Improved Engine Packing.
Year: 1897

page_text: Improved Engine Packing.
I, HARRY GORDON HOLROYD, trading as The Lancashire Mill Furnishing
Company, of Corporation Street, Manchester, in the County of Lancaster, Mill
Furnisher, do hereby declare the nature of this invention to be as follows:-
This invention is designed to provide a packing for piston rods that will retain
its elasticity for months on rods working at high pressures and speeds, and will
present a yielding metallic surface to the piston rod.
The packing comprises in its structure, three parts or sections running longi-
tudinally.
1. A yielding metallic surface for contact with the piston rod.
2. An elastic section to bear against the stuffing box.
3. A filling interposed between the elastic and metallic sections.
The metallic section is composed of a band or layer or braid of metal wire (pre-
ferably lead wire) woven or embedded into asbestos yarn or strip of asbestos
fabric, so as to bind the wire into the form of a band.
The elastic section is composed of a strip of heat and grease resisting rubber,
of a very flexible or elastic nature. This rubber is further protected from the
heat of the stuffing box, and the action of grease, by being enclosed in a grease
proof cover, and a non-heat conducting cover of asbestos cloth.
The space between the elastic and metallic sections is filled with a roll of asbestos
cloth or fabric to make up the required thickness of packing. The three sections
of the packing are bound or held together by an envelope or covering of asbestos
cloth or fabric cemented thereto, or this outer covering may be a layer of the
filling roll.
The packing is preferably approximately square in cross section, but somewhat
thicker or broader on the outside than on the inside, so that the metallic surface
may be pressed to the rod without destroying its formation.
11. 09 of Santowbar 1897
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
Improved Engine Packing.
I, HARRY GORDON HOLROYD, trading as The Lancashire Mill Furnishing
Company, of Corporation Street, Manchester, in the County of Lancaster, Mill
Furnisher, do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
--
This invention is designed to provide a packing for piston rods that will retain

page_text: its elasticity for a considerable period on rods working at high pressures and
speeds and will present a yielding metallic surface to the piston rod.
It will be fully described with reference to the accompanying drawings.
Fig. 1, transverse section.
Fig. 2, transverse sections of the component parts of the packing taken
separately.
Fig. 3, sketch showing the material or fabric forming the metallic part of the
packing.
The packing comprises in its structure three parts or sections A, B, C, running
longitudinally encased in an outer covering or wrapper D, viz.;
1. A yielding metallic surface A for contact with the piston rod.
2. An elastic section B to bear against the stuffing box.
3. A filling C interposed between the elastic and metallic sections.
The metallic section A is composed of a roll of metallic fabric in which strips of
metallic wire a preferably lead wire or soft composition are interwoven with
asbestos yarn or embedded in a strip of asbestos fabric so as to hold the wire in
position.
The elastic section B is composed of a strip of heat and grease resisting rubber
or rubber composition of a very flexible or elastic nature. This rubber or com-
position is further protected from the heat of the stuffing box and the action of
grease, by being enclosed in a grease proof cover and a non-heat-conducting
cover of asbestos cloth.
The space between the elastic section B and metallic sections A is filled with a
roll C of asbestos cloth or fabric to make.up the required thickness of packing.
The three sections of the packing are bound or held together by an envelope
or covering D of asbestos cloth or fabric cemented thereto.
In constructing the packing the three sections are taken separately as shown
in Fig. 2 and the metallic section A and the intermediate or filling section C are
wound flat or oval as shown so that by applying pressure at the sides thereof they
will expand or press outwards in the direction from top to bottom thus ensuring
the maintaining of the packing tight when in position until completely worn
away.
The packing is preferably approximately square in cross section but somewhat
thicker or broader on the outside than on the inside, so that the metallic surface
may be pressed to the rod without destroying its formation.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is: -
1. An improved engine packing constructed of three separate layers or sections
comprising a metallic surface at the inside and elastic surface at the outside with
an intermediate or filling material between built up separately in rolls so that
by compressing the sides pressure is applied by the face substantially as described
and shown.
2. An improved engine packing constructed and arranged in separate sections
substantially as described and illustrated with reference to the drawings.
Dated this 16th day of June 1898.
WM. P. THOMPSON & Co.,
Manchester, Liverpool & London, Patent Agents.