Improvements in Electric Arc Lamps.
Year: 1894

page_text: Date of Application, 21st Dec., 1894
Complete Specification Left, 23rd Sept., 1895-4ccepted, 9th Nov., 1895
Improvements in Electric Arc Lamps.
We ALEXANDER BEWICKE BLACKBURN of Bushbury Works Wolverhampton
in the County of Stafford Civil Engineer and GEORGE WILLIAM FAIRALL of
34 Ann Street Tettenhall Road Wolverhampton aforesaid Electrician do hereby
declare the nature of the said invention to be as follows.-
The principal object of this invention is to provide electric arc lamps in which
there is better regulation, less length of case, and gienter ease of manipulation than
in are clectic lamps as hitherto constructed
According to this invention the clutch or brake mechanism by which the feeding
of the carbons is regulated consists of a band or strap which wraps round the
friction wheel the said band carrying a curved elastic strip pivotted at its centie to
the strap and furnished at each of its ends with a friction block or shoe which
piess against the wheel so that it becomes sensitive to the minutest vanations in
the tension of the band or strap. The solenoids which control the lamp are placed
below the level of the plate which divides the mechanism from the portion
containing the carbons thereby reducing the total length of the lamp, division
pieces protecting the solenoids from the fumes and dust given off by the eat bons
We provide an attachment for supporting the globe when it is lowered for
trimming the lamp consisting of two rods connected at one end to the base of
the globe the other sliding telescopically in the two frame rods which guide the
carbon holders and which are made hollow for the purpose. The carbon holder is
formed somewhat like a drill-chuck of split pieces held together by a spring and
having a spherical base so that on forcing the carbon into the socket it is firmly
held and a universal movement within limits enn be given to it so as to ceutic it
properly in relation to the other carbon.
Dated this 21st day of December 1894.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Electric Are Lamps.
We, ALEXANDER BEWICKE BLACKBURN of Bushbury Works, Wolverhampton
in the County of Stafford, Civil Engineer and GEORGE WILLIAM FAIRALL of
34 Ann Street, Tettenhall Road, Wolverhampton aforesaid, Electrician do hereby
declare the nature of this invention and in what manner the same is to be
performed to be particularly descubed and ascertained in and by the following
statement
-
The principal object of this invention is to provide clectic arc lamps in which
there is better regulation, less length of case, and greater ease of manipulation, than
In arc electric lamps as hitherto constructed.
We will describe this invention with reference to the accompanying drawings
wherein
Figue 1 is an elevation of part of an electric arc lamp constructed in accordance
with our invention.

page_text: Figure 2 shews the lamp partly in section.
Figure 3 shews the brake arrangement separately.
Figure 4 shews the attachment for supporting the globe when lowered and
Figure 5 shews the upper carbou holder.
"
According to this invention tlie 'clutch, or brake, mechanism by which the feeding
of the carbons 18 regulated consists of a band, or strap, A wluch wraps round the
friction wheel a, the said band, or strap, A, carrying a curved elastic strip C,
pivotted at its centre B to the band, or strap, A, and furnished; at each of its ends,
with a fiction block, or shoe, c, each of which passes through an opening in the
band, or stiap, A and presses against the wheel a. so that it becomes sensitive to
the minutest variations in the tension of the band, or strap, A The solenoids S,
which control the lamp, are placed below the level of the plate p, which divides
the mechanism from the portion containing the carbons, thereby reducing the
total length of the lamp, division pieces D protecting the solenoids from the
fumes and dust given off by the carbons. We provide an attachment for
supporting the globe when it is lowered for timming the lamp, or other purpose,
the said attachment consisting of two rods F, F, connected together at the
bottom by a cross piece f, which is secured to the base of the globe, which may be
done by the screw and nut E, or by any other suitable means, the other ends of
the said rods FF sliding, telescopically in the two frame rods, G, G, which guide
the carbon holders, and which are made hollow for the purpose. The upper carbon
holder is formed somewhat like a dull-chuck, of split pieces H, I, forced towards
each other, by a spring I bearing on a plate J, acting on the spherical surface of
the holder, the whole being contained in a casing K, so that on forcing the carbon
juto the socket it is firmly held and a universal movement, with limits, can
be given to it, so as to centre it properly in relation to the other carbon
parts shewn in the drawings which we have not described constitute no part of our
invention, and may be of any usual, or suitable, construction.
The
Having now particularly descubed and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is.
1. In, or foi, electric arc lamps, the combination with the brake strap of spring
beaung pieces to bear upon the friction wheel, substantially as, and for the purpose,
hereinbefore described.
2. In electric arc lamps, the arrangement of the solenoids below the plate which
divides the mechanism from the carbons, substantially as, and for the purpose,
herembefore described
3. In electic atc lamps, a globe supporter provided with 1ods sliding in, or ou,
the frame-iods of the lamp, substantially as herein before described.
4 In, on for, electric arc lamps, a carbon holder consisting of spherical gripping
pieces atauged for gripping the carbon, and allowing of movement, substantially
as, and for the purpose, hereinbefore described.
5. In electric aic lamps, the combination of parts substantially as, and for the
purposes, herembefore described.
Dated this 21st day of September 1895
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents for the Applicants.