Improvements in Electric Arc Lamps.
Year: 1898

page_text: Improvements in Electric Arc Lamps.
I, BENNARD HENRY POMEROY, of Union Place and Cherry Street, Brooklyn
Hills, in the State of New York, United States of America, Manufacturer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to certain features of construction of electric arc lamps,
and more especially to the construction and arrangement of the condensing or
economy or choking coils or converters in alternating current lamps, to the means
for supporting the magnets in such lamps, to the provision of a steadying core
for the magnets, to the arrangement of the dashpot which steadies the movement
of the magnet yoke and parts carried thereby, and to the construction of the clutch
which engages the upper or movable carbon.
Referring to the accompanying drawings,
Figure is a view in side elevation of an electric arc lamp, of the alternating
current type, to which my improvements are applied;
Figure 2 is a detail view on a larger scale of the clutch, showing the upper
carbon in cross section.
The condensing or economy or choking coils or converters which are used with
alternating current lamps have heretofore been located externally to the lamp
and generally wholly independent thereof. I propose to make this coil or con-
verter, as shown at A, a part of the lamp itself, placing it so that it shall be
enclosed in the case with the lamp, and I also propose to use this coil or con-
verter as a means to vary the voltage. For this purpose the wire of the coil,
which is wound about the laminated core in several overlying layers, has loops
brought outside the coil at intervals to afford different points or attachments for
the flexible wire a which establishes connection to the switch or binding post B.
The terminal of the wire of the coil or converter is connected to the lower carbon
of the lamp. The connections of the other leg of the circuit are as usual. These
graduating loops are spaced so as to shut in or out more or less of the core, as
may be desired, to get the required voltage at the arc.
In order to avoid the humming noise common to lamps of this type or
character, the magnets C, instead of being secured rigidly to the frame, are
cushioned with respect to the frame. The end plates are perforated to receive
the guide rods D upon which they are free to slide, and cushion springs d are
interposed between the lower end plates and shoulders on the rods. The laminated
yoke e of the magnets is connected to the sleeve F which encloses the upper
carbon by a short arm f which projects from said sleeve or from an encircling
hub, a cushion spring fi being also interposed between said arm and yoke. On
the opposite side of the sleeve the encircling hub carries a longer arm f2 which
is connected to the dashpot G. The eccentric disposition of the dashpot occasions
a slight binding between the plunger and the cylinder which permits a greater
retarding effect to be secured with a dashpot of the same size. To steady the
magnet yoke in operation I propose to dispose at the extreme upper end of the
magnets a transverse laminated core or armature H which is fixed in position.

page_text: At the lower end of the sleeve F is secured a ring I from one side of which
depends a link i. A clutch plate ¹, having a hole adapted to receive the upper
carbon loosely, is pivotally connected to the lower end of the link i. When the
sleeve F is stationary and in an elevated position, as shown, the clutch plate i
drops slightly from the horizontal and binds upon and holds the upper carbon,
but when the sleeve F descends and the clutch plate strikes the top or cap of
the enclosing globe K, then the clutch plate will be brought to a horizontal position
and releases the carbon, permitting it to descend.
Dated this 19th day of Sentember 1898.
PHILIP M. JUSTICE,
Chartered Patent Agent, London, For the Applicant.
I, BENNARD HENRY POMEROY, of Union Place and Cherry Street, Brooklyn
Hills, in the State of New York, United States of America, Manufacturer, 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 certain features of construction of electric arc lamps,
and more especially to the construction and arrangement of the choking coils
in alternating current lamps, to the means for supporting the magnets in such
lamps, to the provision of a steadying core for the magnets, to the arrangement of
the dashpot which steadies the movement of the magnet yoke and parts carried
thereby and to the construction of the clutch which engages the upper or movable
carbon.
Referring to the drawings accompanying my Provisional Specification.
Fig. 1 is a view in side elevation of an electric arc lamp, of the alternating
current type, to which my improvements are applied.
Fig. 2 is a detail view on a larger scale of the clutch, showing the upper carbon
in cross section.
The choking coils which are used with alternating current lamps have hereto-
fore been located externally to the lamp and generally wholly independent thereof.
I propose to make this coil, as shown at A, a part of the lamp itself, placing it
so that it shall be enclosed in the case with the lamp, and I also propose to use
this coil as a means to vary the voltage. For this purpose the wire of the coil,
which is wound about the laminated core in several over-lying layers, has loops
brought outside the coil at intervals to afford different points or attachments for
the flexible wire a which establishes connection to the switch or binding post B.
The terminal of the wire of the coil is connected to the lower carbon of the lamp.
The connections of the other leg of the circuit are as usual. These graduating
loops are spaced so as to shut in or out more or less of the core, as may be desired,
to get the required voltage at the arc.
In order to avoid the humming noise common to lamps of this type or
character, the magnets C, instead of being secured rigidly to the frame are
cushioned with respect to the frame. The end plates are perforated to receive
the guide rods 1 upon which they are free to slide and cushion springs dare
interposed between the lower end plates and shoulders on the rods. The laminated
yoke e of the magnets is connected to the sleeve which encloses the upper
carbon by a short arm f which projects from said sleeve or from an encircling
hub, a cushion spring f¹ being also interposed between said arm and yoke. On

page_text: the opposite side of the sleeve the encircling hub carries a longer arm f³ which
is connected to the dashpot G. The eccentric disposition of the dashpot occasions
a slight binding between the plunger and the cylinder which permits a greater
retarding effect to be secured with a dashpot of the same size. To steady the
magnet yoke in operation I propose to dispose at the extreme upper end of the
magnets a transverse laminated core or armature H which is fixed in position.
When the
At the lower end of the sleeve F is secured a ring I from one side of which
depends a link i. A clutch plate i¹, having a hole adapted to receive the upper
carbon loosely, is pivotally connected to the lower end of the link i.
sleeve is stationary and in an elevated position, as shown, the clutch plate ¿¹
drops slightly from the horizontal and binds upon and holds the upper carbon,
but when the sleeve F descends and the clutch plate strikes the top or cap of
the enclosing globe K, then the clutch plate will be brought to a horizontal position
and releases the carbon, permitting it to descend.
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. The combination with an electric arc lamp of a choking coil located wholly
within the case of the lamp or forming a part of the same structure, substantially
as shown and described.
2. The combination with an electric arc lamp of a choking coil comprising
a laminated core having the insulated wire wound thereon with contacts brought
out at intervals to afford points of attachment for the connecting wire, so that
more or less of the core may be cut in to give the desired voltage at the arc, sub-
stantially as shown and described.
3. The combination with an electric arc lamp of a carbon controlling and feed-
ing magnet cushioned on the frame to prevent the humming noise, substantially
as shown and described.
4. In an electric arc lamp, the combination with the frame and the carbon con-
trolling and feeding magnet, of guide rods upon which said magnet is free to slide
and cushion springs interposed between the lower ends of such magnet and a
fixed shoulder or abutment, whereby the humming noise is prevented, substan-
tially as shown and described.
5. In an electric arc lamp, the combination with the carbon controlling and
feeding magnet and the armature, of an eccentrically disposed dashpot connected
with said armature, the eccentric disposition of said dashpot increasing the retard-
ing effect of the dashpot, substantially as shown and described.
6. In an electric arc lamp, the combination with the carbon controlling and
feeding magnet and the yoke or armature, of a transverse laminated core or
armature fixed in position near the poles of the magnet for steadying the magnet
yoke or armature in operation, substantially as shown and described.
7. In an electric arc lamp, the combination with the carbon controlling and
feeding magnet and a sleeve connected with the armature of said magnet and
surrounding the upper carbon, of a link depending from the lower end of said
sleeve and a clutch plate pivotally connected to the lower end of the link and
having a hole to receive the upper carbon loosely, said plate being adapted to rest
upon the top of arc-enclosing globe or other fixed stop in the descent of the sleeve
and be brought thereby to a horizontal position to release the carbon, substantially
as shown and described.
Dated this 1st day of June 1899.
PHILIP M. JUSTICE,
Chartered Patent Agent, London, For the Applicant.