An Improvement in Holders for Incandescent Electric Lamps.
Year: 1890

page_text: Date of Application, 3rd Mar., 1890
Complete Specification Left, 16th Oct., 1890-Accepted, 22nd Nov., 1890
PROVISIONAL SPECIFICATION.
An Improvement in Holders for Incandescent Electric Lamps.
I, ADOLPH SCHIRNER, of No. 26, Schlegelstrasse, Berlin, Kingdom of Prussia,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to holders for incandescent electric lamps having a screw
threaded sleeve, into which the lamp is screwed with its mounting provided with a
corresponding outside thread.
Lamp-holders of this kind present the inconvenience that the lamps often become
loose therein from concussions, and that they are apt to be injured on being screwed
down too tightly. In view of obviating these inconveniences, I impart to the sleeve
of the holder such resiliency that it permanently exercises a moderate pressure from
all sides on the screw-threaded mounting of the lamp, and that if the lamp is screwed
in with too much force, the sleeve yields peripherally and allows the threads of the
mounting to slip over from the first-engaged threads of the sleeve to the preceding
ones.
For this purpose I render the metal from which the sleeve is made, as resilient as
possible, and I cut into the sleeve a number of longitudinal slits, which divide it into
as many segments or lobes, being at their base in connection with the remaining part
of the holder. In order to increase the elastic pressure with which the segments
bear against the mounting, a separate spring or springs may be combined with the
former.
Dated the 2nd J... SML 1900
J. H. JOHNSON & Co.,
Agents.
COMPLETE SPECIFICATION.
An Improvement in Holders for Incandescent Electric Lamps.
I, ADOLPH SCHIRNER, of No. 26, Schlegelstrasse, Berlin, Kingdom of Prussia,
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 :-
My invention relates to holders for incandescent electric lamps having a screw-
threaded sleeve, into which the lamp is screwed with its mounting provided with a
corresponding outside thread.
Lamp-holders of this kind present the inconvenience that the lamps often become
loose therein from concussions, and that they are apt to be injured on being screwed
down too tightly. In view of obviating these inconveniences, I impart to the sleeve
of the holder such resiliency that it permanently exercises a moderate pressure from
all sides on the screw-threaded mounting of the lamp, and that, if the lamp is screwed
in with too much force, the sleeve yields peripherally and allows the threads of the
mounting to slip over from the first-engaged threads of the sleeve to the preceding
ones.
For this purpose I render the metal from which the sleeve is made, as resilient as
possible, and I cut into the sleeve a number of longitudinal slits, which divide it into
as many segments or lobes, being at their base in connection with the remaining part
of the holder. In order to increase the elastic pressure with which the segments
bear against the mounting, a separate spring or springs may be combined with the
former.
In the annexed drawing a lamp-holder carried out according to my invention is

page_text: represented by Fig. 1 in elevation and by Fig. 2 in a view from below. Fig. 3
shows a portion of the lamp with the mounting thereof.
In Fig. 1, a is the sleeve of the holder, made as usual of sheet metal and having
screw-threads embossed thereinto, the metal employed for the manufacture of the
sleeve being hardened so as to render it elastic. Into the sleeve are cut the slits c,
Figs. 1 and 2, by which the segments or lobes 6 are produced. At its rim the sleeve
is provided with two collars f, also divided by the slits c and constituting a groove,
into which is placed the spiral spring e, having its ends connected together, so that
it forms an elastic ring encircling the segments b. In order that the holder may fully
answer its purpose, the parts have to be constructed in such manner that the
segments b exercise a pressure against the mounting d, Fig. 3, from the beginning
of its being screwed in, and that they be not strained over and above their resiliency
in case a slipping-over of the threads occurs.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
1. A holder for incandescent electric lamps having a sleeve made of resilient sheet
metal and with screw-threads embossed thereinto, the said sleeve being provided with
longitudinal slits whereby it is divided into segments capable of yielding when the
lamp is screwed into the sleeve with too much force, substantially as described.
2. The combination, with the lamp-holder defined by claim 1, of a spring or springs
acting against the segments of the sleeve, for instance of the annular spiral spring e,
placed in a groove formed upon the sleeve, substantially as specified.
Dated the 16th day of October 1890.
J. H. JOHNSON & Co.,
Agents.