US772856A - Sparking plug for combustion-engines. - Google Patents

Description

No. 772,856. PATENTED OCT. 18, 1904.

G. H. WISNER.

SPARKING PLUG FOR COMBUSTION ENGINES.

APPLICATION FILED JULY 24. 1902.

N0 MODEL.

WI NESSES INVENTOR K 9. a. //m

Attorneys.

Patented October 18, 1904.

UNITED STATES PATENT @EETQE.

CHARLES H. WISNER, OF FLINT, MICHIGAN, ASSIGNOR TO PETER P. G. HALL, J R.

SPARKING PLUG FOR COMBUSTION-ENGINES.

SPECIFICATION forming part of Letters Patent N0. 772,856, dated October 18, 1904.

Application filed July 24, 1902. Serial No, 116,766. (No model.)

To all whom it may concern:

Be it known that 1, CHARLES H. WIsNER, a citizen of the United States, residing at Flint, county of Genesee, State of Michigan, have invented a certain new and useful Improvement in Sparking Plugs for Combustion-Engines; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to sparking plugs for explosive-engines, and has for its object an improved plug in which there is contained a chamber arranged to retain a portion of the burned gases, which retained portion serves as a protection to prevent the deposit on the insulating material of carbon resulting from imperfect combustion in the chamber.

In the drawings, Figure l is a longitudinal section of the plug with the sparking electrode connected therewith. View as seen by one looking toward the sparking end of the electrode.

The plug A is threaded to fit a threaded opening in the cylinder B. The head of the plug is bored out and threaded to form a cavity 2, which is larger in diameter than abore 3, concentric with the bore of cavity 2, and the cavity 3 is extended through the stem 4 of the plug. Preferably the base is somewhat eccentric to the body of the stem or to the true center of the stem 4, but accurately concentric with the bore of the cavity 2.

The cavity 2 has a seating-surface 5 above the extreme bottom of it, and a portion of the cavity concentric with the seating-surface 5 forms a shallow chamber between the insulating-disk hereinafter spoken of and that part of the material which forms the stem 4 of the plug and forms the web 6 between the stem L andthe walls 7, which surround the cavity 2. The walls of the cavity are internally screw-threaded, and a threaded nipple 8 is run into the threads in the walls of the Fig. 2 is an end cavity and holds between its inner end and the seating-surface 5 a disk of insulating material 9, preferably of sheets of mica. The disk of insulating material 9 is centrally perforated, and through the central perforation extends thescrew-stem 10 of an electrode 11. A hollow piston 12, fitted with a suitable binding-screw 13, is screwed onto the stem 10. An electrode-point 14 is made fast to the stem 4 of the plug and arranged to be brought into proper adjustment with the extreme point 15 of the electrode.

The disk 9 is round, and the body of the electrode 11 in the center of this disk is quite accurately adjusted along the center line of the bore 3 through the stem, and the terminal 15 of the electrode is always accurately centered with respect to the bore 3, so that the electrode may be-brought in its proper position without difficulty in assembling the parts.

The nipple 8 holds the insulating-disk 9 in place, and there is a shallow Wide chamber extending over the inner surface of the insu-v lating-disk at the bottom of a bottled chamher or cavity through which the electrode projects. The electrode itself is insulated by a broad air-space from all the metallic parts of the plug and is held with perfect insulation by means of the mica disk.

After one explosion in the engine has taken place a fresh charge is introduced, entering the chamber as the piston is withdrawn. That part of the exploded gases which was in the cavity does not entirely leave the cavity. The combustible fresh charge does not reach the bottom of the cavity, although under compression enough of the fresh charge does extend into the cavity beyond the extreme end of the electrode 11 so that the spark-gap is at all times in the rich combustible gases, while acushion of burned gases lies at the bottom to prevent combustion from extending deep enough into the cavity to coat the mica disk 9. Should the first layer of mica become burned, as will sometimes happen to mica under high heat, the plug can easily be repaired by sealing off the burned sheets and, if necessary, adding additional sheets to the rear to produce a disk of requisite strength to resist explosion. Vhile the air in the inner end of the plug is more or less disturbed, the residual gases of the previous explosion being more or less replaced by combustible gases, the location and shape of the shallow chamber prevents the displacement of the incombustible gases contained therein, and thus prevents the formation and deposition of soot or other matter liable to form a conductingfilm on the walls of said chamber.

The shape of the plug is such that while the part which passes into the cylinder may be made of the average size'say that of a threequarter-inch gas-pipe-the outer port may be made large to afford a large amount of insulating material between the electrodes and a considerable extent of surface.

The simplicity of the construction and the small cost incident to its construction will be obvious and the ease with which it may be taken apart and put together.

What I claim is 1. Asparkingplugforcombustion-engines, provided with an outwardly-extending passage opening into the cylinder, a second passage larger than the first passage forming an outward extension of the same, a raised shoulder on the surface of said plug between the ends of said passages, said shoulder surrounding the inner end of the first-mentioned passage at a distance therefrom, a disk made up of one or more sheets of mica resting upon said shoulder, means for holding the mica, and an electrode secured to said disk and extending along said passage.

2. A sparking plug for combustion-engines, provided with an outwardly-extending passage opening into the cylinder, a second passage larger than the first passage forming an outward extension of the same, a raised shoulder on the surface of said plug between the inner ends of said passages, said shoulder surrounding the inner end of the first-mentioned passage at a distance therefrom, a disk of insulating material having a flat inner surface resting upon said shoulder, and an electrode secured to said disk and extending along said passage.

3. In a sparking plug for a jump-spark system of ignition for combustion-engines, the combination of a plug containing a chamber and a comn'iunicating passage between said chamber and the interior of the engine of smaller diameter than the chamber, an insulated electrode arranged to extend through the chamber and through the passage and to terminate near the extremity of said passage, a second electrode arranged in proximity to the first with an intervening gap, substantially as described.

4. In a sparking plug for gas-engines, the combination of a plug having a passage through the stem thereof, a cavity in the head of said plug of larger cross-sectional area than the stem-passage, an electrode, a disk of insulating material, means for holding the disk in position closing the end, and spaced from the bottom of the cavity in the head of said plug, said electrode being supported by being secured in said disk, said electrode being ar ranged to extend through said cavity into said passage and toward the inner end of the latter and a second electrode arranged in proximity to the first with an intervening gap.

5. An igniting device comprising a terminal supporting-standard, an insulating-plate to which said standard is secured, a tubular member surrounding said standard and a flange connected to said tubular member and provided with a recessed portion adjacent said plate, and means for holding said insulatingplate against said flange but free of its recessed portion.

6. An igniting device comprising a tubular plug adapted to enter the wall of an enginecylinder and formed With an enlarged chamber communicating with its bore exterior of such cylinder, a metal firing pin passing through such bore and into said chamber and insulating material interposed between said pin and the wall of said chamber entirely exterior of such cylinder.

7. An igniting device comprising a tubular plug adapted to enter the wall of an engine cylinder formed with an enlarged chamber communicating with its bore exterior of such cylinder, said chamber having an aperture in its wall and a metal firing-pin passing through said plug and spaced away from the walls thereof, and insulating material in said aperture and surrounding said pin, said insulating material being wholly exterior of such cylinder.

8. A sparking device for explosive-engines comprising a tubular electrode, having bores of different diameter, a piece of insulating material across the larger bore for closing the same and arranged at a distance from the bottom thereof, and an electrode supported by said material and arranged in proximity to the inner end of the tubular electrode.

9. Asparking plug for a combustion-engine containing a chamber, a communicating passage between said chamber and the interior of the engine of smaller diameter than the chamber, an insulated electrode arranged to extend through the chamber and through the passage and terminating near the extremity of said passage and a second electrode arranged in proximity to the first.

LOO

10. A sparking plug for a combustion-engine comprising a chamber exterior of the engine, a communicating passage between said chamber and the interior of the engine of smaller diameter than the chamber, an insulated electrode arranged to extend through the chamber and through the passage and terminating near the extremity of said passage and a second electrode arranged in proximity to the first. 10

In testimony whereof I sign this specifica tion in the presence of two Witnesses.

CHARLES H. WISNER. Witnesses:

'LoTTA LEE HAYTON,

ELLIOTT J. STODDARD.

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