IMPROVEMENTS IN MACHINERY FOR MANUFACTURING TUBES FOR TUBULAR STEAM BOILERS
Year: 1860

page_text: LETTERS PATENT to Charles Green, of Birmingham, Patent Tube Manu-
facturer, and William Asbury, also of Birmingham, Engineer, for the
Invention of "IMPROVEMENTS IN MACHINERY FOR MANUFACTURING TUBES FOR
TUBULAR STEAM BOILERS."
:
Sealed the 18th January 1861, and dated the 15th August 1860.
PROVISIONAL SPECIFICATION left by the said Charles Green and
William Asbury at the Office of the Commissioners of Patents, with
their Petition, on the 15th August 1860.
We, CHARLES GREEN, of Birmingham, Patent Tube Manufacturer, and;
WILLIAM ASBURY; also of Birmingham, Engineer; do hereby declare the:
nature of the Invention for " IMPROVEMENTS IN MACHINERY FOR MANUFACTURING,
TUBES FOR TUBULAR STEAM BOILERS," to be as follows:-
:
This Invention has for its object improvements in machinery for manufac-.
turing tubes for tubular steam boilers. For these purposes, tubes suitable for)
tubular flues of steam boilers having been made in the ordinary manner, are
caused to be indented in a spiral direction by machinery arranged in the fol..
lowing manner: Each tube is plugged or filled at its two ends with plugs,
and then mounted in a lathe constructed and arranged in such manner as to
cause the tube to rotate; and at the same time to give motion to a sliding rest, :
which has a cylindrical passage through it corresponding with the external:

page_text: diameter of the tube, and allowing the tube to pass through and turn therein.
An opening is formed in the side of the sliding rest to admit of a roller or
pressing tool being constantly pressed against the tube, and such pressing tool
travels with the sliding rest. By these means a spiral indent is formed around
the tube, the inclination of such spiral indent to the central axis of the tube
depending on the speed at which the tube is caused to rotate compared with
the speed at which the sliding rest and pressing tool are caused to move along
the tube. The two ends of each of the tubes may be left for any length
without any spiral indent, and consequently the spiral indent around each tube
may occupy a greater or less length of the tube.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Charles Green and William Asbury in the Great Seal Patent
Office on the 15th February 1861.
TO ALL TO WHOM-THESE PRESENTS SHALL COME, we, CHARLES
GREEN, of Birmingham, Patent Tube Manufacturer, and WILLIAM- ASBURY,
also of Birmingham, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her. Letters
Patent, bearing date the Fifteenth day of August, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-fourth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
Charles Green and William Asbury, Her special licence that we, the said
Charles Green and William Asbury, our executors, administrators, and
assigns, or such others as we, the said Charles Green and William Asbury,
our executors, administrators, and assigns, should at any time agree with,
and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention" for "IMPROVEMENTS IN MACHINERY.
FOR MANUFACTURING TUBES FOR 'TUBULAR STEAM BOILERS," upon the condition
(amongst others) that we, the said Charles Green and William Asbury, our
executors or administrators, by an instrument in writing under our or- their
hands and seals, or under the hand and seal of one of us, or them; should:
particularly describe and ascertain the nature of the said Invention, and in.
what manner the same was to be performed, and cause the same to..be.
filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.

page_text: NOW KNOW. YE, that I, the said Charles Green, on behalf of myself
and the said William Asbury, do hereby declare the nature of the said
Invention, and in what manner the same is to be performed, to be parti-
cularly described and ascertained in and by the following statement thereof,
that is to say:-
•
This Invention has for its object improvements in machinery for manu-
facturing tubes for tubular steam boilers. For these purposes tubes suitable
for tubular flues of steam boilers having been made in the ordinary manner
'are caused to be indented in a spiral.direction by machinery arranged in the
following manner :-Each tube is plugged or filled at its two ends with plugs,
and then mounted in a lathe constructed and arranged in such manner as to
cause the tube to rotate, and at the same time to give motion to a sliding
rest, which has a cylindrical passage through it corresponding with the external
diameter of the tube, and allowing the tube to pass through and turn therein.
An opening is formed in the side of the sliding rest to admit of a roller or
pressing tool being constantly pressed against the tube, and such pressing tool
travels with the sliding rest. By these means a spiral indent is formed
around the tube, the inclination of such spiral indent to the central axis of
the tube depending on the speed. at which the tube is caused to rotate com-
pared with the speed at which the sliding rest and pressing tool are caused to
move along the tube. The two ends of each of the tubes may be left for
any length without any spiral indent, and consequently the spiral indent
around each tube may occupy a greater or less length of the tube.
Having thus stated the nature of our Invention, we will proceed more fully
to describe the nature of performing the same.
DESCRIPTION OF THE DRAWINGS.
b
:
Figure 1 is a front view; Figure 2 a plan, and Figure 3 a section of an
instrument used in combination with a lathe in carrying out the Invention.
The instrument a is fixed to a slide rest of a lathe, and moves with it. The
centre line of the opening 6 through the head of the instrument a coincides
with the centres of the lathe about which the tube is by the working of the
lathe caused to rotate. Through the front of the upper part of the instru-
ment a is formed a slot or opening to receive and allow the periphery of the
roller d to press more or less on to the tube e according as it is desired to
make the spiral groove in the tube more or less deep. The roller d is carried
by a handle d', which, as before stated, is fixed in the holder of the slide rest
of the lathe in like manner to that in which other tools are fixed to the slide
rests of lathes. The tube e, before being placed in a lathe, is plugged at its

page_text: tivo ends, and it is caused to rotate in the lathe.in the ordinary manner, and
according to the speed of rotation of the tube, and the rate at which the slide
rèst with the instrument a' is moved along the. bed of the lathe, so will the
spiral indent or groove' formed in the tube be inclined more or less to the axis
of the tube. By the ordinary gearing of lathes, it is well-known that the
relative speeds of the rotation of the work and of the sliding of the rest may
be varied, and such variations will be made in respect to the gearing according
to the angle it is desired to give the spiral groove or indent of each tube.
Having thus: described the nature of our Invention, and the manner of
performing the same, we would have it understoood that what we claim is,
the application of the apparatus herein. described to lathes for manufacturing
tubes for tubular boilers.
In witness whereof, I, the said Charles Green, have hereunto set my
hand and seal, this Fourteenth day of February, in the year of our
Lord One thousand eight hundred and sixty-one.
CHLADIES CREEN