Improvements in Electric Light Fittings.
Year: 1894

page_text: Date of Application, 4th Dec., 1894
Complete Specification Left, 4th Sept., 1895-Accepted, 5th Oct., 1895
PROVISIONAL SPECIFICATION.
Improvements in Electric Light Fittings.
I, JAMES MCFARLANE, Manager of Munro's Electrical Manufacturing Company
Limited of 9 Holland Place in the County of the City of Glasgow North Britain
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a safe and reliable counterweight arrange-
ment for the convenient raising and lowering of electric light fittings. In carrying
my invention into practice I propose to use in combination with the well known
counterweight or spring roller as applied to ordinary gasaliers an electrically insulated
metal conductor wound into the form of a spiral spring, which when pulled out a limited
distance and released, will go back into its former position by reason of the spring
in itself, or it might be aided in this to some extent by the addition of a spiral or
other spring either of spring wire or elastic band placed in line with the insulated
metal conductors, or the conductors themselves might consist of a spring steel wire
coated with copper to a sufficient thickness to enable the electrical current to pass
through the copper in preference to the steel wire. These said conductors with or
without the additional spring, as the case may be, are enclosed in two tubes, one
telescoping into the other, the internal surface of which tubes may be coated with
a fire-proof and electrically insulating composition.
This arrangement does away with the danger incurred when heavy fittings are
hung on wires or cables which also transmit the electric current, and the trouble
and expense inseparable from the use of a spring drum with rubbing contacts for
coiling up the wire. The ends of the conductors terminate in a suitable form of
electric insulator with terminals to connect wires to body of the fitting and flexible
connections at roof.
Dated this 3rd day of December 1894.
BOTTOMLEY & LIDDLE,
154 St. Vincent Street, Glasgow, Applicant's Agents.
COMPLETE SPECIFICATION.
Improvements in Electric Light Fittings.
1, JAMES MCFARLANE, Manager of Munro's Electrical Manufacturing Company
Limited, of 9 Holland Place, in the County of the City of Glasgow, North Britain,
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. :-
The object of this invention is to provide a safe and reliable counterweight
arrangement for the convenient raising and lowering of electric light fittings.
My invention is illustrated on the drawing hereunto annexed.
In carrying my invention into practice I propose to use in combination with the
well-known counterweight or spring roller as applied to ordinary gasaliers an
electrically insulated metal conductor or conductors A A' wound into the form of a
spiral spring B B' which, when pulled out a limited distance and released, will go
back into its former position by reason of the spring in itself, or it might be aided
A

page_text: in this to some extent by the addition of a spiral or other spring either of spring
sire or elastic band C shown passing through the centre of the gasalier and place
in line with the said insulated metal conductors A A', or the conductors themselves
might consist of a spring steel wire coated with copper to a sufficient thickness
to enable the electrical current to pass through the copper in preference to the
steel wire. These said conductors A A¹, with or without the additional spring, as
the case may be, are enclosed in two tubes D, D', the inner tube D being preferably
bell-mouthed E at its lower end, and one tube telescoping into the other, the
internal surface of which tubes may be coated with a fire-proof and electrically
insulating composition.
This arrangement does away with the danger incurred when heavy fittings are
hung on wires or cables which also transinit the electric current, and the trouble
and expense inseparable from the use of a spring drum with rubbing contacts for
coiling up the wire. The ends of the conductors terminate in a suitable form of
electric insulator with terminals to connect wires to body of the fitting and flexible
connections at roof.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
In electric light fittings, in combination with the well-known counterweight or
spring roller as applied to ordinary gasaliers, the use of an electrically insulated
metal conductor or conductors wound into the form of a spiral spring, substantially'
as and for the purposes herein before described and illustrated on the accompanying
drawing.
Dated this 3rd day of September 1895.
BOTTOMLEY & LIDDLE,
154 St. Vincent Street, Glasgow, Applicant's Agents.