IMPROVEMENTS IN DRILLING MACHINES
Year: 1876

page_text: LETTERS PATENT to Thomas Stuart Kennedy, of Leeds, in the County of
York, Machine Maker, for the Invention of "IMPROVEMENTS IN DRILLING
MACHINES."
Sealed the 27th June 1870, and dated the 31st January 1876.
PROVISIONAL SPECIFICATION left by the said Thomas Stuart Kennedy at
the Office of the Commissioners of Patents on the 31st January 1870.
15
THOMAS STUART KENNEDY, of Leeds, in the County of York, Machine Maker.
IMPROVEMENTS IN DRILLING MACHINES."
This Invention relates chiefly to the drilling in situ of the plates composing the
circular shells of boilers, the object being to drill vertical and horizontal lines of
holes to receive the rivets by which the plates are to be connected together.
Fitted to the opposite sides of a vertical standard which has a turntable as its
base are bracket slides which severally carry one or more radial drills. These
bracket slides are adjustable vertically by means of screw shafts extending from the
bottom to the top of the standard. The screw shafts are embraced by nuts carried
by the bracket slides, and by turning the nuts therein the slides are raised or
lowered as desired. The drills are mounted in carriers which are capable of
receiving a backward and forward motion on the bracket slides to adjust the drills
to their work, and the feed forward is obtained in the usual or in any convenient
manner. The drills are driven through gearing that receives motion from a vertical
driving shaft having its bearings in the standard.
The object of mounting the drills on bracket slides is to allow of their being
raised or lowered to any desired level to suit the work in hand.
Each vertical driving shaft is provided with a feather over which slides a mitre
wheel that is carried by a bearing on the back of the drill slide. This mitre wheel
gears into a second mitre wheel keyed fast on the end of a feather shaft which has
its bearings in the drill carrier. A pinion capable of sliding on the feather shaft
but turning with it gears into a spur wheel carried by the drill mandril, and thus
imparts rotary motion thereto. The vertical driving shafts receive their motion.
from any prime mover through a horizontal shaft, one end of which is carried by
bearings underneath the vertical standard. Fitted to this shaft is a bevil wheel
which gears into another bevil wheel carried by a stud axle fixed to the under side
of the base of the vertical standard. This second bevil wheel is cast with a pinion

page_text: upon it, which pinion gears into and drives wheels on the lower ends of the two
vertical driving shafts. The turntable which carries the upright standard is fitted
with a worm wheel and receives an axial motion from a worm carried by brackets
on the base block of the machine.
As a modification of this arrangement I propose to use an annular turntable as a
support for the work which is to be moved round to the drills), and to mount the
drills as above described on a central standard or standards, and supported on the
base of the machine,
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Stuart Kennedy in the Great Seal Patent Office on the 31st
July 1876.
THOMAS STUART KENNEDY, of Leeds, in the County of York, Machine Ruler.
"IMPROVEMENTS IN DRILLING MACHINES."
This Invention relates chiefly to the drilling in situ of the plates composing the
circular shells of boilers, the object being to drill vertical and horizontal lines of
holes to receive the rivets by which the plates are to be connected together.
In Sheet I. of the accompanying Drawings Fig. 1 shows in side elevation, Fig. 2
in end elevation, and Fig. 3 in plan. view an arrangement of drilling machinery
for effecting this object.
In these Figures A, A, is a vertical standard which has as its base a turn-
table B, B; fitted to the opposite sides-of-this standard are bracket slides C, C,
which severally carry a radial drill D, or it may be more than one radial drill; these
bracket slides are adjustable vertically by means of screw shafts E, E, extending
from the bottom to the top of the standard; these screw shafts are embraced by
nuts carried by sockets at the back of the bracket slides C, and by turning the nuts
therein the slides are raised or lowered as desired. The drills are mounted in
carriers D¹ which are capable of receiving a backward and forward motion on the
bracket slides C to adjust the drills to their work, which is intended to be built up
around the machine as indicated by the dotted lines in Figures 1 and 2, and the feed
forward of the drills is obtained in the usual or it may be in any convenient
manner. The drills are driven through gearing that receives motion from vertical
driving shafts F, F, having their bearings in the hollow standard A.
Each vertical driving shaft F is provided with a feather, over which slides a mitre
wheelf that is carried by a bearing c on the back of the drill slide; this mitre
wheel gears into a second mitre wheel keyed fast on the end of a feather shaft f
which has its bearings in the drill carrier; a pinion ƒ capable of sliding on the
feather shaft but turning with it gears into a spur wheel b carried by the mandril
of the drill D and thus imparts rotary motion thereto. The vertical driving shafts
F, F, receive their motion from any prime mover through a horizontal shaft G, one
end of which is carried by bearings in the fixed base H of the vertical standard.
Fitted to the inner end of this shaft is a bevil wheel which gears into another
bevil wheel g carried by a stud axle fixed to the under side of the base H of the
vertical standard; this second bevil wheel is cast with a spur pinion gupon it,
which pinion gears into and drives spur wheels keyed on the lower ends of the
two vertical driving shafts F. The turntable B which carries the standard A is
fitted with a worm wheel b, and receives an axial motion from a worm b¹; keyed
to a horizontal shaft b2 which is carried by brackets on the base block of the
machine.
I, I, are hand wheels for moving the drills up to and running them back from
their work. These wheels are mounted on axles c¹ having their bearings in their
respective carriers D', and they are fitted at their inner ends with worms which
take severally into worm wheels 22, the bosses of which fit into recesses on the

page_text: under side of the carriers D¹, and are tapped to receive the threads of the fixed
carrier. By turning therefore these hand wheels the drills may be advanced or
drawn back rapidly. To provide for the automatic advance of the drills the axles i¹
carry loose spur wheels which are made fast to the respective shafts by any con-
venient arrangement of bolt or catch attached to the hand wheels I; into these wheels 2*
gear respectively the spur wheels 25 carried by an axle which has its bearing in a
bracket arm of the carrier D'; on the inner ends of these axles are bevilled pinions i
which take respectively into bevil pinions d' carried by the mandrils. By this train of
gearing as the drills are rotated the carriers D' will be caused to advance auto-
matically and give the requisite feed to the drills D. K, K, are hand wheels for
giving the vertical adjustment of the bracket slides C. These wheels are keyed to
axles which have their bearings in the bracket slides and carry bevil pinions k¹
on their inner ends; in gear with these pinions are pinions keyed to short axles
that have their bearings in the bracket slides and are fitted at their inner ends
with bevil pinions which gear respectively into a ring of bevil teeth carried by the
nuts before mentioned which work on the vertical screw shafts E, E.
It will now
be understood that by turning the hand wheels K the bracket slides C may be
raised or lowered to any desired level on the standard to suit the work in hand.
As a modification of the above described arrangement of drilling machinery I
propose to use an annular turntable as a support for the work (which is to be
inoved round to the drills), and to mount the drills as above described on a central
standard or standards supported on the base of the machine.
This modification is shewn in partial sectional elevation in Sheet II. of the
Drawings, wherein the same letters of reference are used to denote the like parts.
In this arrangement the hollow standard A is cast with or affixed to the base H,
and surrounding this structure is a circular railway L supported on a circular wall
of brick work, timbers being interposed for securing the rail thereto. Upon this rail
is mounted an annular turntable M for supporting the work that is intended to be
drilled. The turntable runs upon flanged rollers m, and it is fitted on its under
side with an annular rack m¹; into this rack gears a pinion n keyed to a short
axle supported in a bracket bearing N; the outer end of this axle carries a toothed
wheel which gears into a pinion keyed to the axle of a hand wheel n³, which
axle is carried by a bracket bearing 0. By turning this hand wheel n³ the turn-
table M will be caused to move on its axis and present the work to the action of
the drills D, D.
Having now set forth the nature of my Invention of "Improvements in Drilling
Machines," and explained the manner of carrying the same into effect, I wish it to
be understood that under the above in part recited Letters Patent I claim,-
Firstly. The arrangement of drilling machinery above described with reference to
Sheet I. of the Drawings, whereby the drills may be presented to the work and
approach it to the interior thereof, as explained.
Secondly. The modification of drilling machinery described with reference to
Sheet II. of the Drawings, whereby the work instead of being stationary is adjusted
axially to the drills.
In witness whereof, I, the said Thomas Stuart Kennedy, have hereunto set
my hand and seal, the 29th day of July, in the year of our Lord One
thousand eight hundred and seventy-six.
THOMAS STUART KENNEDY. (L.S.)