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Патент USA US2112734

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March 29, 1938. v
Filed Sept. 27, 41937
2 Sheets-Sheet l
March 29, 1938.
Filed Sept. 27, 1937
2 Sheets-Sheet 2
Patented Mar. 29, 1938
* 2,112,734
2,112,734 '
Jesse H. Clark, Chicago, and John Kelly Johnson,
Evanston, Ill., assignors to Wells-Gardner &
Company, Chicago, 111., a corporation of Illi
Application September 27, 1937, Serial No. 165,866
5 Claims. (Cl. 116—124.4)
This invention is concerned with a tuning dial
of the screen type onto which may be projected
the image of a selected scale. Such a dial is
peculiarly suited for radio receiving sets. The
5 means for operating the present dial is intercon
trol shaft d having an operating knob D, the
position of the indicator being shifted with each
nected also withan associated tuning condenser
end is operable by a cord or ?exible Wire l3 from
a volume control shaft g having a‘ suitable op
erating knob G. Connected with this latter shaft
is the usual on-and-off switch (not shown).
Mounted with the aid of resilient cushions upon
the chassis base is a supporting frame H With
so as to assure coordinated action therebetween.
For its principal objects our invention is di
rected to certain features of improvement by
10 which a simple and inexpensive mechanism is
utilized for projecting images a relatively short
distance within a space which is shielded only
partially from external light, natural or other
wise; by which an optical system is mounted to
15 swing about an axis which is substantially co
incident with the focal point thereof so that the
light rays may pass through a selected scale or
special area of the slide; and by which a rugged
construction is produced capable of operating de
20 pendably with little or no attention over a long
period of time. A mechanism which embodies
such features of improvement is illustrated in the
accompanying drawings in the manner following:
Figure 1 is a plan View of a radio receiving
chassis on which is mounted a projection type of
tuning dial made according to this invention.
Fig. 2 is a vertical section through the chassis,
taken on line 2—-2 of Fig. 1, showing the projec
tion apparatus in side elevation;
Fig. 3 is a vertical section, taken on line 3-—3
of Fig. 1;
Fig. 4 is a detail in section, taken on line 4 of
Fig. 2; and
Fig. 5 is a fragmentary view in elevation of the
screen and its supporting plate.
The parts which are special to this invention
may be mounted upon a chassis base A. As
shown, they are assembled into a separate unit
capable of being installed or removed independ
40 ently of the remaining apparatus with which
it is used.
In this connection use is made of a
vertical plate B in which is ?xedly mounted a
screen 0 (desirably of ground glass) on which
is projected an image in the manner to be pres
45 ently described. The screen, as shown, is pro
vided with an opaque border 1 de?ning near each
end a translucent elongated window 8.
Slidably mounted upon the rear side of the
plate at each of its ends are elongated indicators
50 v9 each having a marked portion l0 which is visi
ble through the proximate screen window. A coil
spring ll connects the plate and indicator in a
manner to raise the latter to an upper position.
Connected with one indicator is a ?exible cord
55 or wire I2 extending downwardly to a tone con
actuation of the shaft to afford a visual engage
ment of the tone control adjustment at all times. i
The indicating mechanism at the opposite plate
oppositely extending feet IS. The forward feet
terminate in depending lugs l6 through which ex
tend suitable fastenings which connect the screen
plate immovably to the base’. Joined to the sup
porting frame and extending rearwardly there
from is a condenser frame I to the rear end of
which is af?xed a vertical post J with a bracket
ll connecting its lower end to the chassis base.
Supported upon the post is one end of a plat
form K which extends forwardly to be further
supported by the frame H, and thence to the
screen plate where it is formed with a depending
?ange I8 for convenient connection therewith as
with screws 19. The structure just described, viz.
the screen plate and frame elements rearwardly
thereof is a rigid unit which is ?xedly secured to
the chassis base.
Extending rearwardly from the post J at spaced
points near its top are two cars 20 and 2| form
ing bearings for a spindle 22 whereon is secured
a pulley 23 which is con?ned against axial move
‘ment between the ears. Extending upwardly
from the pulley on which it rests is a bushing 24
which is disposed axially Within a circular disk
25 forming the base of a cylindrical slide L. This
disk is provided with upstanding marginal walls
26 de?ning an annular seat wherein is ?tted the
lower edge of a ?lm 21 bent into circular form
with its ends united. If desired, the top ?lm 40
edge may be turned down upon itself as at 28 to
provide a reinforcement.
Rotary movements to the cylindrical slide are
imparted by an endless belt transmission 30 which
extends around the horizontal pulley 23 and 45
thence forwardly over vertical pulleys 3|, and
downwardly around one groove of a duplex pulley
32 which is mounted on the forward end of a con
denser shaft 33 which extends horizontally
through‘the frame J where it is journaled for ro 50
tation in upstanding plate bearings 34 and 35.
Carried in the frame J are condenser plates,
some ?xed and others movable into and out of
the spaces therebetween, the latter being mount
ed upon the shaft 33 so as to operate therewith. 55
As by a belt 36 which runs around the duplex
pulley 32 and the control shaft f which is equipped
with an operating knob F (see Fig. 1), adjusting
movements may be imparted to the movable con
denser plates concurrently with rotary movements
on the part of the cylindrical slide.
The platform which extends between the slide
and screen supports a pair of upstanding spaced
plates 40 and 4| between" which is pivotally
10 mounted a bracket M having forwardly and rear
wardly depending arms 42 and 43, respectively.
Between the supporting plates and the screen is
pivotal connection at 73 with a link 14 which joins
at 15 with a crank arm 16 carried fast by the con
trol shaft e having an operating knob E. As by
a tail piece 11 which carries a friction button 18
adapted to engage within a selected socket 19 in a
?xed plate 80, a detent is provided by which the
shaft e with connected linkage, including the
bracket M, is releasably secured in any of its ad
justed positions of which three are indicated in
the drawings.
By rotating the knob E a force is transmitted to
the bell crank mechanism whereby the bracket M
an open-ended light box N of ?ber or the like,
secured to the platform as by a screw 44. To
the bracket rear arm 43 is attached a vertically
is rocked about the vfocal point as a center of
movement, being either raised or lowered with a
adapted to support an illuminant 46 Which, as
shown, is an electric light bulb which depends
from an associated socket 41 whichis ?tted ad
scales may be marked upon the slide, each pref
erably extending circumferentially thereof so as
15. adjustable tube 45, open at top and bottom,
20 justably into the upper end of the tube.
illuminated ?lament of the light bulb lies oppo
site a horizontal tube 48 through which light rays
pass for projection through a condenser lens 49
which is ?tted into the rear end of the tube 48,
25 this lens forming part of a lens system which
comprises also a compound projector lens of
which one, the lens 50, is placed adjustably at the
forward end of this tube. Adjacent the exterior
of the cylindrical slide, and upstanding from the
platform to which it is secured, is an apertured
consequent change in the position of the entire 15
opticalv system relative to , the slide. Various
to present different object areas from any selected
one of which an image may be projected onto the 20
screen, each such image being'differently colored
by reason of the light rays being transmitted
~through a separate color panel of the screen.
We claim:
1. In a radio receiving set, a light projection 25
dial comprising, in combination, a ?xed image
screen, a slide movable through a. single path, a
plurality of lenses together with an illuminant
forming an optical system, and a mounting for
the optical system adapted for pivotal movement 30
plate 5| having a three-color screen 52 over its
about an axis which substantially intersects the
opening. The transparencies :r, y and 2 which
form this screen are disposed horizontally edge to
edge in such position that the light rays pro
jected from the illuminant will pass through but
one of them, depending upon the vertical adjust
'ment of the pivoted bracket M. A second lens
focal point of the light rays passing through the
optical system.’
2. In. a radio receiving set, a light projection
dial comprising, in combination, a ?xed image
screen, a slide movable through a single path, and
an optical system comprising a plurality of lenses
55 of the compound projector, arranged forwardly
and an illuminant, a common mounting for the
of the color screen is carried by a sleeve 56 ad
40 justably ?tted into a. tube'51 ‘which is formed in
connection with the forwardly depending arm 42
of the bracket. By the means described, an op
lens system shiftable from one position. to another,
and means guiding the mounting in its shifting 40
movements in a manner whereby the focal point
lenses, through the slide, color screen, and light
of the optical system will remain in a substantially
?xed position with respect to the screen.’
3. In a radio receiving set, a light projection
dial comprising, in combination, a ?xed image
box, and onto the screen where is projected an
image that'is readily visible from the opposite or
exterior side thereof.
prising lenses and an illuminant, anda pivotal
mounting for the optical system located at a
The'pivoted mounting of the bracket M will
now be explained. It is important that the light
the optical system through a swinging movement 50
rays shall remain focused upon the screen in each
having a center substantially coincident with the
tical system is provided for transmitting light
rays from the illuminant through the several
of the adjusted positions of the bracket, conse
quently the center of pivotal movement should be
approximately at the screen itself. In order to
overcome certain mechanical di?iculties of such
an arrangement, we provide in the bracket sup
porting plates 40 and 4| upper and lower opposed
slots 60 and 6|, respectively, all of arcuate form
with a common center which is coincident with a
horizontal line extending through the focal point
at the screen. Slidingly ?tted within each pair
of slots is a pin 62 carried in a bearing 63 which
extends transversely of the bracket. Adjusting
movements of the bracket about the focal point as
65 a center are effected with the aid of a bell-crank
mechanism (see Fig. 4) comprising a weight arm
65 underlying a rib 66 on the depending bracket
arm 42 with a spring connection 6‘! to maintain
the former in. engagement with the latter, the
70 weight arm being extended from an offset bar 68
having at opposite ends ears 69 formed to receive
a common pin ll] whichv is supported between lugs
‘H which upstand from the platform K, a, power
arm 12 being depended from the forward ear for
screen, a movable-slide, an optical system com
point remote from the screen adapted to guide
4. In a radio receiving set, a light projection
dial comprising, inv combination, a ?xed image
screen, an optical system comprising spaced lenses 55
and an illuminant, a light box positioned inter
mediately of the screen and optical system, and a
pivotal mounting for the optical system located
adjacent the light box end which is remote from
the screen adapted to con?ne movements of the 60
optical system through a path whose center is
substantially coincident with the screen.
' 5. In a radio receiving set, a light projection
dial comprising, in combination, a ?xed image
screen, an optical system comprising spaced lenses 65
and an illuminant, a circular rotatable slide en
closing the illuminant and one lens, and a pivotal
mounting for the optical system permitting swing
ing movements thereof in a plane which is sub
stantially coincident withthe slide axis about an 70
axis which is substantially coincident with the 4
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