IMPROVEMENTS IN PACKING FOR PISTON RODS: SPINDLES. AND OTHER SIMILAR MOVING PARTS OF MACHINERY REQUIRING TIGHT JOINTS " PROVISIONAL SPECIFICATION
Year: 1883

page_text: LETTERS PATENT to Robert Henry Harper of 6 Billiter Street in the City of
London and James Henry Chapman of Forest Gate in the County of Essex
for an Invention of "IMPROVEMENTS IN PACKING FOR PISTON RODS: SPINDLES.
AND OTHER SIMILAR MOVING PARTS OF MACHINERY REQUIRING TIGHT JOINTS
"
PROVISIONAL SPECIFICATION left by the said Robert Henry Harper and
James Henry Chapman at the Office of the Commissioners of Patents on the
18th August 1883.
ROBERT HENRY HARPER, of 6 Billiter Street, in the City of London, and JAMES
HENRY CHAPMAN, of Forest Gate, in the County of Essex, "IMPROVEMENTS IN
PACKING FOR PISTON RODS, SPINDLES, AND OTHER SIMILAR MOVING PARTS OF
MACHINERY REQUIRING TIGHT JOINTS"
This Invention relates to that class of steam or other packing ordinarily known
as solid or core packing which consists of a central core of india rubber surrounded
with canvas or other fibrous material. When packing so constructed is subjected
to great pressure or high temperature, or when brought into contact with certain
chemicals, the central core is forced out through the surrounding fibrous material,
and, coming in contact with the piston rod or other moving part, causes damage
thereto by heating and scoring; the packing also thereby loses its elasticity.
According to the present Invention, the packing consists of a central core of
cork, perforated or not as desired, of round, square or other desirable section, with
an outer covering, casing, envelope, or tube of Asbestos, or other suitable woven
fibrous material, or a combination of woven and spun fibrous material of any
desired degree of coarseness, to come into contact with the piston rod or other
moving part. This outer covering, casing, envelope, or tube may consist of one or
more thicknesses, or it may be cured together with india rubber solution or other
[Price 1

page_text: suitable means, or applied to the cork core before curing. In some cases the outer
casing, envelope, or tube may be formed of hemp, asbestos, or any other suitable
material by what is known as over-spinning, or weaving in a similar manner to
that in which whip handles are covered, and in this case the intermediate covering
of canvas or other fibrous material may be dispensed with or not as preferred.
Packing constructed according to this Invention is specially applicable for acid
and other chemical pumps, or for engines where superheated steam is used, or great
pressures are maintained, as the cork core will not be affected by the chemicals, and
will stand a much higher degree of heat than india rubber and will moreover
maintain its elasticity.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Robert Henry Harper and James Henry Chapman in the Patent
Office on the 18th February 1884.
ROBERT HENRY HARPER of 6 Billiter Street, in the City of London and JAMES
HENRY CHAPMAN of Forest Gate in the County of Essex "IMPROVEMENTS IN
PACKING FOR PISTON RODS, SPINDLES, AND OTHER SIMILAR MOVING PARTS OF
MACHINERY REQUIRING TIGHT JOINTS
"
This invention relates to that class of steam or other packing ordinarily known
as core packing which consists for example of a central core of india rubber
surrounded with canvas or other fibrous material. When packing so constructed is
subjected to great pressure or high temperature, or when brought into contact with
certain chemicals, the central core is sometimes forced out through the surrounding
fibrous material and coming in contact with the piston rod or other moving part.
causes damage thereto by heating and scoring, the packing also thereby loses its
elasticity.
According to the present invention, the packing consists of a central core of
cork, perforated or not as desired, of round, square or other desirable-section, with
an outer covering, casing envelope or tube of asbestos or other suitable woven
fibrous material, or a combination of woven and spun fibrous material of any
desired degree of coarseness, to come into contact with the piston rod or other
moving part. This outer covering, casing, envelope, or tube may consist of one or
more thicknesses, or it may be cured together with india rubber solution or other
suitable means, or applied to the cork core before curing. In some cases the outer
covering, casing, envelope, or tube may be formed of hemp, asbestos, or any other
suitable material by what is known as over spinning or weaving in a similar
manner to that in which whip handles are covered and in this case the intermediate
covering of canvas or other fibrous material may be dispensed with or not as
preferred.
The covering, casing, envelope or tube may also be composed of the aforesaid
woven or spun fibrous materials combined with metal in any suitable form such as
sheets, wires, gauze and so forth, or it may be composed wholly of metallic sheets,
wires, gauze or metal in other suitable form, and such compound or metallic covering
may itself be covered by over spinning or weaving in the same way as that above
described for the formation of the covering, casing, envelope or tube from hemp,
asbestos or other suitable material.
Packing constructed according to this invention is specially applicable for some
kinds of acid and other chemical pumps, or for engines where superheated steam
is used or great pressures are maintained, as the cork core will not be affected and
will stand a much higher degree of heat than india rubber and will moreover
maintain its elasticity.
Having now described the nature of the said invention and the manner in which
the same is to or may be carried into effect, we would have it understood that
what we claim is:
First. In core packing the combination of a central core of cork with an outer
covering, casing, envelope, or tube of woven or spun fibrous. material, or
combinations of such woven or spun materials or of metal either alone or
combined with woven or spun fibrous material substantially as herein before
Jaanihad

page_text: Second. In core packing the combination of a central core of cork with an over
spun or over woven covering, casing, envelope or tube substantially as
hereinbefore described.
In Witness whereof, I, the said Robert Henry Harper for myself and on behalf
of James Henry Chapman have hereunto set my hand and seal this sixteenth
day of February in the year of Our Lord One thousand eight hundred and eighty
four
ROB H HARPER (L.S.)