MENTS IN ELECTRIC LAMP HOLDERS
Year: 1882

page_text: LETTERS PATENT to Joseph Wilson Swan of Newcastle upon Tyne Electrician
and Cameron Swan of Cambridge Street Pimlico in the County of Middlesex
Th
Tmention of "TODAVAT TAT FI PATRIA LAND HOLDERS "
PROVISIONAL SPECIFICATION left by the said Joseph Wilson Swan and
Cameron Swan at the Office of the Commissioners of Patents on the
15th September 1882.
"
JOSEPH WILSON SWAN of Newcastle upon Tyne Electrician and CAMERON SWAN
IMPROVE-
of Cambridge Street Pimlico in the County of Middlesex Engineer
MENTS IN ELECTRIC LAMP HOLDERS
"
The object of this invention is to facilitate and ensure the making a good
electrical connection between the terminal loops of Incandescent Electric Lamps,
and the conducting wires conveying the electric current.
One of the chief features of the improved lamp-holder, is the employment of
peculiarly formed hooks, (two of which are fitted to each lamp-holder,) to engage
with the terminal loops of the lamp and make firm contact with them independently
of springs extraneous to the hooks, such as have hitherto been used to aid in con-
firming the contact between the terminal loops of the lamp and the hooks of the
lampholder.
The hooks of the improved holder are so formed as to admit of the passage of
the terminal loops of the lamp, over the hooks and between two or more contiguous
coils of wire; the tendency of the coils to close laterally upon the hooks has the
effect of nipping the loops of the lamp between them-that is to say-the wire out
of which the hook is made is continued in one or more coils which lie close to the
curve of the hook.
The hooks of our improved holder are formed of hard and elastic metallic wire,
preferably of a hard alloy of silver and copper, but brass, bronze, platinum or any
suitable metal may be used for the purpose.
Two of the hooks, before described are affixed side by side, at the same distance.
apart as the terminal loops of the lamp, to a block of wood, ebonite, steatite, or
other suitable non-conducting substance,

page_text: The conducting wires may be either directly attached to binding screws or their
equivalents, in metallic connection with the two hooks; or the piece carrying the
hooks may be provided with springs or projections on opposite sides in metallic
connection with the hooks, which may be so arranged that when the piece carrying
the hooks is pushed into a socket piece to which the conducting wires are connected
the required electrical connection will be made with the wires which convey current
to the lamp.
When the lamp is not pendant from the holder, supports are fixed to it, so as to
support the lamp at the juncture of the neck with the bulb and hold it in an upright
position.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Wilson Swan and Cameron Swan in the Great Seal Patent
Office on the 15th March 1883.
JOSEPH WILSON SWAN of Newcastle upon Tyne Electrician and CAMERON SWAN
of Cambridge Street Pimlico in the County of Middlesex Engineer "IMPROVE-]
.MENTS IN ELECTRIC LAMP HOLDERS"
The object of our said Invention is to facilitate and ensure the making a good
electrical connection between the terminal loops of Incandescent Electric Lamps
and the conducting wires conveying the electric current.
One of the chief features of the improved lamp holder is the employment of
peculiarly formed hooks (two of which are fitted to each lamp holder) to engage
with the terminal loops of the lamp and make firm contact with them independently
of springs extraneous to the hooks such as have hitherto been used to aid in con-
firming the contact between the terminal loops of the lamp and the hooks of the
-lamp holder.
The books of the improved holder are so formed as to admit of the passage of
the terminal loops of the lamp over the hooks and between two or more contiguous
' coils of wire the tendency of the coils to close laterally upon the hooks has the
effect of nipping the loops of the lamp between them that is to say the wire of
which the hook is made is contained in one or more coils which lie close to the
. curve of the hook the books of our improved holder are formed' of hard and
elastic metallic wire preferably of a hard alloy of silver and copper but brass bronze
platinum or any suitable metal may be used for the purpose.
--
Two of the hooks before described are affixed side by side at the same distance
apart as the terminal loops of the lamp to a block of steatite porcelain wood
ebonite or other suitable non-conducting substance. The conducting wires may be
either directly attached to binding screws or their equivalents in metallic connection
with the two hooks or the piece carrying the hooks may be provided with plates
springs or projections on opposite sides in metallic connection with the hooks which

page_text: may be so arranged that when the piece carrying the hooks is pushed into a socket
piece attached to an electrolier or other electric light fixture to which the conducting
wires are connected the required electrical connections will be made with the wires
which convey current to the lamp.
When the lamp is not pendant from the holder supports are fixed to it so as to
support the lamp at the junction of the neck with the bulb and hold it in an upright
position.
And in order that our said Invention may be fully understood we will now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figures 1 and 2 of the accompanying drawings are elevations at right angles
to each other of an incandescent electric lamp contained in a holder constructed
according to our Invention The body part A of the holder is made of steatite
porcelain wood ebonite or other non conducting material and in this body part are
inserted the wires b upon which are formed the hooks 6' under which the terminal
loops c of the lamp Care passed. The hooks 62 are so formed as to admit of the
ready passage of the terminal loops c thereunder and the wires bare continued
in one or more coils 63 which lie close to the curve of the hook so that the loops c
of the lamp when the said lamp is in position on the holder engage between and
are nipped closely by two or more contiguous windings or laps of the said coils b³
The inward ends of the conducting wires from which the hooks are formed are
bent at a right angle and are inserted and soldered into the ends of the binding
screws d to which the conducting or line wires e are attached-The body part A
is formed with a screw a by which it may be readily attached to an electrolier
or other fixture. When the lamp is. not pendent from the holder spring wires or
supports fare fixed to the body part a which wires or supports hold the bulb C
firmly in position.
Figures 3 to 8 represent a modification of the holder wherein the body part is
formed in two pieces A2 and As the part A2 constituting a plug carrying the
wires with the hooks and coils 62 63 and also the supports f if they be
required. The wires bare connected to conducting plates g having projections
g³ thereon.
Figure 3 is a side elevation. Figure 4 is a vertical section and Figure 5 is
a plan of the said part A2 and the parts carried by it-Figures 6 and 7 are vertical
sections and Figure 8 is a plan of the part A³ which constitutes a socket into
which the plug part A2 is passed-The said part A³ is provided with conducting
springs h provided with recesses h² and connected by the conducting connections
with the line wires e When the plug part A2 is passed into the socket part A³
the projections g² engage with the recesses h² and the conducting circuit of the
wires through the filament of the lamp is thereby made j is the attachment for
connecting the holder to the fixture with which it is used.
In Figure 4 the hooks are formed with adjacent coils as herein before described
so as to insure a certain electric contact of the hooks with the terminal loops of
the lamp The arrangement of the socket part A³ shewn in Figures 6. 7 and 8
is arranged so that only one of the conducting wires e is insulated the other
conductor being the metal of the bracket or electrolier the attachment ; when
screwed in place acting upon the wedged shaped end of the socket piece which
being split as shewn is thereby caused to firmly grip the said wire The metal
at i forms the electrical connection for the one wire with one of the springs h and
the metallic attachment j forms the conductor between the electrolier or bracket
and the other spring h to complete the circuit for the filament-Figures 9 and 10
are vertical sections of a modified form of the part A³ wherein the said part is
arranged so that the conducting wires e are nipped between the fixed ends of the
clip springs h and a piece of non conducting material k carried by a brass nozzle
attachable to an electrolier or other electric light fixture-The conducting wires e
are nipped between the ends of the said springs h and the piece k by a screw m

page_text: which passes centrally through the material of which the socket piece is formed
and screws into the nozzle binding the socket A³ and nozzle together and
securing the ends of the conducting wires e firmly in position In figures 6 to 10
the clip springs are shewn as being fastened on opposite sides of the socket piece A³
by small screws h³.
Having now described and particularly ascertained the nature of our said
Invention and the manner in which the same is or may be used or carried into
effect we would observe in conclusion that what we consider to be novel and
original and therefore claim as the Invention secured to us by the hereinbefore in
part recited Letters Patent is
First In Electric lamp holders forming the connection between the line or
circuit wires and the terminal wires of the lamp by means of hooks and coils
formed on the ends of the wires constituting the terminations of the line or circuit
wires in the holder so that the said terminal wires can be readily engaged in
electrical contact with the said coils substantially as hereinbefore described with
reference to the accompanying drawings.
Second-The combination with electric lamp holders of spring wires or supports
(f) to support the bulb of the lamp as hereinbefore described and illustrated in the
accompanying Drawings.
Third Forming electric lamp holders in two parts (A2 A³) provided with
engaging springs (g. h) substantially as hereinbefore described and illustrated in
the accompanying drawings.
Fourth-The electric lamp holder herein before described and illustrated in
Figures 1 and 2 of the accompanying drawings.
Fifth The electric lamp holder hereinbefore described and illustrated in
figures 3 to 10 of the accompanying Drawings.
In witness whereof I the said Cameron Swan have on behalf of myself
and the said Joseph Wilson Swan to this our Specification set my hand
and seal this twelfth day of March One thousand eight hundred and eighty
three
CAMERON SWAN.
(L.S.)