US2261386A - Tuning indicator system - Google Patents

Description

Nov. 4, 1941- R. Kl-:BLusEK ET Ax.'l

TUNING INDICATOR SYSTEM Filed Aug. 5, 1939 ao H n 2 o0 S W LV.. R7. Y oK E THB N R L E H o nllqhwlnlllllnuul m0 .T FmHI. We T wl|||J IKA A r0` DN l/ I 1 1 R A :a: HA Q ml. p S C Il I m U H 3: 1 \I L: i Y: Y 1 5 B 2 9 L o 4 f 2 H 5; x n T llllll 59 w f Patented Nov. 4, 1941 UNITED STATI-:s PATENT OFFICE 2,261,386 TUNING INDICATOR SYSTEM Application August s, 1939, sensi No. 283,532 En the Netherlands September 3, 1938 6 Claims.

This invention relates to a wireless receiving set comprising a tuning device having a plurality of main dials for the various wave length ranges.

This set is characterised in that it comprises for one or more bands from one or more wave length ranges particular auxiliary dials which areassociated with one or more auxiliary pointers and which are substantially longer than the corresponding bands on the main dials and through the cooperation of a screen moving relatively in relation to the tuning device the auxiliary pointer or pointers is or are only visible when the main pointer or pointers cooperates or cooperate with a dial containing the bands under consideration.

A tuning device of this kind may be used with advantage in wireless receiving sets comprising means for the obtainment of the so-called band spreading.y Such sets comprise means for enlarging, so to speak, a given wave-band. If a mainpointer of the set on one of the main dials indicates a. given band, an auxiliary pointer in the set in cooperation with one of the auxiliary dials permits of effecting this tuning accurately. As a rule, the band-spreading means will alone be used in the ultra-short wave region. 'When 25 in this latter case tuning is eiiected in the medium wave or long wave range, the auxiliary dials y vided in the set. It is, of course, possible to cause the screen device to move relatively to the stationary tuning device but preference will generally be given to movable arrangement of the tuning device and to arranging for the nontransparent parts of the set which surround a window in the set to serve as a screening device.

In a favorable embodiment of the set according to the invention the main and auxiliary dials are rectilinear and arranged parallel to each other. It is, of course, also possible to form them into a curved shape. In order to eiiect tuning as accurately as possible it is preferable, according to the invention, that the auxiliary dialsl should extend throughout the length of the main dials. K

From a constructional point of view it is simple to mount the main and auxiliary dials all on a movable device used in common suchas a slide, a drum, a iilm or the like which is partly visible through a window in the set, the device or. devices carrying the main and auxiliary pointer lor pointers. being so coupled to the device carrymg (Cl. 11G-124.1)

is or are only visible if the main dials `iointly with the associated auxiliary dials appear in front of the window. n l

VIn a further favorable form of construction of the wireless receiving set according to the invention the movement of the wave length switch has the eii'ect of moving the device carrying the dials and the frame of the pointers to the desired position.

In order that the invention may be clearly unexhibits the dial, Fig. 1 being a sectional view taken on the line I-I of Fig. 2, Fig. 2 being a front elevation, and Fig. 3 being an enlarged pargg tial view of Fig. 2 showing only the scales and pointers which are viewable through the panel window when the receiver is operated in the short-waver range.

The Wall I of the cabinet has formed in it a window 2. At the back of the wall I there are two vertical guides 3 on which a frame comprising bars4 'and 5 is adapted to slide by means of sleeves 6, "I, 8, and 9, said frame carrying a plate Ill which has the various main and auxiliary 30 dials mounted on it. This frame carries in addition a guide II for the auxiliary pointer I2. The frame provided with the plate I0 and the auxiliary pointer I2 can be raised and lowered by '35 a slot 24 of the cabinet.

The guides 3 have in addition mounted on them a further frame'which comprises barsA I3 and I4 and is adapted to slide on the guides 3 b .v means of sleeves I5 and I6. The bar I3 serves as a '40 guide. for the main pointer 29. 'I'he sleeves I5 and .IS are provided `with an extension 25 and 2l engaging blocks 26 and 28 arranged to be stationary in the cabinet. The cooperation of the extensions 25 and 21 with the blocks 26 and 28 45. has the effect of determining the lowest position Y of the frame of the main pointer 29.

The plate' I0 has dials I'I, I8, I9, 20, 2l and 22 mounted on it. The dials I1, I8 and'l9 serve for the long-wave, medium-wave and ultra-short- 50 wave regions. There is a difliculty in tuning stations in the ultra-short-wave range since a comparatively great number of stations are included in a. small number of narrow-bands. These bands are indicated in Figs. 2 and 3 by small black `blocks on the dial I9. The fact that the set comprises band-spreading means permits of one or more of these bands being extended over a much larger region. For this reason the device according to the invention comprises the auxiliary the dials that the auxiliary pointer or pointers 00 dials 20, 2| and 22 for the bands 30, 3| and Ma.

and the auxiliary dials 20, 2l and 22 becomel visible. Simultaneously, the sleeves 6.` and I of the frame of the plate l have raised the sleeves l and I6 of the frame of the main pointer 2O to such extent that this main pointer cooperates with the ultra-short-wave dial Il. Due to the displacement of the plate l0 the auxiliary pointer I2 has been raised simultaneously and. as shown in Fig. 3, it extends in front of the auxiliary dials 20, 2| and 22. ,Near the wave band to which the pointer 29 points is shown a given range which corresponds with the auxiliary dial 20. Obviously, this arrangement leads to the advantage that the auxiliary dials and auxiliary pointer are only visible when tuning is efi'ected in the ultra-short-wave region.

What we claim is:

1. A tuning indicator for a radio receiver of the type capable of being tuned to a plurality o! wave-length ranges including a short-wave range, comprising a member having formed thereon a plurality of main scales each corresponding to one of said ranges and a plurality of 'auxiliary scales each corresponding to only a portion oi.' the scale of the short-wave range, a main pointer adapted to selectively cooperate with all of the rst mentioned plurality of main scales or with said scales except that of the shortwave range, and an auxiliary pointer adapted to cooperate with said auxiliary scales.

2. A tuning indicator for -a radio receiver of the type capable of being tuned to a plurality ot wave-length ranges including a short-wave range, comprising a slidable member carrying a plurality of main scales each corresponding to one except that for the short-wave range, an auxiliary pointer adapted to cooperate with said additional scales, a panel of the receiver provided with an aperture and means so constructed and arranged for adjusting the scale carrying member and the pointers relatively to the panel aperture that when the receiver is adjusted to receive wave-lengths other than short-waves only the scales corresponding to said wave-lengths and the mainpointer are viewable through the panel aperture, whereas when the receiver is adjusted to receive short-waves, the short-wave range scale. the additional scales and the main and auxiliary pointers are viewable through the panel aperture.

-5. A tuning indicator system for a radio receiver of the type capable of being' tuned to a plurality of wave-length ranges including a short-wave range and provided with band-spread mechanism when operated in the last mentioned range, comprising a member carrying a plurality of scales each corresponding to one of said ranges and a plurality of additional scales each corresponding t0 a predetermined and different portion of the short-wave range scale. a main pointer adapted under certain conditions of operation of the receiver to cooperate with the ilrst mentioned plurality of scales and under other conditions to cooperate with said scales except that for the short-wave range, an auxiliary pointer operativelyvassociated with the bandspread mechanism and adapted to cooperate with said additional scales,va panel of the receiver provided with an aperture and means so constructed and arranged for adjusting the scale carrying member and the pointers relatively to the panel aperture that when the receiver is adjusted to receive wave-lengths other than short-waves only the scales corresponding to said wavelengths;`and the main pointer are viewable through the -panel aperture,V whereas when the of said ranges, a plurality of auxiliary scales also carried by said slidable member and each corresponding to only a portion of the scale of the short-wave range, a main pointer in one position of the slidable member adapted to cooperate with all of the ilrst mentioned plurality of main scales and in a second position ot said member adapted to cooperate with-said scales except that of the short-wave range, and an auxiliary pointer adapted to cooperate with said auxiliary scales.

3. A tuning indicator as defined in claim 2 wherein the receiver is provided with a panel having a viewing window, the slidable member being positionedbehind said window and adjustable to selectively expose the short-wave scale and the auxiliary scales or the main scales exclusive of the short-wave scale.

4. A tuning indicator system for a radio receiver of the type capable of being tuned to a plurality of wave-length ranges including a shortwave range, comprising a member c a plurality of scales each corresponding to one of said ranges and a plurality of additional scales each corresponding to a predetermined and different portion of the short-wave range scale.,a main pointer adapted under certain conditions of operation of the receiver to cooperate with the first` mentionedplurality of scales and under other conditions to cooperate with said scales receiver is adjusted to receive short-waves, the short-wave range scale, the additional scales and the main and auxiliary pointers are viewable through the panel aperture.

6. A tuning indicator system for a radio receiver of the' type capable of being tuned .to at least a long-wave range and a short-wave range, comprising a member carrying a plurality of par allelly-arranged scales each corresponding to one of said ranges and a plurality of auxiliary scales each corresponding to a predetermined and.` diiferent portion of the short-wave range scale, a main pointer adapted under certain conditions of operation of the receiver to cooperate with the long-wave and the short-wave scales and under other conditions to cooperate with only said longwave scale, an auxiliary pointer adapted to cooperate with said auxiliary scales. a panel of the receiver provided with an aperture and. means so constructed and arranged for adjusting the scale'carrying member and the pointers relatively to the panel aperture that when the receiver is adjusted to receive long wave-lengths only the scale corresponding to said wave-lengthsand the main .pointer Iare viewable through the panel aperture, whereas when the receiver is adjusted'

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