Improvements in Electrical Cut-outs.
Year: 1898

page_text: Date of Application, 28th Nov., 1898-Accepted, 25th Feb.,
1899
COMPLETE SPECIFICATION.
Improvements in Electrical Cut-outs.
I, HENRY GEORGE SOLOMON, of 103, Elgin Avenue, Maida Vale, London, W.,
in the County of Middlesex, 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:-
My invention is an improvement in electrical cut-outs, the object being to pro-
vide a simple, cheap and effective construction wherein the shift from a destroyed
fuse to a perfect one is made automatically and immediately on the disruption of
the first fuse.
My invention is primarily intended to protect public buildings, such as theatres,
factories, colleges and the like, also private houses and streets, lighted by elec-
tricity, from being plunged into darkness on the extinction of the lights in the
event of the disruption of a main fuse due to some temporary and momentary
cause, and so provide against discontinuity in supply and the delay caused in
replacing the fuse by hand.
My invention consists of the details of construction which will be described
hereinafter with reference to the accompanying drawings, in which Fig. 1 is an
elevation and Fig. 2 is a plan of the improved cut-out, Fig. 3 and Fig. 4 are
other views, the nature of which will be detailed hereinafter.
Referring to the drawing by letter, a and b are two metal links or arms, made
of copper or gun-metal, or other suitable metal, mounted to rotate, independently
dis a strip or plate
of one another, about the spindle or pin of the casting c.
of brass permanently fastened to a by means of screws, and serves to rigidly con-
nect the links a and b when the pin e is inserted in the holes in d and b as shewn
in Fig. 1, Fig. 2 and Fig. 3. el is the ebonite or wooden handle of the pin e.
f is the main or working fuse connecting the gun-metal or copper block or bar g
with the link band the casting c. f¹ is the second or emergency fuse connecting
the bar g with the contact and fuse block h. ¹ is a small piece of brass or other
suitable metal attached as a shoulder to to form a stop. i is a spring fastened
at one end to the brass piece d and having its other end fastened to any suitable
holder j.
In the elevation, Fig. 1, the spring i is shewn broken for the sake of clearness.
The spring tends to pull the bell-crank arrangement a db round in the direction
of the arrow against the fuse f.
The fuse and contact block h admits of a variety of forms as well as the arm
or link a. The simplest form is shewn in the drawing. The cut-out is shewn in
its normal operative condition in Fig. 1 and Fig. 2, wherein, it will be seen that
the circuit leads from the casting through the link b, fuse f, and through the
bar to the distributing board or boards.
Connection can be made with the cut-out either at the back, as in the drawings,
or in the front.
When the fuse f is destroyed by the passage of an excessive current, the spring i
pulls the bell-crank arrangement a db round and closes the circuit
or arm now being on
again through the second fuse f¹, the link

page_text: the contact block h and prevented from passing over it by means
of the stop . This condition is shewn in Fig. 3, and it will be seen that now the
circuit leads from the casting e through the arm or link a, the contact block h,
the fuse f¹ and through the bar g to the distributing board or boards, also that
the break between and b is increased by the spring action, thus minimising
the risk of the contacts becoming burned by the electric arc which is formed, and
further that the circuit or circuits are protected by the second fuse f.
To replace the fuse f, the pin c is taken out of d and b and b is moved round c¹,
without disturbing a, back into its original position, when a new fuse can be
fixed to b and g as shewn in Fig. 4.
The parallel circuit through the fuse fi can now be broken by moving a off
the contact block h and round until the holes in d and b are over one another,
when the pine can be reinserted, rigidly connecting a and b, and the cut-out
is again in its ordinary operative condition as in Fig. 1 and Fig. 2.
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:
1. In an electrical cut-out the combination of two separate links a and b,
capable of rotating independently of one another round a spindle or pin c¹ and
capable of rigid connection with one another by means of a pin e when inserted
in the hole in and the corresponding hole in the third piece d, the latter per-
manently attached to a, to form when so joined a bell-crank arrangement as
here.nbefore described and illustrated by the accompanying drawings.
2. In an electrical cut-out the combination of a spring to pull the bell-crank
arrangement adb round so as to make contact through the contact and fuse
block, and thus provide a new path through a second fuse f¹, substantially as
described.
Dated this 23rd day of 1 1000