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z, 34a.
w- P- MASON
PLASTIC HOUS ING
Fileä may Y, 1943
2 Sheets-Shea?, 2
FIS. 3
INVEN TOR
W. R MASQ/V
ATTORNEY
" 2,434,666
` Patented Jan. 20, 1948 ~
UNITED STATE s PATENT oFF-ICE
2,434,666
rms'rro HOUSING
Warren P. Mason, yWest Orange, -N. J., assignor '
'to Bell Telephone Laboratories, Incorporated,
i New York, N. Y., a >corporation of New York
Application May 7, 1943, Serial No. 486,102
`1 claim. (ci. r11-¿386)
This invention relates to housings for electrical
apparatus and particularly to housings for elec
tor oil and housed in a plastic covering 4 having
the general shape of a chemical test tube. Since
it has been found that the castor oil and the plas
tic both have about the same transmission char
facteristics as sea water, this construction is-as
tromechanical transducers intended'for operation
beneath the surface of the sea.
The object of the invention is to produce a
nearly as> possible equivalent to immersing the
housing for a transducer which will introduce
the minimum hindrance to ultrasonic waves trav
transducer directly in‘sea water with the conse
eling inthe sea Water to or from the transducer. ' quent elimination of the usual losses entailed in
the transmission of compressional waves through
Due to the fact thatsuch transducers are im
mersed to considerable depth in sea water and 10 substances of varying characteristics.
’
that the device itself-must be protected against
In Fig. 2 a directional projector or hydrophone
the sea water, it is usual to place them in a hous
is shown. In this instance the main body of the
ing and immerse them in anon-‘corrosive medium
housing 5 may be made of any material'but the
such as castor 011,' Heretofore metallic housings
diaphragm 6 is made of a plastic having the same> Y
have been employed and in some cases small sized
transmission characteristics as the sea water ‘I
“windows” or diaphragms of material such as - and the castor oil B. A crystal 9 represents the
very thin steel sheets or fairly thick sheets oi’ soft ‘
transducer.
rubber have been provided. The metallic hous
In Fig. 3 there is shown a fragmentary section
ing, however, interferes with the proper trans
of a device intended to be placed in a stationary
mission of ultrasonic wavesA to and from the 20 position. A crystal I0 represents a transducer
transducer and hence it is desirable to employ
~and this with other apparatus is mounted in a
some other material having the requisite strength
cylindrical shell Il of metal having a plurality of
but free from the disadvantages of metal.
windows cut out. These windows, as well as a
Applicant has discovered that many plastic ma
layer over the outside of the shell, _are formed of
terials, transparent and otherwise, possess trans 25 ,a plastic I2 which has the same transmission
mission i. characteristics closely approximating
characteristics as the castor oil I3 in which the»
those of sea water. In this connection reference
apparatus is immersed and the sea water I4 which
is made to the book “Electromechanical trans
surrounds the assembly.
,ducers and Wave ñlters” by this applicant, pub
4 shows a streamlined device. The whole
lished in 1942 by D. Van Nostrand Company, Inc., 30 is Fig.
mounted
on a shaft I5 bywhich the projector
particular reference being made to the chart on
or
hydrophone
may be lowered or raised or ro
page 247 showing the results of` measurements of
tated in any desired position, The apparatus I6
certain plastics.
ï
represents the transducer which is immersed in
A feature of the yinvention is a housing for
an electromechanical transducer comprising a 35> castor oil I1 and covered by a housing I8, which
as before, is a' plastic of considerable mechani
plastic structure having transmission character
cal strength but -having practically the same
istics closely approaching those of water.
transmission characteristics as the castor oil I1
Other features will appearhereinafter.
and the sea water in which the whole is im
The drawings consist of two sheets having four
40
figures, as follows: ’
Fig. 1 is a view of a housing, partly broken
away to show a part of the housing in section
and the location of thetransducer;
-
mersed.
`
The nature of the plastics will be understood
by noting that materials- such as polystyrene, var
ious forms of methyl methacrylate, the vinyl chlo
ride acetate resins, cellulose acetate butyrate and
Fig. 2 is a side view of another form of trans
ducer housing, partly broken away to show the 45 certain .of the polyesters may be employed. Oflocation of the various pieces of apparatus ;
'
' Fig. 3 is a fragmentary sectionaly view of a
these the cellulose acetate'butyrate and the poly- -
esters give the closest match to. seaI water.
An alternative method which requires a smallerv
amount of plastic for the same strength is to
Fig. 4 is a perspective view, partly broken away 50 mold the plastic around an expanded metal frame
somewhat after the fashion Vshown in Fig.
of a streamlined housing.
'
3. The metal frame provides greater mechanical
' In Fig. 1 a mounting plate I is used as a base
to support a plurality of crystals 2 comprising an
strength, while still allowing free transmission
transducer and its housing of a diüerent form;
and
.
‘»
through the large openings in the metal which
electromechanical transducer. This assembly is
immersed in a non-corrosive ñuid 3 such as cas- 66 are nlled with sound transparent Plastics.
2,484,866
_,
4
3
What is claimed is:
.
UNITED STATES PATENTS
In combination, an electromechanical trans
ducer, non-corrosive liquid having the same im
pedance characteristics as water in which said
Number
for retaining said liquid, said housing being of a
plastic _and also having the same impedance
2,141,752
2,015,674
1,490,742
2,147,649
characteristics as water.
1,349,538
transducer is immersed and a. thin wall housing
'
WARREN P. MASON.
REFERENCES CHTED
The following references are of record in the
file of this patent:
Name
,
Date
Hoarle __________ __ Dec. 27.
Hayes _____________ __ Oct. 1,
Hull _____________ __ Apr. 15,
Haines ___i _______ -_ Feb. 21,
Blake ____________ __ Aug~ 3,
1938
1935
1924
1939
1920
FOREIGN PATENTS
10
Number
Country
Date
Great Britain ..... __ Feb. 14, 1929
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