Improvements in Holders for Incandescent Electric Lamps.
Year: 1894

page_text: Date of Application, 11th Jan., 1894
Complete Specification Left, 29th Jan., 1894-Accepted, 3rd Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
I, JOHN BIRNIE CLAYTON EVANS, of Redhayes, Montague Road, Richmond,
in the County of Surrey, Electrical Engineer, do hereby declare the nature of this
invention to be as follows:-
My invention relates to incandescent lamp holders of that class designed to be
applied to candelabra and to represent candles.
Hitherto there has been considerable difficulty in firmly fixing such lamp holders
in the candle sockets.
Now the objects of my invention are to so construct holders that they can be
readily and firmly secured in the sockets notwithstanding slight variations in the
diameter of the latter and also to provide means whereby the lamp may be brought
closely down onto the tube representing the candle.
According to my invention the stem or standard of the holder (to the upper end
of which the lamp is connected in the usual manner) is provided with a base adapted
to fit the candle sockets formed in two or more parts of vulcanized fibre or other
hard nonconducting material.
These parts of the base are provided with inclined adjacent surfaces in such a
manner that when one part is moved relatively with the other part or parts the said
base will be expanded in order to tightly fit the socket.
In conjunction with this divided base I employ a washer which is passed over
the stem of the holder and approximately fits the candle sockets and on the stem I
may place a out which when screwed down against the washer serves to draw up
the stem to tighten the parts of the base.
In order that the length of the stem may be adjusted the latter is advantageously
formed in two parts fitting one into the other telescopically and one part can be
provided with a notch to receive the end of one of the conducting wires to form a
connection.
Dated the 11th J
COMPLETE SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
I, JOHN BIRNIE CLAYTON EVANS, of Redhayes, Montague Road, Richmond,
in the County of Surrey, Electrical 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 incandescent lamp holders of that class designed to be
applied to candelabra and to represent candles.
Hitherto there has been considerable difficulty in firmly fixing such lamp holders
in the candle sockets.
Now the objects of my invention are to so construct holders that they can be
[Price 8d.]

page_text: readily and firmly secured in the sockets notwithstanding slight variations in the
diameter of the latter and also to provide means whereby the lamp may be brought
closely down onto the tube representing the candle.
According to my invention the stem or standard of the holder (to the upper end
of which the lamp is connected in the usual manner) is provided with a base
adapted to fit the candle sockets formed in two or more parts of vulcanized fibre or
other hard non-conducting material, and the stem or standard is advantageously
formed in two parts fitting one into the other telescopically.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
Figure 1 is a sectional elevation of a lamp-holder provided with my improve-
ments; and,
Figures 2 to 5 are views of details of the same hereinafter described.
a is a socket into which the holder is fitted, is the stem or standard of the
holder, carrying the lamp c at its upper end, and d is the opal tube representing
the candle.
e, e, e' are the parts forming the base, the said parts being shewn in section in
Figure 2 and in plan in Figure 3; the parts e, e on their opposite surfaces are
inclined, and the part e' is also made somewhat of a wedge-shape so that, when the
parte (assuming it to be in the position relatively with the parts e, e as shewn in
Figure 1) is moved upwards, it will press the parts e, e laterally and expand the
base in order that the latter shall tightly fit the socket. The part e' is fixed to the
lower end of the standard preferably by screw-threads, as shewn, so that by
raising the said stem 6 the said part e' will be also raised. is a washer which I
employ in conjunction with the divided base, the said washer being passed over the
stem 6 and approximately fitting the socket a, and g is a nut screwed onto the said
stem b and serving when screwed down against the washer to draw up the stem to
tighten the parts of the base in the manner hereinbefore described.
In order that the length of the stem may be adjustable to permit of bringing the
lamp e close down onto the opal tube, the said stem is formed in two parts as shewn
in Figure 4 which represents the two parts in elevation, one part being formed with
a split socket into which the other part of the stem fits as shewn most clearly in
Figure 1.
is a terminal with which one of the leading-in wires is connected, and j is a
notch which I advantageously employ in the stem for the connection of the other
leading-in wire. In order to permit of inserting the leading-in wires into the
interior of the opal tube d the base pieces e, e e' are notched at k k as shewn, and
the washer is provided with the holes, as shewn in Figure 5 which is a plan
view of the said washer.
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. A holder of the kind referred to for incandescent electric lamps, designed to be
fixed by means of a divided base piece adapted to be expanded in order to cause it
to fit the socket to which it is applied, substantially as described.
2. In an electric lamp holder of the kind described, the combination with the
stem or standard of the divided base piece formed in three parts and provided with
inclined surfaces and means for moving one of the said pieces relatively with the
other pieces, substantially as described.
3. In an electric lamp holder of the kind described, the combination with the
stem or standard of the said holder, of a base piece formed in three pieces such
as e, e, e', a washer such as fand a nut such as g, substantially as described.
4. In a lamp holder of the kind described a stem or standard formed in two
parts adapted to slide relatively with one another substantially as, and for the
purpose, described.

page_text: 5. The manufacture and use of the improved lamp holder hereinbefore described
and illustrated in the accompanying drawing.
Dated this 29th day of January 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.