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Патент USA US2105639

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Jan. 18, 1938.
2,105,639
L. H. DAVIS
INDICATOR
Filed NOV. 30, 1936
2 Sheets-Sheet l
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Jan. 18, 1938.
L_ H_ DAV|$
2,105,639
INDICATOR
Filed Nov. 30, 1936
2 Sheets-Sheet 2
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2,105,639
tively-produced pencils of light will provide an
accurate indication of the frequency to which
the set is tuned.
'
and means for moving said pencil of light about
'
Shaft'äß (Fig. 2) extends to a suitable range
change mechanism, indicated generally at 52,
and carries a switch arm 54 (Fig. 6) for control
ling lamps 26, 28, and 40, 42, which are con
nected to switch contacts 55 and 56, by leads 58
and Bü, respectively. Current for these lamps
10
frequency-indicating pencil of light of distinc
tive color upon said selected one of said scales,
the said selected’scale.
.
3. In multi-range radio apparatus having
means for changing the frequency range of said
apparatus, an opaque surface having a plurality
ofk discrete, distinctively colored, translucent
scales thereon, each of said scales representing
may be supplied through a suitable transformer-
one frequency range of ’said apparatus, means 10
62 to one terminal of which the common return
wire 58 for all of the lamps is connected.Y The
other terminal 60 of the secondary winding of
transformer 62 is connected to the switch arm
5S, so that when shaft 50 is moved to change the
responsive to the» operation of said range Vchange
frequency range orvband of the receiver, arm 54
will complete the circuit to one or the other of
these pairs of lamps, as determined'by the par
moving said colored Vpencil of light about theV said
ticular frequency range selected.
.
The mechanism for rotating the' tuning shaft
IEI (and hence the frequency indicating pencil of
light formed by lamp 40 and slit 34a or lamp 42
means for illuminating a selected one of said
scales and Yfor producinga correspondingly
colored frequency-indicating'pencil of light upon
said selected one of said scales and means for 15
selected
scale.
.
'
-
4. In multi-range radiol apparatus having
means for changing the frequency range of said
apparatus, a continuous surface constituted by a 20
plurality of scale-bearing members joined Vin
cdge-to-edge relation with anrinterposed layer
and slit 34e) may be of any suitable or conven
of opaque material therebetween, the number of
ienttype. Thus,asshown in Fig. 2, a tuning con-V rsaid discrete scale-bearing members correspond-`
25 trol shaft lil, which will be understood to extend ing to the number of separate bands to which 2.5;
through the front panel of the set, and which is said apparatus may be tuned,Y means disposed
supported as by a bracket 12 affixed to chassis l2, adjacent'an ledge offsaid surface forV illuminating
carries a bi-part spool 14 which grips the periph
a selected one of saidV scale-bearing members,
ery of the disc 34 upon which lamps 40 and 42 means for producing a frequency yindicating
30 are carried. Torque applied to control shaft 10
pointer of , light upon said selected one of said 3.0
will be transferred through spool 14 and disc 34 scale-bearing members,` said. edge-illuminating
to the main tuning shaft I0 which, in rotating, Y means and said’ frequency-indicating pointer be
varies the frequency of the tuning element C in ing responsive to the operation 'of said range
a known manner.
change means, and means for moving said point
The visual indication provided by the pencil er of light about said selected oneA of said scales. 35.'
-35
of light Vupon the substantially rectangular scales
5. In` multi-range ¿radio apparatus `having
of the drawings is quite different from that pro
duced by a pointer traveling about va circular
means for changing the frequency range of said
apparatus, an opaque surface having a plurality
scale. This difference may be attributed invpart
to the fact that the axisof rotation of the point
of said scale areas representing one- frequency
er inVV the instant case is hidden from the ob
server so that the pencil of light in its travel ap
pears to “ñoat” up and across Vand down the
range of said radio apparatus, aV mask in the
form of adisc mounted for movement about a
central axis in the rear of said opaque'surface,
scale and tokchangeits length (fo-r instance, at
said masks being provided with a plurality of
elongated slits individual to'saidY Ascale areas,
lamps individual to Vsaid slits mounted behind
the corners of the rectangle) Wherever this, is
necessary to completely span the surface of the
scale.A
`
'
said mask, means
,
kWhile theV invention has been described as em
` bodied in a radio receiver having but two»Y fre#
quency ranges, it is to be understood that the
invention is not limited to such application, asY
the disclosure in this respect is merely illustra
tive for the purpose of explaining the inventive
concept.
.
f
Y
y
What is‘claimed is:
l. In l multi-range
radio
apparatus
having
means for changing the frequency range of said
apparatus, a surface having a plurality of dis
Í crete scales thereon, each'of said scales repre
60
of discrete translucent scale areas thereon, each
senting one frequency range of'said apparatus,
means responsive Yto lthe operation of said range
change means for illuminating a selected one of
said scales andfor producing a frequency-indi
cating pencil of light upon said selected one of
`Vsaid scales, andmeans formoving said pencil ofV
light about the said selected scale.
ï 2. In multi-range radio apparatus having
means for changing'the frequency range of said
apparatus, an opaquesurface having a plurality
of discrete ytranslucent scales thereon', each of
f1.0
4,5
connected to said `range
change means for selectively illuminating said
lamps whereby to project a frequency-indicat
ing pencil of light upon a selected one of said 50
scale areas and means for moving said mask and
hence said pencil of, light about the selected `
scale area.
v
6. In Ymulti-range 4radio vapparatus having
means for changing the frequency range of saidV
apparatus, an opaque surface having a plurality
of discrete translucent scale areas thereon, each
of said scale areasV representing one~frequency
range of said radio apparatus, a mask in the
form of a disc mounted for movement about a
central axis in the rear of Ysaid opaque surface,
said mask being provided with aV plurality Vof
elongated yslits 'individual to said scale areas, a
second mask'mounted behind «said first-men
tioned mask and for movement therewith, a plu
rality of lamps mounted on said` second mask in
line with said respective slits, means connected
to said range change means for selectively illu
minating said lamps whereby tor project a fre
quency-indicating pencil of lightupon a selected
said scales representing one frequency range of ` one of saidtranslucent scale areas, and means
said apparatus, meansresponsive to the opera
for moving said Ymasks and hence said pencil of
tion of said range change means for illuminating Y light about the selected scale area.
a selected one of said scales and for producing a
LEWIS H. Davis.` i
5.5
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