Improvements in Machinery for Carrying, Driving, and Applying Screw-tapping or other Rotating Tools.
Year: 1893

page_text: Date of Application, 1st Apr., 1893-Accepted, 6th May, 1893
COMPLETE SPECIFICATION.
Improvements in Machinery for Carrying, Driving, and Applying
Screw-tapping or other Rotating Tools.
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 screw-tapping and analogous operations
with rotating tools when constructing locomotive and other steam boilers, and
My invention comprises
other structures of steel, iron, or other materials.
mechanism which is speedily adjustable from some to others of a great variety of
positions, and which without requiring fixing or refixing to any part of the boiler
or other structure, can be used to complete the work for which it is adapted
without shifting the boiler or other structure from the position in which it is first
set for being operated on.
An example of my improved machinery is delineated upon three accompanying
sheets of explanatory drawings which are hereinafter referred to in describing the
machinery.
Figure, 1, on Sheet, 1, of the drawings is a horizontal section. Figure, 2,
Sheet, 2, and Figure, 3, Sheet, 3, are sectional elevations as at right angles to each
In
other; and Figure, 4, Sheet, 3, is a diagrammic plan drawn to a reduced scale.
these drawings the same reference letters and numerals are used to mark the same or
like parts wherever they are repeated.
The mechanism is carried by two horizontal carrier beams, A, each fixed and
connected by stays, A 1, A 2, to a vertical post, A 3, which is held and can turn in
footstep and upper bearings, A 4, A5, fixed to a column, A 6, or it might be any
fitted up. Each
other suitable part of the workshop in which the machinery
carrier beam, A, consists of two girders between which there is fitted to slide a
block, B, made with a circular bevil-edged disk at its lower part, the block being
entered up from below between the beam girders and then supported by a top
plate, B1, bolted to it and resting by its projecting edges on the girders.
The two blocks, B, carry a framing consisting of upper and lower horizontal
plates, B 2, B 3, connected by stanchions or posts, B4, the top-frame-plate, B2,
being supported on the disks.of-the-blocks, B, by bevilled rings, B 5, formed on or
fixed-to-the-plate, B2. The centres of the rings, B 5, are at the same distance
apart as the posts, A 3, of the carrier beams, A, so that the frame, B2, B3, and
beams, A, constitute a parallel motion, which can assume various positions, as, to
some extent indicated in Figure, 4. The blocks, B, carrying the frame, B2, B3,
are adjustable along the carrier beams, A, towards or from the posts, A 3, by
means of screw spindles, A 7, (indicated by dotted lines in Figures, 1, and 2,)
which can be turned by bevil gearing, A 8, at the ends of the beams, A, this
gearing being acted on by means of a handing rope or chain, A 9, depending from
a pulley on a shaft, 10, connecting and acting or gearing at the ends of both carrier
beams, A.
The driving power is transmitted from a pulley on an overhead power shaft (not
shown) by a rope, C, the two sides of the loop of which are guided by pulleys, C 1,
at the head of the column, A 6, down to swivel-mounted pulleys, C2, situated
midway between the posts, A 3, of the carrier beams, A, in a manner to guide the
rope horizontally to and from a pulley, C3, on a short vertical shaft, C 41

page_text: carried in bearings in the frame plates, B2, B3. The vertical shaft, C4, is placed
centrally in the frame and has fast on it a spurwheel, C 5, which gears with
pinions, D 1, on four vertical spindles, D, lever clutches, D2, movable by screw
spindles and handwheels, D3, being provided for engaging and disengaging the
spindles, D, and pinions, DI, accordingly as the operation of each is or is
not required. Each of the four spindles, D, by bevil wheels, D 4, drives two
pulleys, E, which act on an endless rope, E 1, stretched by a weighted pulley, G,
suspended in a loop of the rope extending down from the inner sides of the pulleys, E.
The two parts of the rope, E 1, pass from the outer sides of the pulleys, E, under
guide pulleys, E 2, and thence horizontally outwards along a pair of arms, H, to
guide pulleys, E 3, on those arms, from which pulleys, E 3, the loop of rope extends
downwards to the screw-tapping or other tool, J. The arms, H, are centered on
pins, H 1, fixed in the lower frame plate, B 3, on which plate the inner ends of the
arms rest. The pulleys, E 3, are carried by small saddles, H 2, fitted to slide on
the arms, H, and the two saddles, H 2, of each pair of arms are connected by a
link, H 3, jointed to them, this link, in combination with the arms, forming a
parallel motion which can be set in any one of a variety of positions to suit the part
of the work which is being operated on, as indicated in Figures, 1, and 4.
In addition to the pairs of arms, H, being movable into different positions, the
pulley saddles, H 2, can be adjusted inwards or outwards along the arms, for which
purpose each saddle has tapped through it a screw spindle, H 4, carried by the
arm and the two screw spindles of a pair of arms, can be turned by bevil
gearing, H 5, at the ends of the arms, this bevil gearing being acted on by means
of a horizontal spindle, H 6, having on it a pulley, Ħ 7, from which depends an
endless handing rope or chain, H 8.
The screw-tapping or other tool, J, may be varied in construction to suit various
operations and requirements. As shown in the drawings, it consists of a simple
open-topped box or casing, J, having within its upper part a pulley round which
the driving rope, E 1, passes, the spindle of the pulley having fast on it a pinion
gearing with a spur-wheel on the spindle, J 1, which passing through the side of
the box, has adapted to it the screw tap, J 2, or other instrument. The gearing
within the box, J, may be arranged in various ways, and so as-for example-to
actuate a tap spindle or other spindle, at a bottom corner or other part of the box,
in order to enable the tool to operate in confined spaces. The drawings show the
machinery as adapted for screw-tapping the stay holes of the firebox end of a loco-
motive boiler; and one tool, J 3, is shown as suitable for operating on the forward
part of the firebox and close to the barrel of the boiler. In Figure, 2, the
tools, J, J 3, are shown in edge view, separate face views being added at the sides
of two of the tools.
In Figure, 4, three locomotive boilers, L, are shown as placed for being operated
on; and my improved machinery, one set of which is sufficient for operating in the
three positions, has its carrier beams, A, springing from a middle position, whilst
it is shown as adjusted for operating on a boiler, L, in one of the outer positions.
Whilst one boiler, L, is being thus operated on a second may be being removed
and a third may be being placed in position ready for being operated on next.
If found desirable more than two connected carrier beams, A, may be employed;
there may also, in each case, be more than two arms, 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 construction, combination, and arrangement of parts constituting as a
whole my improved machinery for carrying, driving, and applying screw-tapping
or other rotating tools, substantially as hereinbefore described and shown in the
accompanying drawings.
2. In machinery for screw-tapping and like operations, pairs of parallel carrying
arms centered and angularly adjustable on a frame, combined with means of

page_text: adjusting the parts carried outwards or inwards along the arms, substantially as
herein before described.
3. In machinery for screw-tapping and like operations, a frame carrying parts
such as those referred to in the second claim and driving gearing, such frame being
connected to and supported by a pair of parallel carrier beams, and the whole
arranged and operating substantially in the manner and for the purposes hereinbefore
described.
Dated this Thirtieth day of March 1803
EDMUND HUNT,
Applicant's Agent.