USRE14537E - Alpbed leandeb biggs - Google Patents

Description

A. L. RIGGS.

SPARK PLUG.

APPLICATION FILED JUNE 07, 1.9!8.

Reissued Oct. 15. 1918.

OZDI'NVENTOR UNIT ED STATES PATENT lorries.

ALFRED LEAND'ER RIGGS, OF PITTSBURGH, PEHNSYLVMIA, ASSIGNQR IO VISIBLE SPARK PLUG COMIAHY, A CORPORATION 011 BELA'WARE.

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Specification o1 Reissued Letters Patent.

"Beissued Oct. 15, 1918.

Original No. 1,247,012, dated November 20, 1907, Serial No. 123,923,. filed; October 5, 1916. Applicatio for reissue filed June 1'2, 1918. Serial Ho. 240,510.

To all whom it may concern:

Be it known that I, Anrnnn L. Rises, a citizen of the United States, now residing at Pittsburgh, county of Allegheny, and State of Pennsylvania, have invented new and useful Improvements in Spark-Plugs, of which the following is a specification.

This invention relates to spark plugs the object in View being to produce a spark plug in which provision is made for determining at a glance whether or not current is being fed to the electrodes or being short eircuited for any of the usual reasons.

More specifically stated, the object of the invention is to provide a spark plug in which a portion of one of the electrodes is exposed to the vision while the spark plug is in position with respect to the engine cylinder with which it is associated, enabling any one to observe in an instant whether the current is being fed to and received by said electrode.

Another object in view is to so arrange the visual portion .of the device that it is not necessary to turn the plug or any parts thereof in order to obtain a view of the exposed portion of the electrode, the view being obtained through the extreme outer end of the plug.

.With the above and other objects in View, the invention consists in the novel construction, combination and arrangement of parts, herin describech. illustrated and ciaimed.

In the accompanying drawing:-

Figure 1 is a side elevation of a spark plug partly in section, illustrating the important feature.

the same line as Fig. 2, showing a modified form of binding post.

Fig. 6 is a fragmentary section taken on the same line as the upper part of Fig. 1 showing a modified way of assembling the parts.

' Referring to the drawings A "designates lly a spark plug'f'c omprising the megenera tallic outer shell 1, the power electrode 2,

the ground electrodes 3 and the insulating core 4 which is usually of porcelain or raw hide and is formed with a central opening through which the power electrode 2 is inserted.

In the preferred embodiment of this invention, the outer end of the core 4. is formed 7 in its outer face with. an annular recess 5. A metal sleeve 6 is inserted over the end of the core a and the inner end of said sleeve is spun or otherwise inwardly deflected to. form a flange 7 which is pressed into the recess 5 and serves to anchor the sleeve 6 in fixed relationto the core 4. r

8 designates metal teed ring which is insorted into the sleeve against the outer extremity of the core 4 as shown in Figs. 1 and 6. This ring Bavhich is illustrated indetail in Fig. 4 is of the split variety, the game being divided or split along the oblique line 9 so as to form overlapping end por tions having beveled meeting faces. Inten nally the ring 8 is re ersely beveled to form.

a V-shaped portion 10 which is about in the plane of theextremity of the corresponding end of the power electrode 2 as shown in the same figures, the electrode 2 extending'at its outer end beyond the core 4:. A gasket 11 is placed upon the rin 8 and forms a cushion for a glass pane l 12 shown in the form of a disk which fits snugly within the shell 6. A packing ring 13 is placed upon the panel 12, lying against the outer face thereof. The shell 6 is then spun or pressed inwardly to' form a gutter-like retaining fiange 14 whicheverlies the packing ring 13 and serves to press said packing ring tightly againfiti't h'e panel 12, The panel 12 is thus held between two packing rings or gaskets of anydsuitable soft material which will prevent 1 factors of the panel when the plug becomes heated.

Encircling the shell 6 is a metal band 15 which, as shown in Fig.2, is split and expanded to form the complemental semicylindrical portions 16 of a binding post,

the latter being externally threaded to receive two parts of the binding .post are clamped together and the band- 15 clamped firmly around the sleeve 6. A milled nut 18 is also threaded upon the binding post and is used to clamp the current wirel (not shown) against the clamping nut 17 insure good 1 3 electrical contact.

reset outer end, means for securing said sleeve or of said sleeve.

ferrule to said core, means for attaching a conductor to said sleeve or ferrule, a spark terminal in said sleeve in conducting rela-f tion thereto and in sparking relation to the end of said electrode, and a transparent member in said sleeve outside of said terminal and closing the open end of said sleeve.

6. In a sparkplug, in combination with an insulating core provided near its outer end with a recess, and an electrode extending through said core and projecting beyond the end thereof, of an auxiliary spark attachment comprising a metal sleeve or ferrule fitting over the end of said core and open at its outer end and ,having means entering the recess in the core for securing it thereto, a spark terminal in .said sleeve or ferrule in conducting relation thereto and in sparking relation to the end of said electrode, means for connecting a conductor to said sleeve or ferrule, an a transparent member in said sleeve outside of said terminal and 'closing the open end of said sleeve.

7. In a spark plug, in combination, with an insulating core provided near its outer end with a recess, and an electrode extending through said core and projecting beyond the end thereof, of an auxiliary spark attachment comprising a metal sleeve or as rule fitting over the end of said core and open at its outer end and provided at its lower end with inturned portions engaging the recess in. the core and serving to secure the sleeve or ferrule to the core, means for attaching a conductor to said sleeve or ferrule, a spark terminal in said sleeve in. con ducting relation thereto and in sparking relation to the end of said electrode, and a transparent member in said sleeve outside of said terminal and closing the open end 8. In a spark plug, in combination with an insulating core and an electrodepextending therethrough and projecting beyond the end thereof, of an auxiliary spark attachment comprising a metal sleeve or ferrule fitting over the end of said core and open at its outer end, means for securing said sleeve or ferrule to said core, a split expansion ring insaid sleeve or ferrule and in conducting contact therewith and providing a spark terminal in sparking relation to the end of said electrode, and a transparent member in said sleeve outside of said ring and serving as a closure for and of said sleeve.

9. in spark plug, in combination with. an insulating core and an electrode extending therethrough and projecting beyond the end thereof, of an auxiliary spark attachment comprising a metal sleeve or ferrule fitting over the end of said core and open at its outer end, means for securing said sleeve or ferrule to said core, means for a taching a conductor to said sleeve or ferrule, a spar r terminal in said sleeve in conducting relation 1 thereto and in sparking relation to the end of said electrode, transparent member in said sleeve outside of said terminal and closing the openend of said sleeve, and packing rings on both sides of said transparent member.

10. In spark plug, in combination with an insulating core and an electrode extend ing therethrough and projecting beyond the end thereof, of an auxiliary spark attachment comprising a metal sleeve or ferrule fitting over the end of said core and open at its outer end, a clamping ring surround-- ing said sleeve or ferrule, a binding post 7 carried b said clam in rin for the ating relation to the end of said electrode, and a transparent member 1n said sleeve outside of said terminal and closing theopen end of said sleeve.

11. In a spark plug, in combination with an insulating core and an electrode extend- 'ing therethrough and projecting beyond the end thereof, of an auxiliary spark attachment comprising a metal sleeve-or ferrule fitting over the end of said core open at its outer end, means for securing said sleeve or ferrule to said core, a split ring fitting around said sleeve or ferrule and having its free ends extending radially and parallel to each other and threaded, clamping and conductor binding nuts in said threaded ends, a spark terminal in said sleeve in conducting relation thereto and in sparking relation to the" end of said electrode, and a transparent member in said sleeve outside said. terminal and closing the open end of said sleeve.

In testimony whereof I have hereunto set my hand.

ALFRED LEANDER ltlGlS.

Witness: W

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