US2063786A

US2063786A - Shielding device

Info

Publication number: US2063786A
Application number: US8577A
Authority: US
Inventors: John M Bowman
Original assignee: Philco Radio and Television Corp
Current assignee: Philco Radio and Television Corp
Priority date: 1935-02-27
Filing date: 1935-02-27
Publication date: 1936-12-08
Anticipated expiration: 1953-12-08

Description

Dec. 8, 1936. M BOWMAN 2,063,786

SHIELDING DEVICE Filed Feb. 27, 1935 Patented Dec. 8, 1936 John M. Bowman,

Application February 2'1,

This invention relates to electrical apparatus.

STATES PATENT OFFICE 2,063,786 SHIELDING DEVICE Philadelphia, Pa., assignor to Philco Radio & Television Corporation, Philadelphia, Pa., a corporation of Delaware 4 Claims.

shielding devices for More specifically the invention relates to shielding devices for vacuum tubes of radio receivers.

One object of the invention is to provide a device Which is which is efiicient the vacuum tube easy and economical to ture, particularly in quantity production, andin operation and serves to hold firmly, thus preventing micromanufacphonic action of the tube due to vibration.

Another object of the invention is to provide a device which may applied to a vacuum be easily manipulated and tube even though there,

may be some mismatch of the elements.

A further object of the vide a device composed of constructed so that attached together regardl thereof and which assures tact of the parts.

invention is to proa plurality of parts the parts may be properly ess of slight misfit good electrical conof the device is illustrated in drawing, wherein Fig. l is an elevational view of the lid of the device;

Fig. 2 isan elevational view of the shell;

Fig. 3 is an elevational v iew of the base;

Fig. 4 is a plan view of the base;

Fig. 5 is an elevational section of the device in cooperative relation with a vacuum tube; and

Fig. 6 is a sectional view along line 6-6 of Fig. 4.

Referring to a body or shell I,

the drawing the device comprises a lid 2, and a base 3. These parts may be made of terneplate or any other a material which is satisfactory. The body I is substantially or generally square in cross-section with rounded corners. ventional manner from a The four corners It may be made in confiat piece of material. at the bottom of the body are slightly flared outward, as at 4, and this together with the deformability of placing it on the base eve be some slight misfit. A

the body facilitates n though there may small rim 5 may be formed at the bottom of the body to stiffen it and make it fit tightly over the base.

Preferably, there are small centrally located holes 6 in the sides of the body to provide venin place, as shown at I in cross-sectional area of the the tube fits snugly therein tion of the glass envelope Figs. 5 and 6. The body I is such that with the widest por- 8 of the tube seated 1935, Serial No. 8,577

in the openings of thebody, as shown in Fig. 6. This serves to hold the tube securely and prevents vibration or rattling of the same with its consequent microphonic action. Due to the deformability of the body permitted by its square cross-sectional form, it adjusts itself to the tube when necessary thereby assuring the desired tight fit.

The body I may be provided with a recess or slot 9 to allow entrance of a conductor attached to the grid terminal at the top of the tube. A small ridge Il may be indented around the top of the body to hold the lid or cover firmly in place. The top edge of the body is preferably turned over, as at H to eliminate sharp exposed edges. The lid 2 may be formed of extruded terneplate and is adapted to fit snugly over the top of the body I. It is not essential, however, that a lid be used.

The base 3 may also be extruded from terneplate. This member is of the same contour as the body and is adapted to fit snugly inside the lower part of the body, as shown in Fig. 5. The base is provided with rounded corners and has diagonally opposite corner indentations l3 to provide apertured mounting ears M. These, corner indentations also provide space which allows for mismatch between the body and base. The large aperture l of the base is adapted tov receive the base I6 of the vacuum tube. The rim formed by the hole IS in the base serves to stiffen the base and thus hold the shell I in place. This tight fit also provides good electrical contact between the shell and the base, thus assuring that the metal shell will act as an effective electrical shield.

Various changes or modifications are of course possible and are to be deemed within the scope of the invention.

I claim:

1. A shielding device for electrical apparatus, such as vacuum tubes, comprising a relatively rigid metallic base of non-circular cross-section having corner indentations, and a body or shell of similar cross-section adapted to fit over said base and formed of deformable metallic material, so that said shell fits snugly over the apparatus with which it is used and also fits snugly over said. base notwithstanding slight misfit of the said elements, said indentations providing space which permits greater deformability of said shell in fitting over said base.

2. A shielding device for electrical apparatus, such as vacuum tubes, comprising a relatively rigid metallic base of non-circular cross-section having opposed corner indentations and means at said indentations for mounting said base, and a body or shell of similar cross-section adapted to fit over said base and formed of deformable metallic material, so that said shell fits snugly over the apparatus with which it is used and also fits snugly over said base notwithstanding slight misfit of the said elements, said indentations providing space which permits greater deformability of said shell in fitting over said base.

3. A shielding device for electrical apparatus, such as vacuum tubes, comprising a relatively rigid metallic base of generally square cross-section having rounded corners with opposed corner indentations and means at said indentations for mounting said base, and a body or shell of similar cross-section having rounded and flared corners, adapted to fit over said base and formed of deformable metallic material, so that said shell fits snugly over the apparatus with which it is used and also fits snugly over said base notwithstanding slight misfit of the said elements, said indentations providing space which permits greater deformability of said shell in fitting over said base.

4. A shielding device for a vacuum tube, comprising a relatively rigid metallic base of generally square cross-section and having an opening for reception of the tube base, said base having opposed corner indentations and means at said indentations for mounting said base, and a metallic shell of similar cross-section deformable throughout its length and adapted to fit over said base and having openings in its sides to seat the widest portion of the tube, so that said shell fits snugly over the tube and also fits snugly over said base notwithstanding slight misfit of the said elements, said indentations providing space which permits greater deformability of said shell in fitting over said base.

JOHN M. BOWMAN.