IMPROVEMENTS IN THE MANUFACTURE OF TWISTED METAL BARS TO FORM AUGERS AND DRILLS, AND AN IMPROVED COMPOSITE MACHINE FOR TWISTING SUCH AUGERS AND DRILLS, FOR SCREW CUTTING, AND FOR CUTTING METAL RODS, BARS AND TUBES
Year: 1870

page_text: PROVISIONAL SPECIFICATION left by Martin Macdermott and Arthur
David Williams at the Office of the Commissioners of Patents, with
their Petition, on the 11th February 1870.—A communication from
abroad by Monsieur Jean Boulay, of Autun, in the Empire of
France.
We, MARTIN MACDERMOTT, of 18, Edwardes Square, Kensington, in
the County of Middlesex, Architect, and ARTHUR DAVID WILLIAMS, of
49, Upper Brook Street, in the City of Westminster, Civil Engineer, do
hereby declare the nature of the said Invention for "IMPROVEMENTS IN
THE MANUFACTURE OF TWISTED METAL BARS TO FORM AUGERS AND DRILLS, AND
AN IMPROVED COMPOSITE MACHINE FOR TWISTING SUCH AUGERS AND DRILLS, FOR
SCREW CUTTING, AND FOR CUTTING METAL RODS, BARS, AND TUBES," to be as
follows:
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The improvements in the manufacture of twisted metal bars are
effected by machinery, of which the following is a description :—
The machinery consists (see Sheet of Drawings, of which No. 1 is a
longitudinal section); firstly, of cast-iron framework in three-parts, of
which the two at one end A and A' connected together support a

page_text: drum B of varying diameter for driving the machine, which drum is
placed in the interval between these frames. Fixed on the same axlo
as the drum and at one end of it is an endless. screw. O; at the other end
is a cog wheel D, which works in another cog, wheel of greater diameter
E, the latter being fixed on a hollow shaft working in bearings upon
the standards A and A. One end of the hollow shaft just mentioned
is formed into or has attached to it a circular disc G, the vertical axis.
of which coincides with that of the endless screw. This disc is slotted
on the face to receive moveable jaws or clips. Gearing with the endless
screw C is a helicoidal cog.wheel H, which is fixed on an axle I at right
angles to the axle of the drum and supported on, bearings, attached to.
the cast-iron frame A'. At each extremity of the axle I is fixed a spur
wheel. The cast-iron frames A¹ and A" are connected together by
means of three pairs of wrought-iron rods marked respectively J, K,,
and L. Two spur wheels placed directly over the spur wheels. last
mentioned are attached to the pair of connecting rods J, and a third'
pair of spur wheels is attached to the extremities of an axle M. fixed in
the cast-iron standard A". Working round the three spur wheels
already described at each side of the standards is a chain N (that is to
say, one chain at each side of the standards). The ends of the chains
last mentioned are attached to a traveller of special construction O
which slides along the pair of connecting rods J, the said traveller
being furnished with apparatus for holding or gripping the bar to be
twisted, and also for screw cutting and for cutting bars, rods, or tubes...
Resting upon the connecting rods K and extending in length over the
interval between tho standards A¹ and A" is a metal trough furnished
with an outlet pipe, and over this trough is fixed a series of water pipes
with perforations on their circumferences at the end nearest the disc G.
The operation of the machine is as follows:-Motion is given to the
machine by means of a driving band over the drum B, and this motion
is transmitted by the endless screw C to the shaft I and the chains
which are in connection with it, and by means of the cog wheels D
and E to the hollow shaft F. Then for the operation of twisting bars
a special chuck containing rollers suitable to the size of the bar to be
twisted having been inserted in the disc G, and fixed therein by means
of the moveable jaws or clips already referred to, the machine is set in
motion, and the bar to be twisted heated to the required temperature is
passed through the hollow shaft F and between the rollers in the chuck;

page_text: it is then attached by its extremity to the special traveller O, and being
drawn forward by the motion of the traveller at the same time that
it is revolving on its own axis, these combined motions give the bar a
spiral twist, which is continued throughout its entire length. The pitch
of the spiral depends on the relative velocities of the traveller and of the
roller chuck, through which the bar passes, these relative velocitics
being variable by means of a series of different sized spur wheels over
which the chains work, and which can be changed as may be necessary.
By means of the water pipes already mentioned jets of water are con-
tinuously thrown on the bar as it emerges twisted from the rollers,
thus maintaining the regularity of the spiral throughout the entire
length of the bar.
Secondly. For screw cutting one end of the bar is fixed to the disc G,
and a screw cutting apparatus being fixed on the traveller O receives
the bar at its other end, the necessary sized spur wheels having been
attached to suit the required pitch of screw. The machine being sct
in motion the traveller advances towards the disc, cutting the screw as it
advances,
If the machine is required for cutting rods, bars, or tubes, the chains
are detached from the traveller and the necessary cutting tool is fixed
in the same. The metal to be operated on is attached to the disc G,
from which it receives a rotary motion, and the tool being brought into
contact with the metal the latter is out as required.