US2100659A - Radio apparatus - Google Patents

Description

Nov. 30, 1937. A GOULD 2,100,659

RADIO APPARATUS Filed.April 23, 1925 2 Sheets-Sheet l awvcutoz Guam 121 5 L. A GOULD RADIO APPARATUS Nov. 30, 1937.

Filed A rii 25, 1925 2 Sheets-Sheet 2 Patented Nov. 30, 1937 UNITED STATES PATENT OFFICE RADIO APPARATUS Application April 23, 1925, Serial No. 25,253

8 Claims.

This invention relates to radio receiving mechanism, and particularly to a control device therefor, and has for an object to provide a control for the tuning device or devices of a receivin set which will greatly simplify the operation of tuning the set for different stations.

It is also an object of the invention to provide a control for the tuning device or devices in which the dials for the condensers or variometers are eliminated, and in which the tuning devices may be adjusted from a distance and through the medium of a single control device connected with the set by a flexible connection.

It is a further object of the invention to provide a means for adjusting the device or devices to perform the tuning operations which will not cause the set to squeal or howl as it very often does when the dials are twirled or operated too rapidly in the operation of tuning, and it will thus prevent the set from sending out radio frequency oscillations to interfere with neighboring sets.

With the foregoing and other objects in view, I have devised a control mechanism one embodiment of which is illustrated in the accompanying drawings forming apart of this specification, similar reference characters being employed throughout the various figures to indicate corresponding elements. In these drawings,

Fig.'1 is a diagrammatic view of a radio receiving set indicating in outline how my improved control and adjusting device may be applied thereto.

Fig. 2 is a front view of the cabinet which may be used to house a set controlled by my improved mechanism.

Fig. 3 is a detail of a portion of one form of an indicating device.

Fig. 4 is a top plan view of the cabinet for a receiving set showing one form of my improved controlling mechanism mounted therein, the tubes, coils and other devices of the set being omitted.

Fig. 5 is a front elevation of the arrangement shown in Fig. 4.

Fig. 6 is a longitudinal section through one form of a remote control device.

Fig. 7 is a longitudinal section substantially on line |'l of Fig. 6.

Fig, 8 is a, longitudinal section of the control device substantially on line 88 of Fig. 6 and indicating diagrammatically a control for the first radio frequency tube, and

Fig. 9 is a transverse section through the remote control substantially on line 9-9 of Fig. 6,

Referring to Fig. l, I have shown in this figure a wiring diagram for merely one type of radio receiving set, it being understood that this particular layout is shown merely for the purpose of illustrating my invention, and that my lnven 5 tion may be applied to all types of receiving sets. In this set a pair of audio frequency transformer coils are shown at TI and T2, and at RI, R2 and R3 are shown radio frequency transformers with variable condensers Cl, C2 and C3 connected 10 across the secondaries of these transformers, and the sockets for the various tubes are shown at Ml, M2, M3, M4 and M5. In the embodiment illustrated there is connected to the shafts SI S2 and S3 carrying the movable plates of these con- 15 densers worm gears l0 meshing with worms ll mounted on shaft sections l2 connected to a. worm gear [3 which meshes with a worm M on the shaft I5 of an electric motor IS. The shaft sections I2 may be a single continuous shaft but 20 I prefer to provide a short section for each tuning device and then connect the sections together by detachable couplings l1, these couplings in the present device being short collars clamped to the adjacent ends of the shaft sections by set screws 25 I8. By this arrangement the tuning devices, either variable condensers or variometers, may be mounted in separate boxes or containers IS with the shaft section l3 mounted therein and having driving connection with the movable ele- 30 ment of the tuning device through the worm II and gear I0, so that each tuning device is a separate and distinct unit which may be mounted as a complete assembly or unit in the cabinet, and by merely duplicating these units and con- 35 necting the shaft sections together as many may be used as found desirable or required for the particular layout used. It will be apparent that all of these condensers or variometers will be adjusted by the motor I6. 40

This motor is also mounted within the set cabinet, but it is preferably enclosed in a lead cabinet or box 20 to prevent interference of the motor with the other devices in the cabinet, and the motor should be mounted on a rubber or fibre 45 base 2| to absorb vibration and reduce the noise of operation. The motor shown is a shunt wound motor, the armature leads being shown at 22 and 23. and the field leads at 24 and 25. This motor is controlled by a remote control device, shown 50 more in detail in Figs. 6 to 9, which is adapted to be held in the hand of the operator and at any convenient distance from the cabinet desired. This control device is connected with the mo r and any other device with which it is to 66 be operated by flexible leads in a cord 26. In the layout illustrated this control comprises an insulating block 21 made in two sections, the upper one of which carries four stationary contacts 28 cross connected as indicated in Fig. 4, and mounted to slide between these contacts is a pair of slidable contacts 29 connected to a button 30 exposed on the outside of the control device, so that these contacts may he slid back and forth to engage either the outer or inner pair of contacts 2B and control the operation of the motor,

. to which they are connected by the lead wires 3 l through the battery 32 as indicated. In other words, this switch provides a reversing switch which will operate the motor in either direction depending upon which pair of contacts 28. the.

slidable contacts 29 engage. Of course, other forms of switches may be used to carry out this function.

Mounted in the field circuit of the motor is a magnet coil 3.3 adjacent the pivoted armature 34 carrying a brake pad 35 adapted to engage the rim of a brake disc 36 mounted on the motor shaft J5, and a spring 3? tends to press this brake pad against the disc. Thus when the circuit through the motor is closed the magnet 33 is energizedand will move the pad away from the brake disc and allow the motor shaft to turn freely, and immediately the circuit through the motor is broken, the spring 31 will press the pad against the disc and quickly stop the motor. Thus when the desiredadjustment is secured and the circuit broken the momentum of the motor will not spoil the adjustment. A condenser 59 is connected across the field coils of the motor to prevent it sending out radio frequency oscillations should the commutator and brushes get to sparking in operation.

Also mounted on the control device 27 is a .control'for the filament of the first radio frequency tube 38, so that there is also provided a remote control for controlling the volume of the sound produced. In the present embodiment there is mounted on the under side of the lower sectionof the block 27 a pair of spaced resistance wires 39 connected by leads 40 in the cord 26 to the filament 4! of the first radio frequency tube and alsothe A-battery-42. These resistance wires are bridged by a slidable contact 43 which may be adjusted longitudinally of these wires by means of a button 44 projecting through a slot in the cover plate 45 where it is accessible for operation on the other side of the control block from the control button 30 for the motor. Thus it will be apparent that on the control device 2'! which may be held in the hand of the operator at any desired distance from the set or receiving mechanism is acontrol for the motor which operates the tuning device or devices, and also a control device for varying the volume of the sound produced. 7

It is desired that there be some indicator to indicatetowhat stations the. set is tuned. This indicator may assume various forms but in the present construction the front wall 46 of the cabinet is provided with an elongated opening 4? closed by a translucent member 48, such as ground glass, mounted in a suitable frame 49 secured over this opening as by screws 50. Connected to one of the movable shafts SI, S2, or '83, in the present case the central shaft S2, is a movable device for projecting a beam of light on the rea-rof this translucent window so that it is visible from the front of the cabinet. In the present case a small box or container is mounted on a shaft 52 of a gear 53, which gear meshes with a pinion 5% on the shaft S2. The box 5| is adjustable up and down on the shaft 52 so that it may be adapted to cabinets of different heights. Mounted in the box 5| is an electric light bulb 55 connected to any suitable source of power, such as the A-battery by a lead 56, the other terminal of the lamp being grounded. In the front end of the wall of the box 55 is a vertical slot so that a narrow beam of light will be thrown from the light on the window d8 as indicated at 58, in Fig. 2. Because the shaft S2 is adapted to be adjusted more than a half revolution the pinion 54 is made smaller than the gear 53 so that turning movement of the box 5! is not as great as the shaft S2 although it is proportionate'thereto. Therefore, the shaft S2 may be turned to give maximum adjustment without throwing the beam of light off the window 48. The designation for the different stations may be marked on the glasswindow if desired, as indicated in Fig. 2. Instead of swinging the lamp it will be obvious a mirror may be mounted to swing and arranged to project a beam of light on the window. r. 7

It is believed the operation will be obvious from the foregoing description. As the control device 27 may be held in the hand and is connected to the cabinet by a flexible cord 26 the operator may be stationed at any point desired and at any distance depending upon the length of the cord used.

' By merely operating the switch button 30 he may run themotor Hi either forwardly or backwardly as desired to adjust the tuning devices Cl, C2, and C3 in either direction to tune in with any station desired. Because of the large reduction in the driving ratio between the motor and the shafts SI, S2 andSS through the medium of the worm gear drives the adjustment of these shafts may be made very slow so that there'is no squeal ing or howling of the set. As the shafts are adjusted the box 5| will be shifted a corresponding amount to swing the beam of light along the window 48 and the'operator, if stationed at the front of the cabinet, may watch the movement of this beam of light and determine thereby with what broadcasting station the set is tuned. Im mediately the set is tuned in with any station desired and the station comes in with the desired clearness the motor circuit may be broken by means of the button 39 and the motor will be immediately stopped by the brake mechanism as above described, and thus the adjustments may be stopped immediately at any point desired. As pointed out above there is also a remote control of the volume of sound through the button 44 on'the other side of the control block 21. If desired, the top wall of the cabinet may be made of insulating material such as bakelite and the binding posts for various electrical connections mounted thereon.

It will thus be apparent that I have provided a simple and' easily operated remote control for tuning the set to any station desired and also for take it to a table at which he is sitting, or the 575 control may be given to an invalid in bed so that the set may be tuned to any station desired and controlled without the operator leaving any of these positions.

Having thus set forth the nature of my invention, what I claim is:

1. The combination with a radio receiving mechanism including a plurality of tuning devices comprising separate independent units having adjustable elements, a rotatable shaft for each device, a driving connection from the shafts to the respective elements, detachable adjustable connections between the shafts, a motor having rotatable driving connection with the shafts, and a remote control means for the motor.

2. The combination With a radio receiving mechanism including a tuning device having a movable element, a panel having an opening covered with a translucent material, a lamp connected with said element to move in certain timing relation therewith and arranged to throw a beam of light on said translucent material, a motor, a driving connection from the motor to the movable element, and means for controlling said motor to adjust the element.

3. The combination with a radio receiving mechanism including a tuning device having a movable element, a panel having a translucent window, means for throwing a beam of light on said window and connected to move in certain timing relation with said element, power means for adjusting said element, and control means for the power means.

4. The combination with a radio receiving mechanism including a tuning device having a movable element, a panel having a translucent window, means for throwing a beam of light on said window and connected to move in certain timing relation with said element, an electric motor, a drivlngconnection from the motor to said element for adjusting the latter, and a remote control for the motor having a flexible connection therewith.

5. In combination with a radio receiving mechanism including a tuning device having a movable element, a panel having a translucent window, means for throwing a beam of light on said window and connected to move in certain timed relation with said element, and means for adjusting said element.

6. The combination with a radio receiving mechanism including a plurality of tuning devices having rotatable adjustable elements, rotatable means for operating said devices, there being a detachable rotatable driving connection from said means to each of the respective elements, a motor for driving said means and means remote from said receiving mechanism for controlling the operation of the motor.

'1. In combination with a radio receiving mechanism including a tuning device having a movable element, a panel having an opening, a translucent member in the rear of said opening, a lamp member, one of said members connected with said element to move in certain timed relation therewith to indicate through said opening the position of said element, a motor, driving connection from the motor to the element, and means for controlling the motor to adjust the element.

8. In combination with a radio receiving mechanism including a tuning device having a movable element, a panel having an opening therein, a translucent indication member in the rear of said opening, a light member for throwing a beam of light on said indicator member, one of said members connected to move in certain timed relation with said element, and means for adjusting said element, said last means including a motor and means remote therefrom and connected thereto by flexible cable for controlling the movement thereof.

LESLIE A. GOULD.

Images