Improvements in the Regulating Mechanism of Electric Arc Lamps.
Year: 1894

page_text: Date of Application, 20th Oct., 1894
Complete Specification Left, 20th July, 1895-Accepted, 24th Aug.. 1895
PROVISIONAL SPECIFICATION.
Improvements in the Regulating Mechanism of Electric Arc Lamps.
We ANTHONY GEORGE NEW, and ARTHUR JAMES MAYNE, Electrical
Engineers of Palace Chambers in the City of Westminster, do hereby declare the
nature of this invention to be as follows:-
Our invention relates to improvements in the regulating mechanism of electric
arc lamps.
The carbons are regulated by means of cords passing over pulleys or drums on a
pair of toothed wheels gearing together, the arrangement allowing the bottom
carbon to be lowered and the upper weighted one to be raised simultaneously, the
carbons tending otherwise to come together. The pulleys are carried by a pivoted
rocking frame controlled by a magnet in series in the circuit which magnet by
moving the frame causes the arc to be struck. The frame also carries at one end
a toothed wheel gearing with one of the toothed wheels before mentioned and
controlling the movement of said wheels by means of an escapement mechanism,
such as a ratchet wheel, the ratchet wheel being controlled in turn by a paw!
carried by an armature, which is in turn controlled by a magnet placed in a shunt
circuit so that one tooth at a time may be released to allow feeding to take place.
The contact to the shunt coil is made actually through the ratchet wheel and
releasing pawl or catch, so that when a release of a tooth takes place the shunt
coil current is broken (either completely or through a resistance) forming in itself
a shunt to the break, thus preventing more than the feed of one tooth at a time.
The same result may be attained by employing two shunt magnets instead of one,
connecting them in series with one another and making one of them less delicate
than the other so that the less delicate one releases the catch (without contact
electrically through its armature and catch in this case) and the other more
delicate short circuits itself when the E.M.F. has risen to the feeding point and
thus makes the releasing magnet pass one tooth.
Dated the 18th day of October 1894.
PHILIP M. JUSTICE,
55 & 56 Chancery Lane, London, Chartered Patent Agent,
For the Applicants.
Improvements in the Regulating Mechanism of Electric Arc Lamps.
We, ANTHONY GEORGE NEW and ARTHUR JAMES MAYNE, Electrica
Engineers, of Palace Chambers, in the City of Westminster, do hereby declare th
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 :-
Our invention relates to improvements in the regulating mechanism of electri:
arc lamps.
The carbons are regulated by means of cords passing over pulleys or drums on
a pair of toothed wheels gearing together, the arrangement allowing the bottoni

page_text: carbon to be lowered and the upper weighted one to be raised simultaneously, the
carbons tending otherwise to come together. The pulleys are carried by a pivoted
rocking frame controlled by a magnet or solenoid in series in the circuit which
magnet by moving the frame causes the arc to be struck. The frame also carries
at one end a toothed wheel or train gearing with one of the toothed wheels before
mentioned and controlling the movement of said wheels by means of an escapement
mechanism, such as a ratchet wheel, the ratchet wheel being controlled in turn by
a pawl carried by an armature, which is in turn controlled by a magnet placed in a
shunt circuit so that one tooth at a time may be released to allow feeding to take
place. The contact to the shunt coil is made actually through the ratchet wheel
and releasing pawl or catch, so that when a release of a tooth takes place the shunt
coil current is broken (either completely or through a resistance forming in itself
a shunt to the break,) thus preventing more than the feed of one tooth at a
time.
To clearly explain our invention reference is made to the accompanying drawing
in which one form of same is illustrated and in which :-
Figure 1 is a front elevation of a lamp.
Figure 2 is a side elevation of same with part broken away.
Figure 3 is a plan and,
Figure 4 is a sectional plan on line x-x Figure 1.
The
Two drums a b to which are attached toothed wheels a' 6' gearing together are
carried in a frame pivoted at the points e to hanging posts attached to an
upper plate g. The frame also carries a train of gears 1. 2. 3 which operate an
escapement or ratchet wheel 4 said ratchet being controlled by a pawl carried by
a plate i secured to an armature ; but spaced apart by a distance piece k said
armature being situated above a magnet placed in a shunt circuit.
armature j carried by an arm m pivoted at n to a fixed bracket o secured to
one of the posts of said armature being held up by means of a spring and being
also adjustable between set screws 9 g. A spring connected to one end of
the pivoted frame and to the base plates enables the rocking frame to be
quickly operated. To the other end of this frame is attached the core t of a
solenoid u.
Over the drums ab pass metallic cords or chains vw the cord supporting a
frame 5 carrying the upper carbon, said frame being provided with a weight 6 or
being of a suitable weight itself and the cord u supporting a frame 7 carrying
the lower carbon. Both frames may have guides 8, 8 to enable them to slide
evenly on the supports 9, 9. The wire to the lower carbon may be taken
down one of these posts and connected to a binding post 10 carried by the
frame 7.
The upper carbon is connected to the binding post 11, through the framework,
upper plate g and by wire 12 or otherwise, the lower carbon is connected by the
wire secured to binding screw 10, said wire passing to the solenoid u and out to
the binding post 13 as shewn in Figures 1 and 3.
The shunt circuit is made from the post 13 to the magnet 7 through the
wire 14, out to the armature by the wire 15, through the pawl and ratchet 4
The
(when these two are in contact) and through the framework to the post 12.
arc is struck by the current passing through the solenoid u causing the core t to be
attracted thus rocking the frame d and bringing the ratchet wheel 4 into contact
with the pawl h. This causes the left hand side of the frame to be raised and the
right to be lowered thus separating the carbons, the position of the parts being
that shewn in the figures. When no current is passing through the lamp the
framed falls back drawing out the core of the solenoid, bringing the carbons
into contact and raising the ratchet 4 from the pawl h. A stop 16 is provided
to support the frame d when in this position, and a stop 17 to limit its upward
movement.
It will be seen that as the carbons burn away and the resistance increases
between the points the current flowing through the shunt circuit will be increased

page_text: causing the armature to be attracted to the magnet so that a release of a tooth will
take place, the shunt coil current being absolutely broken, the release of the tooth
allowing the gears a¹ b' to turn and thus through the drums and cords causing the
carbons to approach each other whereupon the current through the shunt circuit
will again be restored by the release of the armature bringing the pawl into contact
with the ratchet.
A resistance may be connected across the break (i.e. the ratchet and pawl)
instead of allowing a complete break or the same result may be attained by
employing two shunt magnets instead of one, connecting them in series with one
another and merely making one of them less delicate than the other so that the
less delicate one releases the catch (without contact electrically through its armature
and catch in this case) and the other more delicate one short circuits itself when
the E.M.F. has risen to the feeding point.
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 :-
1. In an arc lamp the employment of a shunt circuit for regulating the feed of
the carbons and mechanism arranged in said circuit and forming a part of same
whereby the circuit is broken (either completely or through a resistance) to allow
feeding to take place substantially as described.
2. In an arc lamp having a shunt circuit for the purpose described in the
foregoing claim the arrangement of two magnets in series so that one magnet
may be short circuited and the other compelled to feed substantially as described.
3. In an arc lamp the arrangement of series coil, rocking frame, shunt circuit and
its parts substantially as and for the purpose described.
4. The improvements in the regulating mechanism of electric arc lamps
substantially as described.
Dated the 4th day of July 1895.
PHILIP M. JUSTICE,
55 & 56 Chancery Lane, London, Chartered Patent Agent,
For the Applicants.