Патент USA US2131937код для вставки
Oct. 4, 1938. 2,131,937 R. DEwAR ET AL INSULAT ING COVER Filed May 17, 1954 12 __ _ .___ _ __ _ __ 77 10 MÍ NVENTOR. BY ¿1MM 1, ATTORNEYS. Patented Oct. 4, 1938 2,131,937 ` UNITED STATES PATENT OFFICE 2,131,937 INSULATING COVER Robert Dewar and William T. Sanford, I-Ioosick Falls, N. Y. Application May 17, 1934, Serial No. 726,060 3 Claims. (Cl. 123-148) This invention relates to insulated covers or caps, and especially to insulated covers or caps member I0 and the housing members are desir for the distributors or coils which are employed in the ignition systems of internal combustion en gines. As heretofore constructed, such covers or caps were made from a material, such as Bakelite, compound having a dielectric strength of at least 300 Volts per milliampere to prevent failure of having a high insulating value, and they were provided with a centrally disposed housing mem ber adapted to receive a conductor which led from the spark coil to the rotor element of the distributor and with a plurality of peripherally disposed housing members adapted to receive con ductors which led from the contact elements of the distributor to the spark plugs of the system. In many instances, however, it is desirable to adjust the intensity of the spark to- obtain maxi mum efiîciency, and for this reason it is now com mon practice to employ auxiliary spark intensify ing devices between the distributor and the spark plugs. This arrangement however, is unsatis factory due principally to the fact that the aux iliary unit frequently becomes disconnected from the system, thereby causing open circuits. In accordance with the present invention, how ever, the above objection obviated by incorporat ing adjustable spark intensifying devices in the housing members of the cap or cover of the dis tributor. For a clear understanding of the invention ref erence may be had to the accompanying drawing. In the drawing, the invention is shown merely in preferred form and by way of example but obvi ously many variations and modifications may be made therein which will still be comprised within C its spirit. It is to be understood, therefore, that the invention is not limited to any specific form or embodiment except in so far as such limitations are specified in the appended claims. Referring to the drawing: O Figure l is an elevational view in section show ing one embodiment of the invention; Figure 2 is an elevational View in section show ing another embodiment of the invention; and Figure 3 is an enlarged view in detail of the adjustable unit employed in the present invention. ably moulded as a unit and from a substance or the device after it has been in use. A metallic terminal I3 is positioned in the lower end of each of the housing members, the lower end of the terminal positioned in the centrally disposed hous ing member I I being provided with a carbon con tact button I4 through which contact is con stantly made with the usual rotor arm (not shown) and the lower ends of the terminals posi tioned in the peripherally disposed housing mem bers being extended downwardly to form exposed terminals I5 through which contact is made with the rotor arm as it rotates. The method of es tablishing electrical communication through the distributor cap is well known and detailed descrip tion thereof is not deemed necessary. In one embodiment of the invention, as shown 20 in Fig. l, the upper ends or contacting surfaces I6 cf the terminals I3 in the housing members is in contact with the moulding compound or sub stance but this is desirable only when the com pound or substance has an exceedingly high break 25 down strength as for example, a break down strength greater than 300 volts per milliampere since under such conditions there is substantially no current leakage from the terminal through the 30 compound or substance. In another embodiment of the invention, as Shown in Fig. 2, the central portion of the upper ends of the terminals I3 in the housing members form projecting studs I'I so as to provide an air space between the upper ends or contacting faces I6 and the moulding compound or substance. The upper end of each of the housing mem bers is provided with means whereby an adjust able spark intensifying device may be assembled therein, and to this end the upper end of each of 40 the housing members is provided with screw threads I8. As shown more clearly .in Fig. 3, the spark intensifying device desirably employed com prises a tubular member 2B adapted to receive the end of an insulated conductor (not shown) and 45 Figure 4 is a detail cross section of the intensify ing device mounted in the housing. As shown, the cover comprises a cup-shaped member I0 from the central portion of which a housing member I I opens outwardly and from the periphery of which a plurality of similar housing members I2 open outwardly in spaced relation. the lower end of which is closed to form a con tacting face 2|. The outer upper surface of the tubular member is provided with screw threads 22 adapted to engage the screw threads I8 in the housing members so that the position of the de 50 vice may be varied in the housing members to vary The number of peripherally disposed housing members correspond to the number of spark plugs in the system. The cover or cup-shaped Having thus described our invention, we claim: l. In combination, an insulating cover compris ing a cup-shaped member having a housing mem the spark intensifying properties of the device. 2 2,131,937 ber extending outwardly therefrom, and a` spark intensifying device positioned in said housing member, said device comprising a tubular member closed at one end to form a contacting face and open at the other end to receive a conductor. 2. In combination, an insulating cover compris ing a cup-shaped member having a housing mem ber extending outwardly therefrom, and an ad justable spark intensifying device positioned in 10 said housing member, said device comprising a tubular member closed at one end to form a con tacting face and open at the other end to receive a conductor. ` 3. In combination, an insulating cover compris ing a cup-shaped member having an internally threaded housing member extending outwardly therefrom, and a spark intensifying device posi tioned in said housing member, said device com Ol prising a tubular member having its upper end open and in threaded engagement with said hous ing member and its lower end closed and out of contact with said housing member. 10 ROBERT DEWAR. WILLIAM T. SANFORD.