Improvements in Electric Glow Lamps.
Year: 1898

page_text: Date of Application, 8th June, 1898
Complete Specification Left, 4th Mar., 1899-Accepted, 8th Apr., 1899
PROVISIONAL SPECIFICATION.
Improvements in Electric Glow Lamps.
We, SIEMENS BROTHERS & Co. LIMITED, of 12, Queen Anne's Gate, West-
minster, in the County of London, Electrical Engineers, do hereby declare the
nature of this invention (as communicated to me from abroad by Siemens &
Halske Aktien Gesellschaft, of Markgrafen Strasse 94, Berlin, S W., Electrical
Engineers) to be as follows:-
This invention relates to glow lamps of the kind in which the foot or base
of the glass globe is formed with two opposite recesses or projections into which
corresponding inner projections or recesses of the metal fitting enter with spring
action According to the present invention the foot or base of such glow lamps
is made of an oval section instead of circular the recesses or projections being made
at that part of the base which is largest in diameter. The metal fitting 18
made circular, and for mounting it upon the globe base it is first com-
pressed by the fingers at opposite points at right angles to a line connecting
the diametrically opposite projections or recesses thereon thus increasing the
distance between these, and rendering the metal fitting of an oval shape similar
to but somewhat larger than the globe base, so that this can be inserted.
Upon then releasing the fitting this will spring back into the original circular
form whereby its projections or recesses will be made to engage with the recesses
or projections of the lamp base so as to secure the fittang on, the globe.
For removing the fitting, it only requires to be compressed in the same manner
as before, when the globe base can be drawn out The spring action of the
fitting, can, if necessary, be increased by making suitable slits therein. The
oval globe base can also be used in combination with fittings in which a ring
or cap is provided with inner projections that are sprung into the 'recesses on
the globe foot, which ring or cap is then secured by hooking, soldering or the
like to a contact ring which is slid over the outside thereof
Dated this 8th day of June 1898
ABEL & IMRAY,
Agents for the Applicants.
Improvements in Electric Glow Lamps.
We, SIEMENS BROTIIERS & Co. LIMITED, of 12, Queen Anne's Gate, West-
minster, in the County of London, Electrical Engineers, do hereby declare the
nature of this invention (as communicated to us from abroad by Siemens &
Halske Aktien Gesellschaft, of Markgrafenstrasse, 94, Berlin, S.W., Electrical
[Price 8d.1

page_text: Engineers), 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 glow lamps of the kind in which the foot or base
of the glass globe is formed with two opposite recesses or projections into which
corresponding inner projections or recesses of the metal fitting enter with spring
action. According to the present invention the foot or base of such glow lamp
is made of an oval or oblong section instead of circular the recesses or projec-
tions being made at that part of the base which is largest in diameter. The metal
fitting is made circular, and for mounting it upon the globe base it is first com-
pressed by the fingers at opposite points at right angles to a line connecting
the diametrically opposite projections or recesses thereon thus increasing the
distance between these, and rendering the metal fitting of an oval shape similar
to but somewhat larger than the globe base, so that this can be inserted.
Upon then releasing the fitting this will spring back into the original circular
form whereby its projections or recesses will be made to engage with the recesses
or projections of the lamp base so as to secure the fitting on the globe.
Figure 1 of the accompanying drawing shews by way of example, a cross
section through a globe foot a with the fitting a placed thereon The globe foot
is made of oval or oblong form and has at the end of its larger diameter the
recesses b.
The fitting is circular and has two opposite inner projections d which engage
with the recesses b For inserting the globe base into the fitting this is pressed
together at opposite points at right angles to the projections d d, whereby the
distance between the latter will be sufficiently increased to allow of the globe
base being passed through between them, as, shewn in the vertical section at
Figure 2, upon then releasing the fitting, this will spring back into the circular
form, thereby causing the projections d to engage with the recesses bas at
Figure 1.
For removing the fitting, it only requires to be compressed in the same manner
as before, when the globe base can be drawn out The spring action of the
fitting, can, if necessary, be increased by making suitable slits therein The
oval globe base can also be used in combination with fittings in which a ring
or cap is provided with inner projections that are sprung into the recesses on
the globe foot, which ring or cap is then secured by hooking soldering or the
like to a contact ring which is slid over the outside thereof
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim 18:
Constructing the base or foot of an electric glow lamp of oval or oblong cross
section, with recesses or projections formed at opposite ends of the larger diameter
thereof substantially as and for the purpose set forth
Dated this 4th day of March 1890
ABEL & IMRAY,
Agents for the Applicants.