IMPROVE. MENTS IN PIPE JOINTS
Year: 1881

page_text: LETTERS PATENT to Enoch George Mawbey, of Market Harborough, in the
County of Leicester, Engineer and Surveyor, for an Invention of "IMPROVE.
MENTS IN PIPE JOINTS."
PROVISIONAL SPECIFICATION left by the said Enoch George Mawbey at
the Office of the Commissioners of Patents on the 11th October 1881.
ENOCH GEORGE MAWBEY, of Market Harborough, in the County of Leicester,
Engineer and Surveyor. "IMPROVEMENTS IN PIPE JOINTS."
The objects of this Invention are to secure a sound watertight joint, and to
dispense with the labor and risk of failure in the present system of making joints
by "caulking," or forcing the jointing materials into a complete socket; to avoid
the displacement of the jointing materials when passing the pipe into its intended
position; also on inspecting a length of pipes laid, to be able to see whether the
joints are made sound without having to take them up, and saving of time in
making the joint.
The Invention consists in covering the whole of the invert of the joint and the
edges of the pipe with a layer or coating of Portland cement or other jointing
material; then bed the pipe by lowering it into the invert, fill up the space
between the flanges with Portland cement, and place a fillet of Portland cement
around the edge of the lower half of the socket.
In wet or unstable ground to make the joint more secure I insert an iron pin
through the sockets to be fastened with a wedge shaped cotter. The jointing
materials intended to be used are either Portland cement, Roman cement, a thick
liquid of sulphur and sand, a thick liquid of pitch, coal-tar, and lime or asphalte,
tarred hempen, spine, gaskin, or tarred felt cut into the shape of bands or washers.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Enoch George Mawbey in the Great Seal Patent Office on the
11th April 1882.
ENOCH GEORGE MAWBEY, of Market-Harborough, in the County of Leicester,
Engineer and Surveyor. "IMPROVEMENTS IN PIPE-JOINTS."
The objects of this Invention are to secure a sound water-tight joint, and to
dispense with the labour and risk of failure in the present system of making joints
by "caulking," or forcing the jointing materials into a complete socket; to avoid
the displacement of the jointing materials, when passing the pipe into its intended
position; also on inspecting a length of pipes laid, to be able to see whether the
joints are made sound without having to take them up, and saving of time in
making the joint.
The Invention consists of a new method of forming joints in pipes, by which
pipes can be laid by lowering one pipe vertically into another directly into its
intended position in work, instead of pushing the end of one pipe into the other,
and by bedding it solidly into the jointing material previously placed around the
invert of the socket. There is a half band made round the upper half of the spigot
end of the pipe, corresponding with the upper portion of the socket end, which
together form a dove-tail shaped groove, which groove is to be filled solid with
the jointing material. Two small studs are made on the invert of the socket
to keep the pipes in true line.
For laying the pipe I cover the whole of the invert of the joint and the edges of
the pipe with a layer or coating of Portland-cement or other jointing material, then
lay the pipe by lowering it into the invert, fill up the space between the flanges
with Portland-cement, and place a fillet of Portland-cement around the edge of the
lower half of the socket.
In wet or unstable ground to make the joint more secure I insert an iron
The
pin through the sockets to be fastened with a wedge shaped cotter.
jointing materials intended to be used may be Portland-cement, Roman-cement, a
thick liquid of sulphur and sand, a thick liquid of pitch, coal-tar, and lime
asphalte, tarred hempen spun gaskin, or tarred felt cut into the shape of bands or
washers.
The Drawings hereunto annexed will serve more fully to explain my Invention.
Figure 1 being plan of top of pipe.
Figure 2, section of pipe showing one joint made.
Figure 3, side elevation of pipe showing one joint in position, and the manner of
lowering a pipe into position.
Figure 4, side elevation showing the same joint with an iron pin inserted at H
secured with wedge-shaped cotter, and dove-tailed at I to be used in wet
unstable ground.
or
The Invention is performed by covering the whole of the invert of the joint and
the edges of the pipe at A, A, A, and B, B, Figures 1 and 2, with a layer or coating
of Portland-cement or other jointing material; then bedding the pipe C, C, Figures 1
and 3, by lowering it into the invert A, A, in the manner shown at C, Figure 3.
Fill up the space D, D, Figures 1 and 3, with Portland or other cement, as shown
at E, Figure 2, and place a fillet of Portland-cement around the edge of the lower
half of the socket, as shown at F, Figure 2, and by dotted lines at G, Figure 3 ;
S, S, are the studs for keeping the pipes in true line.

page_text: The Invention is applicable to pipes made of earthenware, clay, stoneware,
fireclay, iron, or other metal, Portland-cement-concrete, or other material or
composition.
In witness whereof, I, the said Enoch George Mawbey, have hereunto set
my hand and seal, this Eleventh day of April, A.D. 1882.