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Sept 17, 1946.
'
'
E_ sE|FR|ED
2,407,850
' SUB-AQUEOUS ELECTRIC CUTTING
Filed June 18, 1926
6 Sheets—$heet l
-g'seyraccz,
917663;
Sept. 17,
SUB-AQUEOUS
E_ gElFREED
ELECTRIC CUTTING
.
Filed June is, 1926
"1.1.5
e Sheets-Sheet 2
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Sept 17, 1946-
E. SEIFRIED
2,407,850
SUB-AQUEOUS ELECTRI C CUTTING
Filed June .18, 1926
'
6 Sheets-Sheet 3
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$1663.
Sept. 17', 1946,
E_ SHE-RED.
2,407,850
SUB-AQUEOUS ELEC‘TRIC CUTTING
Filed June‘ 18‘ 1926
6 Sheets-Sheet 6
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Patented Sept. 17, 1946
2,407,850
UNITED STATES PATENT OFFICE
2,407,850
SUBAQUEOUS ELECTRIC CUTTING
Eugen Seifried, Waldkirch in Breisgau, Germany,
assignor to United States of America, as rep
resented by the Secretary of War
Application June 18, 1926, Serial No. 116,926
1'7 Claims. (01. 219——11)
2
1
This invention relates to a new apparatus for
tion of the combined electrode and relay form
clearing mine ?elds, wherein the mine anchor
cables are severed preferably through the in~
similar to Fig. 4.;
strumentality of an electric current.
While hitherto inconvenient and tedious
methods were necessary for locating and severing
in Fig. 14;
mine, that is steel wire, cables under water, this
invention discloses how the cutting may be ac
Fig. 15 shows cross sections of the device shown
Fig. 16 is a view in elevation of a diiferent
form of electrode combined with grapple;
Fig. 17 shows cross sections of Fig. 16;
Fig. 18 is a plan View of Fig. 16;
Fig. 19 is a schematic circuit diagram as used
complished continuously by vessels in movement
without reducing the speed of the latter.
10 in this invention;
While the invention relates particularly to war
operations, for clearing mine ?elds, it may also
Fig. 20 is a modi?cation of the circuit showing
' the use of a reinforcing main relay; and
Fig. 21 is a complete wiring diagram of the
be used for locating and removing wrecks, buoys,
circuit, provided with relays and retarding ar
anchors, etc.
The invention contemplates connecting the 15 rangements;
Fig. 22 is a modi?ed arrangement similar to
vessels used for removing the mines with special
Fig. 20;
search or drag lines which, on making contact
Fig. 23 is a further modi?cation of the com
with the mine cables to be severed, carry them
plete system shown in Fig. 21;
to specially formed electrodes which are dragged
Figs. 24 and 25 are still further modi?cations
along under water by and behind the vessels and 20
respectively of the general arrangement of cir
which electrodes are provided with severing
cuit shown in Fig. 20.
points where the mine cables are subjected to the
. eferring ?rst to Figs. 1 to 3 inclusive, in which
fusing action of an electric current.
The general idea of such a severing method
are shown plan views of Various modi?cations of
may not be entirely novel in theory with respect, 25 the drag or search line assemblages, in each of
these the mine sweeping or clearing vessel is des
for example, to the cutting of metal parts under
ignated by the letter F. In each View the source
water per se. Practical operation of carrying out
of electric energy whether D. C. or A. C. is indi
this general idea, however, involved such great
cated at M and the automatic switching appa
dif?culties that all previous proposals have been
of little value.
30 ratus at A. L indicates the apparatus for pay
ing out and taking up the drag line as desired,
Fig. 1 is one form of the invention, and is a
diagrammatic plan View as applied to a mine
while L1 in Fig. 1, indicates an auxiliary either
mechanical or electrical to be used in conjunc
sweeping vessel;
Fig. 2 is a modi?ed diagrammatic plan View in
tion with L, the purpose of which will be more
clearly explained hereinafter. K indicates the
' which the drag line is secured to the electrode
carrying line;
retaining and guiding devices for the traveling
Fig. 3 is a modi?ed arrangement in which the
drag or search line a, while 3 indicates in cross
drag line and conductors are combined;
section the mine anchor cable which it is desired
Fig.‘ i is a View in elevation of an electrode
to sever. The current carrying conductor leads
combined with an auxiliary relay;
40 to the source of electricity are indicated by b
Fig. 5 is a cross section of the device of Fig. 4:;
and c.
‘
In these views the electrodes are indicated at
Fig. 6 is a plan view of the device of Fig. 4;
E1 and E2.
Fig. 7 is another form in elevation of electrode,
In Fig. 3, a protective net is indicated at N,
which may be similarly suspended from the drag
45 while 92 indicates a- locating or identifying
line;
buoy.
Fig. 8 is a cross section of the device shown in
The operation is as follows: The vessels for
Fig. '7;
locating and removing the mines are sent over
Fig. 9 is a plan view of the device shown in
Fig. 7;
Fig. 10 is a longitudinal sectional view of one
electrode having a star or cruciformed cross sec
tion;
Fig. 11 is a cross section of the electrode shown
the ?eld of operation. Before reaching this lo
cation the complete severing chains and cables,
attached either to the deck or outer sides of the
vessels, are detached from their fastening and
passed into the water by suitable apparatus,
A more
Fig. 12 is a longitudinal sectional view of fur 55 detailed showing of these paying out and taking
up apparatuses is omitted because they di?er ac
ther modification of the electrode of the general
cording to the vessels used and are of construc
star cross section;
tions readily understood by those skilled in the
Fig. 13 is a cross section of the form of elec—
art. These devices are suitably provided with
trode shown in Fig. 12;
Fig. 14 is a longitudinal section of a modi?ca- 60 spring members in order to absorb shocks or
in Fig. 10;
winches or the like, L, over guides K.
2,407,850
3
4
sudden deviations of the vessel and to prevent
injury to the several devices. When several ves
sels are used the cables may be detachably con~
nected together.
When the cables pass out into the water they
connected to it at intervals one each of pairs of
ranged in pairs and instead of projecting be
yond the surface of the drag line, the protecting
housing T surrounding the pairs and the elec
are ?rst suspended with their heavier portion
formed by the electric conductor cables b and c
trodes themselves are provided with notches in
which the mine anchor cable 3 is adapted to slide
with the corresponding electrodes E1 and E2, in
and be held during the severing operation.
electrodes E1 and E2.
These electrodes are ar
The
the form of a downward curve, whereby the ves
active surfaces of the electrodes are shown at 61
sels must observe a relatively favorable distance. 10 and c2. In these forms as in the form illustrated
in Figs. 4-6, the insulation between the conductor
The vessels then slowly advance and the sever—
ing apparatus, supported meanwhile by the level
ing pressure effect of the ?ow on the drag line
and electrode supports, begins to assume a hori
cables and the protecting housing T is shown at
J and J1. Here as in the previous views, the
connecting elements between the parts of the
zontal position, that is substantially parallel to
the surface, whereby the drag line a takes up
the main part of the work.
By reason of its weight the complete severing
device, notwithstanding the ?ow pressure acting
on its surfaces, is suspended at different depths.
rent lead is formed as an insulated cable 0 and
This defect may be remedied if necessary by
known means, for example, by providing the elec
trode housing T with surfaces of different size,
at the center of the curve with greater surfaces
than in the vicinity of the vessels, or by the ar 25
see also
16, 1'7 and 18 showing elevation,
cross section and plan views of the particular
electrode assemblage. The outer current lead
rangement
of
differently
inclined
drag line, are indicated 11..
Fig. 3 shows an arrangement in which one cur
encompassed externally by the other current lead
I), tubularly. The outer current lead b in this
case serves at the same time as drag or search line
a and as a protection for the inner cable lead 0,
together with its connecting coupling members
surfaces,
E2, E2 is not insulated. These connecting mem
bers here are the equivalents of the contact elec
trodes E2 E2 carrying the current over the steel
cable of the search line a. In this arrangement
cables, or by guides, wood fillers, hollow members,
floats and the like, which are suitably weighted. 30 also the protecting housings T, see Figs. 5, i8 ‘and
When the thus substantially horizontally
17, may be provided with control or steering sur
moved severing device strikes an anchored mine
faces and steering bodies g and or, in order to
cable s, seen in Figs. 1 and 2, by reason of the
steer the chains at equal depth and also to in
pendulous freedom or movement of the mine
crease saiety, so that cutting electrodes are on
body and the inclination of the search or drag
the forward side and the claws of the grapples W
engage the steel cable properly.
line a with respect to the moved vessel, said mine
cable 3 slides along the search line and arrives at
‘The search lines a may be held in proper state
one of a pair of electrodes E1 and E2,'connected to
of tension by means of special torpedo-like con
the source of energy M on the vessel through the
trol or steering members or and the position of
current leads b and c. As soon as contact is 4.0 the device is retained by means of the hollow
made with the two electrodes of different polari
elements or buoys g2. In order to prevent the
ties, the mine cable is subjected according to
mines from endangering the vessel the device
the construction of the electrodes as direct or in
should ?rst be adjusted below the keel of the
direct contacts, at least at one point of contact,
vessel and the ?rst severing contact arranged
to the melting or fusing action of the electrical
as far from the boat as possible. Finally, a net
current and ‘burned through. The severing oper
N may be provided at the bow of the vessel for
ation of the electric current proceeds in well
the reception of severed mines.
known manner.
~
In order to be independent of any possible ro~
The ascent of the mine now carries the min
tation and twisting, etc., of the device, further
bodies with the severed retaining cable rapidly
embodiments are shown on Figs. 10, 11, 12 and 13,
to the surface of the water where the mine body
which assure contact of the cables to be severed
is easily visible and where all severed mine bodies
with the electrodes. For this purpose the elec
are collectable by a following vessel or may be
trodes are arranged ‘in star or cruciform shape
directly exploded after their ascent whereby the
on the cables.
route is again opened for other vessels.
According to Fig. 10 the electrodes E’ are at
In Fig. 2 the drag or search line a is provided
tached to the inner insulated cable 0. They are
as a current lead, see corresponding Figs. 4, 5 and
made of one piece together with the connecting
67 which show an elevation, cross section and the
member V which connects the inner cable ends
plan views respectively, of the electrode assem
0, and insulated as a whole, the cutting surfaces
blage.
60 61 being left free. The outer current lead b,
Fig. 5 shows a form in which only the one cur
simultaneously forming a search and drag line
rent lead 0 including its electrode E1 is insulated,
is not insulated, its ends are connected by means
while search line a is used as the other ‘current
of connecting elements D composed of several
whereby these act as rudders, or by various
weights ‘g1, 92, over the length of the connected
lead, together with the coupling members E2,
which here serve simultaneously as current leads
parts and adapted to be screwed together and
which are hollowed out near the cutting elec
and electrodes E2 and the protective housing T,
trodes E1 and serve as current lead electrodes 7E2.
are without insulation. The active cutting sur
The cutting electrodes E1 are here at the same
faces of electrode E1 are designated e1.
time formed as grapple claws W.
Fig. 4 shows an electrical auxiliary apparatus
According to the construction shown in Figs. 12
r q the signi?cance of which will be referred to 70 and 13 the cutting electrodes E1 are also attached
hereinafter.
to the inner insulated cable 0 and formed of one
Figs. '7, 8 ‘and 9 are elevation, cross section and
piece with the members V connecting the cable
plan views respectively of one form of the inven
ends. In this arrangement the ‘grapple cla-Ws W
tion in which the drag line supports both con
are mounted on the connecting element D of the
ductor cables b and 0, each of which cables has 75 outer non-insulated current lead 17 which at the
2,407,850
5
'6
same time serves the carrying function of the
and mounted adjacent the electrodes, see relay
2* of Figs. 4 and 14. If a wire cable slides along
search line a it passes under grapple claw W of
electrode E1, moves armature q from the excited
relay r and thus gives rise to a current impulse
in the A. C. circuit 11 e, see Fig. 19, the solenoid
m is excited, switch S closed and the electrodes
thus connected with the source of energy. The
electrodes now receive current of high intensity
tact line. When contact is made between a mine 10 and the mine cable is severed. The armature q
cable s and the search line it yields by reason of
is now released from the pressure of the mine
the increasing pressure when the vessels are in
cable and returned or drawn back by means of a
motion and is moved back and to such an extent
spring member t and the still excited relay 1‘.
until the wire of the cable moving along the sev
With the return of the complete, magnetic ex
ering lead 0 contacts with a cutting electrode E1, 15 citation of relay 1' the current reception of the
closes the electric circuit and is cut through.
system with the solenoid m connected in series,
After release of the pressure, that is after the
again decreases, switch S is disconnected and the
cutting operation, the search line a returns to its
source of energy separated from the electrodes.
initial position or is moved there mechanically.
The plant is ready for a new cutting operation.
The diagram of Fig. 19 shows the simplest con
The yielding and returning of search line a may '20
cable (1. Also, the individual electrodes E1 and E2
are relatively displaced in order to increase the
cutting action of one electrode.
Fig. 1 shows another arrangement in which an
insulated current lead 0 with cutting electrodes
E1 and a non-insulated independent search line
a, freely movable therebefore, is used as the other
current lead b, preferably designated as a con
be aided by positively actuated auxiliary control
sliding devices L1, whereby this positive movement
struction for automatically connecting and dis
connecting the electrode current, wherein only
is controlled electrically or mechanically by
one main switch need be closed and again opened.
means of an auxiliary line which rapidly ad
Fig. 20 shows a more sensitive arrangement
wherein use is made of an intermediate or rein
vances the contact and search line.
forcing relay m. This arrangement permits
Figs. 14 and 15 are longitudinal and cross-sec
making the solenoid circuit independent and the
tions of details of the current lead 0 formed as
use of any kind of current for exciting solenoid m.
a severing device. The insulation and form of
Relay m is excited through each indicator relay r
electrodes E1 may be such that the backwardly
.
'and forwardly moved search lines a (which at 30 in the same manner as in Fig. 19.
the same time serves the function of the lead 1))
Figs. 24 and 25 show how, by means of a bat
make no contact with the cutting electrodes E1
tery B, direct connection with the electrode leads
themselves and are thus not endangered.
may be made. The relays T are omitted. Relay
The cutting electrodes E1 as well as contact
r2 isexcited through the current impulse result
electrodes E2 may be relatively displaced as de
sired, radially about the axis of the device as well
as axially, with respect to the current lead, in
order to assure engagement with the mine cable
and proper contact therewith.
Fig. 14 also shows an electrical auxiliary relay 40
apparatus described hereinafter.
The modi?cations which may be constructed
are not exhausted by the examples given but may
be evolved or developed according to the object
to be accomplished.
In view of the great conductivity of sea water
and the eventual wear on the electrodes it is pref
erable to connect in the severing current auto
matically only at the instant in which the mine
cable contacts with the electrodes of both polar- '
_ities and then again disconnect these, automati
cally.
A suitable automatic connection or switch ar
rangement is shown in the circuit diagram Fig. 19.
Here 27 c designate the main current leads pass
ing to the electrodes and connected with the com
bined total electrical energy of the vessel prefer
ably to a battery of great capacity. The vessels
may be submarines, torpedo boats, auxiliary cruis~
'ers, battle ships, or special ships. For the electric
current source however, use may be made of fly
wheel transformers, high speed A. C. or D. C. ma
chines.
The characters at 6 represent auxiliary leads
passing to an A. C. source and which extend
independent of the electrode leads but, however,
‘may be installed together with the main leads.
The reference letters r are small relays each with
a movable armature q. The auxiliary leads d 6
ing when the mine cable bridges a pair of elec
trodes E1 ‘and E2. The battery plates of B may
consist, for example, here of aluminum and iron
and form so-called valve rectifying cells, which
are attached to the electrode leads so that when
the switch is closed the potential of the electrode
leads cannot pass current into the auxiliary leads
0!, e.
The valve cells act as a throttle in one
direction of the current while in the opposite
direction current can pass through in known
manner.
Considering now the operation of the circuit
of Fig. 21, at first, the magnetic switch S and
switches 711, $2, 102 are open, relays r1, ‘r2, T3, T4, are
not excited, likewise neither solenoids m, m1. By
closing the circuit over p2 low tension current is
supplied to the A. C. leads (1, e. Thereby
the relay T1 is excited and its armature q1 attract
ed, so that very little current is taken up by the
relay. Relay 12 connected in series with the re
lay is excited at the same time, although the
excitation is not suiiicient to attract the armature
_q2, held by a spring is, contact is still remains
open.
The circuits over m, 191 are then closed, so that
all auxiliary leads of the switch or circuit mecha
nism are closed. Now when grapple claw W of
electrodes E1 (see Fig. 4) engages a mine cable
sliding along the search line a the armature (11
(see Fig. 21) is mechanically removed from relay
T1. The resulting current impulse excites relay
r2, armature qz is attracted and closes the contact
]‘z for relay T3, the latter is excited and armature
qs attracted, whereby contact is is closed and
solenoids m and 1721 are excited.
The circuit S is
~ pass over a solenoid switch m which connects the 70 closed and the vacuum time mechanism Z re
source of electrical energy through suitable safety
devices and contact member S to the electrode
leads b c.
'
leased and drawn up.
Simultaneously with the
attraction of armature (1s a detent 1‘ holds its
outer end so that armature (13 cannot drop back.
Each pair of electrodes may be provided with
The connecting movement of circuit switch. S
such a relay. These are all connected in parallel 75 with contacts f1 and fa attached thereto breaks
2,407,850
7
the. circuit d, c, renders r2 currentless, whereby
armature qz releases and thereby makes relay T3
also currentless. Armature (13, however, is‘ re
tained by the detent f of armature Q4 whereby
contact f3 for solenoid m remains closed.
automatic control movements may be effected ac
cording to Figs. 21 and 23.
-
Furthermore, with respect to the diagram, Fig.
23, with relay r2 attached directly to the electrode
leads by means of leads d1 and c1, aluminum-iron
batteries may be used to throttle the current, in
Through the excitation of solenoid ml the vacorder to prevent injuries, back actions of di?erent
uum time mechanism was actuated and by simul
circuits on each other, as previously mentioned.
taneous removal of contact bridges f4 and f5, relay
Such valve cells are shown in Fig. 25 connected
1'4 and solenoid m1 are rendered currentless. On
termination of the vacuum created in Z, contacts 10 in the leads di and 61 whereby relay T2 is excited
by a ‘current impulse resulting directly by the
f4 and is again close, relay r4 receives current over
bridging of the electrodes by a wire cable.
lead p3 and contacts 14 and JG, armature q4 is at
Since electrical severing under water in gen
tracted, whereby detent J‘ and therewith‘ the un
eral is known it is unnecessary to describe the
excited armature qa are released, current cut off
from solenoid m, switch S opened and the source 15 electrodes in further detail. The insulating
methods are also generally old. The present
of energy out 01f from the electrodes.
case, however, relates to requirements which are
With the disconnecting of switch S contact is
diiiicult to ful?ll by reason of the great mechani
is broken and relay r4 made currentless. At the
cal and electrical strains on the material. It is,
same time contact f1 closes the leads d, e and
therefore, contemplated that use be made of
the indicator relay T1 is again excited. The ap
electrodes sharpened to a cutting edge which are
paratus is ready for a new connecting operation.
completely insulated all around with enamel.
Positioned parallel with relay m is a maximum
The latter material provides sufficient insulating
current relay rs which excites the release relay T4.
protection, is easily broken away at the contact
The detent J‘ with armature 113 is released, contact
with the wire cable so that rapid contact
is is broken, solenoid m rendered currentless and 25 points
takes place, and wears o? uniformly with the
thus switch‘ S at once disconnected, when a cer
electrodes in the severing operation.
tain intensity of current is exceeded.
Use may be made of all conductive materials
The changes of excitation in relay T1 and there
as electrodes, and for the plates of di?erent
by the automatic control of the entire switch or
circuit plant is effected by the mechanical move 30 polarities, different electrodes or electrodes com
posed of different materials may be used.
ment of armature qr through the action of the
What I claim is:
steel cable to be severed.
l. Arrangement ;for clearing mine ?elds by
By directly attaching leads d, c over £11 and 61
moving vessels towing submerged electrodes for
to the main leads b, 0 (see Fig. 23), the bridging
severing the mine cables, comprising a source
of the electrodes by the wire cable itself and the '
of electric energy on one of the vessels, current
resulting current impulse may be utilized for con
leads
extending between the vessels and connect
necting in they apparatus, particularly so when
ing with the said source, a plurality of electrodes
the constantly connected indicator current (D. C.
connected :to and distributed along the current
or A. 0.), which is to be selected of suitable
leads and normally in open circuit relation there
potential, is only of slight magnitude and thus 40 to, adjacent electrode elements being connected
attended with low loss of energy.
to leads of opposite polarity, selected ones of
This applies for a cutting mechanism accord
which electrodes are formed as grappling ele
ing to Fig. 1; normally herein the search line a
ments, whereby the mine cable engaging a cur
is further removed from the cutting electrodes E1. 4 5 rent lead slides along the same due :to the mobil
Consumption by the indicator current thus re
ity of the towed lead until the cable contacts with
mains very slight and the excitation of relay H,
an electrode and is there subjected to the sever
see Fig. 21, may be so adjusted that armature qz
ing action of the source of electric energy, the
is not actuated. However, when search line a
cable completing the circuit through a set of
with mine cable s comes into the vicinity of the 50 electrodes of opposite polarity and through the
electrode E1 there will be a strong current change
said leads.
which suffices with certainty to actuate relay T2
2. Arrangement for clearing mine ?elds by
and therewith put the severing mechanism in
moving vessels towing submerged electrodes for
readiness. The complete diagram of Fig. 21
severing the mine electrodes, comprising a source
shows this circuit and the safety devices (fuses
of electric energy on one of the vessels, current
or the like) provided therein to prevent injuries,
leads extending between the vessels and connect
back action, of individual currents on each other,
ing with the said source, at least one of the said
whether A. C. over D. C. or high over low po
leads being insulated to prevent accidental short
tential.
ing between the leads, a plurality of electrodes
Fig. 1. shows another embodiment for heavy (l O connected to and distributed along the current
search lines far removed from the vessel. In
leads, and normally in open circuit relation
such case use is made of an auxiliary search line
thereto, adjacent electrode elements being con
b which, when the boat travels, is moved in ‘front
nected to leads of opposite polarity, selected ones
of a non-insulated current lead a and an in
of the said electrodes being formed as grappling
sulated current lead 0 therebehind. The aux
elements, whereby the mine cable engaging a
iliary search line is ?rst held back by the mine
current lead slides along the same due to the
cable. These movements of the auxiliary search
mobility of the towed lead until the cable con
line are then imparted directly to the auxiliary
tacts with an electrode and is there subjected to
control mechanism L1, which is actuated elec
the severing action of the source of electric en
trically or mechanically and moves the current 70 ergy, the cable completing the circuit through a
lead a forward and backward.
_
set of electrodes of opposite polarity and through
The movements of the auxiliary search line b
the said leads.
or of the search line a may also be utilized for
3. Arrangement for clearing mine ?elds by
the direct mechanical connection and disconnec
moving vessels towing submerged electrodes for
tion of armature qz of relay r2, whereby other 75 severing the mine cables, comprising a source of
2,407,850
electric energy on one of the vessels, current leads
extending between the vessels and connecting
with the said source, at least one of the said leads
being insulated to prevent accidental shorting
between the leads, the leads being arranged one
10
of opposite polarity, the source of low potential
A. C., being normally connected to selected other
leads and the high potential source being nor
mally disconnecmd from any of the leads, and
means for connecting-in the high potential work
circuit to the leads connected with the electrodes
behind the other, a plurality of electrodes con
as a result of the mine cable-to-be-severed
nected to and distributed along the current leads
changing the current intensity in :the closed low
and normally in open circuit relation thereto,
potential A. C., current before the severing opera
adjacent electrode elements being connected to
leads of opposite polarity, selected ones of the 10 tion, and means operable as an incident to the
action of the ?rst-mentioned means for discon
said electrodes being formed as grappling ele
necting the high potential source from its leads
ments, whereby the mine cable ?rst engages one
after the severing operation is completed.
of the current leads, and in moving this lead
9. A circuit arrangement for mine clearing ap
rearwardly due to its mobility until the cable
paratus with towing submerged electrodes, com
contacts with an electrode on the other leads,
prising a source of high potential and a source of
is theresubiected to the severing action of the
low potential A. 0., current leads-extending be
source of electric energy, the cable completing
the circuit through a set of electrodes of opposite
tween the vessels, selected ones of the said leads
polarity and through the said leads.
4. Arrangement for clearing mine ?elds by
moving vessels towing submerged electrodes for
connecting with the high potential and selected
other leads connecting with the low potential
source, a plurality of electrodes ‘adapted to be
connected to the high potential leads and dis
tributed along the same, adjacent electrodes be
ing connected to leads of oppostie polarity, the
source of low potential A. 0., being normally con
nected to selected other leads and the high poten
tial source being normally disconnected from any
of the leads, and means for connecting-in the
high potential work circuit to the leads connected
severing the mine cables, comprising a source
of electric energy on one of the vessels, current
leads extending between the vessels and connect
ing with the said source, one of said leads being
non-insulated and acting as a tow line, the other
lead being insulated and. arranged directly be
hind the non-insulated lead and connected there
to by retaining members, a plurality of electrodes
connected to and distributed along current leads, 30 with the electrode as a result of the mine cable
and. normally in open circuit relation thereto,
to-be-severed changing the current intensity in
adjacent electrode elements being connected to
the closed A. C., circuit before the severing op
leads of opposite polarity, selected electrodes
eration and for disconnecting the high potential
forming grappling elements, whereby the mine
source from its leads after the severing operation
cable, upon engaging a current lead, slides along
is completed, said means comprising indicator re
the same due to the mobility of the towed leads
lays With spring-biased armatures connected in
until the cable contacts with an electrode and is
parallel in the low potential A. C., circuit at the
there subjected to the severing action of the
electrodes, and a normally open solenoid switch
source of electric current, the cable completing
for the high potential circuit the solenoid of
the circuit through a set of electrodes of opposite 40 which is connected to and is controlled by the
polarity and through the said leads.
high potential A. C., circuit, whereby, before the
5. Arrangement for clearing mine ?elds by
severing operation, the mine cable contacting with
moving vessels towing submerged electrodes for
a pair .of electrodes, by moving the armature of
severing mine cables, as in claim 1 in which the
the associated respective indicator relay causes
electrodes are laterally displaced around and .
the current in the A. C. circuit to be intensi?ed
axially along the respective leads and project
and causes excitation of the solenoid switch to
radially from the periphery thereof.
close the same, and whereby, after the severing
6. Arrangement for clearing mine ?elds by
operation the spring moves the armature of the
moving vessels towing submerged electrodes for
indicating relay to its normal position, resulting
severing mine cables, as in claim 1, wherein the
in throttling the current in the low potential
electrodes are provided with outwardly thickened
A. C., circuit, and in the solenoid, again break
portions facing the adjacent leads and insulated,
ing the circuit between the high potential source
for preventing undesired contact with the leads
and the electrodes.
and whereby the severing surfaces of the elec
10. A circuit arrangement for mine clearing
trodes are protected.
-
apparatus with towing submerged electrodes,
'7. Arrangement ‘for clearing mine ?elds by
comprising a source of high potential and a
moving vessels towing submerged electrodes for
source of low potential A. C., current leads'ex
severing the mine cables, as in claim 1 wherein
tending between the vessels selected leads being
the electrodes are provided with thickened por
connected to the high potential and selected other
tions formed by insulation by means of which (it) leads being connected to the low potential source,
undesired contact is prevented with and the sev
a plurality of electrodes adapted to be connected
ering surfaces of the electrodes are protected and
to the high potential leads and distributed along
which coating of insulation wears off at the same
the same, adjacent electrodes being connected to
rate as the severing surfaces of the electrodes.
leads of opposite polarity, the source of low po
8. Arrangement for clearing min-e ?elds by
tential A. C., being normally connected to cer
moving vessels towing submerged electrodes for
tain other leads and the high potential source
severing mine cables, comprising a source of high
being normally disconnected from any of the
potential and a source of low potential A. C.,
leads, indicator relays with spring-biased arma
current leads extending between the vessels, se
tures connected in parallel in the low potential
lected ones of the said leads connecting with the
A. C., circuit at the electrodes, a reinforcing relay
in series with the indicator relays, and a normally
high potential and selected other leads connect
ing with the low potential source, a plurality of
open solenoid switch for the high potential cir~
electrodes adapted to be connected to the high
cuit the solenoid of which is connected to and
controlled by the low potential A. C., circuit,
potential leads and distributed along the same,
whereby a mine cable upon contacting with the
the adjacent electrodes being connected to leads
2,407,850
11
electrodes by moving the armature of the asso
12
source being normally disconnected from any of
ciated respective indicator relay, thereby destroys
the leads, a relay with a spring-biased armature
the magnetic effect of the latter and produces an
connected in the low potential A. C. current,
increase of current in the low potential A. C., cir
and means whereby a mine cable on contacting
cuit, which excites the amplifying relay and UT with the current leads e?ects the displacement
causes it to control the solenoid switch to open
of the same and actuates the armature of the re
ate the same and to thereby close the high po
lay, and causes the changing of the magnetic ef
tential circuit to the electrodes, and whereby,
foot in the low potential A. C., circuit and means
after the severing operation the spring moves the
responsive to the said last-mentioned means for
armature of the particular indicating relay which 10 causing the connecting in of the high potential
has been operated back to normal position, to
circuit with the electrodes.
cause the restoration of all of the circuits to their
14. Apparatus for removing mine ?elds from
initial condition.
moving vessels comprising trailing submerged
11. A circuit arrangement for mine clearing
electrodes for severing the mine cables and the
apparatus with towed submerged electrodes, com 15 like, a source of electrical energy of large capac_
prising a source of high potential and a source
of low potential A. 0., current leads extending
between the vessels, certain of the leads being
connected to high potential and certain other
leads being connected to the low potential source,
a plurality of electrodes adapted to be connected
ity on one of the vessels, current leads extend
ing from vessel to vessel and connected to the
poles of the said electrical source and to the elec
trodes, adjacent electrodes being connected to
leads of opposite polarity, the electrodes being
distributed about the periphery and length of
to the high potential leads and distributed along
the same, adjacent electrodes being connected to
the current leads and the electrodes of the same
leads of opposite polarity, the source of low po
one of the said current leads being arranged
tential A. C., being normally connected to selected
other leads and the high potential source being
normally disconnected from any of the leads,
indicator relays connected in parallel in the low
potential A. C. circuit at the electrodes for op
eration upon contact of the high potential leads 30
rearwardly of the other whereby upon the mine
cable meeting the front current lead, it will
slide along the same until the mine cable makes
with a mine cable, a normally open solenoid
switch for the high potential circuit, the sole
noid of which switch is connected to and is con
trolled by the low potential A. C. circuit, and a
time limit mechanism operable by the solenoid
switch to determine the duration of the operation
polarity being adapted as grappling elements,
contact with a set of electrodes of dissimilar po
larity, as an incident to the movement of the
vessels, the mine cable closing the electrode cur
rent and being severed as a result of the passage
of the electrode current through the electrodes.
15. Apparatus for clearing mine ?elds by mov
ing vessels towing submerged electrodes for sev
ering the mine cables, comprising a source of
electric energy on one of the vessels, current
of the said switch.
leads extending between the vessels and connect
12. A circuit arrangement for mine clearing de
vices with towing submerged electrodes, com
ed to said source, one of said leads being insu
lated and the other being non-insulated and an
prising a source of high potential and a source
nulariy surrounding the insulated lead, a plu
of low potential A. C. current leads extending
rality of electrodes on and distributed along the
between the vessels, selected leads being connect
current leads and normally in open circuit rela
ed to the high potential and selected other leads
tion thereto, the electrodes on the inner insu
being connected to the low potential source, a
lated current lead passing through insulated
plurality of electrodes being connected to the
openings in the surrounding current leads, and
high potential leads and distributed along the
selected electrodes being formed as grappling
same, adjacent electrodes being connected to
elements, whereby the mine cable, upon engag
leads of opposite polarity, the source of low po
ing the outer lead slides therealong due to the
tential A. C. being normally connected to selected
mobility of the leads until it contacts with elec
‘other leads and the high potential source being 50 trodes of opposite polarity on the current leads
normally disconnected from any of the leads, in
and is subjected to the severing action of the
dicator relays connected in parallel in the low po
source of electric energy.
tential A. C. circuit at the electrodes, for opera
16. An apparatus for clearing mine ?elds by
tion upon contact of the high potential leads with
moving vessels towing submerged electrodes for
a mine cable, a normally open solenoid switch 55 severing the mine cables, comprising a source of
electric current mounted on one of the vessels,
for the high potential circuit, the solenoid of
which is connected to and controlled by the low
‘potential A. C., circuit, and a maximum current
release relay in series relation in the high poten
tial circuit and controlling the energization of 60
the solenoid switch upon rise of current above a
selected value in the said high potential circuit.
13. A circuit arrangement for mine clearing
apparatus with towed submerged electrodes for
severing mine cables, comprising a source of high
potential and a source of low potential A. 0.,
mine grappling apparatus suspended at both
sides of the said vessel, electrically operated sev~
ering apparatus electrically connected with the
said source and attached to the said mine grap
pling apparatus, and means arranged at the out
er end of the severing devices for swinging out
the mine grappling apparatus together with the
severing apparatus on passage of the vessel
through the water.
17. Apparatus for clearing mine fields by mov
ing vessels towing submerged electrodes for sev
ering the mine cables as in claim 1, the elec
trodes having slot~like depressions or cavities
current leads extending between the vessels, se
lected leads being connected to the high potential
and selected other leads being connected to the
low potential source, a plurality of electrodes 71.) constituting the grappling elements for main
adapted to be connected to the high potential
taining the contacting mine cable in severing re
leads and distributed along the same, the source
lation with the electrodes.
of low potential A, C., being normally connected
'
EUGEN SEIFRIED.
to selected other leads and the high potential
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