IMPROVEMENTS IN THE CONSTRUCTION OF RADIAL ARM DRILLING AND SLOT-DRILLING MACHINES
Year: 1876

page_text: LETTERS PATENT to George Lowry, of Salford, in the County of Lancaster,
Machinist, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF
RADIAL ARM DRILLING AND SLOT-DRILLING MACHINES."
PROVISIONAL SPECIFICATION left by the said George Lowry at the Office
of the Commissioners of Patents on the 5th February 1876.
" IMPROVE-
GEORGE LOWRY, of Salford, in the County of Lancaster, Machinist.
MENTS IN THE CONSTRUCTION OF RADIAL ARM-DRILLING AND SLOT-DRILLING
MACHINES."
.
This Invention relates, first, to the radial arm-drilling machine described in the
Specification of the Invention for which Letters Patent were granted to me bearing
date the Twentieth day of Junc, A.D. 1872, No. 1856, and consists in certain
improvements for resisting the excessive strain on the front of the radial arm when
large tools are drilling or boring. The pillar and back upright carry the ordinary
cone pulleys and shafts; but instead of having the bottom end of the back upright
at some distance from the platform, as at present, I extend it downwards to the
upper surface of the platform itself, and connect to it a bolt having its shank
passing through a circular groove in the platform communicating with a space, so
that the top and bottom of the head shall be in contact with the metal, and when
the bolt is properly adjusted and fixed it enables the back upright to resist the
pressure of the tools upon the front of the radial arm and keep them fairly and
efficiently at work.
The second part of this Invention has for its object the forming of the aforesaid
radial drilling machine so as to act as a slot-drilling machine, and consists in
making the cross slide on the radial arm which carries the drill spindle to traverse
to and fro while the drill revolves; this is done by an eccentric wheel on the
traversing screw connected by a train of wheels to the telescope shaft, and the feed
at each end of the stroke is obtained by an extra ratchet fixed on the ordinary
upright feed shaft.
This part of my Invention, although principally intended to be used with my
patent radial arm-drilling machines, may also be applied with advantage to the
ordinary drilling machines.

page_text: SPECIFICATION in pursuance of the conditions of the said Letters Patent filod
by the said George Lowry in the Great Seal Patent Office on the 11th August
1876.
GEORGE LOWRY, of Salford, in the County of Lancaster, Machinist. " IMPROVE-
MENTS IN THE CONSTRUCTION OF RADIAL ARM-DRILLING AND SLOT-DRILLING
MACHINES."
This Invention relates, first, to the radial arm-drilling machine described in the
Specification of the Invention for which Letters Patent were granted to me bearing
date the Twentieth day of June, A.D. 1872, No. 1856, and consists in certain
improvements for resisting the excessive strain on the front of the radial arm when
large tools are drilling or boring. The pillar and back upright carry the ordinary
cone pulleys and shafts; but instead of having the bottom end of the back upright
at some distance from the platform, as at present, I extend it downwards to the
upper surface of the platform itself, and connect to it a bolt having its shank
passing through a circular groove in the platform communicating with a space, so
that the top and bottom of the head shall be in contact with the metal, and when
the bolt is properly adjusted and fixed it enables the back upright to resist the
pressure of the tools upon the front of the radial arm and keep them fairly and
efficiently at work.
The second part of my Invention has for its object the forming of the radial arm
drilling machine so as to act as a slot-drilling machine, and consists in making the
cross slide on the radial arm which carries the drill spindle to traverse to and fro
while the drill revolves; this is done by an eccentric wheel on the traversing screw
connected by a train of wheels to the telescope shaft, and the feed at each end of
the stroke is obtained by an extra ratchet fixed on the ordinary upright feed
shaft.
On the accompanying Sheet of Drawings Fig. 1 is a side elevation; Fig. 2, an
end view of the back part of the machine; and Figs. 3 and 4 are detached views
of parts of the same.
In Figs. 1 and 2 a represents the pillar; b, the back upright carrying the ordinary
cone pulleys c and shaft d. I extend the back upright b to the surface of the
platform e, and connect to it a bolt f having its shank passing through a circular
groove g in the platform e communicating with a space h, so that when the top and
bottom of the head of the bolt f is properly adjusted and fixed it enables the
back upright b to resist the pressure of the tools upon the front of the radial
arm j.
The next part of my Invention has for its object the forming of the radial arm-
drilling machine so as to act as a slot-drilling machine, and consists in making the
cross slide on the radial arm ; which carries the drill to traverse to and fro
in a self-acting manner while the drill revolves; this is done by means of a rod m
in the radial arm j having on it adjustable blocks or snugs n, o, so that when the
slide box k comes in contact with the block o it draws the rod m and removes the
clutch P from the clutch box q and places it in the other clutch box ?, and at the
same time it pushes the small weighted lever o' to the extent of the slot p¹, which
then overbalances the large weighted lever q' and throws the clutch into the clutch
box r, which then changes the motion of the screw 8 and brings the slide box k
back, so as to come in contact with the other block n at each end of the stroke,
the feed being obtained by the extra ratchet wheel t on the ordinary upright feed
shaft u, and the ratchet is pushed forwards and backwards by the regulating rods v, w,
fixed to an adjustable bracket on the radial arm j, and at the end of each stroke
the ratchet comes in contact with one of the regulating rods v, w, by which means
the feed is obtained; but when not required for slotting the clutch p is kept out of
the clutch boxes , by the weighted levers o¹, q', by a small pin s being placed
through the brackets t¹, as shewn in Fig. 1.
Figs. 3 and 4 shew the arrangement of the toothed wheels d' on the shaft d with

page_text: the clutch boxes q, "; which toothed wheels gear into other toothed wheels e¹, f¹,
geared into other toothed wheels g', h¹, running loose on the plain part j₁ of the
traversing screw 8, on which is fixed an eccentric wheel, over which is placed a
nangle wheel actuated by means of the clutch m fast on the shaft and lever n'
for regulating the speed of the traversing screw 8.
Having now described the nature and particulars of my said Invention I desire
it to be understood that I claim,―
First. The mode or method shewn and described for strengthening and supporting
the pillar and back upright, for the purpose set forth.
Secondly. The mode or method of causing the drilling machine to act as a slot-
drilling machine, as shewn and described.
In witness whereof, I, the said George Lowry, have hereunto set my hand
and seal, this Ninth day of August, in the year of our Lord One thousand
eight hundred and seventy-six.
GEORGE LOWRY. (L.S.)