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Патент USA US3086473

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April 23, 1963
3,086,464
F. E. BUTLER ET AL
DETACHABLE PRACTICE MINE SECTION
Filed July 19. 1960
2 Sheets-Sheet 1
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INVENTORS,
V. G. COSTLEY,F. E. BUTLER,
L. C. LUH,C. W. DOVELL,
D. M. LESLIE
BY
April 23, 1963
E. E. BUTLER ET AL
3,086,464
DETACHABLE PRACTICE MINE SECTION
Filed July 19. 1960
2 Sheets-Sheet 2
FIG.2
INVENTORS.
V. G. COSTLEY, F. E. BUTLER,
L. C. LUH ,C.W.DOVELL,
D. M.LESL|E
BY
-
4
7/9'
ATTORNEYS.
$85,464
Patented Apr. 23, 1963
2
having an anchor section 11 similar, for example, to that
recited in Patent 2,789,503, a mechanism section 12 which
3,086,464
DETACHABLE PRACTECE MH’QE SECTIQN
may be similar to that recited in Patent 2,781,723, and a
drill section 13. The drill section 13 is identical in size
and weight with an explosive section normally utilized
on this mine. Just prior to launching the mine safety
screw‘ 15 is removed. The mine may be laid by ejecting
it from the torpedo tube of a submarine, by air drop or
by various other methods from surface vessels. Upon
Francis E. Butler, Washington, D.C., and (liar-is
Dovell and Donaid M. Leslie, Silver Spring, and ‘Vivian
G. Costley, Takoxna Park, Md, and La Verne C. Lula,
Alexandria, Va., assignors to the United States of Amer
ica as represented by the Secretary of the Navy
Filed .luiy 19, 1960, Ser. No. 43,967
5 Claims. (Cl. 192-16)
(Granted under Title 35, US. (lode (1952), sec. 266)
10 being ejected from a torpedo tube, for example, safety
The invention described herein may be manufactured
rod 16 is thrown off by spring ‘biased hydroswitches 17
and used by or for the Government of the United States
and 2t releasing the switches for operation.
of America for vgovernmental purposes without the pay
The mine drops to the ?oor of the body of water be
ment of any royalties thereon or therefor.
cause of the heavy anchor section 11. One of the hydro
The present invention relates to a drill section to be 15 switches closes at a predetermined depth thereby energiz
used in conjunction with a mine for drill purposes and
ing a clock delay device. After a predetermined delay
more particularly to :a visual signal device ‘for indicating
actuation of the mine.
Broadly speaking, drill mines fall into one of three
nominal categories: dummy, realistic recoverable, and
realistic expendable. The term “realistic” means opera
tionally equivalent or nearly equivalent to a service mine
except without main explosive loading.
The present invention may be utilized in either the
realistic expendable or the realistic recoverable type of
mine. It is very desirable to provide the crews of the sub
marines, surface vessels and airplanes a realistic dummy
period the mechanism section and drill section are re~
leased from the anchor section by the clock mechanism
(not shown but clearly described in Patent 2,789,503).
The mechanism section and the drill section ?oat toward
the surface of the water until stopped by actuation of a
locking mechanism located in the anchor, not shown but
described in Patent 2,789,503 thereby locking the mecha
nism section to the anchor cable.
25
Arming wire 18 shown in FIG. 2 is attached to the
mine for practice in handling, loading and for planting.
anchor and acts as !a cotter pin for spring member 19
which holds the signal cover 20 in place. Release of
the anchor section 11 from the mechanism section 12
It is also desirable to provide a realistic drill mine for
removes arming wire .18 from a hole in bolt 9. Removal
?eet war games to train crews in assembly, planning, lay 30 of arming wire 18 results in spring 19 immediately dis
ing, sweeping and for the general purpose of acquainting
engaging itself from the mine due to the biased position
the ?eet with mine warfare capabilities.
over the signal cover 20. The cover continues to remain
A high degree of realism is required and it is important
in place because of the hydrostatic pressure on the out
that the indication of ?ring of the mine he as dramatic
side of the cover.
35
and impressive as possible.
The mechanism section and the drill section continue to
The present invention overcomes the disadvantages of
rise toward the surface of the water until the locking
the prior art by providing a practice section that will re
mechanism is actuated. The locking mechanism is re
place the explosive section of the mine and which includes
sponsive to a decrease in pressure only. Upon actuation
a signaling device which is operated by the ?ring mecha
of the locking mechanism a locking member not shown
40
nism of the mine.
is actuated in‘ the mechanism section thereby locking the
It is an object of this invention to provide a practice
anchor cable so that the mine sections continue to ?oat
mine section‘ of identical weight as the explosive section
in a submerged state at this predetermined depth.
which it replaces.
The drill section of the mine has an outside casing and
it is another object to provide a practice mine section
hydrostatic switches identical to an explosive section.
that is interchangeable with the explosive section of the
The explosive charge inside the chamber has been re
mine.
placed by a ?oat chamber 22 and a heavy inert material
It is still another object to provide a ?oat to be used
23 for ballast such as cement or other dense material.
with a mine for drill purposes, the ?oat including visual
The ?oat chamber 22 houses a ?oat 24 with a signal
signaling apparatus.
25 located therein. The ?oat has a hook member 26
A further object is to provide a ?oat to be used with 50 held in slot 27 ‘by an explosive bolt 28.
a drill mine in which the signaling element is released
When a vessel passes within lethal range, a magnetom
in response to actuation of the mine ?ring circuit.
eter of the type well known in the art, located in the
Further objects and the entire scope of the invention
mechanism section actuates the ?ring circuit of the mine,
will become more clearly apparent in the following de
55 the ?ring circuit ordinarily used to ?re the detonator en
tailed description and in the appended claims. The ac
ergizes the explosive bolt 28 through adapter cable 32.
companying drawings display the general construction and
operational principles of the invention.
It is to be under
The explosive bolt splits into two parts, one portion being
ejected into cavity 29‘, the other portion being ejected out
through an aperture 30‘ in the housing, thereby allowing
way of illustration and not in limitation, wherein:
water to enter the chamber housing. The explosive bolt
FIG. 1 discloses a plan ‘view, partly in section of the 60 also shears a plastic rod 31 which controls the signal
stood, however, that the drawings are furnished only by
mine and mine anchor;
FIG. 2 discloses a sectional view of the practice mine
energizer.
section;
?oat 24- thereby causing the hydrostatic pressure inside
to be equal to the outside pressure. After the explosive
bolt holding the float is ?red thereby releasing the ?oat
FIG. 3 discloses a detailed sectional view of the arming 65
bar and the release Wire according to one embodiment of
the invention; and
FIG. 4 discloses the ?ring mechanism of the ?oat
signal.
As the water enters the ?oat chamber 22, it surrounds
24, the ?oat spring 33 forces the ?oat against cover mem
ber 20. As the hydrostatic pressures equalize the spring
33 forces the ?oat out of the chamber and the cover mem
Referring now to the drawings, wherein like reference 70 ber 20 falls to one side but is held on the mine for reuse
characters designate like or corresponding parts through- .
by ?exible wire 34-. The ?oat is sufficiently buoyant so
out the several views, there is shown in FIG. 1 a mine
that it rises to the surface of the water.
apsaaea
3
The signal ?oat ‘24 consists of a cylindrical body 35,
The ?oat begins to rise to the surface and the diminish
for example, rubber coated wood to which is attached
with straps 47 on ogive-shaped sheet aluminum cover 36
ing pressure allows the hydrostatically operated ?ring
mechanism to begin operation.
At a shallow depth a
on one end and a ?ange with a hook 26 and shroud ring
37 on the other end. A hole 38 is located axially in the
nose of the cover to emit the ?are and smoke. This hole
spring-loaded ?ring pin is propelled into a percussion
is sealed with a special blow out plug 39. The plug is
removed by a small gas pressure from inside the chamber.
A sinking mechanism 55 for sinking the expended ?oat
pressure is built up in the chamber the blowout plug is
removed. Diminishing pressure also allows the spring
primer in the signal element mounted in the ?oat which
causes ?are and smoke emission.
As soon ‘as a slight gas
to remove the protective cap over the soluble washer. The
consists of a chamber 40 with an ori?ce 41 located on one 10 soluble washer dissolves uncovering a hole for admission
of water into the ?oat chamber to cause it to sink.
side of the signal ?oat which will open after a time de
It can be seen that this device not only provides a real
istic drill mine but that the mine may be disassembled for
lay to the sea water for sinking the signal. The ori?ce 41
is closed with a soluble doughnut-shaped washer 42 which
is held in place by a doughnut-shaped set screw 43. The
storage; for example, the anchor, mechanism compart
sea water enters a hole in the doughnut-shaped set screw 15 ment and the drill section may be stored in separate areas.
The mine mechanism may be tested and maintained
prior to use without the danger of an explosion thus pro
viding a more dependable mine unit.
the sea water enters chamber 40 causing the signal to
Obviously many modi?cations and variations of the
sink to the bottom. While the signal is located in the
mine the ori?ce 41 is covered by a cap 44 which is biased 20 present invention are possible in the light of the above
teachings. It is therefore to be understood that within
by a spring 45-. The cap is removed from the signal ?oat
the scope of the appended claims the invention may be
as soon as the hydrostatic pressure on the cap 44 is less
practiced otherwise than as speci?cally described.
than the pressure of spring 45. As soon as the cap 44
What is claimed as new and desired to ‘be secured by
is removed, the washer 42 is exposed to the sea water
25 Letters Patent of the United States is:
and begins to dissolve.
1. A drill mine for providing realistic training in main
The shroud ring 37 guides the signal ?oat as it ascends
taining, handling and laying of mines comprising a releas
through the water and helps to hold it in an upright posi
able anchor section, a mechanism section having one end
tion after it reaches the surface.
normally attached to said anchor section, a drill section
FIG. 4 discloses the actuating device ‘for the ?oat sig
integrally connected to the other end of said mechanism
nal. The device is held immobile until the plastic rod
section, means located in said anchor section for releas
31 is sheared by the explosive bolt. After the plastic rod
ing said anchor section and mooring said mechanism sec
is sheared the spring member 48 exerts a pressure against
tion and drill section at a predetermined submerged level,
the cup-shaped member 49 and diaphragm 50. The water
detector means located in said mechanism section for gen—
pressure is exerted on the bellows from the outside ap~
erating a voltage signal whenever a ship passes within
proximating the spring pressure. As the ?oat begins to
lethal range of said mine, visual signal means normally
rise the water pressure will be reduced allowing the spring
located in said drill section and released by the voltage
to force the cup-shaped member ‘and bellows away from
actuation of said detector means for providing a visual
pin member 51. As the cup-shaped member 4-9 continues
signal to indicate the operation of the mine.
to move the side portions of member 49‘ move past the
2. ‘The drill mine of claim 1 wherein said drill sec
recesses 54 in member 52 that hold locking balls v53. The 40
tion is interchangeable with an explosive section having
balls 53 normally lock the ?ring pin 51 in a potential ?r
the same size, shape and weight.
ing position. As the side portions of the cup-shaped
3. The drill mine of claim 1 wherein the visual signal
member 49 move past the recess 54 in member 52 the
and washer and slowly dissolves the soluble washer. When
the soluble washer is dissolved ori?ce 41 is opened and
means located in said drill section is a ?oat, an electro
responsive bolt connected to said detector means for nor~
looking balls 53 are cammed out into the space vacated
by member 49 thereby releasing the ?ring pin 51 which
mally holding said ?oat in said drill section, a combusti
is then forcibly driven by spring 48 into a percussion cap‘,
not shown, for setting off a pyrotechnic delay train to the
ble means located in said ?oat which is activated upon
release of said ?oat and provides a visual signal upon
reaching the water surface, whereby said ?oat is released
signal.
The pyrotechnic delay train has a sufficient delay to
allow the ?oat to reach the surface before the main sig
nal is ‘actuated. The signal may be of the kind well
upon actuation of said electroresponsive bolt by said
detector means.
4-. A drill mine for providing realistic training in han
dling, laying and sweeping mines comprising an anchor
known in the art such as a pyrotechnic or a water-reactive
chemical which produces a ?ammable gas, or some other
section having an anchor normally locked therein, a drill
form of display, such as a gas-?lled colored balloon.
If night-time indication is required, some form of 55 section, a mechanism section connected between said an
chor and drill sections, mooring means located in said
‘light or ?ame may be included with the balloon.
anchor section for unlocking the anchor and mooring
Brie?y, the operation of the disclosed drill mine will
the mine at a preset depth, detector means located in said
now be described as follows: a clock mechanism with the
mine is set for the desired time delay and the mine is laid.
A hydrostatic pressure switch starts the clock mechanism
as the mine drops to the ocean ?oor. At the expiration
of the predetermined period of time a switch is closed
‘and the anchor is released. The mechanism section and
drill section are released ‘and the arming wire is removed.
These two sections ?oat toward the surface uncoiling the 65
anchor cable as they go. At another predetermined depth
a counting mechanism located in the anchor actuates a
explosive driver through the electric transmission line. The
explosive driver drives a wedge against the anchor cable
locking it in place. The mine mechanism continues to
?oat at this water depth in the ‘armed position.
If a vessel passes within lethal range the magnetometer
actuates the ?ring circuit of the mine and the ?ring circuit
mechanism section for generating a voltage signal when
a vessel passes within lethal range of the mine, signal
means located in said drill section and responsive to the
voltage signal generated by ‘said detector means for pro
viding a visual indication that the mine has operated, said
drill section of the mine being similar in size, shape and
weight to an explosive section, said signal means in said
drill section including a ?oat chamber, a ?oat, an explo
sive bolt connected to said detector means for normally
holding said ?oat in said ?oat chamber, a container dis
posed in said ?oat, visual means releasably located in
70 said container for producing a visual signal after release
whereby said detector means produces a voltage signal
energizing said explosive bolt thereby releasing said ?oat
and energizing said visual means in said container for
providing a visual signal.
detonates the explosive bolt shearing the plastic rod, ?ood
5. A drill mine for providing realistic training in han
75
ing the chamber and releasing the ?oat.
3,086,464
5
dling, laying and sweeping mines comprising an anchor
section having an anchor normally locked therein, a drill
section, a mechanism section connected between said an
‘signal means in said drill section including a ?oat cham
ber, a ?oat within said ?oat chamber, an explosive bolt
locking said ?oat within said chamber, a visual signal
chor and drill sections, mooring means located in said
anchor section for unlocking the anchor and mooring the
mine at a preset depth, detector means located in said
means including a container in said ?oat for providing a
mechanism section for generating a voltage signal when
the explosive bolt, thereby unlocking the ?oat and ener
a vessel passes within lethal range of the mine, signal
means located in said drill section and responsive to the
gizing said visual signal means.
voltage signal generated by said detector means for pro 10
viding a visual indication that the mine has operated, said
drill section having the same size, shape and weight as
an explosive section interchangeable therewith thereby
providing realistic training in handling of a mine, said
visual signal when the visual signal means is actuated,
whereby said detector means generates a signal exploding
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,706,948
Turlay ______________ __ Apr. 26, 1955
2,775,939
Fogal ________________ __ Jan. 1, 1957
2,949,853
Vogt ________________ __ Aug. 23, 1960
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