Improvements in Electric Arc Lamps.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
I, REGINALD HADDAN. of the Firm of Herbert Haddan & Co., of 18, Buckingham
Street, Strand, London, Patent Agent, do hereby declare the nature of this inven-
tion a communication to me from abroad by the Patent Verwerthungs Gesell-
schaft, of 59, Unter den Linden, Berlin, in the Empire of Germany, to be as
follows:-
This invention relates to an improved electric arc lamp and is distinguished
from previous lamps of the kind on account of its simple construction and the
noiseless and automatic working of its mechanism.
The principal feature of this lamp is the circularly bent tubes, which form the
carbon holders, and are provided with set screws by means of which the carbon's
also curved circularly are secured in them.
Each holder is provided with an arm constructed in such a manner as to allow
the holder to oscillate on its centre it being supported on an axle provided for the
purpose and fixed in a fork or carrier. The construction of the holders is such
that the extremities of the carbons are brought together by their own weight.
In order to keep the carbon points at a sufficient distance from each other, for
the purpose of proper illumination, a suitably constructed cross bar is placed above.
the centres of the holders, and provided at each extremity with a roller or spring
acting on the carbon holder, and also with an iron core fixed vertically at its centre.
the core working or sliding in a solenoid in such a manner that on the application
of the current the iron core is drawn upwards into the solenoid and the rollers or
springs at the extremities of the cross bar are brought to bear on the oscillating
carbon holder, so as to bring the carbon points to their proper position.
The lighting power of the lamp can be further adjusted by means of a set screw
provided at the top of the core.
By means of the oscillating holders before described, the carbons as they are
consumed are brought together at their extremities automatically by their own
weight independently of one another and according to the amount of carbon con-
sumed the points being kept always at a proper distance apart by means of the
cross har before described.
Over the light is placed a reflector so as to avoid shadows being cast by any
parts of the lamp.
1
T 1
1005

page_text: Improvements in Electric Arc Lamps.
I, REGINALD HADDAN of the Firm of Herbert Haddan & Co., of 18, Buckingham
Street, Strand, W.C., London, Patent Agent, do hereby declare the nature of this
invention a communication to me from abroad by the Patent Verwerthungs-Gesell-
schaft, of 59, Unter den Linden, Berlin, in the Empire of Germany, and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:
This invention relates to an improved electric arc lamp, which is distinguished
from previous arrangements of this kind, on account of its very simple construction
and the noiseless and regular working of its mechanism.
The principle feature of the lamp is the circularly bent carbon holders, which
are carried on an axle and seated loosely thereon, and the carbons are kept
sufficiently far from one another for the proper working of the lamp, by means of
a cross bar arranged between the holders and over and above the turning point or
axle of the same.
In the annexed drawing:
Figs. 1 to 4 show the carbon holders and carbons in front and side view.
Fig. 5 is a front view of the lamp.
Fig. 6 is a side view of the lamp.
Fig. 7 shows a part of the cross bars.
Fig. 8 shows a different construction of the same.
Fig. 9 is a plan view of Fig. 8.
The curved carbon holders c and care provided with horizontal arms 66' by
means of which they are connected to the axle or axles a and turn easily on the
same. The carbons d and d¹ which are curved to suit the holders are secured in
place by means of the set screws e e¹. Above the turning point of the holders there
is arranged a vertical iron core h passing into a solenoid g, at the under end of
the iron-core there is arranged a cross bar i supported at its centre by the core,
and having two arms k and k¹ which are so formed that their ends, which are pro-
vided with spring rollers or springs (Figs. 8 and 9) operate by means of said
rollers or their springs on the carbon holders c and c¹. The axle a is fixed and
seated in a fork f, and the solenoid g can be arranged either between or over the
same. Instead of the horizontal arms b, b¹ of the carriers vertical arms can be
used as shown in Fig. 1 in dotted lines.
By means of the iron core h and the cross bar i with arms k, k¹ the carbons are,
on the current being formed, automatically brought into the position required for
forming the electric arc. When the lamp is inserted in a circuit of sufficiently
high tension and power, the iron core h with the cross bar arranged thereon, is
raised as it is drawn into the solenoid g, whilst the ends of the cross bar arms
must with their rollers or springs bear against the inner periphery of the carbon
holders, and as the same are arranged on the fixed axle a. but turn easily thereon
their other ends are moved so that the carbon extremities are moved from one
another until the arc is produced. When the carbons become worn the right
distance of the extremities of the same from one another is regulated automatically,
as the iron core h is drawn by the current only for such distance into the solenoid,
until the formation of, the arc is effected, and the iron core must therefore drop
automatically, as the carbon ends tend to move further from one another by being
worn, and it drops exactly and according to the consumption of the carbons, so
that the cross bar sinks also and allows the carbon holders, and consequently the
carbon points, to come together by means of their own weight, thus the distance

page_text: of the carbon points from one another is regulated, and no interruption of the light
takes place.
From the insulated binding post the current traverses the coil g to the arm f,
whence the current passes through the metallic parts of the lamp to the one carbon
holder b, c and carbon across the arc to carbon d holder cb ((insulated at h³) and
from to the insulated binding post h³. The arms kk' must be insulated as
at he he.
In order to allow of an even sliding movement of the cross bar ends on the
carbon-holders, there are arranged rollers in the extremities of the arms kk.
The movement of the iron core in the solenoid 9 and the consequent lighting
effect can also be regulated by a set screw m provided in the solenoid according to
requirements.
Over the light there is fixed a reflector n for diffusing the light.
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 :-
In electric are lamps the carbon holders shaped substantially as described and
pivoted on an axle or axles a the same being automatically adjusted by means of
à cross bar with arms kk and rollers under the action of an iron core operated
by a solenoid g substantially as and for the purpose set forth.
D1
00
L 1000