US893955A - Spark-plug. - Google Patents

Description

PATENTED JULYZI, 1 908.

0. T. IVAN WOERT.

SPARK PLUG.

APPLICATION FILED AUG. 1. 1907.

, wax

. epark gap.

55 threads and a shoulder 11.

CLARENCE THORN VAN WOERT, OF NEW YORK, N. Y.

SPARK-PLUG. I

Specification of Letters Patent.

Patented July 21, mos.

' hpplicatio n filed August 1', 1907. Serial No. 386,839.

To all whom it may concern:

Be it known that 1, CLARENCE Tnonn VAN Wonn'r, a citizen of the United States, and a resident of the city of New York, borou h of Brooklyn, in the county of Kings and tate of New York, have invented a new and Improved Spark-Plug, of which the following is a full, clear, and exactdescription.

This invention relates to certain improvements in spark plugs for use in connection with internal combustionengines and the like, and-relates more particularly to means for preventing lubricating oil or other liquids within the cylinder which come in contact with the spark plug,from passing the If lubricating oil is present upon e terminals of the-electrode and adjacent the spark gap at the time the spark passes, the Oll often becomes decomposed and soot or carbon is deposited upon the terminals and the passage of the spark materially interfered with. If the liquid is of a conducting nature, a drop may collect and connect the I two electrodes and permit of a passage of the current without a spark.

In my improved construction, it is impossible for oil or other liquids to pass the spark.

gap, as any and all li(' uids which come into the vicinity of the terminals are drained away from the spark gap. The spark is formed within the recess and adjacent the innermost portion thereof, and the first portion of the explosion, therefore, .takes lace within the recess. The outward ms 1 of flame from the s ark gap toward the interior of the engine cy inder serves to remove all oil or other liquid which may be upon the inclined drainin surface of the core or upon the lower electror e. Thus the electrodes adjacent the spark gap are kc t clean both by the-draining action and by t e sweep of flame at the beginning of the explosion.

Reference is to be had to the accompanying drawing, forming a part of this specification, in Which .the figure shows a central longitudinal section through a spark plug constructed in accordance with my invention.

The spark plug comprises a casing 10 having one end thcre'df threaded and adapted to be screwed into an opening in the engine: cylinder or other explosion chamber. The casing is )ro'vidcd with a centrally-disposed passage tliercthrough and the outer end of .the passage is provided with internal screw Extending through the casing is a core 12 of porcelain or other suitable non-conducting material and having a flange 13 engaging with the shoulder 11 to limit the inward movement of the core.. The core is held in place by athreaded sleeve 14 engaging with the outer surface of the flan e 13 ol" the core and holding the latter firm y in lace. The core is provided with a centralydisposed passage therethrough, and extending through this passage is an inner or central electrode 15 which as illustrated maybe somewhat smaller than the passage. The outer end of the electrode is cemented or otherwise rigidly secured to the core and connects with a metallic collar 16 at'the outer end.

An electric wire 17 is held in place upon the collar and the electrode by a suitable thumb nut 18, "l he inner end of the. core is pro vided witha recess, the innermost portion of 75 which is at the central passage of. the core, and the inner electrode 15 terminates sub-- stantially flush with the surface ofjthe recess. The walls of the recess form a draining surface from. the terminal to the electrode, and any oil or other liquid which may splash against the spark plug or in any other manner come into contact with the electrode 15 and the-core, will immediately drain out ofthe recess and away from the electrodc'to the outer annular drip ed e 19 of the core. The other wire 20 of the e ectrode surrounds the gland formed by the threaded sleeve 14 adjacentthe outer end of the s ark plug casing or body 10, and is firmly helilinengagcment therewith by a suitable nut 21. This nut serves not only to hold'the electric wire in place and form a firm contact therewith, but also serves as a lock nut for preventim the accidental displacement or the working dose of the gland. At the inner end of the body or casing 10, there is provided a second electrode 22, substantially U-shaped in form and having one end secured to and supported by the casing and the other end extending up into the .recess'in the end of the core to a point closely adjacent the end of the other electrode 15. As the terminal portion 23 of this second electrode extends u ward it is evident that any oil or other liquid which may come into engagement therewith will immediately drain down to the lowermost o'r bowed portion of the electrode and drip therefrom.

By means of the above construction it 18111 practically im ossible'for oilto accumulate at the tcrminu sof the electrodes, as both of them are so constructed as to brin about an immediate shedding r draining o' the oil or liquid. It is evidentthat any drops which may accumulate at the annular drip edge 19 core of insulating material having a recess in its lower or inner end, an electrode extending (hrough said core and terminatim within aid recess substantially flush with the innermost portion thereof, and a second electrode extending into said recess from below and terminatlng adjacent the end of the firstmentioned electrode to leave a spark gap therebetween, adjacent the innermost portion of the recess, whereby all oils or other liquids are automatically drained away from name to this specification in the the spark ga by the walls of the recess and the second c ectrodc, and whereby the first )ortion of the explosion sweeps said liquids irom the recess.

2. In a spark plug, a downwardly-extending electrode an upwardly-extending electrode'spaced therefrom to leave a spark gap, and means for maintaining said spark gap free from oils or other li uids, said means including a rounding tie first-mentioned electrode adjacent its extreme end and having inclined walls extending downwardly and outwardly from said extreme end to form a recess with the spark gap in the inn ermost portion thereof.

In testimony whereof I have signed my two subscribing witnesses.

CLARENCE THORN VAN WOERT.

ieceofinsu ating material surpresence of 40

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