Year: 1894

page_text: Date of Application, 16th Apr., 1894
⚫ Complete Specification Left, 18th Jan., 1895-Accepted, 13th Apr., 1895
We, THE EDISON AND SWAN UNITED ELECTRIC. LIGHT COMPANY,
LIMITED, and JOHN MILES Moffat, of 100, Victoria Street, Westminster, in
the County of London, Electrician, do hereby declare the nature of this invention
to be as follows:
This invention relates to a simple and compact construction of switch in
combination with the cap and socket of an electrical glow lamp, whereby a single
filament or the one or both of a pair of filaments in the bulb can be put into or out
of circuit with the conductors.
For this purpose, there are provided within the cap of the glow lamp a pair of
springs the one carrying one of the plates which bear on the spring plungers in the
socket, the other connected to one of the leading in wires of the filament, whilst
the other leading in wire is connected to the other plate. Between the springs
there is fitted to turn or slide a rod or wire the ends of which project through the
cap and serve as the studs which engage in the bayonet catch notches of the
socket.
On this rod or wire is an insulated projecting metallic part which, by pushing or
partly turning the wire, is made to press against the two springs above mentioned,
thereby making electrical connection from the leading in wire to the plate to which
it was not otherwise connected, and so bringing the filament into circuit. By
pushing or turning the wire back, this connection is broken and the filament is
excluded from the circuit. When there are two filaments in the bulb, the leading in
wires for one of them are connected as above described, those of the other being
connected in the usual way to the plates of the cap which bear against the spring
plungers of the socket. In this case the switch serves to kindle or extinguish
only the one of the two filaments. If the leading in wires for both filaments are
connected as first described, the switch serves to kindle or
extinguish both.
By providing another pair of contact springs and another projection on the wire
or rod and suitably connecting the leading in wires of the two filaments to the
springs and conductors, the filaments can be connected either in parallel or series,
or entirely disconnected according to the position of the rod or wire.
Dated this 16th d f Au 1904
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improvement in Electrical Glow Lamps.
We, THE EDISON AND SWAN UNITED ELECTRIC LIGHT COMPANY
LIMITED, and JOHN MILES MOFFAT, of 100 Victoria Street, Westminster, in
the County of London, Electrician, 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 :-
This invention relates to a simple and compact construction of switch in

page_text: combination with the cap and socket of an electrical glow lamp, whereby a single
filament or the one or both of a pair of filaments in the bulb can be put into or out
of circuit with the conductors.
For this purpose as shewn in plan in Fig. 1 and in section on X X in Fig. 2 of
the accompanying drawings, there are provided within the cap A of the glow
lamp B a pair of springs CD the one C carrying one of the plates E which bear
on the spring plungers which are usually provided in the socket, the other D
connected to one of the leading in wires of the filament, whilst the other leading in
wire is connected to the other plate F. Between the springs C D there is fitted
to slide a rod or wire G the ends of which project through the cap and serve as the
studs which engage in the ordinary bayonet catch notches of the socket.
On this rod or wire G is an insulated projecting metallic part H, which by
pushing the wire G may be made (as indicated by dotted lines in Fig. 1) to press
against the two springs CD, thereby making electrical connection from the leading in
wire to the plate to which it was not otherwise connected, and so bringing the
filament into circuit. By pushing the wire back, this connection is broken and the
filament is excluded from the circuit.
Instead of pushing the wire G, it may be turned like the plug of a stop cock,
being then constructed as shewn to a magnified scale in cross section Fig. 3, and
side view Fig. 4; the metallic segment H which connects or disconnects the
wires CD being fixed on insulating material.
When there are two filaments in the bulb, the leading in wires for one of them
are connected as above described; those of the other are connected in the usual
way to the plates of the cap which bear against the spring plungers of the socket.
In this case the switch serves to kindle or extinguish only the one of the two
filaments. If the leading in wires for both filaments are connected as first described
the switch serves to kindle or extinguish both.
Fig. 4 shews a construction of switch in combination with a lamp socket as
already described but in this case the connections with the two lamp filaments L L'
are shewn. The three springs C C and D serve to connect either the one
filament L or the two filaments L L' according as to whether the sliding rod G
and its contact piece H is pushed more or less through the holder in the direction
of the arrow. On pushing the rod G still further both lamp filaments are
disconnected.
By providing as shewn in Fig. 5 another pair of contact springs c and d and
another projection H on the wire G and suitably connecting the leading in wires
of the two filaments to the springs and conductors, the filaments can be connected
either in parallel or series or entirely disconnected according to the position of the
wire G.
Sometimes the cap of the lamp is put into a socket for charging a secondary
battery, in which case the current should not pass through the filament. To
provide for this we make the wire G as shewn in Fig. 6 with a head so placed
relatively to H that when the cap is put into the charging socket which is indicated
by the dotted circle S, the projection H does not reach the end of the spring C and
consequently no current can pass through the filament.
In cases where it is desirable to have a moveable lamp capable of being connected
by flexible conductors with a wall socket or lamp holder it is convenient to have
the adapter in the form of a plug having one or other of the above described
switches fitted in it.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
In combination with the cap and socket of an electrical glow lamp, a rod fitted to
slide or turn therein, and having an insulated projection, which can be made to
bear against springs within the cap making conuections to the leading in wires and

page_text: to the plates which bear against the spring plungers in the socket, substantially as
and for the purpose set forth.
ABEL & IMRAY,
Agents for the Applicants.