Improvements in Conduits for Electric Cables.
Year: 1895

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Date of Application, 17th May, 1895
Complete Specification Left, 14th Jan., 1896-Accepted, 24th Mar., 1896
Improvements in Conduits for Electric Cables.
We, WILLIAM HART, of 23 Surrey Street, Strand, London, Gentleman, and
JAMES SHERREN LUCAS, of South Western Pottery, Parkstone, in the County
of Dorset, Pottery Manager, do hereby declare the nature of this invention to be
as follows: —
This invention relates to conduits formed of earthenware blocks having a number
of parallel longitudinal passages in them to receive the electric cables such blocks
being usually laid in line on sleepers and cemented together to prevent the entrance
of water. In such conduits as heretofore made there has been difficulty in leading out
branch cables for supplying house and other consumers; either part of the conduit
has been taken up, or it has been provided with movable lids or with a sufficient
number of branch pipes or lateral openings to satisfy any possible future demand.
All of these plans have objections.
According to this invention the blocks are made in one piece without lateral
openings but are so formed that the upper part of one or more of the passages
through them can be readily broken away when it is desired to make a connection
without disturbing the remainder of the conduit. For this purpose longitudinal
grooves are formed preferably both outside and inside the wall of the passage to
which access may be required so that the top and preferably also part of one side
of the passage can be broken away with a sharp chisel the line of the break
following the grooves. The part broken away is then replaced by a cover having
a lateral opening or branch pipe through which the connection is led the cover
being secured in place by filling the external grooves with cement. The cover is
so formed that its sides seat themselves on the remaining faces of the original
internal grooves. Generally it is only necessary to make one of the passages of
ilie conduit in this way the other passages being used for mains with which
connections are not required.
The invention is also applicable to a conduit consisting of a single pipe.
1007
:
Improvements in Conduits for Electric Cables.
We, WILLIAM HART, of 23 Surrey Street, Strand, London, Gentleman, and
JAMES SHERREN LUCAS, of South Western Pottery, Parkstone, in the County
of Dorset, Pottery Manager, 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 :-
This invention relates to conduits formed of earthenware blocks having a number
of parallel longitudinal passages in them to receive the electric cables, such blocks
being usually laid in line on sleepers and cemented together to prevent the entrance
In such conduits as heretofore made there has been difficulty in leading out
of water.
LD071

page_text: branch cables for supplying house and other consumers; either part of the conduit
has been taken up, or it has been provided with moveable lids or with a sufficient
number of branch pipes or lateral openings to satisfy any possible future demand.
All of these plans have objections.
According to this invention the blocks are made in one piece without lateral
openings but are so formed that the upper part of one or more of the passages
through them can be readily broken away when it is desired to make a connection
without disturbing the remainder of the conduit. For this purpose longitudinal
grooves are formed both outside and inside the wall of the passage to which
access may be required so that the top and preferably also part of one side of
the passage can be broken away with a sharp chisel the line of the break following
the grooves. The part broken away is then replaced by a cover having a lateral
opening or branch pipe through which the connection is led the cover being secured
in place by filling the external grooves with cement. The cover is so formed that
its sides seat themselves on the remaining faces of the original internal grooves.
Generally it is only necessary to make one of the passages of the conduit in
this way the other passages being used for mains with which connections are not
required.
The invention is also applicable to a conduit consisting of a single pipe.
Figure 1 is a side elevation and Figure 2 a transverse section of a conduit made
according to this invention.
Figure 3 is a transverse section showing a portion broken away and replaced
by a cover.
Figure 4 is a transverse section of a modified form.
a are the walls of the conduit. a' a' grooves in it and b the sleepers on which
it rests.
c (Figure 3) is a cover made in one piece with a lateral branch pipe d.
As shown this cover is formed with a projecting ridge e to rest upon the lower side
of the upper and inner groove a¹. fare the cement joints.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1—
1. Conduits for electric cables formed with both internal and external longitudinal
grooves substantially as described.
2. The combination with conduits such as are referred to in Claim 1 of a cover
so formed that when in place one of its sides will rest upon the side of one of
the internal grooves substantially as described.
3. Conduits for electric cables substantially as described and shown in the
drawings.
Dated this 11th day of January 1896.
WILLIAM HART.
JAMES SHERREN LUCAS.