Improvements in the Construction of the Joints of Drain and other Pipes.
Year: 1891

page_text: Date of Application, 28th Oct., 1891
Complete Specification Left. 28th July, 1892-Accepted, 24th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Construction of the Joints of Drain and
other Pipes.
FREDERICK CHARLES LYNDE 25 Cross Street, Manchester Civil & Sanitary
Engineer do hereby declare the nature of this invention to be as follows:--
My invention consists in so forming the interior surface of the socket that a
taper or bell shaped form is produced. The object of making the socket bell
shaped being to enable the cement or jointing material to be easily forced in
between the spigot and the socket and thus consolidate the luting. The spigot
end may, upon its outside surface, be formed also taper or bell shaped and may
have projections formed upon it to maintain it in a concentric position with the
Bocket. Both the interior surface of the socket and exterior surface of the spigot
may be serrated in helical or parallel rings or ridges so as to hold the jointing
material firmly in position.
Dated this 27th day of October 1891.
FREDERICK CHARLES LYNDE.
COMPLETE SPECIFICATION.
Improvements in the Construction of the Joints of Drain and
other Pipes.
I, FREDERICK CHARLES LYNDE 25 Cross Street Manchester Civil and
Sanitary 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 :—
My invention consists in so forming the interior surface of the socket that a
taper or bell-shaped form, being wider at the circumference than at the root is
produced with the object of enabling the jointing material to be easily forced in
between the spigot and the socket and thus permitting the luting to be consolidated.
The interior of the socket or exterior of the spigot or both may be serrated in
helical or parallel rings or ridges or may be made without such serrations or rings
or ridges. A projection or projections which I call a centring block or blocks are
formed or provided for the purpose of maintaining one pipe in a concentric position
with that into which it fits and thus a true invert is produced. It is evident that
the centring block or blocks may be formed within the socket and thus a similar
result would be produced.
Hitherto the socket of drain pipes have usually been made parallel, or nearly 80,
but according to my invention, I make the sockets very much wider at the mouth
than at the root or of a taper or bell mouthed form.
My invention will be readily understood by reference to the accompanying
drawings and the following description thereof:-
Figures 1, 2 & 3 shew one particular form of bell mouth socket, having ridges
or steps within it, and having two centring blocks, C & D, Figure being an
enlarged cross section through one of the centring blocks C or D, (on line A C
or A D Figure 3), Figs. 2 and 3 being longitudinal and transverse sections through
a complete joint.
Fig. 4 illustrates a modified form of the bell-shaped socket, having ridges or
steps which are of undercut shape, and the centring blocks C & D.
Fig. 5 illustrates the socket of taper form with the number of ridges or steps
Price 8d.1

page_text: increased, and of either parallel form, as shewn by the full lines or backed off as
shewn by the dotted lines, and with the centring block or blocks.
Fig. 6 illustrates the bell shaped socket with the ridges or steps undercut and
backed off and with the centring block or blocks.
Fig. 7 illustrates the bell shaped socket having ridges or steps backed off but not
undercut and with the centring block or blocks.
Fig. 8 illustrates a socket having one centring block.
Fig. 9 illustrates a spigot end of a pipe having one centring block.
Fig. 10 illustrates a spigot end of a pipe having two centring blocks.
At the point B is shewn a method of fixing a detached centring block by dove-
tailing it into the spigot, in a similar manner the centring block can be dovetailed
in to the socket.
I do not limit the number of rings or ridges within the socket, or upon the spigot,
nor do I confine myself to the number of centring blocks.
Figs. 11, 12 & 15 illustrate sockets of bell shaped and taper form without any
ridges rings or steps but with centring block or blocks C. D.'
Fig. 13 illustrates a modified bell shaped form of socket with centring block or
blocks.
Fig. 14 illustrates the spigot end of a pipe W being in position within a socket
and supported in a concentric position by the centring blocks C & D.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A socket of a pipe of taper or bell shaped form, or wider at the opening than
at the root, the inner surface of which is formed with ridges rings or steps substan-
tially as explained in the foregoing déscription and annexed drawings.
2. A pipe having the socket. made of taper or bell shaped form, or wider at the
opening than at the root, the inner surface of which is formed with ridges, rings or
steps having a centring block or blocks either upon the spigot end or within
the socket substantially as explained in the foregoing description and annexed
drawings.
3. A socket of a pipe of taper or bell shaped form or wider at the opening than
at the root, with or without serrations, ridges, rings or steps in combination with
centring block or blocks substantially as explained in the foregoing description and
the annexed drawings.
4. A pipe having a socket of taper or bell shaped form, or wider at the opening
than at the root, provided with a centring block or blocks, either upon the spigot
end of the pipe or both upon the spigot and within the socket, substantially as
explained in the foregoing description and the annexed drawings.
Dated this 27th day of July 1892.
FREDERICK CHARLES LYNDE.