US1658562A - Radio receiving apparatus - Google Patents

Description

Feb. 7, 1928.

. A. A. KENT RADIO RECEIVING APPARATUS Filed April 5. 1926 3 Sheets-Sheet 1 wvsurom lrfkwr Itwater 2 126 M 1 6% A TTOIPIVEK Feb. 7, 1928.

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ATTORNEK Feb. 7, 1928. 1,658,562

A. A. KENT RADIO RECE IVI NG APPARATUS Filed April 5. 1926 3 Sheets-Sheet 3 l ffl gi 6' 7 INLENTOR. a? 12 Alffiuf Afiwafer [l en/t;

BY My @53 2' ATTORNEY.

fill

Patented Feb. 7, 1928.

UNITED STATES ARTHUR ATWATER KENT, OF ARDMORE, PENNSYLVANIA.

RADIO RECEIVING APPARATUS.

Application filed April 5, 1926. Serial No. 99,686.

My invention relates to radio receiving apparatus, and more particularly to a cabinet, hous ng, box or the like within which are supported the various parts or elements comprised in the aforesaid apparatus.

In accordance with my invention, there 18 provided a one-piece metallic cabinet for housing or enclosingany sultable type of radio receiving apparatus, and more part cularly, the apparatus aforesaid is supported within the cabinet solely by a panel or the like in turn secured to a part of the cabinet, as the front wall thereof.

Further in accordance with my invention, to a wall of a one-piece metallic 'cabinet,preferably dome or arch-shaped, and in spaced parallel relation therewith, there is secured a panel or plate comprising an angularlydisposed shelf or ledge parallel with but closely adjacent the top of the cabinet and depend ng from said shelf or ledge in invcrted positions are parts of the receiving apparatus, as the vacuum tubes and transformer structure, and more particularly, the shelf or ledge aforesaid comprises one or more plates of insulating material having disposed on its or their surface or surfaces nearest the cabinet top the vacuum tube sup porting structure. I

Further in accordance with my invention, there is provided a cabinet supported'by or having a base provided with one or more slots whose dimensions are such that a vacuum tube may be passed therethrough to the cabinet interior.

My invention resides in apparatus and features of construction of the character hereinafter'described and claimed.

For an illustration of some of the various forms my invention may take, reference is to be had to the accompanying drawing in which:

Fig. 1 is a front elevational view of radio receiving apparatus constructed in accordance with my invention.

Fig. 2 is an inverted plan view showing the interior of the cabinet and some of the apparatus contained therein.

Fig. 3 is a vert cal sectional view on the line 3-3 of Fig. 2.

Fig. 4 is a vertical sectional view taken on the line 4-4 of Fig. 2. p

Fig. 5 is a vertical sectional view taken on the line 5- 5 of Fig. 4.

Figs. 6 and 7 are transverse vertical sectional views taken, respectively, on the lines 6 6 and 7-7 of Fig. 4.

Fig. 8 is an enlarged view corresponding substantially with Fig. 6 but showing a base of a modified form.

Fig. 9 is a vertical sectional view taken on the line 9-9 of Fig. 8.

Fig. 10 is a vertical sectional view taken on the line 10-10 of Fig. 8.

Fig. 11 is an elevational view of a bowed spring for exerting an axial thrust on the rotor shaftof a condenser.

Fig. 12 is an elevational view of another form of bowed spring for exerting an axial thrust on the rotor shaft of a condenser.

Fig. 13 is a plan view of a plate for securing the rotor structure of a condenser to a frame.

Fig. 14 is a fragmentary sectional view showing the supporting structure of a radio fre ucncy transformer.

ig. 15 is a vertical sectional view showing the bowed spring of Fig. 12 in engagement with a rotor shaft.

Referring to the drawings, there is illustrated a radio receiving set comprising a cabinet, housing or box resting upon and supported by a bottom or base B havin along its lower surface a layer or strip 0 suitable material, as the felt strip 5, for protecting the surface of a table or other support upon which the radio set is placed. As shown in Figs. 1 and 3, base B is of wood and is provided with a peripheral channel or notch b against whose vertical edge, as viewed in Figs. 3, 4, 6 and 7, abuts the inside lower surface or edge of cabinet C. It

- shall be understood that base B may be constructed of a material or composition other than wood, for example, of metal, as iron,

steel, aluminum, or the like, and that cablnet C may be supported upon base B in any convenient and suitable manner.

Cabinet G, of any suitable insulatin or conducting material, but preferably Ofll'Oll, steel, aluminum or brass, comprises the front and rear-sides or walls a and c, the end sides or walls 0 and c, all connected by a top member 0 Preferably cabinet C is formed or shaped from a single piece of metal into a simulation of an inverted dome or arch-shaped receptacle, which may be assembled with base B to form the complete cabinet structure for housing or enclosing the radio receiving apparatus, hereinafter described. Preferably cabinet C, alon its lower edge or surface, is curved or ared outwardly, as indicated at Figs. 1, 3, 4, 5, 6 and 7, such flared portion terminating in a vertically extending portion a" coacting with the vertical edge of notch b in base B. If desired, screws 8 may be utilized for effecting connection between cabinet C and base B, Figs. 6 and 7.

Suitable supporting members, as the Z- shaped an les 1, Fig. 5, are welded or otherwise suita ly secured to the interior surface of the front wall a of the cabinet, preferably immediatel adjacent each end thereof. Suitably secure to members 1, as by screws 2 or the like is the angular bracket or supporting frame F comprising, as viewed in Figs 6 and 7, a vertical extending panel or late 3 and a horizontally extending shelf or edge 4. Preferably, frame F constitutes the sole support for the condenser, transformer and ot er structure comprised in the receiqin set, as hereinafter more fully described.

on the panel 3 are mounted several variab e ad'ustable tuning devices, such as variable in uctances, or, and preferably, as indicated, variable tuning condensers for tunin two or more circuits of the receiving set. 11 the example illustrated, three variable condensers K, K and K are mounted upon the panel 3 and have their rotors or adjustable elements mechanically coupled for simultaneous adjustment in unison by a single knob 'or handle on the outer side of the front wall or side 0 of the cabinet C. By reference, the condensers aforesaid are 0 the character described and claimed in my copending application, Serial No. 104,262 filed April 24, 1926.

As illustrated, condensers K, K and K are duplicates, or substantially so, with the exception that the middle condenser K has a longer rotor shaft and is provided with a different type of spring mounted in a somewhat different manner for exerting an axial thrust on said shaft, as hereinafter more full described. Each condenser comprises, as ilustrated by condenser K Figs. 6 and 8, a bracket or frame terminating in the upper and lower horizontal shelves or ledges 5" and 5", which, as described in my aforesaid application, should extend, respectively, from t I at angles of exac y ninety degrees. To the upper and lower horizontal shelves or ledges 5 and 5 are secured, respectively, in suitable manner, as by one or more rivets 6, the members or plates 7 of insulating material as a phenol condensation product, hard rubber, a fabric, as linen or canvas impregnated in a pglenol condensation product or the like.

formed of impregnated canvas as described e vertical portion of frame portion 5- herein shown, plates 7 are,

or bracket 8 in any suitable manner, as by the screws 9 passing through the slots 9, Fig. 13, elongated in a direction extending at right angles from the vertical portion of frame 5 for adjustably mounting the rotor plate structure, as more fully described in my aforesaid application. Preferably, a washer plate 10 or the like is disposed on each plate 7 between the heads of screws 9 and the outer plate surface.

Bolts or screws 11 passing, respectively, through bracket 8 adjacent its an larly disposed arms support the stator plates 12 held in spaced relation thereon by washers 13 or the like. Exteriorly of bracket 8, the lower bolt 11, as viewed'in Figs. 6 and 8, receives a pair of nuts 14 or the like. Between the nuts 14 on the lower respective bolts 11 of condensers K and K the neutralizing grid resistances 15 may be secured and to the lower bolt 11 on condenser K the grid leak condenser 16, Fig. 4. Onto the upper bolt 11, of condenser K, as viewed in Fig. 6, there is likewise threaded a pair of nuts ,14 between which may be received alug o'r terminal 17. Similarly, the upper bolts 11 of each of the condensers K and K may carry on their respective ends a pair of nuts between which are received lugs corresponding with the lug 17.

A hearing member 18, which should extend at right angles from frame 5 is suitably mounted in an opening of perforation therein as by peening the end of said member onto the ad3acent portion of frame 5, as indicated at 18, Figs. 6 and 8. Mounted in bearing member 18 is-a shaft 19 carrying the rotor plates 20 held in spaced relatlon thereon by washers 21, said rotor plates interleaving with the stator plates 12. Each rotor shaft 19 comprises a conical bearing 19 and a reduced portion 19. As clearly indicated in Fig. 8, shaft 19 has two bearing surfaces on member 18, namely, in the region where conical bearing 19" engages the tapered end of member 18 and where another ortion of shaft, 19 engages the reduced iametrical portion 18 of member 18. Due to the provision of the reduced portion 19" of shaft 19 which lies between the two bearing surfaces aforesaid, the friction between the parts IS reduced and shaft 19 is more readily maintained in the proper aligned position. If desired, each rotor shaft 19 may be provided with a counter balance weight 19.

As indicated in Fig. 3, panel 3 is provided with a plurality of apertures 22 of substantial diameter formed concentrically with respect to" the respective rotor shafts 19.

For the middle condenser K there is provided a bowed spring 23, Fig. 11, having a centrally disposed perforation through which freely extends the rotor shaft 19 of that condenser when spring 23 is mounted thereon and lies in a perforation 22, Figs. 6

and 8. When thus mounted, spring 23 engages a washer 23 in turn engaging a pulley secured to said shaft for exerting thereon a longitudinal thrust toward the left, Fig. 8, to bias conical bearing 19 into engagement with its seat in the end of member 18 wherei by the rotor plates 20 are properly positioned within the stator plates 12. i

For each of the end condensers K and K there is provided a bowed s ring 24, Fig. 12, having a centrally dispose key-shaped slot through the larger diametrical portion of which extends the rotor shaft of a condenser K or K". After spring 24 has been passed along an end condenser rotor shaft 19 to the position indicated in Fi 15, it may be moved transversely of sai shaft to position the periphery of the smaller diametrical portion of the aforesaid key-shaped slot in a circumferential groove 24 in said shaft. When thus positioned, spring 24 exerts an axial thrust directly on its associated shaft to move the same toward the left, Fig. 15, for the purpose noted above with respect to spring 23. Secured to each rotor shaft 19 of condensers K and K is a pulley whose interior surface, however, is not engaged by spring 24.

If desired, rotation of springs 23 and 24 with respect to their respective shafts may be prevented b providing a lug or projec-. tion 24 on eac condenser frame 5 received in an opening or a erture 25 at or adjacent each-spring en Each rotor shaft 19 of condensers K and K terminates in the space between panel 3 and the front wall a of the cabinet, while the shaft of condenser K extends exteriorly of the cabinet where there is attached thereto the operators knob or handle h, with which may be associated a dial it bearing suitable graduations oo-actin 'with the marker or index k on the ront cabinet wall 0 Secured in any suitable manner upon the rotor shaft 19 of the condenser K between the front wall 0 of the cabinet and frame 5 is, the drum or pulley 27 of any suitable insulating or conducting material, as. occasion may require. In the example illustrated, the pulley 27 is of metal. Secured in any suitable manner, as by the set screws 28 or. the like, upon the respective shafts 19 of condensers K and K are the similar drums or pulleys 29 and 30, disposed between front cabinet wall a and frame 5.

Passing over the pulleys or drums 29 and 27 is the belt or band 31, and passing over the pulleys or drums 30 and 27 is the belt or band 32. The members 31 and 32 may be, of any suitable material, metallic or other wise; in the example illustrated, they are pillgbons of brass, phosphor bronze or the To ensure that the several rotors of the different condensers be maintained always in the same angular positions with respect to each other throughout their adjustments, there are provided means for reventing creeping or slippage of the ban or belts 31 and 32 with respect to the pulleys with which they en age. Such means may be of any suitable c aracter, and, in the example illustrated, comprises pins 33, 33 on the pulleys 27 and 30, extending radially from their belt or band-engaging surfaces and extending throu h closely fitting apertures in the band 32. Similarly, pins 34, 34: are pro vided on the pulleys 27 and 29 and extend through closely fitting apertures in the belt 31.

Suitable stop structure may be provided for limiting the extent of rotation of the condenser rotors. For example, it is desirable to thus restrict such rotation when the rotor plates have been moved to positions either wholly within or wholl without the stator plates. To this en there may be utilized the counter-balance weight 19 on shaft 19 of the middle condenser K in conjunction with suitable stop structure herein disclosed as comprising a bracket 35 or the like, suitably secured, as by a spotwelding operation, to the interior surface of the plate or bracket 5 of condenser K below the rotor shaft 19. By providing two or more inwardly extending prongs or lugs 35 on plate 5, bracket 35 may be secured in predetermined position thereon when correspondingly positioned openings on said bracket receive the lugs 35 aforesaid, Fig. 10. Bracket 35, in the example shown, comprises three angularly. extending arms or flanges 35". Rising from the centrally-disposed flange 35 is a lug or projection 35 entering an aperture in a member 36, preferably of resilient material, resting upon the centrally-disposed flange 35 and passing beneath the similar flanges at the end of bracket 35.

The ends of member 36 are positioned in the path of counter-balance weight 19 and, preferably, such ends are upturned as indicated at 36, Fig. 10.

As described in my aforesaid application, due to the configuration of the rotor plates, there results an unequal distribution of weight and to counteract this, the counterbalance 19 should be non-symmetrically arranged on the rotor shaft with respect to the rotor plates. Accordingly, when so arranged, to restrict rotation of the rotor plates, either when wholly within or wholly without the stator plates, bracket 35 and member 36 should be tilted, as indicated in Fig. 10. y

constructional features involving the mechanism herein disclosed to effect cou pling of the rotors of the tuning condensers is described and claimed inmy co-pending application Serial No. 79,100, filed January 4 1926.

Carried by the shelf 4 of the frame F and suitablysecured thereto, as by bolts 36 is a member or plate 37 of insulating material, as a phenol condensation product or hard rubber. As shown in Figs. 5 and 6, plate 37 overlies the condenser structure comprising the units K, K and K and forms a. support for the radio frequency transformers T, T and T each of which in the example shown comprises a cylindrical core or shell 38 on which is wound or coiled a primary P and a secondary S, a layer of suitable insulating material 39, as varnished paper, intervening between the two coils and S.

Transformers T, 'I and .T. may be secured to plate 37 in any suitable manner. To this end, and as one'manner of so doing for each transformer, I may attach a bracket 40 preferably of non-magnetic material,-as brass, to plate 37 by bolts 40 or the like. By groovin the ends. of the bracket arms, as indicate at 40", Fig. 14, the respective i cores 38, may be rigidly clamped or secured in position by a bolt 41 or the like through the arms of each bracket.

Plate 37 may also support terminals or binding posts 42 and 43 adaptedto be connected, respectively, to the antenna or open passing absorption path and to ground or counterperforations 50in plate 3 plate 37.

capacity. Preferably, terminals 42 and 43 rise from the same-side of plate 37 as do the transformers T, T and T Terminal 42 extends through late 37 and is connected to and secures a exible clip 44 or the like to Terminal 43 preferably extends through shelf 4 and plate 37 and is connected to a lug 45 or the like to which there is secured in conductive relation a coil or wind ing 46, Fig. 5, utilizable as an auto-trans former, for example, in the m nner described in Miller application, Seri 1 No. 73,- 091, filed December 4, 1925. A flexible clip 47 is riveted or otherwise" suitably secured to plate 37 and in the example shown is interposed between said plate and winding 46. Similar flexible clips 48 and 49 are likewise suitably, secured to plate 37 insubstantially symmetrical relation with respect to clips 44 and 47.

Each of the clips aforesaid, adjacent the rivets or other devices securing the same to plate 37 comprise portions angularly related with respect to the clip portions lying, on said plate to which angular plortions may be respectively soldered or ot erwise 's'uitably secured conductors or wires, not shown. At their other ends, each of said clips comprise substantially similar angular ortions, respectively, overlying in art the oles or through which extend the prongs or terminals of a thermionic vacuum tube which may be utilized as 1,ess,5ca

a coupling tube, for example, in the manner described in the Miller ap lication aforesaid. It will be observed t at the relation of parts is such that wiping contact is effected between the angular portions of clips 44, 47, 48 and 49 and the tube prongs thereby eflect-ing good electrical contact between the co-acting elements and effectually holding the tube in position on member 37. It will also be observed that one pair of the perforations 50 are of greater. diameter than the other pair. Accordingly, upon proper selection of the diameters of the tube prongs, it results that the tube may be associated with clips 44, 47 etc., only when occupying one predetermined position, and, as a result, the same elements of the tube will always be brought, respectively, into a conductive relation with the same clips.

As herein shown, two other similar groups of clips similar to those described above are arranged in suitable spaced relation on plate 37 for the reception of the radio frequency tively, w1th the groups of second" member or plate 58 which may beformed of material corresponding with plate 37 but preferably is of greater width. As

herein shown, three similar groups of clips similar to those described above are arranged in suitable spaced relation on plate 58 for the reception of a detector and two amplifying tubes. In the example shown,

said groups comprise, respectively,the clips 59', 60. 61 and 62 associated, respectively, with the groups of perforations 63, Fig. 5. If desired, and this construction may be utilized 'with those clips on plate 37, the'clips 59, 60,. etc., may be maintained in proper spaced relation by knobs or projections 64 formed preferably integrally with plate 58 and rising between said clips.

Carried by plate 58 are a pair of spring clips 65 connected by conductors, not shown, in the output circuit of the last tube in the audio frequency series. To these cli s may be connected the cords or conductors lieading to a signal-indicating instrument, as a telephone, loud-s eaker, or the like.

As herein s own, a suitable detector plate by-pass condenser 66. is associated with plate 58. Ordinarily, condenser 66 need not be secured to plate 58 since the conductors con necting the same in the desired circuit relation are usually of suflicient rigidity to retain it in the proper position. A grid leak resistance 67 may be supported on or adjacent plate 58 in a similar manner, or otherwise, as suitable or desirable. I

Shelf 4 is provided with a number of holes or perforations 68 of different sizes through which pass the conductors, not shown, to various parts of the apparatus, said conductors preferably diverging from a cable 69 passing beneath a U-shaped bracket 70 secured to shelf 4.

On the opposite side of shelf 58 are mounted the audio-frequency transformers T and T and are preferably secured thereto by the bolts 57 terminating on the top surface of ledge 4, Fig. 7.

On the front of panel 3 and covering an aperture A therein is secured a structure R comprising a resistance element or rheostate, not shown, adjustable by a knob or handle 71 and a switch-actuating member 72 utilized for controlling the circuit of the battery or other, current supply for the filaments or cathodes of the tubes comprised in the set. 4

Referring to Figs. 3 and 9, panel 3 of frame F is shown as provided with a plurality of apertures each receiving a stud 73 or the like formed on the frame 5 of condenser K whereby the latter may be accurately located in predetermined portion. On each side of condenser K panel 3 is provided with horizontally aligned pairs of elongated notches, those at the left, as viewed in Fig. 3, receiving studs 74 formed on the frame 5 of condenser K and those at the right receiving similar studs 75 formed on the frame 5 of condenser K. Panel 3 is also rovided with elongated slots as indicated y the broken lines in Fig. 3 through which pass the screws, bolts or the like 76 for securing the frames 5 of condensers K and K to panel 3. If desired, washer plates 77 may be utilized in effecting this connection.

Since condenser K is preferably non-ads justably fixed in position, screws 78 for connecting panel 3 and the frame 5 of that condenser need pass only throu h non-elon-, gated openings in said anel 0 but slightly greater diameter than t eexternal diameter of the screws. With a construction of this character, after loosening screws 7 6 condensers K and K may be readily adjusted toward or from condenser K in a horizontal direction, Fig. 3, to place the bands 31 and 32 under proper tension.

Panel 3 adjacent its ends may likewise be provided with the slotted ortions elongated 1n a horizontal direction, ig. 3, for receiving the screws 2 which secure said panel to brackets 1. With this construction, panel 3 be adjusted in a horizontal direction ma within cabinet 0 to permit structure R and rotor shaft 19 carried by readily passed through the proper apertures in the front wall a of the cabinet. The feature of adjusting bodily a condenser along a panel on which it is mounted as and for the purpose, above described, and of adjusting a mounted panel with'respect to a housing within which it is disposed, as above described, is claimed in my co-pending application Serial No. 244,605, filed January 5, 1928. v

y In the preferred embodiment of my invention, to form the cabinet there is first obtained a flat sheetof metal and by a suitable operation, a number of openin s or apertures of variable size are provided t erein. In the example illustrated, there are said panel to be individual openings for the rotor shaft of condenser K structure R, prongs of index 72.", the two conductors leading, res ectively, to ground or counter-capacity and the antenna or open absorption path the conductors leading to the signal-translating device, and for the cable 69. In addition, there should be provided 0 enings in the rear cabinet wall adjacen't't e end walls throu h, which a screw driver or the like may be passed for manipulating the screws 2 securing panel 3 to brackets 1. Those of the various openings or apertures aforesaid through which conductors pass may have their peripheries rounded or turned to prevent damage to the insulating or covering material of the conductors.

Thereupon by sheet of 'metal is so manipulated as to yield the cabinet, box or the like 0 illustrated in the drawings, throu h the open side of which may be passed t e frame F carryin all of the various pieces of apparatus with the possible exception of the vacuum tubes. When frame F is properly secured within the cabinet, as to the brackets 2, and with the cabinet in its normal position, that is, with the wall, c'f forming the top thereof the ledge or shelf 4 lies adjacent said wall 0 and the audio-frequency transformer T and .T ocupy inverted positions.

a suitable operation, the

-If the vacuum tubes have not (previously been secured to the plates 37 air 58, those to be secured to plate 37 may now be passed through the elongated slot b, Fig. 6, in base B, and the prongs or terminals thereof inserted through the proper groups of openings 50 or 55 and into engagement with the respective spring clips associated with each opening in said groups. In like manner, those vacuum tubes to be secured to plate 58maybe b, Fig. 7, and the terminals thereof respectively associated with the proper spring clips ad acent the openings in the various grou s 63 thereof. With this construction, it wi be observed that when the cabinet is passed through the elongated slot V in its proper positionthe vacuum tubes contained there occu y inverted depending posi tions as indicate in Fig. 7.

A metallic cabinet of the character hereinafter described presents certain advantages over the types heretofore utilized. For example, the construction thereof may be expeditiously performed with but a minimum outlay of time, labor and expense. Further, an all-metallic cabinet of this character acts as a shield and prevents absorption of undesired magnetic disturbances, such, for example, as m1 ht be taken up by one or more of the radio frequency transformers. As an instance of this character, the metallic cabinet structure tends to prevent absorption b one or more of the radio frequency trans ormers, of signal waves transmitted by a local or nearby station or screws while the set is receiving signals from a more distant station.

Referring to Fi 8, there is illustrated a modified form 0 my invention comprising a base B, which may be of material corresponding with that from which the cabinet C is formed, or otherwise, as desired. Base B may be provided with a circumferential flan e portion forming a groove or channel with which co-acts the vertical portion a" of the cabinet. By preference, base B and cabinet C are secured together in suitable manner, as by the bolts 79. There may be disposed along the bottom of base B a la er of felt or the like 6 for protecting the nish of the table or other structure upon WlllCll the set is supported. Likewise, the bottom of the base B may be provided with elongated slots or openings, as slot b, through which may be passed the vacuum tubes carried by the plates 37 and 58.

Radio receiving apparatus of the character aforesaid, particularly the circuits in which the various pieces of apparatus are connected conforms generally with the disclosure of my prior application Serial No. 79,100, filed January 4, 1926. It shall be understood, however, that an important feature of my invention resides in the provision of a one piece cabinet, preferably metallic, and articularly of the character hereinbefore escribed when utilized as a housing or en losure for any type of radio receiving apparatus which may be of a structure su stalntially different from that herein disclosed. p

What I claim is:

PP comprislng a base having an opemn in, a one-piece cabinet supported t radio receiving apparatus enclosed by said cabinet and base, and a anel secured substantiall parallel with to a wa of said cabinet forming the sole support for said apparatus, said panel havaratus of the character described, 7

there-.

ereon, jacent to the an in spaced relation ing mountings for supporting in depending position components of said apparatus including vacuum tubes inserted through said base opening.

2. Apparatus of the character described, comprising a one-piece metallic cabinet, panel structure spaced from walls of said cabinet, extending in two planes at substantially right angles to each other, and comprising a shelf terminating in a plurality of members of insulating material enclosed by said cabinet, and radio receiving apparatus dependent from both of said members.

3. In combination, a cabinet comprising a base ,having an opening therein, radio receiving apparatus enclosed by said cabinet and base, and a panel secured to a wall of said cabinet and having inverted mountings for apparatus including vacuum tubes inserted through said base opening.

4. Apparatus of the character described, comprising a one-piece metal cabinet havin an open bottom, a panel spaced from and substantially parallel with a wall of said cabinet, a shelf of insulatin material secared to said panel and space from another wall of said cabinet, and contact structure carried by said shelf to engage vacuum tubes inserted through said open bottom.

5. Apparatus of the character described, comprismv a one'piece metal cabinet having an open bottom, a panel secured to an spaced from a side wall of said cabinet, a shelf of insulating material fastened to said panel and disposed adjacent the top wall of said cabinet, and means carried by said shelf to engage and supportininverted sition vacuum tubes inserted through said open bottom.

6. Radio receiving apparatus comprising a housing having an open bottom, a anel substantially parallel to a wall of said busing and having a shelf parallel with the top of said housing and spaced therefrom, tuning structure carried by said panel, and means carried by said shelf to support in inverted position vacuum tubes inserted through said open bottom.

7. Radio receiving apparatus compris a housing having an open bottom, a pane spaced from the walls of said cabinet and extending in two planes substantially at right angles to each other and com rising a shelf, and meanscarried by said s elf to support vacuum tubes inserted through said open bottom.

8. Radio receiving apparatuscomprising a housing, a anel carried by said housin having a shelf parallelvwith and spaceda top of said housing, and means carried by said shelf to support vacuum tubes in inverted position.

9. Radio receiving apparatus, comprisi a panel having portions space adjacent the top and side walls a housin from an of said housing ture carried by respectively,

adjacent the side wall, and contact structure carried by the portion adjacent said top gagement with position.

to effect envacuum tubes in lnverted 10. Radio receiving apparatus comprising a housing having an open bottomyradio receiving apparat us enclosed by said housing,

and a panel secured substantially parallel 10 with and in spaced relation to a Wall of said cabinet forming a support for said radio receiving apparatus, said panel having mountings for supporting in depending position components of said radio receiving apll paratus including vacuum tubes inserted through said open bottom.

ARTHUR ATWATER KENT.

CERTIFICATE OF CORRECTION.

Patent No. 1,658,562. Granted February 7. 1928. to

ARTHUR ATWATER KENT.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2 line 18, for the word "vertical" read "vertically"; page 5, lines 20 and 21. for the word "rheostate" read "rheostat"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 1st day of May. A. D. 1928.

M. J. Moore,

(Seal) Acting Commissioner of Patents.

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