Year: 1898

page_text: Date of Application, 15th Aug., 1898
Complete Specification Left, 30th Mar., 1899-Accepted, 2nd June, 1899
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
This invention relates to improvements in arc lamps.
The well-known arc-lamps generally comprise two distinct regulating-devices,
one of which is intended to cause the first separation of the carbons, that is to
say the lighting whilst the other is intended to maintain the distance between
the carbons constant.
This class of lamp includes several apparatus which work in a satisfactory
way, but the said lamps are still subject to accidental extinction or to variation
of light-intensity, when the carbons are accidentally brought into contact with
one another, either because of a defective composition of the said carbons, or,
for instance, under the influence of a current of air. In this case there is formed
on the negative carbon an excrescence of graphite, which progressively shortens
the voltaic arc without giving the regulating mechanisms, any possible chance of
again disconnecting the carbons. I am aware that several constructions have
been designed but the same are either very complicated or obstructive.
This invention relates to a regulating mechanism for arc lamps of a very simple
and substantial construction occupying little space and working in both directions.
In carrying my invention into practice the carbons are respectively fixed to
two sliding supports or holders which are connected with one another by means
of cords or the like passing over two lifting pulleys. The upper carbon-holder
is somewhat heavier than the lower one so that, when they are left to themselves,
one carbon will descend and lift the other.
An electromotor is provided the armature of which is not furnished with a
collector and carries at one end of its axis a small pulley to which is connected
one end of a break cord or the like which passes around a large pulley and has
its opposite end connected to a spring fixed to the frame of the apparatus. The
aforesaid large pulley is fixed on the same axis as the small pulleys over which
the cords carrying the carbon holders pass and the break cord acts as a brake
on its pulley when it is wound upon the small pulley by the rotation of the
armature.
Owing to this arrangement the spring attached to the break cord is bent in
proportion and the extention of the said spring is limited by means of a fixed
support.
When the circuit is closed, the armature rotates from right to left actuating
the small pulley which in its turn operates the other pulleys and causes the carbons
to be thereby separated. The current will then be weakened and the armature
will asume an angular position which will depend on the intensity of the current.
077

page_text: Now if by reason of the wear of the carbons the distance between their points
is increased, the current will be weakened and the armature will be gradually
rotated in the inverse direction to that above referred to and the cord or the like
will be unwound from the pulley on the armature thereby releasing the spring and
also the cord from the aforesaid pulley. The carbons are thus progressively
advanced towards one another. When the current is sufficiently weakened the
braking of the pulleys ceases and they are then left to themselves. The current
then again increases, the breakage takes place again as described above and the
distance of the carbons is again regulated.
The electrical connections of the lamp are as follows: From the positive
terminal the current passes through the inductor and armature and from there
to the positive carbon. The negative terminal is directly connected with the
holder of the negative carbon. The derivation coil is branched on the two
carbons it is coiled in inverse sense to the inductor coil, so as to have the ten-
dency of weakening the couple of forces in proportion as the voltaic arc increases.
The movable armature may be of any one of the well-known constructions
used in electro-motors, for instance of the system of Paccinotti; or the double
T form of armature or so-called Siemens-armature, may be used. The said
armature may be formed of a bar without any coil upon it, if the enlargement
of the pole-pieces of the inductor are made of a suitable form. Or the said bar
may be provided with a derivated coil facilitating the working and allowing
several lamps to be placed in series. The movable armature may further be
formed of a coil having no iron core, fixed on a light frame secured to its axis.
In any case and whatever may be the form and construction of the armature,
the same must be constructed so as to have the greatest possible energy in pro-
portion to its mass.
If instead of continuous current, alternate current is used for the production
of the voltaic are, then the magnetic circuit of the electro-motor is divided
in lamels or wires and a resistance without self-induction may be inserted in
the derivated circuit.
Dated this 15th day of August 1898
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
CASI Are Lamps.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,
45, Southampton Buildings, in the County of Middlesex, 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 improvements in arc lamps.
The well-known arc-lamps generally comprise two distinct regulating-devices,
one of which is intended to cause the first separation of the carbons, that is to
say the lighting whilst the other is intended to maintain the distance between
the carbons constant.
This class of lamp includes several apparatus which work in a satisfactory
way but the said lamps are still subject to accidental extinction or to variations
of light-intensity, when the carbons are accidentally brought into contact with
one another, either because of a defective composition of the said carbons, or,

page_text: for instance, under the influence of a current of air. In this case on the
negative carbon an excrescence of graphite is formed which progressively
shortens the voltaic are without giving the regulating mechanisms any possible
chance of again disconnecting the carbons. I am aware that several construc-
tions have been designed but the same are either very complicated or cumber-
some.
This invention relates to a regulating mechanism for are-lamps of a very
simple and strong construction, occupying little room and working in both
directions.
The accompanying drawing illustrates a suitable form of construction for.
carrying out the said invention.
Figure 1 is a front elevation of an arc-lamp in which the axis of the armature
is placed horizontally.
Figure 2 is a side-elevation of the same partly in section.
Figure 3 is a plan view of the same, and
Figure 4 is a diagrammatic view of the electric connections of the construc-
tion shown in Figure 1.
In all the figures, like letters of reference indicate corresponding parts.
In carrying my invention into practice the carbons c and care respectively
fixed to two sliding supports or holders which are connected with one another
by means or cords or the like 2 and 3 which pass over two lifting pulleys g g¹.
The upper carbon-holder c is somewhat heavier than the lower one c¹, so that,
when they are left to themselves, one carbon will descend and lifts the other
causing the pulleys g and g¹ to be partially rotated.
Mm is an electromotor the armature of which is not furnished with a collector
and carries at one end of its axis a pulley f to which is connected one end of
the brake cord or the like d which passes around the pulley b and has its
opposite end connected to a spring a, fixed to the frame of the apparatus. The
aforesaid pulley b is fixed on the axis of the pulleys 9 and g¹ over which the
cord d passes and acts as a brake on the same when wound up by the pulley f
under the action of the armature A.
-
Owing to this arrangement the spring a attached to the brake cord is stretched
in proportion, the extension of the said spring a being limited by means of a
fixed support a¹.
.
When the circuit is closed, the armature rotates in the direction shown by
the arrow in Figure 1, actuating the pulley f which in turn operates the
pulleys gg and causes the carbons to be thereby separated. The current will
then be weakened and the armature will assume an angular position which will
depend on the intensity of the current. Now if by reason of the wear of the carbons
the distance between their points is increased, the current will be weakened and
the armature gradually rotated in the inverse direction to that above referred
to and the cord d is wound upon the pulley f on the armature extending the
spring a to a certain extent, thus braking the pulley f. On the axis of the arma-
ture there is fixed an arm or lever which is intended to limit the stroke of the
armature in the sense inverse to the arrow, by its meeting a bracket ? fixed to
the frame of the device. The carbons are thus progressively advanced towards
one another. When the current is sufficiently weakened the braking of the
pulley 6 ceases and the pulleys g and g¹ are then left to themselves. The current
then again increases, the breakage takes place again as described above and
the distance of the carbons is again regulated.
Figure 4 illustrates the electrical connections of the lamp. From the positive
terminal 1 the current passes through the inductor M and armature A and from
there to the positive carbon c. The negative terminal 2 is directly connected
with the holder of the negative carbon c¹. The derivation coil m is branched
on the two carbons c and c¹; it is coiled in inverse sense to the inductor coil M,
so as to have the tendency of weakening the couple of forces proportionally as
the voltaic arc increases.

page_text: The movable armature may be of any one of the well-known constructions
used in electric-motors, for instance of the system of Paccinotti; or the double T
form of armature or so-called Siemens-armature, may be used. The said arma-
ture may be formed of a bar without any coil upon it, if the enlargements of
the pole-pieces of the inductor are made of a suitable form. Or the said bar
may be provided with a derivation coil facilitating the working and allowing
several lamps to be placed in series. The movable armature may further be
formed of a coil having no iron core, fixed on a light frame on its axis.
In any case and which ever may be the form and construction of the armature,
the same must be constructed so as to have the greatest possible energy in pro-
portion to its mass.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, as communicated
to me by my foreign correspondents, I declare that what I claim is :-
A regulating apparatus for voltaic are-lamps, work-either with continuous
or with alternating currents, characterized by a collectorless electromotor acting
upon the movable carbon-bearers by means of brake pulleys and allowing a
limited separation as well as the approach of the carbons, in combination with
a device for causing the progressive approach of the carbons, controlled by
the variation of the angular position of the armature of the said electro-motor
according to the action of the electric current traversing the same, substantially
as shown and described.
Dated this 30th day of March 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.