IMPROVEMENTS IN RADIAL DRILLING MACHINES FOR DRILLING THE HOLES IN SHELL PLATES OF BOILERS AND OTHER WORK.
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Charles Scriven at the Office of the
Commissioners of Patents on the 4th March 1878.
CHARLES SCRIVEN, of Leeds Old, Foundry, Leeds, in the County of York,
Engineer IMPROVEMENTS IN RADIAL DRILLING MACHINES FOR DRILLING THE
HOLES IN SHELL PLATES OF BOILERS AND OTHER WORK.".
This Invention has mainly for its object to construct a drilling machine in such
a manner that any number of drills can be brought into operation on the shell of
a boiler or other work, whilst at the same time each drill when at work is always
drilling in a line to the centre of the boiler, and each drilling spindle has its own
feed motion and driving motion, and each can be stopped or started independently
of the other, so enabling a broken or blunt drill to be replaced without stopping
the remainder, and enabling each drilling spindle to be separately adjusted to the
hole to be drilled.
For these purposes I form a machine of a round or other convenient form of
standard, upon which is a circular slide with the usual V shaped edges or otherwise,
and which has a vertical motion so that it can be raised or lowered to bring it into
position for enabling any part of the work to be drilled; this slide carries and has
revolving upon it concentrically with the standard an internal spur wheel and
bevil wheel which are cast together. This internal spur wheel receives motion
from a pinion working upon a sliding feather on a vertical shaft, which shaft
receives its motion from gearing and pulleys through a horizontal shaft from any
prime mover.
The circular slide has moving round upon it and capable of adjustment one or
more carriages, each carrying a drilling spindle, and each carriage has a bevel
pinion working into the bevel wheel before-mentioned to give the rotary motion.to
the drilling spindle which can be stopped or started at pleasure. To the circular
slide before-mentioned is fitted or cast upon it a circular rack or worm wheel, and
each carriage is provided with suitable gearing and hand wheel working into the
rack before named; this adjusts each carriage with its drilling spindle to its work,
and also by turning of the hand wheel it will accurately pitch the rivet holes
without any other setting out of rivet holes on the shell of boiler to be drilled.
The circular slide can be raised or lowered by a screw working into a nut fixed

page_text: ་་
to the circular slide before-mentioned, which screw is caused to revolve by gearing
wheels and friction clutches from the first motion shaft of machine and so can be
raised or lowered by steam power, the screw can also be revolved by a hand wheel
on que end of a shaft carried by the circular slido; on the other end of said shaft is
a bevel wheel working into a bevel wheel attached to the circular slide and working
on a sliding feather on the aforesaid screw, by which means the circular slide can
be raised or lowered by hand.
The circular slide can also be fixed upon the top of a round or other convenient
form of pillar, the carriage carrying the drilling spindle, the internal spur, and the
bevel wheel, and other gear remaining the same as before-mentioned, and the pillar
carrying the circular slide, and be made to slide up and down through a suitable
bracket fixed to the ground, the pillar sliding through this bracket into a pit made
to receive it; the drilling spindles can thus be lowered below the shell of boiler or
other work.
"
The vertical shaft for giving-motion to the drills may work through a bevel
wheel in which is a sliding feather, this bevel wheel being carried by the bracket
through which the pillar slides, and receiving motion from another bevel wheel on
the end of a shaft, at the other end of which shaft are the driving pulleys at the
. outside of boiler shell or in any other convenient position.
The boiler shell is carried on a fixed table, and the advantages of this
arrangement are that the machine can be lowered out of the way after the boiler
shell has been operated upon by the drill...
The machine can be arranged so that the circular slide can be turned round upon
the pillar, and raised and lowered without employing any outer socket pillar by
having a worm. wheel on the circular slide and in connection with this wheel (by
suitable attachments to slido up and down with it, but independent of it) a split
hoop carrying a worm and suitable handle.
When the slide has been placed the required height the hoop is clasped tight
round the pillar by bolt or other convenient means, so that the slide can rest upon
the hoop, and slide can then be turned round by turning the worm to suit the work
required to be operated upon.
Other drilling machines having a drill or drills carried by a radial arm or arms
which can be raised or lowered and also swung round a pillar may similarly be
formed with a worm, worm wheel, and clip, to enable the arm or arms to be swung
round into any desired position without it being necessary to employ any outer
socket pillar.