US1856781A

US1856781A - Remote control for radio tuning devices

Info

Publication number: US1856781A
Application number: US407381A
Authority: US
Inventors: Louis H Morin
Original assignee: DOEHLER DIE CASTING CO
Current assignee: DOEHLER DIE CASTING CO; DOEHLER DIE-CASTING Co
Priority date: 1929-11-15
Filing date: 1929-11-15
Publication date: 1932-05-03
Anticipated expiration: 1949-05-03

Description

y 1932- L. H. MORlN 1,856,781

REMOTE CONTROL FOR RADIO TUNING DEVICES Filed Nov. 15, 1929 6 sheets-sheep 1 INVENTOR 4w;- -44 ML,

ATTORNEY May 3, 1932. L." H. MORIN REMOTE CONTROL FOR RADIO TUNING DEVICES Filed Nov. 15, 1929 6 Sheets-Sheet 2 INVENTOR Mam. BY

ATTORNEY May 3, 1932. H. MORIN REMOTE CONTROL FOR RADIO TUNING DEVICES 6 Sheets-Sheet 4 Filed Nov. 15, 1929 flldIilflllllallla INVENTOR ATTORNEY May 3, 1932. L. H. MORIN REMOTE CONTROL FOR RADiO TUNING DEVICES Filed Nov. 15, 1929 6 Sheets$heet 5 INVENTOR o lmqw. MA, BY

ATTORNEY May 3, 1932.

L. H; MORIN REMOTE CONTROL FOR RADIO TUNING DEViCES e Sheets-Sheet 6 Filed Nov. 15, 1929 OOOQOOOOO INVENTOR awn w. m;

ATTORN EY Patented May 3, 1932 UNITED STATES P AT LOUIS H. MORIN, 'OF NEW YORK, N. Y., ASSTGNOR T DOEHLER DIE-CASTING (30., A

CORPORATION OF NEW YORK 1 REMOTE CONTROL FOR RADIO TUNING DEVICES Application filed November 15, 1929. Serial No. 407,381.

This invention comprehends means to tune a radio receiving set at a point remote from the set. It has especial application to sets which are equipped with automatic tuning devices and in some respects constitutes an improvement in the device shown in my copending application Serial No. 384,831, filed August 10, 1929. In its broad aspect, the invention is independent of any particular form of automatic tuner device, although specifically the embodiment which I have selected for illustration is particularly designed to function with the form of automatic tuner which constitutes the subject matter of my copending application Serial No. 355,190, filed 'April 15, 1929.

Automatic tuners avoid the necessity of a delicate or very particular adjustment of the dials in order to tune a radio receiving set into resonance with any selected wave, and enable one to effect a selective tuning by the performance of a simple mechanical operation that requires no delicacy of control. For this purpose they have a plurality of manually controlled actuating members which are operatively related to the movable part of the tuning element of the set and which are independently adjustablewith respect to such relationship. Each actuating member is thus so set that when'manually operated it will bring the tuning element into resonance with a particular wave length.

In the form of automatic tuner illustrated in my said copending application Serial No. 355,190, the actuating members which are adjustable with respect to the movable member consist of single toothed pinions frictionally mounted upon an operating shaft and adjustable angularly thereon. The operating mechanism consists of apair. of ring gears disposed side by side. and fitting over the pinions, and slidable longitudinally of the shaft selectively into register with the pinions. The ring gears have external gear teeth and each has a single internal tooth,

and suitable means, such as a rack, is employed to operate the gears in opposite directions. The internal gear teeth will be stopped in their rotation when they are both in engagement withthe pinion tooth but on opposite sides thereof.v In order to tune the set to any station corresponding to one of the single toothed pinions, the rack with its ring gears is moved laterallyinto register with thatpinionand the rack is then moved longitudinally so as to rotate-the two ring gears until their internal teeth engage on opposite sides of the single tooth of the pinion.

This lateral shifting and longitudinal actuation of the rack is effected manually. In the form of remote control shown in my copending application Serial No. 384,831, a motor is connected to effect the same movements of the rack and ring gears when a manual switch is operated at the remote point. The transmission between these elements and the motor for the effecting of the lateral shifting includes a shifting device which is rotatable upon a shaft parallel to that upon which the pinions are mounted and is also slidable longitudinally thereon, and this shifting deviceis operatively connected through a pivoted lever to thehousing for the ring gears, whereby a lateral movement of the shifting device is transmitted to the ring gears and rack. This shifting device has an oblique cam'face on its peripheral surface and the rotary movement which is im .parted to the shifting device-by the motor is translated into a lateral or axial movement by a plurality of abutment pins which are selectively insertable intodthe path of the cam face. The extentof the axial shifting of the device depends upon. which pin isinsorted and this in turn is controlled by the manual switch device at the remote control point.

F or longitudinal actuation of the rack by the motor a pivoted lever is connectedfor reciprocation by the motor and is of sufiicient width to engage anabutment upon the rack in any position of lateral adjustment of the mission through an automatic clutch under the control of the motor.

The improved transmission for the effecting of the lateral shifting and subsequent operation of the operating means includes a screw shaft which is rotatable in bearings provided therefor. A nut having internal projections corresponding to the thread of the screw shaft is fitted thereover, so that rotational movement of the shaft advances the nut longitudinally of the shaft. The nut 1s secured to the housing for thering gears, whereby lateral movement of the nut is transmitted to the ring gearsand the rack. This shifting of the ring gears and rack is governed by a plurality of abutment pins which are selectively insertableinto the path of the housing for the ring gears. The extent of the lateral shifting ofv the housing depends upon which pin is: inserted, and this in turn is controlledby the manual switch device at the remote control point.

The actuation of the ring gears is effected by agear secured to the nut on the screw shaft to rot-ate therewith,and the nut rotates with the screw shaft when its further lateral movement is restrained by an abutment pin. Specifically, the nut is journaledin the housing for the ring gears. As the screw shaft is rotated the nutadvances along the'shaft anc abuts against the side of "the gear housing, thereby moving the housing laterally. lVhen the housing strikes the abutment pin inserted in the path thereof, further lateral movement is restrained and the internal projections on the nut wedge in the-threads of the screw shaft to rotate the nut therewith. Rotation of the nut rotates its gear with it, and this gear not only rotates oneof the ring gears but also rotates a pinion which meshes with it and which also meshes with the rack, thereby effecting a longitudinal movement of the rack.

WVhen the tuning of the set is completed and the screw shaft is released by action of the automatic clutch, the gear housing is returned to its original position by "means of a spring.

Various other particulars ofthe invention will appear from the following description of the illustratedembodiment.

Fig. 1 is a side elevation partly in section of an embodiment of the invention installed in a cabinet, the front panel of which is shown in section;

Fig. 2 is a plan partly in section of the apparatus;

Fig.- 3 is avertical section through the automatic tuning portion of the mechanism taken on the irregular line 33 of Figure 1;

Fig. 4 is a sectional elevation through the mechanism controlling the automatic clutch;

Fig. 5 .is a section similar to. Figure .4 of .a modified form of reduction gearing;

Fig. 6 is a vertical sectional detail through the main or operating shaft of theautomatic tuner and the parts carried thereby;

cuits of the system.

The movable member of the automatic tuner, which-is the part that carries the manually actuable devices that are adjustably related thereto, is 'operatively connected in any suitable way with the tuning elements or resonance-varying devices of the receiving set.

In the illustrated construction this movable member is a shaft 1 and the tuning element is a variable condenser 2, only a portion of which is shown and which is supported in the cabinet by a "bracket above the tuning mechanism. The operatiw connection consists of the'two pulleys 3 and a'on'one end' of the shaft 1 and a pulley 5 onthe condenser shaft which are connected 'by a cord belt 6, the" ends of which are connected to the peripheries of the pulleys 3 and 4.- and which run over the idlers 7 and 8 intermediate of the pulleys, these idlers beingsecured in brackets on the base plate'9. The rotation-of the shaft 1 is thus transmitted 'to'the-condenser The shaft 1 is journaled in side frame members 10 and 11 and is provided with four keyways along an enlarged intermediate portion, as show-n'clear ly in Fig. 1. Mount ed upon this enlarged portion of the shaft are a plurality, shown as ten, of pinions which are numbered from 120 to 127', inclusive. These pinions are each provided with a single tooth 13 and are loosely mounted upon the shaft. Between the pinions are friction discs 14, and a friction disc is also provided at each end of the pack, the disc 14a being at the left end and the disc 1-115 beingat the right end. discs and pinions are beveled, the pinions having a widened periphery and the discs having a narrowed periphery. In this way, the tooth 13 is made wider than the hub of the pinion so as to provide a fairly broad engaging face for the teeth on the actuating gears.

A' clamp nut 15 screws on the right end of the shaft 1, which is threaded for this purpose, and this nut is providedat its outer end with anintegral spur gear 16 with which shaft 18 within the housing 19 meshes with,

evel gear 22 on a stem 23 which bears in the The engaging faces of the front wall of the housing 19 and projects through the front plate 20. A knob 24 on this stem 23 afiords means for manipulation of the gear train just described, the knob being in this manner brought to the central vertical line of the panel.

Through this connection the turning of the knob 24 serves to back off and screw up the clamping nut 15 and thereby release and unclamp the pinions. Three coil springs 25, one of which is shown in Fig. 6, are seated in recesses in the inner face of the clamping nut 15 and these springs at all times bear against the outer face of a washer 26 on the shaft 1 immediately adjacent the friction disc 14b and thereby serve to exert a light frictional pressure upon the pack even when the nut 15 is backed away. This pressure is to hold the pinions sufhciently in frictional engagement with the shaft to prevent their displacement accidentally during the setting of any one p1n1on.

Back of the clamping nut 15, the shaft 1 has an abutment 27, which is shown as a collar fixed upon the shaft. This abutment permits of just enough travel of the nut to clamp and release the pinions. The engagement of the nut against the abutment 27 serves to lock the nut to the shaft against relative rotation. In this way, the nut 15 is connected to rotate the shaft 11 and hence the movable part of the tuning element 2 when the pinions are unclamped and free to be turned upon the shaft '1. It will also be observed that when the nut is in its clamp ing position, it is frictionally locked to the shaft through the friction discs and pinions and that, therefore the knob 24 may be employed to adjust the tuning element in'both positions of the clamping nut.

The outer fri tion disc 14a has a lateral stop projection 140, which cooperates with a web 10a on the inner face of the side plate 10 to limit the rotation of the shaft 1. When it is desired to back off the nut 15, the knob 24 is turned in a proper direction until the stop members 1064 and 140 engage, whereupon further rotation of th shaft 1 is prevented and the continued turn ing of the knob serves to feed the nut in a backward direction until it engages the abutment 27. When the knob is thereafter turned in the opposite direction, the shaft 1 will-turn with it due to the frictional engagement between the nut and the abutment 27 until the sh aft reaches its opposite limit of movement. Thereafter further turning of the knob will. serve to feed the nut forward and'clamp the pinions and friction discs together.

Thernanual operating elements are shiftable into engagement selectively with any one of the pinions. They are carried by a support which consists of a two-part cast 28. This casting has a hub portion 29 its front end which slides upon a transverse guide rod 30, and is also provided with aws 31 which slide upon a rear transverse rod 32,

the upper jaw carrying a roller 33 which bears upon the rod 32. This casting has a downward annular. projection 34 which axially surrounds the shaft 1 and the parts mounted thereon. The inner faces of the two halves of the annular portion of the casting are recessed and within this recess with their axes in line with the annular part 34 of the casting are two annular gears 35 and 36, each gear having on its outer lateral face a flange 3'?, which fits within the inner periphand each gear has on its inner periphery a" single tooth 38. The inner diameter of the gears is such that the teeth 38 will strike the tooth 13 of any pinion as they are rotated about that pinion.

On the upper part of the casting 28 at the top of the recess between the two inner faces of the halves is slidably disposed a rack 39 which runs from front to rear of the casting and has its front end protruding out through a horizontal slot in the front panel of the cabinet. On this front panel is secured a knob 40, back of which is an index pointer 41, the rear part of which extends through the slot back of the knob and is secured to the front face of the casting. The rack 39 has operative connection with both gears 35 and 36, the width of the rack equaling the combined width ofthe two gears. This connection is such that the movement of the rack rotates the two gears in opposite directions. For this purpose the rack is shown as geared to the gear 35 through a.

single pinion 42, and as geared to the gear 36 through the two pinions 43 and 44.

A convolute spring 45 servesto retract the rack 39 after it is withdrawn by hand to effee a tuning operation. This sprin is attached at oneend to the rear end of t 'e rack 39 and is bent around an idler pulley 46 on the rear of the casting and is connected at its other end to a pin on the casting below the aws 31. A. decorative escutcheon plate 47 is disoosed on the front panel about the slot in the panel through which the rack extends and slides, and in this escutcheon plate im.- mediately above the slot there is secured it These two gears have their strip 48 on which are marked the initials of the several stations to which the set may be automatically tun-ed. Back of this strip is a transparent opening at the rear of which is a light 49 for interior illumination of the strip. The top of'the guide shaft 30 is-provided with a series of notches 50, which notches register with the initials of the several stationson the strip 48, and these notches are in direct alignbrought to bear upon them.

mentwiththe several pinions 12. A bifurcated bell crank lever 51 is pivoted to the hub 29 of the casting28 directly above the rack 39.: Journaled between one pair of arms of the lever 51 there is a cam roller 52 which is held in contact with the top of the rack 39 by a convolute spring 53. To the other pair of arms of the bell crank lever there is secured a lateral extension 54 which is adapted to register with the appropriate notches 50 in the top of the guide shaft 30 when the rack is pulled out. A strip 390. on the top of the rack 39 is of a height to raise the cam roller 52 sufiici-ently to depress the extension 54 into the notches in the top of shaft 30 when the rack'is pulled out, and the strip is of such a length that it terminates just back of the cam roller 52 when the rack is retracted. On the rear end'of the rack a conducting strip 39?) is secured to the rack and insulated therefrom and is so located that when the rack is pulled out it contacts with the cam roller 52 to complete an electrical circuit as will hereinafter appear.

Each pinion is set in proper position to bring the tuning mechanism and the receiving circuit into resonance with the particular station which the pinion represents, in the following manner: The knob 24 is turned so as to back off the nut 15 and release the compression upon the elements on the shaft 1 The springs 25 continue to exert a pressure upon the elements so as to hold the pinions against turning until positive force is If it be desired, for example, to set the pinion 1245 so that its actuation will tune the set to WAAM, the knob'etO with the rack and other parts carried by the casting 28 are moved over to register with the slot 50 registering with the station VAAll I, which is the position of the parts shown in Figs. 3 and 6. The rack 39 is then withdrawn. This movement rotates the gears 35 and 36 in opposite directions and the teeth 38 cooperate to move the tooth 13 on the pinion 12a to the'pos ition where the teeth 38 meet. The pinion is thus locked in this position. Due to the releasing of the clamping pressure of the nut 15, the shaft 1 may now be turned within the pinion 12a and the pinion 12a will be restrained from rotation by engagement of the teeth 38 with the tooth The other pinions will, however, turn with the shaft without altering their angular relation thereto dueto the pressure of the springs-25 In order to turn the shaft 1 within the pinion 13a and thereby tune the set to TVAAM, the operator has only to turn. the knob 24, for the nut 15 is now locked to he shaft 1, as above explained, by reason of the engagement of the nut 15 and the abutment 27. When the set is tuned to station WAAM, the operator will release the rack and further turning of the shaft 1 by the 3' knob Qiwill thereafter carry the pinion 12a with the shaft without changing its-angular relation thereto. The operator will, therefore, turn the knob until the shaft 1 reaches the limit of its movement, after which further turning of the knob will screw up the nut 15 and positively clamp the pinion 12a to the shaft. The nut is thereby also locked to the shaft by reason of its frictional engagement with'the washer 26, and the operator may use the knob 24 for tuning the set and at the same time the rack-operated parts may be used for automatically tuning the set to any one of the ten stations represented by the ten pinions.

It will be understood that the steps above described for setting the pinion 12a will be repeated with all of the other pinions, the set being tuned to the respective stations which the several pinions represent. WVhenever the gears 35 and 36 are moved into register with any pinion and the rack is withdrawn, that pinion will always be moved to the position which it occupied when it was set with respect to the shaft 1 and it will, therefore, always move the tuning element to the proper position to tune the set to the station which it represents.

The mechanism so far described is the automatic tuning mechanism of my said copending application Serial No. 355,190 with certain improvements which constitute the sub]ect matter of my copending application Serial No. 377,709. I shall now describe the remote control part of the mechanism. This in the main comprises means acting upon the automatic tuner to cause it to do automatically what the operator does manually by manipulating the knob 40. In other words, the illustrated embodiment of my invention causes the rack 39 to travel laterally to bring the gears 35 and 36 into register with the pinion representing the selected station and then to move longitudinally in an outward direction and actuate the pinion 12 to bring the set into resonance with the selected station.

Power is delivered to the mechanism for the automatic operation by an electric motor which is attached by screws to bosses on the under side of the base plate 9, rubber washers being interposed to deaden the sound and cushion the vibration. This-motor is connected through a train presently to be described to a transverse screw shaft 56 bearing in the side frame member 10 and a thrust bearing 57 secured to the side frame member 11. The shaft 56 extends through a hub portion of the pinion H which is journaled in the casting 28 and constitutes the aforementioned nut. This pinion bears against the side of the casting through a thrust bearing 58. Internal projections 59 are formed on the nut portion of the pinion 424 and lit in the threads of the screw shaft 56. Clockwise rotation of the shaft 56, as viewed in Figure 1, will advance the pinion along the shaft, and the pinion bearing against the side of the two-part casting will move the casting laterally, rotation of the pinion being restrained by the friction of the train, presently to be described, connecting it to the rack 39.

The normal position of the rack is at the left, as shown in Figure 3, or at the right as viewed from the front of the cabinet, to which position it is resiliently urged by a convolute spring 60. The spring is secured at one end tothe hub 29 of the casting 28 surrounding the rod 30 and is bent around an idler pulley 61 on the side frame member 11 and connected at the other end to the side frame member 11 near the base thereof. The distance the rack will be moved laterally from the normal position by rotation of the shaft 56 is determined by the abutment levers 62 which are insertable into the path of the casting 28. There are in all nine abutment levers, one for each of the pinions 12a to 122', the abutment for the pinion 122' being.

a stop shoulder 63 on. a slotted abutment guide member 64 in the slots of which the ends of the levers 62 are received. ,Each lever is controlled by a solenoid 65. The levers are pivotally supported'by uprights 66 which with the solenoids are supported on base plates 67 and 68 on opposite sides of the guide member 64, the solenoids being disposed five on one side and four on the other side of the member 64 in two staggered rows of three and two on one side and two and two on the other. The supporting uprights 66, are disposed between the solenoids and the member 64. The normal position of the levers 62 to which they are 46' levers are so disposed that the casting 28 will abut against them at a point where the gears 35 and 36 register with the appropriate pinion 12. The insertion of a lever into the path of the casting is controlled manually at a remote point by means of a controller which will hereinafter be described.

When the casting 28 reaches the abutment lever inserted in the path thereof or the shoulder 63, further movement of the pinion 44 longitudinally of the screw shaft 56 in restrained. Consequently, the internal projections on the pinion wedgeagainst the side of he threads onthe screw shaft 56 and the pinion rotates with the shaft, thereby rotating the annular gear 36 and causing longitudinal movement of the rack 39 through the pinion 43, which movement of the rack rotates the annular gear 35 through the pinion 42 in a direction opposite to that of the gear 36. lVhen the instrument is tuned and the shaft 56 is released, the casting 28 is returned to its initial position by the aforementioned spring 60.

The motor is connected to the shaft 56 for; rotation thereof through reduction gearing and an automatic clutch. The shaft of the motor is coupled by means of a pin 7 O to a hollow shaft 71 which is journaled in bearings 72 and 73 supported by the base plate, the shaft being enlarged on the right of the bearing 73 (Fig. 4) to form a shoulder which abuts against the side of the bearings to prevent longitudinal movement of the shaft to the left. On the left of the bearing 73, there is a collar 74 screwed on to the shaft, which is threaded for this purpose, and fixed stationary with respect thereto by a set screw 75. Cu the right of the bearing 72, a collar 76 is fitted which is slidable longitudinally with respect tothe shaft and restrained from relative rotational movement by a pin 77 eX tending through a slot formed in the shaft 71. The .

collars

74 and 76 are connected together by means of links 78 secured at one end to pins extending between ears'formed on the peripheries of the collars and on the other end to weights 79. Thus, as the shaft revolves, the weights are thrown outwardly by centrifugal force and the collar 76 is drawn to the left. This movement of the collar 76 is imparted to a rod 80 which abuts against the pin 77 and extends-longitudinally through the center of the shaft beyond the end thereof.

A worm 81 at the end of the shaft 71 meshes with a worm gear 82 secured to a hollow shaft 83 journaled in a bearing bracket 84. The shaft 83 is in alignment with the screw shaft 56 and has mounted on the end thereof opposed to the end of the'shaft 56, the cone 85 of a cone clutch, the complementary part 86 of the cone 85 being secured to the end of the shaft 56 by a pin 87. The cone 85 which comprises a cup shape hub and a frusto conical section of flexible material is slidably mounted on the end of the shaft 83 and splined thereon to rotate therewith. EX- tending through the hollow shaft 83 there is a rod 88 which abuts against the hub of the cone atone end and is adjustably connected to a lever 89 at the other end beyond the end of the shaft. The lever 89 is connected to the upper end of a vertical shaft 90 ournaled in a bearing bracket 91. A second lever 92 is secured at the lower end of the shaft 90 at one end and abuts against the end of the rod 80 protruding beyond the end of the shaft 71. Through this arrangement, movement of the rod 80 is imparted to the rod 88 which shifts the cone 85 into engagement with the complementary part 86 on the end of the screw shaft 56, thereby'connecting the motor to the screw shaft for rotation thereof. Vhen the motoris not operating, the shaft 56 is free, the clutch being resiliently released.

A modified form of the gearing connecting the motor to the screw shaft is shown in Figure 5. In the form shown in Figure 5, the motor shaft and the screw'shaft are aligned and consequently a singlerod 93 serves the purpose of actuating the clutch which is actuated by the centrifugal control as before. In this modified form the alignment of the screw shaft and the motor shaft is made possible by the use of planetary reducing gears. The shaft 71 is extended and has an eccentric 94 formed on the end thereof. Two gears 95 and 96 of different diameters and connected together (shown as integral) are rotatably mounted on the eccentric9 1. The gear 95 meshes with an annular gear 97 secured to the stationary gear housing 98 by means of screws 99. As the shaft 71 rotates in one direction, the gear 95 rotatesin the opposite direction at a reduced speed. Rotation of the gear 95 rotates the gear 96 which meshes with an annular gear 100 secured to a-shaft 101 carrying the cone of the clutch. The connection between the gears 96 and 100 effects a further reduction in the speed of rotation.

The electric circuits and the mechanism for controlling the motor from the remote point will now be described. The controller box and mechanism which are situated at the remote point are illustrated in Figs. 7 to 10, inclusive. The box 102 has a cast back and sheet metal sides and front with an outlet for the cable in an end wall. Two parallel transverse guide shafts 103 and 104 are disposed in the box near the front. A casting 105 slides on these shafts, the portion which bears on shaft 103 being bifurcated and including between its two members the hub of a curved contact-operating bar 106, the end of which projects out through a slot 107 in the front face of the box 102 and has on its end a manipulating knob or handle. The bar 106 is thus pivoted on the shaft 103 and is constrained in lateral movement to travel with the casting 105. A coil spring 108 connects an arm on the bar 106 beyond its pivot point with an arm on the casting 105 and serves to urge the bar 106 outwardly into the position shown in Fig. 9. The top of the slot 107 is provided with a series of ten notches corresponding to the notches on the guide shaft 30, and above the slot 107 is a stationindicating strip 109 with the numerals of ten stations arranged immediately above the. respectivenotches in the slot 107 and corresponding to the stations indicated on the strip 47 on the front panel of the set. I

The electrical circuits are so arranged that when the operator moves the bar 106 laterally into register with any one of thestations indicated on the strip 109 and depresses the lever, a solenoid 65 corresponding to the-said station will be energized and attract its lever into the path of the casting 28 and the motor will simultaneously be energized. Thisis effected through the series of switches against the back of the box 102. As shown, there are two series of switches, a bottom series 110 which is a comb-shaped conductor strip as shown in Fig. 10 with ten individual contact strips; and an upper series.111 often sepa rate and insulated strips. The two series are disposed in pairs, one immediately above the other, and the depression of the bar 106 serves to move the contact point of the strip 111 with which it registers into contact with' the contact point on the strip 110 immediately below it, and a continued movement of: the bar 106 presses the lower contact strip against a contact point on the bar112 which runs underneath all of the contacts. Lamps 113 and 11% are supported onabracket upon the side wall. of the box immediatelybehind .a red lens 115 and a green lens 116 in the front face. A three-wire switch button is also provided in the side wall of the box] The electrical circuits are shown-in the diagram of Fig. 11. A six and twelve volt source of current is supplied from the secondary of the transformer 117. One side of the six volt source which is common to the: twelve volt source is connected by: a wire 118 to one side. of the lamp 113 and the upper contact bar 110, the other side of the six volt circuit being connected to the solenoids 65 which are connected in multiple and the other side of the twelve volt circuit being connected to the lamp 113 by the wire 119. The switch members 111 are respectively connected to the illdividual solenoids, thereby completing 'the circuits to the. individual solenoids from the six volt supply. The lamp-114 is connected on one side to the upper contact bar 110-and on the other to the rackswitch 39?) by a wire 120, the other side of which is connected: to the twelve volt circuit by awire 121. The motor 55 is connectedby a wire 122 to the wire 121 leading from the twelvevolt terminal of the transformer 117, and bya wire'123to the lower contact bar 112 in the control box. The receiving set- 12 1 is connected in multiple with the transformer to the high voltage source of current through the three way switches 125 on the remote control box and the three way switch 126' at the set.

If it is desired-to tune in the set from the remote. point, the operator at the box 102 will first push the switch button 125. This will turn on the set. He next moves the bar .106 over to a notch above which are the. initials of the station to which he wishes to attune the set. He then depresses the bar 106 and a guide strip on the upper side of the bar with a V-shaped end enters theslot and guides. the,

into the path of the casting 28.

movement of the bar 106 brings the contact bar exactly centrally of the slot and thus exactly in register with the pair of

contacts

110 and 111 beneath it. The depression of the bar first brings the

contacts

110 and 111 together and the circuit through the solenold 65 is thereby closed and the solenoid isenergized from the six volt source of current. The abutment lever 62 isthereby inserted Further strip 110 into engagement with the bar 112 and this serves to close the motor circuit. The motor thereupon starts to rotate and when it has reached a predetermined speed 'it is connected to the screw shaft 56 through the clutch 85 by the action of the centrifugal control 79. Rotation of the shaft Causes the casting 28 to move laterally through the action of the pinion a l until it strikes the abuti the gear 36 and through the pinion 43, rack 39 and pinion 4L2 rotation of the gear in the opposite directlon and longitudinal movement of the rack. As the rack moves to the forward position the contactor 39b touches breaks the circuit to the motor and the solenoid and releases the shaft 56 from connection with the motor. To turn off the set it is only necessary to push either one of the buttons 125 or 126. I

It will be observed that the tuning of the set from the remote point in no wise interferes with the usual tuning of the setand that the tuning may be changed at will from either point.

It is obvious that various changes may be made in the illustrated embodiment of my invention above particularly described within the principle and scope of my invention as expressed in the appended claims.

I claim:

1. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith. a sin le ooeratin l b member for the several actuating members shiftable selectively into engagement therewith, motor, and means operatively connecting the motor to the operating means including means for shifting the operating member.

2. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, a motor, means operatively connecting the motor to the operating means including means for shifting the operating member, selector devices governing the shift ing of the operating member to control the position of the shift, and manually operating means for the selector devices.

3. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, a screw shaft for shifting the operating member, and an electric motor in control of the shaft.

4. In a radio receiving set, a movable'member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, a screw shaft for shifting and actuating the operating memher, and an electric motor in control of the shaft. I

-5. In a radio receiving set, a movable member operatively connected to the tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, a screw shaft for shifting and actuating the operating member, an elect io motor in control of the shaft, manually operating means for controlling the energizing of the motor, selector devices governing the shifting of the operating member to control the position of the shift, and manually operating means for the selector devices.

6. In a radio receiving set, a shaft operat' ely connected to a tuning element of the set, an actuating pinion on the shaft, operating means for the pinion including a rack, means on the rack for manual manipulation, a pinion for actuating the rack, an electric motor operatively connected to the pinion,

and a manual switch for controlling the energization of the motor.

7. in a radio receiving set, a movable member operatively conn'ected'to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, operating'means for effecting the shifting and operation of said operating member, an electric motor, and an automatic clutch for controlling the connecting of the motor to said operating means.

8, In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adj ustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, operating means for effecting the shifting and operation of said operating member, an electric motor, and an automatic clutch under the control of the motor for controlling the connecting of the motor to said operating means.

9. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, operating means for effecting the shifting and operation of said operat ing member, an electric motor, an automatic clutch under the control of the motor for controlling the connecting of the motor to said operating means, and manually operating means for controlling the energization of the motor.

10. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjust-able connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, operating means for effecting the shifting and operation of said operating member, an electric motor, and an automatic clutch actuated by a centrifugal device for connecting the motor to the operating means.

11. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuo J members shiftable selectively into engagement therewith, operating means for effecting the shifting and operation of said op erating member, an electric motor, an automatic clutch actuated by a. centrifugal device for connecting the motor to the operating means, and means for returning the operating means to its initial position upon actuation of the clutch to disconnect the mot-or from the operating means.

12. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, a single means for first shifting the operating member into its selective engagement with the actuating member and then operating the operating member, and an electric motor adapted to be connected to said means.

13. In a radio receiving set, a tuning device comprising a movable member opera-- tively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, an operating pinion connected to the operating member for operation thereof and secured to the operating member against relative lateral movement therebetween, a screw shaft extending through the operating pinion and journaled in the tuning device so as to prevent aXial movement thereof, internal pro j ections on the operating pinion engaging the threads in the screw shaft for first advancing the operating member into its selective engagement with the actuating members upon rotation of the screw shaft and then frictionally engaging the sides of the threads in the shaft to rotate the pinion therewith for operation of the operating member, and a motor .operatively related to the screw shaft.

let. In a radio receiving set, a tuning de-. vice comp *ising a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connec: tion therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, an operating pinion connected to the operatingmember for operation thereof and secured to the operating member against relative lateral movement therebetween, a screw shaft extending through the operating pinion and journaled in the tuning device so as to prevent aXial movement thereof, internal projections on the operating pinion engaging the threads in the screw shaft for shifting the operating member upon rotation of the screw shaft, abutments movable selectively into the path of the operating member to control the position of shift and cause the projections on the operating pinions to frictionally engage the sides of the threads on the screw shaft for rotation of the pinion, and manually operating means for the abutments.

15. In a radio receiving set, a tuning device comprising a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, an operating pinion connected to the operating member for operation thereof and secured to the operating member against relative lateral movement therebetween, a screw shaft extending through the operating pinion and journaled in the tuning device so as to prevent axial movement thereof, internal projections on the operating pinion engaging the threads in the screw shaft for first advancing the operating member into its selective engagement with the actuating members upon rotation of the screw shaft and then frictionally engaging the sides of the threads in the shaft to rotate the pinion therewith for operation of the operating member, an electric motor, means for connecting the motor to the screw shaft including an automatic clutch under the control of the motor, and manually operating means for controlling the energization of the motor.

16. In a radio receiving set, a tuning device comprising amovable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, an

operating pinion connected to the operating member for operation thereof, and secured to the operating member against relative lateral movement therebetween, a screw shaft extending through the operating pinion and journaled in the tuning device so as to prevent axial movement thereof, internal projections on the operating pinion engaging the threads in the screw shaft for shifting the operating member upon rotation of the screw shaft, an electric motor for rotating the screw shaft, abutments movable selectively into the path of the operating member to control the position of shift and cause the projections on the operating pinions to frictionally engage the sides of the threads on the screw shaft for rotation of the pinion, and manually operating means for the abutments and for controlling the energization of the motor.

17. In a radio receiving set, a tuning device comprising a shaft operatively connected to a tuning element of the set, a plurality of actuating pinions on the shaft, a single operating member including a rack for the several pinions shiftable selectively into engagement therewith, an operating pinion connected to the rack for operation thereof and secured to the operating member against relative lateral movement therebetween, a screw shaft extending through the operating pinion and journaled in the tuning device so as to prevent axial movement thereof, internal projections on the operating pinions engaging the threads in the screw shaft for shifting the operating member laterally upon rota-tion'of the screw shaft, an electric motor for rotating the screw shaft, an auto matic clutch connecting the motor to the screw shaft when the motor is operating, abutments movable selectively into the path of the operating member to control the position of the shift and cause the projections on the operating pinion to frictionally engage the sides of the threads in the screw shaft to rotate therewith, and manually operating means for the abutments and controlling the energization of the motor.

18. In a radio receiving set, a tuning device comprising a shaft operatively connected to a tuning element of the set,'a plurality of actuatingpinions on the shaft, a single operating member including a rack for the several pinions shiftable selectively into en gagement" therewith, an operating pinion connected to the raclrfor operation thereof and secured to the operating member against relative lateral movement therebetween, a screw shaft extending through the operating pinion and journaled in the tuning device so as to prevent axial movement thereof, internal projections on the operating pinions engaging the threads in the screw shaft for shifting the operating member laterally upon rotation of the screw shaft, an electric motor for rotating the screw shaft, an automatic clutch connecting the motor to the screw shaft when the motor is operating, abutments movable selectively into the path of the operating member to control the position of the shift and cause the projections on the operating pinion to frictiona-lly engage the sides of the threads in the screw shaft to rotate therewith, manually operating means for the abutments and controlling the energization of the motor, and means for returning the operating member to its initial position when the screw shaft is released by the automatic clutch.

19. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, operating means for effecting the shifting and operation of said operating member, an electric motor, and a clutch for connecting the motor to said operating means to operate the same.

20. In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a power device selectively connectible to the several actuating members to operate the same, manually controlled means for selectively connecting the power device to the several actuating members, a pilot light, a switch controlling the energization of the pilot light, and means for closing the switch upon actuation of the actuating members.

21, In a radio receiving set, a movable member operatively connected to a tuning element of the set, a plurality of actuating members for the movable member having adjustable connection therewith, a single operating member for the several actuating members shiftable selectively into engagement therewith, a power device for effecting the shifting and operation of said operating member, manually controlled means for connecting the power device to said operating member, a pilot light, and a switch for controlling the energization of said pilot light, said switch being adapted to be closed by'the operation of said operating member.

In Witness whereof, I hereunto subscribe my signature.

LOUIS H. MORIN.