Improvements in Holders for Electric Glow Lamps.
Year: 1898

page_text: Date of Application, 16th Feb., 1898
Complete Specification I oft 1 Ath Nov
1000
Maronted 4th Eab
4000
PROVISIONAL SPECIFICATION.
Improvements in Holders for Electric Glow Lamps.
We, WILLIAM GEIPEL, FREDERICK MONTAGUE TOWNSEND LANGE and WILLIAM
ROBERT ROSSI SALTRICK, Electrical Engineers, all of 68, Victoria Street, West-
minster, the latter also of Elmshurst Road, Forest Gate, in the County of Essex,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in electric glow lamp sockets, or holders,
and has for object to improve the insulating properties, and at the same time to
facilitate the method of connecting the terminals of the holder to the leading in
wires. To attain this object we make the base on which the terminals are to be
fixed of pot, vulcanite or other suitable insulating material having a sleeve or
ridge carried above and at right angles with the base and in a direction parallel
with the plungers or contacts. Across the centre of the recess thus formed
between the terminals we provide a partition of insulating material thus dividing
the base into two D shaped cavities into which we fix the terminals & device for
connecting the leading in wires to the lamp. In order to facilitate the connection
of the leading in wires the hole through which this wire is inserted into the base
of the plunger is made at an angle and the binding screw is placed at approxi-
mately right angles to this hole in such a way that the head of the screw clears
the edge of the D cavity. From this it will be seen that the creepage surface,
or in other words the insulating property is greatly increased. While the arrange-
ment of the binding screw facilitates the connection of the holder to the leading
in wires.
We do not bind ourselves to the use of a simple binding screw and in some cases
we may use a wedge, or a screw and wedge combined for making the necessary
contact with the leading in wire.

page_text: of 9, Haydon Park Road, Wimbledon, in the County of Surrey, and late of Elm-
hurst Road, Forest Gate, in the County of Essex, Electrical Engineers, the latter
also of 68, Victoria Street, Westminster, 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 improvements in electric glow-lamp holders, or sockets
and has for object to improve the insulation of the holder, and to render it practi-
cally proof against short circuit, and at the same time to facilitate the method
of connecting the supply wires with the terminals of the holder.
For the purpose of describing this invention we refer to the accompanying
drawings in which:-
-
Fig. 1 is a section of the holder.
Fig. 2 is a section shewing the insulating base together with a plunger and
pinching screw wire grip.
Fig. 3 is a plan of the holder with the outer tube & shade carrier removed.
The base A is made of pot, vulcanite or other insulating material in which there
are two D shaped cavities B. Into these two D shaped cavities are fixed (one
in each cavity) the two plunger sockets, together with the wire-pinching or contact
screws which make up part of the base of the plunger socket. It will therefore
be seen that the only path available for the leakage of electricity is always up
and down the sides of these D shaped cavities, a path which is always compara-
tively long, while it will be readily understood that the two plungers together
with their fixings and accessories, including the bared ends of the wires, are kept
absolutely distinct and separate from each other and from the metallic case.
To facilitate connecting up the holder with the supply wires the base A has
two holes C made in it at an angle, one for each wire. The holes are coned or
funnelled out on the opposite side of the base to that on which the plungers are
fixed. Some of the advantages of this system of drilling the base are:--
(a) By making the holes at an angle as shewn at C (Fig. 2) the stripped ends
of the wires where the insulation resistance is necessarily decreased, are kept a
great distance apart.
(b) The holes being coned out allow some of the insulation on the wire itself
to enter into the high insulation base, and so protect the wires right up to the
connector on contact screw.
(c) The work of threading the wires through the base to the plungers, is reduced
to a minimum.
The screw E is placed at approximately right angles to the holes C, that is,
at such an angle that the head of the screw, and therefore a screwdriver, will clear
the top of the side of the D shaped cavity when held in the normal position for
driving the screw E, but in some cases we may recess the side of the D cavity
in order to give more clearance, or we may alter the angle of the screw E or of
the holes C.
From what has been stated it will be self evident that the creepage surface is
increased to a maximum, or in other words, the insulating properties are greatly
increased, while the arrangement of the binding screw E, by being placed on the
angular hip of the plunger base F together with the angular drilling and opening
out of the holes in the base greatly facilitate the connecting up of the supply wires.
The base A will have the usual grooves along its sides to register the relative
position between the contact plungers and the slots, which are to receive the
bayonets on the sides of the lamp collar or whatever form of connection may be
required. The other details not herein referred to will be made to any of the
usual well known standard patterns.
Having now particularly described & 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) An electric glow-lamp holder having an insulating base formed in one piece

page_text: with two cavities such as described having high sides and a complete dividing
wall, these cavities being for receiving and enclosing the lower portions of the
metal contact plungers and terminals and insulating them from one another and
from the metal socket of the holder substantially as 'described.
(2) An electric glow lamp holder having an insulating base in which are two
cavities with high sides such as specified and in which are fixed the two metal
contact plungers, the said insulating base having holes therein for the supply
wires, the holes being wide apart and funnel shaped at the end for the reception
of the supply wires substantially as described.
(3) The combination of the insulating base having 2 cavities and inclined funnel
shaped holes and the metal contact plungers with inclined terminal screws sub-
stantially as described.
Dated this 16th day of November 1898.
WILLIAM GEIPEL.
FREDERICK MONTAGUE TOWNSHEND LANGE.
WILLIAM ROBERT ROSSI SALTRICK.