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  1. Recherche avancée dans les brevets
Numéro de publicationUS1244844 A
Type de publicationOctroi
Date de publication30 oct. 1917
Date de dépôt14 déc. 1915
Date de priorité14 déc. 1915
Numéro de publicationUS 1244844 A, US 1244844A, US-A-1244844, US1244844 A, US1244844A
InventeursEthan I Dodds
Cessionnaire d'origineFlannery Bolt Co
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes: USPTO, Cession USPTO, Espacenet
Spark-plug for internal-combustion engines and the like.
US 1244844 A
Résumé  disponible en
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Description  (Le texte OCR peut contenir des erreurs.)




Patented Oct. 30, 1917.




Specification of Letters Patent.

ApplieationfiledDecember 14. 1915. Serial No. 66,798.

To all whom it may concern:

Be it known that I, ETHAN I. Donns, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Spark-Plugs for Internal-Combustion Enines and the like; and I do hereby declare t e following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in spark plugs for internal combustion engines and the l1ke,-one object of the invention being to so construct a spark plug that the arc shall be intensified and its area increased.

A further object is to provide a spark plug in which the intensity and area of the arc shall be enhanced magnetically.

A further object is to so construct a spark plug that it shall be simple and eflicient and so that the terminals shall remain practically free of carbon deposit.

With these and other objects in view, the invention consists in certain novel features of construction and combinations of parts as hereinafte'r'set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in elevation of a spark plug embodying my invention. Fig. 2 is a sectional view of the same, and Figs. 3 and 4.- are sectional views showing modifications.

1 represents the shell or casing of the plug and consists of magnetic material, suc as iron. This iron shell is threaded externally to screw into the wall of the combustion chamber of the engine and at its lower or inner end, it is provided with an inwardly projecting annular flange 2 which sustains a cap 3. This cap (which is preferably made of German silver and forms one of the sparking terminals of the plug) is slotted to form a plurality of curved fingers and is held in place of insulating material. The block or disk 4 is perforated for the passage of an iron conducting rod 5 provided at its lower end with a tip 6 (which may be made of German silver) forming the other sparking terminal.

The conducting rod 5 also constitutes the core of an electro-magnet, the coil 7 of which is located within the shell 1 and rests at its by means of a block or disk 4 lower end against the insulating block or disk 4. One end of the coil 7 is electrically Patented Oct. 30, 1917. a

connected with the rod or core 5 so as. to be in the electrical circuit of the plug, and the other end of said coil is mounted in a recessed block 8 of insulating material disposed over the rod or core 5. A sleeve 9 (preferably of porcelain) enters the upper portion of the shell'l and is formed with an annular shoulder 10 to be engaged by a nut 11 screwed into the shell 1 and encircling said sleeve. A conducting rod 12 passes through the sleeve 9 and is formed at its inner end with a head or upset'portion 13 which enters a recess 14 in the inner end of the sleeve and also makes electrical contact with the exposed endof the Wire of coil 7 which rests on the insulating block 8.

The conducting rod 12 projects above or beyond'the porcelain sleeve 9 and is threaded for the reception of a clamping nut 15 which bears against .the free end of said sleeve and a nut 16 is also mounted on the rod 12 so as to cooperate therewith and with the nut 15 to form a binding post for one of the circuit terminals.

With the construction and arrangement of parts above described, a simple and efficient spark plug is formed, and the sparking terminals are so constructed and disposed as to avoid the accumulation of carbon deposit thereon.

It will alsobe observed that when the sparking circuit is closed, a magnetic field will be established as indicated in Fig. 1, the magnetic lines of force passing through the spark gap andacting to intensify the arc constituting the spark and also to extend the area of said are, thus enhancing the efliciency of the same.

Instead of employing an electro-magnet aS shown in Fig. 2, I may employa permanent magnet 17 inserted within the shell of the plug and electrically insulated from the conducting rods 12-18 as shown in Fig. 3, or I may employ a magnetized plug body 19', such as shown in Fig. 4, 'with the conducting rod 20 electrically insulated therefrom as'shown at 21.

Various other changes might be made in the details of construction of m invention without departing from the spirit thereof or limiting its scope and hence I do not wish to restrict myself to'the precise details herein set forth.

Having fully described my invention What I claim as new and desire to secure by Letters-Patent, is:

1. The combination with the sparking terminals of a spark plug, of means for setting up a magnetic field past the are formed between said terminals.

2. A spark plug provided with means for setting up magnetic lines of force past the spark gap of said plug.

3. A spark plug having electrically separated sparking terminals, said plug em bodying magnetic means disposed to establish a magnetic field having its lines of force passing through the gap between said sparking terminals.

4. A spark plug embodying in its structure, a magnet having one of its poles disposed in such proximity to the sparking terminals of the plug as to cause magnetic lines of force to be cast against the arc formed at said sparking terminals.

5. 'In a spark plug, the combination of a shell, a sparking terminal carried thereby, an electro-magnet within said shell, the core of said magnet provided with the other sparking terminal and included in circuit with said coil, and means for including said coil and core in an electric circuit and said core and shell being so correlated that mag netic lines of force will pass throu h the spark gap duringthe operation of t e de vice.

6. In a spark plug, the combination of an iron shell, a sparking terminal carried thereby, an electro-magnet within said shell and having one terminal of its coil connected with the core thereof, a sparking terminal carried by the core of said magnet, a sleeve of insulating material attached to said shell,

an insulating block disposed between said sleeve and magnet and supporting an exposed terminal of the .coil of said magnet, and a conducting rod passing through said sleeve and in electrical contact with the exposed terminal'of said coil, said core and shell being so correlated that magnetic lines of forcewill be caused to pass through the spark gap during the operation of the device.

7. In a spark plug, the combination of a shell, a sparking terminal carried thereby, a conducting rod carrying a sparking terminal, a sleeve of insulating material entering one end of the shell, a nut holding said sleeve in place, a conducting rod passing through sald sleeve and having a head at its under end electrically connected with the first mentioned conducting rod, a nut on the last-mentioned conducting rod and engaging said insulating sleeve, and a wire clamping nut on said rod.

8. In a spark plug, the combination with a shell, of a cap at the lower end thereof having a plurality of fingers constituting one side of the spark plug, an insulating block holding said cap in place, a central rod provided with a tip forming theother side of the spark gap, and means for effecting electrical connection of said rod in'a sparking circuit.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.




Référencé par
Brevet citant Date de dépôt Date de publication Déposant Titre
US3219866 *23 févr. 196223 nov. 1965Martin Marietta CorpCrossed field ignition plug system
US4161937 *3 janv. 197724 juil. 1979Gerry Martin EIgniter with magnetic activation
US5223662 *11 mai 198929 juin 1993Igenwert GmbhAccelerator
WO1981002328A1 *6 févr. 198120 août 1981G HensleyCombustion initiation system
Classification aux États-Unis313/118, 313/137, 313/140, 123/169.0PA, 313/143, 313/157
Classification coopérativeH01T13/38