Year: 1895

page_text: Date of Application, 3rd July, 1895
Complete Specification Left, 4th May, 1896-Accepted, 6th June, 1896
I, CHARLES AMBROSE MCEVOY, of 69 Victoria Street, Westminster, in the
County of Middlesex, Engineer, do hereby declare the nature of this invention to
be as follows:-
Electrical circuit closers have before been made in which an insulated wire has
been passed through one end of a cylindrical casing and the wire held in a clamp
on the inner side of that end and in which another insulated wire has been
passed through a plunger which can be slidden inwards or outwards through the
other end of the casing-the wire being held by a clamp on the inner end of the
plunger.
•
In these circuit closers the plunger is pressed outwards by a spring so that the
circuit is broken but when the plunger is pressed inwards the clamp in which the
end of one wire is held is brought into contact with the clamp in which the other
wire is held and a circuit through the two wires thereby completed.
In order to obtain greater security in the use of circuit closers of this class I
according to my present invention form them with a movable plunger at each end
so that one end of the circuit closer is precisely the same as the other-both
plungers being pressed outwards away from one another by springs so that double
security is obtained as in order to close the circuit both plungers must be pressed
inwards axially towards one another simultaneously.
By making the construction the same at both ends the parts are interchangeable
so rendering the construction cheaper and lessening the number of parts which
have to be kept in readiness for renewal if any should become damaged.
Dated thi
of Tal 100%
I, CHARLES AMBROSE McEvoy, of 69 Victoria Street, Westminster, in the
County of Middlesex, 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:-
Electrical circuit closers have before been made in which an insulated wire has
been passed through one end of a cylindrical casing and the wire held in a clamp
on the inner side of that end and in which another insulated wire has been passed
through a plunger which can be slidden inwards or outwards through the other
end of the casing-the wire being held by a clamp on the inner end of the
plunger.
In these circuit closers the plunger is pressed outwards by a spring so that the
circuit is broken but when the plunger is pressed inwards the clamp in which the
end of one wire is held is brought into contact with the clamp in which the other
wire is held and a circuit through the two wires thereby completed.
In order to obtain greater security in the use of circuit closers of this class
I according to my present invention form them with a movable plunger at each
DQ1

page_text: end so that one end of the circuit closer is precisely the same as the other-both
plungers being pressed outwards away from one another by springs so that double
security is obtained as in order to close the circuit both plungers must be pressed
inwards axially towards one another simultaneously.
By making the construction the same at both ends the parts are interchangeable
so rendering the construction cheaper and lessening the number of parts which
have to be kept in readiness for renewal if any should become damaged.
The drawing hereunto annexed is a longitudinal section of an electrical circuit
closer constructed as above described.
A is a cylindrical casing, B B are end pieces screwed into the ends of the
cylinder. CC are plungers extending through the end pieces. D D are spiral
springs pressing the plungers outwards, E E are collars of ebonite or other non-
conducting material screwed on to the inner ends of the plungers. F F are
insulated conductors passing through the plungers, G G are discs of metal secured
to the ends of the conductors. The discs have two or other number of holes
formed through them-the conductors are made up of several strands-a short
length of each conductor is left projecting beyond the insulation by which the
remainder of the conductor is surrounded the strands of the projecting end are
untwisted some are passed through one hole in a disc G and others through
another hole and the ends are then twisted together and it may be soldered.
These twisted or it may be twisted and soldered ends are as shewn made to lie
in a recess formed in the inner face of the disc. H is a metal cap screwed on to
the ebonite collar E. On its inner side it bears against the twisted wire ends and
nips them tightly between itself and the disc G. "H' is a projection on the inner
end of the cap H forming a contact piece-C are collars around the outer ends
of the plungers C-they limit the extent to which the plungers can be pressed
inwards. The distance between the contact pieces H¹ is made to be greater
than between the collars C¹ and end pieces B so that the contact pieces cannot
be brought together by pressing inwards either one or the other of the
plungers C and can only be brought together if both are pressed inwards
simultaneously.
The whole electrical circuit closer is made of such a length that a person
using it can easily hold it in one hand and press the two plungers inwards
simultaneously by pressing with two fingers against one plunger and with the
thumb against the other.
I is a spring forked safety key which can be made to embrace either one or
other of the plungers C between its collar C¹ and the end piece B near to it.
When one of the plungers is thus embraced by the safety key no end pressure
applied to the plungers can bring the contact pieces together.
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 :-
:-
1. An electrical circuit closer composed of a tubular casing having a plunger
passing into it at each end which plunger is pressed outwards by a spring and has
an insulated conductor passing through it to an insulated contact piece on its
inner end the distance between the contact pieces on the inner ends of the plungers
and the distance that each of the plungers can be pressed inwards being such that
the contact pieces cannot be brought together by the pressing inwards of either
one or other of the plungers but only by the pressing inwards of both simultaneously.
2. An electrical circuit closer constructed substantially as hereinbefore described
and illustrated in the drawing annexed.
Dad
1
1000