IMPROVEMENTS IN THE MANUFACTURE OF TWISTED METALLIC TUBES
Year: 1862

page_text: LETTERS PATENT to James Thomas Grice, of Birmingham, in the County
of Warwick, Tube Maker, for the Invention of "IMPROVEMENTS IN THE
MANUFACTURE OF TWISTED METALLIC TUBES."
Sealed the 24th June 1862, and dated the 11th April 1862.
PROVISIONAL SPECIFICATION left by the said James Thomas Grice
at the Office of the Commissioners of Patents, with his Petition, on the
11th April 1862.
I, JAMES THOMAS GRICE, of Birmingham, in the County of Warwick,
Tube Maker, do hereby declare the nature of the said Invention for "Im-
IN THE MANUFACTURE OF TWISTED METALLIC TUBES," to be as
follows:-
My Invention consists, firstly, in filling the tube to be twisted with pitch,
lead,, or sand, or other yielding substance, whether solid or in powder, and
afterwards twisting the tube thus filled by fixing one end of the tube in a die
or holding tool and taking hold of the other end by means of plyers or other
tools and applying a rotatory force thereto.. Or a rotatory force may be applied
to both ends of the tube, the motions being in opposite directions. The required.
twist or helical figure is thus given to the tube. After the tube has been
twisted the filling material is removed by fusion or otherwise according to the
nature of the filling material employed.
My Invention consists, secondly, in placing in the tube to be twisted a small
rod or mandril of steel or other hard unyielding metal or material instead of.
completely filling the tube with a yielding material. The said rod or mandril

page_text: is of much smaller diameter than the tube to be twisted, that is, the said rod
or mandril must have a diameter not greater than the diameter of the smallest
part of the twisted tube to be made. The tube is twisted upon the small hard
mandril in the same manner as that described when a yielding material is
employed in the tube. By the use of a yielding material or a hard mandril of
small diameter in the metallic tube to be twisted, the said tube is prevented
from collapsing while being twisted and a very uniform twist is given to the
tube. As the surface of the tube is untouched during the twisting process my.
Invention is especially applicable to the twisting of tubes the surfaces of
which have been ornamented previous to twisting.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Thomas Grice in the Great Seal Patent
Office on the 3rd October 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
THOMAS GRICE, of Birmingham; in the County of Warwick, Tube Maker; send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of April, in the year of our Lord.
One thousand eight hundred and sixty-two, in the twenty-fifth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said James Thomas Grice, Her special licence, that I, the said
James Thomas Grice, my executors, administrators, and assigns, or such
others as I, the said James Thomas Grice, my 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 THE MANUFACTURE OF TWISTED METALLIC
TUBES," upon the condition (amongst others) that I, the said James Thomas
Grice, my executors or administrators, by an instrument in writing under
my, or their, or one of their hands and seals, 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.
NOW KNOW YE, that I, the said James Thomas Grice,. do hereby
declare the nature of the said Invention, and in what manner the same is to

page_text: be performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:-
My Invention relates to the manufacture of metallic tubes of the kind
commonly known in commerce as twisted tubes, that is to say, tubes in which
a convex or concave flute or other pattern is arranged in the form of a helix.
The said tubes may be manufactured by taking tubes on which the flute or
pattern is made in lines parallel with the axes of the tubes and twisting the
said tubes by holding one end, stationary and giving a rotatory motion to the
other end, or by giving rotatory motions in opposite directions to the opposite
ends of the tubes. It frequently happens that the tubes offer less resistance at
some parts than at others, and yield irregularly to the force applied. In this
case the twisted pattern produced is not uniform or regular. The object of
my Invention is to prevent this irregular yielding of the tube while it is being
twisted.:
.
My Invention consists, firstly, in filling the tube to be twisted with pitch, or
lead, or sand, or other yielding substance, whether solid or in powder, and
afterwards twisting the tube thus filled by fixing one end of the tube in a die
or holding tool, and taking hold of the other end by means of plyers or other
tools and applying a rotatory force thereto. Or a rotatory force may be applied
to both ends of the tube, the motions being in opposite directions. The
required twist or helical figure is thus given to the tube. After the tube has
been twisted the filling material is removed by fusion or otherwise according
to the nature of the filling material employed.
My Invention consists, secondly, in placing in the tube to be twisted a small
rod or mandril of steel or other hard unyielding metal or material instead of
completely filling the tube with a yielding material. The said rod or mandril
is of much smaller diameter than the tube to be twisted, that is, the said rod or
mandril must have a diameter not greater than the diameter of the smallest
part of the twisted tube to be made. The tube is twisted upon the small
hard maudril in the same way as that described when a yielding material is
employed in the tube. By the use of a yielding material, or a hard mandril
of small diameter in the metallic tube to be twisted, the said tube is prevented
from collapsing while being twisted and a very uniform twist is given to the
tube. As the surface of the tube is untouched during the twisting process,
my Invention is especially applicable to the twisting of tubes, the surfaces of
which have been ornamented previous to twisting.
Having now described the nature of my Invention, and the manner in which
the same is to be performed, I wish it to be understood that I do not limit
myself to the precise details herein described, as the same may be varied

page_text: without departing from the nature of my Invention, but I claim as my In-
vention the improvements in the manufacture of twisted metallic tubes herein-
before described, that is to say, filling the tube to be twisted with a yielding
substance either, solid or in powder, or' inserting in the tube to bè twisted a
small solid mandril of steel or other hard substance for the purpose of
preventing the irregular yielding of the tube during the twisting process.
In witness whereof, I, the said James Thomas Grice, have hereunto
set my hand and seal, this Second day of October, in the year of our
Lord One thousand eight hundred and sixty-two.
Witness,
GEORGE SHAW.
JAMES THOMAS GRICE. (L.S.)