US952692A - Spark-coil. - Google Patents

Description

U. H. THORDARSON.

SPARK COIL.

APPLICATION FILED NOV.17,190B.

952,692. Patented Mar. 22, 1910.

ldjz'zeziisfs Z Inventor PATENT OFFICE.

CHESTER H. THORDARSON, OF CHICAGO, ILLINOIS.

SPARK-COIL.

Specification of Letters Patent.

.laftontod Mar. I910.

Application filed November 17, 1908. Serial No. 463,054.

To all whom it may concern:

Be it known that I, Cuus'rnn H. 'luonmnson, a citizen of the United States, residing at Chicago, in the county of (look, State of Illinois, have made a certain new and useful Invention in Spark-Coils, of which the following is a specification.

This invention relate." to spark coils of the character required for use in connection with ignition systems of explosive engines, although spark coils emlmdying my inven tion are equally well adapted for use in other relations and for other purposes for which such coils are required or devised.

The object of the invention is to, provide a construction of spark coils of the character referred to which is simple, inexpensive, strong, durable "and etlicicnt, and which is not affected by moisture. I

Other objects of the invention will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and rel ative arran emcnt of parts, all as will be more fully iercinatter set forth, as shown in the accompanying draw'nw, and finally pointed out in the appended c aims.

Referring to the accompanying drawing, and to the. various views and reference signs appearing thereon Figure 1 is a view in transverse section of a construction of spark coil embodying my invention. Fig. 2 is a longitudinal section of-the same.

In the drawing, reference sign A, designates a base of cast iron, and B, an inelosing cup-shaped easing of the samematerial, the base and easing being fittedand secured together to inclose the coil I), and its core F,

said coil and core being supported longitndmallybetween the base and the end of the casing, one end of the core resting on the interior surface of the base, and the inner surface of the casing end bearing a ailist the other end of the core. If desired, and preferably, a sheet of insulating materiabM, may be interposed between the end surfocc of the core and the surface of the base A, against which the core bears thereby fori'ning and maintaining a se oration of the end surface of the core and t e adjacent Surface of the base, to constitute agap at this point in the magnetic circuit. The coil D, is preferably of heavy cop or wire and is wound upon the core F, witii an inter os'ed insulat in Sloeve'br material E,there tWeenJ-Thc tan 5 of the coil terminate at binding posts K, which project through openings in the casing, being insulated therefrom by means of the sleeve and washers indicated at H. The ends of the coil are sccured'in eflicicnt electric contact withthc binding posts K, by means of the plates or washers (l, and, out side the casing, the binding posts are equipped with the usual binding nuts and washers J, IA for circuit Wire cornicctions.

If desired, and in order to secure durability of the device and also to protect the coil against moisture, the space t, between the coil and easing may be filled with insulating compound.

The core F is made up of plates or lami nations of iron, and these may be arranged in any suitable or convenient relation with respect to each other for the wire or conductor coils to be'wound therearound into 0y lindrical form.

It has been demonstrated that except as to its permeability, cast iron behaves very much like laminated iron with respect to the rapidity with which it demagnetizes. This is due to its porosity and high electrical resistance. In carr ing out my invention, therefore, I emp 0y cast iron for the base and casing, and I make these parts sufficiently heavy to carry the magnetism of the laminated core to form very nearly a closed magnetic circuit. In fact this magnetic circuit is closed except for the gap formed by the sheet M interposed between the base casting and the core, and since the mass of cast iron composing the base and easing surrounds and incloses the coil and its core I am enabled to secure the desired results and to produce a strong durable device having great cfiieicnc as a spark coil, and which can be cheapy manufactured, and which is protected from moisture.

It will be observed that the laminations composing the core are not symmetrically arrangedhwithin the coil. This is due to the fact that the laminations, in the Blblf'tb lar construction shown, are in the orm of 'rflat plates of ual rectangular size which are inclosed wit in a circular coil. My invention, however, in its broadest scope as defined in the claims, is not to be limited or restricted in this respect.

It will also be seen that by employing heavy cop or wire for magnet coil windings I am enabled to secure a high impedance with low resistance in the magnetizing coil, thereby rapidly accumulating and storing encrgv in the circuit when the circuit is (JOSH. and also rapidly returning such energy to the circuit when it is opened, and hence enabling the released energy to augment the spark making the latter of greater length and of greater degree of heat than is possible from the battery or current source energ alone, and hence very greatly increasing t e efiiciency of the spark discharge.

Having now set forth the object and nature of my invention, and a construction ernbodying the principles thereof, what I claim as new and useful, and of my own invention,

and desire to secure by Letters Patent is,'-

1. In a spark coil, a cast iron base, a cast iron casing supported thereon, said casing having a permanently closed integral end, a laminated core independent of the casing and its base and arranged Within the casin and having its ends presented toward and held between the base and closed end, respectively, of the casing thereby forming air gaps between the ends of the core and the base and closed end respectively of the cars ing, a single he'avy low resistance coil surrounding the laminated core and inclosed within the casing, and circuit terminals for said coil, said terminals extending through to the outside of the casing. 2. In a spark coil, a cast iron base, an inverted cup shaped cast iron casing supported thereon, a laminated core independent of the base andcasing, but contacting at one end with the inner end surface of the inverted cup-shaped casing and resting at its other end u on said base, an insulating sheet interpose between the core and base a heavy low resistance conductor coil surroundin said core, and circuit terminals for sai coil, said terminals extending throu h said casm -3. n a spark CO1 a cast iron base, an 111-- verted cup-shaped cast iron casin supported thereon, a laminated core in ependent of the base and easing, but contacting at one end with the inner surface of, the inverted cup-shaped casing, and resting at its other and upon .said base, an insulating sheet intei osed between said core and base, an insulating sleeve inclosing said core, a heavy low resistance conductor coil surrounding said sleeve, and circuit terminals for said coil, said terminals extending through the Wallof said casing.

In testimony whereof I have hereunto set my hand in the presence of the subscribing witnesses, on this 11th day of November CHESTER H. THORDARSON.

Witnesses SYLvANos E. LAMBERT, HENRY L. HANLEY.

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