US1353657A - Spark-plug intensifier - Google Patents

Description

R. E. HILDEBRAND. SPARK PLUG INTENSIFIER. APPLICATION FILED JAN. 29, I9I7.

' in detail, illustrated in the drawing and ,more particularly pointed out UNITED STATES PATENT OFFICE.

RICHARD E. HILDEBRAND, OF CHICAGO, ILLINOIS.

SPARK-PLUG INTENSIFIER.

Specification of Letters Patent.

Patented Sept. 21, 1920.

Application led .January 29, 1917. Serial No.'145,043.

provements which will make the intensifving spark more certain or dependable by multiplying the pointsfrom which the spark may jump; by obviating variations in the sparkgap due to vibrations and burning away of wire electrode points, and by providing a more stable construction generally than heretofore. Another object of the invention is to provide improved means for detecting spark plug troubles and to protect same against the elements. foreign Substances, etc.

'ith the above-named general objects in view my invention consists in the. novel construction, combination Iand arrangement of parts, all as hereinafter described more fully accomlmnymg in the appended claims.

In the drawing- Figure l is a vertical section through a. spark plug with my improvements applied thereto.

Fig. 2 is a section taken .substantially on the, line 2 2 ol' Fig. l.

Fig. 3 iS a perspective view of the protective hood for the inlensilier attachnn-nt. together with the protected parts separated. Fig. A't is a modification o l' Fig. 2. A

Fig. 5 is a. section taken substantially on line 5-5 Fig. 2.

Fig. 6 is a .section taken on the line 6-6, Fig. 1.

ln the several views 2 represents a well known form of spark plug-comprising an interiorly threaded lower section il with exterior threads 4 to he engaged with a threaded engine bore, and an upper section 5 carrying a. porcelain insulator. 6, i' and 8 are the usual electrodes or tiring points and 9 an exteriorly threaded bushing having screw threaded engagement with the section 3 and bearing against a flange l on the lower jump tb the central nut -engine hood. whether end of the section that is seated on antannnlar shoulder 11 on the section 3. The upper end of the electrode wire? is a threaded portion 12 on which are' nuts 13 and 14 holding therebetween a disk of insulation 15 and a similar disk of metal 16, with the difference that the disk 15 has a small bore 17 for the wire 12 while the disk 16 has a larger opening 18 therein from the edge of which a spark, or a series of sparks, may '13 and the electrode wire 12, 'i'.A In Fig. 4 this jump-spark edge takes the form of a saw-tooth edge 19 which provides a large number of individual points trom which sparks may jump to the central electrode wire. -In the peripheries of the disks 15 and 16 arey cut notches 20 and 21 which permit the passage of flanges 22 and.

23 on the edge of an approximately semisphcrlcal glass hood 24. By turning the hood atter the 'passage of its flanges through the cnt-out portions 2() and 21 the flanges are engaged with the under side of the disk 15. An annular flange 25 above the segmental flanges 22 and 23 engages the upper side of the disk 16. The disks 15 and 16 are provided with projections 0r extensions .26 through which is a bore 2T that is engaged by a bolt or post 28 on which is a knurled nut 29 and a nut 30 between which is clamped the end of a wire 31 that conducts current. to the disk 16. In the horizontal plane of the flanges 22 and 23 the hood 24 has' a cnt away portion 32 that clears the extension 26.

The. above described invention is an improved spark intensifier and spark trouble detector` all combined in a single plug niemler. The edge of the vdisk 16 provides a -multiple spark gap at which may be noted on the exterior of the engine` b v lifting the or not theplug is operative at the ignition gap within the cngine cylinder. The smooth edge 1S 0r saw edge 19 provides an indefinitemnnber of spark gaps from which a number of sparks may radiale lo the. central nut. which intensities the action of the intensifying gap. which is to produce a static current and an induced current which does not seek a short circuit` but is forced to the' gap at the the4 sparking ignition end of the plug. la-tter gap the spark is ch-anged from the usual yellow toa much hotter blue flame which tends to keep the plug and cylinder AgA soot, carbon, grease, or broken porcelain,-

prevents the widening of the ordinary gap from jerks and vibrations in thel machinery,

and the increased spark 'power obv1ates trouble from flooding the engine with oil-L the plug firing evenly though covered with oilor packed with grease.

Theconveniently attachable and removable lass hood rotects the' plug terminals and insulation rom water and'oil and thereby helps to prevent short-circuiting.

aving thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination with a spark plug, of ,I an intensifier on the outer or exposed end Aof the plug having a ring-form electrode and a central electrode with an annular sparkgap therebetween and a transparent hood inclosing said intensifier.

2. The combination with a spark-plug, of an auxiliary set of electrodes mounted in lan exposed position on said spark-plugr and producing a jump-spark at the exterior of an engine to which said plug is applied, and a removable hood that protects said electrodes and through which their operation ,may be observed.

3. The combination with a spark, plug and its ignition electrodes to be arranged within an engine, of a centrally disposed electrode on the exteriorly exposed end of said sparkplug, and a circle of electrode points arranged around said centrally disposed electrode.

4. -The combination with a spark-plugs extenior'and exposed end and the centrally disposed electrode wire having a nut thereon, of an insulated electric current conducting disk having an opening therein which provides aspark-gap around said nut, a transparent hood covering said nut and opening, and means exteriorly of said hood for' connecting an' electric circuit wire with said disk.

In testimony whereof I have hereunto signed ni name. f

v ICHARD E. HILDEBRAND,

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