US2046927A - Radio chassis - Google Patents

Description

July 7, 1936. r JFFULEY 2,046,927

RADIO CHASSIS Filed July 25, 1955 4 Sheets-Sheet l RADIO CHASSIS Filed July 25, 1955 4- Sheets-Sheet 2 J ly 7, 193 J. F. RILEY 2,046,927

RADIO CHASSIS Filed July 25, 1935 4 Sheets-Sheet 5 J. F. RILEY RADIO CHASSIS July 7, 1936.

Filed July 25, 1955 4 Sheets-Sheet 4 Patented July 7, 1936 UNITED STATES PATENT OFFICE RADIO CHASSIS Joseph F. Riley, Chicago, Ill., assignor to Howard Radio Company, Chicago, 111., a corporation of Illinois This invention relates to a chassis for a radio set and, more particularly, to a chassis formed from a single sheet of metal.

One feature of this invention is that the chassis may be simply and easily constructed; an-

other feature of this invention is that the chassis shields the tubes from the other parts of the set; still another feature is that the tubes are readily accessible for replacement; yet another feature is that the entire set is self-contained with respect to the chassis; other features and advantages of this invention will be apparent from the following specification and the drawings, in which 15 Figure 1 is a front elevation of a set embodying this invention; Fig. 2 is a top view of the set; Fig. 3 is a rear elevation; Fig. 4 is a bottom view, showing the arrangement of parts; Fig. 5 is a vertical elevation of the right end of the set;

20 Fig. 6 is a vertical elevation of the left end of the set; and Figs. 7 and 8 are perspective views of the principal supporting member of the chassis.

While chassis for radio receiving sets have 25 heretofore been made of metal, such chassis, however, have generally comprised a lower frame or bed, either with or without a metal front panel. Such a chassis does not provide a housing for the parts of the set, nor does it .30 shield the tubes from such parts or apparatus as are placed on the upper surface of the frame. It has been customary to provide separate metal boxes or cans to shield various parts of the set from each other and from the tubes. The chassis 35 disclosed herein provides what is substantially a housing for all of the apparatus which goes to make up a modern multi-tube receiver, with the exception that an offset portion in the rear of the housing or chassis provides a shelf adapted 40 to support the tubes. The tubes are thus electrically and mechanically separated from the rest of the set, yet supported in such a position as to be readily accessible from the rear of the cabinet in which the chassis may be placed.

:45 With the exception of the tubes and dial, all of. the parts for the set are housed within the chassis and depending therefrom, whereby a compact, convenient, and electrically efficient construction is attained.

150 The principal part of thechassls isprobably best shown in Figs. 7 and 8. As hereshown, there is provided a piece of sheet metal bent in the form of an inverted U with an offset or shelf at the back. This member is preferably lid formed of a single piece of sheet metal which is first suitably perforated, as shown, to assist in mounting the apparatus, tube sockets and parts thereon. This sheet metal U-shaped member forms the principal part of the chassis. As shown in the drawings, it has a perpendicular 6 front wall ll provided with a comparatively large opening i2 through the center for the loudspeaker. 24 represents the top wall, 25 the back wall and 26, the offset or shelf. This shelf is provided with four apertures adapted to 10 receive the tube sockets for a four tube set. It

is obvious that if a different number of tubes is used, there will be a different number of holes for the sockets.

It is to be understood that no claim is made to any particular circuit or hook-up and, consequently, no attempt has been made to show the circuit or wiring details. The invention relates only to the mechanical construction and principally to the employment of the U-shaped sheet metal member shown in Figs. 7 and 8. This member is preferably perforated before bending and then bent into the shape shown. It may i be stiff enough so that the bottom braces 30 need not be employed. As shown in this case, however, such braces are indicated to give extra strength and rigidity. In Figs. 7 and 8, no attempt has been made to show the correct size, number or spacing of the apertures. These naturally must be made and provided to suit the particular apparatus employed. In general, it may be stated that Figs. 7 and 8 really show the invention. That is, they show the complete chassis stripped of all the condensers, coils, tube sockets, resistors, wiring and other parts neces sary to make up a complete radio receiver chassis.

In the particular embodiment of this invention illustrated herewith, the chassis in general is indicated by the reference numeral Ill. The chassis has a substantially perpendicular side or front wall I l forming a panel for the receiver, this panel having a comparatively large opening l2 substantially through the center thereof. The opening I2 is adapted to permit the sound waves generated by the cone I3 of the loud speaker l4 to be directed out into the room or other place where the set may be used. Since the cone I3 is mounted directly on the panel II, as by the bolts I5, the panel ll serves as a baffle for the sound waves generated by movement of the cone and prevents them short circuiting from the front of the cone to the rear portion thereof. The panel I I also has mounted thereon, in this embodiment directly in front of the loud speaker opening, a dial comprising a face [6 and an indicator ll. The face is here shown as indirectly illuminated by the two lights 22 and 23. The indicator is yieldingly driven by a cord l8 running around the condenser shaft or main tuning shaft [9. The set is also provided with a shaft which controls the snap switch and volume control 2i. These two shafts l9 and 20 project through the panel H and provide the controls for the receiver.

Referring more particularly to Fig. 6, wherein a vertical elevation of one end of the set is shown, it will be readily apparent that the chassis It] comprises, in addition to the wall or panel I I, a top 24, another side or rear wall 25, and an exteriorly offset portion 25 forming a horizontal shelf adapted to support the tubes. An end or cross-sectional view of the chassis is thus analogous to an inverted U, the front and rear walls being the legs thereof, with an exteriorly ofiset portion on one side or leg forming the shelf. This view shows the loud speaker M, the filter condenser 2?, the combined snap switch and volume control 2|, the socket 28 for the tube 39, and miscellaneous wiring and other parts, all contained within the chassis Hi. It is thus .apparent that these parts and the wiring therefor are both mechanically and electrically separated from the tubes and from any external bodycapacity, by the rear wall 25 and the panel II. In order to provide structural rigidity, the lower portion of the U has extending thereacross a bracing member 30.

Referring more particularly to Fig. 5, a vertical elevation of the other .end of the set, the

main tuning .condenser 3! may be seen driven by the shaft id. The position of one of the radio frequency transformers 32 is also shown. One of the radio frequency tubes 33 is here shown surrounded by a metal can or shield 34 having a cover or cap 35. This view also illustrates the fact that .the parts of the set are mounted within the chassis and depending therefrom and the tubes are mounted on the outside of the chassis on the shelf formed by the exteriorly offset portion on the rear wall or side of the inverted U.

Referring more particularly to Figs. 3 and 4, the order of arrangement of the tubes is shown. Tubes 33 and 36 are radio frequency tubes, preferably containing five elements or more, the par-.- ticular tubes disclosed herein containing six elements. The tube 317 is an audiofrequency tube here shown as a type 43, and the tube 29 is a rectifier, here shown as a type 2525, since it is desired that the set be universally operable from either A. C. or D. C. Figure 4 shows the other radio frequency transformer 38, and illustrates the compact arrangement of the various parts and the consequent desirable shortness of the connecting leads.

The chassis is preferably formed of a single piece of sheet metal, stamped into the desired substantially U-shape, with the offset shelf for the tubes. The sheet may have the various necessary openings punched through it before it is formed into the finished shape or substantially at the same time as that operation is performed. The parts may be easily placed within the chassis and wired as the manufacturing. pro- .ceeds. Since all of the parts are mounted .directly within and depending from the chassis, and since the chassis is rendered rigid by. the bracing members 30, the set may be placed vin a cabinet of the desired type with no further .con-

- that it nections or wiring to be made thereafter. Since the shelf adapted to receive the tubes is to the rear and adapted to support the tubes outside of the chassis housing, the tubes may be easily inserted after the set is in the cabinet. Should any repair work or servicing be necessary on a set of this type, the entire chassis can be removed from the cabinet without the necessity of unsoldering leads to volume controls, snap switches, and the like.

While I have shown and described certain embodiments of my invention, it is to be understood is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as permissible, in view of the prior art.

What I claim as new, and desire to secure by Letters Patent, is:

1. A chassis for a radio receiver, comprising: an integral stamping of sheet metal forming front and rear walls and a top, said stamping being adapted to house substantially all the parts of said receiver, with the exception of the tubes, and support them within said housing, said front wall being apertured to permit the speaker to be directed therethrough and the control shafts for said receiver to project therethrough, said rear Wall having an exteriorly offset portion near the bottom thereof forming a shelf adapted to support tube sockets, whereby the tubes .of said receiver are separated from the parts of saidreceiver .by said rear wall.

2. A chassis for a radio receiver, comprising: an integral stamping of sheet metal forming front and rear walls and a top, said stamping being adapted to house substantially .all the parts of said receiver, with the exception of the. tubes and support them within said housing, said front wall being apertured to permit the speaker to be directed therethrough and the control shafts for said receiver to project there- .through, said rear wall having an exteriorly .oifset portion near the bottom thereof forming a shelf adapted to support tube sockets, whereby the tubes .of said receiver are separated from the parts of said receiver by said rear wall; and a bracing member connecting said front and rear walls at a point removed from said top.

3. A chassis for a radio receiver, including: a sheet .of metal shaped substantially as an inverted U, one. of the legs thereof having an opening therethrough adapted to permit a speaker to be mounted within said U and directed through said opening, the other of said legs having an exteriorly offset portion forming a shelf adapted to support a tube without said U, whereby said last-mentioned leg separates said tube from electrical apparatus located within said U.

4. A chassis for a radio receiver, said chassis having substantially the shape of an inverted U, and including: a front wall having an opening therethrough adapted to permit a speaker to be .mounted within said U and directed through saidopening, whereby said wall forms a baflle for said speaker and a panel for said'r'adio receiver;

top and a rear wall having an exteriorly offset portion forming a shelf adapted to support a tubewithoutsa d .u. w re y a l t-mp tioned wall separates said tube from electrical apparatus located within said chassis.

5. In radio receiving apparatus, a chassis, including; a single piece of sheet metal bent in the shape of an inverted U with an opening in the front leg and an exteriorly ofiset portion forming a shelf on the rear leg; a speaker inside of the U facing the hole therein; and tube sockets carried by said shelf, said sockets being adapted to support tubes above the shelf and without the rear leg of said U.

JOSEPH F. RILEY.

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