US1400525A - Spark-plug - Google Patents

Description

G. CHRISTEHN. A

SPARK PLUG. APPLICATION FILED Nov. 17, |919. RENEwEn JUNE 7,1921.

Patented Dec. 20, 1921.

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INVENTOR Graz/er BriJcrw, v

its ATTORNEY lUNITI-:D STATES GBOVER CHRISTERN, OF NEW YORK, N. Y.

SPARK-PLUG.

Application led November 17, 1919, Serial No. 338,607.

To all whom t may concern Be it known that I, GRovER CHius'rERN, a citizen of the United States, and a resident of the city of New York, county of Bronx, and State of New York, have invented a certain new and useful Improvenient in Spark-Plugs, of which the following is a specification.

This invention relates to an improvement in spark plugs of the type generally used in internal -combustion engines. One of the objects of this invention is to provide an article of this character having adjustable or regulatable electrodes by means of which the space between said electrodes or points may be readily adjusted or altered to compensate for wear or when desired, the points may be readily engaged or separated to such an extent as to conveniently permit the removal of any carbon or oil deposit which ma lodwe between the points, and thereby inci entally removing any excrescence which may become settled in the electrode.

These objects, and other objects which hereinafter appear in view, I have devised the particular arrangement of all parts hereinafter set forth and more particularly pointed out in the claims appended hereto.

Reference is to be had to the accompanying drawings, forming a part hereof, in which- Figure 1 is a vertical sectional elevation of a spark plug provided with my improvement.

Fig. 2 is a side elevation of the same.

Fig. 3 is a plan View of the same, and

Fig. 4 is a sectional view of the lower end of the lug showing the manner in which the points engage and are cleaned by contact with one another.

Throughout the various views of the drawing, similar reference characters designate similar parts.

In the preferred embodiment of my invention, as illustrated in the accompanying drawing, 1 indicates the usual metal body of the plug which may be of the usual or desired form and which is provided with the conventional screw threads 2 by means of which the same is threaded into the spark plug opening in an engine cylinder. At the lower end of the spark plug body is a cross member 3 which forms one of the electrodes and which is rovided with a central conical opening 4. lllounted in the body Specification of Letters Patent.

Patented Dec. 20, 1921. Renewed June 7, 1921. Serial No. 475,831.

of the plug is the insulating material 5A which is usually of mica, porcelain or the like. Extending vertically through the center of the insulating material 5 is a tubular member 6. This tubular member is threaded, as at 7, on its upper end and on its lower end it is provided with a circumferential flange 8 which fits snugly into the flared mouth 9 of the insulator 5 at its lower end. The tubular member 6 is held tightly in place within the insulator 5 by the coperation of the flange 8 on its lower end and a washer 10 and a nut 11 threaded upon the screw threads 7 on its upper end. The washer 10 and nut 11 are covered by a cap 12 which passes over the upper end of the tubular body 6 and 13 on the insulator 5. Threaded upon the upper end 'of the tubular member 6 is a bushing 14 provided inwardly extending projection 16 on its upper edge. Slidably mounted within said bushing 14 is a disk 17 having an upwardly extending conical projection 18 which is provided with a slot 19 for engagement by driver or other implement, whereby the disk 17 may be rotated within the bushing 14. Attached to the disk 17 and extending downwardly therefrom, is the central electrode or spark plug point 2() which is in the nature of a rod and which passes through the tubular member 6. At its lower end this electrode 20 is provided with the plug point 21 which is preferably diamond shaped, as shown, or may be of any desired or suitable contour. A spring 22 is mounted within the bushing 14 and tends to exert an, upward pressure upon the under face of the disk 17. Said disk 17 is limited or restricted in its upward movement by reason of the engagement of the projection 16 on the bushing 14 with the upper face of the disk 17. This disk 17 is provided with a number of recesses 23. I have shown three of these recesses in the drawing, but it is obvious that this number may be varied according to requirements. It will be seen that when the projection 16 registers with one of these recesses 23 it will lit thereinto, and the point- 21- on the central electrode 2O will be nearer or farther away from the electrode 3 according to the depth of the recess 23 in which the projection 16 fits. These recesses 23 are therefore made of varyrests upon a shoulder' with a base 15 and an ion points is regulated by the depth ofthe parpoints of the plug, a screw driver is inserted into the slot 19 and the disk 17 vis pressed downwardly until the projection 16 moves out of engagement with the slot into which it is resting. Then the disk 17 is rotated until the projection`16 comes into registration with the recess of desired depth when pressure on the screwdriver is released and the spring 22 forces the recess 23 into en ga ement with the projection 16.

Fn Fig. 4 is shown the manner in which the points of the plugs are cleaned. When the conical opening 4 in the electrode 3 becomes clogged or corroded, the electrode 20 is pressed downwardly until its diamond sha ed point 21 enters the conical opening 4. Iiy then rotating the electrode 20 the opening 21 is cleaned by the point 21 as disclosed in Fig. 4.

From the foregoing it is obvious that my invention is not to be restricted to the exact embodiment shown, but is broad enough to cover all structures coming within the scope of the annexed claims.

Having described my invention' what I claim is:

1. An article of the classdescribed com- 'prising a spark plug having' a xed electrode, a movable electrode having an end adapted to be brought into contact' with the fixed electrode and rotated while in contact therewith to clean the same, a disk fixed to theupper end of said electrode having a plurality of recesses of varying depths, and a projection on the plug adapted to be brought to rest in any one of said recesses by rotation of the movable electrode.

2. An article of the class described comprising a spark plug having` a xed electrode, a movable electrode vertically movable through the plug and adapted to be brought into contact with the fixed electrode and rotated while in contact therewith to clean the same, a disk fixed to the upper end of said electrode and rotatable with the same, a bushing in which said disk is rotatable, said disk having a plurality of recesses of varying depths and an inwardly extending projectlon on said bushing adapted to be brought to rest in any one of said recesses by rotation of the movable electrode.

Signed at the city of New York, county of and State of New York, this 11th day of November, 1919.

GROVER CHRISTERN.

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