US2219919A

US2219919A - Remote control for radio receivers

Info

Publication number: US2219919A
Application number: US223497A
Authority: US
Inventors: Donald C Fierce
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-08-06
Filing date: 1938-08-06
Publication date: 1940-10-29
Anticipated expiration: 1957-10-29

Description

Oct. 29, 1940. D. Q PIERCE 2,219,919

REMOTE CONTROL FOR RADIO RECEIVERS Filed Aug. 6, 1958 '7 Sheets-Sheet l @gym 7. @Bj l ATTORN EYS Oct. 29, 1940. D. c. FIL-:RCE

REMOTE CONTROL FOR RADIO RECEIVERS Filed Allg. 6, 1958 7 Sheets-Sheet 2 INVENTOR Fierce WITNESSES onald C.

29 BY I 0MM M MSQNEYS Oct. 29, 1940.

D. c. FllERcE REMOTE CONTROL FOR RADIO RECEIVERS Filed Aug. 6, 1938 7 Sheets-Sheet` 3 WITNESSES ATTORNEYS Oct. 29, 1940. n. c. FlERcE REMOTE CONTROL FOR RADIO RECEIVERS Filed Aug. 6, 1938 7 Sheets-Sheet 4 l INVENTOR WITNESSES ATTORNEYS Oct. 29, 1940.

D. c. FIERCE REMOTE CONTROL FOR RADIO RECEIVERS Filed Aug. 6, 1938 7 Sheets-Sheet 5 @F4/ig EE l ////////l///ll//ll/l/l//////////////////////// WITNESSES lNyEN-roR S d ai m L Oct. 29, 1940. l Dl Q FlERC 2,219,919

REMOTE CONTROL FOR RADIO RECEIVERS Filed Aug. 6, 1938 '7 Sheets-Sheet 6 29%' /z'ge" REMOTE soggc SUPPLY Q T0 OTHER SPEAKERS TELEPHONE DIAL QR MLS 05 4 INVENTOR Donald C. Fwrfce WTNESSES Oct. 29, 1940. D C PIERCE 2,219,919

REMOTE CONTROL FOR RADIO RECEIIVERS Filed Aug. 6, 1958 '7 Sheets-Sheet 7 wrrusss s NVENTOR ,onczlcl CCFz/ervce m I i y* hm ATTORNEYS Patented Oct. 29, 1940 UNITED STATES PATENT OFFICE Application August 6,

9 Claims.

This invention relates to controlling devices for radio receiving sets and particularly to an improved compact electrically actuated remote control, an object being to provide a construction which will accurately control the tuning of a radio receiving set from one or more remote points as well as` at the receiver.

Another object of the invention is to provide a remote control device which may be easily actuated by the operator and which will accurately tune to the various selected stations.

A further object of the invention is to provide a remote control device for radio receiving sets which is adapted to have the principal parts mounted on the receiver and the other parts extending to any desired distance so as to be controlled and manipulated from a distance with the parts adapted to tune or move the condenser in either direction for selecting a desired station.

In the accompanying drawings- Fig. 1 is a front view of the principal part of the device embodying the invention, the cover and dial pointer being removed;

Fig. 2 is an enlarged view of the structure shown in Fig. 1, a tuning condenser being shown in dot-and-dash lines;

Fig. 3 is a plan View ofthe structure shown in Fig. 2, part of the casing being shown in section;

Fig. 4 is a side elevation showing the opposite side'of the device to that illustrated in Fig. 2, the cover and certain parts being eliminated;

Fig. 5 is a perspective View of a pair of armatures with a non-magnetic connecting member;

Fig. 6 is a perspectiveview on a reduced scale of the structure shown in Fig. 5 associated with a magnet embodying certain features of the invention;

Fig. '7 is a sectional view through Fig. 2 approximately on the line 1 1, showing a detail stepby-step switch, cam, and cam holding means;

Fig. 8 is a sectional view through Fig. 7 approximately on the line 8--8;

Fig. 9 is a detail view of the step-by-step switch shown in Fig. '7;

Fig. 10 is a detail view partly in section and partly in elevation showing a cam holding mechanism embodying certain features of the invention;

50 Fig. 11 is a View showing in elevation a brush embodying certain features of the invention;

12 is an elevation of the tuning wheel, the connection to the tuning condenser, and the onand-off switch structure;

Fig. 13 yis a top plan view with certain connec- 1938, Serial No. 223,497

(Cl. Z- 20) tions in section and illustrating a hand control switch;

Fig. 14 is a side view of the structure shown in Fig. 13;

Fig. 15 is a View of the structure shown in Fig. 14 on the opposite side and illustrating the three control buttons;

Fig. 16 is a sectional view through Fig. 15 approximately on the line lB-I 6;

Fig. 17 is a diagram of the circuit;

Fig. 18 is a fragmentary perspective view showing the swinging arm and an armature and associated parts illustrated in Fig. 1;

Fig. 19 is a detail perspective view of a ratchet wheel and brushes illustrated in Figs. 1 and 2;

Fig. 20 is an end view of the ratchet wheel shown in Fig. 19 and illustrating the various springs and spring contacts shown at the right in Fig. 18 and also shown at the center in Fig. 2.

Referring to the accompanying drawings by numerals, l indicates a frame which may be of any desired material, as for instance a non-magnetic metal such as aluminum or zinc alloy. This frame is secured in place on a receiver in any suitable way, as for instance by a number of screws 2.

Also the structure shown in Figs. 1

and 2 is preferably mounted on the receiver at the usual place occupied by the dial.

This makes or receiver.

The condenser 3 may be tuned electrically cr by hand independently of the volume control 4, which also may be tuned by hand at the receiver or electrically at a remote point. Preferably when it is desired to set a station on the remote control the shaft 5, shown in Figs. 1 to 7 and l0 is rotated to a position where the finger 5 enters a depression 'l in the enlarged portion 8 of shaft 5 and then the cam shaft I8 and the tunerl condenser 3 are manually rotated to tune in the desired station. Preferably the shaft 5 (Fig. 10) is provided with a hand-operated knob 9 and a pointer l0 adapted to move over a scale on a casing Il.

It will be noted from Fig. 7 that the finger S moves on a pivotal pin l2 and is urged by a spring I3.

When the finger 6 moves into the notch or depression l it will swing the arm i4 so that the notch I5 formed therein will move over the stop IE preferably pressed out from the cam I1.

notch l at a given point.

It will therefore be seen that the arm I4 serves to hold the cam I1 stationary while the cam shaft I8 and the tuning condenser 3 are manually rotated to tune in the station.

The cam shaft I8, as shown in Figs. 1, 7 and 8 and the upper part of Fig. 17, carries a number of cams I'i". Illustrated particularly in Fig. 8, there is provided a cam for each wave length that is to be tuned to electrically. In the accompanying drawings there are shown ten in the circuit (Fig. 17) and the detail arrangement of the parts is illustrated in Fig. 8. Between the respective cams, which are rotatably mounted on the various sleeves I 8 and I 8, there are substantially fiat spider formations 11, which are rigidly connected by keys, solder, or other means to shaft i6 between the sleeves or rings I8" and the sleeve I8 so as always to rotate with shaft I8. The various cams I1, however, are individually freely rotatable on the rings I8", though ordinarily they do not do so because of the friction of the spiders 'Il' which are tensioned against the flat surface of the `respective cams. It will be noted from Fig. 7 that each cam is provided with a small arc-shaped portion 18 and a large arcshaped portion 19 with offsets or cam sections 80 and 8i connecting these arc-shaped portions. As shown particularly in Figs. l and 2, shaft 42 has an end journaled in the end of stub shaft 42' and connected to said stub shaft by a spiral spring 66. The stub shaft 42 is secured to shaft 42 which is secured to gear wheel 61, which gear wheel is in continuous mesh with gear wheel 68 and gear wheel 6B, through a suitable shaft and miter gear structure 69, is connected to shaft 10 to which a gear wheel 1I is rigidly secured. By reason of this construction, whenever motor 2| starts to function it will move the shaft 22 longitudinally to the left against the action of spring 22 and, consequently, it will move the pinion 12 into mesh with the gear wheel 1I. It is to be noted that motor 2| is a well-known structure of the kind that is reversible so as to be readily operable in either direction. It will be seen, therefore, that when the pinion 'I2 secured to shaft 22 is in mesh with gear wheel 1I, power will be transmitted through the miter gear 69 to pinion 68 and then to gear wheel 61. From gear wheel 61 motion will be transmitted from the shaft 22 for rotating the pinion 46, as shown in Fig. 2. From this arrangement it will be readily seen that the action of magnet 21 and armature 29 will shift pinion 46 by the rocking of the bar 30 over into engagement with the gear wheel 41 and then the rotation of the motor 2| will give the parts the required rotary movement to secure the desired tuning action. When the armature 29 (Fig. 18) is attracted by magnet 21, pinion 46 will swing over into engagement with gear wheel 41 3 and when the armature 29 is released the pinion 46 will automatically swing back into mesh with the gear wheel 48.

Referring again to Figs. 1, 2 and 18, it will be seen that the rotatable shaft 42 extends through a slot 43 in block 36 and rotatably extends through a spring 44, which spring is secured at 45 to arm 33. This allows a slight independent movement of block 36 and arm 33 to the left when the pinion 46 rigidly secured vto shaft 42 is moved over against either of the bevel gears 41 2, the pinion 46 is in mesh with the gear Wheel 48, which gear wheel is loosely mounted on a tubular stub shaft I which may be an integral extension of frame I. A small pinion 59 is also loosely mounted on the tubular stub shaft I', but rigidly secured to gear wheel 48. The pinion 56 is continually in mesh with a large gear wheel 5I which is rigidly secured to a shaft 52. 'Ihe arm 23 is also rigidly secured to shaft 52 so that when gear wheel 5I rotates in either direction arm 23 will be swung accordingly. A pulley 53 is likewise secured to shaft 52 and coacts with a pulley 54 rigidly secured to a shaft 55. The shaft 55 is connected with the volume control 4 so that when it is rotated the volume will be increased or decreased according to the direction of rotation. The

belt portions

56 and 51 of a divided belt are secured to the

respective pulleys

53 and 54 and are wound in opposite directions thereon so that when one belt is being wound on a given pulley the opposite belt is being unwound therefrom. This arrangement permits a ready and convenient way of moving the volume control 4, which may be of any desired kind and also by reason of the pulley sections may be arranged at any convenient point on the receiver. This arrangement permits the volume control 4 to be rotated more than 180 and, if desired, could be arranged to rotate the control 360.

The shaft 55 may be provided with a knob and operated manually if desired. The shaft 49 also may be provided with a knob operated manually if desired. The bevel gear 41 is rigidly secured to shaft 49 so that when the arm 33 is swung to the left, as shown in Fig. 2, pinion 46 moves out of mesh with gear wheel 41. When pinion 46 and gear 41 are in mesh and pinion 46 is rotated, shaft 49 will be rotated to produce the desired tuning.

It will be observed (Fig. 2) that a friction pulley 58 is secured to shaft 49 and frictionally .engages a comparatively large disk or wheel 59 which is secured to shaft I8 carrying the pointer 6I on the face of the device. A substantially S- shaped resilient exible coupling 62 (Fig. 12) is secured at 63 and 64 to the disk 59 and also to the tuning shaft 65 of the condenser 3. By rotating the shaft 49 the required distance the desired tuning may be secured. This may be accomplished electrically or manually.

After the arm I4 has been swung to the right, as shown in Fig. 7, to engagement with the stop or abutment I6, the cam I1 connected therewith will be held stationary while the cam shaft I8 and the tuning condenser 3 will be manually rotated to tune in the desired station. If the stop or abutment I6 is not in position to .engage the notch I5 in the arm I4, it will be necessary to rotate the tuning element until the parts are in registry. This may be done electrically. since the point where the cam stops the rotation of the tuning condenser 3 when it is used to bring in a station, is that in which the abutment I6 is diand 14 lose contact with the cam I1. At this point the brush 13 rests against the insulation- 15 and the brush 14 rests against the insulation 16. The shaft 5 is then rotated manually back to a neutral position, as shown in Fig. 7, when the control has been properly set to control a station.

The ratchet wheel 35, as shown in Figs. 7, 19 and 20, is connected directly to the

brushes

91 and 98 which move over the contact bars II and I I I and at different times move into engagement with the

respective contacts

13 and 14. When the spring and pawl 34, as shown in Figs. 2 and 18, is vibrated to move the ratchet wheel step by step, the respective pins 9| and 92 are moved around and eventually into engagement with the depressed parts or sockets 4|' and 96 whereby the contact 96 is separated from the contact spring 93 and the contact spring 4I is separated from the contact spring 39 and brought into engagement with the contact spring 38.

From Figs. 18 and 20, it will also be readily observed that when the bar 39 is rocked .by the magnet 21 attracting the armature 29, the rod of insulation 31 will be pulled and the spring arm 49 will be moved so as to separate its engagement with spring contacts 93 and also to move the contact arm 39 into engagement with arm 4| and arm 38 out of engagement with arm 4 I.

Referring more particularly to Fig. 17 of the drawings, it will readily be seen that several remote speakers could be operated by a push button structure, as shown in Figs. 15 and 16, or other suitable means. The push button structure shown in elevation and in section in Figs. 15 and 16 presents a very convenient and desirable construction for portable use as it shows a unit small enough to be held in the palm of the hand of the operator and be readily operated by the thumb of the same hand.

Ii dynamic speakers are used at remote points direct current for energizing the eld magnets may be taken from a common source or from a rectifier which may be switched on and off with the receiver. The speakers are preferably equipped with what may be termed lock-in contact springs, as shown in Fig. 17, in which member 82 is a small armature before the face of the pull piece of the speaker 83. This armature is attached through the insulating rod 84 to a spring 85. When the speaker field 26 is energized the

contacts

86 and 81 close. When this occurs contacts 86 and 88 break while

contacts

89, 99 and 88 close.

By momentarily pressing the button I9 of the push button control unit, shown in Figs. 15 and 16, a circuit is closed through the speaker eld 26 which establishes suicient ilux to attract the armature 82 and lock in the associated contacts above described. When the receiver is switched off all of these contacts are released. It should be understood, therefore, that the speaker may be cut-in from any of the remote stations associated with it and that other speakers may be cut-in at remote stations associated with them, and that all speakers are cleared of the system by switching the receiver off from any point.

When the button I9 (Fig. 17) has been pressed the motor 2| will be started and certain actions will take place. When the button I9 is released the magnet 21 will be deenergized but the remote speaker iield 29 will be locked in through the

contacts

86 and 91. The armature 29 and the pawl 34 rotate the ratchet Wheel 35 (Figs. 2 and 20) one tooth so that the projecting pins 9| and 92 act on the contact springs 4I and 96 for disengaging them. The pins 9| and 92 may be of insulating material or of metal and mounted on insulating material. The armature 28 will also be released and if no station is to be selected at this time the alternating current to the motor 2| through the contact spring 4I and

contacts

39, 94 and 95 will be closed. However, when the motor 2| attempts to start it will trip the springactuated arm 96 which will move contact 96' (Figs. 2 and 17) into contact with the spring 93 and thus cause the magnet 21 to vibrate the armature 29. This action is continued so as to produce a making and breaking of contact springs or

members

49 and 93. This will cause the pawl '34 (Fig. 2) to function and move the ratchet vheld operated and the contacts |96 and |91 are held separated during this vibration by a weak current passing through the resistance 99 (Fig. 17) and the condenser |99 and also resistance |9I to prevent radiation of the make-and-break current over the external control wires. In case it is desired to select a station immediately after the receiver is switched on, the button I9 will be vibrated in order to give a series of impulses corresponding to the desired station. From Fig. 17 it will be seen that when the button I9 is depressed to close the contact 29, the Contact |92 also closes, but when the button |93 is depressed to close contact |92, contact 29 does not close.

It will also be observed that a weak current is kept flowing through the magnet 21 and resistances |94 and |95 to hold the armature 28 operated during the series of impulses which are being made with the button I9. Upon the full release of button I9, armature 28 will be deprived of current and establish a direct current circuit through the magnet 21, contacts |96 and |91, magnet IIS, magnet |98, or wire |99, depending upon which of the

brushes

13 or 14 is in contact with the cam I1, arcs III! and III of the step-by

step switch brush

91 or 98,

brush

13 or 14, cam I1, and shaft I8 to the ground. This operates structure I i4 and holds the armature 29 in a nonoperated position by the action of magnet II3 on armature H4. The motor 2| starts and rotates the cam assembly and tuning condenser to bring in the desired station, the direction of rotation being controlled by the contacts II5, 94 and 95, the latter two being under control of the armatures 28 and I I2. When the circuit is broken at the

same brushes

91 and 98, the armature 28 immediately operates and the step-bystep switch is returned to normal as heretofore described.

IReferring more particularly to Figs. 14. and 15, it will be seen that the push buttons I9, |93 and II6 are mounted for convenient use when the assembly is held in the hand. It will also be noted that the contact 29 is very short while the contacts II9 and |92 are comparatively long.

vvFrom Figs. 15, 16 and 17 it will be seen that there has been provided three metal springs, namely, springs I9', |29 and II6', all electrically connected together and preferably made from a single piece. Spring |29 is tensioned to move into contact with pin 492. YSpring I9 is tensioned to move in an opposite direction to spring I 29 and is provided with an extension I2I projecting beneath spring |29 for normally holding the same out of contact with pin |92. When the button I9 is depressed spring |29 will be released so that it will immediately contactpin |92. When the button IIE is depressed only the contact Il9'will be engaged. In tracing the various circuits it wiil be observed that when the button I9 is depressed alternating current will be drawn from any suitable supply through the wires I 23 and |24.

1n the lower left-hand corner or" Fig. 17 a diagram indicating a telephone dial is presented which illustrates how a telephone dial may be used instead of the switch buttons I9, |93 and I |6. When using the telephone dial, contacts I 5| and |52 close when the dial is moved from a normal or inoperative position and remain closed until it returns to that position. The contacts |49 and |59 also remain closed while the dial is rotated manually but make and break as the dial returns to normal, while the push buttons 29' and I I9 serve to adjust the volume. It will be understood that as the dial is swung olf normal to select a station, the receiver is switched to the on position if at the off position. As the dial returns it interrupts the direct current established through the magnet 21 so as to serve the same purpose as the push buttons |93 and I9. The resistances |54 and 99 have a value equal to the combined resistance of resistance coils |84 and |95 or coils |94' and |65.

The various circuits of the various parts are shown in diagram in Fig. 17 to which reference is now made. When button I9 is depressed alternating current flows through a circuit including the winding 26. Assuming that the switch 24 is open or in the off position and starting with contact 29, after button 9 has been depressed, alternating current will iiow through wire |25 to contact 88, contact member 86, wire |26, winding 26, wire |21, wire |28, wire |29, contact post |39, switch blade |3I, contact post |32, wire |23 to alternating current generator, and from the generator (not shown) to wire |24, through resistance |33, wire |34 to winding section |35 of motor 2|, wire |36, wire |31, post |38, switch blade |39, wire |49, wire |4| to contact 29. Current flowing in this circuit will cause motor 2| to function thereby throwing the switch 24 to the on position. This will cut out the supply of alternating current and turn on the direct current from the rectier 25 or from an outside source if switch |42 is closed or at the on position. If this switch is in the off position direct current will be supplied by the rectifier 25. While this is taking place the pawl 34 and associated parts have functioned for causing contacts 93 and 96 (Fig. 20) to close and contacts 38 and 4I to open and

contacts

39 and 4| to close. Di rect current will then flow from the rectier 25 to the ground and then to contact 96, through contact 96', contact spring 93, contact spring 49, wire |43, wire |44, windings of magnet 21, wire |55, wire |46, and wire |41 back to the rectifier 25. Direct current flowing in this path will energize magnet 21 and cause this magnet to attract

armatures

28 and 29. The attraction of armature 29 will cause arm 33 to swing to the left, as shown in Fig. 2, and as heretofore set forth. The attraction of armature 28 will cause the rod |48 to swing contact |81 away from contact |66 and at the saine time swing contact 95 away from contact 94 and move contact 95 into engagement with contact ||1 and contact I|1 into engagement with contact I I8. When the coil 26 is energized by direct or alternating current it attracts armature 82 and pulls rod 84 to open engagement with contact 86 and close with

contacts

99 and 69. Also

contacts

86 and 81 will close by reason of the spring action ofcontact 86.

When it is desired to use the device the switch button I9 shown in Figs. 15, 16 and 17 is depressed so as to close the Contact 29. When this is done the resilient action of contact |29 will cause contact |20 to engage contact |02. 'Ihis connects the motor 2| to a source of alternating current and causes the motor to immediately start and rotate the shaft 22 (Figs. 1 and 2) in the proper direction to move an arm 23 (Figs. 2 and 12) into engagement with a switch 24 (Fig. 12) so as to move it to the on position. At this time a condenser 25 (Fig. 17) provides a shunt path around a high resistance speaker field 26 for the alternating current, but as soon as the direct current from the rectier 25' is established in the receiver it acts as a filter condenser. It will also be noted that the magnet 21 (Fig. 6) and the remote speaker eld 26 are energized in series so that the

respective armatures

28, 29 and 82 are attracted. The attraction of armature 29 swings the bar 30 (Figs. l, 2 and 18) whichis pivotally mounted at 3| and 32 and as this bar is rigidly securedto an arm 33 said arm will be swung to the left, as shown in Fig. 2, until the resilient pawl 34 is moved sufficiently to engage the next tooth on the ratchet wheel 35 (Fig. 2). The bar 3|), the arm 33 and the bar 36 are preferably made in one piece. As arm 33 is rigidly secured to the block 36 as well as to the pawl 34, this block will be moved to the left, as shown in Fig. 2, so as to pull the rod 31 which is preferably made of insulating material. This rod preferably extends loosely through the contact springs 38, 39, 48 and 4| and is provided with abutments 38', 39 and 40', which simultaneously engage the respective springs and pull them to the left, as shown in Figs. 2 and 20. It will be understood, therefore, that when the arm 33 swings to the right, contacts springs 38 and 4| will be separated. Immediately before the rod 31 functions, switch 24 will open and break the motor circuit.

In tracing the circuit when button I9 is depressed and starting with Contact 29, alternating current will flow through Wire |4I, |48, switch blade |39, contact |38, wire |31, wire |36, winding |35 of motor 2|, wire |34, resistance |33, to wire |24 and then over wire |23, post |32, switch blade I3I, wire |29, wire |21, winding 26 and condenser 25, wire |26, through spring 86, contact 88, wire |25 back to button I9. Alternating current flowing in the path just described will operate motor 2| and rotate shaft 22 and move shaft 22 to the left, as shown in Fig. 1, until the gear 12 meshes with gear 1I. Power is transmitted from gear 12 through the miter gear B9, pinion 68 (Fig. 2), gear 61 and shaft 42' to shaft 42 for rotating pinion 46 which is in mesh with the bevel gear 48. This gear (48) is secured to pinion 50, which is continually in mesh with gear 5| secured to shaft 52 carrying arm 23 which is swung for moving the switch 24 to the onl position. This turns on the direct current. As soon as the direct current has energized winding 26, armature 82 will be moved over to the left, as shown in Fig. 17, and will move spring into engagement with contact 9|] and contact into engagement with contact 89. This will open the circuit at Contact 88 but direct current will continue to flow by passing through wire |21 to spring arm 90, spring arm 85, wire |25, back to button I 9. When armature 82 is attracted by magnet 26, current will flow from the rectifier 25 to the ground, through the ground to switch arm |39', wire |56, switch post |30, wire |29, wire |28, wire |21, winding 26, wire |26, spring arm 86, contact 81, wire |53', switch |42, to wire |42', wire |46, wire |41, back to rectifier 25. Current flowing in the circuit just described maintains the winding of the speaker 26 energized for operating the same. If the button I9 is held down after switch 24 has been moved to the "on position, direct current will begin to flow. If the button I9 is held down as just described, direct current will flow through a circuit including the winding of magnet 21 and winding 26 and will cause the rod 31 to move to the left, as shown in Figs. 2 and 17, and will open the circuit of motor 2| by opening contacts 38" and pull armature 28 to the left, as shown in Fig. 17, to secure certain results hereinafter described. When button I9 is held down as just described, current will flow from the rectifier 25'. Tracing the circuit, current will iiow from contact 20, through wire |4I, as indicated by arrows I4I', wire |40, switch blade |39, wire |54', resistance |0I, wire |44, winding of magnet 21, wire |55, wire |46 back to rectifier and from the opposite side of the rectifier 25' to ground and through ground to switch blade |39', wire |56, post |30, wire |29, wire |28, wire |21, winding 26, wire |26, contact spring 86, contact 88, wire |25 back to button I9.

If the station to which the device has been tuned is desired the button is completely released. However, if a different station is desired the button I9 is released suiiici'ently to break the circuit at contact 20, but not suiilciently to break the contact at |02. 'Ihe button I9 is then pushed down for again closing the circuit at contact 20. This may be done once or as many times as necessary to bring in the desired station, one push being to advance the selector (ratchet wheel 35) one step. If the third station from the first were desired, three pushes on button I9 would be given and after the third push the button would be completely released and then the circuit including the contact |02 would be opened. When the button I9 is depressed the circuits through contact |02 and 20 are both closed so that direct current is supplied to the winding of magnet 21. When button I9 is raised slightly the circuit through contact 20 is opened but current will continue to pass to magnet 21 through contact |02 and the respective resistances |04 and |05 which will supply a weak current to magnet 21 but suiiciently strong to hold armature 28 moved to the left, as shown in Fig. 17. This will maintain contacts |06 and |01 and also contacts |06' and |01 open, while contacts |I1 are maintained closed. This will prevent rotation of the motor 2 I When the button is completely released, the circuits through contacts 20 and |02 are both opened. This deenergizes the magnet 21 and releases the armature 28 whereupon contacts |06 and |01 and also contacts |06' and |01 will close and contacts II1' will open. If, for instance, the cam I1 shown in Fig. 7 was contacting with spring arm 14, current would flow from rectier 25' through wire |41, wire |46, wire |55, winding of magnet 21, contacts |06 and |01, Winding of mag- ,f net I I3, and winding of magnet of |08, to contact I I0, through brush 91, brush 14, cam I1, to ground and through the ground back to rectifier 25. Current owing in this circuit opens contacts |06 and |01' and closes |06' and ||5' While magnet I I3 holds armature I I4 against movement by armature 28. As magnet 21 is energized armature 29 is pulled for rocking bar 30 for swinging pinion 46 into mesh with bevel gear 41.

Substantially simultaneously with the flow of current in the circuit just described alternating current will ow through the motor 2|. This alternating current flows from the alternating current transformer through wire |50, spring 4 I, contacts 39" (spring 4| having been released by bar 92 having moved), spring 39, wire |5I, spring 94, contacts |06 and ||5', spring arm ||5, wire |52, Wire |53, winding |35 of motor 2|, wire |34, back to the transformer. This will cause the motor to rotate and in turn rotate pinion 46, gear wheel 41, and shaft 49 for actuating the friction pulley 58 for rotating the disk 59 (Figs. 2 and 12), which is coupled to the condenser 3, as shown in Figs. 2 and 17. As soon as motor 2| starts to rotate shaft 22 will move to the left, as shown in Fig. l, until the end of arm 96 slips oiT the shaft, whereupon the resilient action of arm 96 will close contacts 96'. The motor will continue to operate until the cam |1 (Fig. 7) moves o brush 14, whereupon the circuit of the direct current to magnets 21, |08 and I|3 will be opened. When the circuit of magnet |08 is opened the spring arm 94 will move for opening contacts |06 and ||5 and close contacts |06 and |01'. This will deprive magnet 21 of current and, consequently, the armature 29 will move away from the same and swing pinion 46 away from gear 41 and into mesh with gear Wheel 48. When arm 96 slips ofi the shaft 22, contacts 96' are closed and as the armature 29 has already allowed the arm 33 and associated parts to move to the right, as shown in Figs. 2 and 17, the spring arm 40 is released and moves also to the right, as shown in Fig. 17, for closing contact 93 whereupon direct current will be supplied to the magnet 21. This will cause the armature 29 to be attracted for swinging arm 33 to open contacts 93'. This will deprive magnet 21 of current and armature 29, arm 33, panel 34 and associated parts will swing to the right (Fig. 17). This will again close the contacts 93. This action is continued until the ratchet wheel 35 has reached a normal position, which is the position shown in Fig. 17 or a position 180 therefrom. While the step-by-step lmotion of the ratchet 35 and associated parts is taking place, a Weak current flows through magnet 21 for attracting armature 28 for holding the contacts |06' and |01' open in order to prevent the rotation of motor 2| at this time. At the same time contacts |06 and |01 are maintained open to prevent energizing magnet I I3.

When button I6 is depressed current will how in a certain path including motor 2|. Starting with button IIS, current will pass through contact I I9, resistance |05, wire |4I, wire |40, switch blade |39, wire |54', resistance IUI, wire |44, winding of magnet 21, wire |55, Wire |46, wire |41 to rectifier 25', to the ground and through the ground to switch blade |39', wire |56, wire |29, wire |28, contact 90, contact 88 and wire |25, back to contact ||9. Current owing in this circuit will maintain magnet 21 energized so that it will continue to attract armature 28 but armature 29 will not be attracted by reason of the tension of the spring 40 associated with block 31.

When button |03 is depressed current will now through a circuit including the winding of magnet 21. Starting with Contact |02, current will ow through the resistances |04 and |05, Wire I4I, wire |40, switch blade |39, wire |54', resistance wire |44, winding of magnet 21, wire |55, wire |46, wire |41, rectifier 25 to the ground, and through the ground to switch blade |39', wire |56, post |30, wire |29, wire |28, contact 90, contact 88 and Wire |25, back to button |03 and contact |02. Button |03 and button I i6 are used to actuate the volume control. From the above traced circuit it will be seen that when button |03 is depressed there will be an increase in volume. It will be noted that when the button |03 is depressed both the resistances |04 and |05 are in circuit and the armature 28 is attracted only suiicient to close contacts ||8'. However, when button ||6 is depressed resistance only is included and the armature 28 is attracted to the fully operated position and contact ||1' is closed. The contacts |I1' and IIB control the direction of rotation of the motor and, consequently, of the volume control. It will also be observed that the receiver is switched oif by rotating the volume control in the decreased direction until the switch arm 23 snaps the switch 24 to the oif position.

Starting with button ||S the circuit for energizing the magnet 27 to cause it to attract armature 28 and cause contacts ||7' to be closed, is through wire |25, contact springs 85 and 90, wire |27', wire |28, wire |29, wire |56, switch blade |30', ground, direct current rectifier 25', wire |47, wire |40, wire |55, winding of magnet 27, wire |44, resistance Il, wire |54', switch blade |39,

wire |40, wire |4|, resistance |05, wire ||9 and back to button H6. The circuit through contacts H7 is spring H7, spring 38, contact 38",

spring 4|, wire |50, secondary of alternating current transformer, wire |34, winding |35' of motor 2|, wire |53, spring l I8, and back to contacts ||7'. These circuits rotate the motor for decreasing the volume.

In this specification it will be understood that when the term gear or gear wheel is used it includes toothed gears (beveled or spur) and also friction gears.

I claim:

l. In a remote control for radio receiving sets having an alternating current rectifier, a motor, a hand actuated switch for turning on alternating current to said motor, means actuated by said motor for simultaneously opening the circuit of the alternating current to the motor and hand actuated switch and thereby stopping the motor, said means also turning alternating current on said rectifier and at the same time connecting said hand actuated switch with the direct current circuit of the remote control for controlling the operation of the remote control.

2. In a remote control for radio receiving sets having a tuning condenser, means for moving the condenser for tuning including a rotatable shaft coupled to said condenser and electrically actuated means for rotating said shaft, a plurality of aligned cams freely rotatable on said shaft, a plurality of friction spiders secured to Said shaft, the spiders being arranged so that one spider will be positioned between and act on each two cams and cause the cams to normally rotate with the spiders, a projecting member carried by each of said cams, a pivotally mounted locking arm for each of said cams, each of said locking arms having a notch for receiving a projection from a cam when the respective arms are moved into functioning position, a finger projecting from one end of each of said arms, a movable selector having a notch for each of said fingers, and means for swinging said arms so as to cause the respective projecting members on the cams to enter the respective notches in Said arms and the ngers to enter the notches in said selector, said notches in the selector being positioned so that only one linger at a time can enter a notch in the selector, whereby when any arm is interlocked with a projection from a cam it is held in a locked position.

3. In a remote control for a radio receiving set, a dynamic speaker having a voice coil and a eld coil, an armature positioned to be attracted by the magnetism from said iield coil, a hand actuated switch for momentarily closing a circuit including a` source of direct current and said field coil, means. actuated by Said armature for closing and maintaining closed a circuit including a source of direct current and said field coil, said armature also closing and maintaining closed a circuit including said voice coil and the output of said receiving set.

4. In a remote radiocontrol containing a first and a second switch, a motor and a tuning means, a magnetic gear shift structure consisting of a gear, a transmission shaft actuated by said motor and a pinion actuated by said transmission shaft and disposed adjacent said gear, a pivotal arm to move said pinion laterally so as to cause the pinion to mesh with said gear and thereby couple said motor and tuning means, and a pawl secured to said arm and disposed to engage the teeth of a ratchet wheel associated with the rotor of thesecond switch so as to cause step-by-step rotation of said second switch rotor on movement of said gear shift structure.

5. In a remote control containing a first and a second switch, a motor, tuning means and a volume control, a magnetic gear shiftY structure consisting of a pair of parallel gears, a transmission shaft actuated by said motor` and a pinion actuated by said transmission shaft and disposed between said parallel gears, a pivotal arm positioned to move said pinion laterally so as to cause the pinion to engage one of the gears for coupling the motor` and volume control and to engage the; other gear for coupling the motor and tuning means, and a pawl secured to said arm and disposed to engage the teeth of a ratchet wheel associated with the rotor of the second switch so as to causey a step-by-step rotation of said second switch rotor on the movement of said gear shift structure.

6. In a remote control for a radio receiving set, a plurality of cams, each cam having part of its surface acting as a contact member, a circuit for each station to be selected and for each of said cams, a step-by-step switch for closing any of said circuits, means including a magnet for actuating said step-by-step switch, said switch having an individualcontact for each of said circuits and a common contact for all of said circuits, each of said individual contacts including a spring arm positioned to engage the contact member or a cam when the contact member thereof is in position to close one of said circuits, means including a motor for actuating said cams, a circuit for said motor normally held open by said magnet whereby when said magnet stops functioning said motor circuit will close until said cams reach the setting for the selected station, a switch for connecting any of said individual contacts with said common contact, and means for actuating. said switch.

7. In a remote control having a step-by-step switch for selective tuning, a tuning element, a motor, mechanical means having the dual purpose of coupling said motor and said tuning means and rotating the rotor of said step-bystep switch, an electromagnet having two armaures, one of which actuates said mechanical means, and a plurality of engaging contact springs for closing and shifting circuits of said motor to cause direct and reverse operations of the same in either direction.

8. In a remote control having a step-by-step switch for selective tuning, a tuning element, a volume control and a motor, an electromagnet having two armatures, one of which actuates a mechanical means having the triple purpose of coupling said motor and said tuning element, coupling said motor and said volume control, and rotating the rotor 0f said step-by-step switch, and the other `engaging contact springs for closing and shifting circuits of said motor to cause direct and reverse operation of the same in either position of the r'st.

9. In a remote control having a tuning means, a step-by-step switch or selectively adjusting said tuning means, a volume control and a motor; an electromagnet having two armatures, one or" which actuates a mechanism for rotating the rotor of said step-by-step switch to tune to a station, the other closing and shifting contacts for causing direct and reverse operation of said motor when coupled to said volume control for adjusting the volume; a winding and a circuit for said winding, a circuit closer for closing said circuit directly to cause said magnet to actuate the first-mentioned armature, a resistance, a second circuit closer for closing said circuit through said resistance to cause said magnet to actuate the second mentioned armature without moving the first-mentioned armature, a second resistance, and a third circuit closer for closing said circuit through said second resistance to cause said magnet to partially actuate the second mentioned armature without moving the rst.

DONALD C. PIERCE.