An Improved Arc Lamp.
Year: 1894

page_text: Date of Application, 27th Jan., 1894
Complete Specification Left, 4th May, 1894-Accepted, 9th June, 1894
PROVISIONAL SPECIFICATION.
An Improved Arc Lamp.
1, FRANK TAYLOR, of Westbourne, Bolton, Lancashire, Electrician, do hereby
declare the nature of this invention to be as follows:-
My invention relates to arc lamps and has for its object to improve the
construction of arc lamps as hereinafter indicated.
My improved lamp is preferably of the description known as "inverted," that is
to say, the positive carbon when a direct current is passed through the lamp, is
below the negative carbon and the mechanism is in the lower portion of the
lamp.
According to one method of carrying out my said invention I fix the lower carbon
to the frame, the upper carbon being fed towards the said lower carbon to maintain
the are of the proper length. The motive power which causes the feeding is
supplied by the weight of the upper carbon and holder and the regulation of the
feed is controlled by an electro-magnet included in a shunt on the arc, through the
medium of a wheel-train. The arc is struck through the lifting of the upper
carbon by an electro-magnet in series with the arc and I sometimes arrange that
the feeding of the upper carbon shall be controlled by an electro-maguet included
in a shunt on the arc acting in conjunction with the striking electro-magnet which
is in series with the arc.
In order that the nature of my invention may be more clearly understood I will
proceed to describe briefly one form of arc lamp constructed in accordance
therewith.
The upper carbon-holder is adapted to slide up and down in suitable guides and
is attached by a flexible chain or the like passing over a pulley at or near the top
part of the famp, to a "floating" pulley which is connected through a weak spiral
spring to a shaft which forms the axis of said pulley. Said shaft is provided with
a pinion which gives motion to a series of wheels supported in a frame which is
pivoted on a bracket secured to the framework of the lamp. The frame supporting
the wheel train is connected to a pivoted lever and the series and shunt electro-
magnets are arranged so as to act on suitable armatures at the ends of the said
lever. The last wheel of the train is preferably formed with rounded projections
on its periphery; a detent of suitable form is provided which engages with said
rounded projections and prevents the rotation of the wheel and the feeding of the
carbon when the frame is in its normal position and the arc is the right length.
When the arc grows long the shunt electro-magnet grows more powerful and
attracts its end of the lever, this pulls the frame and wheel away from the detent
so that the upper carbon can drop slightly rotating the wheels of the train through
the medium of the flexible chain or the like which is attached to the floating
pulley. When no current is flowing through the lamp the carbons are in contact
and as soon as current is turned on the series coil acts to pull the frame of the
wheel train in such a manner as to cause the upper carbon to strike the arc.
I may obviously use a shunt electro-magnet for regulating the rotation of the
wheel train independently of the series electro-magnet if desired.
I sometimes arrange that the lamp shall be partly self-focussing by making
the lower carbon-holder capable of sliding up and down and connecting it to
the upper carbon-holder by an inextensible flexible cord in a
understood.
manner well
The spiral spring which connects the floating pulley to its shaft is exceedingly
weak and its only function is to maintain taut the cord which joins the upper

page_text: carbon-holder to the said pulley. This is more especially useful while the lamp is
being trimmed and fresh carbons inserted.
My improved arc lamp is well adapted for use in lighting rooms by diffused light
from the ceiling. The mechanism is by my improved arrangement contained in a
very small space.
Although I have hereinabove described various methods of carrying out my
invention I may nevertheless make alterations in detail without departing from the
nature thereof.
1
2
1007
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
An Improved Arc Lamp.
I, FRANK TAYLOR, of Westbourne, Bolton, Lancashire, Electrician, 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 arc lamps and has for its object to improve the
construction of arc lamps as hereinafter indicated.
My improved lamp is preferably of the description known as "inverted," that is
to say, the positive carbon when a direct current is passed through the lamp, is
below the negative carbon and the mechanism is in the lower portion of the lamp.
In order that my invention may be clearly understood 1 will proceed to describe
the same with reference to the accompanying drawings, in which
Figure 1 is a front view, and
Figure is a side view of an arc lamp constructed in accordance with my
invention.
Like letters denote similar parts in both the drawings.
A is the frame of the lamp which is provided with two uprights A', A' forming
guides for the carbon holders, B, B¹. Cis an electromagnet the coil of which is in
scries with the arc and D is another electromagnet the coil of which is in a shunt
on the arc. Said electromagnets are provided with iron cores C' and D'
respectively which are linked to a lever E pivoted at E¹ to a bracket A² secured
to the frame. Said lever E is connected by a link E² to the frame F which carries
the wheel train.
•
The upper carbon holder B is connected by a chain G which passes over guide
pulleys G1, G2 to the lower carbon holder B' so that when the lower carbon holder
is lowered the upper carbon holder is raised.
The frame F is pivoted at F' to a bracket A³ secured to the frame and carries
the wheel train the last wheel H of which forms a brake wheel. Said brake wheel
when the frame F is lifted by the link E' comes in contact with a spring supported
lever I and so prevents the wheels of the train from rotating. The first wheel H¹
of the train is connected through pawl and ratchet mechanism H2 with a floating
pulley or drum H3 which is connected through a spring H with a pin H' secured
to the frame F. Said pulley or drum is also connected by a flexible tape or the
like J to the lower carbon holder B¹.
K, K are the terminals of the lamp, the current enters by the insulated
terminal K and passes by the insulated wire K2 to the series coil C the other end
of which is electrically connected with the framework of the lamp. The current
therefore passes from coil C through the framework to the lower carbon-holder B¹
through the carbons L, L' and by the insulated wire K³ to the other insulated
terminal K of the lamp. One end of coil D is also connected to the frame of the
lamp hence the current after leaving the series coil can pass through the shunt

page_text: coil D and by insulated wire K to the insulated terminal K' without passing
through the arc, the coil D is therefore a shunt to the arc.
The upper carbon holder is weighted with weights B', B' and so keeps the
carbons in contact as long as no current is passing through the lamp. When
current is turned on to the lamp the series coil C is energized and attracts its
core C¹ and through the medium of the lever E lifts the link E2, this link raises
the end of the frame F and brings the brake wheel H against its detent I and so
locks the wheel train and at the same time the other end of the frame F and the
pulley H³ is depressed which pulls down the lower carbon through the medium of
the tape J and strikes the arc. The distance by which carbons are separated is
regulated by the adjustable screw F' which comes in contact with the base
of the lamp and prevents the frame F rotating more than a certain amount.
The tape J is in tension and tends to rotate the pulley H³ which pulley is however
prevented from rotating owing to the ratchet H² which connects said pulley to
wheel H', the wheel Hat this time being locked by the brake wheel.
When the arc grows long more current passes round the shunt coil D which
attracts its core D' and through lever E' and frame F lowers the brake wheel H.
The wheel train is thereby unlocked and the wheel H¹ can rotate thus allowing
pulley H to rotate under the influence of the weights B2, B3 pulling at the tape J.
The carbons are thus brought nearer together.
In the lamp shewn in the drawings, the feeding is controlled by both magnets C
and D acting differentially upon the lever E but I sometimes arrange that the
controlling lever shall be acted upon by a shunt electromagnet alone, the series
electromagnet being used to strike the arc.
The brake wheel H is shewn with rounded projections on its periphery but it
will be understood that I may use a brake wheel of any suitable form.
The spring
detent I may be mounted in various ways.
When the lamp is not required to be self-focussing I fix the lower carbon holder
to the frame of the lamp, the chain G and the pulleys G1, G2 being dispensed with.
The tape J is then connected direct to the upper carbon-holder.
The spiral spring which connects the floating pulley to its shaft is exceedingly
weak and its only function is to maintain taut the tape or cord which joins the
upper carbon-holder to the said pulley. This is more especially useful while the
lamp is being trimmed and fresh carbons inserted.
My improved arc lamp is well adapted for use in lighting rooms by diffused
light from the ceiling. The mechanism, is by my improved arrangement contained
in a very small space.
Although I have hereinabove described various methods of carrying out my
invention I may nevertheless make alterations in detail without departing from
the nature thereof.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
An arc lamp constructed and operating substantially as described with reference
Dated this 2nd day of May 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.