AN IMPROVED COMPOUND MATERIAL FOR PACKING FOR VALVES.
Year: 1875

page_text: LETTERS PATENT to William Henry Hornsby, of Portland Place, in
the County of Middlesex, Engineer, for the Invention of "AN
IMPROVED COMPOUND MATERIAL FOR PACKING FOR VALVES.
"
IMPROVED COMPOUND MATERIAL FOR PACKING FOR VALVES.
"
PROVISIONAL SPECIFICATION left by the said William Henry
Hornsby at the Office of the Commissioners of Patents, with his
Petition, on the 27th August 1875.
I, WILLIAM HENRY HORNSBY, of Portland Place, in the County of
Middlesex, Engineer, do hereby declare the nature of my said Inven-
tion for "AN IMPROVED COMPOUND MATERIAL FOR PACKING FOR VALVES," to be
as follows:
This Invention relates to an improved packing for valves, particularly
applicable to valves which are subjected to hot water under pressure,
but also applicable to valves used for cold water purposes, and consists
in the application to such purposes of a compound of hard india-rubber,
commonly called vulcanite or ebonite, and of ordinary vulcanized india-
rubber, which as is well-known retains the elasticity of ordinary india-
rubber. This compound material when applied to the purposes of this

page_text: Invention is made with a larger proportion of the hard than the soft
material, the soft material being sufficient in thickness to give the
amount of elasticity required under pressure, whilst the hard portion
of the material gives a strong support to the soft, and prevents its
being rapidly acted upon by the hot water to which it is exposed.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Henry Hornsby in the Great Seal Patent
Office on the 22nd February 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HENRY HORNSBY, of Portland Place, in the County of Middlesex,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of August, in
the year of our Lord One thousand eight hundred and seventy-five,
in the thirty-ninth year of Her reign, did, for Herself, Her heirs
and successors, give and grant unto me, the said William Henry
Hornsby, Her special license that I, the said William Henry Hornsby,
my executors, administrators, and assigns, or such others as I, the
said William Henry Hornsby, my executors, administrators, or 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 "AN IMPROVED COMPOUND MATERIAL FOR
PACKING FOR VALVES," upon the condition (amongst others) that I, the
said William Henry Hornsby, my executors or administrators, by an
instrument in writing under my hand and seal, 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 William Henry Hornsby, do hereby
declare the nature of my said 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:― :

page_text: This Invention relates to an improved packing for valves, particularly
applicable to valves which are subjected to hot water under pressure,
but also applicable to valves used for cold water purposes, and consists
in the application to such purposes of a compound of hard india-rubber,
commonly called vulcanite or ebonite, and of ordinary vulcanized india-
rubber, which as is well known retains the elasticity of ordinary india-
rubber. This compound material when applied to the purposes of this
Invention, may be made with a larger proportion of the hard than
the soft material, the soft material being sufficient in thickness to give
the amount of elasticity required under pressure, whilst the hard portion
of the material gives a strong support to the soft, and prevents its
being rapidly acted upon by the hot water to which it is exposed.
In carrying out my Invention I cause either a sheet or disc of vul-
canite or ebonite to be made to adhere by means of any suitable
adhesive material or varnish, such for example as a solution in soluble
solvents of india-rubber, either directly to a layer or sheet of vulcanized
india-rubber, or to an intermediate sheet, layer, or disc of semi-vulcanite
or other material, and when such material or materials as before-
mentioned have become adherent, and the whole or practically the
whole of the solvent has been expelled or evaporated, I then employ
such compound materials for the purposes above-mentioned.
Having now described and particularly ascertained the nature of my
said Invention, and the manner in which the same is or may be used or
carried into effect, I would observe in conclusion that what I consider to
be novel and original and therefore claim as the Invention secured to me
by the herein-before in part recited Letters Patent is, an improved
packing for valves to be used in connection with hot or cold water or
other fluid, the same composed of vulcanite or cbonite, together with
elastic vulcanized india-rubber, whereby combined rigidity and elasticity
are obtained, as herein-before described.
In witness whereof, I, the said William Henry Hornsby, have
to this my Specification set my hand and seal, the Ninth day
of December, One thousand eight hundred and seventy-five.