US1940997A - Aerial connecter for radio apparatus - Google Patents

Description

Dec. 26, 1933. c. DAKAN 1,940,997

AERIAL CONNECTER FOR RADIO APPARATUS Filed Nov. 19. 1931 INVENTOR.

(ar/ Da /(cm Patented Dec. 26, 1933 Q UNITED STATES PATIENT; omen: I

7 Claim sh (o1; 259-20) This invention relates to a ground and aerial connecter for radio receiving sets, and more particularly to a device mounted in the cabinet of such a set which eliminates the usual groun connection entirely.

It is customary in radio receiving sets to have a ground wire which is connected to a water pipe or some other conductor extending ,into the ground and, in consequencathe'set is aifected by electrical. disturbances resulting from electric conductors in underground conduits, electric railway rails which serve as conductors, and static conditions existing in the ground and which I believe affect the operation of a radio set just as much as static and other electrical disturbance entering by way of the aerial.

The. use of my device eliminates the usual ground entirely and, consequently, all disturbancesarising from such connection, and I have also found that by passingthe waves received by the aerial through this device that strayfrequencies and electrical disturbances are trapped anddiverted'so that they are not amplified in the set. 3 The 'tonereproduced is, therefore, clarified as much of the aerial disturbance is thereby removed. 1 A In'addition to this, I have found that by the use of my device the'life of a' tube in the set is greatly increased, which I believe is due tothe fact that the shock imparted to the delicate filaments of the tubes is practically eliminated.

In accomplishing these and other objects of 1 my invention, I have provided improved details showing the interior thereof of structure, the preferred form of which is illus-. trated in the accompanying drawing, wherein:

- Fig. 1 is a perspective view of a radio cabinet with my device in position; V 1 1 Fig. 2 is an enlarged side elevation of my device. 7

Fig. 3 is a cross section taken. on the line 3-3 of Fig. 2.

Fig. 4 is a vertical longitudinal section of the *to the nippleB. v v

The device may be secured at any convenient point in the radio cabinet .by a supporting means [parting from the spirit of my invention.

which is preferably made of a pair of street Us or arcuate members 6 and 7 united by a screw threaded nipple 8. One of the Ls, as for instance th'e l. 7, is providedwith an opening 9 which is closed by means of a plug 10, the purpose of which'will be described later. Secured .to the free ends of the Ls 6 and '7 are the legs 11 of Ts 12. These :Ts are so arranged that the openings through their-heads will be in longitudinal axial alignment. Carriedby, the Ts and extending across the space between the adjacent, endsof their heads is a tube 13 preferably formed of glass, although other suitable insulating material may be used.

Surrounding the tube 13 are resilient gaskets. 14

which are forced into the ends of the Ts,'-thereby firmly holding the tube in place and at, the

same time forming a leak-proof joint andiconnecting the open endof the U.

Fitting'snugly into the outer ends of the heads ,of the Ts l2 are'plugs 15 formed of insulating 'materiaI.

7 These plugs may be a snug or'drive fit as shown, or they may'be screwed in if desired. The plugs are provided with a, flange 16 which 9 serves asaseat for a'gasket 1'7 interposed be- 0 tween thefiange- 16-and theend of a T, 12, so as tomake a l ak-proof joint.* The plugs 15 are provided with a central opening through which screw threaded studs or. rods 18 extend. The inner endsoi these studs are secured to the ends 28 of a tubular hermetically sealed cylindrical memberor float 19, which is of, less diameter than the tube 13 and extends longitudinally and con- 'centrically therein, and, withthe studs, constitutes' an electrical conductor. Thumb nuts 20,

which; maybe of any desired type, are threaded on the projecting ends of the studs 18 and, together with the washer 21, serve to secure an electrical conductor to a stud. v I

The studs 18 arealsosealed in-the plugs 15 sothat there can be no leakage at this point.

A clamp 22 oi'jany suitable construction, such as is usually employed for securing theordinary ground wireor' leadto a water pipe, issecured 23 such as a spring. clamp or the like, and, if space .in the cabinet is not available, it may be secured at any convenient place near the receiving set.

, While Ihave described the U-shaped member as being made, up of standard pipe fittings, I do not desireto limit myself thereto as this member may be made as-an integral casting withoutde After the various parts of my device have been assembled and care has been taken to render all joints leak-proof, the plug 10 is removed and a body of pale parafiine 24, now principally a waste by-product and which never solidifies, is poured through the opening 9 so as. to completely fill the interior of the U-shaped member and entirely surround the cylindrical member or float 19 and that portion of the studs 18 which are between the ends of this member and the plugs 15, and, as this pale parafiine is an insulator, it will be readily seen that no electrical connection exists between the member 19 and its studs 18 and the -U-shaped member 5.

After the device has been thus completed it is placed in position and one end of a conductor 25 attached to a stud 18 by means of the thumb nut 20. Its opposite end is then attached to the aerial binding post of the receiving set chassis. A conductor 26 has one end attached to the remaining stud 18 in the same manner and .its opposite end connected to the aerial} in fact, the conductor 26 may be termed the aerial lead in, A conductor 27 has one end secured to the clamp 22 and its other end is secured to the ground terminal 4 of the chassis.

From the foregoing it will be seen that all reception passing from the aerial to the receiving set must pass through the liquid insulator in the U-shaped member, which neutralizes to a great extent electrical disturbances gathered from the air.

I do not desire to limit myself to the use of pale parafline as the liquid insulator in my device, as otherliquids or combination of liquids having insulating properties may be employed with-. out departing from the spirit of my invention.

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

1. A device of the character described comprising a hollow U-shaped member, a tube of insulating material connecting the open ends of said U-shaped member together, an insulating liquid in said member and tube, and an electrical conductor carried by and insulated from said Ushaped member, said'conductor extending longitudinally'of said tube and through the insulating' liquid.

2. A device of the character described comprising a hollow U-shaped conducting member having T-shaped heads, a tubular insulating member carried by said heads and extending therebetween, insulating plugs for closing the outer ends of said heads, an electric conductor carried by said plugs and extending through said tubular member, and a liquid insulator located in said U-shaped member and tube.

3. A device of the character described comprising a pair of hollow arcuate members, a hollow connection between selected ends of said members, thereby forming a U-shaped member, T-shaped heads carried by the opposite endsoi said members, a hollow tubular insulating member carried by and extending between adjacent ends of said heads, insulating heads located in the opposite ends of said heads, an electric conductor extending through said insulating heads and said tubular member, and a liquid insulator located in said U-shaped and tubular insulating members.

4. A device of the character described comprising a hollow substantially arcuate electrically conductive member, a tubular member formed of insulating material connecting the ends of said arcuate member, the interiors of said members communicating with each other, insulating plugs for sealing the ends of said arcuate member, an insulating liquid filling said arcuate and tubular members, and an electric conductor carried by said plugs and extending through said tubular member.

5. A device of the class described comprising a hollow U-shaped metallic member, a T-shaped head secured to each end of said member, a tubular insulating member carried by said heads and having its ends located in adjacent ends of said heads, an insulated plug for closing the opposite end of each head, an electric conductor extending through said plugs and tubular insulating member, and a liquid insulator in said U-shaped member and tubular insulating memher.

6. A device of the character described comprising a pair of metallic elbows, a metallic nipple for secur ng said elbows together, a metallic T secured to each of said elbows, the openings in the heads of Ts being in longitudinal alignment, a tubular member formed of insulating material extending between and into said We, an insulating plug for closing the open end of each of said Ts, a hollow hermetically sealed conductor of less diameter than said tubular member extending concentrically therethrough, studs carriedby said hollow conductor and extending through said plugs, means for attaching electric conductors to said studs, means for connecting an electric conductor to said nipple, and a body of liquid insulating material located in the interior of said elbows, nipple, Ts and tubular member.

7. A device of the character described comprising a tubular U-shaped member having a filling opening, hollow open end T-shaped heads carried by the ends of said U-shaped member and arran ed in longitudinal axial alignment with each other, a tubular member formed of insulating material located between and extending into the adjacent ends of said heads, a plug of insulating material located in the opposite end of each head, a hollow hermetically sealed conductor of less diameter than said last mentioned tubular member extending through and concentric with said member, studs carried by the ends of said conductor and extending through said plugs, and a body of liquid insulating material completely filling said U-shaped member, heads and hollow insulating member.

CARL DAKAN.

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