An Improvement or Improvements in the Holders or Carriers of Electrical Incandescent or Glow Lamps.
Year: 1892

page_text: Date of Application, 27th Jan., 1892
Complete Specification Left, 28th Sept., 1892-Accepted, 22nd Oct., 1892
PROVISIONAL SPECIFICATION.
An Improvement or Improvements in the Holders or Carriers of
Electrical Incandescent or Glow Lamps.
I, RICHARD George Evered, Director of Evered and Company Limited
Barnet Works Birmingham in the County of Warwick Manufacturers do hereby
declare the nature of this invention to be as follows:-
In the holders or carriers of electrical incandescent or glow lamps as ordinarily
constructed short circuiting or the passage of the electrical current between the
spring pins or rods by which the carbon filament is included in the circuit,
frequently takes place. This arises from the nearness of the said pins to each other.
To prevent this short circuiting a wall or plate of china or other insulating material
has been fixed between the said spring pins. Short circuiting also sometimes takes
place between the said pins and the short metallic tube called the liner in which
the said spring pins are situated.
In order to prevent or minimise both these short circuitings I employ a china or
other insulator of a size and shape suited to fit the said liner. The said insulator
has two parallel holes in which the spring pins are situated, and as the said
insulator surrounds the greater part of the said spring pins and fills the greater part
of the liner the said spring pins are not only effectually insulated from each other
but also from the liner and short circuiting is prevented.
Although I prefer to make the insulators of china I do not limit myself thereto
as they may be made of other insulating materials not injuriously affected by the
heat to which the insulator is exposed.
A tube or band of india rubber or other insulating material may be placed on the
insulator between it and the liner by which tube or band the insulation is made still
more perfect.
Dated the 27th day of January 1892.
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improvement or Improvements in the Holders or Carriers of
Electrical Incandescent or Glow Lamps.
I, RICHARD GEORGE EVERED, Director of Evered and Company Limited,
Barnet Works, Birmingham, in the County of Warwick, Manufacturers do hereby
declare the nature of my invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
In the holders or carriers of electrical incandescent or glow lamps as ordinarily
constructed, short circuiting or the passage of the electrical current between the
spring pins or rods by which the carbon filament is included in the circuit frequently
takes place. This arises from the nearness of the said pins to each other or from
short strands of wire being left in the holder by the fitter up of the lamp. To
prevent this short circuiting a wall or plate of china or other insulating material
has been fixed between the said spring pins. Short circuiting also sometimes takes
place between the said pins and the short metallic tube or case called the liner in
which the said spring pins are situated.
In order to prevent or minimise short circuitings, I employ a china or other
insulator of a size and shape suited to fit and as far as is convenient to fill the said

page_text: liner. The said insulator has two parallel holes in which the spring pins are
situated, and as the said insulator surrounds the greater part of the said spring
pins and fills the greater part of the liner, the said spring pins are not only
effectually insulated from each other but also from the liner and short circuiting is
prevented.
A tube or band of any insulating material may be placed on the insulator
between it and the liner by which tube or band the insulation is made still more
perfect.
I will now proceed to describe with reference to the accompanying drawing the
manner in which my invention is to be performed.
Figure 1 represents in elevation and Figure in vertical section, an electrical
incandescent or glow lamp provided with a holder or carrier constructed according
to my invention;
Figure 3 represents in vertical section and Figure 4 in horizontal section the
short metallic tube or liner and the insulator carrying the spring pins or rods or
terminals drawn to a larger scale;
Figure 5 represents in elevation, the insulator, carrying the spring pins or rods,
detached from the metallic tube or liner and
Figure 6 represents in vertical section and Figure 7 in plan the insulator without
the spring pins or rods, the said section Figure 6 being taken on the dotted line
indicated in Figure 7;
Figure 8 represents in elevation and section one of the spring pins and its wire
binding screw;
Figures 9 and 10 represent in elevation and section the upper part of the metallic
case or liner and the cap of the same with the screw nut and lock nut detached and
Figure 12 represents detached views of the tube or band of insulating material
which is combined with the insulator constituting the principal part of my invention
as hereinafter described;
Figures, 6, 7, 8, 9, 10 and 11 are drawn to the same scale as Figures 3 and 4.
The same letters of reference indicate the same parts in the several figures of the
drawing.
a is the china (or other) insulator of a size and shape suited to fit and be suspended
in the short metallic tube or liner b, a flange a near the top of the insulator a
resting upon the circular seat c at the top of the said tube or liner b and supporting
the said insulator (see Figure 3).
i
In the insulator a are two parallel holes or recesses d, d in which the spring pins,
rods or terminals e, e are situated, the said spring pins or rods being retained in
the said holes or recesses and their movement prevented by the binding screws, f
to which the connecting wires g, y are fixed, passing into the cross recesses h, h
in the insulator a (see Figure 4) the said wires 9, 9 passing through the holes i,
in the insulator on their way to the binding screws f, f. The protruding spring
sliding ends of the spring pins or terminals e, e bear upon the insulated terminals
in the neck of the lamp to which neck terminals the carbon filament in the
globe m is connected as usual. The insulator a is cut away at p opposite each
of the holes or recesses d, d in which the spring pins or terminals e, e are situated
to permit the wires g, g to be connected to the binding screws ff of the said
spring pins or terminals (see Figure 4). The insulator a is prevented from turning
in the metallic tube or liner and the cap q from turning on the tube or liner
by a projecting lip r on the top edge of the tube or liner passing into the recess s
in the flange a² of the insulator a and into a recess in the screwed edge of the
cap 9 (see Figures 3, 5, 7, 9 and 10). The cap q is fixed to the liner or tube 6 by
the screw nut and lock nut u. The globe m containing the carbon filament lis
connected to the bottom of the tube or liner 6 by a bayonet joint fastening as
usual.
The parts described for preventing the turning of the insulator and cap and for
fixing the globe to the bottom of the tube or liner are the same as in ordinary
lamp holders,

page_text: x is a tube or thin band of insulating material sprung over or placed around the
reduced body of the insulator a, either split or unsplit, in the position shown in
Figures 3 and 4 after the wires g, g have been fixed to the binding screws f,f. By
the use of the said tube or band between the principal insulator a and the metal
tube or liner the insulation between the said parts is made very perfect and any
loose strands of wire are insulated from the said outer tube or liner b.
Figure 11 represents in elevation and plan an insulator provided with a single
spring pin rod or terminal to be used with the holders or carriers of electrical
incandescent or glow lamps for ships in which lamps the return current passes
through the outer case or liner of the holder instead of through a parallel spring
pin or terminal and its connecting wire as in the holder of the lamp represented.
The insulator a Figure 11 has a central hole or recess a³ for receiving the spring
pin or terminal e and an oblique hole a through which the wire passes to the binding
screw of the said spring pin nearly half of the insulator at y being cut away to
obtain access to the binding screw f.
By the use of the insulator Figure 11 the central spring pin or terminal is
effectually insulated from the outer metallic tube or liner.
The insulating tube or band a Figures 3, 4 and 5 may be used with the insulator
Figure 11.
Although I prefer to make the insulators a of china I do not limit myself thereto
as they may be made of other insulating materials not injuriously affected by the
heat to which the insulator is exposed.
Having now particularly described and ascertained the nature of my inven-
tion and the manner in which the same is to be performed I declare that I
claim as my invention of "An improvement or improvements in the holders or
carriers of electrical incandescent or glow lamps" :-
First The addition to or combination with the short outer metallic tube or
liner of the holder or carrier of the said lamps of an insulator of china, or other
insulating material, of the kind described and illustrated, in holes or recesses in
which insulator the spring pins, rods or terminals of the lamp are situated and
partly surrounded by the insulator, whereby the said spring pins, rods or terminals
are not only effectually insulated from each other but also from the outer metallic
tube or liner and short circuiting thereby prevented substantially as hereinbefore
described and illustrated in the accompanying drawing.
Secondly-The modified insulator herein before described and illustrated in which
a single spring pin, rod or terminal is axially situated, for effectually insulating it
from the outer metallic tube or liner.
Thirdly-The combination with the insulators claimed in the prior claims of a
tube or band of insulating material, either split or unsplit, sprung or placed outside
the contracted part of the insulator for perfecting the insulation between the
insulator carrying the spring pins or terminals or spring pin or terminal and the
outer metallic tube or liner substantially as herein before described and illustrated
in the accompanying drawing.
De oeth dree of Santambar 1800