Year: 1897

page_text: Date of Application, 22nd Nov., 1897-Accepted, 15th Jan., 1898
We, GEORG JAEGER and HERMANN BENDER, both of Schalksmühle, 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 lampholder.
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 x-x of Fig. 1,
Fig. 4 is a horizontal section on line yy 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 square
channels b, b provided, leading horizontally almost through the entire thickness
of the insulator and lying parallel to each other, as clearly shown in Fig. 4.
These channels have their mouths at opposite sides of the insulator-circumference.
Two round bores arc, sunk vertically through the insulator, which open into the
said channels b, b. The square terminals c, c¹ being threaded internally at one end
and having provided at their other end hole and screw f for securing the con-
ducting wires, are inserted into the channels b, b', so that the head of the screw f
does not protrude over the circumference of the insulator (Figs. 2 and 4). From
the top of the insulator two plunger-boxes h, h¹, enclosing the spring 7 and the
flanged end of the plunger m, are inserted in the said vertical channels and are
then screwed with their externally threaded lower ends n into the front-end of
the terminals c, c'. The bottomless plunger-boxes h, h have a hexagonal upper
end, which rests in the cut-out portions o, o¹ of the insulator, and an internally
narrowed neck, behind which the plunger is pressed by the spring m, which rests
upon the terminal c, when the plunger end n is screwed into the latter.
All 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 incandescent 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 lampholder are not shown in the drawings,
they being of the well-known "Swan" Lampholder type.

page_text: 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 insulating body a, having
two horizontal, square channels b, 61 and two vertical round bores provided, into
which square channels the terminals c, cl and into which round bores the plunger-
boxes h, h¹ are inserted and within which insulating body the terminal 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, being
externally threaded at its lower end and the square terminal c, being internally
threaded at its front end and having provided hole d and screw f at its other end,
substantially as set forth.
3. In a socket for incandescent lamps in combination the plunger-box h, having
a hexagonal upper end and an internally narrowed neck, and the spring m resting
upon the square terminal c and pressing the flanged end of the plunger 7 behind
the narrowed neck, substantially as described.
Dated this 20th day of November 1897:
GEORG JAEEGER,
HERMANN BENDER.