Improvements in the Manufacture of Incandescent Electric Lamps.
Year: 1887

page_text: Improvements in the Manufacture of Incandescent Electric Lamps.
I, ALBERT HEINTZ, of 4, Averill Street, Fulham Palace Road, in the county of
Middlesex, Glass blower, 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 :-
My invention refers especially to the manufacture of incandescence or glow lamps
of low resistance, but my improvements may be used with equal advantage in the
manufacture of any other type of incandescent electric lamps.
In lamps of the kind first mentioned it is advantageous to have a straight carbon
rod as the light giving conductor, the leading in wires being at the same time at one
end of the bulb. A difficulty, however, exists in making a lamp of this kind in a
simple form owing to the fact that the carbon rod, being longer than the diameter of
the neck of the lamp, cannot be introduced through the said neck into the bulb as is
ordinarily done in the manufacture of incandescent lamps.
In order to overcome this difficulty I have devised a new method of manufacturing
the lamp which method I will now proceed to describe.
In the accompanying drawings
Figure 1 is an elevation of a lamp constructed according to my invention; and,
Figures 2 to 8 are views illustrating the various operations in the manufacture
of such a lamp.
In carrying my invention into practice I first take a glass tube a of the size
which the neck of the finished lamp is to have, and I draw out both ends of this
tube into a taper form, as shewn at b, c in figure 2. The end b is now closed and
a bulb d is blown in the ordinary manner as indicated in Figure 3. The end c is
next closed and the end 6 opened, a second bulb e being then blown as shown in
Figure 4. I now break off the end b and after heating the bulb e bring it into the
form of a cylinder, as shown in Figure 5, in a manner well known in the art of glass
blowing.
The carbon fafter it has been attached to the
now be introduced through the large opening
the lamp, as indicated in Figure 5. It will be
leading-in or conducting wires g can
of the bulb opposite to the neck of
noticed that the leading-in wires are

page_text: held together by a stem of glass ; which is subsequently attached to the neck of the
lamp although, until the bulb is closed in, the carbon remains loose in the same.
h
The next operation consists in closing the opening through which the carbon has
been introduced, this being accomplished by means of a heated glass rod in a manner
well known in the art of glass blowing. The lamp has then the form shown in
Figure 6.
A small glass tube j is next welded to the end of the bulb as shown in Figure 7,
this glass tube serving for exhausting the air from the lamp. The leading-in wires g
which as before mentioned are embedded in the glass stem i are now fastened to the
neck end of the lamp in a manner sufficiently known in the manufacture of electric
lamps to need no further description.
The exhausting of the air and the sealing of the glass tube j are also effected in a
manner well known to those acquainted with the manufacture of incandescence lamps.
The lamp as now finished has the form shown in Figure 1.
It is evident that the manner in which the leading-in wires are sealed in the neck
of the lamp can be varied, and that any of the methods of construction already known
can be substituted for the one hereinbefore described.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
-
1. The improvement in the manufacture of incandescent vacuum lamps, which
consists in forming a large opening in the bulb opposite to the neck of the lamp,
introducing the carbon with the leading-in wires attached through this opening, and
closing the opening again, all substantially in the manner above described.
2. The improved incandescent electric lamp constructed substantially in the manner
hereinbefore described.
D
T
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