Protecting Alarm-Circuit. Page: 3 of 4
[1], 3 p. : ill. ; 23 cm.View a full description of this patent.
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591,725
20 and 24 are arranged to operate synchro-
nously and alternately introduce these re-
sistances into the line-circuit. If, therefore,
the distant resistance should not be regularly
5 interposed and withdrawn from the line at
the proper time, or if an attempt should be
made to introduce some other resistance not
precisely the equivalent of the local resist-
ance 25, the equilibrium between electromag-
1o net 13 and the spring 10 would be destroyed
and the alarm set in operation. The same ef-
fect would be produced if any accident should
take place.
The distant pole-changer 24 is actuated by
15 the local pole-changer 20, and in order that
the local pole-changer 20 may produce the
necessary alternations in the circuit 21 22 and
simultaneously cut in and out the local re-
sistance 25 said pole-changer consists, pref-
20 erably, of a permanent magnet 28 and an
electromagnetic armature 30, carrying com-
mutator-plates 30, 31, and 32. Contact-
brushes 33 and 34 bear alternately upon the
plate 29 and upon one of the plates 31 and 32.
25 Now since the wire 21 is connected with the
plate 30 and the wires 22 and 26 are connected,
respectively, with the plates 31 and 32 it is
obvious that the current from battery 18 as
supplied by wires 15 and 17, connected, re-
30 spectively, with brushes 33 and 34, will be
alternated in direction over the distant part
of the line-circuit represented by wires 21
and 22, and simultaneously with these alter-
nations the resistance 25 will be switched in
35 and out. The distant pole-changer 24 com-
prises permanent magnet 35 and electromag-
netic armature 36, included in the line-cir-
cuit, and by means of contact-pins 37 38, con-
nected through the medium of armature 36
40 and outside network 23 with the wire 22, and
the contact-brushes 39 and 40, connected, re-
spectively, with resistance 25, and the wire
21 through medium of inside network 23a,
the resistance 25" is switched in and out in
45 continuous operation. Moreover, from the
position of the parts as shown it will be ob-
served that one of the resistances is switched
in while the other is cut out.
It remains only to provide actuating means
50 for the combined pole-changer and current-
reverser 20. This consists of a clockwork 41
or other equivalent constantly-moving mech-
anism having a vibrating arm 42, which is
connected by a wire 43 with one end of elec-
55 tromagnetic armature 29, the other end of
which is connected by wire 44 with an inter-
mediate point 45 of the battery 5, hereinbe-
fore referred to. Contacts 46 47 are con-
nected by wires 48 49 with the opposite poles
60o of said battery 5. If arm 42 rests in the po-
sition against contact 46,the current from bat-
tery 5 passes to armature 29, which is thereby
made to assume the position in which it is
shown. By said armature the resistance 25
65 is cut out and current is directed from bat-
tery 18 over the line in the direction shown
by featherless arrows, and the pole-changer24 assumes the position in which it is shown
with the resistance 253 switched in. The elec-
tromagnet 13 gains no advantage nor is over- 7o
come by spring 10 and the alarm remains in-
active. When the arm 42 passes to the position
shown by dotted lines, the current is reversed
through armature 29 and passes in the direc-
tion of feathered arrows. The armature is 75
also reversed so as to bring contact-plate 29
beneath brush 34 and plate 32 on brush 33
when the resistance 25 is switched in. The
current is reversed in the direction of feath-
ered arrows over the distant line 21 22. Si- 8o
multaneously armature 36 is shifted and re-
sistance 25a is cut out.
From the foregoing description it will be
understood that as the arm 42 is carried upon
the balance-wheel of a clock mechanism it 85
alternates the current over the circuit 43 44
continuously, and by this means the pole-
changers 20 and 24 are vibrated and the re-
sistances 25 25a alternately introduced and
withdrawn from the line-circuit synchro- 9o
nously and in continuous operation. There-
fore the state of equilibrium of the alarm-
actuating device 13 remains undisturbed;
but as both resistances and pole-changers
must cooperate to maintain this balance it is 95
obvious that any interference with the line
would result in sounding the alarmapparatus.
Having thus described my invention, the
following is what I claim as new therein and
desire to secure by Letters Patent: xco
1. In a device for protecting electric cir-
cuits, the combination of a suitable alarm, an
electromagnetic device controlling said alarm
and arranged to be held normally inoperative
by a current of certain intensity, a circuit o5S
including both the alarm-actuating device
and the distant object to be protected pole-
changers located in said circuit at the station
and at the distant object respectively, resist-
ances adjacent to the respective pole-chang- Io
ers and adapted to be alternately introduced
into the said circuit, and means for actuating
the pole-changers synchronously as and for
the purposes set forth.
2. In a device for protecting electric cir- 1t5
cults, the combination of an alarm or equiva-
lent indicator, a normally open circuit con-
trolling same, a circuit-closer interposed in
said alarm-circuit, an electromagnet com-
bined with said circuit-closer so as to keep 12o
the same normally open but permit it to close
upon a change taking place in the current
passing through said magnet, a line-circuit
including said electromagnet and leading to
the distant point to be protected, a resistance 125
arranged in shunt with said line-circuit, a
pole-changer having a local circuit for actuat-
ing it and combined with the line-circuit in
such manner as to reverse the current there-
through and to simultaneously cut in and out 130
the resistance arranged in shunt therewith,
a pole-changer located at the distant point to
be protected and actuated by alternations on
the line-circuit, and a resistance at said dis-
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Barriclow, Irvin E. Protecting Alarm-Circuit., patent, October 12, 1897; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth174764/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.