Improvements in Suspension Fittings for Electric Lighting Systems, adapted to High Voltage.
Year: 1899

page_text: Date of Application, 6th Oct., 1899-Accepted, 2nd Dec., 1899
COMPLETE SPECIFICATION.
Improvements in Suspension Fittings for Electric Lighting Systems,
adapted to High Voltage.
We, MAX RAILING, Electrical Engineer, and JoHN HILLERY COLLINGS, Designer,
both of No. 88, Queen Victoria Street, in the City and County of London, 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 follow-
ing statement:-
-
Our invention relates to certain improvements in suspension fittings for elec-
tric lighting systems, especially applicable to the ball multiple socket with two
or more branches depending therefrom. The object of our said invention is to
provide sufficient insulation to sustain the conditions of high voltage or potential
without risk of short circuiting or leakage to any appreciable extent.
In order that our said invention may be clearly understood, we have appended
the accompanying sheet of drawings, in which Figure 1 is a view of the fitting
in perspective, and Figure 2 a plan view of the base of the upper part Ä
Figure 1. Figure 3 is a corresponding plan view of the upper surface and con-
tacts of the lower part B. Figure 4 is a section of the upper part A with the
cover shown by a dotted outline, and Figure 5 is a similar view of the lower
part B. Figure 6 is a plan view of a multiple connection upon B adapted to a
three wire or like system.
In carrying our invention into effect we employ a ball or oval shaped metal
shell consisting of two parts, A and B, the upper part A screwing into the
lower part B. Said upper part A carries a china or porcelain base C into which
is embedded two terminal plates TT, with spring plunger contacts. To
further preserve the insulation a wall of insulating material m is fixed to, or forms
an integral part of the base C and effectually protects the two terminals
above the spring plunger, and abuts against the corresponding insulating base C
when the two parts are screwed together. The lower part B, from which the
branch circuits are derived is fitted with a similar porcelain, china or like insulat-
ing base C into which is sunk an annular contact piece e corresponding to the
spring plunger contact 1, and a central sunk pin d corresponding to the spring
plunger contact t. The external casing B may form one part of the electrical
circuit, and the branch leads being carried through the tubes connected to the
nozzles a establish a number of connections to lamps or the like according to the
design. But in cases of high voltage or potential we do not prefer to use the
exterior casing A and B as a part of the circuit, and therefore employ double
insulated wires or leads. In the case of adapting our invention to three way
or multiple system, we may split the outer ring or annular contacte at e, and
use three or more plunger contacts t. The connections are made upon e by the
screws and to d by the screws r.
We do not confine ourselves to any particular substance or material of which
to make the insulating partitions, walls, or bases, but may adapt these to various
conditions of usage.

page_text: 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: -
First. In a suspension fitting for electric lighting systems, the method of and
means for insulating the terminals or contacts of different signs and potential
substantially as herein described and shown by the appended drawings.
Second. In suspension fittings for electric lighting systems of high voltage
the method of and means for sinking the terminal plates into the base, and
interposing an insulating wall m between the projecting portions, substantially
as herein described and shown by the appended drawings.
Third. In suspension fittings for electric lighting systems of high voltage, the
method of and means for sinking the annular and central contact into the insu-
lating base substantially as herein described and shown by the drawings.
Fourth. In suspension fittings for electric lighting systems of high voltage, the
splitting of the sunk annular contact and the provision of corresponding plunger
contacts to conform to the requirements of a multiple circuit, substantially as
herein described, with reference to Figure 6 of the appended drawings,
i.
This 5th day of October 1800
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant.