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Патент USA US2122328

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June 28, 1938.
w. J. SCHNELL
2,122,323 ‘
RADIO ‘TUNING INDICATOR
Filed May 15, 195"!
2 Sheets-Sheet 1
‘ Mum/Jihad
@” @211“ 7710020 @5:
June 28, 1938.
w, J_ SCHNELL
2,122,328
RADIO TUNING INDICATQR
Filed May 15, 1937
2 Sheets-Sheet 2
~ 2,122,328
Patented June 28, 1938
PATENT OFFICE
- UNITED STATES
4
.
2,122,328
aamo TUNING mnrca'roa
William J. Schneli, Berwyn, Ill., assignor to Elec
111.,
trical Research Laboratories Inc., Chicago,
a corporation of Illinois
Application May 15, 1937, Serial No. 142,864
8 Claims. (Cl. 116-124.1)
This application relates to a tuning indicator
for radio receivers and the like.
In present day receivers of the most expensive
' ed with a dial assembly 2 visible through an open
type, so-called automatic tuning aids operable
by various devices, such as telephone dials, push
buttons and the like, have been provided for the
purpose of facilitating tuning of the receiver
‘ in accordance with the call letters of a number
of the most usually selected broadcasting sta
10
tions.
-
It is an object of applicant’s invention to pro
vide a tuning‘ indicator for the small and inex
pensive class of radio ‘receivers, which tuning in-'
dicators shall be simple in construction, inexpen
sive in cost, and e?icient in operation.
15
A further object of applicant's invention is
to provide an inexpensive and e?icient marking
device ‘indicating the position to which the tun
ing element of the receiver should be moved to
tune the receiver to the station represented by
20 call letters inscribed on the marking device.
It is another object of applicant's invention to
provide a plurality of tabs adapted to be in
scribed with the call letters of any selected com
bination of broadcasting stations and inexpen
‘’ sive but eiiicient means to detachably mount said
tabs upon the dial of a radio receiver.
A further object of the invention is to provide
simplified inexpensive means operable in syn
chronism with the tuning element of the receiver
30 ' to give a selective indication of the station to
eraily rectangular in shape; is ‘somewhat larger
than the opening 5 and is provided with a pref
erably circular opening 9. The front surface of 15
the sheet ‘I is blackened to prevent the re?ection
of rays toward the glass plate 8. This plate 8
is of a size substantially equal to the sheet ‘I and
on its front face are etched one or more semi-cir
cular scales l0‘ marked with indicia representative 20
of one or more broadcast bands. The back sheet
1 and the glass plate 8 are secured to the frame
land held against outward movement by a plu
rality of clamps H. The clamps H are secured
to the rear of the frame 4, passing through re- 25
cesses I2 in the frame, and have portions l3
overlying the. corners of the glass plate 8.
A lamp It is mounted by a bracket 15 on the
upper edge of the frame 4 and a shield i6, sur
rounding‘ the lamp M, is provided with a longi- 30
tudinal slot I‘! in alignment with the glass plate
8. The lamp It serves as a means for diffusely
in a radio receiver, a plurality of marking de
A tuning condenser iii of any ordinary form 35
is mounted in the usual manner on the radio re
ceiver chassis I9 and on the shaft 20 of the tun
ing condenser there is mounted, by a collar 2|,
the receiver is tuned at any instant. ,
Numerous other objects and advantages will
be apparent from a consideration of the follow
ing speci?cation when taken in consideration
4 O with the drawings disclosing one form of a de
vice constructed in accordance with the princi
- ples of the present invention and in which
Fig. 1 represents a perspective view of a radio
embodying applicant's invention‘;
'
Fig. 2 and Fig. 3 are exploded views in per
' spective showing the various parts of the vmech
anism;
.
Fig.4isaviewofa
marking tab used in ap
plicant’s invention;
Fig. 5 is a vertical section taken along the line
5-5 of Fig. 6, and
55
sheet ‘I and a' glass plate 8. The sheet ‘I is gen
illuminating the scales ill by edge-lighting the
marking device representing the station to which
50
frame provide a shelf on which is supported a
which the receiver is tuned.
Another object of the invention is to provide,
- vices and means selectively illuminating the
45
ing in the front face of the cabinet, which open
ing, in the usual manner, is bounded by a dec
orative escutcheon 3. The dial assembly 2 com
prises a frame or supporting plate 4- bolted or 5
otherwise secured to the front panel of the radio
cabinet. The frame 6 is generally rectangular in
con?guration and is provided with a rectangular
opening 5. At the bottom of the opening a pair
of brackets 6, secured to the front face of the 10
Fig. 6 is a vertical section taken along the
line B-—5 of Fig. 1.
As shown in Fig. 1, a radio cabinet I is provid
glass plate 8.
.
_
a set screw 22 and a washer 23, a disc 24. The
disc 24 is made of any suitable transparent or 40
translucent material such as “Pyroxylin” and
is coated on its rear surface with an opaque ma
terial, preferably black, in such a manner as
to leave radially aligned transparent strips or
lines 25 in the coating. The disc 24, is operated 45
by a pair of fiber discs 26 carried on the inner
end of a shaft 21 which is operable by a knob
28. A lamp 29 is mounted by a bracket 30 on the'
collar 2| in alignment with the transparent
strips 25.
_
'
50
It will be apparent that'for the coated disc 24
there may be substituted a like disc of opaque
material having radially aligned slots allowing
passage of the light therethrough. .
-
A metallic plate 3| is secured to the frame I 55
2
2,122,828
in tight engagement with the glass plate 8 by be inscribed with indiciarepresentative ‘of a se- ,
suitable bolts 32 and spacers 83. Plate 3i extends . lected broadcasting station, said second plate
downwardly of the glass plate slightly more than
half way and is provided with a semi-circular
opening concentric to the upper scale Ill and in
wardly of the edge of the glass plate 8. The plate
having a plurality of resilient sections for fric
tlonally clamping said tabs between said ?rst
and second plates, a tuning element, means for
directing a concentrated beam of light upon said
3 Hs cut or notched radially at equal spaced points plates selectively to illuminate various lines of
to provide resilient sections 34 under which a‘ said scale and said tabs, and means for operat
marking tab 35 is adapted to be inserted and ing said directing means in synchronism with said
10 frictlonally held against the glass plate 8. The
tuning element.
‘
10
resilient sections 34 are bent forwardly at their
4. In apparatus of the character described, the
outer ends, as at 36, to facilitate the insertion of combination of a light transmitting plate, an ar
the tabs 35. The tabs 35 comprise transparent cuate scale visible through said plate, means for
, strips upon which there is or is adapted to be in
directing rays of light against said plate diffusely‘
15 scribed the call letters of desired broadcasting to illuminate said scale, a second plate and scale
stations.
'
in clamping engagement with said ?rst plate and
The frame 4 and associated parts are mounted having an opening concentric to said scale, and
on the chassis is by a bracket 31 fastened a plurality of marking tabs adapted to be in
to the rear surface of the frame 4 and secured scribed with indicia representative of a selected
20 to the condenser housing as by bolts 38.
The
bracket 31 is provided with a substantially semi
circular opening 39 forming a bearing for the
shaft 20 of the condenser.
In use, tabs 35 are prepared by inscribing the
25 same with the call letters of the most frequently
selected broadcasting stations; the receiver is
tuned in turn to these stations and the tabs are
in turn inserted under the lips 36, being pressed
between the resilient sections 34 of the plate 8|
80 and the glass plate 8 in alignment with the illumi
nated transparent slits or strips 25.
It will be seen that applicant has provided a
radio receiver having a plurality of marking de
vices, and has provided means for selectively illu
minating the marking device representing the
station to which at any instant the receiver is
tuned.
Changes may be made in the form, construc
tion and arrangement of the parts without de
40 parting from the spirit of the invention or sacri
?cing any of its advantages, and the right is
hereby reserved to make all such changes as fairly
fall within the scope of the following claims.
The invention is hereby claimed as follows:
1. In apparatus of the character described, the
45
combination of dial means comprising a light
transmitting plate and a scale visible through said
plate, a second plate in clamping‘ engagement
with said ?rst plate and having an opening
50 through which said scale may be viewed, and a
broadcasting station, said second plate having a 20
‘plurality of resilient sections for frictlonally
clamping said tabs between said ?rst and second
plates, a tuning element, a driving shaft for oper
ating said element, luminous means carried by
said shaft, a shutter carried by said shaft and in 25
terposed between said plate and said luminous
means for directing a concentrated beam of light
from said luminous means upon said plate selec
tively to illuminate various ones of said tabs in
accordance with the position of said tuning 'ele 30
ment.
5. In apparatus of the character described, the
combination of a translucent plate, an arcuate
scale marked on one surface of said plate, means
for directing rays of light against said plate dif 35
fusely to illuminate said scale, a second plate in
clamping engagement with said ?rst plate and
having an opening concentric to said scale, and
a plurality of marking tabs adapted to be in
scribed with indicia representative of a selected 40
broadcasting station, said second plate having a
plurality of resilient sections ‘ for frictlonally
clamping said tabs between said ?rst and sec
ond plates, a tuning element, a driving shaft for
operating said element, luminous means carried 45
by said shaft, a transparent disc having an opaque
coating with an opening in said coating forming
a transparent strip in alignment with said lumi
nous means, said disc being carrled by said shaft
and interposed between said plate and said lumi 50,
plurality of marking tabs adapted to be inscribed
with indicia representative of selected broadcast
ing stations, said second plate having a plurality
of resilient sections for frictlonally clamping said
55 tabs between said ?rst and second plates.
2. In apparatus of the character described, the
nous means for directing a concentrated beam of
light from said luminous means upon said plate
selectively to illuminate various lines of said scale
and various ones of said tabs in accordance with
combination of dial means comprising a light
combination of a translucent plate, an arcuate
scale marked on one surface of said plate, means
transmitting plate and a scale visible through
said plate, a second plate in clamping engage
80 ment with said ?rst plate and having a semi
circular opening concentric to said scale, a plu
rality of marking tabs each adapted to be in
scribed with indicia representative of a selected
broadcasting station, said second plate being ra
65 dially slit at equally spaced points to form a plu
rality of resilient sections for frictlonally clamp
ing said tabs between said ?rst and second plates.
3. In apparatus of the character described, the
combination of a translucent plate, an arcuate
70 scale marked on one surface of said plate, means
475
for directing rays of light against said plate
di?usely to illuminate said scale. a second plate
in clamping ‘engagement with said ?rst plate
and having an opening concentric to said scale,
and a plurality of marking tabs each adapted to
the position of said tuning element.
'
6. In apparatus of the character described, the
for directing rays of light against the edge of
said plate diffusely to illuminate said scale, a sec 60
ond plate in clamping engagement with said ?rst
plate and having an opening concentric to said
scale, and a plurality of marking tabs adapted to
be inscribed with indicia representative of a
selected broadcasting station, said second plate
having a plurality of resilient sections for fric
tlonally clamping said tabs between said ?rst and
second plates, a tuning element, a driving shaft
for operating said element, luminous means car
ried by said shaft, a disc having a narrow radial 70
slot in alignment with said luminous means, said
disc being carried by said shaft and interposed’
between said plate and said luminous means for
directing a concentrated beam of light from said
luminous means upon said plate selectively to 75
illuminate various lines of said scale and various
8. Means for detachebly securing a. plurality
oi’ marking tabs to ‘the dial cover plate of s mdio
ones of said tabs in accordance with the position . receiver, comprising a. plate adapted to be pieced
of said tllnilm element.
~
‘ 7. Means for detachably securing a plurality
of marking tabs to the dial cover plate of a. radio
receiver, comprising a, plate adapted to be placed
in clamping engagement with the cover piste,
ssidplate having a. plurality of resilient sections
for triotlondlly clamping said tabs between said
10 plate and the dial cover plate.
in clamping engagement with the cover plate,
said plate being radially slit at equally spseed
points to form a. plurality of resilient sections
for friotionelly clamping the marking tabs be
tween seid plate and the dial cover plate.
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