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Патент USA US3097610

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July 16, 1963
J. c. HOPKINS ETAL
3,097,500
SOUND GENERATOR
Filed April 25, 1946
2 Sheets-Sheet v1
FIG.
INVENTORS
JAMES C HOPKINS
OWEN G BENNETT
BY
ATTORNEY
July 16, 1963
J. c. HOPKINS ETAL I
3,097,600
SOUND GENERATOR
Filed April 25, 1946'
'
2 Sheets-‘Sheet 2
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JAMES
5i
FIG. 6.
INVENTORS
c. HOPKI
OWEN c. BENNE
BY
ATTORNEY
3,897,688
Patented July 16, 1963
2
cedures has been found in practice to withstand as much
3,097,600
SOUND GENERATOR
James C. Hopkins, Cambridge, Mass, and Owen G. Ben
nett, Baltimore, Md., assignors to the United States of
America as represented by the Secretary of the Navy
Filed Apr. 25, 1946, Ser. No. 664,870
7 Claims. (Cl. 102-7)
(Granted under Title 35, US. Code (1952), sec. 266)
or more than 600 psi. hydraulic pressure as well as the
terri?c shock pressures developed during the series of
under-water explosions.
Each disc 12 (FIGS. 1, 4 ‘and 6) has a series of open
ings 48 in the outside wall which openings are adapted to
house explosive caps '50. Small holes 52 connect each
opening 48 with a circular groove 54 of rectangular cross
sectional shape. A delay fuse 56 is packed in each groove
This invention relates to a ‘sound generator and is illus 1O 54 and relay fuses 58 are packed in the small holes 52.
trated herein as embodied in an explosive, underwater,
A single aperture or ori?ce 601 is provided in the top of
noise-making device for masking the sound of a sub—
each groove 54 thereby permitting the fuse train to com
marine during the performance of evasion maneuvers.
municate with the groove 54 of the next adjacent disc.
It is an object of the invention to provide an explosive
Similarly, a single ori?ce 61 is provided in the transfer
noisemaker adapted to be ejected from a signal tube of a 15 plate 46, the position of this ori?ce ‘determining the delay
submenged submarine and to ?re a rapid succession of
from the initial ?ring to the ?ring of the ?rst explosive
explosive charges underwater.
cap 50. It is apparent that by the rod-nut adjustment
A further object of the invention lies in the provision
14--18 the apertures 60 may be aligned or staggered
of a ‘gasket means ‘for effecting a waterseal for the noise
in the assembly with respect to each other, staggered
maker.
20 formation being variable up to a limit of 180 degrees one
With the above and other objects and features in view,
from the other.
the invention will now be described with reference to the
The trigger mechanism, as stated above, is carried by
accompanying drawings which illustrate a preferred em
the base 2-8-—32 (FIGS. 1 and 5) which is secured by
bodiment of the invention and will be pointed out in the
screws such as 62 to the disc 28. A tripping lever 64 hav
claims.
25 ing a key projecting portion 65 is pivoted at 66 to an
In the drawings:
upstanding lug 68 ?xed to the base 32. A hammer 70
FIG. 1 is a cross sectional view of the explosive noise
maker;
is also pivoted as at 72 to the lug 68 and a spring 74 tends
to pivot the hammer 70 towards the base 3-2. In assem
FIG. 2 is a front elevation thereof;
bly, the trigger mechanism is cooked and then locked in
FIG. 3 illustrates the noisemaker with a parachute sus 30 position by a safety ring pin 76 and stub shaft 78. As
pension;
FIG. 4 is a cross sectional view taken ‘along the line
IV—IV of FIG. 1;
FIG. 5 is a detailed cross sectional elevation showing
the trigger mechanism in ?red position; and
FIG. 6 is a partial cross sectional view through one of
the explosive holding discs showing the interconnecting
opening at the top of the fuse groove.
With reference to FIGS. 1 and 3, the device generally
indicated at 10, consists of a ‘series of discs 12 stacked
on a hollow metal rod 14 threaded at its opposite ends.
The rod 14 is screwed at one end into a base assembly
16 comprising a trigger mechanism and a time delay fuse
later to be described. The opposite end of rod 14 is held
by a nut 18 and ‘a top plate 28. A recess 22 in plate 20
best shown in FIG. .1, the stub shaft 78 passes through
an opening 80 in the lever 64 and through openings 82
(FIG. 5) in guide lugs 84. The pin 76 passes through
an opening 86 in the shaft 78 and projects into a hole
88 in the disc 28 to lock the shaft 78 in position, thus
preventing any movement of lever 64.
An initial primer 90 (FIGS. 1 and 5) is held in a metal
holder 92 which projects inside the hollow rod 14. A
passageway 93 extends entirely through the center axis
of the holder 92 and communicates with a relay fuse 94
that is packed in the hollow rod 14. The relay fuse 94
extends through openings 96 in the rod 14 into a circular
groove 98 in the base 28.
A heat transfer plug 100 (FIG. 1) is positioned within
surrounds the rod 14, a steel washer 24 and a rubber
and threaded into the bore of rod 14. The heat transfer
plug is provided ‘with a coating of ?ash powder and an ex
grommet 26 being positioned in the recess.
The base assembly 16 (FIG. 1) includes a circular base
pulsion charge 104 is packed internally of the rod 14 be
tween the plug 1001 and the top end of the rod 14.
28 to which is secured a trigger mechanism.
As shown in FIG. 1, a metal washer 106 and a rubber
The discs 12 (FIGS. 1 and 6) are each provided at their 50 Washer 108 are positioned on the top end of rod 14. A
upper surface with a shallow, inner, annular recess 38.
round nut 110 is threaded to the rod 14 and a metal cover
A gasket 42 is positioned over each recess 38 and a rela
cap 112 frictionally engages the outside surface of the nut
tively thin transfer plate 46 is interposed between the
and bears against the washer 108.
base 28 and the lowermost disc 12 of the stack. It is ap
A parachute 114 (FIG. 1) is housed in a split can con
55
parent that by taking up on the nut 18, the stack of discs
tainer 116 secured by screws 118 to a metal disc 1201 which
12 and the interposed gaskets 42 are compressed tightly
is threaded to the nut 18. A steel plate 122 and a felt
together between the top plate 20 and base 28, ‘the lapping
disc 124 are positioned in the container 116 to protect the
of gaskets 42 over the peripheries of the recesses 38 insur
parachute 114 from burning by the expulsion charge 184.
ing a water-tight seal of the parts. Furthermore, the
The parachute shrouds 126 are attached to a steel loop
60
washer 24 will tend to compress the rubber grommet 26
128 which is anchored to the disc 1201.
against the threads of rod 14 thus providing a water-tight
In operation, the explosive noisemaker device 10/ is
joint between the ‘top plate 20 and rod 14. By the fore
loaded into a submarine’s signal tube (not shown), the
going, it is seen that a water-tight seal is effected over each
key projecting portion 65 of the tripping lever 64 being
explosive cap 50 and throughout the entire assembly.
placed in a key-way provided in the signal tube wall. The
Preferably, the entire assembly is dipped for multiple 65 safety pin ‘76 and shaft 78 are then removed. As the de
coatings in a varnish ‘of the Bakelite type. This is done,
vice 10 is ejected out of the signal tube by a suitable ejec
following a baking of the unit in an oven at a temperature
tion means (not shown), the projection 65 engages the
approximately 100° F. to expand and expel as much im
end of the key-Way and swings the lever 64 on its pivot 66
prisoned air ‘as possible and to cause a reduction ‘of in
to release the hammer 70‘ thus permitting the hammer to
70
ternal air pressure as the warm unit is dipped in the cooler
strike the initial primer 98 (FIG. 5). The primer ignites
varnish. The water seal effected by the foregoing pro~
the relay fuse 9'4 and a ?ash from the coating on the heat
3,097,600
4
transfer plug 106} ignites the expulsion charge 104. The
expulsion charge forces the cap 112 from the nut 116 and
the split can container 116 .is forced free from the disc
12% by a shearing action of the screws 118. The split can
116 then falls away and the exposed parachute 114 sup
ports the explosive noisemaker and retards the rate of
descent of the noisemaker.
The parachute 114 opens and supports the device 10 be
fore the relay fuse “4 sets off the ?rst delay fuse 56. The
for retaining said discs withtheirori?ces in adjusted posi
tion.
.
3. A sound generator comprising, a series of discs in
stacked arrangement, each disc having a plurality of aper
tures for receiving exposive charges, each of said discs be
ing provided with a groove having intercommunicating
channels with each of said apertures, each disc having a
single ori?ce therein for communicating ‘with the groove of
the next adjacent disc in uniform or different relative posi
fuse 94 burns through the openings 96 in the rod 14,. 10 tions with respect to each other, means for retaining said
around the circular groove 98 and through the ?rst ori?ce
discs with the single ori?ces thereof in an adjusted posi
61 in transfer plate 46 to the ?rst fuse 56. As the fuse 56
tion, each .of said discs having a central opening, said
burns around the groove 54 the relay fuses 58 are ignited
central openings being aligned for receiving an explosive
in succession and the explosive caps 5i) set off seriatim.
charge therein.
The openings 60' provide a continuous train between the 15
4. Apparatus as in claim 3 including means for ‘retard
fuses 56. It is apparent that as the fuse 56 burns around
ing the descent of said generator in water, said retarding
the groove 54 and through the openings 60, the fuses 56
means being retained adjacent said sound generator, at
in the grooves 54 are ignited one after another and the
least a portion of said explosive charge within said central
explosive caps 55} are set off successively atra predeter
opening being in proximity to said retarding means and
mined rate. It is obvious that certain caps of a disc 12
operative to release said retarding means upon detonation
will be set off concurrently with certain of the'caps of a
thereof.
preceding disc by virtue of the simultaneous ignition of
. 5. Apparatus as in claim 4 including a heat transfer
the caps through the fuse train described.
plug inserted within said central opening for detonating
The invention described herein may be manufactured
said portion of said explosive charge in proximity with
and used by‘ or for the Government of the .UnitedStates 25 said retarding means prior to the detonation of said
of America for governmental purposes without the pay
explosive charges in said apertures in said discs.
ment of any royalties thereon or therefor.
6. Apparatus as in claim 5 wherein said retarding
Having described the invention, what is claimed-as novel
and desiredto be protected by Letters ‘Patent of the United
States is:
1. An underwater soundgenerator comprising a series
of discs stacked one upon theother, each disc having'a
series of spaced openings, an explosive charge in each of
means is disposed at one end of said sound generator, a
lever and movable hammer are disposed at the other end
of 'said sound generator, tripping of said lever causing
release of said hammer, and a priming charge is located
at said other end within said central opening in the path
of travel of said movable hammer.
said openings, an annular groove in each disc interconnect
7. Apparatus as in claim 6 wherein said retarding
ing said openings and having an opening leading therefrom 35 means comprises a parachute, a split can containing said
intercommunicating with the annular groovev ofthe~next
parachute and attached at said one end of said sound
adjacent disc, fuse means in said openings and grooves,
generator, said portion of explosive charge in proximity to
means for retaining said .discs in stacked formation with
said split can upon detonation thereof forcing said split
said lead openings in uniform or differentrelative posi
can from said sound ‘generator ‘and expelling said para
tions with respect to each other and means for initiating 40 chute.
the ignition of thefuse associated withthe first disc of
the series.
References Cited in the ?le of this patent
2. A sound generator comprising a series of discs in
UNITED STATES PATENTS
stacked arrangement, each disc havinga pluralityof ‘aper
372,753
Hurst _______________ __ Nov. 8, 1887
tures for receiving explosive charges, each of said discs 4
1,300,333
Berry ________________ __ Apr. 15, 1919
being provided with a groove having intercommunicating
1,434,784
Lucas ________________ __ Nov. 7, 1922
channels with each of said apertures, and each disc having
a singular ori?ce therein communicating Withthe groove
FOREIGN PATENTS
of the next adjacent disc in uniform or different relative
positions with respect to each other, and adjustable means 50
498,255
'
France _______________ __ Oct. 11, 1919
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