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Den 3, 1946.
1.. G. BOSTWICK ETAL
2,411,365
SUBMARINE SIGNALING DEVICE
Filed Feb. '10, 1944
_
6 Shee_ts-Sheet 1
22
60
98
I02
.99
'
__
L. G. BOSTW/C‘K
1
INVENTORS
@ ®®
>
J_ H K/NG
BY
04% a. 1M
ATTORNEY
Dec. 3, 1946.
’
|_. e. BOSTWICK ET AL
2,411,355
SUBMARINE SIGNALING DEVICE
Filed Feb. 10, 1944
‘
6 Sheets-Sheet 2
22'
LGBOSWCK
'"ZENWS
J; H; KING
Y
94m 6.
v}
ATTORNEY
‘
Dec. 3, 1946. _
1.. G. BOSTWICK ETAL
‘
2,411,365
SUBMARINE SIGNALING DEVICE
Filed Feb. 10, 1944
6 Sheets-Sheet 3
Dec._ 3,1946.
L. e. BQSTWICK 'ETAL
2,411,865
SUBMARINE SIGNALING’ DEVICE
Filed Feb. 10, 1944
I
6 Sheets-Sheet 4
60
' L. a. BOSTW/CK
ATTORNEY '
me. 3, 1946.
i... G. BOSTWICK ETAL.
2,41 1,865
SUBMARINE SIGNALING DEVICE
Filed Feb. 10, 1944
_ 6 Sheets-Sheet 6
FIG. 8
2/
G. BOSTW/CK
wvEivToRs 1.. J.
H KING
5' V
A T TOR/V5 r"
Patented
3,
‘2,411,865
Lee G. Bostwick and Jo
.
. 5.,
,-».
E. ‘is-1. g, Cbatham, 1
gnors to Bell Telephone Laboratorlw,
Incorporated, New York, N. Y” a coratlon
or New York
it, ran, SerialNc. 521,782
(91. 177-388)
1
phragm due to variations in the hydrostatic pres—
sure thereon but is not actuated in response to
vibrations of the diaphragm at frequencies within
the operating range of the signaling device.
In accordance with a further andlvspeci?c fea
This invention relates to submarine signaling
devices and more particularly to high power projectors of the direct radiating diaphragm type
especially suitable ‘for the propagation of low
_
frequency signals.
ture of this invention, thelinkage between the.
The attainment of high'iptensity signals in a
submarine signaling device or the diaphragm type
entails, inter alia, the use of a diaphragm 0! sub-_
'. stantial area and capable oi large amplitude
vibrations. In addition, in devices operable at
diaphragm and the microswitch includes a me-'
chanical ?lter element of such. parameters that
the microswitch will be actuated only, in response’
to displacements of the diaphragm at frequencies
below the lowest frequency in the range the sig
low frequencies, the diaphragm must have a sup‘
\ naling device is intended to translate‘.
porting or suspension system oflow stiffness in
In one and particularly advantageous construc
order to place the fundamental resonance fre
tion, the ?lter element comprises a spring integral
quency of the vibrating system low in the fre
quency range. As a result; when such a device is 15 with the diaphragm and coupled toga mechanical resistance defined by a. paddle member cscil- v
submerged, and particularly when it is submerged
latable in a body of highly viscous liquid.
to considerable depth, large amplitude displace
The invention and the above-noted and other I
ments of the diaphragm may occur due to the
features thereof will be understood more clearly
hydrostatic pressure upon the diaphragm. Such
displacements would deleteriously affect the oper 20 and fully from the following detailed description‘
with reference to the accompanying drawings in
ation of the device and might result in damage
to the diaphragm and the supporting or suspen
Fig. l is a perspective view of a submarine sis=
sion system therefor.
which:
'
"
'
‘
naling device illustrative of one embodiment of'
' One object of this invention is to substantially
prevent net displacement of the diaphragm» of a
submarine signaling device due to hydrostatic.
pressures while allowing large amplitude vibra
this‘ invention;
'
Fig. 2 is a side view mainly in section‘ of the‘
signaling device shown in Fig. 1;
Fig. 3 is a rear view of the device shown in
Figs. 1 and 2, aportion' of the back of‘ the hous
forces applied thereto.. More speci?cally, one
object of this invention is to compensate ac 30 ing and a part of the reservoir being removedi
tions of the diaphragm in accordance with signal _
>
curately and quicklyfor variations in hydro
static pressures acting upon the diaphragm of a
submarine signaling device, to maintain the dia
. phargm in its normal neutral position}
In accordance with one feature of this inven
Fig. '4 is a detail view in section along plane
5-5 of Fig. 3;
'
Y
'
tion, a submarine signaling .device comprising a
impedance element included in this system being
diaphragm having one surface in communication
with the sea and the opposite surface enclosed
broken away to show details of construction:
Fig. 7 is a side view mainly in section of a sub
by a housing, is provided with a chamber or reser
marine signaling device illustrative o‘i another
embodiment of this invention;
means actuated by the diaphragm for releasing
Fig; 3 is a rear view of the device shown in
gas from the chamber into the housing or from
Fig‘? with a portion of vthe ‘housing removed;
the housing into the sea‘to maintain equality
between the pressures acting upon the opposite
- surfaces of the diaphragm.‘
In accordance with anothervfeature of this in- ’
operated valve coupling the chamber to the inte-3
rior. of the housing and a microswitch for con
trolling the energizing circuit for the solenoid ‘of
the valve, and a mechanical linkage between the
diaphragm and the actuating element of the
microswitch is provided, the linkage being con
structed and arranged so that the switch is oper
ated in response to displacements of the dia
'
Fig. 6 is a top view of the impedance element;
voir containing a gas under pressure ‘and with
vention, the aforesaid means includes a solenoid
'
Fig. 5 is a detail perspective view of the sole
noid operated valve and the actuating system for
35 the switch therefor. a portion of the mechanical
“
~
and
-
Fig. 9 is a perspective view of the control sys
team for the valves in the‘ device illustrated in I
Figs. '3 and 8.
I
-
,
.
Referring now to the drawings, the submarine
signaling device illustrated in Figs. 1 to 6 in’
elusive comprises a rugged housing 20, for example ~
cast of-metal, provided with mounting lugs ti
and having ‘secured in ?uid-tight relation'to the
front end thereof, as by a plurality. of bolts 22,
an annular face plate 23 which mounts a signal
traiatpa‘ unit. ‘This unit, which advantage-7
2,411,885
ously is of 'the' moving coil type as shown in
Fig. 2, comprises a magnet assembly including
coaxial pole-pieces 24 and 25 de?ning an annular
gap .26. The pole-pieces are clamped against
opposite ends of a cylindrical permanent magnet
21 by screws 28 and are maintained in accurate
coaxial relation by a‘ non-magnetic spacer ring
29.
4
tuating element 55 therefor is supported by'a rigid
bracket 58 secured to the housing 2|). Electrical
connection to the solenoid is established by way
of a cable 51. The construction is such that nor
mally, ‘that is, when the solenoid is deenergized,
the valve is closed, ‘and when the solenoid is ener
gized, the valve is opened and gas from the cham
ber 49 ?ows into the housing 20.
a
.
Secured to the poleepiece 25, as by houses,
The solenoid energizing circuit includes a mi
is a shallow, apertured, dished, non-magnetic 10 croswitch 58, shown in Figs. 4 and 6, which is
frame 3| which is secured also vtothe face plate
mounted on a supporting strip 59 and is actuated
23 as by bolts 32. An annular diaphragm, for
by a linkage extending from the diaphragm, il
example of metal such as beryllium copper, in
lustrated in Figs. '4, 5 and 6. As shown most
cludes an intermediate concavo-convex portion
clearly in Fig. 5, the outer '?exible portion 35
33 and irmer and outer portions 34 and 35, re 15 of the diaphragm includes a ?nger or spring
spectively, of sufficient ?exibility to allow free
member 60 to which a drive pin 8| is a?ixed, the
vibration of the intermediate portion 33 as a
pin extending through but ‘not touching an aper
whole analogous to a piston. The peripheral part
ture reducing bushing 90 a?lxed to the frame
of the outer portion 35 is clamped to the frame
3|, and into engagement with‘ the actuating ele
3| 'by a ring 36 and the inner edge part of the 20 mentof the microswitch 88. Associated with the inner ?exible portion 34 is clamped against a
drive pin BI is a mechanical resistance element
pnotuberance 31 on the pole-piece 24 by ‘a non
which comprises a casing 62 having mounting
magnetic ring 38. .Thediaphragm has a?ixed
arms 63 which are secured to the frame 3| and
thereto a cylindrical mount 39, for example of
face plate 23 by bolts 64. The casing .is partially
insulating material, such as phenol'fabric, which
~ ?lled with a highly viscous ?uid, for example an
extends into the gap 26 and carries a. driving
coil 40.
-
on known commercially as “Vistac,” and has af
‘
fixed thereto by a cap 65 a resilient sealing mem
Over-lying the diaphragm and secured in inti
ber 66, for example of neoprene. Immersed in
the ?uid ?lling is a cylindrical paddle member
61‘ which is supported by‘a rocker element 68
having an arm 69 provided with an aperture ‘i0
of which is- clamped between the face plate 23
through which the drive pin 6| extends. The
and the ring 36 and the central portion of which
arm 69 has threaded thereinto a pair of aligned
is clamped against the ring 38 by a‘ non-magnetic
cone pivots 1| engaging the drive pin 6|. The
stud 42 ?xed in position by a bolt 43. The dia
rocker element 68 has threaded thereinto a pair
phragm 4| serves as a sound barrier at‘ frequene
of cone pivots 12, which are aligned 'and'posi
cies up to several hundred cycles per second and
tioned substantially in the plane of the sealing
has a ?uted portion |||l therein to ‘increase its
member 66 so that the stiffness reaction of the
?exibility.
,
member 66 is minimized andhigh sensitivity com
Electrical connection to the coil 40 and we 40 pensation is ‘obtained. Motion of the paddle
'microswitch described hereinafter may be “es
member 61 through the viscous ?uid develops a
tablished by way of a cable, a portion of which is '
high mechanical resistance, as is apparent.
--shown at 44 in Fig. 2, which enters the housing
The casing 62 is provided with an arm." to
. mate engagement with the intermediate portion
33 thereof is a protective membrane or diaphragm
4|, for example of gum rubber, the peripheral part
20 through a suitable‘ water-tight stu?ing box 45. '
When the submarine signaling device is sub
merged, the diaphragm 33 is subjected to hydro
static pressures which might deleteriously affect
the operating characteristics of the device and
which might be of such magnitude, particularly
when the device is utilized at great depths, as
58 is secured by screws 14.
The mechanical resistance element and the
spring arm 60 are constructed and arranged so
that the rod 6| moves in response to even small
changes in the hydrostatic pressure effective up
on the diaphragm but remains substantially sta- ‘
to distort or even destroy the diaphragm. In ac
tionary when the diaphragm vibrates in response.
to signal currents supplied to the driving coil
cordance with a feature of this invention, means
are provided for counteracting the hydrostatic
pressure upon the diaphragm to maintain the
steady pressures effective upon the two faces of
the diaphragm in equilibrium.
As shown in Fig. 2, the housing is provided with
a substantially hemispherical wall 46, which may
be cast integrally with the housing, and a cover
member having a substantially hemispherical Wall
41 concentric with the wall 46 is secured in ?uid
tight relation to the rear of the housing, as by
which the mounting stripv 58 for the microswitch
therefor. ' The principles involved will be under
stood from the following considerations.
The rod 6| is moved in response to. displace-'
ment or motion of the diaphragm, the motion or
displacement of ‘the diaphragm being communi
cated'to the rod by way of the spring arm 60.
This arm, viewed as a mechanical impedance ele
60 ment,'is essential‘y a, stiffness.
bolts 48. The two walls 46 and 41 bound a fluid- =
Associated with
the rod and arm is the resistance element which
constitutes a resistance in parallel with the sti?- I
ness noted. The stiffness and resistance de?ne a
tight chamber or reservoir 49 into which gas,
mechanical ?lter so that, as will beapparent, the
‘such as air, under substantial pressure may be
motion of the rod 6| as afunction- of frequency
introduced through a valve 50 and from which
will be dependent upon the constants of the filter.
gas may escape into the housing 20 by way of a
These constants may be correlated to effect dis- _'
port 5| in the wall 46. Threaded into the port
criminatlon against a desired range of freq'u'ene
5| is a coupler member 52 through which com
cies. Speci?cally, in a device of the construc
munication is established from the chamber 49 70 tion described, the parameters involved are cor
to one side of a solenoid operated valve 53 of con-I
related so that the ?lter discriminates against
, ventional construction, the valve having a re
stricted outlet coupling 54, shown in Fig. 3, in
communication with the interior of the housing
20. The valve,‘ together with the solenoid @0
frequencies-in the intended operating range of.
the device, whereby the rod 6| is moved in re
sponse to steady displacement of the diaphragm
or vibration thereof below the operating range,
, -
aera'ece
but motion of the rod is prevented in this range.
realized. Attainment of high power capacity re- '
quires the use of a fairly large diaphragm,large
In a particular ‘device of the construction .de
scribed hereinabove and intended to operate most
'emcientiy in the range from 20 to 350 cycles per
vibrational amplitudes and a driving coil ca- _
pable of dissipating the heat generated therein
resistance average, was approximately 15x 10*3
when signal currents requisite, for the vibrational
amplitudes involved are supplied thereto. In a
speci?c device intended for operation in the range
mechanical ohms at 70° F. has‘ been found ej?ec=
tive to prevent motion of the driving pin .Giat
square sound pressures of the order of 300ildynes
second,'a ?lter wherein the stiffness- was of ap- -
proximately 4x106 dynes per centimeter and the
noted above and capable of producing root mean '
frequencies above about 10 cycles per second even 10 per square centimeterat a distance of 1 foot from
though the amplitude of the diaphragm displace
- ‘the front of the device, .a diaphragm wherein
ment in the operating rangewas several times ' ‘the inner and outer diameters of the bodily
that below this range.
,
vibratile portion 33 are approximately 3 inches
_
When the submarine signaling device is sub
‘and 8 inches, respectively, this portion was vi-, _ (
merged, the diaphragm is displaced inwardly due 16 bratile at amplitudes of ‘the order of 0.41 cen
to the increasing'hydrostatic pressure thereon.
timeter from its neutral position and a driving
This displacement of thediaphragm results 1in
motion of the driving‘pin 6;] as described above,_
coil capable of radiating of the order of 125 watts _
as heat vhave been found satisfactory.
so that the microswitch contacts are closed and
The response frequency characteristic of the
_ the solenoid 55 is actuated to open the'valve 53, 20 devicewill be determined by the mechanical
whereby air under pressure ?ows from the cham
constants of the diaphragm‘and the parameters
of the acoustic elements associated. therewith.
In a construction‘ found particularly satisfactory, the diaphragm constants were such that
the resonance frequency of the diaphragm was
approximately 23 cycles per second in open
. ber 49 into the housing 20. Thus, the pressure
I actingvupon the rear face of the diaphragm_'is
increased. when the latter pressure is equalto
the hydrostatic pressure upon the front face of .
the diaphragm, the‘ diaphragm is returned to, its
initial position, the microswitch operates to open '
water, the e?ective mass of the vibratory sys- '
the solenoid circuit and the valve 53 closes.
tem being approximately 450 grams and the
stiffness of’ the suspension. portions tdandt?
' Hence, the diaphragm is maintained in-its nor
mal neutral position for operation at any desired 30. being approximately 48x10“ dynes per‘ centi- '4
depth. In a speci?c construction, it has been? meter.4 The diaphragm resonance may be
found that the me a position of the diaphragm
damped by a plurality of acoustic resistances, two~
is maintained within‘i 10.010 inch, while vibra-'
of‘ which are shown on Fig. 2, each defined by
tional amplitudes of ‘the diaphragm, in accord
a metallic cylinder 8? provided with a multiplies‘
ance with signals, of at least ten'times this value 35 ity of_fine .slets, ?tted in the apertures in the
are permitted without operation of‘ the micro
frame ti and closed at one end by a cap 88. The
switch.
.
frame 88 is imperforate except for the openings
‘
When the signaling device is raised, the pres
in which the cylinders 8? are ?tted and de?nes
with the diaphragm and the pole pieces a cham
to maintain equilibrium between the pressures 40 ber which is made of such small volume that it
upon opposite sides of the diaphragm; For this
does not reduce appreciably the, flow of air
sure within the housing is reduced automatically
purpose, there is provided a vent which comprises
a coupler 1:8‘ threaded into the housing 2% and
having therein a bore 11 and a recess 78, the lat
ter having a port-‘I9 communicating therewith.
Secured in water-tight engagement with the cou
' pler ‘it. is a cap 86 into which a slender tube 8|
communicating with the bore ‘I1 extends. A sec-'
through the apertures within the band of fre
quencies ‘ adjacent
.
-
resonance
volume that varlationsin its stiffness when the
depth- do not alter the resonance frequency of the
vibratory, ‘system by more than of they order of
10 per cent. Inaspeci?c construction, a cham
ber having a volume of the order of 19X 10? cubic
centimeters has been found satisfactory, result
ets or clamps 88. Disposed within the recess and
opening is positioned.
diaphragm
signaling device is. submerged to a prescribed '
ond open-ended slender tube 82 extends from the
port ‘it and isaf?xed upon the housing by brack
positioned by four pins 88 is a ?oatable ball at
over which a disc 88 having a restricted central
the
frequency. The largechamber bounded by- the' '
a housing to and the frame at is made of such
> ing in a change of not more than 10 per cent in
the resonance frequency of the vibrating system
_
- Whenthe pressures‘upon opposite sides of the 55 when the device is submerged to a depth of 50
diaphragm are equal, the hydrostatic pressure . feet. With such‘ device, a sound ?eld wherein
within the cap 8d established by way of the tube
82, coun'terbalances the pressure within the cap
the pressure is constant within 511.0 decibel over
the operating range from 20 to 350 cycles per.
due to the air within'the housing 26. vIf‘ the sig- -
second has been obtained.
naling device is raised, the pressure within the 60
The submarine signaling device illustrated in
Figs. 7 to 9 is of generally the same construction‘
as that illustrated in Figs. 1 to '6, inclusive, and’
housing exceeds the hydrostatic pressure so that
air is released from the housing by way of the
port ‘it and tube 82 until equilibrium between the
two pressures is established.
.
'
described hereinabove but ‘differs therefrom in
the control system for effecting compensation
The ball 85 in cooperation with the disc 85 65 for variations in the hydrostatic pressure upon
the diaphragm. Specifically, the compensating
constitutes a check valve to prevent ?ooding of
the cap to and flow of water into the housing‘ .system included in the device illustrated in Figs.
2c in the event of failure of the compensation.
7 to 9 comprises the solenoid controlled valve- 53
As has been noted hereinabove, in a specific
for allowing?owof air from the reservoir (it into
device of the construction described, the intended 70 the interior of the housing 2@ to counteract hy
operating range is substantially 20 to 350 cycles
drostatic pressures acting upon the diaphragm,
and a second solenoid controlled valve 8i having
per second.‘ In such a device, a number of param»
eters must be correlated in a particular manner
especially if, uniformity of response over the op-v
a restricted inlet gland having its outlet con.
nected by a pipe 93 to the vent 9d, the valve 9i.
erating range and high power capacity are to be 75 when open, allowing release of air from the in
2,411,866
7
8
.
terior of'the housing 20 when the air pressure
within the housing exceeds the hydrostatic pres
sures upon the diaphragm. The vent 94 may bi!
similar to the vent 80 and provided with an out
let 95. The energizing circuit for the solenoid
of valve 53 includes the microswitch 58 and that
for the solenoid of valve 9| includes a similar
impedances of a mechanical mesh associated with
the diaphragm. If these impedances are corre
lated so that the resonant frequency of the mesh
is well below the intended operating range of the
device, the rocker 99 will remain substantially
stationary when the diaphragm vibrates at fre
quencies within this range but will be tilted, in
microswitch 96, the two microswitches being
mounted upon a support 91 secured to the pole
piece 24.
‘
5‘
"1
'
‘
The support 91 comprises parallel arms 98 from
which a rocker member 99 is supported by trun
nions I90. The rocker member includes a pair
of transverse strip members NH carrying adjust
able contactors I 02' for engaging the actuating
buttons of the microswitches, and carries at its
ends weights I93, the purpose of which will be
pointed out hereinafter. The rocker member_
the manner described above, in response to
‘changes in hydrostatic pressure upon the dia
10 phragm, to effect operation of the microswitches
and thus result in equalization of the pressures
acting uponopposite sides of the diaphragm. In
a particular device intended for operation in a
range of frequencies from 20 cycles per second
up, the impedances may be correlated so that the
mesh noted is resonant at about 6 cycles per
second.
.
In some cases, dissipating or mechanical re
and weights are constructed and arranged so
sistance elements may be provided in association
that normally ‘the rocker assembly is balanced 20 with the rocker arm 99 to increase the discrim~
with respect to the trunnions and the contacts
ination between vibrations of the diaphragm at
I92 are spaced slightly from the actuating but
the intended operating frequencies of the device
tons of the microswitches whereby, normally,
and at lower frequencies, as to their effect upon
‘both solenoids 55 are" deenergized and both the
the rocker arm. ‘
,
valves 53 and 9| are closed. The rocker 99 is 25
Although
speci?c
embodiments
of the invention
actuated by the drive pin 6| by way of a gener
have been shown and described, it will be under
ally U-shaped spring I04 which has its opposite .
stood that they are but illustrative and that vari
ends secured to the drive pin and the rocker.
ous modi?cations may be made therein without
member.
'
Brie?y, the operation of' the compensating 30 departing from the scope and spirit of this inven
tion as de?ned in the appended claims.
system is as follows: As noted heretofore, nor
What is claimed is:
mally, that is, when the diaphragm is at its
l. A submarine signaling device comprising a
neutral position, both valves 53 and 9| are closed. ‘
diaphragm having one face for communication
When the signaling device is submerged, due to
the increasing hydrostatic pressure thereon the 35 with the sea, means de?ning a chamber with the
opposite face of said diaphragm, signal translat
diaphragm is displaced inwardly so that the
ing means cooperatively associated with said dia
rocker member 99, driven by the pin BI, is tilted
phragm, and means for compensating for varia
in the clockwise direction to operate the micro
tions in hydrostatic pressure upon said one face
switch 58, thus causing the valve53 to open. _Air
from the chamber 49 flows into the interior of 40 to maintain the pressures on said one and oppo
site faces substantially equal, said compensating
the housing 20 to counteract the hydrostatic
means comprisingv a, reservoir containing a gas
pressure upon the diaphragm, vuntil the dia
under pressure, a normally closed valve between
phragm is returned to its neutral position. If
said reservoir and said chamber and means actu
the pressure within the housing 29 exceeds the
hydrostatic pressure on the diaphragm, as occurs 45 ated in accordance with displacement of said dia
phragm only at frequencies below a preassigned
when’ the signaling device is raised, the dia
frequency and in the direction corresponding to
phragm moves outwardly so that the rocker
increase in said hydrostatic pressure for opening
member 99 is tilted in the counterclockwise di-'
said valve.
_
‘
rection to cause operation of the microswitch 96.
2. A submarine signaling device comprising a
Consequently, the valve 9| is opened. and air
diaphragm having one face for communication
escapes from the housing through the vent 94,
with the sea, said diaphragm having a bodily
95 until the diaphragm is restored again to its
neutral position. Thus, equilibrium between
the static pressures acting upon the opposite
sides of the diaphragm is maintained.
vibratile portion and a. ?exible mounting portion,
means de?ning a chamber with the opposite face
55 of said diaphragm, signal translating means c0
The actuating means for the microswitches
constitutes a mechanical system which discrimi
nates between slow or very low frequency dis—
. placement of the diaphragm and vibration there
operatively associated with 'said diaphragm, a
reservoir containing a gas under pressure, a valve
for coupling said reservoir to said chamber, ac
tuating means for said valve, and means includ
of at higher frequencies, whereby the micro: 60 ing a driving element coupled to said ?exible
mounting portion of said diaphragm for operat
switches are operated only in response to dis
placement of the diaphragm at frequencies below
ing said actuating means to open said valve when
the lowest frequency in the intended operating
the pressure upon said one face exceeds that upon
frequency range of the signaling device.
said opposite face.
It will be apparent from-a consideration of 65
the mechanicalsystem involved in the operation
~
3. A signaling device for translating signals
within a preassigned operating frequency range,
comprising a diaphragm, means de?ning a cham
of the rocker 99 that the motion of the rocker in
relation to frequency of displacement of the dia
ber with one faceof said diaphragm, a reservoir
phragm will be dependent upon the parameters
containing a gas under pressure, a valve coupling
of the rocker, spring I“ and spring arm' 90 con-' 70 said reservoir to said chamber, actuating means
for said valve, and means for operating said valve
sidered as mechanical impedances. The rocker
is essentially a mass, the major portion of which
in response to displacement of said diaphragm
is provided by the weights I93, and the spring
only at frequencies below the operating frequency
I04 and spring arm 60 are essentially stiffnesses.
range of the device, said operating means com
The three elements ‘noted constitute the essential 76 prising a driving member coupled to said dia
earnest
,9
_
in
phragm and ajmechanical .impedance element
having therein a ‘viscous ?uid, 'a‘paddie member,
coupled to said driving member.
immersed in ‘said. fluid, and ~means connecting
said paddle member to said driving member,
.
' 4. A signaling device for translating signals
within a preassigned operating frequency range,
comprising, a
diaphragm,
means _ de?ning
10. A submarine signaling device for translat
ing signals within a preassigned operating fre
quency range, comprising a diaphragm having one
a
chamber with one face of said diaphragm, a re's
ervoir containing a gas under pressure, a valve
coupling said reservoir to said chamber, and
means for operating said valve only in response
face for communication with the sea, means de?n
- ing a chamber with the opposite face of said dia
- phragm, and means for compensati?g for hydro- _ Y
‘to displacement of said diaphragm at frequen 10 static pressure upon saidone face, said means
comprising a reservoir containing a gas under
cies below the operatingfrequency range of the
- device, said operating means including a mechan-
, chamber, means for operating said valve and ac
' ical resistance-stiffness ?lter actuatedby said
diaphragm.
>
~
pressure, a valve, coupling said reservoir to said
_
' tuating means for said operating means respon
.
5. A signaling device for translating signals 15 sive only to displacement of said diaphragm at
frequencies below the operating range of the de
within a preassigned operating frequency range,
vice, said actuating-means including a casing
comprising a diaphragm, means de?ning a, chamcontaining'a viscous fluid, a paddle member oscil-_
her with one face ofsaid diaphragm, a reservoir
containing a'gas under pressure, a valve coupling - latable in said ?uid and a driving connection to
said reservoir to said chamber, and means for 20 said paddle member including a spring actuated
by displacement of said diaphragm.
l actuating said valve only in response to displace
‘11. A submarine signaling device for translate
ment- of said diaphragm at frequencies below
ing signals within a preassignedv operating fre
the operating frequency range of-the device, said
quency range, comprising a diaphragm having
actuating means comprising a mechanical link
age actuated in response to displacement of said
one face for communication with the sea, said
dia'phrgam and including a mass and a stiffness
diaphragm having'aiso a spring portion adja
cent its periphery, means de?ning a chamber with
the opposite face of said diaphragm, a reservoir
resonant at a frequency below said range.
6. A signaling device for translating signals
within a preassigned operating frequency range, -
comprising a diaphragm, means de?ning a cham
ber with'one face of said diaphragm, and'means
for maintaining substantial equilibrium between
the pressures upon said one face and the opposite
30
i
containing a gas under pressure, asclenoid op
erated valve coupling said reservoir
to said cham- _
.
her, a microswitch for controlling energization
of the solenoid for said valve, and means for ac-‘
tuating said switch to effect opening of said valve , -
face of said diaphragm, said equilibrium main
when the pressure upon said one face is greater
taining means comprising means responsive only
to displacement of said diaphragm at frequencies
below the. operating range of the device for in
creasing the pressure in said chamber when the
than that upon saidopposite face-said actuating
means being responsive only?to displacement of
said diaphragm at frequencies below the operat-v
ing range'of the device and comprising a me
chanical frequency discriminating linkage in
pressure upon said .one face is less than that upon
said opposite face and means for decreasing the 40 eluding said spring portion, between said dia
phragm and theactuating element of said switch.
pressure in said chamber when the pressure upon
, 12. A submarine ~signaling device in accord
said one face exceeds that upon said opposite face.
ance with claim 11 wherein said linkage includes
'7'. .A. signaling devicein accordance with claim ‘
in addition to said spring portion a highly viscous
6 wherein said pressure increasing means com
' body and a paddle member immersed in said body
prising a reservoir containing a gas under pres
and connected to said spring portion,
sure, a valve coupling said reservoir to said cham
13. A submarine signaling device in accord
ber, operating means for said valve, and means
ance with claim 11 wherein said linkage comfor actuating said operating» means in response to
prises in addition to said spring portions. sun
displacement of said diaphragm including a me- '
chanical ?lter element coupled to said diaphragm.
50 ness element and a mass element, the combina- ‘
8. A signaling device in accordance with claim
6 wherein said equilibrium maintaining, means
tion of said stiffness and mass elements and said
_ spring portion being vresonant, at a frequency be
low said operating range.
comprises a reservoir containing a gas under .
14. A submarine signaling device for translatpressure, a valve coupling said reservoir to said
chamber, a venting valve for said chamber,‘ and 55 ing signals within apreassigned operating fre
quency range, comprising a diaphragm one face
means for operating said ?rst and second valves
of which is adapted ‘to be exposed to the sea,
to open said ?rst .valve when the pressure upon
signal translating means cooperatively associated
said one face is less than that upon said oppo»
with said diaphragm, means de?ning with said
~site'face and to open. said second valve when the
pressure upon said one face is greater than that 60 diaphragm a chamber opposite the other face
thereof, a second chamber containing a gas under
upon said opposite face, said operating ,means
comprising a mechanical impedance element cou
pressure, valve means connecting said chambers,
pled to and ‘actuated in response to displacement
relief valve means associated with said first cham
ber, actuating means operable in response to dis
of said diaphragm ‘and including mass and sti?a
ness resonant at a frequency below said operat 65 placement of said diaphragm‘for controlling said
ing range.
‘
9. A signaling device comprising a diaphragm
having a ?exibieportion, means de?ning a cham
?rst and relief valve means to maintain ‘the pres
sure upon said other face of said diaphragm sub
stantially equal to the pressure on said one face
thereof,'and means for preventing operation of
her with one faceof said diaphragm, a reservoir
containing a gas under pressure, a normally closed 70 said actuating means in response to vibrations. of
solenoid operated valve coupling ‘said reservoir _
to said chamber, control means for the solenoid
including ‘a switch, a driving member coupled to
said ?exible portion of said diaphragm and to the
said diaphragm at frequencies within the operat
ing range of the device._
' _
-
- ' 15. A. submarine signaling device for translat
ing- signais within a preassigned operating fre
actuating element of said‘ switch, a container 75 quency range, comprising a diaphragm having
.
'
-
‘
.
2,411,865
11
12
one face for communication with the sea, means
de?ning a chamber with the opposite face of
said diaphragm, a ?rst solenoid operated valve
for venting said chamber, a microswitch for the
solenoid of said ?rst valve, a reservoir contain
ing a gas under pressure, a second solenoid oper
upon said one face and to actuate said second
switch when the pressure upon said one face ex
_ ated valve coupling said reservoir to said cham
her, 'a second microswitch for the solenoid of said
second valveb a rocker member for operating said
?rst and second switches, means for tilting said 10
rocker member to actuate said ?rst switch when
the pressure upon said opposite face exceeds that
ceeds that upon said opposite face, said tilting
means including a connection between said dia
phragm and said rocker member‘ and having a
sti?’ness therein, and mass means carried by said
rocker member and resonant with said stiffness at a
a. frequency below the operating 'range of the
device.
~
LEE G. BOSTWICK.
JOHN H. KING.
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