An Improved Electric Arc Lamp.
Year: 1897

page_text: Date of Application, 15th Nov., 1897-Accepted, 29th Jan.,
1898
An Improved Electric Arc Lamp.
We, RICHARD WILHELM LUDWIG HOLSTEN and the ELEKTRISCHE BOGEN-
LAMPENFABRIK NAECK & HOLSTEN GESELLSCHAFT MIT BESCHRANKTER HAFTUNG,
both of Stralsund, in the Empire of Germany, Engineer and Manufacturers
respectively, 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:--
This invention relates to an electric arc lamp in which the formation of the
arc both as regards its regulation and the adjustment of the carbons is effected
by two separate iron cores but which penetrate from different sides into a single
solenoid.
The object of the invention is shown in the accompanying drawing,
A chain carrying the carbon holders v and w runs over a chain wheel n and
a guide pulley o. The chain wheel serves for driving a clockwork with a
train 2. On the last arbor of the clockwork a flyer h is arranged. The
upper carbon holder which is loaded with a weight tends to draw the chain
in the direction indicated by the arrow and thus drives the clockwork in a
corresponding direction as long as the flyer is not arrested.
The roller o is arranged on a one armed lever & which is pivotally mounted
on a pin s on a plate of the clockwork mounted on the lamp plate t. About⚫
the centre of the lever dan elbow arm m is mounted. It therefore moves with
the lever, and the lever & also carries in proximity to the roller o a movably mounted
iron core c. The lever together with the arm m, roller o and iron core c is
according to requirements exposed to the pull of a spring p.
.
The iron core centers from below into a solenoid a carried by columns from
the lamp plate t. Another iron core b enters the same solenoid from above and
hangs flexibly on a longer arm of a two armed lever e pivotally mounted on a
pin . The lever e is carried by an extension of the upper coil flange and is
held up by a spring u. The short end of this lever carries a small elbow lever f
pivoted on a pin k. This elbow lever has at its other end a pawl g tapered to
a sharp edge. So long as it is not prevented said lever f hangs by its excess
of weight towards the side of the pawl and rests on a projection of the lever e.
The two levers d and e are so adjusted by means of their respective springs that
the pawl
arrests the flyer h. so long as both cores b and c are not attracted or
drawn in by the solenoid a.. The lamp is shown in this currentless condition.
Its mode of operation is as follows:
-
On being switched on, the two iron cores b and c are drawn into the solenoid a
in consequence of the strong excitation of the latter. In consequence of the
drawing in of the lever d is raised, the arm m releases by pressing sideways
the pawl g from the lower lever arm of the lever f so that the flyer h of the
clockwork is released and the carbons move slowly together. As soon as they
are in contact whereby the excitement of the solenoid a is reduced, e descends
with the lever d, the roller o and the lower carbon, so that the arc light is
formed. The arm m moves away at once from the elbow lever f and the clock-

page_text: work is arrested by the pawl g and the flyer h. The lever d then holds the arc
light always in its correct position according as the working pressure rises or
falls, or by reason of inequalities in the carbons it moves the carbons apart or
approaches them one to the other.
Independently of it and exactly corresponding to the consumption, the other
iron core b, by means of lever e and pawl g, effects a permanent adjustment of
the carbons. The use of two cores operated by a single solenoid affords consider-
able advantages. The attraction of the lower core c into the solenoid takes
place very strongly on the lamp being switched on, whilst the removal of the
carbons from one another during the formation of the are light takes place
gradually as both cores b and c mutually attract one another. By the use of a
separate light releasing lever for the adjustment of the carbons, the releasing of
the clockwork and thus the adjustment of the carbons is made independent of
the friction of the carbon holders in and on the tubes as well as of the weight
of the carbons.
The are lamp hereinbefore described is provided with divided iron cores and
intended for alternating current. It may however with very slight alterations
be also applicable for constant current. For this object the solenoid need only
be provided with an iron core to form an electro magnet and the aforesaid cores b
and c be replaced by armatures adapted to be attracted by 'said electro-magnet.
The connections of the solenoid and carbons are as follows:-
The solenoid a is in shunt to the are light. One end of the coil is connected
to a terminal y insulated from the lamp frame and the other end to a terminal z
which is in electrical connection with the lamp frame.
The lower carbon is in electric connection by means of a flexible wire z¹ with
the lamp frame, that is with the terminal . The upper carbon is insulated from
the bar by means of a thin mica plate ¹ and connected with the terminal y
by means of a flexible wire y¹.
The main current passes thus from the terminal y through the upper carbon
into the lower one and from thence through the lamp frame to the terminal z.
The solenoid is in shunt with the two terminals.
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:-
An electric arc lamp with two iron cores each mounted on a lever, which cores
enter a common solenoid from two ends and one of which levers produces the
pushing together of the carbons and the formation of the are light when switched
on, and the other the adjustment of the carbons whilst burning, with the object
of obtaining a powerful drawing of the cores into the solenoid in consequence
of their mutual attraction and a slow return of the same and the releasing of
the clockwork by one of the iron cores by means of a separate lever independently
of frictional resistances of the carbon holders and of the weight of the carbons,
substantially as herein before described.
Dated thin 12th dow of Nawombo 1807
WM. P. THOMPSON & Co.,
Of G, Lord Street, Liverpool, Patent Agents for the Applicants.