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Патент USA US2404786

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L G BOSTWICK
2,404,786
MOISTURE CONTROL IN AN ELECTROMECHANICAL DEVICE
Filed Sept. 15, 1942
2 Sheéts-Sheet 1
FIG. 2
76A
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INVENTOR
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LGBOSTW/CK
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ATTOP EV
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July 30, 1946-
L. G. BOSTWICK
‘2,404,785
MOISTURE CONTROL IN AN ELEQTROMECHANICAL DEVICE
Filed Sept. 15, 1942
68
I
ZI-SheetS-Sheet 2
G- 4
3
IN [/5N 7'OR
By LG; BOSTW/CK
ATTOR EV‘
Patented July 30, 1946
2,404,786 -
UNITED STATES
OFFICE
airlines
MOISTURE CONTROL IN AN 'EIIEGTRG.
MECHANICAL DEVICE
1
Lee .G- hosiwiek, Ghaiham, N- J” assigiier to Bell
Telephone Laboratories, incorporated, New
York, N. Y., a corporation of vNew ‘York
Application .Seriember 15, 1.9.42,-.Seria11?o 51.5.8421
v1 Claim. (01- 131-1915)
‘This invention relates to electromechanical _de.
2
vapor, may ,cliiffuee, eene‘iratepor otherwise have _
vices and, more particularly, to submarine sig:
ingress, is arranged to enclose a desiccant or dry
naling devices.
ing agent to deprive or exhaust the interior .of
An object of the invention is to improve the
the ehelesure of liquid or liquid vapor that may
structure of such devices and, more particularly,
?nd entrance thereintoe The desiccant may ‘be
of submarine signal wave projectors or radiators.
ene that experiences substantially no chemical or
physical change in the presence of the liquid- or
Submarine signal devices are known in which
the hydrostatic pressure on the moving system
liquid vapor, and may be aiinely divided, activat
or diaphragm of the device is compensated or bal
ed oxide'that may be reactivated and reused re~
Deatedly, Such a drying agent may have an ad-,
anced in whole or in part, for example, by gassee
Serption characteristic and, speci?cally, may he
ous pressure on the non-exposed side of the ,dia
silica gel.
phragm. The means enablingsuch pressure com,
A more complete understanding of this inven
pensation or balancing may involve a .COHIPret
tion will be derived from the detailed description
sible member, such as ‘a bellows or a collapsible
container or bag, adapted to be exposed in whole 15 that fellows, read with reference to the admin
panying drawings wherein!
or in part to the liquid medium, that is, to the
Fig. 1 is an elevational view of a submarine sig
water, the interior of the container being coupled
to or connected with the space or chamber ad
jacent the non-exposed side of the diaphragm.
If the material of the wcompressible member is to
any extent pervious to water, there will be a tend-v
ency for the water to diffuse er otherwise pene
trate therethrough and into the interior of the
signal device. with the attendant pessihiliiy ei
corrosive action tending to shorten the useful iife .9
of the device, or requiring more frequent removal
of the device from the water and its dismantling
for inspection. Not only may the liquid medium
?nd entrance into the device in this manner, but
the presumably water-tight joints of the struc- *»
ture may in time permit the entrance of some
water. In certain devices, also, the pressure bal
ancing action has been obtained. by using a flex
nal seureegproieeior or radiator in which the in
ventieii. may vbe embodied;
2 is ‘an elevational View of a fragment of
the device of Fig. ;l, partly broken away and part
ly in section to show structural details thereof;
vlii'ig. 3 is a cross-sectional view of the signaling
device included in the projector of Fig. ,1, along
the line $—3 of Fig. 1; and I
’
Fig. 4 illustrates a' container or enclosure for
a desiccant that has been found satisfactory'in
practicing this invention.
The present invention is disclosed with speci?c
reference to a submarine signal projector of the‘
general type disclosed in the pending application '
of L. G. Bostwiek and J. H. King, ‘Serial No, 445,
971i, filed June 5, 1942, for Electromechanical de
vice, and, more particularly, to a projector of
ible or distendable wall portion of a material,
such as rubber, through which the liquid medium 3.5 the type described in that application with par
ticular reference to Figs. 1 to 6, inclusive, of the
may in time, even though at a slow rate, ?nd in_
gress to the interior of the device.
A feature of the invention comprises provid
drawings thereof...
‘
iThelsig-nal wave source,- projector or radiator
IE] illustrated by Fig. 1 of the attached drawings,
ing a desiccant or drying agent in signal devices
used in a liquid medium.
40 comprises an energy radiating device or portion
H, a hydrostatic pressure compensating or bal
Another feature comprises employing as a des
ancing device or portion l2, and rigid means l3
iccant in such devices a material experiencing
interconnecting the devices ll, [2, whereby the
substantially no chemical or physical change in
projector comprises a unitary structure that may
the presence of water or water vapor.
be supported under water at the end of suitable
A further feature comprises the employment in
wires or cables I4 that may be secured to the
such devices of a desiccant of the adsorption type,
projections or ears l5 on the device l2.
Still another feature comprises utilizing in such
Fig. 2 of the attached drawings is an enlarged
devices a desiccant comprising a ?nely divided,
activated oxide capable of being reactivated and
detail of the device [2, and'a portion of the rigid
reused repeatedly.
50 interconnecting means l3, partly broken away
In accordance with this invention, an electro
and partly in section better to illustrate the struc
mechanical transducer comprising a hollow en
ture involved. The arrangement is substantially
closure for a transducer unit, and which enclo
the same as that of the Bostwick-King applica
sure includes a wall portion through which liq
tion except that in one respect the conductors 90
uid or liquid vapor, speci?cally, water or Water 65 for connecting the device ll with other electrical
2,404,786
4
3
equipment, are provided through a cable 90'. The
cable 96' is brought into the projector through a
water-tight gland or stuiiing box 98A, which may
substantially no chemical or physical change in
the presence of water. It may comprise a ?nely
contain a splice (not shown) a portion of which
gland is threaded into the cover member or plate
‘15'. The cover member is so shaped adjacent
vated and reused repeatedly. Such a material is
silica gel. This material may be included in the
the container 10 that a plurality of slitspr slots
16A are provided for the ingress of the liquid me
dium into the interior of the container 10. The
divided, activated oxide capable of being reacti
component designated 5, and shown in Figs. 3 and
4 of the attached drawings. The container, en
closure or carrier I for the desiccant 2 may com
prise a strip of woven material or fabric, such as
concentric inner pipe 66, and outer pipe 68, the 10 muslin, having a multiplicity of apertures or in
rigid casing or container ‘it, the valve coupler 15,
the valve 79, the metallic tubing 80, the union 8 I,
the pet-cock E4 and the compressible member,
container or bag ‘It may be similar in construction
terstices for the ready penetration of liquid or
liquid vapor, a portion of the material being fold
ed back on itself and sewed at its edges 3, 4 as
well as at a plurality of intermediate portions 6
and perform the like function to the correspond 15 to de?ne a plurality of pockets 7 to be ?lled with
the desiccant at least to the level indicated by the
ing components in the aforementioned BOStWiCK
dotted line. The ?ap portion 8 is adapted to be
King application. The compressible member 18
folded over the pockets so that it e?ectively closes
is of an elastic material, such as rubber, the in
the otherwise open ends thereof and, when the
terior 82 of which communicates through the
valve 19, tubing 80, the coupler ‘l5 and the pipe 55 20 component 5 is ?tted around the annular magnet
structure 25, is adjacent the latter. The desic
with the chambers iii, 1&2 and 62 of the device i I.
cant component 5 may be fastened to the magnet
The shape of the member 18 is shown such as it
structure by a tape or brush 9 secured in or to the
might assume when the projector H! is submerged
woven material, and tied together at its end por
under water and the latter has entered through
the slits 16A to ?ll the container space not occu 25 tions 9’.
Other desiccants, of course, may be used, but
pied by the member 78, and to fill the space be
silica gel has been found particularly satisfactory
tween the pipes £56, 68. The device H, as shown
with respect to the particular environment in
in Fig. 3 of the drawings attached hereto, is seen
volved. Although the invention has been dis
to be substantially the same as the device illus
trated in cross section in Fig. 3 of the aforenoted 30 closed with reference to a speci?c embodiment
thereof, it will be understood that this is believed
BostWick-King application, except that it embod
at this time to be the best mode of practicing the
ies the component 5 of which more description
invention, and is not intended to constitute a lim
hereinafter.
It has been ascertained that water or water Va
por may ?nd entrance to the interior of the pro
jector, particularly by di?usion through the ma
terial of the compressible member 78 into the
chamber 32 thereof, and through the tubing 80
and pipe 56 into the interior of the device H.
Such moisture may cause corrosion of the device,
particularly at the terminals, the coil leads and
l e
diaphragm
thereof.
Although
a
certain
itation upon the scope of the invention.
‘What is claimed is:
An underwater wave translating device com
prising a hollow container, a wave translating
unit including a diaphragm mounted in the Wall
of said container so that the outer side of said
diaphragm engages the water, a submersible hol
low chamber having an elastic wall pervious to
water, hollow means having a wall impervious to
water for interconnecting the interiors of said
container and said chamber, said container, hol
amount of such corrosion might be sustained by
the device without affecting its operativeness, in
the absence of any special provision limiting such 45 low means and chamber being ?lled with an in
ert gas, said chamber changing its volume in re
sponse to variations of hydrostatic pressure and
thereby varying the gas pressure on the inner
of the projector from its under-water location and ..
side of said diaphragm substantially to compen
the loss of its use during such operation. In ac
50 sate for the variations of hydrostatic pressure on
cordance with this invention, the aforementioned
the outer side of said diaphragm, and desiccating
hazard and precautionary inspections may be
means positioned interiorly of said container for
negative for the anticipated useful life of the pro
adsorbing water vapor passing thereinto as a
iector, or for the anticipated time of submersion
consequence of diffusion through said chamber
thereof, by including in the projector a suitable
55
wall.
desiccant or drying agent.
LEE G. BOSTW'ICK.
The desiccant may be of a material having a
effect, frequent dismantling and inspection would
be necessary, attendant with necessary removal
high coefficient of adsorption and experiencing
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