MENTS IN HOLDERS FOR INCANDESCENT ELECTRIC LAMPS
Year: 1884

page_text: "
I, ALFRED SWAN of Low, Fell Works Gateshead-on-Tyne in the County of
Durham Engineer do hereby declare the nature of said Invention for IMPROVE-
MENTS IN HOLDERS FOR INCANDESCENT ELECTRIC LAMPS " to be as follows:-
My Invention has for its object to provide a simple cheap and efficient holder for
incandescent Electric lamps.
A holder constructed according to my Invention consists of a first part to which
the external wires are attached, the ends of the said wires being each received in
the slit or slot of a split screw secured to the said first part upon each of which
screws a nut is mounted which can be screwed down to give a good contact. The
said nuts each form the one end of a spiral spring the other end of each spring
coming into contact with contact pieces in a second part to which the bulb is fitted
the terminal wires protruding from the bulb being attached or fitted into these
contact pieces. The parts are secured together by a collar pieco with undercut
inclined slots in each end. A pin or pins on the first part of the holder engages or
engage with the slot or slots in the one end of the said collar after the manner of a
bayonet joint fastening and similarly a pin or pins on the second part of the holder
engages or engage with the slot or slots in the other end of the said collar so that
when the said two parts of the holder are in position the aforesaid springs are in
compression and give a good and firm contact for conveying the current from the
one part to the other of the holder. The pins may be in the collar and the slots in
the parts of the holder if desired or the collar may be secured in any other desired
way for example by means of screws.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.,
Agent for the said Alfred Swan,

page_text: I, ALFRED SWAN of Low Fell Works Gateshead-on-Tyne in the County of
Durham, Engineer do hereby declare the nature of my invention for "IMPROVE-
MENTS IN HOLDERS FOR INCANDESCENT ELECTRIC LAMPS and in what manner the
same is to be performed, to be particularly described and ascertained in and.by
the following statement :-
My Invention has for its object to provide a simple cheap and efficient holder for
incandescent electric lamps I will describe my Invention with reference to the
accompanying drawings wherein Figure 1 represents an exterior view and Figure 2
a vertical section of a holder constructed according to my Invention Figure 3
represents the part A separately and Figure 4 represents the part B separately.
Figures 5 and 6 represent separately the split screws and nuts with springs.
A. holder constructed according to my Invention consists of a first part A to
which the external wires x are attached the ends of the said wires being each
received in the slit or slot of a split screw a secured to or in the said first part
upon each of which screws a nut d is mounted which can be screwed down to give
a good contact The said nuts & each form the one end of a spiral spring e the
other end of each spring coming into contact with contact pieces b in a second
part B to which the bulb of the lamp is fitted or fixed the terminal wires
protruding from the bulb being attached to or fitted into these contact pieces b
The parts are secured together by a collar piece C there being grooves y in the
-pieces-A-and-B-and-projections-c-in-the-collar-C-as-shewn-in-figure-7-so-that-the-
parts A and B can be slidden into the collar the projections c entering vertical
portions of the grooves y and then by a twisting movement the said projections
are caused to enter the sideway portions of the said grooves and the parts A and B
are securely fastened together by the collar C. The projections c may be on the
parts A and B and the grooves y in the collar C but I prefer the arrangement shewn
as the projections c can then be struck up from the metal of the collar C and the
holder will have a better appearance than it will have with the other arrangement.
I do not limit my Invention to this mode of attachment as the collar may be
secured in any other desired way for example by means of screws.
Having now particularly described and ascertained the nature of my said
Invention and the manner in which the same is to be performed I declare that
what I claim is
First The holder for incandescent electric lamps consisting of the parts A and B
provided with means for giving contact between them substantially as herein before
described and illustrated and whether the said parts be connected together by the
collar C or otherwise.

page_text: Second In holders for incandescent electric lamps the means for joining the
parts A and B by a collar C the said means consisting of grooves in the parts A
and B and pins or projections on the collar C engaging with the said grooves sub-
stantially as and for the purpose hereinbefore described and illustrated in figure 7
of the accompanying drawings.