Improvements in Fittings for Electric Lamps and their Conductors
Year: 1890

page_text: 5
COMPLETE SPECIFICATION.
Improvements in Fittings for Electric Lamps and their Conductors
I, JOSEPH DEVONPORT FINNEY ANDREWS, of 41 Parliament Street, in the County
of Middlesex, 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 means of readily connecting and disconnecting the parts of
electric lamps and their conductors without requiring skill on the part of the operator
as I shall describe referring to the accompanying drawings.
Figs. 1 and 2 represent in section two parts according to my invention to form a
junction of one line L of insulated conductor to another line L. Within a metal
socket A Fig. 1 I bed the end of the conductor L in cement C, having soldered to
the wire a metallic contact head B.
In like manner, as shewn in Fig. 2, I bed the end of the conductor L' in cement (
in a socket A' having soldered to the wire a helical spring D. On screwing A on
to A compressing the spring D, an effectual conducting junction is made between the
two conductors L L'. As indicated by the dotted lines in Fig. 2, the socket A¹ may
form the base of an electric lamp E, one of the wires of which is scldered to tho
spring D and the other to the metal of the socket.
On screwing the parts A and A' together the lamp wires become connected to the
conductors. In some cases the base of a lamp is arranged to be held in a socket by
a bayonet catch. Fig. 3 shows a junction piece suitable for this purpose.
The socket A is made with a bayonet catch slot on one or on each side to receive
the stud or studs projecting from the base of the lamp. A helical spring D D¹ is held
by a cross pin F in a tube bedded in cement (in the socket.
The junction piece shewn in Fig. 3 being screwed to the socket of Fig. 1; the end
of the spring D makes contact with B, and then the lamp base can be secured by
the bayonet catch in the socket of Fig. 3 its wire making contact with the
spring D'.
Fig. 4 is a section and Fig. 5 a front view of a junction piece such as can be fixed
against a wall for a branch at right angles to the conductor L.
The wire of the conductor L has soldered to it a metal contact piece B which
as well as the end of the conductor is bedded in cement (within the socket A.
A junction piece of the kind shewn in Fig. 2 or in Fig. 3 being screwed into the
mouth of the socket Fig. 4, its spring makes contact with the piece B.
Fig. 6 is a section shewing a junction for a lamp E the swelling base of which is
eld in position by spring arms H. On the base of the lamp is fixed a metal ring K
o which one of the wires of the lamp is soldered, and a spring D insulated from the
ing K is soldered the other lamp wire.
Parts of the ring K are slit into segments G so as to stand out as springs as
hown in Fig. 7.
The end of the conductor L being bedded in cement C within a socket A, on
ringing the lamp E into its place the spring D makes contact with the piece B
Idered to the conducting wire, and the springs & make contact with the metal casing
the socket A.
In the fittings above described I have spoken of cement in which some of the
rts are imbedded. This cement I prefer to be a mixture of sulphate of lime and
mina.
Fig. 8 is a section of a branch joint allowing one of its
nductor L terminates in a metal cap
dered to a
soldered to it.
spring D which is compressed by the cap
ewed in, this button having in it a bed of cement
1.
arms to rotate. The one
The other conductor L' is
when the button mis
which presses against the
n

page_text: The upper socket A which contains the spring D bedded in cement, has a conical
part fitting into the lower socket A' in which it is secured by a nut a.
Fig. 9 is a section and Fig. 10 a side view shewing a bayonet catch for securing
the glass globe M of an electric lamp to the socket piece O from which the globe is
suspended. I make the globe M with an outwardly projecting lip m, under which
I spring a ring N divided at one part of its circumference as indicated in the part
plan Fig. 11. From opposite sides of this ring project two pins P P which enter
into sloping slits formed in the circumference of the socket (. The slits are a little
deepened at their inner ends so that the pins P rest in the hollows without any
tendency to slide down the slope of the slits."
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is:-
1. The combined fittings shewn in Figs. 1 and 2 for connecting conductors for
electric lamps.
2. The fitting shewn in Fig. 3 in combination with that shown in Fig. 1 for
connecting a socket for an electric lamp to a conductor.
3. The wall fitting shewn in Figs. 4 and 5 in combination with that shewn in
Fig. 2 for connecting one part of a conductor to another part at right angles.
4. The wall fitting shewn in Figs. 4 and 5 in combination with that shewn in
Fig. 3 for connecting a conductor to a socket for an electric lamp.
5. The fitting shewn in Figs. 6 and 7 for connecting an electric lamp to a
conductor.
6. The fitting for revolving branch joint shewn in Fig. 8.
7. The bayonet catch fitting shewn in Figs. 9, 10 and 11 for securing the globe of
an electric lamp to its suspending socket.
Dated this 12th day of November 1890.
ABEL & IMRAY,
Agents for the Applicant.