US1960579A

US1960579A - Electrical apparatus

Info

Publication number: US1960579A
Application number: US503430A
Authority: US
Inventors: Fred M Edwards
Original assignee: Grigsby Grunow Co
Current assignee: Grigsby Grunow Co
Priority date: 1930-12-19
Filing date: 1930-12-19
Publication date: 1934-05-29
Anticipated expiration: 1951-05-29

Description

May 29, 1934- F. M. EDWARDS 1,960,579

ELECTRICAL APPARATUS Filed Dec 19, 1930 2 Sheets-Sheet 1 l 'f III-MM mimi" INVENTOR May 29, 1934. M EDWARDS 1,960,579

ELECTRICAL APPARATUS Filed DeC. 19. 1950 2 Sheets-Sheet 2 INVENTOR 5F50 M52 vnf/7F05.

ATTO Y Patented May 29, 1934 UTED STATES ELECTRICAL APPARATUS'y Fred M. Edwards, Oak Park, Ill., assigner to" Grigsby-Grunow Company, Chicago, Ill., a corporation of Illinois; Frank M. McKey, receiver in bankruptcy Application December 19, 1930, Seriall No. 503,430

7 Claims.

This invention relates to electrical apparatus and particularly to radio receiving sets. In the manufacture of such sets, it is highly advantageous to have a structure which will be compact, sturdy and be capable of withstanding the abuse incidental to assembly during manufacture.

An object of this invention is to devise a structure of the above character which will satisfy the above requirements.

In the drawings, Figure 1 is a perspective View from the front of a radio chassis embodying this invention.

Figure 2 is a similar View from the rear of the chassis.

Figure 3 is a perspective view of a sub-assembly formers.

Figure 4 is a perspective view of the assembly of Figure 3 in inverted position.

Figure 5 is a perspective View of the audio frequency tube mounting.

Figures 6 and 7 show the cover and gang condenser respectively.

'Ihe chassis comprises a base member 1 of sheet metal having up-turned triangular flanges 2 and 3 at each side thereof. Dividing base member 1 at the longitudinal center line is a vertical partition 4 having similarly projecting sides 5 and 6 and forming a generally U shaped structure. As shown in Figures 1 and 2, sides 5 and 6'of partition 4 engage upstanding flanges 2 and 3 of base member 1 and are bolted together at 7.

The entire radio frequency and audio frequency parts of a complete radio receiver including a power supply are mounted on both sides of partition 4. Looking from the front of the chassis, as in Figure 1', a gang condenser, generally designated as 10, of well-known construction is mounted on partition 4 approximately centrally disposed with respect to the sides of the chassis. A protecting cover 11 is provided for gang condenser 10. At one end of gang condenser 10, there is disposed an operating assembly therefor comprising a projecting shaft 12, suitablyY connected to the shaft of gang condenser 10. This mechanism, which is well known, includes an indicating dial 13 for showing the position of the condenser gang.

Disposed on the opposite side of partition 4 is the remaining portion of the radio frequency elements shown in Figures 3 and 4 and generally designated as 15. It will be noted that subassembly 15 comprises a generally rectangular sheet metal member 16, having one downwardly bent side wall 17 and an end member 18 projecting (Cl. `Z50-44) on both sides of member 16. Suitably mounted on member 16 are a plurality of vacuum tube sockets 2O for radio frequency or, if a superheterodyne circuit is used, intermediate frequency amplifiers. Below tube sockets 20 and on the inside of wall 17 may be disposed small fixed condensers, such as 21 radio frequency chokes from the power supply or any similar elements which are to be connected in the tubel circuits. Tube sockets 20 are adapated to support tube shields 22, covering vacuum tubes 23. Bolted to sheet member 16` is a rectangular box-shaped member 25 within which may be disposed various radio frequency transformers necessary for the proper operation of the set. In this instance, a superheterodyne circuit is used and the intermediate frequency transformers are housed within box 25. Adjacent to box 25 and in line therewith on member 16 may be mounted additional apparatus 26 and 27 comprising such radio frequency transformers as must be disposed in close proximity to certain particular tubes or condensers. Thus, in this instance, within dome-shaped metal member 26 is mounted the inductance units of an oscillator, the capacity of which is furnished by one of the gang condensers. Member 27 may be one of the radio frequency transformers ahead of the first detector.

It will be noted that the various edges of the units are suitably flanged and apertured so that they may be'bolted in their respective positions. Since gang condenser 10 is disposed in close proximity to the remaining high frequency apparatus on the other side of partition 4, it is evident that an efficient and compact arrangement of the high frequency elements is possible. Various shielding plates and members may be disposed to protect the elements from each other. It will be noted that the assembly generally designated as 15, in Figures 3 and 4, is a compact, selfcontained unit which may be assembled' separately and then incorporated on the chassis.

Disposed between side 6 and assembly 15 isa power transformer 30 adapted to transform alternating current from the lighting circuit into currents at Various voltages for supplying the necessities of the various amplifiers. Disposed on the other side of partition 4 is a can 31 containing a plurality of chokes for filtering the plate supply current from transformer 30. On the same side of partition 4, but on the other side of the chassis is a can 32 containing the condensers for the filter circuit. Disposed above

cans

31 and 32 on partition 4 are'cans 33'and 34 containing audio frequency transformers.

. condenser,

On the other side of partition fi, above transformer 30, there is bolted to the partition a metallic rectangular can containing a plurality of tube sockets 36 for the rectiiier and audio frequency tubes. Within this can may be disposed bias resistors and other small elements associated with audio frequency ampliers. A suitable cover plate 40 is bolted to the open side of said can and serves to give ready access to the wiring of the audio frequency amplifier.

The output of the audio ampliners may be fed to any type of loud speaker, which is here shown as mounted at the upper central portion of partition 4.

It will be noted that the heavy pieces of apparatus, such as power transformer, inductances, filter condensers and audio frequency transformers are mounted in such a way so that the chassis is mechanically balanced. In addition, the radio frequency elements of the set are closely adjacent each other to reduce losses. By making base 1 and partition 4 of heavy metal, it is possible to obtain a chassis which has compactness and sturdiness combined to an unusual degree.

It is, of course, possible, to re-arrange certain of the elements, particularly the audio frequency elements without departing from the spirit of this invention. Furthermore, certain radio frequency elements, such as input coils, may be disposed wherever convenient. Where the term radio frequency elements is used, it is understood that intermediate frequency apparatus of a superheterodyne circuit is to be included.

. What I claim is:

1. A complete radio receiving set chassis comprising a metallic base member, a metallic vertical partition member dividing said base vmember into substantially equal portions and rigidly secured thereto a gang condenser mounted on one side of said partition member, substantially all of the remaining radio frequency elements mounted on the other side of said partition member in close proximity to said condenser, audio frequency and power supply elements secured to said base member and partition on both sides of Ysaid partition, and a loud speaker mounted on said vertical partition at the upper central portion thereof.

2. A radio receiving set chassis comprising a metallic horizontal base member, a metallic vertical partition member dividing said base member into substantially equal portions, a gang condenser secured to said partition member on one side thereof, substantially all remaining radio frequency elements secured on the other side of said partition and in close proximity to said gang audio frequency transformers and power supply elements disposed at each end of said gang condenser on the same side of the partition member in balanced relation, remaining audio frequency and power supply elements mounted on the other side of said partition member from the gang condenser, and a loud speaker mounted on said vertical partition at the central upper portion thereof.

3. A radio receiving set chassis comprising a metallic ybase member, a metallic partition member rising vertically from said base member rigidly secured thereto and dividing said base member into substantially equal portions, a gang condenser secured to an intermediate portion of said partition member, audio frequency transformers and lter elements of the power supply circuitsecured to said partition member on the same side as said gang condenser, additional radio frequency elements including tube mountings secured to said partition member on the side remote from said gang condenser and in close proximity to the latter, and additional audio frequency and power supply elements including tube mountings secured on the same side of said partition member said partition member having its ends extended and bent at right angles along the sides of said base on the same side of said partition, and enclosing the apparatus on one side of said partition.

A radio receiving set chassis comprising a metallic base member, a metallic vertical partition member rigidly secured thereto and dividing said base member into substantially equal portions, a gang condenser secured to said partition member substantially midway between the sides of said partition, audio frequency transformers and choke and condenser elements of the power supply filter circuit secured to saidpartition member on the same side thereof and at each end of said gang condenser, additional radio Vfrequency elements including tube sockets mounted on the other side of said partition member in close proximity tosaid gang condenser, additional audio frequency elements including tube sockets, power supply elements mounted on the last named side of said partition member and a loud' speaker mounted at the central upper portion of said partition member.

5. A radio receiving Vset chassis comprising a metallic base member, a metallic vertical partition member rigidly secured thereto and dividing said base member into substantially equal portions, a gang condenser secured to said partition member substantially midway between the sides thereof and at the lower portion, audio frequency transformers and power supply lter elements secured to said partition at the ends thereof and on the same side as the condenser, a loud speaker secured to said partition at the upper central portion thereof above said condenser and on the same side thereof, and remaining radio frequency, audio frequency and power supply elements including tube sockets mounted on the other side of said partition said partition member having its ends extended and bent at right angles thereto along the sides of said base on the side of said partition where the tube sockets are mounted, and enclosing the apparatus on that side of the partition.

6. A radio receiving set chassis comprising a metallic base member, a vertical metallic partition member rigidlylsecured to said base member and dividing said member into substantially equal portions, a gang condenser mounted to the lower central portion of said partition, choke and inductance elements of a power iilter circuit mounted to said partition on each side of said condenser, a loud speaker mounted to said partition above said condenser, audio frequency transformers mounted on said partition on each side of said speaker, substantially all remaining radio frequency elements mounted on the other side of said partition and in close proximity to said gang condenser, and the remaining elements of the set including tube sockets mounted on said other side of said partition.

7. A radio receiving set chassis comprising a metallic base member having upstanding sides, a vertical metallic partition member rigidly secured to said upstanding sides and dividing said base member into substantially equal portions, a gang condenser mounted on the lower central portion of said partition, choke and condenser elements of a power suppIy filtering circuit mounted to said partition on each side of said condenser, a loud speaker mounted on said partition above said condenser, audio frequency transformers mounted to said partition on each side of said speaker, a power supply transformer mounted on the other side of said partition, an audio frequency tube assembly mounted on said other side of the partition above said power transformer and remain-