Year: 1891

page_text: Fig. 1. is a front elevation of machine for drilling the flanges of tubes for boiler
flues, with tubes and both drills in position.
Fig. 2. is a side elevation of Fig. 1.
Fig. 3. is a detail of pulley for chain and balance weight.
The flues A whilst being drilled are fixed on a circular table A. which is fitted
with a series of ordinary chuck jaws, which are moved simultaneously.
The circular table A is rotated by a hand wheel B. which is (when required)
connected with the ordinary dividing motion, for pitching the holes to be drilled,
the said table resting upon a suitable bed C.
At each end of this bed C is a vertical standard D. D', upon these standards is
fixed an adjustable vertical slide or saddle E. E¹, which carries an adjustable
horizontal slide F. F', for adjusting the drills in position for drilling the said tubes
or flues A; an adjustable stop nut G. is placed upon a screwed rod G₁ attach. d
to the slide E, in order (after adjusting the drills) to be set in any required position
for drilling.
The adjustable slide E is adjustable by means of a hand wheel or cross handle H
operating a pinion wheel H³, gearing with a spur wheel H, which in turn operates
a bevel wheel H³, such bevel wheel operating a bevel wheel H*, with a key sliding
upon the grooved vertical screw H' and at the same time adjusting or feeding the
lower countersinking drills L'. When such drills are required to be withdrawn the
motion is reversed, the slide E being adjusted simultaneously by means of mitre
wheels J. J', shaft J, and vertical screw Js on standard D¹, receiving their motion
from the vertical screw H, and cross handle H.
Upon the horizontal slides F and F¹ are fixed steel headstocks K. K¹ for drill
spindles K', upon the drill spindle nose is fitted or attached a rosebit k⚫ for
countersinking the holes when drilled.
Also upon the lower part of the slides F. F¹ is fixed an adjustable steel head-
stock L. L, similar to the above, which also carries a rosebit L³, on the point of
the spindle L, for countersinking the hole on the underneath flange.

page_text: The headstocks L. L³, being adjustable vertically (to suit various lengths of drills
used by the upper headstocks K, K',) by means of hand wheels L, and screws L',
upon the horizontal slides F and F.
For withdrawing the drills clear of the flues when drilled or finished, we employ
cross handles or hand wheels M, M', which by means of pinions M² gearing with a
rack M³, fixed to the slide E, withdraws the slides F F, carrying the headstocks
and drill spindles clear of the flues while being changed.
The drills K receive their motion from a steel pinion N, keyed on the drill
spindle, such pinion gears with a spur wheel N', upon a vertical shaft N2; this
shaft is driven by mitre wheels N³, and short horizontal shaft N.
This horizontal shaft N, is driven by a mitre wheel P, gearing with a mitre
wheel P, upon a stud P2; upon this stud is also a spur wheel or pinion P³, gearing
with a pinion P4, on a vertical shaft R; this shaft R is driven (by means of bevel
gear wheels) by the main or other driving shaft R¹, preferably by cone pulleys R²,
fixed in any suitable position.
A self acting feed motion is applied to both saddles E E¹ from the vertical
shaft R, by means of worm S, upon the shaft R, gearing with a worm wheel S¹ on
a short shaft S2; this worm wheel S₁ driving a worm S3 on the same shaft, gearing
into a worm wheel S upon another short shaft S, thereby operating bevel gearing
on the screwed shaft H, thus giving a suitable self acting traverse to both drills.
Upon the upper portion of the saddle or slide E, is placed a short shaft T with
square T for handle, on the inner end of which is keyed a small mitre wheel T²,
gearing with a similar wheel T3 on a revolving or adjustable nut T, on the screwed
shaft H, by this arrangement the lengths of the various drills may be adjusted.
Each saddle is provided with a balance weight U and chain V for compensating
the weight of the saddles upon the standards.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A drilling machine for drilling the flanges and washers of tubes of boiler flues
in position and countersinking the said flanges at one operation for the purposes
described.
2. Constructing the drill holders, slides, and bearings (for drilling the flanges of
tubes in position) preferably of steel, phosphor bronze, or gun metal in the manner
and for the purpose such as shown and described.
3. Operating and adjusting the drills, slides, and headstocks, upon the opposite
sides of the flanges of tubes of boiler flues simultaneously or independently as and
for the purposes substantially as shown and described.
4. The general arrangement and construction of apparatus in the manner and for
the purposes substantially such as shown and described.
Dated this Fifth day of March 1901
JOHN E. WALSH,
Crossley Street, Halifax, Agent for the Applicants.