US1266009A - Spark-plug. - Google Patents

Description

Patented May14,1918.

wir/155555 UNITED sTATEs PATENT oEEIoE.

FRANK GARACA, 0F IBESSEMER, ALABAMA.

SPARK-PLUG'.

vide spring means engaging one of the elec-- trodes and tending to force the same toward the other electrode.

A further object of the invention is to provide means for moving the electrode longitudinally to compress or expand the spring.

Another object of the invention is to provide a device of this character, which is simple and durable in construction, reliable and eflicient in operation and one which can be manufactured and placed upon the market at a minimum cost.

The invention also consists in certain other features of construction and in the combination and arrangement of the sev-A eral parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed outyin the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings, wherein like characters denote like or corresponding parts throughout the several views, and in which:

The ligure represents a longitudinal sectional view through the spark plug.

In this figure, l represents the outer metal shell of the plug provided with thg usual screw threaded lower end for engaging with the screw threaded hole in the cylinder` top. 2 represents the porcelain body held in the shell by means ofthe packing nut 3.. 4 represents a movable electrode'whichis in the form of a rod passing longitudii ally through the body 2 and provided with the screw threaded upper end which is adapted to receive the nut 5 and the binding Specification of Letters Patent.

Application led .T une 20, 1917. Serial No. 175,914.

Patented May 14, 1918.

tap 6. lne lower end of the rod `yl is pro- .vided with a collar 7 and a coil spring 8 surrounds the rod and bears against this -v collar, the porcelain body 2 having a recess 9 in its lower end for receiving said spring and collar. A washer 10 ts in the bottom of this recess and has an openin therein through which the rod 4 passes. T e spring 'is compressed between this washer and the collar 7 and tends to force said collar and the rod downwardly, but this movement is prevented by the nut 5 engaging the top of the body 2, so that by adjusting this nut the position of said rod may be regulated; 1l indicates the stationar electrode secured to l the lower end of the s ell 1 as usual.

It will be seen that the spring tendsto move the end of rod 4: into contact with the end of the electrode 11 so that the space between the electrodes is adjusted by means of the nut 5.

It is thought from the foregoing that the advantages, and novel features of my invention will be readily apparent.

I desire it to be understood that I may make slight' changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of 'the appended claims.

I claim as my invention:

l. A spark plug comprising a shell,'a

porcelain body secured therein and having a vrecess in its lower end, stationary and .movable electrodes, means for adjusting the movable electrode, with relation to the stationary electrode, andyieldable means associated with said movable electrode and adapted to lbe arranged in said recess.

2. A spark plug :comprising a stationary and movable electrode, said movable elec. trode consistin of a rod passing through the body of tlre plug, said rod having a screw threaded upper end, a nut engaging said end and bearing against the top `of the plug, a collar on the lower end of saidrod and a spring compressed between said collar and a part of the plug.

3. A spark plug comprising a s hell'and a porcelain body held therein, said body having a recess in its lower end, stationary and movable electrodes, said movable electodes consisting of a rod passing through the body and through said recess, said rod having a screw threaded upper end, a, nut engagng with said upper end, a collar on said rod and a coil spring in the recess and engagng said collar.

FRANK GARACA.

Witnesses:

W. C. BATY, E. E. WILSON.

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