APPARATUS FOR DRILLING HOLES IN SIDES AND FLANGES OF CYLINDERS
Year: 1885

page_text: We, CHARLES JOHN GALLOWAY and JOHN HENRY BECKWITH both of Knott Mill
Manchester in the County of Lancaster Engineers, do hereby declare the nature
of our invention for "APPARATUS FOR DRILLING HOLES IN SIDES AND FLANGES
OF CYLINDERS" and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
Our invention relates to apparatus so arranged that a set of drills operate
together to drill simultaneously holes in pairs diametrically opposite to each other
in the end flange or through the side of a cylinder or cylindrical boiler or other
tube or ring, which, after the drills are retracted, can be turned partly round
to have another set of holes drilled, and so on successively around its whole
circumference.
Fig. 1 of the accompanying drawings is a side view partly in section, and Fig. 2
is a plan of a machine according to our invention, with a pair of drills arranged to
operate on the flange and a pair to operate on the side of a cylindrical tube. Fig. 3
is an end view partly in section shewing the drills arranged to operate on the side
of the tube. Fig. 4 is a part side view and Fig. 5 a part transverse section of the
gearing which works the feed of the drills.
The tube or cylinder T to be drilled, is fixed in the usual
way between
headstocks H H and can be turned round step by step by dividing gear G provided
with change wheels to suit various divisions of the circumference. The drill
spindles D D are mounted in pairs on columns which can be turned round on their
vertical axes so as to present the drills either towards the flange or the side of T,
or they might be set in intermediate attitudes to drill obliquely if required.
These spindles are driven by vertical spindles and bevil gear d from cross shafts A
which pass through the lowest bevil wheels d with key ways so that they drive
the wheels whilst, the wheels can be made to slide along them by screws B which
can be turned by hand to adjust the drills to position in the first instance, and
which afterwards are made to operate as feeding screws when the drills are acting
at right angles to the axis of T. The cross shafts A are worked by gear C and
bevil gear c from the prime moving shaft P as is best seen in Fig. 3 this shaft
being made with a key way allowing the bevil wheel c through which it passes to
slide along it while they are driven by it. On the shaft P there is a worm which
drives a worm wheel p, and this by gearing drives a wheel which is free to

page_text: revolve on a tubular spindle E. Through this spindle passes a rod k which by
means of a hand lever K can be moved to or fro. By the one movement it
clutches the wheel Q to the tubular spindle E, by the other movement it
unclutches it. The spindle E, when Qis clutched with it, drives through bevil
gear e feed screws F, either of which can be unclutched, these giving the drills
longitudinal feed. By a clutch and bevil gear at L the spindle E can drive
longitudinal spindles M which by bevil gear M and spur gear 6 drive the screws B
that give the drills transverse feed.
While the feed spindle E is caused to revolve by its engagement with the wheel Q
a barrel R driven by it winds up a cord which is, led over guide pulleys to any
convenient position where it is loaded with a weight W. When the drills have
completed their holes, the attendant by moving the lever K unclutches the wheel Q
from E, and then the weight W descends causing the barrel R and spindle E to
revolve rapidly backwards and so to withdraw the drills. The cylinder T being
then turned a division, as determined by the dividing gear G, the wheel Q is again
clutched to E and another set of holes is drilled.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what.
we claim is
The construction of apparatus for drilling holes in sides and flanges of cylinders,
the drills for this purpose being mounted and driven so that they can be turned
round in a horizontal plane, and being advanced by feed gear winding up a weight
which, on unclutching the feed from the prime moving shaft, descends, rapidly
withdrawing the drills, substantially as herein described.
· ABEL & IMRAY,
Agents for the Applicants,
28, Southampton Buildings,
London, W.C.