Improvements in Electric Arc-lamps.
Year: 1892

page_text: Date of Application, 1st Apr., 1892
Complete Specification Left. 31st Jan.. 1893-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by HENRI WILBRANT, of 13, Boulevard de la Senne,
Brussels, in the Kingdom of Belgium, Electrical Engineer.]
Improvements in Electric Arc-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 to be as follows:-
This invention relates to an electric arc lamp.
In this improved arc lamp the armature is pierced at its centre with a suitable
hole for the passage of the carbon holder, and is adapted to oscillate upon a hinge
or the like between the electro-magnet and a stop. A spring presses it at the
same time against the carbon holder which consequently cannot fall and which, by
reason of its weight, participates in the movement of the armature during the
downward oscillation, but remains in its place during the upward oscillation. The
oscillating movement of the armature is effected by the action of a spring the
tension of which may be regulated by a screw and an automatic interruptor.
Dated this 1et den of Anvil 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electric Aro-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:-
My invention relates to electric arc lamps.
The improved arc lamp is provided with an electro-magnet and an armature
which latter acts directly upon the carbon holder without any intermediate
mechanism for the purpose of gradually feeding the carbon as
consumed.
the latter is
The lamp comprises a lighting mechanism and a regulating mechanism, both of
the electromagnetic kind.
In the accompanying drawing I have shown a central vertical section of an arc
lamp constructed according to my invention.
The regulating mechanism comprises an armature A of a tubular electro-
magnet B the core of which is provided with a hole through its axis serving to
guide the upper carbon holder C.
The wire wound upon the bobbin of this electromagnet is in derivation upon the
conductor which unites the two carbons of the lamp to the terminals of the source
of electricity.
The armature A is in the form of a disc, and is likewise formed at its centre
with a hole corresponding to that in the electromagnet and through which the upper
carbon holder C also passes.
A spring D acts upon the armature A so as to draw the rod C towards the left
in order to wedge the said rod and hold it in a state of rest, in the hole in the
armature which serves as a guide.
A spring E acts upon the armature for moving it upward after it has been
attracted by the electromagnet.

page_text: The tension of this spring is regulated by means of a screw E¹ for permitting
the attraction of the armature A when the wear of the carbons necessitates the
approach of the latter.
To the upper surface of the armature is fixed, by means of a small insulating
block, a strip A which makes contact with a stop F; this strip and the stop are
both included in the derived circuit of the electromagnet, in such a manner that
any break of contact between this strip and the stop produces an interruption in
the current which eventually traverses this circuit..
The lighting mechanism comprises a tubular electromagnet G through the centre
of which passes the lower carbon holder H. This holder is fixed directly, as
shown, to the armature G' of the said electromagnet.
The conductor which surrounds the lighting electromagnet is arranged in series
in the circuit which connects the carbons of the lamp with the terminals of the
source of electricity.
The improved arc lamp is operated in the following manner :
If the carbons of the lamp are not in contact the whole current passes through
the electromagnet B and the armature A is attracted. In this movement the
armature carries with it the upper carbon holder C and causes it to descend
through a distance equal to the space between the armature and the cores of the
electromagnet.
At the same time the contact is broken at F and the armature is moved upwards
under the action of the spring E. This upward movement however does not raise
the rod C as the weight of the latter is opposed to this upward movement taking
place.
A fresh downward movement of the armature, corresponding to a fresh descent
of the rod, takes place and so on until the moment when the two carbons come
in contact.
At this moment the whole current passes through these carbons and also
through the electromagnet G arranged at the lower part of the lamp and the
armature of which, as it descends, separates the carbons and forms the arc.
It will be understood that it is not necessary that the electromagnet be of
tubular form, nor for the armature to be in the form of a disc. Any armature may
be used, provided it is formed with an aperture through which passes the .carbon
holder and in which this rod can be wedged as above set forth.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1.
The employment, for the purpose of regulating the approach of the carbons in
electric arc lamps, of an armature of an electromagnet, which operates the upper
carbon-holder direct, substantially as hereinbefore described.
Dated this 31st day of January 1802
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.