Improvements in Electrical Lamp Holders and similar Electrical Fittings.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in Electrical Lamp Holders and similar Electrical
Fittings.
.
I, GUSTAV BINSWANGER of 71 Queen Victoria Street, in the City and County
of London, Electrician 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 :-
My invention relates to certain improvements in electrical lamp holders, and
similar electrical fittings, in which electrical contact between any two parts is made
and maintained by springs in compression, and has for its object the attainment of
greater simplicity and economy in the manufacture of such articles without
impairing the efficiency thereof.
In order that my said invention may be clearly understood, I have appended the
accompanying sheet of drawings, in which
Figure 1 represents in plan and elevation a spring contact and connecting
terminal, and Figure 2 a plan and elevation of a modification thereof.
Figure 3 is a plan and elevation of a lamp socket base with one of the
modifications, (as shewn detached by Figure 2,) placed in position.
Figure 4 is a plan and sectional elevation of a lamp socket or holder illustrating
the adaptation of the device shewn separately by Figure 1.
Similar letters of reference indicate corresponding parts throughout the several
views.
Two
In carrying my invention into effect I employ volute springs A A¹ as shewn in
the different figures. In Figure 1, said volute spring A is fitted within a socket B
which is bored for the reception of the end of the electrical conductor, a screw C
being fitted for the purpose of properly securing said conductor.
springs A A', thus mounted on sockets B B¹ are fixed by means of screws a a¹
or other means to an insulating base E, arranged to fit the socket F, as in Figure 3.
I may modify this device in the manner shewn by Figure 2, where the base B is
fitted with a terminal D, with a screw C, which serves the double purpose of
holding the socket B in position upon E Figure 3, and also of compressing the
conductor when placed under the terminal D.
I may adopt other methods of and means for connecting the volute springs A A¹
to the insulating base E, and also to the electrical conductors aforesaid, either by
For
direct metallic union, such as soldering or brazing, or by mechanical means.
instance, the hole bored in the socket B to receive the spring A, may be recessed,
and a small projecting tongue or tongues formed upon, or attached to said spring A,
so that it or they may expand when placed in position, and abutting against the
shoulder of the recess, prevent withdrawal, or accidental displacement in a vertical
direction.
Perfect electrical contact is maintained between any two parts, such as a lamp
and socket, whilst the volute springs are in compression, and the device is
applicable to any kind of lamp holder or socket, or any similar electrical fitting.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
First. In electrical lamp holders and similar electric fittings, the employment
of a volute spring or springs for making and maintaining electrical contact
auhotantially an homain decoribed with reference to the drawings.

page_text: Second. In electrical lamp holders and similar electric fittings, the combination
of a volute spring with a terminal or the like for holding an electrical conductor,
substantially as and for the purposes herein described with reference to the
appended drawings.
Dated thie 17th day of July 1891
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant.