Improvements in or relating to Joints and Attachments for Con- centric Armoured Electric Conductors, and the Methods of Making the same.
Year: 1892

page_text: Date of Application, 6th Jan., 1892
Complete Specification Left, 5th Nov., 1892-Accepted, 4th Feb., 1893
PROVISIONAL: SPECIFICATION.
Improvements in or relating to Joints and Attachments for Con-
centric Armoured Electric Conductors, and the Methods of Making
the same.
I JOSEPH DEVONPORT FINNEY ANDREWS, of 41 Parliament Street in the
County of London, Engineer do hereby declare the nature of this invention to be
as follows:-
My invention relates to the jointing of lengths or branches of concentric armoured
electric conductors together, the method of attaching the same to their fixing
supports in such way that the cable is firmly gripped without in any way damaging
it and the means employed in such construction.
For the purpose of making a joint connecting two lengths of concentric or
armoured cable I first bind and solder a wire round the outer conductor or armouring
at suitable points so that its ends shall remain in position and from such point of
binding cut away the outer conductor and taper down the insulating material
until the inner conductor is exposed, join to this the inner conductor of the
second length or branch as the case may be, which has been prepared in an
exactly similar manner. I then wrap this joint with insulating material which
may be prepared for vulcanisation and over this I put a sheath of thin sheet
copper overlapping the ends of the outer conductor I now apply to the joint a
mould of the required shape and depth and pour in a metal fusible at a low
temperature making the metallic joint complete and at the same time vulcanising
the insulating material.
The moulds I employ are made in one piece either of metal or (preferably) of
some non heat conducting material such as fire clay or asbestos, one face or side
of such mould being open. In the case of and when making vertical joints I
temporarily cover this open side with a plate pouring the jointing metal in through
a suitably placed gate. When such joints have to bear the strain of drawing in, or
the weight of the cable in overhead mains I cast round the outer conductor a piece
or collar of metal, at each end of and a little beyond the joint and to these pieces
or collars I attach one or more rods or short lengths of wire rope bridging and
taking the strain off the joint. I adopt a somewhat similar method for attaching
such cables to the carrying poles the piece or collar being preferably made to rest
in a recess of a bracket, which thus carries the cable.
Dated this 6th day of January 1892.
J. D. F. ANDREWS.
COMPLETE SPECIFICATION.
Improvements in or relating to Joints and Attachments for Con-
centric Armoured Electric Conductors, and the Methods of Making
the same.
I, JOSEPH DEVONPORT FINNEY ANDREWS of 41 Parliament Street
London S.W. 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 relates to the jointing of lengths or branches of concentric
armoured electric conductors together, the method of attaching the same to their
fixing supports in such way that the cable is firmly gripped without being in any
way damaged, and the means employed in such construction.

page_text: For the purpose of making a joint connecting two lengths of concentric or
armoured cable I first bind and solder a wire round the outer conductor or armouring
at suitable points so that its ends shall remain in position, and from such points of
binding cut away the outer conductor or armouring and proceed substantially as
described in my previous Patent No. 11,041 of A.D 1890.
The mould I employ is made in one piece, either of metal, or (preferably) of
some non heat conducting material such as fireclay, asbestos, wood or paper, one
side of such a mould being open.
In the case of & when making vertical joints I temporarily cover this open
side with a plate, pouring the jointing metal in through a suitable git.
Fig. 1 of the accompanying drawings, is a plan of such a mould, and of a
cable and branch lying in position therein; a, al is the cable, b is the branch,
c the body of the mould, and d the recess therein to receive the molten metal.
Fig. 2 is an end elevation of the same the line e f being the base of the mould,
and usually in a horizontal position when in use; when it is to be used in a
vertical position a plate is placed against the open side of the mould.
When such joints have to bear the strain of drawing in, or the weight of the
cable in overhead mains, I cast round the outer conductor or armouring a piece or
collar of metal at each end of and a little beyond the joint, and to these pieces or
collars I attach one or more straight rods or short lengths of wire rope, thus
bridging the joint and taking the strain off the joint itself."
Fig. 3 is an elevation of such a joint:
:-
g being the collar; 1, the rods or ropes and a, a' the cable.
I adopt a somewhat similar method of attaching such cables to the carrying
poles, the piece or collar being preferably made to rest in a recess of a P bracket
which thus carries the cable.
Figs. 4 and 6 are elevations of such attachments and brackets for the support of
armoured or concentric cables.
Figs. 5 and 7 are end elevations of the same.
Having now particularly described & ascertained the nature of my said inven-
tion and in what manner the same is to be performned, I declare that what I
claim is
1. Improvements in making joints between lengths of armoured or concentric
electric conductors and moulds therefor, substantially as described.
2. The strengthening of joints in electric conductors substantially as described.
3. The attachment of wires to their supports substantially as described.
Dated this 5th day of November 1892.
J. D. F. ANDREWS.