Improved Electric Arc Lamp.
Year: 1898

page_text: Improved Electric Arc Lamp.
I, JOSEPH THIEBAUT TSCHIERET, Electrical Engineer, of 22, Rue Danton, in
Levallois-Perret, Seine, France, do hereby declare the nature of this invention to
be as follows:-
The present invention consists of a simple, strong and steady arc lamp, which
shall be capable of operating both with an alternate current and with a continuous
current and high tension currents, without undergoing any further modification than
the mere substitution of a coil.
The accompanying drawing is a diagram showing an arc lamp according to my
invention.
a, bare two plates or disks connected by standards c and serving as a support
for the entire mechanism of the lamp.
e is the upper carbon-holder sliding with but slight friction upon the guide f
fastened to the plate a, the said holder being, furthermore, guided by a sleeve g
rising from the top face of the plate b.
i is the lower carbou-holder connected to the upper holder e by means of a cord,
chain or band passing around pulleys k,l. The lower holder is guided by a
sleeve m projecting downwardly from the plate 6 and suitably insulated from the
said holder.
n is a solenoid or electro-magnet on a shunt from the internal circuit of the lamp,
o and p being the terminals which are respectively connected to the carbon-
holders e and i.
The movable core 9 of the solenoid n is jointed to one end of a piece r which
constitutes the lighting and regulating device proper. The said piece is formed, at
its free end, into a socket which slides with but very little friction upon the rod
of the holder e. At a suitable intermediate point of the piece, preferably nearer
its connection with the core q than the socket r³, is attached the lower end of a
coiled spring 8, the other end of which is connected to an adjusting screw t by
which the tension of the spring s may be regulated as required. A stop screw u
engaging a lug von the sleeve g regulates the length of the arc when lighting.
The operation is as follows: The lamp being at rest and the carbons apart, if the
current be turned on, the solenoid n will attract the core q and the latter will cause
the piece to move downward, the socket 1 carrying with it by friction the holder e
whereby the two carbons will approach each other. On the carbons touching, the
intensity of the current passing through the solenoid n will be decreased to an
extent that the attraction exerted by the said solenoid upon
the core 4
too weak to oppose the action of the spring 8; the latter will then raise the piece r
will become
and by causing the socket r¹ to slightly bind upon or grip the holder e, the latter
will be raised, whereupon the carbons separate and the lamp lights.
When, on the carbons consuming, the are lengthens, the intensity of the current
passing through the solenoid n increases and the solenoid attracts its core 9 more
powerfully, whereby the piece will be caused to descend gradually together with
he holder e. When the piece strikes the top of the sleeve g, it cannot move down
Din 31
r

page_text: any further; but as the solenoid n still attracts the core q, the piece will be
released from its gripping or binding action upon the holder e and the latter will
move down until the length of the arc again becomes normal; the intensity of the
current passing through the solenoid n will then again become too weak to oppose
the action of the springs, which acting upwardly upon the piece r, will cause the
socket to bind upon or grip the rod of the holder e and stop the latter in its
downward movement.
.
I
Improved Electric Arc Lamp.
I, JOSEPH THIEBAUT TSCHIERET, Electrical Engineer, of 22, Rue Danton, in
Levallois-Perret, Seine, France, 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 present invention consists of a simple, strong and steady arc lamp, which
shall be capable of operating both with an alternate current and with a continuous
current and high tension currents, without undergoing any further modification
than the mere substitution of a coil.
The drawing accompanying my Provisional Specification is a diagram showing an
arc lamp according to my invention.
a, b are two plates or discs connected by standards cand serving as a support for
the entire mechanism of the lamp.
e is the upper carbon-holder sliding with but slight friction upon the guide ƒ
fastened to the plate a, the said holder being furthermore guided by a sleeve y
rising from the top face of the plate b.
i is the lower carbon-holder connected to the upper holder e by means of a cord,
chain or band passing round pullies kl. The lower holder i is guided by a
sleeve m projecting downwardly from the plate b and suitably insulated from the
said holder.
n is a solenoid or electro-magnet on a shunt from the internal circuit of the
lamp, o and p being the terminals which are respectively connected to the carbon-
holders e and i.
The movable core 9 of the solenoid is jointed to one end of a piece which
constitutes the lighting and regulating device proper. The said piece r is formed,
at its free end, into a socket which slides with but very little friction upon the
rod of the holder e. At a suitable intermediate point of the piece r, preferably
nearer its connection with the core q than the socket 1, is attached the lower end
of a coiled spring s, the other end of which is connected to an adjusting screw t by
which the tension of the springs may be regulated as required. A stop screw u
engaging a lug on the sleeve g regulates the length of the are when lighting.
The operation is as follows: The lamp being at rest and the carbons apart, if the
current be turned on, the solenoid n will attract the core q and the latter will cause
the piece to move downward, the socket 1 carrying with it by friction the
holder e whereby the two carbons will approach each other. On the carbons
touching, the intensity of the current passing through the solenoid n will be
decreased to an extent that the attraction exerted by the said solenoid upon the
core q will become too weak to oppose the action of the spring s; the latter will then

page_text: lights.
e,
raise the piece and by causing the socket to slightly bind upon or grip the
holder the latter will be raised, whereupon the carbons separate and the lamp
When, on the carbons consuming, the arc lengthens, the intensity of the current
passing through the solenoid increases and the solenoid attracts its core q more
powerfully, whereby the piece will be caused to descend gradually together with
the holder e. When the piece r strikes the top of the sleeve g, it cannot move down
any further; but as the solenoid n still attracts the core q, the piece will be
released from its gripping or binding action upon the holder e and the latter will
nove down until the length of the arc again becomes normal; the intensity of the
current passing through the solenoid n will then again become too weak to oppose
the action of the spring s, which, acting upwardly upon the piece ", will cause the
socket to bind upon or grip the rod of the holder e and stop the latter in its
downward movement.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In an electric arc lamp, the combination, with the two carbon-holders
connected by a flexible medium, of a solenoid on a shunt from the terminals of the
lamp; a soft iron core movable in the said solenoid; a lighting and regulating piece
jointed at one end to the said core and embracing, by its other end, the rod of the
upper carbon-holder upon which it slides with very little friction, and an adjustable
spring acting in opposition to the force of the solenoid which tends to move the
carbons towards each other, the said spring causing the lamp to be lighted and
regulated by the mere gripping or binding of the said piece upon the upper carbon-
holder, substantially as described and shown.
2. An electric arc lamp comprising, in combination, two carbon-holders connected
by a flexible medium and a piece subjected, at one end, to the attraction of a
solenoid on a shunt which tends to cause the carbons to approach each other, whilst
its other end slides with but very little friction upon the rod of the upper carbon-
holder upon which it is made grip or bind by means of an adjustable spring, acting
upon the said piece in opposition to the force of the solenoid, substantially as
described and shown.
ט .LL.
CT
1000