Improvements in Electric Lampholders and Connectors.
Year: 1897

page_text: Date of Application, 5th Apr., 1897
Complete Specification Loft 4th Jan 1800 Accented 5th Man 1000
PROVISIONAL SPECIFICATION.
Improvements in Electric Lampholders and Connectors.
VERITYS LIMITED, of Plume Works, Aston, in the County of Warwickshire,
and MORTON BLENCOWE COTTERELL, also of Plume Works, Aston, in the County of
Warwickshire, Electrical Engineers, do hereby declare the nature of this invention
to be as follows:-
The object of this invention is to provide an improved interior for electric lamp-
holders, sockets, or connectors whereby increased insulation is obtained and a
cheaper mode of manufacture rendered possible.
In our invention we use an insulating block of china or other suitable material,
cylindrical in shape, with the exception of a pair of apertures which extend partly
through the block in a horizontal direction from the opposite ends of the diameter,
and also a second pair of apertures pierced from one end in a vertical direction in
such a manner as to meet the horizontal apertures. Through the latter are inserted
two metal plates carrying the terminals, and through the vertical apertures are
inserted two tubes or containers. In the case of a lampholder these contain the
plungers and plunger springs and are arranged to screw into or to be otherwise
attached to the metal plates before mentioned. In this manner by firmly fixing,
screwing, or attaching the tubes or containers to the metal plates a firm mechanical
fixing is obtained for all the parts concerned.
Great simplicity is achieved and a high state of electrical efficiency ensured.
Dated this and do..
100%
Improvements in Electric Lampholders and Connectors.
We, VERITYS LIMITED, of Plume Works, Aston, in the County of Warwick,
and MORTON BLENCOWE COTTERELL, also of Plume Works, aforesaid, Electrical
Engineer, 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;-
-
The object of this invention is to provide an improved and simple interior for

page_text: electric lamp-holders, sockets, or connectors, whereby increased insulation between
opposite poles and a high state of electrical efficiency are obtained and a cheaper
mode of manufacture rendered possible.
We will describe the invention with reference to the accompanying drawings
as applied to an electric lamp holder from which its application to connectors
generally (such for example as wall plugs) will also be understood. Figure 1 shews
the improved interior in side elevation. Figures 2 and 3 are sections of the body
part of insulating material, the section, Figure 2, being taken on the line 1--2
Figure 1, and the section Figure 3 being taken on the line 3-4 Figure 1. Figure 4
represents in elevation and plan one of the metal plates carrying the terminals.
Figure 5 shews in elevation and section one of the tubes or containers and Figure 6
shews in section one of the plungers with the plunger spring therein. Figure 7
shews in section a device according to this invention in place in a lamp socket with
the wires connected by the terminal screws.
A is a cylindrical insulating block of china or other suitable material, having
therein apertures a² a extending partly through the said block from opposite sides
of the diameter, that is to say, in a horizontal direction when the device is in
the position shewn. The part a³ extends farther inwards than does the part a²
Apertures a are pierced through the block A from one end (that is in a vertical
direction when the device is in the position shewn) so that the said apertures a
open into the part a³ of each of the aforesaid horizontal apertures. Into the aper-
tures a as the terminal pieces are inserted they each consisting of a metal plate B
carrying terminals & perforated at 62 for the reception of the lead wires and provided
with screws 63 for securing the said wires. The portions a³ of the recesses a² a³
receive the terminals b whilst the portions a³ of the said recesses accommodate the
projecting part of the plate B containing the holes b. The said perforations be
are in line with holes in the block A through which holes as the lead wires are
passed. Through each of the apertures at a tube or container C is passed and
secured each to one of the plates B by a screw on the tube or container screwing
into a screwed hole 64 in the plate B. This tube or container therefore constitutes
a screwed cylinder which (instead of pinching the insulating material between it
and the plate B as would be the case with a screw having a head or nut) passes
right through the plate B and presses against the surface a at its rear and so
draws the plate B against the surface as opposite to it. Each of said tubes or
containers C carries a plunger D formed with a shoulder d for bearing on the
shoulder c of the tube or container C to retain the plunger in place. E is the spring
contained in each plunger D and bearing against its internal end and against the
block A. In Figure 7 the device is shewn held in place between the parts F of a
lamp socket. It may be combined with any other convenient form of connector.
In the aforesaid manner a firm and ready connecting of the metal fittings in the
block A is secured and, as the terminals are entirely separated by the intervening
parts of the block A, there is no danger of short circuiting.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we declare that what we
claim is:
-
1. An interior for electric lamp-holders, or connectors, consisting of the combina-
tion of parts formed, or constructed, and connected together, substantially as
hereinbefore described.
2. In, or for, electric lamp-holders, or connectors, a block such as A, formed
with recesses, or apertures, a² a³ penetrating from the sides and containing the
terminal plates and terminals, and provided with apertures, or holes, at right angles
to the recesses, or apertures, a³ a³, penetrating the block A into the said recesses from
opposite sides respectively for the passage of the lead wires into the terminals, and
of the plunger carrying devices, or the like, for connection to the terminal plates
substantially as hereinbefore described.
3. In, or for, electric lamp-holders, or connectors of the character herein before

page_text: described and claimed, fixing a plate such as B, in place by means of a screwed
cylinder or the like, which by bearing on an opposed surface effects the fixing of
the plate, substantially as herein before described.
Dated this 4th day of January 1898.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.