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Патент USA US2405990

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~ '
m; 20, 1946.
Filed May_22, 1943
27 '27
Patented Aug. 20, 1946
John T. Beechlyn, Worcester, Mass., assignor to
Submarine Signal Company, Boston, Mass, a
corporation of Maine
Application May 22, 1943, Serial N0. 488,320
4 Claims.
(01. 116-26)
The present invention relates to means and
method of locating submerged objects and is more
particularly applicable for military purposes in
locating the position of enemy submarines.
While the present sound ranging methods are
usefully employed for this purpose and are able
to locate a submarine and provide bearings and
distance measurements so that they may be
suitable device in such a manner that they shower
down substantially simultaneously over a given
chosen area. These missiles upon reaching the
water substantially at the same time sink verti
cally at a constant rate until they come in con
tactwith a submerged object, or the bottom.
When they strike a submerged object, the lower
or weighted part of the missiles are released and
what is left shoots rapidly vertically upward to
tracked down, some uncertainty and confusion
the surface, popping out of the water for a con
still exists when the searching vessel comes into
siderable height. Various means may be used to
the near vicinity of the submarine in a radius
make the missiles more noticeable when they
perhaps of 50 to 250 yards and over the area
break through the water surface. They may be
where the submarine is at the observing moment.
painted with a bright color or provided with some
In this range when the surface vessel is closing in
special re?ecting means, or they even may
on the submarine, skillful maneuvering of the
provide a loud explosion. The buoyancy of the
submarine may make it difficult or even impossi
missiles may be so adjusted that they sink at one
ble to obtain bearings from the searching surface
rate and rise at the same or a different rate. In.
vessel. The surface vessel in this case must con
any event, the rates of sinking and rising Will be
tend not only with a great maneuvering ability of
known and from a measurement of the time in
the submarine under these conditions, but also 20 terval between the missiles hitting the water and
with the fact that the submarine has a three di
until they again reappear will give a measure
mensional maneuverability providing theoreti
ment of the submerged object. In most cases,
cally at least in?nite possibilities of escape.
since the water depth will be known, there will be
The applicant has devised a method and means
no confusion between those which come to the
whereby the depth and position of the submarine
surface from the bottom, and those which come
at this time of the search may be observed and
to the surface from a submerged object. In Fig.
followed. The means of the present invention
avoid the necessity of using sound waves which is
at times a distinct advantage especially when the
1. the missile is generally indicated by I. This
includes an evacuated air ?lled body 2 having
30 generally a stream-lined shape so that the resist
submarines are in groups or when they are at
ance of the body to the Water is low, and constant.
tacking a convoy or more than one vessel. Under
The body 2 may be made of glass, thin metal,
these conditions, the water noises 0r noises from
plastic, or other suitable material, which is not
the various vessels in the vicinity may be very
readily shatterable under the conditions under
confusing and interfere with e?icient sound rang
which the device is used. The body 2 may at its
ing as also may be the case after the water me 35 end be lightly loaded with a metallic cap, 4', hav
dium has been disturbed by the explosion of depth
ing directive ?ns 4, 4, 4, 4 positioned at right
charges or other explosive attacking means. The
angles to each other at the end of the body. .The
invention will be more readily and fully under
body may also be provided with a tail projection
stood from a consideration of the speci?cation set
5, cylindrical in shape, with an annular recess 6
forth below describing the invention when taken
in which the latch member ‘I normally rests. The
in connection with the drawing illustrating the
latch member ‘I is mounted in the ' weighted
same in which Fig. 1 shows an elevation partly in
stream-lined body 8, which abuts the exterior side
fragmentary section of a part of the invention.
walls of the stream-lined body 2. This weighted
Fig. 2 shows a modi?cation in fragmentary sec
body which has a stream-lined outer contour, is
tion of a portion of the device corresponding in
provided with a centrally symmetrically bore or
the drawing to Fig. 1. Fig. 3 shows a section
hole 9 in which the projection 5 from the tail of
taken on the line 3—-3 of Fig. 1. Fig. 4 shows in
the body 2 is positioned. The bore 9 extends 1on
elevation a device by which the structure of Fig. 1
git-udinally through the tail end In of the body 8
is ?red.
Fig. 5 shows a view as seen in the direc
and in it is ?tted for free motion a rod or shaft
tion 5—-5 of Fig. 4 and Fig. 6 illustrates schemati 50 I I. The body 8 in the end portion I0 is also pro
cally the method by which the missiles of Fig. 1
vided with a recessed portion l2 exposed or re
are directed in a pattern over. a given water
In the present invention a group of missiles
of a special construction are projected from a
cessed as far as the shaft H. The latch 1 previ
ously mentioned is formed‘as a part of a ?at
pivoted member [3, pivoted in the body ID by
means of the shaft M. This pivoted element I3
is tensioned by means of a spring l5 which latch
es a projection l6 of the element l3 in a recess [1
of the shaft II and similarly latches the latch 1
against the collar I8 at the end of the tail pro
jection '5. The member I3 provides an inertia
feet. In the arrangement indicated in Fig. 2,
the wall 3| of the missile may be made of some
transparent material such as glass or some trans
parent plastic and may in the inside be pro
vided with trihedral re?ecting surfaces 32, 33,
34 which will re?ect backwards any light im
pinging upon it. At night when the missiles
could not otherwise be seen, a low ?ood light
of the missile' Ports 50, 5D, 50 are'provided in
the wall 8 to permit the free entry of water as the 10 may be used extending over the vicinity of the
. water surface of suflicient intensity 'to illuminate
two parts of the missile separate.
the re?ecting surfaces 32, 33, 34, so that they
The missile described in Fig. 1 may be pro-‘
may be visible from the searching vessel when
pelled from a projector 20 mounted on a deck 2|
they have broken through the water after coming
of a vessel. The missiles ‘are'balanced to fall
straight down in the water ‘and/upon the end 15 in contact with the submerged body or sub
place of or in addition to the re
of the pin II striking the submarine, the body 2
balance counterpoising the inertia of pin II so
that a dynamic balance exists during acceleration
is released and travels straight up to the surface. '
so that the position at which it reappears is ver-_
fle'cting surfaces 32, 33, 34, which may extend
. in a belt around ‘the missile element an explosive
device 35 may be used. This explosive device
tically above the point at which it struck the sub‘
may be formed ‘as a portion of the nose of
marine. A convenient method for this is indi 20
the missile 36 and may comprise a hood 31 pro
cated in Fig. ‘4 which shows a compressed air or
vided with an internal annular shoulder 38
gas supply 22 which feeds a cylindrical valve 23-.
‘against which a' helical spring 39 bears. > The hood
The cylindrical valve 23 has a rotor element 25
m may be cemented with a soluble cement to a
into which’ the compressed air from the supply
source 22 is fed. The rotor 25 is provided with a 25 collar 40 extending over the joint between the
hood 31 and the body 3! of the missile 36. This
longitudinal port 24 and when the handle 25 is
‘collar 40 ?ts over the increasing stream-lined
turned rotating the rotor 25, the longitudinal port
wall‘formed by the nose of the missile and the
opens successively to groups of projector tubes 21,
body portion of the missile itself and is at the
28, 29, 3!]. As indicated in Fig. 4 a number of
‘tubes are provided in the same plane as shown 30 same time cemented both to the .hood andto
the body portion’ of the missile .by a soluble
by 21,21, etc. The vindividual tubes in any one
cement as mentioned so that after the device
plane flare out at slightly different angles and
gets into the'water it will gradually be loosened
each group is spaced in a fanned-out position
with respect to the other groups whereby a given
after a time interval. The helical spring 39
chosen area is covered over‘ which the missiles 35 bears against a partition 4| located between the
will drop. By shooting or projecting each one
nose and the rest of the body portion of the mis
of the missiles with the same Vertical velocity
sile so that the head is tensioned ‘awayfrom the
component, the missiles will reach the same ver
rest of the body by the spring at all times. Cen
tical height “h,” as indicated in Fig. 6, and will
trally, under the spring is located an explosive
fall at different points into the water all at sub 40 element 43 which may be ignited by a cap mem
stantially the same time. The vertical velocity,
ber 44 suspended'between .the end 45 of the
component of the missiles may be controlled by
nose and a well 46 in the plate 42. While the
properly proportioning the end openings in the
missile in Fig. 2 is in the water either the cement
tubes or by any other suitable means for instance,
has not been su?iciently loosened or the pressure
‘if the missiles are ?red by explosive charges, 45 of the water on the shaft 40 is such so that the
the size of the charges may be varied to produce
the desired velocities so that their vertical com‘
ponents are. maintained constant. It naturally
follows from the description just given that if
top nose 31 will remain inplace. When, how
ever, the missile has shot out of the water, the
spring 39 will force the nose away from the rest
of the’body igniting the cap~43 and exploding
the angle of direction of the missiles are all the 50 a powder 44 causing a detonation and a visible
same, then equal muzzle velocities will provide
light which maybe seen'within the range that
substantially the same kind of dropping to the
the device is, used. In' this manner the‘ device
water surface. It is of course noted that varia—
may have use both for day-light and night search
tions in wind velocity and direction may have
anv e?ect upon these factors, but in general, this 55 ing and attack'and may be used "as initially de
scribed in hunting and tracking down submarines.
effect may be neglected since in general all mis
Having now described my invention, I claim: '
siles will go in the same direction ‘and all fall
1'. A method of ~spotting submerged submarines
The operator may
‘with a projectile having a negative buoyancy
time missiles either‘lfrom- the ?ring out of the
‘before striking ‘the submarine and 'a' positive
projector or” from the instant when they reach 60 buoyancy
thereafter, which compris$
?ring a
the water. If timing is done from the‘ instant
drop substantially
of projection of the missiles some mechanical
simultaneously into:the water in 'a given area
arrangement may be used whereby th'e‘rotation
and descend and rise at known rates,‘ measuring
of the handle 26 will start the timing interval.
The rising of vthe projector out of the Water again, 65 ‘the time" intervals between‘the' ?ring and ‘reap
pearance of the‘ projectiles when they break‘ the
however, after a submersible‘ object has been
surface and noting their distance and bearing.
encountered will in general be noted either by
in a rather con?ned area.
' 2. A method of spotting submerged submarines
the eye or by some stop watch mechanism to
with’ a projectile having a‘ negative buoyancy
end the timing interval when the‘ missile is ob
served coming out of the water. The computa 70 before striking the submarine and a positive
buoyancy thereafter, which vcomprises"?ringifa
tion'of the depth is a simple. proportioned rate.
group of projectiles directed to drop substantially
‘simultaneously into the water in a, given area
and descend and rise at known rates, measuring
‘the ‘time; intervals between the‘ moment when the
as observed, then the depth may-be‘ judged as 200 75 projectiles
Strike’ the waterianu reappear again
That‘ is if one second represents 20 feet of depth,
two seconds would represent'llO feet and soy on,
'so that if the time interval should be 10 seconds
and noting the distance and bearing of the pro
3. A system for spotting submerged submarines
comprising in combination a projectile having a
negative buoyancy before striking the submarine
and means released from the projectile upon
striking to provide a positive buoyancy, and means
for ?ring groups of said projectiles said means
adapted to space the projectiles over a given 10
water area and to drop said projectiles substan
tially simultaneously into the water whereby a
submarine may be spotted by comparing the time
intervals between the striking of the water by the
projectiles and their reappearance.
4. A system for spotting submerged submarines
comprising in combination a projectile having a
negative buoyancy before striking the submarine
and means released from the projectile upon
striking to provide a positive buoyancy, and
means for ?ring groups of said projectiles adapted
to space the projectiles over a given area and to
drop substantially simultaneously into the Water,
said means providing substantially the same ver
tical velocity component for the projectiles.
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