US1398457A - Spark-gap attachment for spark-plugs - Google Patents

Description

J. S. FAULKNER.

SPARK GAP ATTACHMENT FOR SPARK PLUGS. APPLICATION FILED Npv. 14,.1919.

1,398,457, Patented Nov. 29, 1921.

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PATENT OFFICE.

JAMES S. FAULKNER, OF PETERS BURG, VIRGINIA.

SPARK-GAP ATTACHMENT FOB, SPARK-PLUGS.

Specification of Letters Patent.

Patented Nov. 29, 1921.

Application filed November 14, 1919. Serial No. 337,927.

To all whom it may concern:

Be it known that I, JAMES S. FAULKNER, a citizen of the United States, 'residin at Petersbur in the county of Dinwi die,

State of irginia, have invented certain newand useful Improvements in Spark-Gap Attachments for- Spark-Plugs; and I do hereby declare the 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 tomake and use the same.

This invention relates to spark plug attachments and more particularly to an attachment for providing a sparkgap of which one sparking terminal is provided by the nut ordinarily employed for connecting the circuit wire with the, central electrode of the spark plug. v

The invention has for its object to provide an article that may be easily and quickly put in place and which may be both applied and adjusted by one unfamiliar with the general subject.

In the drawings:

Figure 1 is a perspective view showing a spark plug equipped with the present invention.

. Fig. 2 is a section taken longitudinally through the base memberlof the attachment in the plane of the spark plug and the cirv cuit wire connecting the binding post of the attachment, with parts in elevation.

Fig. 3 is a detail perspective view of'the plate that is carried adjustably by the base and which constitutes one sparking terminal.

Fig. 4 is a transverse section through the basein a. plane including the axis of the binding p st.

Referring, now to the drawings the present spark gap attachment comprises an insulating base 5 having a perforation 6 near one end that is designed to receive the upperend portion of the central electrode 7 of a com mon type of spark plug 8 and which is held securely upon the electrode, by means of the usual clamping nut 9 that is commonly employed'foif attaching a circuit wire.

The opposite end portion ofthe insulating base 5 is slotted longitudinally, as shown at 10 to receive the stem of'a binding post. This binding post stem comprises a threaded cylindrical body portion 11 at the base of which is a cross sectionally rectangular enlar ement 12 that is fitted to slide longitudial 3 of the slot 10 while below this portion 12 is the annular enlargement or disk member 14 that fits slidably against the under .face of the body 5. This binding post stem,

which is in effect, a screw that is inverted and passed upwardly through the slot 10 has disposed upon its threaded body portion 11 a plate 15 which is perforated for the purpose and one end portion of which rests upon the upper surface of the base 5, while its other end portion is tapered and is offset from the base portion 5 and is directed toward the clamping nut 9 of the spark plug, hereinbefore referred to. The plate 15 is movable with the binding post screw in the adjustment of the latter in the slot 10, so that its pointed extremity may be spaced from the nut 9 a distance to insure most eflicient operation of the device and after adjustment, the parts are clamped securely to the base 5, by means of a thumb nut 16 that rsengaged with the threads of the body portion 11.

Upon the body portion 11 is engaged .a jam nut 17 having a circumscribin channel 18 in its upper end portion to receive the usual reslllent prong of a circuit wire connector, it being understood of course that when desired and circumstances dictate, the terminal may-be held between the jam nut and the clamping nut.

the applicationof the attachment to a spark plug requires only that the ordinary clamping nut 9 of a spark plugbe removed,-that the base member 5 be then engaged over the sparking plug electrode, that-the nut 9 be then screwed down and that the circuit wire be then connected in either manner described and the terminal plate adjusted to give the re uired spark gap.

y reason of the downturned finger 18, of the plate 15'engaging in the slot 10, rotation of the plate is prevented, not only when the article is in use-but also when the nuts of the binding post are manipulated. The structure thus permits of delicate adjustment and insures positively against loosening of the parts under the influence of vibration of the engineand other extraneous influences.

With this construction it will be noted that upon the base andhaving at one end a finger slidably engaged with the slot and having its opposite end offset from-the'base and directed toward said perforation, and means engaged throu h the slot and the plate for clamping the p ate to the base.

2. A' sparkgap attachment for spark plugs comprising an insulating base plate havmg at one end a perforation to receive 10 the electrode of the spark plug and at its other end a longitudinal slot extending in the' direction of the perforation, a screw having an angular base slidably mounted in the slot and held against rotation therein,

the screw below the base being enlarged and 15 impinging against the under 7 face of the foration and having at its op osite end a finger slidably engaged in the s ot, a clamping nut engaged upon the screw against the plate anda jam nut uponthe screw and against the clamping nut.

In testimony whereof I affix my signature.

JAMES S/,-'FAULK'NER.

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