Improvements in Earthenware Pipes and Connections or Fittings therefor.
Year: 1891

page_text: Date of Application, 23rd Dec., 1891-Accepted, 30th Jan., 1892
Improvements in Earthenware Pipes and Connections or Fittings
therefor.
I, HENRY GREENING of 3 Pembury Grove, Lower Clapton in the County of
London, Builder, 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 :—
The object of this invention is to provide a secure joint for earthenware pipes,
traps, bends, tees, and the like; more especially sanitary drain pipes and connec-
tions thereof.
In laying drain pipes, it is important that the conuections or joints should be
durable and permanent without being complicated in construction and that when
such pipes are laid, the liability to breakage of the joints should be reduced to a
minimum or entirely eliminated.
Now according to my invention, I construct each pipe with a screw thread around
the exterior of the spigot end thereof, to correspond and engage with a screw thread
around the interior of the socket of the adjacent pipe. The screwed portion may
be single or double threaded and one or more turns of the screw may be employed,
or two half threads springing from opposite points in the circumference of the pipes,
in the case of a double threaded screw.
In order that my invention may be clearly understood, I will now proceed to
describe the same with reference to the accompanying drawings, in which
Fig. 1 is elevation of drain pipe constructed according to my invention.
Fig. 2 plan of socket end of pipe.
Fig. 3 plan of spigot end of pipe.
Fig. 4 longitudinal section of pipes showing the joint complete.
Fig. 5 longitudinal section of pipe with two half threads formed thereon in place
of the single thread shown in Figs. 1 to 4.
Similar letters of reference indicate corresponding parts in all the figures.
Upon the spigot end of pipe A is a screw thread (or threads) B, and in the
socket of the pipe is a screw thread (or threads) C, to admit the screw thread
or threads B, upon the spigot end of the next pipe (A Fig. 4). When the
spigot end of pipe A' is inserted into the socket of pipe A, and screwed up
tight, it presses firmly against the washer D, and cement E may be used to
make the joint perfectly secure.
In case the pipes are made with more than one screw thread, or with two
half threads, as shown in Fig. 5, the action of securing same in place is precisely
similar.
The thread is preferably of the shape shown in the figure, and the female thread
made somewhat larger than the male thread to allow the cement E to be used,
which when the pipes are screwed up.is forced all round the spigot and thread B,
to ensure a water and gas tight joint.
Having now particularly described and ascertained the nature of my said
invention, and in what manner same is to be performed, I declare that what I
claim is
(I.) In earthenware pipes and connections, the screw thread or threads formed
upon the spigot and socket ends of the pipes, substantially as hereinbefore described
1

page_text: (II.) The improved earthenware pipes and fittings, substantially
and shown.
Dated 23rd December 1891.
as described
ERNEST
SALAMAN,
61 & 62, Chancery Lane, London, W.C., Agent for Applicant.