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Патент USA US2410805

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Nov. 12, 1946.
R. BLACK. JR
4 2,410,805
VIBRÀTION DETECTOR
‘
Filed Jan. 16, 1942
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RFC.E5QU.NCY- _
Patented Nov. 12, 1946-
2,410,805
>UNIT-ED STATES PATENT OFFHCE
2,410,805
VIBRATION DETECTOR
Robert Black, Jr., South Orange, N. J., assignor to
Bell Telephone Laboratories, Incorporated, New
York, N. Y., a corporation of New York
Application January 16, 1942, Serial No. 426,989
3 Claims. (Cl. 177-386)
.
1
2
.
This invention relates to vibration detectors
Fig. 1 is a side view of a vibration detector em
and, more particularly, to such detectors used in
a liquid medium, for example, water, in the de- tection of noises, signal waves or other'under
water disturbances.
An object of the invention is to provide an
inexpensive, small and eilicient detector of under
water vibrations.
bodying the invention;
Fig. 2 is an end View of the device of Fig. l;
Fig. 3 is a cross-sectional view, enlarged, of the
device of Figs. 1 and 2 taken along the lines 3_3
of Fig. 2',
Fig. .4 is another cross-sectional view of the de
vice of Figs. 1 and 2 taken along the lines 4_4 of
Another object is to detect efñciently under
Fig. 3;
water vibrations with an inertia-type transducer, 10
Fig. 5 is a View in perspective of the inertia
device or unit.
type transducer, device or unit incorporated in
A feature of the invention comprises complete
the device of Figs. l and 2; and
ly surrounding an electromechanical transducer,
Fig. 6 illustrates the response characteristic of
device or unit for use in a, liquid medium, such
the device of Figs. 1 to 5 for vibrations incident
as water, with a body of ñexible, elastic or resil
15 normal to the cylindrical surface thereof.
ient material.
.
The vibration detector H00 of Figs. l to 5 is in
tended and adapted for the detection and trans
Another feature comprises detecting under
Water vibrations with an inertia-type device or
lation into an electric current of submarine sig
naling waves or other under-water disturbances
resilient material, such as a soft rubber, intimate 20 or vibrations. It embodies an inertia-type elec
ly adherent to the unit.
tromechanical transducer, device or unit substan
A further feature comprises an arrangement
tially the same as the telephonie device disclosed
for protecting the detector unit against water
in M. S. Hawley United States Patent No.
unit embedded in a body of ñexible, elastic or '
diffusion through the elastic body in which it is
2,202,906 of June 4, 1940, the principal diiferences
embedded.
25 being that the device l0 herein includes a pair of
In accordance with the invention, an inertia
set screws 50 threading through the pole-pieces
type electromechanical transducer, device or unit
I3, I4 and bearing at their rounded ends on the
is embedded in ka body of flexible, elastic or resil
spider memberl@ to enable adjustment of the air
ient material, such as a soft rubber. The trans
gap between the armature 23 _and the pole faces
ducer preferably comprises a container or case 30 of the arms l5, i6 of the pole-pieces; and in that
of relatively inflexible material to the cuter 'sur-,
the long or longitudinal edges 29’ of the cover 20
face of which the elastic material is intimately
of the unit I0 herein, slope or are contoured at
adherent. The body of flexible material may
an angle of approximately 45 degrees with respect
have a geometrically symmetrical outer surface
to the outer surface of the cover. More specifical
and, in a preferred embodiment, this outer con 35 ly, the device l0 herein comprises a pair of bar
tour may be cylindrical in character. Terminal
permanent magnets Il, l2; a pair of U-shaped
members are supported at the ends of the cylin
pole-pieces i3, Id whose inner arms l5, I6 are sur
drical body, and conductors are embedded in the
rounded by and support current coils l1, I8; an
elastic material for connecting the transducer
armature 23 fastened to and supported by a spider
with the terminals. In order to protect the trans 40 member 20, the spider member being secured to
ducer against the effect of possible water diffusion
the outer arms of the~ pole-pieces by screws 2l,
through the elastic body, the latter is enclosed in
28, spacer members or washers 25, 26 being in
a thin metallic sleeve or shield, the ends of which
terposed between vthe spider member and the
project beyond the ends of the elastic body where
pole-pieces. The magnet structure and the
by rigid, cup-shaped metallic members may be at 45 spider are enclosed by a case or container com
tached thereto. The electromechanical trans
prising casing 30 of relatively inflexible material
ducer may be an inertia-type bone conduction re
ceiver such as has been disclosed in M. S. Hawley
such as a plastic, and a 'cover member 29 of simi
will be evidenced by, and a more complete under
bushings embedded in the cover. The coils il,
I8 may be connected in series, their free ends
lar material, being fastened to and supported
' Patent No. 2,202,906 of June 4, 1940.
solely by the cover member, the fastening means
Other objects and features of this invention A50 comprising screws 3| threading into tapped
standing of it will be derived from, the detailed
description that follows, taken in conjunction
w" h the showing of the appended drawing, where
mi
-
being brought out to spring terminals adapted to
be engaged by pin or plug connectors 00. The
55 davide l0 is embedded in and completely sur
2,410,805
4
3
rounded by a body 10 of flexible, elastic or re
silient material, such as a soft rubber, the body
nested through suitable conductors with the ter
1|! being of an elongated, geometrically symmet
rical configuration, in the particular embodi
ment, cylindrical in outer contour with planar
The elastic material may be such that
the product of its density and the velocity of
originating from the directions faced by the cy
lindrical surface of the vibration detector, the
response characteristic will have the general
shape shown in Fig. 6. The vibration detector
propagation through it is substantially equal to
perature about 38° F. The abscissa is in cycles
per second, the ordinate is open circuit voltage at
minals 90. For vibrations, waves or disturbances
was located at a depth of ten feet in water of tcm
that of the liquid medium in which the device ||1|l
is to be used. 'I'he material of the body 10 is 10 the terminals in decibels down from one volt per
dyne per square centimeter. The signal source
intimately adherent to the relatively inflexible
casing and cover of the device ||l, being vul
was at a distance of onehfoot. The device |00 dis
canized therearound. The elastic body is en
crimlnates against waves, vibrations or disturb
ances originating from a direction faced by the
closed in a thin metallic shield or sleeve 80 whose
end portions 8| project beyond the planar ends 15 ends of the elastic body.
of the elastic body. This shield may be of elec
trotinned brass approximately .005 inch in thick
ness. Relatively rigid cup-shaped metallic mem
bers 15 are inserted Within the projecting ends
of the sleeve, are fastened thereto, for example, 20
by solder, and bear against the planar ends of
the elastic body. A terminal member 90 is sup
ported on an insulator member 9| at each end
of the elastic body, and is connected by a bare
The vibration detector described with reference
to the appended drawing may be included with
a plurality of similar vibration detectors in a
cable included in a submarine signal or vibration
detecting or locating system. A specific vibration
detector constructed in accordance with this in
vention was quite small and compact being of
the order of less than one inch in outer diameter
and approximately three inches in length.
Although this invention has been disclosed with
wire or conductor 92, 92’ with the plug or con 25
nectors 60. The wires 92, 92’ are brought out to
reference to a specific embodiment thereof, it
their respective terminals through a glass bead
will be evident that it is not limited thereto, but
93 supported in the tapered end of a. copper sleeve
is of a scope evidenced by the appended claims.
What is >claimed is.
.
94, the enlarged end 95 of which is spun over to
1. A vibration detector comprising a unitary
firmly grip the insulator member 9|, and is sol 30
assembly comprising a container including a. hol
dered to the member 15. The glass bead-copper
sleeve provides a water-tight seal for the con
low case of relatively infiexible'material and a
ductors, the elastic body being intimately adher
cover of similar material for said case, and an
ent to the outer surfaces of the glass bead and
electromechanical transducer within said case
35 and supported solely from said cover, and a body
copper sleeve.
of soft rubber completely enclosing said container
It will be observed that the unit l0 is a sub
stantially regular geometrical body of relatively
and intimately adherent to the outer surfaces of
said case and cover.
greater length than either width or thickness,
and that the elastic body is of substantially reg
2. A vibration detector comprising an inertia
ular geometrical configuration of considerably 40 type electromechanical transducer including a
greater length than diameter, the lengthwise di
case of relatively inflexible material, a body of
mension extending inithe same direction as the
relatively flexible material completely surround
lengthwise or longitudinal dimension of the de
ing said case and intimately secured thereto, said
body having a cylindrical outer contour, a thin
vice |0, with the thickness of the elastic body
material along the long or lateral surfaces of the 45 metallic sleeve attached to and surrounding said
unit l0 being small compared to the elastic body
body, a relatively rigid cup-shaped member at
material thickness at the ends of the device I0.
each end of said body secured to the latter and
When the vibration detector described is sub- l
fitting within the ends of said sleeve, a terminal
merged in a liquid medium, 'the sleeve 80 pro
member within each of said rigid members, and
tects the device l0 against. water diffusion 50 conductors embedded in said body and connecting
through the elastic body. The sleeve 8|] also acts
said transducer with said terminals.
to transmit signal waves, vibrations or other dis
turbances incident thereon to the device I0
3. A vibration detector comprising an inertia
type electromechanical transducer including a
through the material of the elastic body. The
case of relatively iniiexible material, a body of
vibrations so transmitted will vibrate the de 55 relatively flexible material completely surround
vice IIJ, and the relative movement of the arma
ing said case and intimately secured thereto, a
ture 23 and the pole-pieces |3, I4 will result in
thin metallic sleeve attached to and surrounding
a variation in the reluctance of the magneticA
said body, a relatively rigid, closure member at
circuit constituted by the permanent magnet,
each end of said body secured to the latter and
pole-pieces and armature, which variation' in re 60 fitting within the ends of said sleeve, a terminal
luctance causes a variation in the magnetic flux
member attached to each of said rigid members,
in the circuit, whereby currents corresponding to
and conductors embedded in said body and con
the vibration are induced in the coils l1, I8.
necting said transducer with said terminal. `
These currents may be detected by suitable indi
cating or recording equipment (not shown) con
65
ROBERT BLACK, Jn.
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