTUS ARTHUR PATTERSON (L.S.)