Improvements in Electric Arc Lamps.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in Electric Arc Lamps.
I, JAMES BROCKIE, of 65, Lowth Road, Camberwell, in the County of Surrey,
Electrical Engineer, 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 :-
My invention relates to a simple, strong and compact construction of the frame-
work for electric arc lamps, offering facilities for the use of double or multiple
carbons and for the general manipulation of the lamp, all the working parts of
which are protected.
Fig. 1 of the accompanying drawings is an elevation partly in section of frame-
work according to my invention for a lamp adapted for two sets of carbons. Fig. 1
shews a modification of the guide for the upper carbon.
Fig. 2 is a plan of the upper part, the top cover being supposed to be removed.
Fig. 3 is a plan of the bottom frame which carries the glass globe.
In constructing the framing, a top cover A, a middle guide plate B and a base
plate C are held firmly together by a central tube, or it might be a rod, D. The
regulating mechanism (which forms no part of my present invention, and is omitted
from the drawings in order to avoid confusion) is accommodated in the space
between A and B and is protected by a cylindrical casing E which is fixed to the
cover A.
The space between B and C is also enclosed within a casing F which can be slid
up telescopically within E when access is required to the parts within F.
From the base C two tubes G G extend down to carry a double rimmed cross-
head H, and within the tubes G slide rods I which have enlarged heads and have
their lower ends fixed to the globe carrier J. A central pin K has through it a
cross key which holds J up to H but which, in turning the pin one quarter round,
can pass down through the elongated hole of H, and thus the globe can be lowered
until the heads of the rods I come to rest on shoulders within the eyes of the cross-
head H.
The upper carbon is held in a socket at the end of a rod L, which is at its top
fixed to a tube R that can slide along a rod M. This tube R may have a rack on
it for the regulating apparatus to gear into, or in the case of a clutch lamp, it is
the part upon which the clutch acts for regulation.
The rod L and tube R are protected from products of combustion of the carbons
by an outer enclosing tube N which is jointed tightly to both the plates B
and C.
The rod L carrying the upper carbon, instead of being guided as above described,
may be guided along the fixed rod M as shewn in Fig. 1. The lower carbon is
held in a socket at the end of a rod P which slides through the plates B and C.
At the tops of each of the rods L and P project brackets to which is attached a
cord passing over a pulley Q mounted on the cover A.
Instead of one pulley with a cord attached to the two rods carrying respec-
tively the upper and lower carbons, there may be a pair of pullies insulated from
each other, as shewn by Fig. 4, each having attached to its periphery the one
end of a flexible metallic cord or band, the other end of which is attached to
one of the rods carrying the carbons. These metallic cords or bands, or the
pullies, may be electrically connected to the terminals of the lamp by suitable
rubbers, or, as shewn in Fig. 4 by flexible metallic bands or cords S¹ S² attached
to the pullies near their axes.
Instead of connecting the plates A B and C together by a central tube or
rod D, they might be connected at their peripheries by cylindrical castings
having ample openings through their sides to give access to the parts within."

page_text: Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The framing of an electrical arc lamp consisting of the plates A B and C
and the crosshead H secured together and provided with guides and pullies for the
carbon holders, substantially as described.
2. The combination of the rod L carrying the upper carbon, the tube R
attached to it and sliding on the rod M, and the protecting tube N, substantially as
described.
3. In combination with the crosshead H and the tubes G the globe holder J with
its headed rods I and the central pin K with cross key, substantially as and for the
purpose set forth.
4. In combination with the rods carrying the upper and lower carbons, flexible
metallic cords or bands attached thereto and to separate insulated pullies, each
electrically connected with one of the lamp terminals, substantially as described.
Dated this 25th day of March 1891.
זרח
ABEL & IMRAY,
Agents for the Applicant.