COUPLINGS FOR METAL-CASED INSULATED ELECTRIC CONDUCTORS
Year: 1884

page_text: Wė JOHN SMITH RAWORTH of Brazenose Street Manchester in the County of
Lancaster Electrical Engineer, and REGINALD ARTHUR SMITH of Plymouth Grove
Manchester in. the County of Lancaster, Electrical Engineer, do hereby declare
the nature, of our Invention for " COUPLINGS FOR METAL-CASED INSULATED
ELECTRIC CONDUCTORS" to be as follows :―
In many cases, especially where insulated electric conductors. have to pass
through. apartments, it is desirable to have them cased over by brass or other
metal tubes.
Our Invention relates to couplings by which separate lengths of these casing
tubes are securely connected, the ends of the 'conductors themselves being at the
same time brought into certain contact so as to ensure maintenance of the circuit.
For connecting two lengths of cased conductor in one line, we screw on to the end
of each tube a thimble having a conical collar, behind which there is a screwed
sleeve like that used for an ordinary pipe union. On front of the thimble is a
filling piece, which may be of wood, containing in a conical recess a piece of
insulating material through which the end of the conducting wire projects. We
coil the projecting end of the wire into a flat convolution the face of which we
scrape bright. We then bring the two wire convolutions together face to face
within an internally screwed socket, into which we screw the two sleeves. These,
bearing against the collars of the thimbles, press the wire convolutions firmly
together, so that they make sound electrical contact, whilst, at the same time, the
two lengths of casing tube are firmly united by the hold which the sleeves upon
them take in the socket.
$
When the conductor. and its casing tube have to be turned a right 'angles, we
employ a socket of elbow form, and in this case the convolutions of the two
conducting wirespinstead of being pressed against each other, are pressed against a
stud of metal held in a block of wood or insulating material in the angle of the
elbow, the one of the wires against the end face of the stud and the other against
the head of a screw which is inserted in the side of the stud, and presents the face
of its head at right angles to the end face of the stud.
In a similar way, when one conductor has to branch into two at right angles to
it and in line with each other, we employ a socket of T-form, having in its middle

page_text: a metal stud which is held in a block of wood or insulating material and has a
screw inserted in its side. The two wire convolutions are pressed against the
opposite faces of the metal stud, and the third is pressed against the head of its.
screw.
ABEL & IMRAY,
Agents for the Applicants,
28, Southampton Buildings,
London, W.C.
We, JOHN SMITH RAWORTH of Brazenose Street Manchester in the County of
Lancaster, Electrical Engineer, and REGINALD ARTHUR SMITH of Plymouth Grove
Manchester in the County of Lancaster, Electrical Engineer do hereby declare the
nature of our Invention for "COUPLINGS FOR METAL-CASED INSULATED ELECTRIC
CONDUCTORS" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
In many cases, especially where insulated electric conductors have to pass
through apartments, it is desirable to have them cased over by brass or other
metal tubes.
Our Invention relates to couplings by which separate lengths of these casing
tubes are securely connected, the ends of the conductors themselves being at the
same time brought into certain contact so as to ensure maintenance of the circuit.
For connecting two lengths of cased conductor in one line we adopt the arrange.
ment shewn in section at Fig. 1 of the accompanying Drawings. We screw on to
the end of each tube A a thimble B having a conical collar, behind which there is
a screwed sleeve like that used for an ordinary pipe union. On front of .each
thimble B.is.a.filling piece D which may be of wood, containing in a.conical recess.
a metal cup E through which the end of the conducting wire projects. We coil
the projecting end of the wire into a flat convolution which is soldered into the
cup E and the face of which we scrape bright. We then, bring the two wire
convolutions together face to face within an internally screwed socket F into
which we screw the two sleeves C. These, bearing against the collars of the
thimbles B press the wire convolutions firmly together, so that they make sound
electrical contact, whilst, at the same time the two lengths of casing tube are
firmly united by the hold which the sleeves C take in the socket F.
When the conductor and its casing tube have to be turned at right angles, we
employ a socket of elbow form, as shewn in Fig. 2, and in this case the convolutions
of the two conducting wires, instead of being pressed against each other are pressed
against a stud of metal G held in a block H of wood or insulating material in the
angle of the elbow, the one of the wires against the end face of the stud G and the
other against the head of a screw K. which is inserted in the side of the stud and
presents the face of its head at right angles to the end face of the stud.
In a similar way, when one conductor has to branch into two at right angles to
it and in line with each other, we employ a socket of T form as shewn in Fig. 3.

page_text: having in its middle a metal stud G which is held in a block H of wood or
insulating material and has a screw K inserted in its side. The two wire
convolutions are pressed. against the opposite faces of the metal stud G and the
third is pressed against the head of its screw K.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. The construction of couplings for metal cased insulated electric conductors
connected in line with each other, substantially as described with reference to
Fig. 1.
2. The modified construction of couplings for an elbow bend, substantially as
described with reference to Fig. 2.
3. The modified construction of couplings for a T junction, substantially as
described with reference to Fig. 3.