IMPROVEMENTS IN AND RELATING TO THE HOLDERS OF ELECTRIC LAMPS
Year: 1884

page_text: We CHARLES HENRY GIMINGHAM of Benwell Works, Newcastle on Tyne in the
County of Northumberland, Electrician and JOHN FRANCIS ALBRIGHT of The
Edison and Swan United Electric Light Company Limited, 57 Holborn Viaduct in
the City of London Civil Engineer, do hereby declare the nature of our invention
for "IMPROVEMENTS IN AND RELATING TO THE HOLDERS OF ELECTRIC LAMPS," to
be as follows :—
Our Invention of improvements in and relating to the holders of electric lamps
has reference to an improved combination and arrangement of parts whereby an
incandescent or other electric lamp may be more readily attached to and detached
from its holder whilst at the same time when attached an effective electrical contact
is obtained.
In carrying out our Invention the lamp is connected to the holder by a bayonet
joint the ring of the lamp being provided with two or more pins with which engage
☐ shaped slots in the case of the holder. The two wires from the burner terminate
in two brass or other metal contacts in the base of the lamp, against which abut
two yielding metal contact pins working in sockets and being impelled towards the
mouth of the holder by helical springs. These sockets are carried by segmental or
other suitably shaped pieces insulated from each other and fitted in that end of the
holder which is screwed to its bracket or support, through which end enter the
main conductors, the same being connected to binding screws carried by the respec-
tive pieces bearing the yielding contacts.

page_text: We CHARLES HENRY GIMINGHAM of Benwell Works, Newcastle on Tyne in the
County of Northumberland, Electrician and JOHN FRANCIS ALBRIGHT of The
Edison and Swan United Electric Light Company Limited 57 Holborn Viaduct in
the City of London, Civil Engineer do hereby declare the nature of our invention
for "IMPROVEMENTS IN AND RELATING TO THE HOLDERS OF ELECTRIC LAMPS " and
in what manner the same is to be performed, to be particularly described aud
ascertained in and by the following statement:-
Our Invention of improvements in and relating to the holders of electric lamps,
has reference to an improved combination and arrangement of parts whereby an
incandescent or other electric lamp, may be more readily ttached to and detached
from its holder whilst at the same time when attached an effective electrical contact
is obtained.
In carrying out our Invention, the lamp is connected to the holder by a bayonet
joint, the ring of the lamp being provided with two or more pins with which engage
☐ shaped slots in the case of the holder. The two wires from the burner terminate
in two contacts of brass or other conducting material in the base of the lamp,
against which abut two yielding contact pins of brass or other conducting material
-working in sockets and being impelled towards the mouth of the holder by helical
springs. These sockets are carried by segmental or other suitably shaped pieces of
similar material insulated from each other and fitted in that end of the holder
which is screwed to its bracket or support, through which end enter the main con-
ductors, the same being connected to binding screws carried by the respective pieces
beating the yielding contacts.
And in order that the said Invention may be perfectly understood, we shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the accompanying sheet of drawings, the same letters of
reference indicating corresponding parts in all the figures.
• Figure 1 of the accompanying drawings represents a side elevation of an incan-
descent electric lamp fitted with a holder constructed and arranged according to our
said Invention Figure 2 is a plan of the holder with the lamp removed, and
Figure 3 is a vertical section of the holder and lamp.
A is the holder to which the lamp B is connected by a bayonet joint, the ring a
of the lamp being provided with two or more pins, one of which is shewn at b,
(Figure 1) with which engage a corresponding number of shaped slots, one of
which is represented at c (Figure 1) in the case d of the holder. The two wires 3, 4,
from the burner e terminate in contacts f, g, of brass or other conducting material
in the base h of the lamp against which abut two yielding contact pins i, k, of brass
or other conducting material working in sockets l, m, of similar material and being
impelled upwards or towards the mouth of the holder by helical springs n, n². The
sockets l, m, respectively form part of segmental pieces o, p, secured to a base g of
wood or other non conducting substance so as to be insulated from each other; and

page_text: to binding screws r, s, on the respective segmental pieces o, p, are severally
attached the main conductors 5,-6 which pass through the tubular mounting & pro-
vided with a female screw at u for attachment to a bracket or support.
It will thus be seen that by means of the bayonet joint connection, the lamp may
be readily attached to and detached from its holder, whilst from the arrangement
of the parts of the holder in conjunction with that of the base of the lamp an
effective electrical contact is obtained when the lamp is attached.
Having now particularly described and ascertained. the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
•
1st Connecting electric lamps to their holders by means of bayonet joints sub-
stantially as hereinbefore described.
2nd The combination of a bayonet joint connecting an electric lamp to its holder,
contacts f, g, on the lamp, and yielding contacts i, k, in the holder, arranged and
combined together and in conjunction with the conducting wires, substantially as
and for the purpose herein before described.