provements in Apparatus for Regulating the Arc in Electric Aro Lamps.
Year: 1899

page_text: Date of Application, 18th Apr., 1893
Complete Specification Left, 19th Feb., 1900-Accepted, 24th Mar., 1900
PROVISIONAL DITRIFICATION
Improvements in Apparatus for Regulating the Arc in Electric Aro
Lamps.
I, PERCY NEWTON CHATTERLEY, of St. Bernard's Road, Olton, in the County of
Warwick, Electrical Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to electric are lamps and has for its object a new and
improved method of striking and maintaining the requisite length of are.
In carrying out my invention I employ a coil of wire wound on a bobbin
connected in series with the are and having a loose iron plunger or core inserted
therein.
At one end of this core is attached a chain band or cord. The other end of
this chain band or cord is connected to a dashpot, weight, or spring on the bed-
plate of the lamp.
Between the two ends of the chain band or cord 1 thread thereon a piece of
tube which is cranked eccentrically and which fits loosely. To this tube I attach
one or more rods or slides which are connected to the top carbon.
The cranked tube with the carbon holding attachment is made sufficiently heavy
to enable the top carbon to fall and rest on the bottom carbon when the lamp is
at rest by the force of gravity.
The action of the mechanism is as follows:
When the lamp is at rest the chain, band or cord is slack. but on switching
on the current the coil becomes magnetised and sucks the iron core up and draws
with it the chain, band or cord: this latter in turn lifts the daspot, weight or
spring and in so doing tightens itself on the cranked tube and also takes the
latter together with the top carbon with it.
This strikes the are. When the are becomes too long by reason of the carbons
being consumed the current in the series coil is lessened owing to the increased
resistance of the are. This decreases the pull of the coil on its core and it then
descends until such time as the dashpot, weight or spring meets a stop which takes
the weight.
As the case descends still further the pressure on the cranked tube is lessened
owing to the chain becoming slack and the tube with its carbon holding attach-
ment is free to slip and descend and feed the carbons together.
Instead of the cranked tube may use any curved, eccentric or twisted surface
on which the chain band or cord engages in such a way that when the tension is
applied to each end of the chain, band or cord. the pressure on the said surface
causes it to grip the chain hand or cord sufficiently to enable the surface and its
attachment to be moved in one or the other direction with the cord.
1 would also have it understood that various arrangements of electro magnets
may be employed for acting on the cranked surface together with the above
mentioned chain band or cord.
3711
1
+
1000

page_text: Improvements in Apparatus for Regulating the Arc in Electric Arc
Lamps.
I, PERCY NEWTON CHATTERLEY, of Newlyn, St. Bernard's Road, Olton,
Warwickshire, Electrical Engineer, 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 electric arc lamps and has for its object a new and
improved method of striking and maintaining the requisite length of arc.
The invention consists essentially in employing a coil wound on a bobbin in
series with the arc,-suitably attached to or mounted upon the framework of the
lamp, having a loose iron plunger or core inserted therein. The iron plunger
or core is attached to a dash pot weight or spring mounted on or attached to the
bedplate of the lamp by means of a metal chain, band, or cord, and which is slack
when the lamp is at rest. Between the end of the iron plunger and that of, say,
the dashpot a piece of tube.-constructed as hereafter described, is threaded so
as to work or slide freely on the said chain, band, or cord. To the tube is attached
one or more rods or slides which are connected to the top carbon. The tube and
carbon holding attachment are made sufficiently heavy, or are weighted, so as to
cause the top carbon to descend by the force of gravity and to be supported by the
bottom carbon when the lamp is at rest. When the current is switched on the coil
becomes magnetized and sucks the iron plunger up, drawing with it the chain,
band, or cord, which is tightened in and on the said tube for raising the top
carbon thereby striking the arc. But when the arc becomes too long by reason
of the carbon being consumed the current in the series coil is lessened owing
to the increased resistance of the are. This decreases the pull of the coil on its
core or plunger and permits of, say, the dashpot descending until it comes in
contact with a stop which takes the weight. As the core continues to descend
the chain, band, or cord becomes again slack in the said tube, thus permitting the
carbon holding attachment to descend and feed the carbons together.
In the drawings hereunto annexed an are lamp is shown constructed according
to this invention, in which:―
Figs. 1 and 2 are elevations drawn at right angles to each other.
A is the bed plate of the lamp, B its top plate, C the cover, and D) the bottom
carbon supporting plate: E rods or supports by which the bottom plate 1) and
bed plate are connected to the top plate B. F and G are respectively the top
and bottom carbons. H, II' are respectively the top and bottom carbon holders,
I the inner and J the outer globe or shield; K the terminal on the bed plate,
K the connection between the said terminal and the bottom plate D.
All the above described parts are of ordinary construction, and they are attached
together in the usual manner.
A coil of wire is wound on a hobbin in series with the are, and is hereafter
termed the coil L. The coil L is shown in the drawings attached to and supported
from the bed plate A by a number, say, three, of rods L'. Inserted within the
coil L is a loose iron plunger or core hereafter termed the plunger M. N is a
deshpot of ordinary construction, the piston or plunger of which is attached
by its lower end to the bed plate A. In some cases in place of a dashpot a spring
or weight may be employed. Also an adjustable stop (not shown in the drawings)
may be provided and mounted on the supporting rods L'. but in the lamp shown
in the drawings the bed plate A is made to take the place of the said stop. The
plunger M and dashpot are loosely connected together by a metallic band, Q,
as shown, but a chain or uretallic cord may, if desired, be used in place thereof.

page_text: When the lamp is at rest the band is of such a length as to be loose or slack
between the ends of the plunger M and dashpot N. On the metallic band Qis
threaded or mounted a piece of tube R arranged to fit the band loosely and to
slide freely thereon. The tube R is bent or curved or cranked out of centre as
shown, or it may be formed eccentrically, or twisted, or curved to any other
suitable shape or contour for causing the metallic band, when tension is applied
to its ends and it is drawn taut, to firmly grip by its friction contact, such curved
surface to enable the tube R to be drawn either upwards or downwards with the
said band. To the tube R at, say, the bent or curved portion thereof provision
is made for attaching, say by lugs R', armed with set screws as shown, one or
more rods S to the top carbon holder H. The tube R with the carbon holding
attachment is made sufficiently heavy, or it may be additionally weighted, to
enable the top carbon F to descend by the force of gravity and to be supported
by the bottom carbon G when the lamp is at rest.
It will be readily understood that a variety of arrangements of electro-magnets
might be substituted for the series wound coil L for acting upon the tube R and
metallic band Q.
Suitable electric connections, not shown in the drawings, but of ordinary con-
struction may also be employed and applied in the usual manner for conveying
the electric current to and from the lamp.
The action of the herein described mechanism is as follows:
When the lamp is at rest the metallic band Q is, as previously described, slack,
but on switching on the current the coil L becomes magnetised and sucks the
plunger M up drawing with it the cord Q; this latter in turn lifts the dashpot N,
and in so doing tightens itself on the curved portion of the tube R, and by its
frictional contact therewith causes the latter and the top carbon F to travel with it.
This strikes the arc. When the arc becomes too long by reason of the carbons F
and G being consumed the current in the series coil L is lessened owing to the
increased resistance of the arc.
This decreases the pull of the coil on its plunger M and it then descends until
such time as the dashpot N meets a stop, provided to arrest its descent, or with the
top of bed plate A, which then receives and supports the weight.
As the plunger continues to descend still further the pressure caused by the
frictional contact of the metallic band Q on the curved portion of the tube R is
reduced or lessened owing to the said band Q becoming slack and the tube R with
its carbon holding attachment is then free to slid downwards and to feed the
carbons together.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is--
1. In an are lamp such as herein described and illustrated a coil wound in
series with the are mounted on the bed plate of the lamp having a plunger inserted
therein, a dashpot also mounted upon the said bed plate and loosely connected to
said plunger by a metallic band, chain, or cord, and a bent or curved tube arranged
to be mounted upon said metallic band and to travel with the latter whenever it
is tightened by the action of the said coil, and the means described for attaching the
top carbon to the said bent or curved tube, all arranged and combined substantially
as herein before described and for the purposes set forth.
2. The combination and arrangement of the various parts constituting the arc
lamp substantially as described and illustrated in the accompanying drawings.
Dated this Seventeenth day of February 1900,
PERCY NEWTON CHATTERLEY.
By W. Fairburn-Hart,
Agent.