US1721151A

US1721151A - Sound-reproducing machine

Info

Publication number: US1721151A
Application number: US587067A
Authority: US
Inventors: Alfred N Goldsmith
Original assignee: RCA Corp
Current assignee: RCA Corp
Priority date: 1922-09-09
Filing date: 1922-09-09
Publication date: 1929-07-16
Anticipated expiration: 1946-07-16

Description

July 16, 1929. A. N. GOLDSMITH SOUND REPRODUCING MACHINE Filed Sept. 9. 1922 v 5 Sheets-Sheet 1 I In lmmm avwemtoz AIZFRED N. GOLDSMITH July 16, 1929. A. N. GOLDSMITH SOUND REPRODUCING MACHINE Filed Sept. 1922 5 Sheets-Sheet 2 awuwtoz I ALFRED N. GQLDSMITH v his filthy Y 1 MW 1 Jul 16, 1929.

A. N. GOLDSMITH SOUND 'REPRODUQING MACHINE Filed Sept. 9, 1922, 5 Sheets-Sheet 3 gvwcmtoz RED N, GOLDSMITH 0% A I @511 his abtoz'nma z July 16, 1929. A. N. GOLDSMITH SOUND REPRODUCING MACHINE Filed Sept. 1922. 5 Sheets-Sheet 4 Suva/ 01; ALFRED N. GOLDSMITH his Qbtovn 1. 1 g. /Q/ 4 July 16, 1929. A. N. GOLDSMITH SOUND REPRODUCING MACHINE 5 Sheets-Sheet 5 Filed Sept. '9. 1922,

3 awwento'a ALFRED neomsmnn h 2 @311 f5 61410014043 a/lf Patented July 16, 1 929 UNITED STATES PATENT OFFICE.

ALFRED N. GOLDSMITH, OF MOUNT VERNON, NEW YORK, ASSIGNOR TO RA'DIO COR- PORATION OF AMERICA, A CORPORATION OF DELAWARE.

SOUND-REPRODUCING- MAGHIN E.

Application filed September 9, 1922. SeriaI No. 587,067.

This invention relates to sound reproducing machines, and an object of the invention is to provide a machine which will be very convenient in operation and will be capable of 5 affording a wider range of service than sound reproducing machines as formerly constructed. i

To this end an important feature of the invention resides in the provision of a casing in which a horn is installed and a member mounted on the casing for movement relatively thereto and supporting a set of sound reproducing apparatus. The invention contemplates more particularly the provision of radio receiving apparatus connected to the horn of the machine and mounted in the cover, the cover being so mounted on the body portion of the machine casing and the radio receiving apparatus being so constructed and arranged that in the open position of the cover, the controlling elements of the radio receiving apparatus are disposed on the front face of the cpver in convenient position for manipulation by the operator. iv In accordance with another feature of the A invention, a casing is provided comprising a plurality of port-ions connected together for relative movement, and sets of sound, reproducing apparatus are mounted in respective portions of the casing. Preferably and in the illustrated embodiment of the invention, the/sets of-sound reproducing apparatus are provided with controlling elements, which in the normalpositions of theportions of as to be invisible, the controlling elements of the sound reproducing apparatus and the portions of the casing being, however, so constru'cted and arranged as to render the controlling elements visible upon relative movement of the portions of the casing. The controlling elements. of one set of sound reproducing apparatus in the normal positions of the portions of the casing are located close in order to conserve space within the casing,

the casing arecontained within the dasing soto the controlling elements of the other set and the controlling elements of the respective sets are se arated from each other upon relative movement of the portions of the casing,

operator.

A further important feature of the inven-* so as to render them readilyaccessible to the tion of phonographic apparatus and radio the chamber.

receiving apparatus mounted respectively in the body portion and the cover portion. The cover is preferably formed in two parts, one of which provides a top wall for the cover and the other of which is in the form of a member spaced from the top wall to provide a chamber between the wall and said member within which the radio receiving apparatus is mounted, and the controlling ele- A, ments of the radio receiving apparatus are preferably extended through one of the parts of the cover for adjustment from outside of In order to enable the exterior surface of the cover to present a smooth and unbroken appearance and to cause the controlling elements of the radio receiving apparatus to be disposed in a convenient position for actuation by the operator when the cover is opened, one of the parts of the cover is preferably formed as a panel supported within the other part, the radio receiving apparatus being mounted on the panel and comprising controlling elements extended through it for adjustment from the side of the panel which is exposed when the cover is opened, and the panel beinguperforated to receive the vacuum tubes of the radio receiving apparatus in order to enable the tubes also to be rendered accessible from the ex posed side of the panel for inspection and re.- placement. The exposed side of the panel may be, and preferably is, also provided with means'distinct from the controlling elements of the radio receiving apparatus for facilitatin the adjustment of such elements. In accordance with a still further feature" of the invention, a two-branch horn is. proa vided within the casing of the machine and two sets of sound reproducin apparatus are connected respectively to theiranchesof the horn. The machine also preferably oomprises a device forcontrolling the operation of one of said sets of apparatus and means'for. automatically shutting ofi communicationbetween the main body of the horn and one of its branches upon actuation of the device to cause communication of sound to the other branch. In another aspect, the-invention contemplates the provisionof a two-branch horn mounted in a casing and having phonographic apparatus connected with one of its branches and a telephone connected with its other branch, the telephone being in turn connected with radio receivin apparatus mounted in the cover portion of the casing,

The invention also aims to provide a radio receiver which may be employed as an attach- "ment for phonographs, said attachment being constructed so as to enable it to be mounted in the casing of a phonograph without increasing the 'size of the casing or reducing the available size of any of its compartments.

Preferably and as shown, the attachment comprises a panel constructed to fit within the -cover of a phonograph casing and radio receiving apparatus carried by the panel and connected to the horn of the phonograph.

Still other novel and useful features of the invention, including the provision of a door removably mounted on one side of the phonograph casing to enable ready access to. be obtained to the compartment which contains the horn and the parts associated therewith, will appear as the description proceeds and will be pointed out in the appended claims.

In the drawings, in which like reference numerals designate like parts throughout the various views;

Fig. 1 is a front view of the upper part of a machine embodying the invention with the cover of the machine in open position and with a portion of the machine casing broken away so as better to reveal the phonographic apparatus; I I

Fig. 2 is a view in perspective with the plate in the upper part of thecasing removed so as to reveal the horn;

Fig. 3 is a perspective view of the panel supported in the cover and the radio receiving apparatus carried by it.

Fig. 4 is a perspective view taken from the rear of the, machine and with the door on the rear side of the upper compartment of the casing in open position so as to reveal the horn and the parts associated with it; v

Fig. 5 is a view in sectional elevation from front to rear of the machine;

. Fig.3 's a plan view, partly broken away,

of the construction at the juncture of the main body of the horn and its branches;

Fig. 7, is a view of the machine in side ele- 173131 011, partly broken away so as to, show the radio rece vin apparatus, the phonographic apparatus an the several compartmentsof the casing;

showing the switch mecha- Fig. 8 is a view .nism embodied in the radio receiving apparatus; and a Fig. 9 is a diagrammatic representation of the circuitarrangement of the radio receivlng apparatus. i I he illustrated machine'co'mprises a casmg having a main body portion and a cover portlon 4 hingedly mounted at the top of the body portion-2, as indicated at6. The body portion 2 of the casing is of cabinet form and comprises compartments 8 for containing phonographrecords, etc., and a compartment 10 in its end in which is located a horn 12. The horn 12 flares outwardly from its rear end to its forward end, designated by 14, where it is connected with a wooden tube 16 which constitutes an extension of the horn 12 and is flared in continuation of the sides of the horn 12. 1 Y

Preferably and as shown, the horn 12 is formed at its rear end with two

branches

18 and 20, the former extending upwardly and the latterextending first laterally and then forwardly within the compartment 10 of the casing. The branch 18 of the horn is seated i at its upper end in the top wall 22 of the body portion 2 of the casin and is connected above the wall 22 with a tu ular arm 24 of .known construction in sound reproducingapparatus of the phonographic'type. The arm 24 at its forward end carries a sound box 26 which may turn-table 32, is adapted to have a phonographic record placed thereon, andin the operation of the phonographic apparatus the sound box 26, on the arm 24, is thrown forwardly from the position shown in Figs. 2, '5

and 7 in a known manner to cause a needle 35 on the sound box to engage with and ride upon the record. v a

.The sound box 26 constitutes an element by means of which the operation of the pho- -100 nographic apparatus may be controlled, and the phonographic apparatus also preferably comprises other controlling elements (not shown) of the kind usually provided for governing the rotation of the table 32.

The lateral branch 20 of the horn 12 is connected to a second sound reproducing apparatus, which-is of the radio receiving type. As shown, the branch 20 is gradually tapered inwardly to its forward end where it is provided with a telephone 36 connected with the radio receiving apparatus. The cover portion 4 ofthe casing of the machine is preferably confistructed in two parts,-one of such parts bei with n the other part and spaced from the top wall 42 of theother part to rovide a chamber 44 between the parts. he chamber 44 of'the two-part cover is adapted to contain, .radio receiving apparatus, and in order to enable the chamber to be made of suflicient size to contain the radio receiving apparatus and yet avoid mechanical interference with the phonographic sound box 26, even though the space within the cover is small, the panel 40 may be inclined downwardly from the rear end to the forward end of the cover, with relation to its top wall 42, as clearly shown in F i'gs. 5 and 7.

InTthe illustrated construction, the radio a recelving apparatus comprises aprimaryin-Q in the form of a panel 40 supported 3, in coupled relation with a smaller coil 48,

which is interposed in the circuit of a secondary inductance coil 50. secondary circuits of the radio receiving apparatus include

condensers

52 and 54 respectively. As shown the condensers are of-the type comprising semi-circular plates which are alternately fixed and movable. The movable plates of the condenser 52 in the primary circuit are mounted on an arbor 56 which extends through the panel of the cover and Fast on the end of the arbor 56 within the chamber 44 of the cover is a relatively large spur gear 62 meshing with a small pinion 64 fixed to the end of a stud shaft 66. The shaft 66 is also extended through the panel 40 and is provided on the exposed side of the panel with a knob 68 which may be turned to adjust the condenser.

The condenser 54 in the secondary circuit of the radio receiving apparatus is similar in general construction to the condenser 52 in the primary circuit and includes an arbor 70 extended through the panel 40 and provided on the exposed side of the panel outside of the chamber 44 with a disc 72. In order to guide the user of the machine in adjusting or tuning the radio receiving apparatus, the disc 7 2 is preferably graduated or indexed with its front face, as clearly appears from Fig. 1, and has associated with it a pointer 74 carried by the panel 40. Mounted on the end of the 1 arbor 70 within the chamber 44 is a spur gear 7 6 which meshes with a small pinion 78 on a stud shaft 80, also extended through the panel 40 of the 'cover and provided on the exposed side of the panel with a knob 82 by which the condenser 54 may be readily adjusted.

The radio receiving apparatus comprises vacuum tubes of the three electrode type, and the panel 40 of the cover 4 of the casing is perforated so as toenable the vacuum tubes to be rendered readily accessible for'inspection or replacement from outside of the chamber 44, or in other words, from the side of the panel 40 which is exposed when the cover 4 is in open position. In the illustrated embodiment of the invention, five vacuum tubes designated 84, 86, 88, 90 and 92 are employed, and the panel 40 is formed with a single rectangular opening 94, extending substantially from side to side of the cover 4 and containing a similarly shaped plate 96 spaced at its edges from the edges of the opening 94 so as to be freely movable relatively to the panel 40.

The plate 96 is provided on its exposed face with supports 98, Figs. 5 and 7, upon which the vacuum tubes are mounted in substantial parallelismwith the plate 96. An apertured plate 99 is mounted on the panel 40 within the chamber 44i'ji lsuch a position as toprevent The primary and access to the parts within the chamber 44 I from being obtained by pushing back the plate 96 in the opening 94 of the panel. In order to prevent shocks to which the cover 4 of the casing maybe subjected from being transmitted to the vacuum tubes 8492, the plate 96 is yieldably supported on the panel 40. As shown, the supporting means comprises posts 98 located adjacentto the corners of the plate 96- and connected by relatively stiff coiled springs 100 with posts or screws 102 mounted on the panel. The springs 100 may be filled with absorbent cotton or other suitable material for damping any vibrations of the plate 96, caused by movement of the cover. It is recognized that the arrangement of the vacuum tubes with relation to the panel 40 may be widely varied; for example, the tubes may be located in separate openings in the panel and may be disposed at right angles to it. 7

The circuit of the secondary inductance coil 50 and condenser 544s connected to the grid of one of the vacuum tubes. for example, the tube 84, the plate circuit of the tube 84 including a switch 104 at the left hand end of a switch block 106, Fig. 3, mounted on the panel 40. As shown, the switch 104 includes a segment 108 composed of brass or other suitable metal, four contact studs 110, and a contact member 112 carried by a member 114 pivoted centrally on the switch block 106 and composed of insulating material. The contact member 112 comprises parts arranged for engagement with the segment 108 'and one of the four contact studs 110 depend Each of the four contact studs is connected with the primary coil of one of four radio frequency transformers 116, supported on the panel 40 within the chamber 44 of the cover 4, the secondary coils of the transformers 116 being connected to each of four contact studs 118 of a switch 120 at the other end of the switch block 106. The switch 120 also comprises a segment 122 arranged to be connected with any one of the studs 118 by a contact member 124 carried by the pivoted member 114 and having parts arranged for engagement respectively. with the segment 122 and one of the studs 118.

The inductance of the primary and

secondary coils

46 and 50 may be respectively regulated by suitable switches. As shown in Fig. 8. the switch for the primary inductance coil 46 comprises a contact post 126 connected with the antenna circuit, and a contact member 128 fulcrumed on the post 126 and movable into engagement with any one of a series of four contact points 130 connected to suitably spaced taps along the coil 46. The

switch for controlling the inductance of the crumed thereon a"contact member 134 mov able into engagement with any one of four contact studs 136 electrically connected to the secondary inductance coil at spaced points along the coil. The

contact members

128 and 134 extend beyond their

fulcrum posts

126 and 132 respectively and areconnected to a bar 138, which in turn is operatively connected to a lever 140 fixed to a stud shaft 142 mounted upon and extending through the panel of the cover. The lever 140 is formed with a laterally extending portion 144 pivotally joined to one end of a bar 146, the other end of which is pivotally connected to the member 114

ofthe switches

104 and 120 so as to operate the

switches

104 and 120 simultaneously with the movement of the bar 138; and the consequent operation of the

switch members

128 and 134 of the inductance coils. The stud shaft 142 is provided on the side of the panel outside of the chamber 44 of the cover 4 with a knob 148, and arranged for movement with the knob 148 is a pointer 150 co-acting with a segmental scale bar 152 fixed on the exposed side of the panel 40 and pref erably graduated to indicate the wave lengths for which the inductances of the coils 46 and are adjusted.

The segment 122 is connected to the grid of vacuum tube 86, the plate circuit of which includes the primary of a step-up transformer 152 supported by a bracket 154 on the inner side of the panel 40. The secondary of the step-up transformer 152 is interposed in the grid circuit of the vacuum tube 88, and the plate circuit of the tube 88 in turn includes the primary of a transformer 156 supported by a bracket 158 mounted on the panel 40 adjacent to the transformer 152. The secondary of the transformer 156 is connected in circuit with the grids of both of the

vacuum tubes

90 and 92, and the plate circuit of the tubes 90 and .92 comprises the primary of a transformer 160 supported on the panel 40' by a bracket 162. s shown, the

brackets

154, 158, and

162 of the

transformers

152, 156 and 160 respectivel are mounted on the panel 40 adj acent to the edge of the plate 99 which surrounds the opening 94 in which the vacuum tubes are located. I

Mounted on the inner; surface of the panel 40 between the radio receiving apparatus and a the panel is ametal plate 164 which serves as supported on posts or egs 165, such as are shown in connection with the primary inductance coil 46. The metal plate 164 is con- 4 nected to' ground by means which will be hereinafter more fully described, and which respectively on the panel 40 and in the upper part of the main body 0 f the casing of the machine and at the rear of the machine.

As shown most clearly in Figs. 5 and 7, the primary inductance coil 46, coupling coil 48 and primary condenser 52 are housed in a metallic shield 171 shaped to correspond with theinner surfaces of the cover 4. The sec ondary inductance coil 50 and the secondary condenser 54 are housed in a similar shield (not shown). The shields 171 are mounted on the ground plate 164 in spaced relation to each other and act not only to prevent physical injury to the enclosed parts during the insertion or removal of the panel 40, but also to shield the two circuits from electrostatic and magnetic fields produced by external agencies and to prevent electrostatic or magnetic interaction between the two circuits. The circuit arrangement and manner of operation of the radio receiving apparatus will be best understood by reference to Fig.

includes terminal blocks 168 and 170'located 9 in which the antenna is designated generally by 172 and is joined to a connecting stud 174 on the terminal block 170 supported on the main body portion 2 of the casing. From the connecting stud 174 the antenna current passes along a flexible lead 176 to a connecting stud 178 on the terminal block 168 located 7 on the panel 40. A wire 180 conducts the current from the stud 17 8 to the contact post 126 of the switch 128 of the primary inductance coil 46. From the switch 128 the current passes through a smaller or larger portion of the length of the inductance coil 46, according as the switch is arranged to engage the contact point 130 A, 130 B, 130 C or 130 D. As shown, the switch 128 is in contact with the point C, so that a relatively large 1 portion of the inductance of the primary coil 46 is included in the antenna circuit. The

antenna circuit is continued through the pri mary tuning condensed 52 and thence to ground through the metal plate 164. The connections between the metal plate 164 and ground include a wire 181 attached to a con necting stud 182 on the terminal block 168, a

flexible lead 184 connecting the stud 182to' a stud 186 on the terminal block and a wire 187 leading from the connecting stud 186 to ground. A second wire 188 connects the stud.186 to the negative side of a battery 166 (Fig. 9). v V

The coupling coil 48 in the secondary circuit of the radlo receiving apparatus is connected at one of its ends to ground by a wire 194 and atits other end to the contact post 132 of the switch 134 of the secondary inductance coil 50. Assuming that the switch 128 l of the primary inductance coil 46 is set to contact with the stud 130 G, then by reason of the common operating bar 138 for the switches 128' and 134, the switch 134 of the second inductance coil 50 will be set to contact with stud 136 C so as to cause the inductance in the secondary tuning circuit of the radio receiving apparatus to correspond with the inductance in the primary or antenna circuit. The end of the inductance coil opposite from its connection with the switch 134'is connected with the grid of the vacuum tube 84, and the secondary tuning condenser 54 is connected in shunt with the coupling coil 48 and inductance coil 50.

The vacuum tube 84 acts as a radio frequency amplifier, and its plate circuit is taken from the battery 166 through a wire 196 at a suitable voltage, for example, 110 volts, to a connecting stud 198 on the terminal block 170. The stud 198 isjoined by a flexible lead 200 to a connecting stud202 on the terminal block 168 of the cover 4. A wire 204 connects the stud 202 to a conductor 206 which is in turn connected to the primary coils of the radio frequency transformers 116. As shown, the current passes through the primary coil of the transformer 116 O to the contact stud 110 C of the switch 104. The contact member 112 of the switch 104 conducts the current to segment 108 of the switch, and from thence to the plate of the vacuum tube 84. The plate circuit of the tube 84 is completed by connecting the filament of the tube to ground through the metal plate 164.

Each of the secondary coils of the radio frequency transformers 116 is connected at one end to ground through the metal Plate 164 and at its other end to one of the contact studs 118 of the switch 120. In the illustrated position of the parts, the current passes from the secondary coil of the transformer 116 C to the stud 118 C, then through the contact member 124 of the switch 120 to the segment 122 and from thence to the grid of the vacuum tube 86. The illustrated machine is particularly designed to receive speech, music, etc. sent out from'broadcasting stations for the purpose of public information or entertainment. It is customary in broadcasting to im pos'e the speech, music, etc. as audio or tone frequency modulations upon a suitable radio frequency. The vacuum tube 86 serves to detect the audio frequency modulations of the received energy. A condenser 210 and grid leak 212 are preferably interposed in parallel f in the grid circuit of the tube 86 between the grid and the segment 122.

As clearly appears from Fig. 3, the radio frequency transformers 116A, 116 B, 116 C and 116 D progressively increase in size from 116 A to 116D and have varying constants corresponding respectively to the constants of the primary and secondary tuning circuits when the

switches

128 and 184 are in engagement with the contact studs (130, 136) A, B, C and D. It ,will also be understood that, if the

contact members

112 and 124 of the

switches

104 and 120 are in contact with the studs 110 A and 118 A, the plate current of the vacuum tube 84 will not pass through the transformer 116 C but will pass through the primary coil of the transformer 116 A, and the grid of the detector tube 86 will be connected to the secondary of the transformer 116 A instead'of to the transformer 116 C. Manifestly, if the

switches

104 and 120 are set at the contactposts (110, 118) B or D, the radio frequency that the constants of the radio frequency transformer apparatus are correspondingly changed simultaneously with changes in the constants ofthe tuning circuits.

The plate circuit of the vacuum tube 86 includes the conductor 206' and its connections with the battery 166 and further includes a wire 214- leading from the conductor 206 to one end of the primary coil of the step-up transformer 152. The other end of" the primary of the transformer 152 is-connected with the plate of the tube 86, and the plate circuit of the tube is completed'by grounding the filament of 'the'tube through the metal plate 164. A condenser 216 is provided in the plate circuliot of the vacuum tube 86 in shunt with the tu e.

The secondary of the transformer 152 is connected at one end with the grid of the vacuum tube 88 which produces the first step of audio frequency amplification and at the other end to a wire 218 and a conductor 220 leading to a connecting stud 222 on the terminal block 168. The connecting stud 222 is in 3 turn joined by a flexible lead 224 with a stud 226 on the terminal block 170, and a wire 228 leads from the stud 226 to the battery 166. As indicated in Fig. 9, the wire 228 is connected to the battery 166 at a point having a potential of 3 volts with respect to the negative end of the filament, inasmuch as excellent results have been obtained in practice from the use of such potential- 1 The plate circuit of the audio frequency am- T plification tube .88 includes the primary coil of the transformer 156 and a wire 230 connect-' ing the coil with the conductor 206. The

above circuit is completed through the filaall of the tubes. The connection of the filaments of the

tubes

90 and 92. to ground at the metal plate 164 completes their plate circuits. The circuits of the

vacuum tubes

90 and 92 afford a second step of audio frequency amplification in addition to the first step produced by the tube 88. r

The current for lieating the filaments of the vacuum tubes 84-92 'is taken from the battery 166 at relatively low potential, such as, for example, +4, 5 volts, and is conducted along a wire 234 to a connecting stud 236 on the terminal block 170 and from thence through a flexible lead 238 to a connecting stud 240 on the terminal block 168. The current then passes to a conductor 242 common to the filaments of all of the vacuum tubes.-

' The heating circuits are completed through "li ered thereby.

the connection of the filaments to the 'metal plate 164. r

The plate circuit of the second audio frequency amplification unit comprising the

vacuum tubes

90 and 92 is transmitted by the transformer 160 to a circuit including a wire 244 joined at one end to the ground plate 164 and at its other end to a connecting stud 246 on the terminal block 168. The stud 246 is in turn connected by a flexible lead wire 248 to a stud 250 on the terminal block 170, from which a wire 252 leads to a switch 254. The switch 254 is normally closed so that the current induced in the wire 244 is conducted through a binding post 256 and wire 258 to 'the telephone 36 mounted on the lateral branch 20 of the horn 12. The return circuit of the telephone is through a wire 260 to the wire 188 and thence to the battery 166 and ground. A condenser 262 is preferably arranged in shunt with the telephone 36'to improve the tone of the speech or music de- In order that external headband or ear telephone receivers may be employed, when desired, to enable reception from distant broadcast stations or to enable one or more persdns to receive speech or music from the radio receiving apparatus without emission of sound from the horn 12 of the machine, a metal sleeve 264, Fig. 7, is mounted in the body portion 2 of the casing in electrical con nection with the wire 260 between the telephone 36 and the ground wire 188. As shown, the metal sleeve 264 is arranged to receive a plug connected with the headband or car telephones, and the switch 254 in the circuit of the telephone 36 is arranged in the machine with reference to the sleeve 264, so that the insertion of the plug into the sleeve breaks the circuit of the telephone 36 at the switch 254 and completes a connection from the wire 252 through the headband telephone .and the sleeve 264 to the wire 260 and thence to ground.

The radio receiving apparatus of the machine is thrown into and out of operation'by a main switch 266, Fig. 1, mounted on the panel 40 of the cover 4 and connected to any F 20 from entering the other branch and setting up vibrations therein which might interfere with or deleteriously afiect the quality of the sound emitted from the horn, the horn is provided with a valve 267, Fig. 6, pivotally mounted at the junction of the

branches

18 and 20. The valve 267 is arranged to swing between two positions, in one ofewhich, as shown in full lines in Fig. 6, it allows communication between the upright branch18 and the body of the horn and shuts off communication between the body of the horn and the lateral branch 20,-and in the other ofwhich, as shown in broken lines in said figure,

it allows communication between the main body of the horn and the lateral branch 20 and shuts off communication between the horn and. the upright branch 18. Means is prefer-,

ably provided for automatically operating the valve 267 so as at all times to allow communication between the main body of the horn and the branch to which sound is being communicated and to shut ofl communication between the body of the horn and the other branch. As shown, said means comprises an arm 268 fixed to the valve 267 and normally maintained by a spiral spring 270 in the position shown in full lines in Fig. 6, in which the main body of the horn 12 is in communnication with the uprightbranch 18 leading from the phonographic apparatus and is shut off from communication with the lateral branch 20 connected with theotele phone 36 of the radio receiving apparatus. In order to cause the valve 267 to be moved from the full line position to the broken line position, as shown in Fig. 6, .upon operation of the radio receiving apparatus, an electromagnet 272 of the solenoid type is mounted on the horn adjacent to the arm 268, and the arm 268 is formed with a projection composed of magnetic material and extended within the electromagnet 27 2. As shown most clear- .ly in Fig. 9, the electromagnet 272 is interposed in the filament heating circuit of the vacuum tubes, so that when the switch 266 is thrown in to initiatethe operation of the radio receiving apparatus, the current is caused to flow through the electromagnet. The consequent attraction of the arm 268 by the electromagnet 272 swings the valve 267 from the full line position, shown in Fig. 6, to the broken line position, thereby placing the body of the horn 12 in communication with the branch and shutting off communication between the main body of the horn and the upright branch 18.

As shown in the drawings, the terminal block 168 on the panel 40 of the cover 4 is arranged centrally of the rear end of the panel, and the flexible lead wires 184, 200,248 etc. are led from the terminal block 168 along the rear inner surface of the cover, where they maybe held in place'by a suitable cleat 274 to the terminal block 170 which depends from the top plate 22 of the main body portion 2 of the casing. The connecting wires between the terminal block 170 and the battery 166 are preferably contained in a single cable 276 extending downwardly to the bottom of the compartment 10 of the casing and leading to contacts 278, Fig. 2, secured to the floor of the compartment 10 and having the wires connected therewith. The radio receiving apparatus is so organized that it requires no external source of power, only replaceable dry batteries being needed for the vacuum tubes, so that the machine may be used irrespective of any external power supply. The batteries may be installed in a single container or box 280,'Fig. 4, provided on its bottom with suitable contact plates arranged to engage the contacts 27 8 when the battery is inserted within the casing. The insertion and removal of the batteries may be further facilitated by the provision of tracks 282 secured to the floor of the compartment 10 and adapted to slidably engage suitably formed parts on the battery box 280. To the end that shocks may be avoided, the closing movement of the cover 4 is controlled by a device 284, Fig. 4, mounted in the compartment 10 of the body portion 2 of the .casing and operatively connected with the cover 4 by a link 286, Fig. 2. Further disclosure of the battery 166 and the means for controlling the movement of the cover 4 is believed to be unnecessary, inasmuch as the construction and arrangement of such parts constitute per se no part of the present invention.

Ready and convenient access is permitted to the compartmentiO of the body portion 2 of the casing of the machine by means of a door 286 hinged at 288 at the rear side of the compartment. By reason of the provision of the hinged door 286 the battery box 280 may be easily replaced, and any necessary or desired repairs or adjustments may be readily made to the parts contained in the compartment 10, including the horn 12, the cover controlling means, and the. telephone 36.

The amplitude of the speech? or music emitted by the radio receiving apparatus may be increased or decreased by eifecting a closer or looser coupling between the coil 48 of the secondary tuning circuit and the primary coil 46 of the antenna circuit. Such an ad3ustment may be effected by turning the knob entire exterior surface.

290 mounted on the exposed side of the panel 40, Fig. 1 and provided with suitable means for indicating the appropriate adjustment for rendering the sounds louder or softer.

From the foregoing, it will be understood that the

condensers

52 and 54 in the primary and secondary tuning circuits respectively, of the radio receiving apparatus, the knob 148 for operating the

switches

128 and 134 of the inductance coils 46 and 50 and the

switches

104 and 120 of the radio frequency transformers 116, the main switch 266, and the knob 290 constitute controlling elements for the radio receiving apparatus and that these elements are extended through the panel 40 of the cover 4 so as to enable them to be operated from the exposed side of the panel. It will also be understood by reference particularly to Fig. 5 that by the provision of the radio receiving apparatus on a movable member, such as the cover 4 of the machine, the controlling elements of the radio receiving apparatus may normally, that is, in the closed position of the cover, or other movable mounting be arranged in close juxtaposition to the a controlling elements of the phonographic apparatus so as to conserve space within the machine casing.

For the sake of clearness of illustration, the cover 4, as shown in Fig. 5 of the drawings, is relatively deep, and the controlling elements of the radio receiving apparatus are spaced somewhat further than is necessary from the phonographic apparatus. It will, therefore be seen that the radio receiving apparatus may be installed in a cover of considerably less depth than that shown in Fig. 5 without danger of interference with the sound box 26 or other parts of the phonographic apparatus of the sound reproducing machine. When the cover 4 is in its normal or closed. position, the controlling elements of the radio receiving apparatus are invisible,

so that the sound reproducing machine of the present invention may be caused to present a smooth and unbroken appearance over its It will be noted, however, that when the cover 4 is opened, the controlling elements of the radio receiving apparatus are moved away from the phonographic apparatus so as to render them not only visible, but also readily accessible to the operator. In fact, when the cover 4 1s fully opened, the controlling elements of the radio receiving apparatus are mounted on the front face of the cover, Fig. 1, in an extremely convenient position for actuation by the operator. Furthermore, the provision of the radio receiving apparatus in the cover of the machine casing enables a sound reproduclng machine comprising both phonographic and radio receiving apparatus to be constructed with no greater expense as to the cabinet part of the machine than in the case of a phonograph only, inasmuch as the radio receiving apparatus is mounted in a space, which in a phonograph is totally unused.

The operation of the controllin elements of the radio receiving apparatus is acilitated in the illustrated machine, not onlyby mountin the radio receiving apparatus on the machine in such a manner as to render its controlling elements extremely, convenient for normal operation, but also by the provision of means for indicating the order in which the controls. of the radio receiving apparatus should be adjusted. Such indicating means is shown most clearly in Fig. 1 wherein the numerals'l, 2, 3, 4 and 5 are applied respectively to the main switch 266, the wavelength. controlling means 148, the tuning condenser 54 ofthe secondary circuit, the condenser 52 of the primary circuit and the knob 290 for regulating the loudness of the sound emitted from the machine. The

numbers

1, 2, 3, 4 and 5 indicate to an unskilled operator that in the operation of the radio receiving apparatus the main switch 266 should first be closed, that theknob 148 should then be set in accordance with the wave length of the station which it is desired to receive; that the secondary condenser 54 should next be also adjusted to the desired wave length, and that the condenser 52 which may or may not be graduated should then be turned to the osition which aiiords the best response, the nob 290 being finally set in the proper position depending upon whether it is desired that the speech .orfmusic being emitted from the machine be loud or soft. The'provision of the above-described means distinct fromthe controlling elements of the radio receiving, apparatus for indicating the order in which the controls should be operated, enables the production for the first time, so far as applicant is aware, of a radio-receiving set which can be operated by an unskilled or untrained person with practically as good results as by a skilled operator, and hence constitutes an important practical advance in the development of radio receiving'apparatus for purposes of public information and entertainment.

The radio receiving apparatus of this invention may not only be incorporated in new sound reproducing machines comprising radio receiving apparatus and phonographic apparatus, but it may also be a plied as a radiola adjunct or receiver to p onographs already constructed and inuse. Moreover, by reason of the construction and arrangement of the radio receiving apparatus, it may be applied to existing phonographs having compartments for containing phonographic apparatus and record albums respectively, without increasing the size of the phonograph casing or reducing the available size of any of its compartments, so that the usefulness of the phonograph is inno way affected or its operation interfered with by the additien of suitable phonogr'aphby a local electrician or carpenter.

Having described my invention, what I claim is:

1. In a sound reproducin machine, a casing comprising a main bo y portion and a member pivotally mounted on the body portion for movement relatively thereto, honographic apparatus mounted in the body portion of the casing and radio receivin apparatus mounted on said movable mem er and comprising controlling elements normally contained within the casing so as to be invisible, said member and said controlling elements being so constructed and arrange as to render the controlling elements visible and readily accessible to the operator solely upon movement of the member relatively to the main body of the casing and a common sound amplifier within the main body portion of the machine which is adapted to be selectively energized by either the phonograph or radio apparatus.

2. In a sound reproducing machine, a casing comprising a plurality of portions pivotally connected together for relative movement, one of said portions constituting a main body portion of the machine, aset of photographic apparatus mounted in one of said portions of' the casing, a setof radio receiving apparatus mounted in an; other of said portions, controllingelements for the phonographic apparatus and for the radio receiving apparatus, said controlling elements being normally contained within the casing so as to be invisible and being located close together so as to conserve space, and said controllin elements and said portions of the casing being so constructed and arranged as to render the controlling elements visible and to separate the controlling elements of one of said sets of apparatus from the controlling elements of the other set of apparatus solely upon relative movement of the portions of the casing, so as to render the controlling elements readily accessible to the operator and a common sound amplifier within the main body portion of the machine which is adapted to be selectively energized by either the phonograph or radio apparatus.

3. In a sound reproducing machine, a casing phonographic apparatus mounted in the easing and connected with one of the branches of'the horn, radio receiving apparatus mounted in the casing and connected with the other branch of the horn, a switch for controlling the operation of the radio receiving apparatus and means for automatically shutting ofi' communication between the main body of the horn and said first-mentioned branch upon actuation of the switch to cause communication of sound by the radio receiving apparatus to the other of said branches.

5. In a sound reproducing machine, a casing, a two-branch horn mounted in the casing, a set of phonographic apparatus mounted in the casing and connected with one of the branches ofthe horn, a set of radio receiving apparatus mounted in the casing and connected with the other branch of the horn, a device for controlling the operation of one of said sets of apparatus, and means for agtomatically shutting ofl communication b tween the main body of the horn and one of said branches upon actuation of the controlling device to cause communication of sound to the other of said branches.

6. In a sound reproducing machine, a casing, a two-branch horn mounted in the casing, two sets of sound reproducing apparatus connected respectively to the two branches of the horn, a device for controlling the operation of one of said sets of apparatus, and means for automatically shutting off communication between the main body of the horn and one of said branches upon actuation of the device to cause communication of sound to the other of said branches.

7. In a sound reproducing machine, a casing, a two-branch horn mounted in-the casing, phonographic apparatus mounted in the casing and connected with one of the branches of the horn, radio receiving apparatus mounted in the casing and connected with the other branch of the horn, a switch for cdntrolling the operation of the radio apparatus, common vmeans for automatically controlling communication'between the main body of the horn and said branches, said means being normally set to allow communication between the body of the horn and the first-mentioned branch, and connection between said means and said switch for operating said means upon the throwing in of the switch to establish communication between the main body of the horn and the second-mentioned branch and to shut of! communication between the main body of the horn and the first-mentioned branch.

branches of the horn, radio receiving apparatus mounted in the casing and connected with the other branch of the horn, a switch for controlling the operation of the radio re- 'CBlVlD g apparatus, a valve in the horn mounted for movement between two positions, in

one of which it allows communication between the body of the horn and the firstmentioned branch and shuts ofi' communication between the body of the horn and the second-mentioned branch and in the other of which it allows communication between thebody of the horn and the second-mentioned branch and shuts off communication between the body of the horn'and the first-mentioned branch, a spring for normally maintaining I 9. In apparatus of the character described,

a branched horn, a telephone connected to one branch of said horn, a phonograph reproducer having communication through a tone arm to another branch of said horn, radio receiving apparatus, means for controlling the energization of said radio receivmg apparatus, mechanism for shutting off either of said branches from the main body of said horn, and operating connections between said means and said mechanismjor actuating said mechanism upon the energization of said radio receiving apparatus, so that when said radio receiving apparatus is energized, the branch having communication with the phonograph reproducer is shut off from the main body portion of said horn.

10. In combination, a branched horn, radio apparatus, phonograph apparatus, a reproducer connected to one branch, a telephone connected to another branch, a valve in said horn for shutting off either of said branches from the main body portion of said horn, and means including aswitch for energizing said radio apparatus and simultaneously actuating electro-magnetically said valve so that when said radio apparatus is energized the branch leading to the phonograph reproducer. is shut ofi from the main body portion of said horn and the. branch leading to the telephone is placed in communication with the mainbody portion of the horn.

graphic apparatus mounted in said cabinet, a sound amplifier also mounted in said cablnet, a, hollow closure pivotally mounted on said cabinet, and radio receiving apparatus mounted wholly within said closure hollow, said phono aphic and radio apparatus being selectively associated with said amplifier for transmission of sound thereto.

ALFRED N: GOLDSMITH.