An Improvement in Jointing Boxes for Coupling Up and Insulating Electric Wires.
Year: 1898

page_text: Date of Application, 6th Aug., 1898
'Complete Specification Left, 6th May, 1899-Accepted, 29th July, 1899
PROVISIONAL SPECIFICATION.
An Improvement in Jointing Boxes for Coupling Up and Insulating
Electric Wires.
THOMAS MCEWAN, Electrical Engineer, 36, Dick Place, Grange, Edinburgh,
do hereby declare the nature of this invention to be as follows:-
The following is a description of the experimental box. It is a metal box of a
circular form having holes tapped round the box at various points into which pipes
are screwed and through which the wires or cables pass into the box.
The wire or cable is then pared back leaving only the pure rubber as insulation
inside the box.
The wires or cables are then connected to a metal contact piece or pieces. This
contact piece or pieces are then placed inside an india rubber bag and the bag securely
fastened round the neck on to and over the india rubber insulating the wire. If
more than one contact piece is used separate bag encloses each contact piece.
The contact piece or pieces with the wires attached inside the rubber bag are then
placed inside the metal box.
This metal box is then made watertight by means of a metal cover which is screwed
on to the box and having an india rubber washer inserted between the box and the
cover.
An Improvement in Jointing Boxes for Coupling Up and Insulating
Electric Wires.
I, THOMAS MCEWAN, Electrical Engineer, of "Hazelwood," 36, Dick Place, Grange,
Edinburgh, 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 an improvement in jointing boxes for coupling and in-
sulating electric wires.
Referring to the accompanying drawings in which Fig. 1 illustrates a cross section
of my improved jointing box I employ a cast iron or other metal box A of a circular
form having holes tapped round at various points into which pipes B are screwed and
through which the wires or cables C pass into the box.
The tape of the wires is then pared back allowing only the pure rubber to be left
as insulation for the wires or cables.

page_text: The wires or cables are connected to a metal contact piece D and all enclosed
inside an indiarubber bag E which is tied tightly round the neck on to and over the
indiarubber which insulates the wires or cables. If more than one contact piece is
used, a separate bag encloses each; or if desired two bags one over the other may be
employed with each contact piece.
The contact piece or pieces with the wires or cables attached inside the rubber bag
are then placed inside the box A which is made watertight by an iron cover F
screwed down to the box and having an indiarubber washer inserted between it and
the box.
Fig. 2 shews the contact piece, with wires attached, removed from the box and
the rubber bag as it appears before being tied over the contact piece.
I have shewn the bag as of a .circular forn but I do not limit myself to that
particular shape as it may be varied such as by forming it of any convenient shape
with a constricted neck similar to that of a bottle, which neck is expanded to allow
the contact piece to be inserted. Or in place of employing a permanently shaped
bag as shewn, the bag may be formed from a flat circular or other shaped sheet of
rubber folded over and tied in position.
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 :-
The improvements in jointing boxes for coupling up and insulating electric wires,
consisting in attaching the ends of several wires to one or more contact pieces and
enclosing the same within a bag of indiarubber firmly tied on to and over the
insulating rubber of the wires, substantially in the manner as hereinbefore described
and shewn in the accompanying drawings.
Dated this 5th day of May 1899.
JOHNSONS,
Applicant's Agents, 115, St. Vincent Street, Glasgow.