Improvements in Sheet Packing for Steam-pipe and other Joints.
Year: 1889

page_text: Date of Application, 30th May, 1889
Complete Specification Left, 25th Feb., 1890-Accepted. 12th Apr. 1890
PROVISIONAL SPECIFICATION.
Improvements in Sheet Packing for Steam-pipe and other Joints.
We, ROBERT WILLIAM HENRY MCDOWELL, of Salters Court, Bow Lane, in the
city of London, Manufacturer, and CHRISTIAN LUDVIG ENGOLF MELSOM, of
1, Regency Square, Kennington, in the county of Surrey, Engineer, do hereby
declare the nature of this invention to be as follows:
1
Our invention relates to an improved sheet packing for making steam pipe joints
and other connections.
In carrying out our invention we take india rubber compound of suitable quality to
which we add asbestos, the whole being thoroughly mixed together so as to form a
homogeneous mass; we then take a sheet of wire gauze and spread or roll the india
rubber and asbestos mixture upon each side thereof to the required thickness, the
surface is then covered on one or both sides with graphite which is pressed into the
plastic rubber and the whole is vulcanized in the well known manner. The object of
thus preparing the surface with graphite is to render it non-adhesive to the metal of
the flange joints.
The wire gauze is by preference placed in the centre, but it may be put in any
other position.
In cases where great flexibility is required cloth of linen, cotton, asbestos or other
textile material may be used instead of the wire gauze.
By the use of our improved packing a great saving is effected owing to the fact
that joints can be repeatedly broken without causing injury to the material, which
will retain its flexibility and strength indefinitely, being practically indestructible by
heat and unaffected by moisture. Also stoppages of machinery during working hours
owing to defective joints is extremely unlikely, and stoppages for overhauling purposes
either on land or at sea are considerably shorter than when ordinary packing is used
in consequence of being able to use the old packing over again instead of having to
fit a new ring or the like each time a joint is broken.
Dated the 20th Ja
M
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Sheet Packing for Steam-pipe and other Joints.
We, ROBERT WILLIAM HENRY MCDOWELL, of Salters Court, Bow Lane, in the
city of London, Manufacturer, and CHRISTIAN LUDVIG ENGOLF MELSOM, of
1, Regency Square, Kennington, in the county of Surrey, Engineer, 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:-
Our invention relates to an improved non-adhesive sheet packing for making steam
pipe joints and other connections.
In carrying out our invention we take india rubber compound of suitable quality to
which we add asbestos, the whole being thoroughly mixed together so as to form a
homogeneous mass; we then take a sheet of wire gauze and spread or roll the india
rubber and asbestos mixture upon each side thereof to the required thickness, the
surface is then covered on one or both sides with graphite which is pressed into the
plastic rubber and asbestos compound and the whole is vulcanized in the well known
manner. The object of thus preparing the surface with graphite is to render it non-
adhesive to the metal of the flange joints.

page_text: The wire gauze is by preference placed in the centre but it may be put in any other
position.
In some cases where great flexibility is required cloth of linen, cotton, asbestos or
other textile material may be used instead of the wire gauze.
By the use of our improved packing a great saving is effected owing to the fact
that, the packing being non-adhesive, joints can be repeatedly broken without causing
injury to the material which will retain its flexibility and strength indefinitely, being
practically indestructible by heat and unaffected by moisture. Also stoppage of
machinery during working hours owing to defective joints is extremely unlikely, and
stoppages for overhauling purposes either on land or at sea are considerably shorter
than when ordinary packing is used in consequence of being able to use the old
packing over again instead of having to fit a new ring or the like each time a joint is
broken.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The manufacture and use of the described non-adhesive sheet packing for steam
pipe and other joints, such packing being made by coating wire gauze or a suitable
textile fabric with a compound of india rubber and asbestos and, after covering the
surfaces with graphite, vulcanizing the whole, substantially as set forth.
Dated the 25th day of February 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.