US2270176A - Radio receiving apparatus - Google Patents

Description

Jan. 13, 1942. VAN LAMMEREN ETAL 2,270,176

' RADIO RECEIVING APPARATUS Filed Sept. 2 6, 1939 s Sheets-Sheet 1 Fi .v

L 3/ 3&5: 34 a; 36 2732 as INVENTORS JOIMNNFSA. VAN IIMMFRE/l, .llFX VJIVDIM,

u c ATTORNEQY Jan. 13, 1942. J. A. VAN LAMMEREN ETAL RADIO RECEIVING APPARATUS Filed Sept. 26, 1939 3 Sheets-Sheet 2 3 Sheets-Sheet 3 m W 1 W/A Jam/mm M/YMMMI/V, an mum, BY u/u/zzmuu/ J. A. VAN LAMMEREN ETAL RADIO RECEIVING APPARATUS Filed Sept. 26,- 1939 Jan. 13, 1942.

J$l 8%86 9 19; T97 96 receiver proper.

Patented Jan. 13, 1942 RADIO RECEIVING APPARATUS Johannes Antonius van Lammeren, Alexis van Dam, Wilhelmus Lambertus Leonardus Vivie,

and .Gunnar-Borge Kniis, Eindhoven, Netherlands, assignors, by mesne assignments, to Radio Corporation of America, New York, N. Y., a corporation of Delaware Application September 26, 1939, Serial No. 296,57

In Germany September 26, 1938 4 Claims. 01. 172-239) The present invention relates to a remote control arrangement for radio receiving apparatus provided with push button tuning.

It is an object of the present invention to provide an arrangement for tuning a radio receiving set from a remote point by controlling from the remote point the push buttons or keys in the According to the invention this object is achieved by providing the receiver proper with a number of keys each of which corresponds to one of the predetermined stations and which can be pressed either each through the intermediary of an element mounted on a shaft, or individually through a number of elements which are provided on a shaft and radially displaced relatively to one another; this shaft is driven from a motor which is put into service simultaneously witha. selective device upon operating the station selector, said selective device causing only the key to be pressed which corresponds to the desired station.

In one form of construction of the invention the keys provided in the receiver proper are arranged in a row and parallel with this row is provided a shaft to which-are secured a number of cams by means of which .upon one revolution of the shaft the keys are pressed successively.

In another form of construction of the invention the keys provided in the receiver proper are arranged about a shaft carrying a cam by which the keys are pressed successively upon one revolution of the shaft.

The selective device preferably consists of a row of contacts each of which corresponds to one of the keys provided in the receiver proper and along which travels a contact arm which is driven from the motor and runs. in synchronism with the said shaft; upon operation of the station se-, lector one of the contacts receives a potential different from that of the other contacts, the

. said shaft being stopped as soon as the contact reaches the contact in question.

In this case the motor may, for instance, be connected as an electric brake, as soon as the contact arm reaches a contact having a potential different from that of the other. contacts. In a third form of construction of the invention each key provided in the receiver proper carries a member which can be adjusted by means of a magnet; upon choosing the station corresponding to the key in question this magnet is energized and shifts the member so that the key is pressed through the intermediary of the element and of the member.

The invention will be more clearly understood by reference to the accompanying drawings .representing, by way of example, some forms of construction thereof.

Figures 1 and. 2 are wiring diagrams of one form of construction according to the invention.

Fig. 3 shows schematically the mechanical part of this form of construction.

Fig. 4 is a detail view of a circuit arrangement for tuning by means of push buttons.

Fig. 5 shows a secondform of construction of the invention, whereas Figs. 6 and 7 represent a third form of construction.

Fig. 1 shows a keyboard 4| for remote control which comprises a number of press buttons 31", 308-4, etc, arranged to operate switches l, 2-5, etc. by means of which a number of station selecting keys 3|v to 40 provided in a receiver.

proper of the push button type can be operated through the operation of a motor 42. In the form of construction in question the motor 42 is also adapted to operate the tuning means.

For operating the keys a cam shaft is provided which is denoted by 43 and the number of cams 2| to 30 provided thereon corresponds to that of the keys 3! to 40. These cams are radially shifted with respect to each other so that upon rotation of the shaft 43 the keys 3| to 40 are successively depressed by the cams 2| to 30. The cams are so spaced that there is never more than one key depressed at any one time. Thus the position of the shaft 43 determines which key is depressed and to what station the receiving set is tuned, the adjustment of the shaft 43 to the position corresponding to the desired station is effected by means of the motor 42. The latter must be capable of actuating the shaft 43 and must consequently be put into service on depressing a press button and, after the key corresponding to the desired station has been depressed through the intermediary of the cam shaft 43, it must be disengaged from the shaft 43 or thrown out. Since in the form of construction described above, as has already been stated, the motor 42 also drives the tuning means, a mechanical coupling must be provided at least between the cam shaft 43 and the motor 42, which coupling can be engaged and disengaged. Moreover, it is desirable that the mechanical coupling between the motor and the tuning means may be engaged and disengaged.

Upon pressing one of the press buttons three operations must consequently be effected, viz.:

The mechanical coupling between the motor 42 and the tuning means must be interrupted;

A mechanical coupling must be established between the motor 42 and the cam shaft 43; and,

The motor 42 must be put into service.

For carrying out these operations a relay 44 is provided which effects the required electric operations as well as the required mechanical operations. Relay 44 is arranged so as to operate the change-over contacts 45 and 45, and also to shift the toothed wheel on the shaft 3|9 of the motor 42 against the action of a spring 8|8.

The toothed wheel 58 meshes with the toothed wheel 5| mounted on the cam shaft 43 if the relay 44 is energized, however if the relay 44 is not energized, toothed wheel 59 meshes with wheel 52 which is mounted on shaft 32| oi the variable condensers 53, 54 and 55.

The cam shaft 43 has mounted on it a contact arm 41 which is arranged to travel over a number of contacts II to 29.

The ten contacts I to 29 are connected through ten conductors (only three are shown in Figure 1 so as to simplify the description) to the press button operated switches 2-5 etc., associated with the keyboard 4|. The press buttons (see 381, 388, and 3| I) are furnished with a latching mechanism 303, 3|5 which holds any depressed push button in the depressed position and upon depressing a push button releases any previously depressed push button.

The latching device operates a contact 48 so that upon depression of one of the press buttons contact 48 is closed momentarily due to displacement of lock bar 303 to the left.

If one of the press buttons, for instance, the press button 3 corresponding to switch 5 is depressed, the contact 48 is closed momentarily by the latching device 393, due to which a closed circuit ensues through a source of potential'connected between the terminals 58 and 51, an incandescent lamp 49, the relay 44, the latching contact 48, and back again to the terminal 51, thus causing the relay .44 to become energized thereby attracting its armature 3". In this way contact 48 is closed and since contact 46 is connected in parallel with the latch contact 48 relay 44 remains energized despite the opening of switch 48. As has already been stated attraction of the armature of the relay also shifts gear 58 out of engagement with gear 52 and into engagement with gear 5| thereby disengaging the motor 42 from the variable condensers 53, 54 and 55, and coupling the motor to the cam shaft 43. Also, the motor 42 is put into circuit by changing over the change-over contact 45 from the position shown to its other position, the motor being fed from the alternating current mains connected between the terminals 58 and 59. The motor 42 thus begins to operate in a predetermined direction and actuates the cam shaft 43 through the intermediary of the toothed wheels 50 and 5|, the keys 3| to 49 being successively depressed by the cams 2| to 30, whereas the contact arm 41 travels over the contacts II to 29.

On reaching the contact l5, which is connected to the closed switch 5 the relay 44 is short-circuited through the switch5, the contact I5 and the contact arm 41. The lamp 49 constituting a series-resistance then lights.

The relay 44 is cut out and changes over the -motor 42 upon the change-over contact 45 resuming its left hand position which is its position of rest- Furthermore, the mechanical coupling rupted and the mechanical coupling between the motor 42 and the variable condensers is reestablished.

The key corresponding to the press button 5 has been depressed by the corresponding cam 25 in the reached position of rest of the cam shaft 43. This depressed key 35 initiates the tuning operation.

Depression of key 35 acts through the mechanism shown in Fig. 4 and described in more detail hereinafter, to cause the motor 42 to operate and bring the variable condense-rs into the desired position, the position of the selected change-over contact 50 shown in Fig. l determines the direction in which the tuning means is driven by the motor.

It should be understood that while only one of the devices 50, 8| and 62 has been shown, there are, in fact, ten such devices in the embodiment illustrated; that is, one for each of the ten push buttons 3| through 40.

Fig. 2 represents a simplified construction of the circuit arrangement shown in Fig. 1, corresponding parts of the circuit bearing the same reference numbers. The differencebetween the circuit arrangements shown in Figs. 1 and 2 consists in that in Fig. 1 the depression of one button brings about the closure of a switch, whereas in Fig. 2 the depression of one of the buttons between the motor 42 and cam shaft 43 is interopens a switch.

In this manner the construction shown in Fig. 1 is simplified in that the latch contact 48, as well as the contact 46 which is operated by the relay 44 and acts in parallel with the latch contact 48, can be dispensed with. Since, moreover, the relay 44 is not short-circuited, as is the case in Fig. 1, but is put out of circuit, the incandescent lamp 49 may be omitted, thus obtaining a saving in energy.

The contact row H to 20 shown in Fig. 2 differs from the row bearing the same reference numbers and shown in Fig. 1 only in that the contacts H to 20 in Fig. 2 have a very small intermediate space such that the contact arm on passing from one'tothe other contact is connected to both contacts.

All of the contacts II to 29 are connected respectively through the switches to It! operated by the press buttons and through the relay 44 to the terminal 51. The contact arm 41 connects with the terminal 58. Between these terminals 55 and 51 is connected the supply for the relay 44. Consequently, the relay 44 is de-energized only if the contact arm 41 reaches a contact which is connected to an open switch. If, for instance, the press button 5 is depressed the switch 5 is opened and the contact |5 insulated. On operating the press button 5 the press button already depressed at this moment is released, the switch corresponding to this press button is closed and the contact of the row II to 29 corresponding to this switch is connected to the relay 44. In this manner a closed circuit ensues from the terminal 55, through the contact arm 41, the last mentioned contact and corresponding switch through the relay 44 back to the terminal 51. The relay 44 is energized and performs the same functions as described already by reference to Fig. l. The contact arm 41 moves until the con tact I5 is reached. The current traversing the relay 44 is then interrupted owing to which the contact arm 41 comes to a standstill, whereas the relay 44 now de-energized effects the further required commutations.

Fig. 4 illustrates how the variable condensers can be brought into a predetermined position. The condenser shaft has adjustably mounted on it a disc I I2, provided with two peripheral edges having a diflerent radius which edges each extend, for instance, through 180 and are separated from each other by a cavity 3, viz. the

' peripheraledge III having a larger radius and the peripheral edge I33 having a smaller radius. A spring 233 clamped at a point 232 carries a Ieeler II3 whose bottom side bears on' one of the peripheral edges III or I33 if the spring 233 is depressed. The cam 25 acts on a lever 35 which is pivoted at 233, it being remarked that a plate spring 243 provided between the lever 35 and the spring 233 exerts a downwardly directed pressure on the spring 233 if the lever 35 is depressed by the cam 25.

Furthermore two contact springs I43 and I45 are provided which are furnished with contacts 3| and 62 and, as shown in Figs. 1 and 2, are connected to two points of the motor winding;

Between the contacts 6I and 62 there is provided a contact 63 which alternatively bears on the contacts 6I and 62 and is supported in an insulated manner by aprojecting part I44 provided on the spring 233. 1

Another projecting part I43 provided on the spring 233 is located between two contact springs I41 and I42 and, in the position of rest illustrated, it spaces from each other the contacts 236 and 231 provided on the contact springs HI and I42. Even in the lowest position of the pro- Jecting part I43 the switch 236, 231 constituted by these contacts is open. The stator of the tuning motor is equipped with two windings which are wound in opposition and'are spatially displaced with respect to one another. The mains voltage is connected between the junction of these windings and contact spring I, whereas contact spring I42 is connected to a contact 63. The two remaining ends of the motor windings are connected to the contact springs I43 and I45 and interconnected through a condenser. As a result 01 this the motor, if the switch 236, 231 is closed and the contacts 63 and 6| touch each other, will operate in one direction, whereas if the contacts 63 and'62 touch each other it will operate in the other direction.

If in the illustrated position the lever is depressed by the cam 25 the spring 243 acts on the spring 233 so that the latter sags until the feeler II3 bears on the peripheral edge I33 of smaller radius below this feeler. When the projecting part I43 descends the switch 233, 231 is closed and at the sametime a connection is established between the contact 63 the contact spring I42 connected thereto ..and the contact 32. In this case the motor is fed and operates in such a direction that the cavity II3 moves towards the feeler I I3. At the moment at which they reach each other the Ieeler II3 snaps into the cavity I I3 due to which the switch 233, 231 is opened and the disc is mechanically stopped.

If thelever 35 were depressed at the moment at which the feele'r I I3 is opposite the peripheral edge III of larger radius the teeler II3 might be depressed only over a smaller distance than in the first mentioned case. The switch 233, 231 'is now closed, it is true, but the connection between the contacts 33 and 3| is not interruptedso thit"in"this-case the motor operates in the other direction until the feeler II3 snaps into leaves again the cavity H3.

the cavity I I3 and the motor is thrown out in the manner set out above.

A device (not represented) makes that it another lever is depressed, the lever 35, which remains in the depressed position due to the depression, is released so that the feeler H3 also Fig. 5 shows another form or construction of the invention, In this form or construction the tuning means consist of a number of slide condensers one of which is represented in the drawing and designated by I63. The capacity variation is effected by displacement of the rod I6I in a' longitudinal direction against the force of a suitable returning spring (not shown) by pushing against a plate I62 secured to the rod The pressure on the plate I62 may occur either by means of a number of adjustable pins I63, I64 of diiIerent length or by means of a rod 65 which by turning a knob 66 can be moved upwards and downwards in a nut 61/ by means of a screw thread which may have a variable pitch.

When tuning by means of a motor the knob 63 is drawn out as a result of which the nut 61 closes the contact 63 and is kept in place by the spring 63. In this case the rod 65 stands free from th plate I62, whereupon the condenser can be adjusted with a motor 13 by means of the pins I63, I64. The motor 13 is mechanically coupled by means of a toothed wheel H to a toothed wheel 12 provided'with a cam, which turns above the heads 01 the pins I63, I64, and moreover with a toothed wheel 14 or the same size which is secured with the contact arm 15 to a shaft, the heads of the pins I63, I34 playing the same part as the keys M to 43 in Fig. 3. This contact arm 15 passes in synchronism with the -cam 13 over a number ofcontacts 16, 11, 13, 13

which correspond to a number of press buttons 86, 31,33, 33 on a keyboard 33. Below the press buttons, which are released by the action of springs (not represented) are provided two metal strips 3I to 32 which are connected to the terminal 33 of the alternating current mains or to a point of the motor winding. Upon depression of one of the buttons 36, 31, 3 3, 33-the strips H and 32 are connected to the contact below the depressed button. The terminal 34 of the network is connected through the contact 33 to another point of the motor winding. Below the press buttons there is a number or individual contacts 36, 31, 33, 33 are provided which are connected v to the contacts 16, '11, 13, 13. v n

The condenser 35 in the motor 13 can be short circuited through these contacts, the contact arm 15 and the strip 32, due to which the motor begins to operate as'an' electric brake, since the initial rotary field changes to an alternating field. It, for instance, the press button 31 is pressed the motor 13 begins tooperate and the rotor of the motor is drawn into the field of the stator, the contact; arm 15 now passing over the contacts'. Upon reaching contact 11 the condenser 35 is'short circuited owing to which the'motor stops in this position. In this case the cam 13 hasdepressed one or the pins I63 and I34 thus securing a definite final position for the slide condenser. toothed rack 33 which is engaged by a pawl II by the action of a spring 32. This pawl prevents the condenser from returning with each succeeding depressed pin, so that the condenser comes to a standstill in the position determined The rod I6I has mounted ,on it a e by the longest pin passed by the cam 13. Only when the final position of the cam I3 has been attained and the motor I is thrown out by releasing the press button the condenser I60 is released, since the pawl 9| is lifted from the toothed rack 90 by a lever 93 and a spring 94, if the rotor of the motor is no longer attracted in the field of the stator. After the desired station has been reached the motor comes to a stand still which may be indicated by an incandescent lamp which may be switched in by means of a centrifugal contact provided on the motor shaft. The press button is then released and the motor is thrown out.

Figs. 6 and 7 represent a third embodiment of the invention.

Fig. 6 is a schematical detail view of the mechanism in the receiver proper, whereas Fig. 7 shows the circuit arrangement of this form, of construction.

In this form of construction the receiver proper, as well as the previous forms of construction, comprises a number of keys, th'e'receiving set upon depression of one of these keys being tuned to the station to which the de- I pressed key in question was previously adjusted. In the form of construction to be described the depression of the keys is effected again by means of a cam shaft provided above the keys, but now through the intermediary of a pawl secured to each key. For each key there is provided a magnet which on bein energized attracts the pawl secured to this key, as the result of which the key can be depressed by a cam provided above the same.

In Fig. 7 a key board comprising a number of press buttons I2I, I22 and I23 is denoted by I; this board is separated from the receiver and placed at a smaller or larger distance therefrom. The receiver comprises a number of magnets I26, I21 and I20 corresponding to the number oi. keys. Moreover, the receiver comprises contacts III, I32, I33.

From each press button a conductor leads to a corresponding magnet which in its turn is connected in series with the corresponding contact; the circuit can be closed through a relay I which is common to all conductors, a tuning motor I36, the alternating current main Interposed between the terminals I31 and I38 and a common return lead to the press buttons.

If, for instance, the press button I 2i is depressed the said circuit is closed through the magnet I26, the contact I3I still closed at the moment of the depression, the relay I40, the tuning motor and the alternating current mains, as result of which the magnet I26 and the relay I40 are energized and the tuning motor I36 begins to operate.

-The function of the relay I40 is to interrupt the mechanical coupling between the tuning motor I36 and the tuning'means and to establish a mechanical coupling between the tunin motor I36 and the cam shaft provided above the keys to be pressed. This cam shaft is designated by I02 In Fig. 6. The cam shaft I02 moves and the cams provided thereon, which are displaced in the direction of rotation with respect to one another and one of which is denoted by I03 in the drawing, depress the pins located below the cams. One of the keys referred to with corresponding pawl, magnet and pin is represented in Fig. 6.

The key consists of the lever 35. The pawl is designated by IOI, the magnet by I26 and the pin by I04. The key is pivoted at 233 and bears with a spring 240 on a clamped spring 233. Upon depression of the lever 35 the desired station is chosen in the manner set out with reference to Fig. 4. The reference numbers of the parts of the circuit arrangement are the same as those of corresponding parts in Figs. 4 and 7.

As soon as the press button I2I in Fig. 7 is depressed the magnet I26 is energized, the cam shaft I02 begins to turn and the pin I04, inter alia, descends. In the meantime the magnet I20 has changed over, against the action of a spring I05, the pawl IOI which is now in the path of the pin I 04. Due to this the pawl MI is depressed by the cam I03 through the intermediary of the pin I04, the lever 35 following this movement and opening the contact I3I connected in series with the magnet I26. Due to this the energization of the magnet I26 ceases and the motor I36 is stopped. However, the pawl I 0| cannot be drawn back by the spring I05, this being prevented by a projecting part of the pin I 04. The motor I36 is mechanically changed over to the tuning means by the relay I40 whose armature is no as to adjust the controlling means to predetermined diii'erent positions, an operable cam device acting upon operation to operate the selectively operable devices in a predetermined sequence, means including said motor for operating the cam device, a control unit including a plurality of auxiliary selectively operable devices corresponding to said first named plurality of selectively operable devices, each thereof acting upon operation to first cause disconnection of the motor from said adjustable controlling means and connection thereof to said cam device and cause the motor to drive the cam device to a position at which the corresponding one of said first named plurality of selectively operable devices is operated by the cam device, means acting on the attainment of said position to cause disconnection of the motor from said cam device and connection thereof to said adjustable controlling means, said motor acting upon its being coupled to said controlling means to adjust the same to the adjustment called for by the operated one of said first named plurality of selectively operable devices.

2. In signaling apparatus including an adjustable controlling element, a motor normally coupled to said controlling element for operating the same and. selectively operable means acting upon selective operation thereof to control the operation of the motor and thereby effect the adjustment of said element to predetermined different positions, an adjustable selector device for operating said selectively operable means in a predetermined sequence, and auxiliary selectively operable motor control means acting upon selective operation thereof to connect said motor to said selector device and control the -operation of the motor to thereby effect. the adjustment of said selector device to predetermined different positions.

3. In signaling apparatus including an adjustable controlling element, a motor normally con- 'nected to said element for operating the same and selectively operable means acting upon selective operation thereof to control the operation of the motor and thereby effect the adjustment of said element' to predetermined different positicns, an adjustable selector device for operating said selectively operable means, said selector device having a different operating position for each of said selectively operable means, a plurality of auxiliary selectively operable means corresponding respectively to the difler'ent positions I of said selector device, each of said last named means acting upon operation thereof to disconnect the motor from the controlling element,

connect the same to said selector device and control the operation of the motor so as to adjust said selector means to the corresponding one of its positions, and means acting upon adjustment 0! the selector device to the selected position for re-est'ablishing the connection between the motor and the controlling element.

4. In signaling apparatus including an adjustable tuning element, a motor normally connected to said tuning element ior operating the same, and a plurality of selectively operable devices auxiliary selectively operable motor control means acting upon selective operation thereof to effect disconnection of the motor from the tuning element and connect the same to said selector device and control the operation oi the motor so as to adjust said selector device to a desired one of itspositions, and means acting upon adjustment of the selector device to the desired position for re-establlshing the connection between the motor and the tuning element whereby said tuning element is adjusted to the desired position.

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