CERTAIN IMPROVEMENTS IN JOINTS FOR EARTHENWARE AND CAST-IRON PIPES FOR SANITARY DRAINAGE AND OTHER LIKE PURPOSES
Year: 1878

page_text: LETTERS PATENT to Edward Pritchard, of 27, Great George Street, West-
minster, in the County of Middlesex, Civil Engineer, for the Invention of
"CERTAIN IMPROVEMENTS IN JOINTS FOR EARTHENWARE AND CAST-IRON PIPES
FOR SANITARY DRAINAGE AND OTHER LIKE PURPOSES."
Sealed the 25th February 1879 in pursuance of an Order of the Lord Chancellor,
and dated the 19th August 1878.
PROVISIONAL SPECIFICATION left by the said Edward Pritchard at the
Office of the Commissioners of Patents on the 19th August 1878.
EDWARD PRITCHARD, of 27, Great George Street, Westminster, in the County of
Middlesex, Civil Engineer. "CERTAIN IMPROVEMENTS IN JOINTS FOR EARTHEN-
WARE AND CAST-IRON PIPES FOR SANITARY DRAINAGE AND OTHER LIKE PURPOSES."
My improved joint consists substantially in moulding, casting, or otherwise
permanently attaching upon the spigot end of the pipe two or more half threads,
the inside of the socket of the pipe to which it is to be attached being moulded or
cast with corresponding grooves. There is also provided a collar upon the spigot
end.
.
A complete joint is formed by covering the spigot and socket ends of the pipe
with a layer of cement or other quick setting substance of a like character, and
screwing the two pipes together. By a slight turn or rotation of the pipes or either
of them on their axis the connection is made.
Instead of moulding, casting, or otherwise permanently attaching the threads
upon the spigot end of the pipe the said pipe may be moulded or cast without any
threads thereon, and instead thereof may be provided with suitable grooves, in
which threads are afterwards placed and secured.
These threads may be of steel, iron, wood, or any other suitable substance or
material.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Pritchard in the Great Seal Patent Office on the 25th
February 1879.
EDWARD PRITCHARD, of 27, Great George Street, Westminster, in the County of
Middlesex, Civil Engineer. "CERTAIN IMPROVEMENTS IN JOINTS FOR EARTHEN-
WARE AND CAST-IRON PIPES FOR SANITARY DRAINAGE AND OTHER LIKE PURPOSES."
My improved joint consists substantially in moulding, casting, or otherwise
permanently attaching upon the spigot end of the pipe two or more half threads, the
inside of the socket of the pipe to which it is to be attached being moulded or cast
with corresponding grooves. There is also provided a collar upon the spigot end.
A complete joint is formed by covering the spigot and socket ends of the pipe
with a layer of cement or other equivalent material or substance of a like character,
and screwing the two pipes together. By a slight turn or rotation of the pipes or
either of them on their axes the connection is made.
Instead of moulding, casting, or otherwise permanently attaching the threads
upon the spigot end of the pipe the said pipe may be moulded or cast without any
threads thereon, and instead thereof may be provided with suitable grooves, in
which threads are afterwards placed and secured.
In some cases it may be more desirable to attach the threads to the socket end of
the pipe, but this, as will be understood, is merely a matter of detail.
The threads may be of steel, iron, wood, or any other suitable substance or
material.
That my Invention may be fully understood I have annexed Drawings thereof,
which I now proceed to describe.
Similar letters of reference refer to like parts in the several Figures.
Fig. 1 is an elevation of a pipe shewing my improved joint on the spigot end of
the pipe, and in which A represents the spigot end and B the socket end; C shews
respectively the moulded threads or the grooves in which the loose tongues of iron
or other material are caused to take; F is the collar, which is of the ordinary kind,
and for which no claim is desired to be made.
Fig. 2 is a section of the socket, in which the corresponding grooves are shewn
by the letters D, D.
Fig. 3 shews a section of the complete joint, the parts shewn being similar to
those last described with the addition of the layer of cement, shewn by the solid
black line E, E.
Fig. 4 is a perspective view of a pipe with similar threads C on the spigot end of
the pipe. F is the collar which forms a continuation of the socket B when the
joint is complete.
Having thus described the nature of my said Invention, and the manner in
which the same may be carried into effect, I desire it to be understood that what I
claim as the Invention to be protected by the herein-before in part recited Letters
Patent is, the improved joint for those kinds of pipes mentioned or referred to in
the title, and which consists substantially in providing one end of the pipe with a
thread or threads of the description named, and which may be either loose or be
permanently attached to the pipe by casting or otherwise, the other or reverse end
of the pipe being provided with corresponding grooves into which the said threads
may take, substantially as herein-before described, and as illustrated in the accom-
panying Drawings.
In witness whereof, I, the said Edward Pritchard, have hereunto set my hand
and seal, this Nineteenth day of February, in the year of our Lord 1879.