US919276A - Spark-plug. - Google Patents

Description

T. WINESTOUK.

SPARK PLUG.

APPLIGATION FILED APB. 30,1909.

Patented Apr. 26,1909.

CTT

,UNITED STATES PATENT OFFIOE.

THEODOR WINESTOCK, OF STUTTGART, GERMANY, ASSIGNOR TO OTTO CHARLES WINESTOCK, OF PERKINSVILLE, VERMONT.

i SPARK-PLUG.

A Specification of Letters latc-mt.v

Patented April 20, 1909.

To all r11/tom {tf/mty concern:

Beit known that l, Trinonon l'ViNns'i-ooii, a subject of the Emperor of Germany, residing at Stuttgart, Vi'u'temberg, Empire of Germany, have invented a new* and useful Spark-Plug, of which tl le following is a specification.

lhis invention has reference to improvements in spark plugs for explosive engines, and its object is to provide a means whereby a s rark plug may be inserted or removed at wil from the explosion or ignition chamber of the' engine without the use of any tools.

, By the present invention the spark plug is made in two parts, one part being 1practically constantly fixed in the walls of tue ignition chamber, and the other part carrying both spark 'terminals the fixed part, while provision is made whereby the two parts may be locked together re movably, but so as to produce a gas-tight joint at the point of union. The locking means employed is so constructed that when the removable portion 'of the spark plug is seated in thel fixed portion thereof there is little or no tendency toward the accidental unseating or loosening of the removable seetion of the plug in its seat by any forces except those purposely applied. Furthermmc, by providing the removable member with both spark terminals it is possible to thoroughly ins ect and cleanse or repair the vital portions o the spark plug without the necessity of unscrewing the member applied to the threaded passage leading to the interior of the ignition chamber, as is necessary with the ordinary spark plugs, or those in which one terminal only is removable.

The invention will be best understood from a consideration of the following detail deA scription taken in connection with the accompanying dran-*ings forming a paft of ,this specification, in which drawings--v Figure 1 is a longitudinal section of the spark plug, and Fig. 2 is an elevation of the same.

Referring to the 'dra-wings, there is shown a member 1 in thegeneral form of a `cylindrical shell havine one end shaped into a neck 2 'externally screw-threaded to enter the screw-threaded lpassage usually provided in the walls of the ignition chamber of an explosive engine for the introduction of a spark plug. The member 1 is-'provided with a polygonal portion for the rception of a screwing it therefrom.

and readily removable from` wrench or other means of screwing the member 1 into the ignition chamber or of un- I 'lhat end of the member 1 remote from the neck 2 is formed with entering slots 3 curved until the inner ends of these slots are substantially 'concentric to the longitudinal axis of the body 1. The interior of the member 1 is formed with a cylindrical portion 4 at the slotted end, and a smaller cylindrical ortion 5 coincident with the threaded nec and between these two portions there is a conical section 6 of decreasingdiameter toward the neck 2. Both ends of the cylinder are open.

The movable member comprises a body portion 7 shown as slightly longer than the fixed member 1 and conforming in exterior contour to the shape of the member 1. At diametrically opposite points the body 7 of they movable member has screwed into it radially-projecting pins 8, each of which is protected by an insulating cap 9 constituting a handle by means of which the movable member may be mani iulated. The pins 8 are of such diameter am the insulating caps or handles 9 are so spaced from the body 7 that the pins 8 may be caused to enter the open ends of 1the slots 3, the said slots boing diametricall f disposed in the cylindrical or fixed mem er 1 and then by turning the body portion 7 on its longitudinal axis, the said body portion will be forced into the member 1 until the intermediate conical portion 10 of the body 7 is'in intimate cont-act with the conical seat 6, the parts being locked together by the concentric portions of the slots 3.

Extending longitudinally through the body 7 of the movable or removable member is a centralboi'e 1.1, and this bore. is 'counterbored, as indicated at 12, for a )ortion of its length from the smaller end of t e body portion. The central borel 11 hasy in it an insulating sleeve 13 extending beyond the wide end of the bod).T portion 7, and also at the other end entering the counterbore 12. Within the said counterbore is vanother insulating member lil, and beyond the wide end of the body portion 7 is insulation 15. The insulating member 14 is ol' suliieient length to extend beyond the small end of the body portion 7. p

Extending centrally through the insulating members 11, le and 15, is a metallic rod 16 terminating at one end in ahead 17 and at the other end in a screw-threaded portion 1S.

Between the head 17 and the insulating t sary to remove the plug the operator has but member 14 there is confined a disk 19 having on oneside an annular crown of teeth 2'0'directed toward the end face 21 of the small end of the vbody ortion 7. The screwthreaded end 18 of t e rod 16 receives a number of nuts 22 and also a thumb nut 23 such as is commonly employed upon binding posts.

The insulating members 11, 14 and 15 may be formed of any suitable insulating material caV able of standing up under com aratively 'gh electric pressures, While the msulating sleeve 14 should alsobe of refractory material. An excellent insulating material, which is also highl refractoi is mica and the insulating mem vers 14 an 15 can', therefore, be made u ofsuperposed washers of mica While the s eeve 11 may be madonp of mica composition or mica disks. When the insulating members are made of suitable insulating material other than mica they may be suitably molded into shape, and the sleeve' 11 may be inset into both the members 14 and 15 to prevent danger of leakage of current at the' joints. In the case of mica the insulating material may be suitably builtup of disks of proper shape.

One circuit terminal is connected to the rod or stem 16 by clamping the end of the conductor between the thumb nut 23 and the outer one of the nuts 22, thesaid nuts 22 serving as both clamping and lock nuts. The other circuit terminal may be connected to the enginev body at any a ropriate point after `the usual practice. @he s ark then passes between the teeth 2() andt e annular end 21 of the body 7. By this means there is little or no danger of choking or 'short circuitingv at the spark terminals since there are a large number of pointsl for the sparks to pass, and should one become burned off others remain and so the life of the terminals is much prolonged. It is found that the disk 19 will 'successfully operate when made of 'c German silver.

@seated in the fixed member 1. tion ofthe slots 3, which are suitably shaped for this purpose, Will so firmlys'eat the 'movable member in the fixed member that the joint is rendered gas tight, even under the high pressures generated in the explosion chamber'when the charge is fired. This is easily accomplished by properly grinding the l meeting surfaces ofthe cones of the movable and fixed members. When it becomesneces- The cam acto app y a twisting force to the handles 9 in a direction at right angles to the longit'udmfl axis of the plug and the movable member is immediately forced out of its seat and may then be lifted from the open ends of the slots 3, no tools of any kind being necessary fOl this purpose. that the movable member of the plug carries both spark terminals and, therefore, inspec-v tion or repair of the vital portions of the spark plug is possible without the necessity of removing any parts by means of tools. Furthermore, the fixed member may be propcrl packed against leakage when irst putin place and need not, therefore, be disturbed.

What is claimed is It is to be further observed 1. A spark plug comprising a fixed ,lllelll-4 ber .provided with open ended cam slots terminating at their inner ends in plane porl`- tions concentric with the longitudinal axis of the said fixed member and( extending entirely through the Walls of the fixed member throughoutV their length, and a removable member carrying both terminals of the spark circuit and provided with lmeans for engaging the Walls of the cam slots to be thereby 'seated and locked in the fixed member when the engaging means are in the plane portions ofthe said cam slots, the said engaging means on the removable member extending entirely through the said cam slots and there provided with manipulating handles.

2. A spark plug comprising a fixed 111cm.E ber composed of a cylindrical body having a threaded neck at one end, and open-ended cam slots at the other end, said cam slots en tering said 'end of the cylindrical body, and then curving and ending in plane portions concentric with the longitudinal axis of the vcylindrical body, the latter being also provided with an. interior conical seat, and aremovable member having a conical portion adapted to said seat and carrying both spark terminals, said removable member also be-v ing provided withA handles having yportions adapted to enter the cam slots, and to engage the Walls of the latter toseat the'removab o member in the fixed member and to lock the two together when the handles are in the plane portions of the said cam slots.

3. A. spark plug comprising a cylindrical member aving a threaded neck at one end and an interior conical seat, and at the other end having open-ended camslots entering the said end of the cylindrical member and then curving and ending 'in plane portions concentric with the longitudinal axisof said cylindrical member, a removable member composed of a body portion having a conical section adapted to the conical seat in the fixed member and also provided With a longitudinal central passage, radial pins carried by the body of the removable member and adapted to enter the slots of the fixed memllO ber and locking in the plane portions'of the In testimony that vI claim vtbe foregoing s said slots, e conducting stem central to the my own, I have hereto affixed my slgnature removable member and insulated therefrom, in the presence of two witnesses.

A means for locking saidstem to the removable i THEODOR VVINESTOCK. 5 member, and a circuit terminal carried by Witnesses:

the stem in operative relation to the inner L KARL WE'rNsTooK,

end of the v body of the removable member. e EUGEN SfrooKER. v

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