Improvements in Universal Machinery for Drilling, Screw-tapping, and the like.
Year: 1892

page_text: Date of Application, 31st May, 1892
Complete Specification Left, 21st Feb., 1893-Accepted, 25th Mar., 1893.
TRUVIDIONAL DECIFICATION,
Improvements in Universal Machinery for Drilling, Screw-tapping,
and the like.
I, CHARLES MERSON DAVIES, M.I.M.E., Chief Engineer to Messieurs Dubs
and Company, Glasgow Locomotive Works, Aitkenhead Road, Glasgow, in the
County of Lanark, North Britain, do hereby declare the nature of this invention
to be as follows, that is to say:-
My said invention has for its object to facilitate operations and to reduce the
expenditure of time and labor in effecting the drilling, screw-tapping and like work
required in constructing locomotive and other steam boilers and other structures of
steel, iron, or other materials. The invention comprises drilling and like mechanism
which is universally adjustable as regards position and direction, together with
arrangements for transmitting driving power to the mechanism, and with parts for
carrying the whole.
In carrying out the invention in the case, for example, in which holes have to be
drilled in the firebox end of a locomotive boiler, there is fixed at the firedoor
opening a trunnion or massive stud formed with a flange or disk by means of which
it is attached. On the trunnion there is mounted, by means of a short sleeve
formed on it, an arm or beam which is by preference made of steel and hollow whilst
it is cylindrical externally. The beam extends in one direction from its centre
sleeve and is more or less counterbalanced by a weighted arm extending in the
opposite direction. The beam has upon it a saddle or carrier which can be moved
along and turned upon it into any required position; and the carrier has fitted to
it a drill head which can be turned round in the part of the carrier holding it, this
turning movement being about an axis to which the drill spindle is at right angles.
The drill spindle is driven by means of bevil wheels from a spindle passing
through the part of the drill head held by the carrier, such spindle having on its
outer end a pulley for the driving rope which is employed in the example now
being described. The feed of the drill spindle is effected by a wormwheel and
worm driven through small spur wheels from the pulley spindle; and provision is
made for disengaging this feed motion and for moving the drill spindle quickly in
either direction by means of a handle.
The drill head is clamped in any required position in the carrier by screwing
together a divided and flanged part in which the head is held; and the carrier can
be clamped in a similar way on the main arm or beam. The main arm or beam has
a similar arrangement for clamping it on the trunnion, and it has also fixed on its
centre a wormwheel or spurwheel with which a worm or pinion gears for turning it
into any desired position. To facilitate the adjusting of the carrier along the beam,
a pinion on the carrier and movable by a worm gears with a toothed rack held by
clamping rings at its ends on the beam and capable of being clamped in any position
along or around the beam. Provision is made for imparting additional rigidity to
the beam, especially when the drill head is at or near the outer end of it, such
provision consisting of a stay link in two parts connected by a right-and-left screw
coupling and having its outer end jointed to a ring which can be clamped on the
beam, whilst its inner end has jointed to it a claw which engages in a groove made
for it in the flange or disk of the trunnion.
When driving by means of a rope, the rope receives its motion from a pulley on
an overhead shaft in the workshop whence it descends to guiding and tension-giving
apparatus which may be arranged in connection with a pillar or wall of the work-
shop. A block to which the tension weight is hung and which can move in vertical

page_text: guides, is fitted with guide pulleys under which the two parts of the rope loop
pass. The parts of the rope next pass over guide pulleys carried by a stationary
support, and thence proceed to guide pulleys on the counterbalancing arm of the
main beam whence they extend to the pulley of the drill head. There may be
guide pulleys on stationary or adjustable supports in various positions, to allow of
the driving rope being led to the main beam in whatever way may be found suitable
for the position it may be in.
For some purposes, as for example when drilling holes in the sides of a locomotive
boiler, I provide an intermediate arm or beam to carry guide pulleys for leading
the driving rope in a convenient way to the main arm or beam.
This intermediate
arm or beam may be set on a trunnion fixed to the end of the boiler or to any
convenient support, the main arm or beam being fixed to the side of the boiler or
otherwise.
Instead of rope driving being employed, the power may be transmitted by flexible
shafting, or it may be directly communicated by an electric motor.
Dated this Thirtieth day of May 180
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Universal Machinery for Drilling, Screw-tapping,
and the like.
I, CHARLES MERSON DAVIES, M.I.M.E., Chief Engineer to Messieurs Dubs
and Company, Glasgow Locomotive Works, Aitkenhead Road, Glasgow, in the
County of Lanark, North Britain, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement, that is to say:-
My said invention has for its object to facilitate operations and to reduce the
expenditure of time and labor in effecting the drilling, screw-tapping and like work
required in constructing locomotive and other structures of steel, iron, or other
materials. My invention comprises drilling and like mechanism which is universally
adjustable as regards position and direction, together with arrangements for trans-
mitting driving power to the mechanism and with parts for carrying the whole.
In carrying out my invention in the case, for example, in which holes have to be
drilled in the fire-box end of a locomotive boiler, there is fixed at the firedoor
opening a trunnion or stud, on which is mounted an arm or beam having on it an
adjustable saddle or carrier supporting an adjustable drill head. The drill head
can be adjusted to drill holes in various directions and in various positions round
about the trunnion; and it may be driven by suitably guided ropes, or by flexible
shafting, or by a directly acting electric motor.
And in order that my said invention and the manner of performing the same may
be properly understood I hereunto append six sheets of explanatory drawings to be
hereinafter referred to and representing my improved machinery as arranged for
being rope driven.
Figure, 1, on Sheet, 1, of the drawings is a sectional elevation showing the
application of my universal drill to the firebox end of a locomotive boiler; and
Figure, 2, Sheet, 2, is an elevation showing the application of the drill to the inside
of a similar boiler.
Figures, 3, and, 4, show arrangements of the apparatus for guiding the driving
rope.
Figures, 5, 6, and, 7, Sheet, 3, are enlarged detail views of parts of the trunnion
and of the arm or beam carried by it.
Figures, 8, 9, and, 10, Sheet, 4, are enlarged detail views of parts for carrying
the trunnion on the barrel of a boiler or other curved surface.
Figures, 11, 12, and, 13, Sheets, 5, and 6, are enlarged detail views of the drilling

page_text: mechanism. In these drawings the same reference letters and numerals are used to,
mark the same or like parts wherever they are repeated.
The trunnion, A, for carrying the drilling mechanism and which is seen in
Figures, 1, and 2, and enlarged in Figures, 5, 6, and 7, is formed with a flange or
disk, A. 1, secured by bolts to the firebox end of the locomotive boiler, or to any
convenient part of the structure to be operated on. On the trunnion, A, there is
mounted, by means of a short sleeve, B 1, formed on it, an arm or beam, B, which
is by preference made of steel and hollow, whilst it is cylindrical externally. The
arm, B, is held by its sleeve, B 1, between collars, A 2, A 3, adjustable outwards
and inwards on the trunnion, A, and secured thereon by screws. The beam, B,
can be turned round upon the trunnion, A, into any position by means of a worm-
wheel, B 2, formed or fixed on its sleeve, B 1, and acted on by a worm, A 4, held
by lugs formed on the outer collar, A 3, which is firmly held on the trunnion by a
screw pin, A 5, passing through holes completely across the trunnion. The end
journals of the worm, A 4, are squared to receive a crank handle. When adjusted
by means of the worm and worm wheel, the beam, B, is steadied by means of a
pinching screw, B 3, screwed through its sleeve, B 1. The beam, B, extends in
one direction from its centre sleeve, B 1, and is more or less counterbalanced by an
arm, B4, extending in the opposite direction and having on it an adjustable
weight, B 5.
The beam, B, has upon it a saddle or carrier, C, which can be moved along and
turned upon it into any required position; and the carrier, C, has fitted to it a drill
head, D, which can be turned round in the part, C 1, of the carrier holding it, this
turning movement being about an axis to which the drill spindle, D 1, is at right
angles. The drill spindle, D 1, is driven by means of bevil wheels, D2, from a
spindle, D 3, passing through the part of the drill head, D, held by the part, C 1,
of the carrier, the spindle, D 3, having on its outer end a pulley, D4, for the
driving rope, R, which is employed in the example now being described. The feed
of the drill spindle, D 1, is effected by a wormwheel, D 5, and worm, D 6, driven
through small spurwheels, D7, from the pulley spindle, D 3; and provision is made
for disengaging this feed motion, and for moving the drill spindle, D 1, quickly in
either direction, by means of a handle, D 8. The worm, D 6, is on a tube on the
spindle driven by the spur wheels, D 7, and is driven by a conical clutch, D 9,
which is tightened up or relieved by means of a screw cap at the other end of the
spindle which can be turned by means of a milled finger wheel, 1 D. On the drill
spindle, D 1, there is fitted between collars and so that the spindle can turn freely
in it, a tube or sleeve, 2 D, which has formed on it externally a screw thread to
work in an internal screw thread in the eye of the wormwheel, D 5. A longitudinal
groove is cut across the screw threads of the sleeve, 2 D, and in this groove engages
a key in the eye of the centre, 3 D, to which the handle, D8, is fixed. The said
centre, 3 D, has on its inner end a projection, 4 D, which engages with a notch in
the outer end of the bearing, 5 D, of the drill head, when the handle, D8, with its
centre, 3 D, is moved close to the bearing. In this position the sleeve, 2 D, is pre-
vented from turning, and the action on it of the wormwheel, D 5, makes it feed
forward the drill spindle, D 1. When the handle, D8, with its centre, 3D, is
moved away from the bearing, 5 D, it can be turned by hand and will turn the
sleeve, 2 D, so that the latter will screw through the wormwheel, D 5, whereby
the drill spindle, D1, can when desired be moved more quickly in either direc-
tion by hand than by means of the automatic feed gear. A spring, 6 D, fixed
to the bearing, 5 D, is applied so as by bearing on one side or other of a bead.
on the handled centre, 3 D, to hold that centre either engaged with or free from
the bearing.
The drill head, D, is clamped in any required position in the carrier, C, by
screwing together the divided and flanged part, C 1, in which the head is held ;
and the carrier, C, is made with a similar divided and flanged part, C 2, which can
be tightened by a screw, C 3, so as to clamp the carrier on the main arm or beam, B.
To facilitate the adjusting of the carrier, C, along the beam, B, a pinion, C 4, on

page_text: the carrier and movable by a worm, C 5, gears with a toothed rack, E, held by
clamping rings, E 1, at its ends on the beam, and capable of being clamped in any
position along or around the beam. Provision is made for imparting additional
rigidity to the beam, B, especially when the drill head, D, is at or near the outer
end of it, such provision consisting of a stay link (not shown) in two parts connected
by a right-and-left screw coupling, and having its outer end jointed to a ring which
can be clamped on the beam, B, whilst its inner end has jointed to it a claw, A6
(shown in Figures, 5, and 6,) which engages in a dovetail groove, A7, made for it
in the flange or disk, A 1, of the trunnion.
.
When driving by means of a rope, the rope, R, from a pulley, P, (Figure 1) on
an overhead shaft in the workshop, descends to guiding and tension-giving apparatus
which may be arranged in connection with a pillar or wall of the workshop.
A block, P1, to which the tension weight, P 2, is hung is fitted with guide pulleys
round under which the two parts of the rope loop, R, pass. The parts of the rope
next pass over guide pulleys, P 3, carried by a stationary support, and thence
proceed to guide pulleys, P4, P 5, on the counterbalancing arm, B4, of the main
beam, B, whence they extend to the pulley, D4, of the drill head, D.
There may be guide pulleys on stationary or adjustable supports in various
positions, to allow of the driving rope being led to the main beam in whatever way
may be suitable for the position it may be in.
For some purposes, as for example, when drilling holes in the sides of a loco-
motive boiler, I provide an intermediate arm or beam G, (Figures 2, 3, and 4,) to
carry guide pulleys, G1, G2, G3, for leading the driving rope, R, in a convenient
way to the main arm or beam, B. This intermediate arm or beam, G, may be set
on a trunnion, A 8, fixed to the end of the boiler, or to any convenient support,
the trunnion, A, carrying the main arm or beam, B, being fixed to the side of the
boiler or otherwise. For convenience in moving the drilling mechanism along a
structure like the barrel of a locomotive boiler, I employ a plate, H, such as is
shown in Figures, 2, and, 3, and, enlarged, in Figures, 8, 9, and 10, the last figure
being sectional. The plate, H, has formed on its outer side longitudinal guide
flanges, H 1, on which can slide a smaller plate, H 2, held against the flanges, H 1,
by bars, H 3, engaging upon the inner sides of the flanges, H 1, and secured to the
plate, H2, and along with that plate to the disk or flange, A 1, of the trunnion, A,
by screw stud bolts, A 9. The plate, H 2, along with the trunnion, A, is adjustable
along the larger plate, H, by means of a screw spindle, H 4, held in bearings at
the ends of the larger plate, and working in a screw nut, H 5, fixed to the smaller
plate, H 2. The larger plate, H, is secured to the boiler barrel by chains, H 6,
(Figure, 2) and is steadied in position by pins, H 7, screwed through swivelling
nuts, H 8, held between Ings at the corners and other parts of the plate, H.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :
1. The improved combination of machinery for drilling, screw-tapping, and the
like operations, substantially as hereinbefore described and shown in the accom-
panying drawings.
2. The mounting of drilling and like mechanism upon a carrier in which it is
adjustable angularly the said carrier being itself adjustable along and around a
beam which is adjustable upon a trunnion fixed to the structure to be operated on
or to some other suitable support, substantially as herein before described.
3. The supplementary beam (G) mounted on a trunnion and carrying guide
pulleys for leading a driving rope to drilling and like mechanism substantially as
hereinbefore described.
Dated this Twentieth day of February 1893.