Improvements in the Formation of Junctions for Electric Mains.
Year: 1892

page_text: Date of Application, 3rd Sept., 1892
Complete Specification Left, 20th Oct., 1892-Accepted, 26th Nov., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Formation of Junctions for Electric Mains.
I ARTHUR MOORE THOMPSON of Crewe in the County of Chester, Mechanical
Engineer, do hereby declare the nature of this invention to be as follows:-
In carrying out an installation of the electric light it is necessary at certain
points to form a junction or joint between the main cable and a branch or auxiliary
cable, or it may be between the main or the branch cable, and the wire leading
to one or more incandescent lamps, and these joints or junctions are usually formed
by removing the insulation covering from the cables and soldering the wires
together restoring the insulation covering when the joint is so formed: Should it
be necessary say to provide for a number of single lamps placed in parallel across
the main cables this method of jointing becomes a slow and expensive process,
now the object of my invention is to provide an inexpensive and expeditious
means of forming such junctions and I accomplish it by means of a clip or ring
which may be most conveniently formed of brass. or other metal, and of such a
size and form as to encircle or partially encircle the main cable over its insulation
covering, through this clip or ring a hole is drilled and tapped for the reception
of a screw with a pointed end, and after this ring or clip is placed on the main
cable the screw is screwed into the hole and through the insulation of the cable
until the point comes in contact with the metal core of the cable, thus estab-
lishing an electrical contact between the metal core and the screw, and at the
same time securing the clip or ring on the cable. The wire leading to the lamp
is now attached to the screw of the clip on say the negative cable then to the
lamp and then to the screw of a similar clip or ring attached to the positive
cable thus completing the electrical circuit through the lamp.
Dated this 2nd dor of Santember 1899
A: MOORE' THOMPSON.
COMPLETE SPECIFICATION.
Improvements in the Formation of Junctions for Electric Mains.
I ARTHUR MOORE THOMPSON of Crewe in the County of Chester, Mechanical
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 :-
In carrying out an installation of the electric light it is necessary at certain
points to form a junction or joint between the main cable and a branch or auxiliary
cable, or it may be between the main or the branch cable and the wire leading
to one or more incandescent lamps, and these joints or junctions are usually formed
by removing the insulation covering from the cables and soldering the wires
together restoring the insulation covering when the joint is so formed. Should
it be necessary say to provide for a number of single lamps placed in parallel
across the main cables this method of jointing becomes a slow and expensive
process, now the object of my invention is to provide an inexpensive and
expeditious means of forming such junctions and I accomplish it by means of a
clip or ring which may be most conveniently formed of brass or other metal and
of such a size and form as to encircle or partially encircle the main cable over
its insulation covering, through this clip or ring a hole is drilled and tapped
for the reception of a screw with a pointed end, and after this ring or clip is
placed on the main cable the screw is screwed into the hole and through the

page_text: insulation of the cable until the. point comes in contact with the metal core of
the cable, thus establishing an electrical contact between the metal core and the
screw and at the same time securing the clip or ring on the cable; the wire
leading to the lamp is now attached to the screw of the clip or ring ou say
the negative cable then to the lamp and then to the screw of a similar clip or
ring attached to the positive cable thus completing the electrical circuit through
the lamp.
To make my invention more clearly understood I now refer to the accompanying
drawing,
Figure 1 Sheet 1 shows a section of an electric light cable with one form of
clip in position.
A is the copper core of the cable, B is insulated coating, C is the clip, D is
a screw with pointed end which pierces the insulation covering and makes contact
with the copper core A. E is a fixed collar on the screw D, F is a nut, G is
the auxiliary wire leading to one or more incandescent lamps and it is secured
to the screw D by means of the nut F.
Figure 2 Sheet 1 is a plan of the same form of clip.
Figure 3 shows a modification the clip being in the form of a ring.
Figure 4 shows a further modification.
In this case I make electrical connection
with the metal core of the cable by means of two narrow brass strips H, J,
provided with points K, L, which are forced through the insulation covering of
the cable. Over these brass strips I provide a clip in two halves M. N, which
may be formed of vulcanite or other non conducting material, the two halves
being secured by small bolts and nuts at O and P, the auxiliary cable is secured
in position by the bolt P.
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. The formation of junctions between insulated electric main cables or wires,
and auxiliary cables or wires, by means of clips, substantially as described and
illustrated by the drawing.
Dated this 19th day of October 1892.
A. MOORE THOMPSON.