Improvements in Holders for Incandescent Electric Lamps.
Year: 1897

page_text: Date of Application, 22nd Nov., 1897 -Accepted, 15th Jan, 1898
COMPLETE SPECIFICATION.
Improvements in Holders for Incandescent Electric Lamps.
We, GEORG JAEGER and HERMANN BENDER, both of Schalksmuhle, Westfalen,
Germany, Manufacturers, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:
This invention relates to a compact construction of socket to receive the base of
an incandescent lamp, wherein, with the exception of the protruding plungers, all
the metallic parts are imbedded in the insulator, thereby absolutely preventing
short circuiting by a too far introduction of the leading-in wires, or by the
terminals coming in contact with other metallic fittings of the lamp holder.
In order to make our invention more easily understood we have illustrated it
on the accompanying sheet of drawings of which
Fig. 1 is a top view,
Fig. 2 is a side view,
Fig. 3 is a vertical section on line of Fig. 1,
Fig. 4 is a horizontal section on line y-y of Fig. 2,
Fig. 5 is a vertical and longitudinal section of a terminal with a plunger in
elevation.
The insulator a of ceramic or other suitable insulating material has two round
bores b, b provided, penetrating horizontally almost through the entire thickness
of the insulator and lying parallel to each other as is clearly shown in Fig. 4.
These bores have their mouths at opposite sides of the insulator-circumference.
Two similar bores are sunk vertically through the insulator, which open into the
said bores b, bl. The terminals c, c¹, being internally threaded at their semi-
circular shaped front-end and having at their other end a hole d and screw f pro-
vided for securing the conducting wires, are inserted into the bores b, 61, so that
the head of the screw f does not protrude over the circumference of the insulator
(see Figs. 2 and 4). From the top of the insulator two plunger boxes h, h¹, being
provided at their upper extremities with a narrowed neck and holding enclosed the
spring and the flanged end of the plunger m, are inserted in the said vertical
bores and are then screwed with their screw ends g, g' into the internally threaded
front-end of the terminals c, c'. The metal parts being charged with current of
opposite polarity are thus insulated from each other in the most perfect manner,
which allows of these sockets being used for the highest voltage used in incan-
descent lighting. In the base of the insulator two small holes are provided for the
introduction of the leading-in wires. The external brass fittings of the lamp-
holder are not shown in the drawings, as they present nothing new over the well-
known Swan" Lampholder.
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 socket for incandescent lamps consisting of an insulator a, having two
horizontal bores 6, 6' and two vertical bores provided, into which horizontal bores

page_text: the terminals and into which vertical bores the plunger-boxes are inserted and
within which insulator the terminals and the plunger-boxes are connected by the
latter screwing into the former, substantially as described.
2. In a socket for incandescent lamps in combination the plunger-box h, having
a threaded end g, and the terminal c, being internally threaded at its semi-circular
shaped front-end and having a hole d and screw f at the other circular shaped end,
substantially as set forth.
3. In a socket for incandescent lamps in combination the plunger-box h, having
a threaded end g and a narrowed neck, and the spring pressing the flanged end
of the plunger m against the narrowed neck within the plunger-box, substantially
as described.
0011
BT
100%
GEORGE JAEEGER,
HERMANN BENDER.