Improvements in Conduits for Laying Electrical Cables.
Year: 1899

page_text: Improvements in Conduits for Laying Electrical Cables.
We, WILLIAM HENRY NICHOLS, of 30, Heavitree Road, Plumstead Common, in
the County of Kent, Clerk, and W. T. HENLEY'S TELEGRAPH WORKS COMPANY
LIMITED, of 27, Martin's Lane, Cannon Street, in the City of London, do hereby
declare the nature of this invention to be as follows:-
This invention relates to the earthenware conduits in which underground electric
cables are laid and has for its object to enable the cradles on which the various
lengths are at present supported to be dispensed with and afford the conduit
throughout its length a firm flat bearing on the concrete bed on which it is
laid.
According to this invention the lengths of rectangular or other tubing which
go to form the conduit are secured to one another by spigot and socket joints
similar to those of ordinary earthenware drain pipes, closed with cement as usual,
but each socket extends around three sides only of the conduit, the fourth side
which constitutes the bottom of the conduit having no flange, so that the ends
of adjacent lengths butt joint along their lower sides, whereat the joint between
the contacting ends is securely closed by the concrete bed on which the conduit
is laid. For this purpose the concrete bed is finished off flush on top and is made
of a depth or thickness sufficient to afford a firm continuous bearing for the
conduit, independent of local subsidences of the ground.
This construction enables the cradles, which are necessary to support the
lengths of conduit when jointed together by the usual all-round socket and spigot
joints as at present made, to be dispensed with, and ensures a firm flat bearing
for the conduit throughout its length, without risk of strain being thrown on
the joints in consequence of local disturbance of the ground.
Dated this 9th day of August 1899.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
COMPLETE SITIFICATION.
Improvements in Conduits for Laying Electrical Cables.
We, WILLIAM HENRY NICHOLS, of 30, Heavitree Road, Plumstead Common, in
the County of Kent Clerk and W. T. HENLEY'S TELEGRAPH WORKS COMPANY,
LIMITED, of 27, Martin's Lane, Cannon Street, in the City of London, do hereby
declare the nature of this invention and in what manner the same is to be per-
[Price Så L

page_text: formed to be particularly described and ascertained in and by the following
statement:-
This invention relates to the earthenware conduits through which underground
electric cables are to be drawn, and has for its object to ensure a continuous flat
bearing for the conduit on the concrete bed and to dispense with the use of
cradles for supporting each section of the conduit at intermediate points of its
length.
According to this invention the spigot and socket joints by which the lengths
of conduit are connected, instead of being all round as usual, are so formed that
the socket of each joint extends around the top and sides only of the conduit,
there being no projecting fillet or flange at the bottom side so that the bottom
of the conduit is perfectly flat throughout the ends of adjacent lengths merely
making a butt joint at the bottom side of the conduit, the function of the socket
flange, to ensure a close joint, being effectually fulfilled at this point by the flat
surface of the concrete bed on which the conduit is laid.
The invention is illustrated in the accompanying drawings wherein Figure 1
is a cross section on line 1, 1 Figure.2 and Figure 2 a longitudinal section of a
conduit joint.
The lengths of earthenware piping are made of the usual rectangular form in
cross section and multitubular or moulded with horizontal and vertical longi-
tudinal divisions to form separate conduits through which as many electric mains
may be drawn. Upon one end of each length is formed a socket A adapted to
receive the spigot end B of the adjacent length, a tight joint being made by
cement as at C in the usual way of closing such joints. The socket 'A of each
joint extends however only across the top and down the sides of the joint, there
being no socket at bottom, where the underside of the one length merely butts
against the underside a of the other length.
The concrete bed D on which the conduit is laid is made of a depth or thick-
ness sufficient to afford a firm support for the conduit, independent of local sub-
sidences of the ground, and it is finished off smooth and level on its top surface
so as to afford a continuous bearing for the flat bottom of the conduit through-
out its length, without risk of strain being thrown on the joints in consequence
of local disturbance of the ground.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
The herein described mode of jointing earthenware conduits for electric cables
which consists in forming a spigot and socket joint at the sides and top only
and a flush butt joint at the bottom side of the conduit, the conduit being con-
tinuously supported directly on a flat finished bed of concrete substantially as
specified.
1.
0
1000
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.