Improvements in Electric Incandescent Lamps.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Electric Incandescent Lamps.
I, OTTO HENRY MICHAELSON, of 10, Elmwood Avenue, Charleston, in the
County of Kanawha and State of West Virginia, United States of America,
Merchant, do hereby declare the nature of this invention to be as follows:-
;-
This invention relates particularly to electric incandescent lamps and it has
for its object to provide a lamp of this character in which the bulb or globe and
its base may be separated for the purpose of cleaning or replacing a broken
filament with a new one and then again assembling the parts, and a further
object is to so construct the parts that a new. filament may be readily inserted.
The base of the lamp comprises a metal shell in which is cemented a base
piece of fictile material such as glass or porcelain and having an annular groove
in its outer end which forms a seat for a packing ring of rubber or other suitable
material. Through the base piece extend conductor wires one of which wires
projects through a ring of insulating material secured in the end of the shell
and engages with a metal ring on the outer side of said insulating ring and the
other wire engages at its end with an interiorly screw threaded ring secured in
said insulating ring, the two rings forming contacts for the main lead wires of
a circuit.
The projecting ends of the conductors are provided with means for clamping
the ends of a filament. This means consists in splitting the ends of the con-
ductors for a short distance and forcing the split ends tightly against the filament
by means of a collar movable on the conductor. The glass bulb is open at its
end and is provided with an annular channel to form a seat for the rubber
packing ring before mentioned.
In assembling the parts the ends of the filament are clamped to the conductors
and the base and bulb are then placed together with the packing ring in its
seat. The parts are then placed in an exhausting apparatus and the air exhausted
from the bulb. After exhausting the air the lamp is removed from the exhaust-
ing apparatus when the parts will be held together by exterior atmospheric
pressure. The lamp however may be opened at any time for the purpose of
cleaning or replacing a filament, by a sufficient bending pressure to separate the
parts at the packing joint. After the cleaning or replacing of a carbon the
parts may be again put together as above described, at a comparatively small cost.
Dated this 14th day of June 1898:
A. M. & WM. CLARK,
Chartered Patent Agents,
53, Chancery Lane, London.

page_text: Improvements in Electric Incandescent Lamps.
I, OTTO HENRY MICHAELSON, of 10, Elmwood Avenue, Charleston, in the
County of Kanawha and State of West Virginia, United States of America,
Merchant, 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 particularly to electric incandescent lamps and it has
for its object to provide a lamp of this character in which the globe or bulb and
its base may be separated for the purpose of cleaning or replacing a broken fila-
ment with a new one and then again assembling the parts. A further object
is to so construct the parts that a new filament may be readily inserted.
I will describe an electric lamp embodying my invention, and then point out
the novel features in the appended claims.
Reference is to be had to the accompanying drawings forming a part of this
specification, in which similar characters of reference indicate corresponding
parts in all the figures.
Figure 1 is a side view of a lamp embodying my invention;
Figure 2 is a longitudinal section thereof;"
Figure 3 shows the end of a conductor having filament-clamping means, and
showing the same in its open position; and
Figure 4 is a similar view but showing it in its clamping position.
The base of the lamp comprises a metal shell 1, in which is secured a base
piece 2, consisting of fictile material, such for instance as glass or porcelain,
and having an annular groove 3 in its outer end which forms a seat for a packing
ring 4 of suitable material, such for instance as rubber. The base piece 2 mav
be held in the shell 1 by means of a suitable cement. Conductor wires 5 and 6
extend through the base piece 2. The wire 5 projects through a ring 7 of
insulating material secured in the end of the shell 1, and engages with a metal
ring 8 on the outer side of said insulating ring 7, and the wire 6 engages at its
end with an interiorly screw threaded ring 9 secured in the insulating ring 7.
The rings 8 and 9 form contacts for the main lead wires of a circuit.
I provide the projected ends of the conductors 5 and 6 with means for clamp-
ing the ends of a filament 10. As here shown, this means consists in splitting
the ends of the conductors for a short distance, and these split ends may be
forced tightly against the filament by means of a collar 11 movable on the
conductor. In Figure 4, I have shown the position of the ring when the end
of the filament is clamped. The glass globe 12 is open at its end, and the wall
of said open end is provided with an annular channel 13, forming a seat for
the packing ring 4.
In assembling the parts, the ends of the filament 10 are clamped to the
conductors 5 and 6, and then the base and globe are placed together with the
packing ring 4 in its seat. The parts are then placed in an exhausting
apparatus and the air exhausted from the globe 12. After exhausting the air,
the lamp is to be removed from the exhausting apparatus and the parts will be
held together by exterior atmospheric pressure. The lamp however, may be
opened at any time for the purpose of cleaning or replacing a filament, by a
sufficient bending pressure to separate the parts at the packing joint. After
the cleaning or replacing of a carbon the parts may be again put together as
above described, at a comparatively small cost,

page_text: 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:
In an incandescent lamp, a base of insulating material having an annular
groove in its outer end, a metal shell in which the base is secured, conductor
wires extended through the base piece, a ring of insulating material in the
shell, a metal ring on said insulating ring and with which one of the wires
connects, a metal ring in the insulating ring and with which the other wire
connects, a globe having a channel around the wall of its open end, and a pack-
ing ring engaging said channel and in the groove of the base, substantially
as specified.
A. M. & WM. CLARK,
Chartered Patent Agents,
53, Chancery Lane, London.