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.n. c.. BLAuvELT
PORTABLE APPARATUS.
Fuga April 12,'.1945
" ~ ‘2,406,583
Patented Aug. 27,( 1946
2,406,583
UNITED STATES PATENT OFFICE
2,406,583
PORTABLE APPARATUS .
Ralph C. Blauvelt, Lakewood, Ohio, assîgnor Vto
Zenith Radio Corporation, a corporation of
Illinois
Application April 12, 1943, Serial No. 482,676
20 Claims.
(Cl. 179-,107) .
2
1
bythe hearing aid is deenergized when it is re
moved from operating position on the person.
The features of my invention which I believe
to be novel are set forth with particularity in the
This invention relates to portable electrical ap-V
paratus, and more particularly to such apparatus
which may conveniently be carried about upon
the person for the reproduction of sound.
In an electric hearing aid it is necessary to re
appended claims. My invention’itself, both-as to
plenish the electric batteries which furnish its
operating current at periods which are length
ened by carefully controlled use of the hearing
its organization and manner of operation,Y togeth
er with further objects and advantages thereof,
may best be understood by reference to the fol
lowing description taken in connection With the
aid, and which are shortened when the user for
gets to turn 01T the operating current of the hear 10
ing aid, as at times when he removes the hearing
accompanying drawings in which:
aid from his person'.
embodiment of my invention;
‘
Frequentchanging of batteriesis very costly, an
annoyance, and at times the person may be de
prived of the use of his hearing aid without much
warning. This is especially so when the batteries
are allowed to energize the hearing aid during
.
-
Figure 1 is a schematic circuit diagram of one
-
Figure 2 is a view in front elevation of a portion
of a hearing aid apparatus embodying my inven
^
tion;
,
>
Figure 3 is a View in elevation of the principal
parts of an alternative form of hearing aid em
bodying my invention;
the time the user is sleeping. Frequently one for
Figure 4 is a View in elevation of a radio re
gets to turn oiî his hearing aid at the time when
‘
one undresses and is later embarrassed to und 20 ceiver embodying my invention;
Figure 5 is an enlarged view of a portion of the
his battery in a poor and weakened, or a com
pletely discharged, condition.
One tends to be
more forgetful as one becomes tired and there are
apparatus illustrated in Figures 2 and 3;
Figure 6 shows the internal portion of the ap
paratus of Figure 2; and
^
~
frequent instances where one is quite forgetful
Figures 'l and 8 show alternative forms of
when one retires for the night, bathes or changes 25
clothes. It is therefore of importance that all
precautions be taken to insure long battery life
not only when the hearing aid is in use but also
when the hearing aid is in a condition of non-use
and should be deenergized.
`
An object of this invention is to provide a new
and improved hearing aid wherein the batteries
are conserved.
ì
Another object of this invention is to provide
new and improved electrical apparatus with
means for conserving the life of the power supply
associated with such apparatus.
Another object of this invention is to provide
switches like that shown in Figure 5.
‘
In Figure 1 there is shown a hearing aid circuit
including a microphone II'! connected between the
main control grid and cathode of the pentode type
amplifier device II. Resistance I8 connected in
parallelto microphone Iû serves to provide a con
nection for flow of continuous current between
grid and cathode of ampliñer device II. Ampli
ñed signals appearing across resistance 22 con
' nected between the anode of device Il and the
» positive terminal of source I‘l of operating poten
tial are applied to the main control grid of pen
tode type amplifier device I2 through capacitance
23.
The negative terminal of source I1 is con
new and improved electrical apparatus with 40 nected through switches 26 and 2l to the cathode
of device I I. A resistance I9 is connected between
the main control grid and cathode of amplifier
ratus.
'
device I2 to provide a path for continuous cur
Another object of this invention is to provide a
rent therebetween.
new and improved housing for a hearing aid and
Amplified signals appearing across resistance
like apparatus whereby a longer life of the asso
I9 are further amplified by ampliiier device I2.
ciated batteries is assured.
'
The output circuit of ampliñer device I2 com
Another object of this invent/ion is to provide a
prises serially connected resistance I4 and source
means for energizing or deenergizing the appa
ratus depending upon the position of the. appa
position responsive hearing aid.
Il, sound reproducing device I3 being connected
Another object of this invention is to provide 50 in parallel to the resistance I4 through a voltage
position responsive hearing aid apparatus which
dividing connection whereby any desired frac
assures a deenergization of the apparatus when
tion of the voltage appearing across resistance I4
the apparatus is placed in a non-use position.
may be applied to sound reproducing device I3.
`Another object of this invention is to provide
Capacitances 24 and 25, connected between thel
new and improved means in a hearing aid where
Vscreen electrodes and cathodes, respectively, of
2,406,583
3
amplifier devices II and I2, serve as a low im
pedance path for high frequency current flow
between the screen electrode and cathode of each
amplifier device.
4
The lbatteries for energizing the hearing aid are
enclosed in a housing or pack 32 having a round
ed outer bottom surface 33. A portion of the
battery housing 32 is broken away to show a
Inductance £5, connected in parallel to the Cu mercury switch 34 which may be utilized instead
voltage dividing resistance I4, serves as a low re
of the position responsive switch 29 of Figure 2.
sistance path for the flow of the continuous cur
rent component of anode current in amplifier
When switch 313 in battery pack 32 is utilized, the
switch 29 >in housing 28 may be omitted, but since
the battery pack 32 is usually carried below a per
son’s hips a position responsive switch in housing
device I2 and as a high impedance for currents
of voice frequency.
The filamentary cathodes of amplifier devices
28 is preferred over the utilization of such a
I I and I2 are connected in parallel with one an
switch in battery pack 32.
other and are heated by current flowing from
source I6 of filament current through switches
25 and 21.
Source I1, which is a dry cell type battery and
shown in Figure l are, in the modification of
All of the elements
Figure 3, housed in housing îii’save the batteries
I6 and I1, position responsive switch 3d and re
producer I3. The battery pack or housing 32
has a rounded outer bottom surface 33 so as to
is connected in series through resistances 29, 2|,
assure that the pack 32 assumes a circuitl open
22, I4 and inductance I5 between the anode and
ing position for mercury switch 313 when the hous
cathode of each of the amplifier devices II and
I2, supplies discharge current to those ampliñer 20 ing 32 is removed from the person and placed
upon a dat surface, such as a table top or the
devices through switches 25 and 21 and through
like.
Connecting wires or leads 35 and 36 of sound
reproducing element I3 and batteries I6 and I1,
connected through voltage dropping resistance 20
to the positive terminal of source I1. whereby it is 25 respectively, are connected with the amplifier unit
supplied with discharge current. Similarly, the ' in housing 28 by connecting plug 31, which is de
tachably secured by conventional means in plug
screen electrode of amplifier device I2
sup
opening 3B in housing 28 with a portion of the
plied with discharge current through voltage
plug protruding as shown in Figure S.
dropping resistance 2| from the positive terminal
It is readily seen that when plug 3l' is inserted
of source I1. These two screen electrodes are 30
in the housing 28 a portion of the plug 31 pro
maintained at cathode potential for alternatingr
source I5.
The screen electrode of amplifier device II is
jects and provides assurance that a position re
sponsive switch similar to switch 29 shown in
Opening of either switch 25 or 21 causes the
Figure 2 will assume an open circuit position when
hearing aid to be deenergized. Switch 25 is a
manually operated switch and switch 21 is a no 35 housing 28 is placed upon a flat surface such as
a table top or the like. The housing 28 is pro
sition responsive switch. The various position
vided with rounded portions to further assure an
responsive switches disclosed herein are repre
assumption of the open circuited position of
sented in the circuit in Figure 1 by the switch
switch 21 when the housing 28 is placed upon a
21. In some situations, for instance, where thel
flat surface.
capacitances 24 and 25 have a relatively low re
’ Figure 4 shows a portable pocket size radio re
sistance, it may be desirable also to open the
ceiver 39 having more or less conventional cir
circuit of the battery I1 in order to prevent undue
cuits but being without batteries and sound re
leakage through the series circuit comprising bat
currents by capacities 24 and 25, respectively.
tery I1, resistance 20, 2|, capacitance 24. 25, the
two iilamentary cathodes. and battery I6. Ex
cept for such leakage current through condensers
24 and 25, which is generally negligible, no dis
charge current ñows when the filament circu-its
are opened rby either switch 2S or 21.
A tone control is also provided in the hearing
aid circuit, Figure 1. The tone control comprises
a plurality of capacitances 19 and 1I, each of
diiïerent magnitude and each of which may be
connected in parallel with grid input resistance
I9 by actuating the selector switch 46.
producing unit and having plug openingl ¿i9 adapted
to receive plug 31 with leads 315 and 36 of the
apparatus shown in Figure 3. A pocket holding
clip 4| similar to pocket holding clip 3| main
tains the apparatus in upright and circuit clos
ing position when a mercury position responsive
switch is mounted therein in the manner shown
in Figure 2. It is readily seen that such a radio
receiver 39, as well as other portable electric ap
paratus, may be utilized with my invention in the
same way as the hearing aid unit in housing 28.
Figure 5 is an enlarged view of the mercury
tion of the hearing aid apparatus when in oner
switch shown in Figure 3. The electrical switch
contacts 42 and 43 are bridged by mercury 44.
ating position.
Annuler ring shaped member ¿55 prevents undue
Figure 2 is a view in front elevation of a por
A portion of the housing 28 is
splashing of the mercury and consequent switch
with electrode 3D in circuit closing position. The 60 opening when the person carrying the hearing
aid in operative position walks, runs or moves
other electrode is identical to electrode 39, but
suddenly.
`
being back of electrode 30 is obscured thereby.
Figure 6 shows the operating unit chassis 'I0 re
Clip 3| is fastened to housing 28 and is adapted
moved fronr housing 28 (Fig. 2) and includes
to engage wearing apparel of the user. In the
mounting arrangements for pentode amplifier de
preferred embodiment of this invention, a posi
vices |I and I2, position responsive mercury
tion responsive switch, such as mercury switch 29,
switch 29, microphone recess Iila, volume control
is mounted in the housing 28. rl‘his is preferred
because housing 28 is usually carried above the
M, on-off switch 2E, a tone control switch 46, in
ductance I5, and associated resistors and capac
hips of a person and thus is subjected to the least
amount of movement from a vertical or circuit 70 itors, as shown in Figure 1.
Figure 7 shows a modified form of position
closing position while the hearing aid is in use.
responsive switch. The switch contacts 50 and
Figure 3 shows my hearing aid apparatus in
broken away so as to disclose mercury switch 29
operative position for amplifying sound imping
ing on a microphone III (Fig. 1) mounted in
5I are bridged by a flexible metallic member
52, which is held at one end in a projection 53
housing 28 in a recess Iûa in chassis 10 (Fig. 6). 75 forming part of housing 2B, and which carries a
2,406,583
5
.
Weight 54 at the other end. This pendulum
type switch is shown in circuit closing position.
As the upper end of housing 28 is rotated clock
wise about itsv lower end, contact 50 becomes
separated from contact with flexible member 52;
and, as the upper end of switch housing 28 is ro
tated counter-clockwise about its lower end, iiex
for the reproduction of sound, and means inde
pendent of the position of the receiver and re
sponsive to the orientation of said hearing aid
case with respect to earth for deenergizing said
i hearing aid in spite of said ñrst means.
3. In combination, a hearing aid having a
small, Wearable case enclosing a microphone con
.ible member 52 becomes separated from both
nected with an electrical circuit, a receiver, and
means independent of the position of the receiver
contacts 5i) and 5l. In either case the switch
shown in Figure 7 will be in open circuit posi 10 and responsive to the orientation of the hearing
tion whenever the housing 28 is displaced from
aid with respect to earth for interrupting said
the vertical position shown in Figure 7.
electrical circuit.
Figure 8 shows another pendulum type switch
4. In combination, a hearing aid having a
which is a further modiñcation of the position
small, wearable case enclosing a microphone, a
responsive switches heretofore disclosed. In 15 receiver, iiexible leads only extending between
this switch the electrical contact members 60
said >case and receiver, and an electrical switch
and 6I become separated when the housing 28
mounted in said case and responsive to the
is displaced from the vertical position shown,
orientation of the hearing aid case with respect
due to displacement of the pendulum 64 about
to earth, whereby said switch may be actuated
pivot 65. Cross member 66 havingv friction 20 without moving said receiver.
means thereon such as an indentation or raised
5. In combination, a hearing aid having a
portion 61, in cooperating relationship with a
small, wearable case enclosing a microphone, said
projection or indentation on pendulum 64, main
case being normally worn on the person with a
tains the contacts 60 and 6l in contact for slight
variations of the housing 28 from the normal ver
tical position shown.
It is to be particularly noted that the battery
housing 32 in Figure 3 is purposely made with
predetermined orientation with respect to earth,
a receiver, flexible leads only extending between
said case and receiver, an electrical switch mount
ed in said case and responsive to the orientation
with respect to earth of the hearing aid, means
a rounded bottom surface 33 in order that the
for holding said switch in circuit closing posi
housing when placed on a flat surface such as a ‘i 1 tion when the hearing aid is-worn in normal
operative position, and means on said case for
table top or the like will assume a position cor
allowing tipping of said case over to a position
responding to the electrical circuit opening posi
other than said operative position when the hear
tion. It is also to be noted that the same result
ing aid case is placed upon a flat >surface in oper
is produced when the housing 28 contains a posi
ative condition, whereby said switch may be
tion responsive switch similar to switch 2'9 and is
actuated without moving said receiver.
placed on> a íiat surface, since the bottom rof
6. In combination, a hearing aid, position re
housing 28 is rounded and further since plug 31
sponsive means carried on the hearing aid for
(Fig. 3) protrudes from the bottom of housing 28.
energizing said hearing aid, a small wearable
As seen from Figures 3 and 4, this invention
is not only useful with portable, wearable hear io housing for said hearing aid, a receiver, flexible
leads only extending between said receiver and
ing aids, but also is useful with wearable appa
housing, and means on said housing for allowing
ratus for the reception of radio waves and their
tipping of said housing over to place said hear-V
reproduction. Thus, this invention may be ap
plied to any wearable electric apparatus where 45 , ing aidin an inoperative position when the hear
ing aid is placed upon a flat surface in operative
it is desirable to conserve the life of the batteries.
position, whereby said position responsive means
It is however preferred in wearable hearing aid
may be actuated independently of the position
devices and finds great use in such devices.
`
of said receiver.
f
The position responsive switches disclosed
’7. In combination, a hearing aid housing hav
herein are shown in various portions 0f the port
ling a rounded outer surface, a receiver, 'iiexible
able electrical apparatus shown in the drawings.
leads only extending between said receiver and
Other dispositions of the position responsive
housing, and means independent of movement of
switches are readily suggested in view of this
said receiver and responsive to an orientation of
disclosure. For instance, Athe mercury switch 29
vsaid
housing with said rounded outer surface at
may be mounted on the sound reproducing unit 55
a lower extremity of said housing for energizing
I3 or one one or more of the leads 35 and 35.
the electric circuit within said hearing aid hous
While I have shown and described the particu
mg.
,
lar embodiments of my invention, it will be ob
` 8. In hearing aid apparatus, a hearing aid
vious to those skilled in the art that changes and
modiñcations may be made without departing 60 housing having a rounded outer surface, a re
ceiver, ñexible leads only extending between said
from my invention in its broader aspects, and I,
receiver and housing, means for energizing the
therefore, aim in the appended claims to cover
hearing aid, and means independent of move
all such changes and modiñcations as fall with
ment of said receiver and responsive to any
in the true spirit and scope of my invention.
orientation of said housing, except that with said
I claim:
65 rounded outer surface down, for deenergizing the
l. In combination, a hearing aid having a
hearing aid in spite of said energizing means.
small, wearable case enclosing a microphone, a
9. In combination, a small, wearable hearing
receiver, flexible leads only extending between the
aid case and a small, wearable battery associated
case and receiver, and means responsive to the
therewith, a receiver, and means independent of
orientation of said hearing aid case with respect 70 movement
of said receiver and responsive to the
to earth and independent of the position of said
orientation with respect to earth of said hearing
receiver for energizing said hearing aid.
aid for disconnecting said battery from said hear
2. In combination, a hearing aid having a
ing aid.
~
small, wearable case enclosing a microphone, a
10. In combination, a small wearable hearing
receiver, means for energizing said hearing aid 75 aid housing carrying a lower projecting portion,
2,406,583
. 8
a receiver, fiexible leads only extending between
said housing and receiver, and means independ
ent of movement of said receiver and responsive
to orientation of said housing with said project
v
means responsive to thev position of said housing
and independent of the position of said repro
ducing device for rendering the first mentioned
means ineffective.
'
ing the hearing aid in said housing, said project
17. In combination, small wearable portable
electrical apparatus for reproduction of sound,
ing portion assuring an assumption of a position
an amplifier device having a cathode and an
other than an operative position with said pro
jecting portion downward when the hearing aid
anode, a small wearable housing enclosing said
apparatus and ampliíier device, a sound repro
housing is placed upon a flat surface.
l1. In combination, a small, wearable hearing
aid housing, an electrical switch mounted on and
device to said apparatus, a source for supplying
heating current to the cathode, a source for sup
ing portion other than downward for de-energiz
responsive to the position of the hearing aid
housing, a receiver, flexible leads only extending
ducing device, leads connecting said reproducing
plying current to the anode, and a single switch
actuated in response to the position of the hous
between said receiver and housing, means for 15 ing for rendering at least one of said sources in
holding the housing and switch in circuit closing
position when the hearing aid is carried in nor
mal operative position, and means on said hous
ing assuring assumption of a position other than
eiîective, and means vrfor delaying the opening of
said switch when the position of the housing is
less of the position of said receiver.
i2. In combination, a small, wearable electrical
apparatus for reproduction of sound, a sound re
apparatus, a mercury switch, a small wearable
changed gradually.
18. In combination, small wearable portable
said operative position whenever said housing is 20 electrical apparatus for the reproduction of
sound, an electrical circuit incorporated in said
placed upon a substantially flat surface regard
housing enclosing said apparatus, circuit and
mercury switch, a receiver, flexible leads only
producing device, leads connecting such sound 25 extending between said receiver and housing, said
switch being actuated in response to the position
device to said apparatus, a small wearable hous
of the housing and independent of the position of
ing enclosing said apparatus, and means respon
said receiver for interrupting said electrical cir
sive to the orientation of said housing and inde
cuit, and time delay means allowing operation of
pendent of the position of said reproducing device
for rendering said electrical apparatus effective. 30 the mercury switch only after a limited time
when the position of the apparatus is changed
13. In combination, a small wearable electrical
gradually whereby said switch operates with time
apparatus for reproduction of sound, a sound re
delay and independently of the position of the
producing device, leads connecting such sound
receiver.
device to said apparatus, a small wearable hous
19. In combination, a small wearable portable
ing enclosing said apparatus, means for render-_ 35
ing said apparatus effective for the reproduction
electrical apparatus for the reproduction of
of sound, and means responsive to the orientation
sound, an electrical >circuit incorporated in said
apparatus, a pivotally mounted weighted mem
of said housing and independent of the position
of said reproducing device for rendering said last
la. In combination, a small, wearable portable
electrical
apparatus
for
the
ber, a small, wearable housing enclosing said
40 apparatus, circuit and weighted member, a sound
mentioned means ineñective.
reproduction
of '
sound, a sound reproducing device, leads con
necting such sound device to said apparatus, a
reproducing device, leads connecting said repro
ducing device to said apparatus, said weighted
member being pivotally mounted in the housing
such that the relative position of said member
small wearable housing enclosing said apparatus, 45 with respect thereto is determined by the posi
tion of the housing, and electrical contacts mov
an electrical circuit incorporated in said housing,
able with the weighted member for interrupting
and means responsive to the orientation of the
the circuit.
apparatus and independent of the position of said
20. In combination, a small, wearable electrical
reproducing device for interrupting said electrical
50 apparatus for the reproduction of sound, an elec
circuit.
trical circuit incorporated in said apparatus ar
15. In small wearable portable electrical appa
ranged to supply current to said apparatus, a
ratus, a small wearable housing for said appa
switch in said electrical circuit arranged to in
ratus, a sound reproducing device, leads connect
terrupt the current flow to said apparatus, a
ing said apparatus to said device, a battery, means
for energizing said apparatus with current from 55 small, wearable housing enclosing said apparatus,
circuit and switch, the operation of such switch
said battery, and position responsive means in
being responsive to the orientation of said hous
said housing independent of the position of said
ing with respect to earth, and time delay means
reproducing device for rendering said first men
tioned means ineffective.
associated with said switch for allowing an in
16. In combination, small wearable electrical 60 terruption of said electrical circuit only a short
time after said housing is moved to a position
apparatus, means for energizing said apparatus,
corresponding to circuit opening position, where
a small wearable housing enclosing said appa
by said switch has a delayed action.
ratus, a sound reproducing device, leads connect
RALPH COE BLAUVELT.
ing said reproducing device to said apparatus, and
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