Improvements in Electric Lamp Holders
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Electric Lamp Holders
I, ALFRED WATSON, of 180, Hockley Street, in the City of Birmingham,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has relation to certain parts of holders for incandescent lamps,
and is an improvement upon or an amplification of the invention described in the
Specification of former Letters Patent granted to me and bearing date the 3rd day of
December 1896 No. 27482, according to which the current is transmitted from
the main or lead wires to the filament contact plates of the lamp without a break
by the employment of flexible conducting wires whose ends were respectively
secured to and in constant electrical connection with the terminals of the lead
wires and sliding and spring-actuated plunger contacts whose outer ends impinged
directly upon the lamp plates.
The object of the present invention is to improve and simplify the construction
of such lamp holders, by making the ends of the flexible conducting wires con-
tact directly with the lamp plates and so arranging the spring plungers that
they act simply as moving agents or carriers for the said flexible conductors
instead of as actual contacts.
In carrying out one form of my invention, I take an insulating body part
provided with separated sinkings or compartments, each of which is fitted with a
terminal plate to which an end of the lead or main wires is connected by a
binding screw or the like. Also secured in a suitable way to this terminal plate
is one end of a flexible or slack conducting wire, which proceeds from the said
plate through a portion of the non-conducting or insulating body part and through
the hollow interior of a sliding carrier sleeve or plunger, a part of which is
surrounded by a spring acting to impel the plunger outwards. The wire extends
through a preferably contracted opening in the lower end of the plunger and
terminates in a knot or other enlargement which, when the lamp is connected to
the holder, impinges against the filament plate of the lamp and is kept in proper
electrical contact therewith by the spring action of its carrier plunger.
It is understood that these flexible conducting and contact wires, with their
carrier sleeves, are employed in duplicate, iz., a pair to each lamp holder respec-
tively in connection with the positive and negative wires.
If necessary, the connection end (as distinct from the contact end) of each
flexible, wire can be brought or threaded through the terminal plate and be secured
by a side screw or the like directly against the lead wire of the holder.
Dated this 23rd day of September 1898

page_text: Improvements in Electric Lamp Holders.
I, ALFRED WATSON, of 180, Hockley Street, in the City of Birmingham,
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:-
:―
This invention has relation to certain parts of holders for incandescent lamps,
and is an improvement upon or an amplification of the invention described in the
Specification of former Letters Patent granted to me and bearing date the 3rd day of
December 1896 No. 27482, according to which the current is transmitted from
the main or lead wires to the filament contact plates of the lamp without a break
by the employment of flexible conducting wires whose ends were respectively
secured to and in constant electrical connection with the terminals of the lead
wires and sliding and spring-actuated plunger contacts whose outer ends impinged
directly upon the lamp plates.
The object of the present invention is to improve and simplify the construction
of such lamp holders, by making the ends of the flexible conducting wires con-
tact directly with the lamp plates and so arranging the spring plungers that
they act simply as moving agents or carriers for the said flexible conductors
instead of as actual contacts.
Figure 1 of the accompanying drawing represents a vertical section of an incan-
descent electric lamp holder constructed according to my present invention.
Figure 2 is a topside plan of the inside of the holder and Figure 3 is a horizontal
section upon the dotted line a, looking upwards.
Figure 4 is a view of one of the lengths of conducting wire employed for making
direct contact with the lamp plates.
Figure 5 is a section of one of the plungers by which the conducting wire is
carried.
Figure 6 represent a plan and a section of one of the terminal plates of the
holder to which one of the leads or cables is connected and from which a conduct-
ing wire passes.
Figure 7 shows one of the springs employed in connection with the plunger for
keeping the outer end of the conducting wire carried by it, in proper contact with
its corresponding lamp plate.
The same letters of reference indicate corresponding parts in the several figures
of the drawing
-
In a lamp holder constructed according to this form of my invention, the
insulating body part a, is provided with separated sinkings or compartments a¹,
each of which is fitted with a terminal plate b, to which an end of the lead or cable
wires is secured and electrically connected by a binding screw c, taking into the
mictal socket c', and clamping the naked end of the said lead within it. Also secured
to this terminal plate in such a manner as to be in electrical connection with it,
is one end d', of a flexible or slack conducting wire d, which proceeds from the
said plate b, through a passage or clearance a², of the non-conducting or insulating
body part and into and through the hollow interior of a sliding carrier sleeve or
plunger e, which is acted upon and impelled outwards by a spring f, disposed in
any convenient manner, such as within the clearance a, between the underside
of the plate b, and the shoulder or abutment el, of the plunger. The wire extends
through a preferably contracted opening e² in the lower end of the said plunger
and terminates in a knot &, or other enlargement which forms a beading for the
end of the plunger to bear against, and when the lamp is connected to the holder,

page_text: impinges against the filament plate of the lamp and is kept in proper electrical
contact therewith by the spring action of its carrier plunger.
It is understood that these flexible conducting and contact wires, with their
carrier sleeves, are employed in duplicate, viz., a pair to each lamp holder respec-
tively in connection with the positive and negative wires.
If necessary, the connection end (as distinct from the contact end) of each
flexible wire can be brought or threaded through the terminal plate and be
secured by a side screw or the like directly against the lead wire of the holder.
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:-
In electric lamp holders, the employment of flexible conducting wires each
having one end in electrical connection with a lead wire or cable whilst the
other end is adapted to contact directly with the filament plate of a lamp and be
kept in such contact by a spring plunger or its equivalent which acts as a carrier,
substantially as described and set forth.
D
03 1 1
1000
ALFRED WATSON.
By Henry Skerrett,
24, Temple Row, Birmingham,
Agent for Applicant.