US1857069A - Static eliminator tube - Google Patents

Description

May 3, 1932. E. TEEL I STATIC ELIMINATOR TUBE Filed Jan. 6. 1930 m n W Far! 728 2 to the tops of large posts 34 and 35.

Patented May 3, 1932 UNITED STATES PATENT OFFICE EARL TEEL, OF NORMAN, OKLAHOMA, ASSIGNOR OF ONE-HALF T F. B. BWANK, 0F NORMAN, OKLAHOMA STATIC ELIMINATOR TUBE Application filed January 6, 1930. Serial No. 418,915.

This invention relates to radio tubes and the object is to provide a tube which will reduce or eliminate static.

Referring to the accompanying drawings, which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is and Figure 2 is a conventional diagrammatic viiw showing the filament and the coils in the tu e.

In the drawings numeral indicates a cap of suitable insulating material forming a top for the tube and in which a glass bulb or envelope 11 is suitably sealed and numeral 12 indicates a base for the glass bulb, this base being of suitable insulating material likea view in elevation of the tube,

Wise and being somewhat larger than the cap 2o 10. The cap 10 has binding posts 13 and 14. The binding post 14 will have connected to it the outside antenna of the radio and to the binding post 13 is attached an antenna which leads to the antenna post on a radio 5 set. Fiber posts 15 and 16 are mounted upon osts 17 and 18 which are mounted in a glass ase support 19. Similar fiber posts 20 and 21 are mounted upon brackets 22 and 23. A wire 24 is connected to the binding post-14 and to a fine wire 25 which is wound around the posts 15 and 16 to provide a number of turns and is secured atits lower end to a wire 26 which passes down through the base 12 of the plug and is secured at its lower 1 end to a post 27 A wire 28 is connected to the binding post 13 within the tube and is attached to a fine wire 37 which is wound around fiber posts 20 and 21 and is secured at its end to a wire 29 which in turn is secured at its lower end to a post 30. Posts27 and 30 are small posts which are made to fit corresponding sockets on the radio. A filament 31 is attached at its lower ends towires 32 and 33 which are secured at their lower erijlfis e filament 31 may be looped over a hook 36 secured to the under side of the cap 10. The filament 31 may be heated by any .smtable current in the usual way.

The filament 31 may be any suitable mateondary, increasing as .By this method the electrical impulses coming rial, preferably tungsten with a coating of barium, strontium, or thorium oxide and. should be made in different voltages and amperages so that it may be adapted to all makes 0? radios.

The theory of operation of my invention is as follows: It is now generall accepted that all substances are made 0 electrons which themsleves are negative particles of electricity. In a piece of metal, for example,

these negative particles move about in 21gzag paths in all directions at very high velocities. The velocity, however, is dependent on the temperature of the metal, increasing with an increase of temperature. If the metal is heated very hot the electrons attain enormously high velocities sufiicient to fly oif from the surface in a manner somewhat analogous to the escape of steam from the surface of water when it is boiled. The heated filament of a vacuum tube, of course, becomes a source of electrons. The plate of the tube is charged with positive electricity. Unlike charges of electricity attract each other so the positive charges cause the negative electrons to flow to the positive on the plate. The electrical impulses that are coming in are those put out by the broadcasting station and energize the primary coil of the tube. The primary coil is connected to the aerial and is grounded to the outside. The secondary coil of the tube is connected at one end to the aerial of the radio and at the other to the ground posts of theradio set. The secondary coil of the tube has no charge of electricity. When the filament of the tube is heated the negative electrons are permittted to pass to the positive charge thus making a flow of current from the primary to the secthe filament is heated.

in from the broadcasting station are inductively transmitted from the primary to the secondary windings with practically no loss whatever, and pass into the receiver to be transformed into sound. Now the outside aerial is in some respects a condenser, i. e., it allows static electricity to collect and when loaded to capacity it discharges in surges into the ground. The longer the aerial the greater the capacity and the greater the surges. The only other way this passage is made is through the receivin set. These surges are detected and ampli ed as are the impulses from the broadcasting station and are brought out in the loud speaker in the form of objectionable noises which are termed static, but by using the primary winding of the tube as conductor from the aerial and grounding it to the outside the static discharges that accumulate on the aerial will follow the line of least resistance to the ground, that line being direct through the primary winding of the coil. As the signals from the broadcasting station are received and brought in by the aerial to the primary winding of the coil the negative electrons flowing from the filament of the tube to the primary coil are a medium by which the impulses of the broadcasting station are brought over and caused to flow at a constant rate into the secondary coil and into the receiving set. As the static surges discharge they pass at such a high velocity that it is easy for them to reach the ground by the direct connection of the primary coil, they hence do not affect the incoming signal. v

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawings and described in the specification but only as indicated in the appended claim.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

An electric discharge tube comprising an envelope terminating in a re-entrant support at one end thereof, electrodes mounted on said support in said envelope and having leads passing through said support, a base having terminals fixed to said envelope adjacent said support, a cap having terminals fixed to the opposite endof said envelope, each of two of said electrodes constituting a wound coil inductively coupled to the other, another of said electrodes constituting a filamentary cathode having leads connected to the terminals of said base, one end of each of said wound electrodes being connected to a terminal in said base and the other end of each of said wound electrodes being connected to a terminal in said cap. v

In witness whereof, I have hereunto set my hand at Norman, Oklahoma, this second day of January, A. D. nineteen hundred and thirty.

EARL TEEL.

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