An Improved Method of Renewing Incandescent Electric Lamps.
Year: 1892

page_text: Date of Application, 13th Apr., 1892
Complete Specification Left, 13th Jan., 1893-Accepted, 18th Mar., 1893
PROVISIONAL SPECIFICATION.
An Improved Method of Renewing Incandescent Electric Lamps.
I, ERNST AUGUST KRUGER, of Pasing, near Munich, in the Kingdom of Bavaria
and German Empire, Engineer, do hereby declare the nature of this invention to be
as follows:
This invention refers to incandescent electric lamps.
According to a method hitherto employed for renewing incandescent lamps, a slit
was made in the glass bulb of the exhausted lamp, through which the old filament
could be withdrawn and a new one introduced. Such method has, however, been
found unsuitable and effects little economy, owing to the inconvenient position of the
slit, which greatly increases the difficulty of handling the apparatus for the purpose
of fixing the carbon filament lengthwise; and, in sealing the bulb by means of the
heat produced by the electric current, it not infrequently happens that the current
flows through the filament, which thus becomes strongly heated in the presence
of oxygen, the lamp thereby necessarily suffering in value to a considerable extent.
The present invention relates to a method which avoids the above-mentioned
disadvantages.
The new method consists in dividing the glass bulb in a plane lying at right
angles to the long axis of the lamp. Pear-shaped bulbs can be thus treated with
remarkable ease and safety. In this way, the glass bulb is divided into two parts a
and 6; an opening c of considerable extent being available, thus permitting the
withdrawal of the old and the introduction of the new carbon filament without
difficulty. After the new carbon filament has been fastened in in the required
manner, the part 6 of the glass bulb is once more united to the part a by heating
the edges of the two parts with a flame from a blow-pipe. After the parts have
been thus united, a tube for exhausting the bulb can be drawn out at the upper part
of the bulb, which tube is sealed up again after the exhaustion of the air has been
effected in the ordinary manner.
Dated the 13th day of Anril 1892
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.
COMPLETE SPECIFICATION.
An Improved Method of Renewing Incandescent Electric Lamps.
I, ERNST AUGUST KRÜGER, of Pasing, near Munich, in the Kingdom of Bavaria
and German Empire, 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 refers to the renewal of incandescent electric lamps by the
replacement of a broken or used up filament with a newly connected filament.
The present invention relates to a method by which this renewal may be more
easily performed and with more certainty of a satisfactory result, than with other
methods previously proposed and especially that according to which a slit is made
at the end of the lamp through which the used filament or remnants thereof are
withdrawn and the new filament inserted.
The new method consists in dividing the glass bulb into two parts in a plane lying
at right angles to the long axis of the lamp and at a convenient distance from the
base of attachment of the filament.

page_text: Pear-shaped bulbs can be thus treated by the ordinary method of severing glass
with remarkable ease and safety. In this way, the glass bulb is divided into two
parts a and b, as shown in the drawings filed herewith an opening c of considerable
extent being available, thus permitting the withdrawal of the old and the introduction
of the new carbon filament without difficulty. After the new carbon filament d has
been fastened in in the required manner, the part of the glass-bulb is once more united
to the part a by heating the edges of the two parts with a flame from a blow pipe.
After the parts have been thus united, a tube for exhausting the bulb can be drawn
out at the upper part of the bulb, which tube is sealed up again after the exhaustion
of the air has been effected in the ordinary mauner.
The said exhaustion tube may also be drawn out before the two parts of the lamp
are re-connected.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A method of renewing incandescent electric lamps in which the bulb thereof is
divided into two parts on a plane perpendicular, or substantially so, to the long axis
of the lamp for replacement or renewal of the filament and is subsequently reunited
previous to exhaustion for the purpose described.
1011
1000
R. HADDAN,
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, Agent for Applicant.