Improvements in Holders for Incandescent Electric Lamps.
Year: 1895

page_text: Date of Application, 3rd Aug., 1895
Complete Specification Left, 2nd May, 1896-Accepted, 20th June, 1896
PROVISIONAL SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
We, JAN MEINES HUISMAN, of Mansfield, Leighan Valley Road, Streatham,
and HENRY CHARLES GOVER, of Ivydene, 61 Tierney Road, Streatham Hill,
in the County of Surrey, Gentlemen, do hereby declare the nature of this invention
to be as follows:-
:-
This invention has for its object to simplify and cheapen the manufacture of
holders for incandescent electric lamps, and to facilitate the fixing and wiring of
them.
In the accompanying drawings which illustrate the invention,
Figures 1 and 2 are vertical sections at right angles to each other of a
modification of the improved holder, Figure 1 showing au incandescent lamp
secured thereon.
Figure 3 is an inverted plan of the socket end of the lamp.
Figure 4 is a plan of the improved socket piece to which the lamp end is
secured.
Figure 5 is a vertical section and Figure 6 a plan of a modified form of the
socket piece.
Figures 7, 8, 9 and 10 are views of details of the holder shown at Figures 1 to 4
and bereinafter referred to.
The socket end A of the lamp instead of being formed with the usual flat
contact pieces bearing on spring contacts in the socket is formed with two short
tubes a tapered or slightly turned inwards at the outer end and secured within an
insulating piece, the tubes being connected by wires a¹ to the carbon filament a³ of
the lamp. The holder is composed of an internally screw threaded ferrule B
adapted for attachment, by screwing, to the electrolier, and a socket piece C
secured thereto by a rim or flange on the ferrule which permits of the latter
turning freely. Within the socket piece C is fitted an insulating disc or block D
suitably cut or shaped to hold the contact prongs E which engage with the tubular
contacts a in the lamp. These contact prongs are preferably made from strips e of
metal cut or stamped to the form shown by Figure 7 having projecting ears E
which are bent upwards till they nearly meet as shown at Figure 8 and form on
each strip a double prong resembling a slit tube having considerable resilient
power. A small hole e' in the middle of the strip e is made to coincide with the
axis of the tubular prongs E and through it is entered a small tube f carried
through a block g as shown at Figures 9 and 10 the tube passing up between the
prongs E and terminating at or short of their upper ends.
For the purpose of securing the prong contacts in the insulating disc D the ends
of each stripe are bent around one of the blocks g as shown at Figure 10 the
block placed in a recess cut for it in the disc as shown at Figure 4 and the lower
end of the small tube f expanded or splayed out as shown at Figure 2 in order to
secure the tube to the insulating block D. The leading in wires H are passed one
into each tube f and are secured therein by pinching screws i passed through the
blocks and through slots in the tubes f, the screws thus serving to hold both the
tubes and wires H in place. Access to the pinching screws is obtained through
holes in the socket piece C, shown at Fig. 2.
In fitting the lamp to the holder the socket end is pushed into the socket in
such wise that the tubes a pass over the prongs E which latter being of slightly

page_text: larger diameter than the openings of the tubes are compressed thereby and not
only make good contact but serve to hold the lamp firmly in place. In securing
the holder and lamp to the electrolier the ferrule B is turned independently of the
socket piece and when home it is locked by screwing down the ring J. A nut K
for securing a lamp shade to the holder is provided.
In the modification shown at Figures 5 and 6 instead of providing two independent
contact prongs, a single such prong E is provided and placed centrally or concentric
with the axis of the holder and lamp. One of the leading in wires H is carried
through the tube within the prongs E and is separated from the latter by an
insulating tube and the other is led into a tube f¹ carried through the insulating
disc D and connected to an ear E' formed on the prong E. The socket end of
the lamp has a concentric tube adapted to fit over the prong E and a central piece
to make contact with the tube f.
Dated this 2nd day of August 1895.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
We, JAN MEINES HUISMAN, of Mansfield, Leighan Valley Road, Streatham,
and HENRY CHARLES GOVER, of Ivydene, 61 Tierney Road, Streatham Hill,
in the County of Surrey, Gentlemen, 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 has for its object to simplify and cheapen the manufacture of
holders for incandescent electric lamps, and to facilitate the fixing and wiring of
them.
Referring to the drawings accompanying our Provisional Specification, the socket
end A of the lamp instead of being formed with the usual flat contact pieces
bearing on spring contacts in the socket is formed with two short tubes a tapered
or slightly turned inwards at the outer end and secured within an insulating piece
the tubes being connected by wires a' to the carbon filaments a² of the lamp. The
holder is composed of an internally screw threaded ferrule B adapted for attachment,
by screwing, to the electrolier, and a socket piece C secured thereto by a rim or
flange on the ferrule which permits of the latter turning freely. Within the
socket piece C is fitted an insulating disc or block D suitably cut or shaped to
hold the contact prongs E which engage with the tubular contacts a in the lamp.
These contact prongs are preferably made from strips e of metal cut or stamped to
the form shown by Figure 7 having projecting ears E which are bent upwards till
they nearly meet as shown at Figure 8 and form on each strip a double prong
resembling a slit tube having considerable resilient power. A small hole e' in the
middle of the strip e is made to coincide with the axis of the tubular prongs E and
through it is entered a small tube f carried through a block g as shown at
Figures 9 and 10 the tube f passing up between the prongs E and terminating at
or short of their upper ends.
For the purpose of securing the prong contacts in the insulating disc D the
ends of each strip e are bent around one of the blocks g as shown at Figure 10
the block placed in a recess cut for it in the disc as shown at Figure 4 and the
lower end of the small tube f expanded or splayed out as shown at Figure 2 in
order to secure the tube to the insulating block D. The leading in wires H are
passed one into each tube and are secured therein by pinching screws i passed
through the blocks and through slots in the tubes the screws thus serving to hold

page_text: both the tubes f and wires H in place. Access to the pinching screws i is obtained
through holes in the socket piece C shown at Figure 2.
In fitting the lamp to the holder the socket end is pushed into the socket in
such wise that the tubes a pass over the prongs E which latter being of slightly
larger diameter than the openings of the tubes are compressed thereby and not
only make good contact but serve to hold the lamp firmly in place. In securing
the holder and lamp to the electrolier the ferrule B is turned independently of the
socket piece and when home it is locked by screwing down the ring J. A nut K
for securing a lamp shade to the holder is provided.
In the modification shown at Figures 5 and 6, instead of providing two
independent contact prongs a single such prong E is provided and placed centrally
or concentric with the axis of the holder and lamp. One of the leading in wires H
is carried through the tube f within the prong E and is separated from the latter
by an insulating tube and the other is led into a tube f1 carried through the
insulating disc D and connected to an ear El formed on the prong E. The socket
end of the lamp has a concentric tube adapted to fit over the prong E and a
central piece to make contact with the tube f.
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 :
1. A holder for an incandescent electric lamp, composed of a socket piece moving
freely on a nozzle piece the socket piece having holes giving access to pinching
screws and having a projecting spherical spring prong or prongs adapted for
engagement with tubular contacts on the socket end of the lamp, the said prongs
being suitably formed and secured in an insulating disc in the holder and being in
contact with short tubes to which the leading in wires are secured, substantially as
described.
2. In holders for incandescent electric lamps the improved construction of the
contact pieces made from sheet metal strips cut and stamped to form spherical
spring prongs adapted to engage with tubular contacts in the socket end of the
lamp, substantially as described.
Dated this 1st day of May 1896.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicants.