IMPROVEMENTS IN HOLDERS FOR INCANDESCENT ELECTRIC LAMPS
Year: 1886

page_text: Date of Application, 27th May, 1886.
Complete Left, 21st Mar., 1887.
Complete Accepted, 10th May, 1887.
I, REGINALD ARTHUR SMITH of 24 Brazenose Street, in the City of Manchester,
Electrical Engineer, do hereby declare the nature of my invention for IMPROVEMENTS
IN HOLDERS FOR INCANDESCENT ELECTRIC LAMPS to be as follows
My invention relates to that class of holder in which the lamp is attached by means
of spring hooks, which convey the current to the filament of the lamp. My invention
consists in making the non-conducting parts of the holder of earthenware, glass, or
other incombustible material; the various parts of the holder metallic and non-
conducting being of such form that they are held together by means of metallic
screws, or rivets passing through the non-conducting parts of the holder, and screwed
or riveted into the metallic parts.
To carry out this form of construction I make the claw or rest which supports the
neck of the lamp in one piece with the metallic base plate of the holder by which it
To such base-
is attached to the fitting, and which forms one terminal of the holder.
plate I attach the non-conducting parts (with the springs, and plate forming the other
terminal, inserted in them) by means of screws or rivets passing through the non-.
conducting parts and screwed or riveted into the metallic base-plate.
Dated this 54th dor of May 1886
REGINALD ARTHUR SMITH.

page_text: COMPLETE SPECIFICATION.
.
Improvements in Holders for Incandescent Electric Lamps.
I, REGINALD ARTHUR SMITH of 24, Brazenose Street, Manchester in the County of
Lancaster, 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 that class of holder in which the lamp is attached by means
of spring hooks, which convey the current to the filament of the lamp. My invention
consists in making the non-conducting parts of the holder of earthenware, glass, or
other incombustible material; the various parts of the holder metallic and non-
conducting being of such form that they are held together by means of metallic screws,
or rivets passing through the non-conducting parts of the holder, and screwed or
riveted into the metallic parts.
To carry out this form of construction I make the claw or rest which supports the
neck of the lamp in one piece with the metallic base-plate of the holder by which it is
attached to the fitting, and which forms one terminal of the holder. To such base-plate
I attach the non-conducting parts (with the springs, and plate forming the other
.terminal inserted in them) by means of screws or rivets passing through the non-
conducting parts, and screwed or riveted into the metallic baseplate.
Referring to the drawings accompanying this specification:-Fig. 1. shows the
complete lampholder with lamp attached, screwed to a nipple forming part of the
fitting. Fig. 2. is a view of complete holder from the end to which the lamp is attached.
Fig. 3. is a section of holder on the line shown at a a in Fig. 2. Fig. 4 is a section
on the line y y and Fig. 5 a section on the line 2. Figs. 6. and 7. show the non-
conducting parts of the holder detached.
a is a metallic piece forming the base-plate by which the holder is attached to the
fitting; this plate is formed in one piece with the claw or rest which supports the neck
of the lamp. To the plate a are attached by means of the screws 16 2 the non-
conducting incombustible parts of the holder cand d. On the non-conducting part d
is placed an insulated metallic piece e. It is convenient that this piece should be held
between the parts c and d as shown, but this is not essential. To the insulated metallic
piece e is attached the metallic spiral spring 1 which passes through a hole in the
insulating part d, and is provided with a hook for the attachment of one of the
loops of the lamp. To the base-plate a is attached another metallic spring f 2 which
passes through both insulating parts c and d and is provided with a hook for the
attachment of the other loop of the lamp. The spring 2 is prevented from making
contact with the metallic piece e by being led in the groove g formed in the
insulating part & round the outside of the tubular projection on the insulating part c.
Fig. 6 shows the tubular projection on the part c; and the corresponding annular
recess on the part d into which it fits is shown in Fig. 7. The spring f2 may be
soldered to the outside of the metallic baseplate after the holder is put together.
.

page_text: I do not limit myself to the number of screws or rivets by which the insulating
parts are attached to the base-plate.
The insulating parts may be formed by moulding the insulating material while in
a plastic state.
The current may be led into the lamp-holder to the insulated metallic piece e by
means of a wire passing through an insulator inserted in the nipple of the fitting.
From the piece the current passes through the spring 1 to the lamp, returning
through the spring 2 to the base-plate a, and so to the nipple which is connected
to the return conductor. This arrangement is shown in Fig. 3. It is evident that
the act of screwing the lampholder to the nipple makes both electrical connections.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to he performed, I declare that what I claim is :-
1. A lampholder in which two earthenware or other non-conducting incombustible
parts, containing an insulated metallic piece forming one terminal of the lampholder,
are attached to an external metallic piece by means of screws or rivets passing through
the said non-conducting incombustible parts and screwed or riveted into the external
metallic piece the said external metallic piece forming the base-plate by which the
holder is attached to the fitting and also the other terminal of the lampholder.
2. A lampholder having two earthenware or other non-conducting incombustible
parts, one of the said parts having a cylindrical tubular projection fitting into a
corresponding annular recess in the other part; the arrangement being that
commonly known as a spigot and faucet joint, substantially as and for the purposes
described.
3. The improved incombustible lampholder as a whole substantially as described
and shown.
Datad this 18th day of Marsh 1007