US2325549A - Ignition cable - Google Patents

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y 1943 J. P. RYZOWETZ 2,325,549

IGNITION CABLE Filed May 24, 1941 a G/ar: 07f

lNVE NTOR fl f w f MW ATTORNEfiSi Patented July 27, 1943 p 2,325,549

UNITED STATES PATENT OFFICE IGNITION CABLE John P. Ryzowitz, Wallington, N. 1., assigner to The Okonite Company, Passaic, N. 1., a corporation of New Jersey Application May 24, 1941, Serial No. 395,015 1 Claim. (01. 174-110) My invention is directed to an improvement in fixed cable size is best accomplished by using the ignition cables for internal combustion engines, smallest conductor practicable.

and has for some of its objects the provision of It is appreciated that a copper conductor is a cable of great tensile strength, light weight and far superior to steel, for instance, so far as the possessing excellent conducting properties. spark produced at the spark plug is concerned,

The usual ignition cable merely comprises an and while some contend that radio interference insulated copper conductor. Such a cable has is reduced by employing a high resistance conlittle tensile strength and for this reason trouble ductor such as steel, it is very evident that radio is experienced with rupturing of the cable when interference is not a problem where, as is the it is pulled into the usual shielding harness so usual case in modern practice, the cable is inoften employed in practice, particularly in airstalled in metal shielding harness.

plane work. The suggestion has been made that In the accompanying drawing I have illusthe conductor be made of steel instead of copper. trated an embodiment of my invention on a While steel has greater tensile strength than copgreatly enlarged scale. 2' designates the conper, it is a relatively poor electrical conductor. in us l s cord c f my b 4 i te Consequently such a cable while better in one the conductor. This conductor is cop r and respect is poorer in the more important respect, is composed of a plurality of strands stranded to wit, electrical conducting characteristics. about the core. 6 is the insulation which is of By the present invention I provide an ignition any of the materials now used in practice and cable possessing the tensile strength of steel, of Well known to all skilled in this art. 8 is the light weight as compared with a steel conductor outer covering su h s l q e e ott n braid. cable or a cable employing copper and steel, and It will be appreciated that the glass cord core inasmuch as in my cable I employ copper for takes the longitu D11 n the cable, and inthe conductor the conducting characteristic of asmuch as this core has the tensile stren the cable is high, of steel my cable possesses all of the advantages More specifically my inventionprovides an igni- 0f -s cflnduOtOr c e S far as Stre gt is tion cable comprising a continuous glass cord concerned with none of the disadvanta s due center about which I strand copper wires conto poor conducting characteristics.

stituting the conductor of the cable. Over-all I It is to be understood that changes may be provide any of the insulating layers or sheaths made in the details 01 construction and arrangeemployed in ignition cable practice, all or which ment of parts hereinabove described without deare familiar to those skilled in this art. The parting from the spirit and scope or the invenglass fcord core takes the pull on the cable and tion.

inasmuch as it has such high tensile strength, it What I claimis: will be evident that my construction permits High tension ignition cable for internal comof the use of smaller copper wire than used prebustion engines comprising in combination a conviously, whereas previously it was necessary to tinuous glass cord core, having a tensile strength use steel or similar material, but, in any event, substantially equivalent to that of steel, 9, copper a poor conductor, in order to reduce conductor conductor stranded about the core, and an insize while retaining strength. sulatln covering about the core and conductor Furthermore, since continuous glass cord is assembly, the core and conductor being so asstronger per unit cross sectional area than silk, sembled that rupturing otthe conductor due to for example, its use results in a. smaller size a longitudinal pull on the cable is prevented by conductor resulting in possible lower capacity per the core. unit length. Low capacity is or appreciable ad- JOHN P. RYZOWI'IZ. vantage in ignition cable and due to generally I

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