US1318391A

US1318391A - William j

Info

Publication number: US1318391A
Authority: US
Publication date: 1919-10-14
Anticipated expiration: 1936-10-14

Description

"wLF. LAUGHRAN AND i 0. ALAmE.

SPARK PLUG. APPLICATION FILED JULY 18,1916.

Patented Oct. 14,1919.

WILLIAM r. Laueneeu Ann GATE-THIRD re LAN earner G. ALARIE, OFTRGY, NEW? YORK, ASSIG-NORS 01E Hil -ill. A. LEE, OF TROY, NEW YORK.

itpecification of JtcttersPatent.

Application filed July 1%, 1916. Serial No. 109,874.

To all whom it may concern:

Be it known that we, Winonar l LAUGH RAN and FRANK C. Amara, citizens Or the United States, residing at Troy, county of to efiectivel test the action of a s arlr lu a while-in use.

Figure 1' of the drawings is a view in side elevation of a sparlcplug embodying our invention.

Fig. 2 is a central cross-section taken through the axis of the plug.

wire-holder outside Referring to the drawings wherein the invention is shown in preferred form, 1, is a wire-holder of porcelain or other insulating material containing two

Wires

2 and 3, terminating in adjacent points at the inner end oi the sing at e.

The wirei mounted within a casing eeve and a bushing sleeve 6, scr the outer end of the sleeve 5.

The inner en T of the sleeve is screwthreeded a similarly threaded. sparkplug-apertui an engine-casing 8, in connectionwith the cound side 9, of an electrlc circuit,

The colder an annular shoulder 10, which seugaged bushing 6, to securely clamp the wire-holder in position within the wire-holder-casing.

' The wire 2, extends entirely through the Wire-holder 1, and has an outwardly proj ecting end 11, adapted to he connected with the other side 12, of said electric circuit.

The wire 3, extends only part-way longitudinally through the wire'holder, and has its outer end 13, projecting laterally through, and exposed upon one side of, the

of the wire-holdercasing.

A metal sleeve 14 is slidably mounted upon the wire-holder 1, outside of the wireholder-casing, and in contact with. the laterally projecting end 13 of the wire 3.

The sleeve 14, has a handle 15, fixed thereon, whereby it can be adj ustably moved toward and from the bushing 6, forming part of the wire-holder-casing, which adustment may be accomplished by a direct movement of the sleeve longitudinally of the wirel1older, or by a spiral movement of the sleeve.

The sleeve has on its inner end a contactpoint 16, which can by such adjustment of the sleeve be brought into contact or engagement with the bushing 6, or more or less separated from the bushing 6;

In the normal operation of the plug the sleeve 14-, is adjusted with its contact-point 16, hearing against the bushing 6, thus electrically connecting the wire 3, through the sleeve 14, bushing 6 and sleeve 5, with the engine casing 8, which is in electrical connection with the ground side 9, of the electric circuit. 7

When it'is desired to test the action of the plug, the sleeve 14, is moved slightly outward, along the wire-holder 1, until its contact-point 16, is slightly separated from the bushing 6, whereupon if the plu is in proper workin condition a spark will be seen between lie contact-point 16, and the bushing 6. If no spark passes, it indicates that no spark is being formed between the wire points at 4. It will be seen that the passage of the electric current is thus tested on the ground side of the circuit with respect to the points 4, so that the presence of a spark between the point 16 of the sleeve 14, and the bushing 6, indicates that the current has jumped over the gap between the points 4, maklng a more certain test than where the test is made on the positive side of the circuit, with respect to the points 1, in which latter case various short-circuits to ground would permit the current to pass the testing device without passing between the pointsat 4.

What we claim as new and desire to secure by Letters Patent is:

A spark-plug comprising a wire-holder of insulating material; a metal casing for the inner portion of the wire-holder adapted to engage a spark-plug-aperture in an enginecasi'ng in' electrical connection with the ground side of an electric circuit; two wires in said wire-holder, terminating in adjacent points at the inner end of the plug, one of said wires extending longitudinally through the holder and having an outwardly pro- ;Patclnted @ct. 1d, 1919.

jectin end adapted to be connected with the ot er side oi said. electric circuit, the other of said-wires having, its outer end pro j ecting laterally through, and being exposed upon one side of the Wire-holder outside of said wire-holder-casing; and a metal sleeve movably mounted in contact with said laterally projecting exposed end of said lastnamed wire on the wiredwidee omeide of said wire-holder-casing, and movable into 11) and out of contact withseid metal-causing. In testimony whereof We have hereunto set'our hands this 10th day oi July, 1916.

WILLIAM F, LAUGHEAN. FRANK. o. Amem.