Improvements in connection with Electrical Fuses.
Year: 1890

page_text: Date of Application, 26th July, 1890
Complete Specification Left, 25th Apr., 1891-Accepted, 6th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in connection with Electrical Fuses.
REGINALD JOHN JONES of 88 Queen Victoria Street in the City of London
Electrical Engineer & Messrs. WOODHOUSE & RAWSON UNITED LIMITED,
88 Queen Victoria Street, in the City of London, Electric Light Contractors do
hereby declare the nature of this invention to be as follows:-
Our invention is intended to improve the certainty of the action and to simplify
the construction of electrical fuses.
It has long been known that the most efficient method of constructing fuses is to
employ wire of high conductivity and small sectional area, and for this purpose it
has been usual to employ wire produced by the ordinary processes. We find in
practice that more regular results are obtained by using wire which has been
produced by such methods as are used in the process known as the Elmore process,
inasmuch as the chemical constitution, as well as the mechanical properties of the
wire are practically invariable, and consequently the wire exhibits very constant
behaviour under the action of a current. We may use wire composed of any metal
of high conductivity.
We lay this wire in a suitably arranged groove formed in an insulating material,
at the ends of which are clamped suitably shaped metallic pieces to which the wire
is soldered, passing through grooves or slots in the metal so disposed as to protect
the wire from injury. The metal pieces are provided with projections which may
be tongued or slotted in such a way and may be of such a length as to allow them
to be easily attached to the terminals of any arrangement of fusible cut-out.
51 1
1000
REGINALD JOHN JONES.
WOODHOUSE & RAWSON UNITED, LIMITED.
George Worrall, Secretary, pro tem.
COMPLETE SPECIFICATION.
Improvements in connection with Electrical Fuses.
REGINALD JOHN JONES, Electrical Engineer, of 88 Queen Victoria Street,
London E.C. and WOODHOUSE & RAWSON UNITED LIMITED, Electrical
Engineers and Contractors of 88 Queen Victoria Street London E.C. 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 :-
Re invention as intended to improve certainty of action and simplicity of
construction of electrical fuses.
It has long been known that the most efficient method of constructing fuses is
to employ wire of high conductivity and small sectional area, and for this purpose
it has been usual to employ wire produced by the ordinary processes. We find in
practice that more regular results are obtained by using wire which has been
produced by such methods as are used in the process known as the Elmore process,
inasmuch as the chemical constitution as well as the mechanical properties of the
wire are practically invariable, and consequently the wire exhibits very constant
behaviour under the action of the current. We prefer to employ for our purpose
wire which has been drawn cold throughout, as the strength of the wire is greater,
and it is consequently more easily handled. We may use wire composed of any
metal of high conductivity, but we prefer to use copper, as when produced by the
Price 6d.]

page_text: Elmore process its specific conductivity is greater than that of silver produced by
the ordinary process. We lay this wire in a suitably arranged groove formed in an
insulating material, preferably of vulcanised fibre, at the ends of which are clamped
suitably shaped metallic pieces, to which the wire is soldered, passing through
grooves or slots in the metal, so disposed as to protect the wire from injury. The
metal pieces are provided with projections which are tongued or slotted in such a
way and are of such length, as to allow them to be easily attached to the terminals
of any arrangement of receiver or holder for fusible cut-outs.
Figs. 1-12 show four different ways in which we may dispose the wire.
A A' represent the metal pieces or projections, B B the points to which the fuse
wire is attached, C the insulating material, and D the slot in which the wire lies so
as to protect it.
In Fig. 1 it is shown without any groove and in Fig. 10 the groove is shown of
a circular form in order to obtain greater length of wire.
Having thus described the nature of our invention and how the same is to be
carried out, what we claim is :-
(1). In electrical fuses the employment of wire of high conductivity and small
sectional area produced by electro-deposition, a burnisher or its equivalent being
used during the process of deposition.
(2). The combination of the aforesaid quality of wire with the forms of fuse as
shown in Figs. 1 to 12, substantially described and for the purposes set forth.
April 23rd 1891.
REGINALD JOHN JONES.
WOODHOUSE & RAWSON UNITED, LIMITED.
Wm. T. Stutchbury, Secretary.