Improvements in Wall Sockets for Electric Lighting and like Fittings.
Year: 1896

page_text: Date of Application, 12th Oct., 1896
Complete Specification Left, 12th July, 1897-Accepted, 14th Aug.. 1897
PROVISIONAL SPECIFICATION.
Improvements in Wall Sockets for Electric Lighting and like
Fittings.
I, GUSTAV BYNG, of 69-71 Queen Victoria Street, in the City and County of
London, Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to certain improvements in wall sockets of the type known
as concentric, and has for its object the prevention of short-circuiting the two
contacts of the socket by the insertion of any metallic substance therein through
the open orifice.
In carrying my invention into effect, I interpose between the ring shaped contact
piece, and the central pin, a circular wall of insulating material, so that no action
from outside short of deliberate short-circuiting can occur to the detriment of the
fitting. In the wall plug I dispense with an interposed insulating wall between the
central tube or pin and the concentric outer contact ring, and attach both in such
a manner to the base or foundation that perfect rigidity is attained, independently
of the fact that an open space divides the two contacts as herein before referred to.
I may use any form of socket and plug, preferably making the bases of both of
china or porcelain, and preserving the essential feature of my said invention as
herein set forth.
000
Dated the 9th 3
day
October 1800.
FREDK. WALKER,
73 St. Stephen's Road, Upton Park, London, E., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Wall Sockets for Electric Lighting and like
Fittings.
I, GUSTAV BYNG of 69-71 Queen Victoria Street, in the City and County of
London, Electrical Engineer do hereby declare the nature of this invention and in
what manner the same is to be perforined, to be particularly described and ascertained
in and by the following statement :-
My invention relates to certain improvements in wall sockets, of the type known
as "concentric," and has for its object the prevention of short-circuiting the two
contacts of the socket by the insertion of any metallic or other conducting substance
between them, through the open orifice.
In order that my invention may be clearly understood I have appended the
accompanying sheet of drawings in which Figure 1 is a plan view of the lower face

page_text: of the removable plug, and Figure 2 is a plan of the corresponding socket, with the
cover removed. Figure 3 is a vertical section of the plug aforesaid, and Figure 4 is
a vertical section of the socket, showing the cover in situ. Figure 5 is a plan view
of the upper face of the plug with its cover removed to show the connections.
Similar letters of reference are used to indicate corresponding parts throughout the
several views.
In carrying my invention into effect I employ an insulating base A, which carries
all the connections and contacts forming the socket, and also supports the cover C,
which is also of insulating material. A ring shaped contact piece B is attached to
the base A by a connection plate a with a terininal b fitted thereon. A central pin d
forms the other contact, and a circular wall or annulus of insulating material c is
interposed between said pin and the ring B with a space between both, the whole
being disposed concentrically as shown. Said central pin d and the protective
insulating wall care carried above the ring B as shown by Figure 4, so that no
action from outside the cover short of deliberate short-circuiting can occur to the
detriment of the fitting. The opposite terminal 61 upon the connection plate al is
shown by Figure 2 as coupled to the pin d by a fuse f but a rigid metallic
connection may be substituted therefor. In constructing the wall plug,
Figures 1, 3 and 5, I dispense with the interposed insulating wall or annulus
generally used to divide the inner contact tube E from the outer tube F, and attach
the outer contact ring F to an insulating base G by means of a flange i so that it is
electrically connected to a connection plate h carrying a terminal g. The exterior
surface of F is arranged to fit the interior of the ring B upon the socket which is
split to ensure a free fit with perfect contact. The inner tube E passes through the
substance of the base G and is attached electrically by a screw or equivalent to the
connection plate h¹ carrying the terminal g¹. The interior surface of said tube E
fits upon the pin d upon the socket, and in the action of coupling the plug and
socket, passes between said pin d and the interior space between it and the insulating
wall or annulus c. Upon the base of the plug G, an insulating wall is formed
or affixed thereto, so as to divide the contacts or connections g h and gl h¹.
I prefer to use china or porcelain as an insulating medium, but may in certain
cases use other substances to effect the same purpose. I may also construct a double,
triple or other wall socket, the contacts being made and arranged as described.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is:-
First. In a wall socket and plug the construction and arrangement of the several
parts substantially as, and for, the purposes as herein described with reference to the
drawings.
Second. In a wall socket and plug the construction and arrangement of concentric
contacts with an interposed insulating wall c surmounting the outer contact and
flush with the inner or central contact substantially as herein described with
reference to Figures 2 and 4 of the appended drawings.
Third. In a plug as adapted to a wall socket as referred to in the preceding claims,
the construction, arrangement and connection of concentric contact tubes and
connections upon an insulating base with a dividing wall, substantially as herein
described and shown by the drawings Figures 1, 3, and 5.
Dated this 6th day f T.1. 100
FREDK. WALKER,
73 St. Stephen's Road, Upton Park, London, E., Agent for the Applicant.