US1116238A - Spark-plug. - Google Patents

Description

H. J. BUTLER & L. P. CASPER.

Patented Nov. 3, 191 i WITNESSES ATTORNEYS UNITED STATES PATENT OFFICE.

HARRY J'. BUTLER AND LOUIS P. CASPER, OF LOUISVILLE, KENTUCKY.

SPARK-PLUG.

To all whom it ma concern:

Be it known t at we, HARRY J. BUTLER and Louis P. CASPER, citizens of the United States, and residents of Louisville, in the county of Jefierson and State of Kentucky, have invented a new and useful Improvement in Spark-Plugs, of which the following is a specification.

Our invention is an invention in spark plugs for use with explosive engines or the like, and has for its object the provision of a plug of the character specified, wherein the electrodes or sparking points are so formed that deposits of carbon and the like cannot accumulate on the points or electrodis, thus preventing the passage of the s ar In the drawings :-Figure 1 is a vertical section of the improved plu on the line 11 of Fig. 2, Fig. 2 is a si 6 view of the plug, Fig. 3 is a bottom plan view, Fig. 4 is a side view of the insulator, Fig. 5 is a side view of one of the electrodes, Fig. 6 shows'two views at right angles to each other the vibrating .or moving part that contacts with the electrodes, Fig. 7 is a view similar to Fig. 1 of a modified form of construction, Fig. 8 is a bottom plan view of Fig. 7 Fig. 9 is a side view of the insulating member of the construction shown in Fig. 7, Fig. 10 is a side view of one of the electrodes of the said construction, ind Fig. 11 is a, plan View of the ball.

In the embodiment of the invention shown in Figs. 1 to 6, the improved plug consists of a tubular nipple or holder 1, reduced and externally threaded at its lower end as shown at 2 for engaging an opening in the engine and internally threaded at its upper end to receive a )acking nut 3 for holding the insulator 4, t e said insulator being of porcelain or other non-conducting iiiatei-ial, having a central opening for a purpose to be mentioned later, and having intermediate its ends an annular enlargement ti, engaged by the packing nut 3 to hold the insulator in place in the holder 1.

n o F q A cylindrical nipple or extension 7 is pro vided at the upper end of the insulator 4. i

and the lower end is recessed as shown at 8 to receive the movable member 9 shown in Fig. 6. It will be note-d fr m an inspection of Fig. 4 that the recess 8 is longitudinal to the insulator 4, and that the lower end is conical -or trumpet-shaped, while at the up Specification of Letters Patent.

per end oppositely arranged bearing depress ons 10 are provided for receiving the trunnions 11 of the movable member 9. (The member 9 is thus mounted for swinging movement in the recess 8, swinging on the trunnions 11, and the lower bulbous ortion 12 of the movable member extends be ow the lower end of the insulator 4 and is adapted to engage alternately the adjacent ends of the electrodes.

One of the electrodes 13 is in the form of a rod havlng its upper end threaded and having at its lower end an enlarged elbow 1 1. The body of the electrode 13 passes through the opening 5 of the insulator the elbow 14 being below the-lower end 0 the insulator. A shoulder 15 is formed at the unction between the elbow and the body othe electrode for engaging the lower end oi the insulator to limit the upward movement of the electrode. The upper end of the electrode extends above the nipple 7, and nuts 16 and 17 are threaded on to the electrode above the insulator. The usual ring 18 eon nected with the end of the cable or conduc tor that leads from the magnet-0 or battery to the spark plug encircles the. electrode 13 between the nuts 16 and 17, and the nut 16 is provided in its lower end with a recess for receiving the nipple 7. The other electrode 19 is of usual form, being in the shape of an elbow extending longitudinally from the lower end of the holder 1.

In operation, the current passes from the magneto or battery through the electrode 13 and the elbow 14 to the electrode 19 and Patented Nov. 3, 1914.

Application filed November 4, 1912. Serial No. 729,459.

through the engine to the ground. The

bulbous portion 12 of the movable member 9 is between the adjacent ends of the elbows 14 and 19 and the said member is free to swing from one of the electrodes to the other. when the bulbous portion 12 is out of 'ontact with either electrode, a

In the constructions shown in Figs. 7 to 11, the holder 20 is in all respects the same i the holder 1, lmi-ing the reduced ext rnal threaded portion 21 for engaging the openvided with an annular enlargement or rib 24 intermediate its ends, and it will be noticed that in both constructions the upper ends of the holder 1 and 20 are enlarged annu'larly to form an annular shoulder against which the lower face of the rib 24 may rest.

he packing nut 22 engages above the rib 24 to hold the insulator in place and the upper end of the insulator is provided with the cylindrical nipple 25, corresponding to the nipple 7. One of the'electrodesv is in the form of a rod 26 having at its lower end a head 27, and the rod passes through a longitudinal opening in the insulator, the head limiting the upward movement of the electrode. Packing nuts 28 and 29 are threaded on to the upper end of therod and the ring 30 of the conducting cable-is held between the said nuts. The lower end'of the nut 28 isrecessed longitudinally to re- .,'ceive the nipple 25.

The electrode connected with the holder 20 is in the form of an elbow 31, and the head 27 and the inner free end of the elbow 31 are directly opposite each other. The lower end of the insulator is provided with a transverse circular opening, as shown at 32in Fig. :9, and thexhead is at one side of the'said o enin extending into the same, while the el ow, llextends into the oppossite side. A ball 33 of conducting material (Fig. 11) is arranged between the lower end of the two' electrodes, the said ball being freely movable in the opening 22 between the headand the elbow. q 7

-In the construction of. Figs. 7 to 11 the ball 33 acts in the same manner as the 3 bulbous portion 12 of the member 9 and the same result is attained.

ve claim:-- I

l 1. A spark plug comprising a tubular holder, having means for engaging an engine, an insulator of approximately cylindrical form in the holder, means for connecting the insulator to the holder, said inelectrode in the opening and extending beyond the insulator at both ends, the lower end of the electrode having an angular lug and the holder'having a lug opposite the lug of the electrode, and a member of con ducting 'fnaterial supported by the insuwith respect thereto.

electrode extending longitudinally of the holder, an insulator between the electrode and theholder, said insulator having a re cess extending transversely between the electrode and the holder, and a movable member of conducting material within the recess and supportedby the insulator and movable freely 7 between the electrodes, whereby to contact with either electrode.

3.' A spark plug having laterally spaced trodes being spaced apart laterally from each other, and a member of conducting and mounte for free lateral movement between .the saidterminals,

4. A spark plug having electrodes whose terminals are spaced apart laterally from each other, and a movable 'member1 supported between 'the electrodes' and mounted for free lateral movement to contact with either electrode. y A

HARRY J. BUTLER. I LOUIS P."CASPER. Witnesses:

ALBERT A, PLocK, J. W. G. HUGHES.

lator between the lugs and freely movable 2. A spark plug comprising a holder, an

electrodes, the terminals of the said elec material su ported between the terminals i s'ulator having a longitudinaL-opening,an

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