Improvements relating to Incandescence Lamps.
Year: 1893

page_text: Date of Application, 20th July, 1893
Complete Specification Left, 23rd Nov., 1893-Accepted, 13th Jan., 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE "GENERAL ELECTRIC Co.," of
620, Atlantic Avenue, Boston, State of Massachusetts, United States of
America.]
Improvements relating to Incandescence Lamps.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention to be as follows:-
This invention relates to incandescence lamps and more specifically lamps of the
kind or class known as "series "lamps which are connected in series with other
lamps and not in parallel or multiple arc across a pair of mains.
The object of my invention is to provide an improved lamp base by means of
which the lamp may be held in a suitable socket and the leading-in wires of the
lamp connected to the leads for the supply of current thereto.
Series lamps are as a general rule supplied with a cut-out which acts to close a
short circuit round the lamp upon rupture of the filament so that other lamps in
series with the defective lamp will not be put out.
The chief feature of this invention relates to the location of the cut-out which
I place upon the lamp base instead of in the socket as has heretofore been the
custom.
According to my invention the bulb of the lamp is seated in the base and
cemented therein by plaster of paris in a well known manner, the two terminals of
the lamp being connected respectively to two concentric rings on the bottom of the
base. The cut-out which is as herein before mentioned located on the base consists
of a spring of copper or other suitable material connected to one of the two
concentric rings on the bottom of the lamp base, and having its tip resting on a
metallic pin connected to the other terminal of the lamp, the said pin being
separated from the spring by a thin piece of paper. When the lamp filament from
any cause is broken, the electrical pressure at the terminals becomes great enough
to break or rupture the said piece of paper so that good contact is made between
the spring and the pin. The lamp is thereby short circuited and other lamps in
series with the same are not put out.
Any suitable form of socket may be used with my improved lamp base, springs
or contact pieces being provided therein which are adapted to make contact with
the concentric rings on the lamp base when the lamp is fixed in the socket.
T
ስለዚ JST.1 1902
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: improvements relating to incandescence Lamps.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents,.
45 Southampton Buildings, in the County of Middlesex, 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 lamps and more specifically to lamps of
the kind or class known as "series " lamps which are connected in series with other
lamps and not in parallel or multiple arc across a pair of mains.
The object of the said invention is to provide an improved lamp-base by means
of which the lamp may be held in a suitable socket and the leading-in wires of the
lamp connected to the leads for the supply of current thereto.
Series lamps are as a general rule supplied with a cut-out which acts to close a
short circuit round the lamp upon rupture of the filament so that other lamps in
series with the defective lamp will not be put out when such rupture occurs.
The
chief feature of this invention relates to the location of the cut-out which is placed
upon the lamp-base instead of in the socket as has heretofore been the custom.
In the accompanying drawing,
Figure shows a lamp-base constructed in accordance with my invention a
portion of the lamp-bulb being shown secured therein.
Figure 2 shows a detail hereinafter described.
A is the lamp-base, B indicates a part of the bulb which is cemented in the
base A by plaster of paris in the usual manner. a a¹ are inner and outer concentric
flat rings formed on the end of the lamp-base and which constitute the contact
pieces of said base. The said concentric rings are effectually insulated from each
other and are connected respectively to the lamp terminals, that is to say, one
ring is connected to one terminal, and the other to the other terminal.
Any suitable form of socket may be used with the above described lamp-base,
springs or contact pieces connected to the leads by which current is supplied to the
lamp being provided therein to make contact with the concentric rings a, a¹ of the
lamp-base when the latter is inserted in the socket. The said springs or contact
pieces are constructed as is usual in such cases to short circuit the lamp when the
lamp-base is withdrawn so that the other lamps in the series will not be put out
by such withdrawal. Any suitable construction of springs or contact pieces may
be employed for this purpose, such device forming no part of the present
invention.
The cut-out which forms the subject of this invention and which is, as herein-
before stated, located on the lamp-base comprises a spring C made of copper or
other suitable metal or material firmly secured to, and in electrical contact with,
one of the concentric rings as for example to the outer ring a' and having its
free tip resting and pressing on a metallic pin D shown in Figure 2 which pin
is in electrical connection with the other ring viz. the ring a, while being insulated
from the ring a¹. The said tip of the spring C is however separated from the
pin D by a thin strip of insulating material preferably paper E, see Figure 2,
which normally insulates the spring from the pin. Should however the lamp
filament from any cause be broken, the electrical pressure between the pin D and
spring becomes great enough to rupture the insulating piece of paper E thereby
establishing good electrical contact between the said spring and pin. The lamp
thereby is short circuited, and the other lamps in series with it are not put out.
I do not confine myself to the shape or configuration of the spring C shown in
the drawing as such may be varied without departing from the nature of my
invention.

page_text: Having now particularly described and ascertained the nature of this said inven
tion and in what manner the same is to be performed as communicated to me by my
foreign correspondents, I declare that what I claim is :-
1. In a lamp-base for a series incandescence lamp, two contact pieces insulated
from each other but connected with the lamp terminals, in combination with a spring
electrically connected with one of said contact pieces and resting on a pin.
electrically connected with the other of said contact pieces, said spring and pin
being separated by a thin strip of insulating material, for the purposes specified.
2. A combined lamp-base and cut-out constructed substantially as described with.
reference to Figure 1 of the drawing, for the purpose specified.
Dated this 23rd day of November 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant..