Improvements in and relating to the Carbon Feeding Mechanism of Electric Arc Lamps.
Year: 1899

page_text: Date of Application, 6th July, 1899
Complete Specification Left, 6th Apr., 1900-Accepted, 16th June, 1900
PROVISIONAL SPECIFICATION.
Improvements in and relating to the Carbon Feeding Mechanism of
Electric Arc Lamps.
We, VERITYS LIMITED, Electrical Engineers, and WILLIAM REGINALD RIDINGS,
Electrical Engineer, both of Plume Works, Aston, in the County of Warwick,
do hereby declare the nature of this invention to be as follows:-
Electric arc lamps to which this invention relates are of the kind in which
the carbons and their holders are indirectly suspended from a brake wheel,
around the circumference of which a chain or band is wound and tightened
or loosened to grip and slip the said brake wheel so that its operation shall
feed the carbons and control the striking of the arc.
According to this invention the weight of one of the carbons and its holder
is utilized for keeping taut the one end of the brake-wheel band or chain,
whilst the other end of the said band or chain is held fast by the shifting core
of the series solenoid, the slight loosening of the said band or chain around
the brake wheel being effected, at the desired time, by that end of the band
or chain controlled by the weight of the carbon being momentarily loosened
through a moving part attached to it coming against a fixed stop.
In carrying the invention into effect, one of the carbons, preferably the
positive, is sufficiently weighted to rotate the brake wheel for the carbon's feed,
but its suspension cord first taken over a small roller or pulley connected
to one end of a first order lever whose other end has attached to it the one
end of the brake wheel band or chain, the said suspension cord afterwards
passing around a small pulley on the brake wheel's axis and proceeding there-
from in a suitable manner to the carrier of the negative carbon, so that on
the rotation of the brake wheel the carbons are either advanced towards each
other or separated according to the direction of the said rotation.
The lever as aforesaid is jointed onto the head plate of the lamp's frame,
and that end of it to which the brake-wheel band or chain is attached carries
a screw pin, which at certain times viz.:-Jn slipping the brake wheel for
the carbons feed, comes against a stop formed on the said head plate, the
said screw pin enabling the amount of movement of the lever's end, to come
against the stop, being adjusted.
The brake-wheel band or chain after passing round the periphery of the
brake wheel has its other end connected to a horizontal rocking beam or a
jointed yoke coupling the cores of the series and shunt solenoids, the connection
of the said band or chain being upon the series arm of the beam.
When the carbons are burning properly the one end of the band or chain
is held taut by the series solenoid against the weight of the carbon and holder
whose suspension cord passes over the small pulley on the lever, the position
of the said lever then being with its screw pin end free of the stop.
To feed the carbons, by slackening the band or chain upon the brake wheel;
the effect of the weighted carbon must be momentarily taken from acting

page_text: upon the end of the band or chain attached to the lever, and this is done by
the end of the said lever, after a time, coming against the stop before described
on the head plate.
Ta.lo 1900
W. P. THOMPSON & Co.,
11, Burlington Chambers, New Street, Birmingham,
Patent Agents for the Applicants.
Improvements in and relating to the Carbon Feeding Mechanism of
Electric Arc Lamps.
We, VERITYS LIMITED, Electrical Engineers, and WILLIAM REGINALD RIDINGS;
Electrical Engineer, of Plume Works, Aston, in the County of Warwick, do
liereby 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:
Electric arc lamps to which this invention relates are of the kind in which
the carbone and their holders are indirectly suspended from a brake wheel,
around the circumference of which a chain or band is wound' and tightened
or loosened to "grip" and "slip" the said brake wheel so that its operation
shall feed the carbons and control the striking of the arc.
According to this invention the weight of one of the carbons and its holder
is utilized for keeping laut the one end of the brake-wheel band or chain,
whilst the other end of the said band or chain is held fast by, the shifting core
of the series solenoid, the slight loosening of the band or chain around'
the brake wheel being effected, at the desired time, by that end of the band
or chain controlled by the weight of the carbon being momentarily loosened
through a moving part attached to it coming against a fixed stop.
In carrying the invention into effect, one of the carbons, preferably the
positive, is sufficiently weighted to rotate the brake wheel for the carbon's feed,
but its suspension cord is first taken over a small roller or pulley connected
to one end of a first order lever, whose other end has attached to it the one
end of the brake wheel band or chain, the said suspension cord afterwards
passing around a small pulley on the brake wheel's axis and proceeding there-
from in a suitable manner to the carrier of the negative. carbon, so that on
the rotation of the brake wheel the carbons are either advanced towards each
other or separated according to the direction of the said rotation.
The lever, as aforesaid, is jointed onto the head plate of the lamp's frame,
and that end of it to which the brake wheel band or chain is attached carries
a screw pin, which at certain times viz.:--In slipping the brake wheel for
the carbon's feed, comes against a stop formed on the said head plate, the
said screw pin enabling the amount of movement of the lever's end, to come
against the stop, being adjusted.
The brake wheel band or chain after passing round the periphery of the
brake wheel has its other end connected to a horizontal rocking beam or a
jointed yoke coupling the cores of the series and shunt solenoids, the connection
of the said band or chain being upon the series arm of the beam.
When the carbons and are are burning properly the one end of the band or chain
is held taut by the series solenoid against the weight of the carbon and holder
whose suspension cord passes over the small pulley on the lever, the position
of the said lever then being with its screw pin end free of the stop.
To feed the carbons, by slackening the band or chain upon the brake wheel,
!
: 54

page_text: the effect of the weighted carbon must be momentarily taken from acting
upon the end of the band or chain attached to the lever, and this is done by
the end of the said lever, after a time, coming against the stop. before described
on the head plate.
An arc lamp with the improvements as aforesaid applied is shown in the
annexed sheet of drawings in longitudinal elevation in Figs. 1 and 2 and in
underside plan in Fig. 3, the position of the carbon feeding mechanism in
Fig. 1 being one with the arc struck, and in Fig. 2 one with the feeding
taking place. Fig. 3 as aforesaid is taken upon the dotted line A Fig. 1, the
suspension cord a³, the break wheel band d and on- of the frame rods of the
lamps frame being cut through and shown in section.
In these drawings is the positive carbon, as its holder, and the suspension
cord connecting the said holder with the negative carbon holder a This
suspension cord passes round a small roller or pulley, c, connected to the one
end of a first order lever, c, whose other end has attached to it the one
end of a brake wheel band or chain d, the said suspension cord a³ afterwards
passing round a small pulley ea fast on the axis of the brake wheel e. The
carbons are therefore only advanced towards each other or separated when the
brake wheel e rotates in either the one or the other direction.
The weight
of the carbon a and its holder a² always tends to rotate the brake wheel in a
direction to feed the carbons.
The lever is jointed onto the head plate o of the lamps frame at c, and
the end of it carries a screw pin f which is adapted, in the movement of
the said lever in one direction, to come against the underside of of the head
plate as a stop, in order to loosen the end of the brake wheel band or chain
to slip the brake wheel e for the carbons feed.
The band or chain d after passing round the brake wheel e has its other
end connected to a rocking beam coupled to the cores of the series and
shunt solenoids hi, the connection of the said end being upon the series
solenoid arm of the beam.
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:-
First. In are lamps of the kind defined, utilizing the weight of one of the
carbons and its holder for keeping taut the one end of the brake wheel band
or chain, connecting the other end of the said band or chain to the shifting
core of the series splenoid; and causing the feed of the carbons to be brought
about by the momentarily loosening of that end of the band or chain controlled
by the weight of the carbon- and holder, substantially as described.
Second. In arc lamps of the kind described, the combination with the brake
wheel and its band or chain, of a lever connected to the one end of the said
band or chain, fitted with an adjustable stop, and fulcrummed to the frame
of the arc lamp, a weighted carbon and holder slung by a cord from said lever
and also coupled by the said cord to the brake wheel, and a shifting core and
series solenoid to the former of which the other end of the brake wheel band
or chain is connected, substantially as described and set forth.
Third. An electric arc lamp constructed with a carbon feeding mechanism
arranged and operating in the manner described and set forth.
W. P. THOMPSON & Co.,
11, Burlington Chambers, New Street, Birmingham,
Also at Liverpool, London, and Manchester,
Patent Agents for the Applicants.