US1403441A - Spark plug - Google Patents

Description

J. J. NORRIS.

SPARK PLUG.

APPLICATION FILED MAR. 6, [920.

wzyz.

Patented Jan. 10, 1922.

JOHN J. NORRIS, OF SUTTONS BAY, MICHIGAN.

SPARK PLUG.

Specification of Letters Patent.

Patented Jan. 10, 1922.

Application filed March 6, 1920. Serial No. 363,636.

To all whom it may concern:

Be it known that 1, JOHN J. NORRIS, a citizen of the United States, residing at Suttons Bay, in the county of Leelanau and State of Michigan, have invented certainnew and useful Improvements in a Spark Plug, of which the following is a specification.

The invention relates to a spark plug and more particularly to the construction of electrodes for spark plugs.

The primary object of the invention is the provision of a spark plug, wherein the electrodes thereof have formed thereon novel sparking tips so as to increase the efliciency of the spark plug, as the accumulation of carbon and oil at the tips is eliminated and at the same time the requisite sparking may be effected.

Another object of the invention is the provision of a spark plug of this character, wherein the sparking tips of the electrodes can be more easily cleaned and a wider sparking surface is provided to assure a more positive and greater sparking action of the plug in the use thereof.

A further object of the invention is the provision of a spark plug of this character, wherein the electrodes thereof are provided with enlarged terminals spaced opposite each other in alignment with the central axis of the plug and are formed with opposed registering flat surfaces, spaced the required distance apart for effecting the sparking gap, the formation of the terminals of the electrodes being such as to prevent the accumulation of carbon upon the flat surfaces as the latter will be shielded by the enlarged terminals and the carbon deflected therefrom.

A still further object of the invention is the provision of a spark plug of this character, which is extremely simple in construction, thoroughly reliable and efiicient in its purpose, strong, durable and inexpensive'to manufacture.

With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts, as'will be hereinafter fully described, illustrated in the accompanying drawings and pointed out in the claim hereunto appended.

In the accompanying drawings:

Figure 1 is a side elevation of the spark plug constructed in accordance with the invention, a portion of the shell thereof being broken away to show in detail the terminals of the electrodes.

Figure 2 is a bottom plan view of the spark. plug.

' Similar reference characters indicate corresponding parts throughout the several views of the drawings.

' Referring to the drawings in detail the spark plug comprises an outer shell 5, which is of the usual well known construction having the the externally threaded lower portion 6 for the attachment thereof in the cylinder of an internal combustion engine and fitted within this shell is the porcelain or other like insulator core 7 the same being retained in the shell 5 through the medium of a lock nut 8 removably fitted in the upper end of said shell in the ordinary well known manner, the upper end portion of the shell being externally shaped to provide wrench engaging surfaces 9 as usual for the convenient mounting of the shell 5 within the cylinder of the internal combustion engine.

Fitted centrally within the core 7 is the primary or main electrode 10 which extends beyond the upper end of the core 7 and has threaded thereon as usual a binding nut 11 for the fastening of one of the current wires of an electric ignition system therewith, the lower portion of the electrode 10 being extended beyond the lower end of the core 7 and terminates approximately flush with the lower edge of the shell 5 or in other words in the same plane with said edge.

Fitted within the lower edge of the shell 5 is the secondary or auxiliary electrode 12, the end thereof being engaged in the shell is fastened rigid in any suitable manner, while the opposite end portion of said electrode 12 is curved inwardly and upwardly to have its extremity vertically aligned with the electrode 10 as is clearly shown in Figure 1 of the drawings.

The\electrodes l0 and 12 are formed with enlarged circular shaped sparking ends 13 provided with opposed flat faces 14: which are spaced the required distance apart to provide the requisite sparking gap between the faces 14, the enlarged ends 13 being shaped so that when the same are in registration with each other the fiat surfaces 14 will be shielded by said ends 13 to prevent the accumulation of carbon or oil upon the surfaces 14 and at the same time will increase the sparking capacity of the electrodes l0 and- 12 to assure maximum sparking effectin the use of the spark plug.

It will be apparent from Fi ure 1 of the drawings that the enlarged en s 13 in their disposition with respect to each other are of reversed approximately cone shape so as to shield the flat surfaces 14 to shed carbon and foreign matter from said surfaces and thus avoiding the possibility of the retarding of the'spark created at the sparking tips of the electrodes of the spark plug and maximum sparking surface is provided at the tips of said electrodes as Will be clearly apparent.

From the foregoing it is thought that the hereto.

JOHN J. NORRIS.

Images