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Патент USA US2130836

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Sept. 20, 1938.
E. G. BRADSHAW
2,130,836
DIAL TUNING DEVICE
Filed Oct. 4, 1937
V
72%
Patented Sept 20, 1938
'
2,130,836
’ UNITED STATES PATENT OFFICE
2,130,836
DIAL TUNING DEVICE
Edwin G. Bradshaw, Chicago, Ill., assignor to
Wells-Gardner & Company, Chicago, 111., a cor
poration of Illinois
Application October 4, 1937, Serial No. 167,222
5 Claims.
(01. 74-10)
An object of this invention is to provide an _ to rotate therewith. This spider has spaced arms
0.
improved and simpli?ed form of tuning device
of the general type now referred to as telephone dial tuners. Such a tuner has a relatively large tuning dial which is operatively connected to a tuning condenser of a radio receiving set so that as the dial is turned it will rotate a gang condenser which controls a plurality
of stages of tuned radio frequency.
A telephone dial of this character has a series
of depressions each one of which more or less
roughly corresponds to asetting of the condenser
we and has on its periphery a dial of Bakelite
or the like 20 having a series of depressions 2|
all preferably at an equal distance from the
center. One of these has been omitted to per- a
mit insertion of a zero mark showing the ends
of the swing of the disc, and a stop 20a is sup
plied at this point. It will be noted that the
bottom of each one of the depressions 2| carries ,
a disc 22 and is held in place and protected by '10
means of a disc 23 of a clear transparent mate
rial Such as Celluloid Which also Provides a
for a given radio broadcasting station when said
depression is brought to a predetermined position of the dial, usually its lowermost position.
It is‘an object of the present invention to simplify a dial tuner of this type and at the same
time to render the tuning of a given station
smooth bearing for the operator’s ?nger. If
these become scratched or worn, they can read
ily be replaced. Each disc 22 may be marked ‘15
With the call letters of a desired radio broad
casting station whose position is nearest that of
that particular depression when the latter is at
rapid and accurate.
the bottom of its swing as shown in Figs. 1 and 2.
1
I
These and other objects, as will hereinafter
A knob 24 is mounted on a shaft 25, the latter '20
appear, are accomplished by this invention,
which is fully described in the following speci~
being rotatably and slidably mounted in suit
able bearings as H3 and Hb in the frame ll.
?cation and shown in the accompanying drawing, in which;
'
Fig. 1 is a partial front elevation of a radio
receiving set showing one form of a dial tuner
The shaft 25 is provided with a collar 26 se
cured thereto and pressed normally against the
bearing Hb by means of a compression spring 25
21. The knob 24 is provided with a rubber wash
embodying the present invention;
Fig. 2 is a partial vertical section on the bro_ ken line 2-2 of Fig. 1 showing the connection
between the dial tuner and the gang condenser
which it controls with an operator’s ?nger in
place in the ?rst step of roughly tuning a desired station;
Fig. 3 is a similar view showing the operator’s
' hand completing the tuning operation by means
of a, ?ne adjusting knob;
Fig. 4 is a front elevation of the same; and
Fig. 5 is a view similar to Fig. 3 showing a
modi?ed form of the device in which the ?ne
adjustment is performed by the operator’s index ?nger while in the depression in the tuning dial,
The embodiment illustrated in Figs. 1 to 4
comprises a radio receiving set having a chassis
er 28 or the like which is adapted to bear against
the outer circular edge of the casting 20.
A usual hand tuning knob 29 is likewise jour
naled in the frame II and has a sheave 30 act- 30
ing through a flexible Wire drive 3| with a sheave
32 on the sleeve [6 for manually tuning the ra
dio set in a well known manner.
The front of the radio set includes an annular
escutcheon 33 which overlies the outer edge of 35
the greater portion of the casting 20 so as to
DI'OIJQIIY ?nish the Same.
The center of the dial 20 is open to receive a
disc 34 Which is Opaque and graduated On its
outer portion while the inner portion 35 is trans- 40
parent- This disc is retained by a Snap ring 36
Back of the transparent center lies an opaque
plate 31 which is supported on the stud l8. It is
opaque except for the transparent arrow 38
frame I0 above which is mounted in any desired
manner, not herein shown, a metal frame H
in which is suitably journaled a shaft I2 of a
gang condenser l3. A gear M on the shaft [2
which serves as a marker for the graduated scale ‘15
on the disc 34. A translucent sheet of paper or
the like 39 is placed inside the arms of the spider
to diffuse the light and thus prevent shadows
meshes with a pinion l5 (preferably having
slightly more than one-half of the number of
teeth of the gear M) on a, sleeve I6 which is
rotatably mounted on a stud l7 secured at [8
to the frame H.
The sleeve I6 carries at its forward end a
spider H! which is ?rmly secured thereon so as
being cast thereby when the dial is illuminated
by lamps 40.
50
The operation of this device is as follows: with
the tuning dial having depressions some of which
are marked with the call letters of the station
to which they correspond, the operator selects
one such station which he desires to tune. He 55
2
2,130,836
then inserts his ?nger in that particular depres
sion and turns the disc until that depression as
2P1 is at the lowermost position as shown in Figs.
1 and 2.
This he can determine even in the dark
by the fact that his ?nger in this position is rest
ing on the top of the knob 24. It may happen
that in this position the dial will be sharply
tuned;
If so, he can withdraw his ?nger and
permit the set to stand in that position.
If, how
10 ever, he desires to tune the set more sharply,
he will withdraw his ?nger, as shown in. Fig. 3
and use his hand which is already set to grasp
the knob 25 to press the latter in until the rub
ber Washer 28 engages the circular periphery of
15 the casting 20 at which time he can slowly turn
the knob 24 until the set is sharply tuned in for
that desired station. Owing to the fact that
the knob 24 is much smaller than the diameter
1; In a radio receiving set, a tuning condenser,
a tuning dial operatively connected thereto, said
dial having a series of depressions adapted to re
ceive the ?nger of an operator, and a knob
mounted adjacent the dial so that when the
operator’s ?nger is in a depression, it can rest
on the knob to assist in tuning.
2. In a radio receiving set, a tuning condenser,
a tuning dial operatively connected thereto, said
dial having a series of depressions adapted to 10
receive the ?nger of an operator, and a knob
rotatably mounted adjacent the dial so that
when the operator’s ?nger is in a depression, it
can rest on the knob to assist in tuning.
3. In a radio receiving set, a tuning condenser, 15
a tuning dial operatively connected thereto, said
dial having a series of depressions adapted to
receive the ?nger of an operator, and a knob
rotatably mounted adjacent the dial so that
when the'operator’s ?nger is in a depression, it 20
can rest on the knob to assist in tuning, the knob
he can swiftly turn the dial down to the lower- - being operatively connected to the dial so that
most position with his index ?nger, and as he rotation of the knob rotates the dial.
4. In a radio receiving set, a tuning condenser,
does so, grasp the knob 24 with his thumb and
second ?nger and quickly tune the set sharply a tuning dial operatively connected thereto, said 25
dial having a series of depressions adapted to
for that station.
.
receive the ?nger of an operator, and a knob ro
In Fig. 5 is shown a modi?ed form of the de
tatably mounted adjacent the dial so that when
vice in which a tuning knob 24% is mounted on a
shaft 25% which is rotatable but which does not the operator’s ?nger is in a depression, it can rest
drive a dial [9a except through the agency of the on the knob to assist in tuning, the knob being 30
operator-‘s ?nger. Thus having brought the set movable so as to be operatively connected to
quickly to a roughly tuned position, .the operator the dial so that'rotation of the knob rotates the
by keeping his ?nger in the depression 21*’ as
shown in Fig. 5 can do the ?ne tuning while he
5. In a radio receiving set, a tuning condenser,
slowly rotates his hand about the shaft 25a. This a tuning dial operatively connected thereto, said
latter form of ?ne tuning can also be employed dial having a series of depressions adapted to
withthe set of Figs. 1 the if desired. In that receive the ?nger of an operator, and a knob
case the operator would not press the knob 24 in, rotatably mounted adjacent the dial so that when
as ‘shown in Fig. 3, but would merely rotate his
hand while the index ?nger is in the position the operator’s ?nger is in a depression, it can rest
on the knob to assist in tuning, the knob being
shown in the depression 2 Ia of Fig. 2.
movable
endwise'so as tov be'operatively con
Thus it will be seen that a very simple yet e?i
nected to the dial so that'rotation of the knob
cient form of telephone type tuning dial is pro
rotates the dial.
~
vided.
EDWIN G. BRADSHAW.
45
I claim:
of the casting 20, this tuning can be very deli
cately done. Thus with a little practice the
operator gets to know that for a given station
25
30
dial.
35
40
45
.
Y
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