Improvements in Incandescence Electric Lamp Holders.
Year: 1897

page_text: Date of Application, 3rd Aug., 1897
PROVISIONAL SPECIFICATION.
Improvements in Incandescence Electric Lamp Holders.
We, THOMAS HERBERT MARSH and ALBERT VANDAM, trading as A. Vandam &
Co., of 39, Victoria Street, in the City of Westminster, Electrical Engineers, do
hereby declare the nature of this invention to be as follows:
This invention relates to incandescence electric lamp holders, and it has for its
object to provide, in connection with the socket piece into which the stem of the
lamp is inserted, means whereby the line wires, which are secured to the terminal
pieces inside the socket piece, are prevented from making electric contact with the
said socket piece when formed of metal. According to our invention the socket
piece receives as usual the base of non-conducting material which carries the
spring plungers, or other contact pieces of the socket, with which the contact
pieces on the stem of the lamp come into contact when the lamp is put in place in
the socket, the said base of non-conducting material preferably having a projection
of similar material standing up between the two contact pieces and their binding
screws for each of the line wires s0 ав to obviate danger of the wires
coming into contact with each other inside the socket.- The inner part of
the socket piece or that portion which surrounds the contact pieces on the said
base plate, is lined with insulating material applied to the metal, or separate
therefrom, and conveniently consisting of a ring of glass, earthenware, porcelain
or the like, put in place, (before the base carrying the terminals is put in place)
in the socket and resting against a shoulder formed on, or in, the interior of the
socket piece and held in place between this and the base plate when the parts are
fitted and secured together.
Dated this 2nd day of An1007
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Incandescence Electric Lamp Holders.
We, THOMAS HERBERT MARSH and ALBERT VANDAM, trading as A. Vandam &
Co., of 39, Victoria Street, in the City of Westminster, Electrical Engineers, 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 incandescence electric lamp holders and it has for its
object to provide, in connection with the socket piece into which the stem of the
lamp is inserted, means whereby the line wires, which are secured to the terminal

page_text: pieces inside the socket piece, are prevented from making electric contact with the
said socket piece when formed of metal.
We will describe our invention referring to the accompanying drawings which
shew a lamp holder constructed according to this invention in section in Figure 1
and in plan in Figure 2.
In the lamp holder the socket piece A receives as usual the base B of non-
conducting material which carries the spring plungers C C¹ or other contact pieces
of the socket, with which the contact pieces on the stem of the lamp come into
contact when the lamp is put in place in the socket. The said base B of non-
conducting material preferably has a projection 61 of similar material standing
up between the two contact pieces C C and their binding screws c c¹ for each of
the line wires so as to obviate danger of the wires coming into contact with each
other inside the socket. The inner part of the socket piece A or that portion which
surrounds the contact pieces on the said base B, is lined with insulating material
applied to the metal, or separate therefrom, and conveniently consists, as shewn in
the drawings, of a ring A¹ of glass, earthenware, porcelain or the like, put in place
(before the base B carrying the terminals is put in place) in the socket and resting
against a shoulder a formed on, or in, the interior of the socket piece A and held
in place between this and the base B when the parts are fitted and secured together
by means of a screw ring D which holds a cap piece E against the base B which
latter comes in contact with the insulating ring A¹ and keeps it in position. F is
a screw ring for fixing a shade over the lamp. 68 are holes formed in the base
plate through which the wires are passed to their respective binding screws c c¹.
Instead of forming the insulating ring A¹ separate as aforesaid, the said ring may
be formed in one with the base B, projecting therefrom and constituting a portion
thereof.
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:-
1. In incandescence electric lamp holders the improved means for insulating the
line wires from metal or the like socket pieces consisting of a base piece of non-
conducting material in combination with a lining of insulating material for the
inner part of the said socket piece, substantially as described.
2. An incandescence electric lamp holder constructed in the manner and for the
purpose hereinbefore described and shewn in the accompanying drawings.
11
0
£ 1o 1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.