US1723706A - Spark plug - Google Patents

Description

CII

Patented Aug. 6, 1929".

UNITED STATES HARVEY s. PRATT, or WHITING, IOWA.

SPARK PLUG.

Application led March 23, 1928. Serial No. 264,225.

The object et' this invention is to' provide a simple but eliicient means whereby the side electrode in a spark plug may be adjusted longitudinally of the spark plug, as occasion may require, it being a matter ot' common knowledge that the side electrode must often be adjusted as above described, under many conditions, for instance, when the motor is pumping oil.

It is within the province of the disclosure to improve generally and to enhance the util.- ity of devices of that type to which the invention appertains.

`With the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, Without departing :from the spirit of the invention.

In the accompanying drawings:

Figure 1 shows in longitudinal section, a spark plug constructed in accordance with the invention;

Figure 2 is an elevation showing the carrier for the electrode;

Figure 3 is a bottom plan of the structure shown in Figure 2;

Figure 4 is a longitudinal section showing a modified form of the invention.

Referring to Figures 1, 2 and 3, the numeral 1 designates the metal body of the spark plug, the body being provided with an internal shoulder 2. The numeral 3 designates a carrier or ring, made of metal and of conical form, the carrier 3 having an upstanding annular liange 4 of cylindrical form. The carrier 3 is supplied at its lower end with a depending tongue 5, in the outer surface of which a longitudinal groove G is formed. The tongue 5 has transverse openings 7 spaced apart longitudinally of the tongue, the openings 7 communicating with the groove 6. A side electrode is adapted to be mounted in any oi the openings. 7 the electrode 8 provided at its outer end with a head 9 which is received in the lgrooveQGQ` Because the groove 6 is provided for the reception of the head 9, the tongue 5`ean lieupfiat against the inner wall of the body 1 of the spark plug, as shown in Figurei.. The 4carrier 3 rests on the shoulder 2, and the cylindrical.

iiange 4 lits within the chamber in the upper end oil the body 1, in a way which will be understood readily when Figure 1 et the drawings is noted.

The porcelain composition core oit the spark plug is designated by the numeral 1() and carries the usual central electrode 11, which cooperates with the side electrode 8. The core 10 is provided with an enlargement 12 which has a superficial circumferential groove 14. About the enlargement 12, the enforcing collar 15 of metal extends. The collar 15 has inwardly extended annular bead 16, which is U-sha-ped in cross section, the bead 16 being received in the groove 14 of the core. The collar ,15 has an inclined flange 17 which engages the lower end of the cere 10, and bears on 'the carrier 3, the collar 15 being received within the annular flange 4 of the carrier 3 in the bushing 18 threaded into the upper end of the body 1 of' the spark plug and bears on the upper end of the collar 15, only, the iiange 17 of the collar 15 bearing against the carrier 3, and there being no direct compression upon the composition core 10.

It is clear that the electrode 8 may be ad justed lengthwise of the spark plug, by mounting the electrode in any ofthe openings 7 of the tongue 5.

In Figure 4 of the drawings, parts hereinbefore described have been designated by numerals previously used, with the suiix a.

In this form of the invention, the bushing 18 has an internalrecess 19 ior the reception of the enlargement 12n of the core 10, the bushing and the core being permanently connected. The flange 4 of the carrier 3"L is connected integrally to the bushing 18. The body 1EL has a closure 20, the closure being provided with openings 21.

The general operation ot the device depicted in Figure 4 is the same as the opcration oi the device shown in Figure 1, so far as the adjustment of the electrode is concerned.

Having thus described the invention, what is claimed is:

1. A spark plug comprising a body, a can rier in the body and including a part having openings spaced apart, and a straight member insertable into any of the openings, said member being provided at one end with a head completely housed between said part of the carrier and the body of the plug, the

opposite end of said member projecting into the body to form an electrode.

2. A spark plug comprising a body, a earrier in the body and including a part having 5 openings spaced apart, a member insertable into any of the openings and having a head at one end, the opposite end of said member projecting into the body to form an electrode, said part of the carrier having;l a single elongated groove with which all oi the openings communicate, the groove receivingr the head when said member is mounted in any of the openings.

In testimony that I claim the foregoing as my own, I have hereto ai'lixed my signature.

HARVEY S.. PRA' `T.

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