USRE14113E - Spark-coil - Google Patents

Spark-coil Download PDF

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Publication number
USRE14113E
USRE14113E US RE14113 E USRE14113 E US RE14113E
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US
United States
Prior art keywords
core
coil
spark
winding
side pieces
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English (en)
Inventor
Chester H. Thordarson
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  • This invention relates to improvements in make and break spark coils for use in ignition systems of explosive engines, of that type embracing a source of direct current supply, as a battery, which is connected in a circuit in series with the winding of the coil, whereby when the circuit is closed upon the winding :1 portion of the energy developed in the winding is stored up in the magnetic circuit of the winding, which energy, upon the opening of the circuit, as between the electrodes in the engine cylinder, is withdrawn from the magnetic circuit and induces in the winding of the coil an electro-motive force which follows the break in the circuit at the electrodes to produce the igniting spark.
  • a further object of the invention is to provide a coil of the character referred to having a divided magnetic circuit and a winding of minimum resistance and minimum turns, and therefore of least self-1nduction, and capable of storing up consid erable energy and rapidly dissipating the same in the spark, whereby comparatively little battery power is lost in the production of a spark of ample intensity.
  • a further object of the invention is to produce an eflicient make and break spark coil of reduced weight, size and cost, as compared to the present spark coil practice.
  • Figure l is a View in side elevation of an ignition or spark coil embodying the principles of my invention.
  • Fig. 2 is a view partly in top plan and partly in section, on line 22, of Fig. 1, looking in the direction of the arrows.
  • Fig. 3 is a view in transverse section on the line 33 of Fig. 2, looking in the direction of the arrows.
  • Fig. l is a view in transverse section showing a modified construction of the core embraced within the spirit and scope of my invention.
  • ⁇ Vhen a closed ring of uniform transverse sectional area and material is anagnetized in such a way that the magnetlc flux is parallel with the ring, such a ring, does not demagnetizc when the current is broken, even when made of soft iron.
  • a ring can,be partially demagnetized with hammer blows, and completely demagnetized by current flowing in the opposite direction around it.
  • Such a ring therefore is not the most economical or ellicient or desirable for use in connection with ignition, spark or impedance coils for the reason that the stored up energy in the magnetic circuit thereof is not dissipated in the spark, and hence considerable magnetic power is lost, being retained in the iron of the ring. If, however,an air space or gap is provided transversely through the body of the ring,
  • Such a ring will demagnetize when themagnetizing circuit is broken, the speed of the demagnetization depending on the quality of the iron in the ring, or the sub-division of the body thereof into laininations or Wires.
  • Make and break spark coils employing a magnetic circuit so sub-divided into laminations or wires and having any air go or gaps formed transversely therethrou at convenient points.
  • A is a coil or single Winding which may be of usual or well known construction and arrangement for use in apparatusot this character, it bein shown as Wound upon a sleeve or spool K of insulating material which surrounds and is mounted in the core B.
  • the said winding A composed of suitably insulated wire,- is wound in a close, compact bun- T dle upon the sleeve A, with the turns thereof lying one upon the other, both in radial and longitudinal direction, thus contributing to the compactness of the device.
  • the said winding is a low resistance winding so as to afford little resistance to the current induced therein by the reactive force of the magnetism of the magnetic circuit upon the instant of the break in the electric circuit in which the winding is included, so that thereby the induced current is utilized to the fullest-ex.- tent inthe production of a hot, tat spark.
  • coils adapted for average medium horse power gas on ines may be constructed with a winding ot twenty gage copper wire of in the neighborhood of two hundred turns, with a resistance of about one-half ohm.
  • my invention is not tobe in all cases limited or restricted, I prefer to employ a sub-divided core.
  • T have shown the core made up of plates or laminations.
  • I have shown the core, B, made up of wire rods or sections. llhe particular character of sub-divisions of the core is therefore immaterial in the broadest scope of my invention.
  • the laminated form is preferable, however, on account of the cheapness of manufacture.
  • the magnetic circuit of the coil is completed through one or more side pieces or return members C. As shown, two of these side pieces are employed which extend on diametrically opposite sides of and are disposed in arallel relation with respect to the axis of t e coil. Each side piece is shown as provided at its ends with the inwardly turned portions D, the inner faces thereot, constituting pole faces which are presented toward or arranged to bear against the core at ire B, or B, at opposite ends of the coil, and
  • the side part or parts, C may be held in assembled relation with respect to the core of the coil in any suitable or convenient manner.
  • l have shown a simple and etiicient way for accomplishing this result, consisting of spring channel plates ll", preferably of non-magneti'zable material, which are slipped over each end of the core and the adjacent ends of the side part or parts C, as clearly shown in the drawing.
  • the clips not only hold the circuit members of the magnet in proper assembled relation, but also hold the laminations or parts of the members assembled.
  • the terminal flanges ll?" of the clips F at one side of the coil are shown in Figs. 1 and 3 as extending beyond one side of the winding so that said extended flanges may constitute means by which the coil may be supported, as is evident.
  • the provision of the air gap or gaps between the contacting or juxtaposed surfaces of the side part or parts C, and the core 13, B, such for instance as isaiiorded by the interposing therebetween of the insulating strip or strips E, enables the magnetic flux of the magnetic circuit to rapidly release or close on the winding, when the electric circuit in which the winding of the coil is included is broken, whereby the magnetic energy stored up in the metal of the magnetic circuit, when the electric circuit of the coil is so broken, is transformed into heat to augment the spark produced by and at the break in the electric circuit, and which energy so stored up is dissipated in the spark, thereby making the spark longer and hotter, and hence increasing the spark- 1ng efficiency of the coil without increasing the consumption of battery power.
  • a spark coil having a laminated core, in combination with independent side pieces arranged to bear against the core at the ends thereof, and channel clips engaging the ends of the core and side pieces to retain the same in assembled relation.
  • a spark coil having a core and a subdivided side part formed with pole faces presented toward but separated from the ends of said core and channel plates engaging the ends of said core and side part to hold the same in assembled relation.
  • a spark coil having a core, in combination with independent side pieces having pole faces arranged to bear against the sides of the core at the ends thereof, and means engaging the ends of the core and side pieces to retain the same in assembled relation.
  • a spark coil having a laminated core, in combination with independent side pieces having pole faces arranged to bear against the sides of the core at the ends thereof. and means for engaging the ends of the core and side ieces to retaln the same in assembled relation.
  • a spark coil having a core, in combination with independent laminated side pieces having pole faces tobear against the sides of the core at the ends thereof, and means to retain the same in assembled relation.
  • a spark coil having a laminated core, in combination with independent laminated side pieces arranged to bear against the sides of the core at the ends thereof, and means engaging the ends of the core and side pieces to retain the same in assembled relation.
  • a spark coil having a core, in combination with independent side pieces having pole faces arranged to bear against the sides of the core at the ends thereof, insulating material interposed between the bearing surfaces of the core and side pieces, and means engaging the ends of the core and side pieces to retain the same in assembled relation.
  • a spark coil having a'laminated core, in combination with independent side pieces having pole faces arranged to bear against the sides of the core at the ends thereof, insulating jmaterial interposed between the contacting surfaces of the core and side pieces, and means engaging the ends of the core and side pieces to hold the same in assembled relation.
  • a spark coil having a core in combina tion with independent laminated side pieces having pole faces arranged to bear against the sides of the core at the ends thereof, insulating material interposed between the contacting surfaces of the core and side pieces, and means engaging the ends of the core and side pieces to retain the same in assembled relation.
  • a spark coil having a laminated core in combination with independent laminated side pieces having pole faces arranged to bear against the sides of the core at the ends thereof, insulating material interposed between the contacting surfaces of the core and side pieces, and means engaging the ends of the core and side piecesto retain the same in assembled relation.
  • a spark coil having a core, in combination with independent side pieces arranged in parallel relation with respect to the coreand having pole faces at its ends directed toward and bearing against the side of the core at the ends of the latter, and means engaging the ends of the core and side pieces for retaining the same in assembled relation.
  • a spark coil having a core, in combination with independent side pieces arranged on opposite sides of the core and in parallel relation with respect thereto, the
  • ends of the side pieces forming pole faces and being directed toward and bearing against the sides of the core at the ends of the latter, and means engaging the ends of the core and side pieces for retaining the same in assembled relation.
  • a spark coil having a laminated core, in combination with an independent laminated side piece arranged in parallel relation the core and in parallel relation thereto, said side pieces having their ends forming pole faces and directed "toward and bearing against the sides of the core adjacent the ends of the latter, insulating strips interposed between the bearing'surfaces of the core and side pieces and means engaging the ends of the core and side pieces to retain the same in assembled relation.
  • a make and break spark coil especially'adapted for ignition systems of explosive engines comprising an all laminated magnetic circuit consisting of a core memher and a return member,-the planes of the laminations being parallel to the path of the magnetic flux, the said magnetic circuit being transversely divided at at least one point in the path of the magnetic flux by a narrow air ga and a single winding on said core mem er, said winding being of such low resistance and of such few turns as to rapidly magnetize the core member when the coil is energized and to rapidly transmit the energy induced in the winding upon the opening of the Winding circuit into a maximum spark with a minimum loss of impressed energy.
  • a make and break spark coil espe cially adapted for the ignition systems of explosive engines having a magnetic circuit which consists of an all laminated core member and an all laminated side member disposed generally parallel thereto, the
  • a make and break spark coil especially adapted for ignition systems of explosive engines comprising a laminated core of the closed magnetic circuit type having Wound thereon a single coil of such few turns and ofsuch low resistance as to possees a time-constant of low value, to thereby rapidly energize the core when "the coil” is energized, and the core being provided with a narrow air-gap to cause a rapid demagnetization upon opening the energizing circuit thereby producing a rapid transformation of the stored magnetic energy into a current of increased volume.

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