Improvements in Electric Arc Lamps.
Year: 1888

page_text: Date of Application, 27th Dec., 1888
Complete Specification Left, 27th Sept., 1889-Accepted, 2nd Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Electric Arc Lamps.
We, GEORGE BEN GOODFELLOW, Mechanical Engineer, and PATRICK JAMES
CHARLES, Electrician, both of Hyde in the County of Chester, do hereby declare the
nature of this invention to be as follows
--
This Invention relates to electric are lamps in which differential solenoids or electro-
magnets are employed to operate the feeding device through arms or links respectively
connected to the cores of the solenoids or to the armatures of the electro-magnets.
According to these Improvements we employ (by preference) two solenoids one
of which is in the main circuit and is wound with thick wire; the other is wound
with thin wire and is included in a shunt circuit. The solenoids are provided with
cores which are balanced either by weights or by means of secondary cores or
magnetic shells. When the balancing is effected by means of secondary cores,
these are most conveniently made hollow, and arranged above the primary or ordinary
cores; a cord or cords is or are attached to each primary core, passed upwards through
the secondary core and carried round a pulley or pulleys, whence they are brought
down and made fast to the secondary core. If a magnetic shell is used, this consists
of a short tube of iron surrounding the upper part of the solenoid, and is therefore
equivalent to the secondary core. The connection of the magnetic shell with the
primary core is effected in the same manner as described for the secondary core.
The cores of the solenoids are connected to the opposite ends of two arms which
are secured together by a rule joint in practically the same manner as the two
legs of an ordinary two feet rule are connected. The outer end of that arm which
is connected to the series coil is connected also to the device which controls the feed
of the carbon. This device may be of any convenient character but we prefer to
employ a brake such as is commonly known and used for the purpose.
In this case
the brake rod is connected to the end of the arm.
Dated this 26th day of December A D 1888
WILLIAM E. HEYS,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Electric Arc Lamps.
We, GEORGE BEN GOODFELLOW, Engineer, and PATRICK JAMES CHARLES, Electrical
Engineer, both of Hyde in the County of Chester, 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 in which differential solenoids or electro-
magnets are employed to operate the feeding device through arms or links respectively
connected to the cores of the solenoids or to the armatures of the electro-magnets,
We will describe our Improvements with reference to the accompanying drawings
in which Fig.1 represents a sectional view of a lamp and Figs. 2, 3, 4, and 5 are
diagrams of various positions, which may be occupied by the arms or links whilst the
lamp is in and out of operation.
In carrying out our Invention we employ (by preference) two solenoids one of which
A, is in the main circuit and is wound with thick wire, and the other of which B is
in a shunt circuit and is wound with thin wire. The solenoids are provided with
cores CC which are balanced either by weights D D' or by means of secondary coros
or magnetic shells. When the balancing of the cores is effected by means of secondary
cores, the secondary cores are most conveniently made tubular and are suspended
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page_text: vertically above the primary cores from a pulley or pulleys by a cord or cords which
pass downwards through the tubular secondary cores and are made fast to the primary
cores below. If a magnetic shell is used as the balancing device, the magnetic shell
may consist of a short tube of iron surrounding the upper part of the solenoid. This
magnetic shell is equivalent to the tubular secondary core and is suspended and
connected to the primary core in a similar manner.
The cores of the solenoids (or the armatures of the electro-magnets when these are
used) are respectively connected to the opposite ends E E¹ of two arms which are
secured together by a pivot or rule joint F in practically the same manner as the two
legs of an ordinary two-feet rule are connected. The arms are also provided with a
stop arrangement which may consist of the pin J fixed in one of the arms and against
which the contiguous end of the other arm abuts so as to prevent the two arms from
passing a straight line one direction as in a two-feet rule and as indicated in Fig. 2. The
pivot F is fixed to the frame work of the lamp and the outer end of the arm E which
is connected to the core of the series or thick wire solenoid, is connected also to the
device which controls the carbon feed. This device may be of any convenient character,
but we prefer to employ a brake G such as is commonly known and used for the
purpose in other lamps of a similar character. In this case the brake rod H is
arranged to be operated by the arms E E¹, so as to release the brake and consequently
to permit the feeding device to act as soon as the main current in A is reduced or
ceases by the lengthening or extinction of the arc.
The Figures 2, 3, 4, and 5 represent the positions of the arms in the various con-
ditions of the current in the two solenoids (or electro-magnets) and indicate in what
manner the brake is operated thereby. In Fig. 2 owing to the lengthening of the
are, the current is divided and both solenoids are equally energised, their cores are
equally attracted, and the arms assume the position indicated. As the are gradually
lengthens the core C¹ is further attracted and lifts the arm E¹; the stop J being then
in contact with the end of arm E, both arms are moved together on the pivot J and
the end E being therefore depressed, the brake is released and the feed operates.
When the arc has thus been reduced in length and its resistance diminished, the main
current again passes through A, and B ceases to be energised. The position of the
arms is then as represented in Fig. 3 and the brake is on. If the are becomes extinct,
the position of the arms is as indicated in Fig. 4 and the brake is released.
When no
current is passing the arms assume the positions shewn in Fig. 5.
When electro-magnets are employed in place of the solenoids, the arms E E' are
connected to the armatures of the magnets and the brake is connected to the arm E is
a similar manner to that herein before described with reference to the solenoids.
Having now particularly described and ascertained the nature of our said Inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
In electric arc lamps: the combination and arrangement with differential solenoids
or differential electro-magnets of the jointed arms E E¹ constructed and operating
substantially as and for the purpose herein before described and as illustrated by the
accompanying drawings.
Dated this 25th day of Santamber AD 1889
WILLIAM E. HEYS,
Agent for the Applicants.