US956778A - Adjustable spark-plug. - Google Patents

Description

J. S. PALMER.

ADJUSTABLE SPARK PLUG.

APPLICATION 211.111) JAN. 1a, 1908.

Patented May 3, 1910.

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JEFFERSON S. PALMER, OF CLARK, SOUTH- DAKOTA.

ADJUSTABLE SPARK-PLUG.

To all whom it may concern:

Be it known that I, JEFFERSON S. PALMER, a citizen of the United States, residing at Clark, in the county of Clark and State of South Dakota, have invented certain new and useful Improvements in Adjustable Spark-Plugs; and I do hereby declare the following to be a full, clear, and exact de scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,

' and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in adjustable spark plugs, the object in View being to generally improve upon and render more eflicient devices of this nature.

The invention consists in various details of-construction, combinations and arrangements of parts-which will be hereinafter fully described and then specifically defined in the appended claim.-

My invention is illustrated in the accompanying drawings, in which Figure 1 is a perspective view of the plug, showlng the adjustable wire terminal attached thereto. Fig. 2 is a longitudinal section centrally through the plug. Fig. 3 is a detailed view of the adjustable terminal, and Fig. 4 is a detailed view of the adjustable jump spark screw.

Reference now being had to the details of the drawings by letter, A designates a plug casing having threaded circumference designed to engage the threaded aperture in the cylinder of an engine, and B is a lock nut having a threaded circumference designed to engage the threads on the inner wall of the casing.

C designates a porcelain insulator which is centrally apertured to receive the firing pin D. Said pin has a threaded end D, uponwhich is mounted a nut E. Mounted about said insulator is packing ring G, made preferably of copper, and against which said lock nut B is adapted to bear, thereby preventing any leakage by the lock nut. Underneath the ring G is a packing Gr, preferably of asbestoes to insure an air tight joint. A loop F s connected to the inner end of the cas ng at points diametrically opposite and said loop carries a jump spark screw H mounted in a threaded aperture in said loop. Said screw has a notch Specification of Letters Patent. 7

Patented ma a, rare.

Application filed January 16, 1908. Serial No. 411,182.

in its inner end forming two points H. By the provision of said loop mounted as shown, two currents of electricity are designed to flow to the jump spark screw, one from either side of the plug, both currents joining at the screw H and causing the positive current flowing through the pin D to jump to the two points of the screw completing the circuit.

An adjustable wire terminal, designated by letter N, is provided having a slot N therein adapted to receive the threaded por-' tion of said firing pin and held in an adjust ed position thereon by the nut upon the threaded end of the firing in., Said terminal has a laterally pro ecting lug N carrying a screw 0 upon which a threaded nut R ismounted, designed to cooperate with a nut S to securely hold a terminal wire. By this adjustable arrangement, it will be noted that, by sliding the terminal back and forth, the wire may be tightened and loosenedas may-be desired and also allowed to revolve about the firing pin.

By the construction of a sparking plug as shown and described, a simple and efficient device is afforded which will work under all conditions in a gas engine and affording two currents flowing through the plug, thereby doubling the efiiciency of the plug, all leakage about the porcelain being prevented and the latter so constructed as to be adjustable in order to suit various gas mixtures and also adjustable for difi'erent voltage. By screwing in the jump spark screw and lessening the gap between the H, thereby same and the firing pin, the plug will Work on exceedinglyweak batteries with satisfactory results and, by increasing the spark gap, the plug maybe adjusted to a very strong voltage and give perfect results under various conditions. Owing to the enlarged air chamber in the bottom of the plug, the suction from the exhaust will clean out the air chamber at each explosion and a plug will be soot-proof. Uwing to the-adjustabilityof the terminal, the wires may be adjusted in any positions and may be readily removed by simply loosening the lock nut.

' What I claim is A hollow sparking plug comprising a shell with an enlarged chambered portion therein terminating in an inclined shoulder, the interior of said shell being contracted beyond the shoulder the one end-of the shell having a semi-cylindrical bridge loop, a screw fitted in an aperture therein and having terminal points, an insulating plug provided with an enlarged chambered portion adjacent to its inner end terminating in a shoulder and provided with a beading upon its circumference a short distance from its inner end, said beading adapted to rest upon the inclined shoulder in the shell with the portion of the plug beyond said beading extending into the contracted portion of the opening beyond said chambered part, a headed screw passing through a longitudinal aperture in said plug and having its head seated upon said shoulder at the inner end of said chambered portion formed in the inner end of the plug, a contracted pin extension upon the head of said screw and forming a terminal, a cap fitted over the outer end of the plug and through which said screw passes, a nut upon the threaded portion of the screw, and a gland about said plug and engaging said shell, as shown and described.

In testimony whereof I hereunto affix my signature in the presence of two witnesses. 25

VVELLINGTON K. Moonn, LINFORD J. l/VILLTAMS.

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