US1343052A - Heath - Google Patents

Description

A. E. HEATH.

SPARKING PLUG FOR IGNITION PURPOSES.

APPLICATION FILED SEPT. 29, 1919.

Patented June 8, 1920.

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UNITED STATES ARTHUR, ERNES'TEEAH, OF LONDON, ENGLAND.

SPAR/KING PLUG 1F03-.t IGNITION PURPOSES,

Spccilcation of Letters Patent.

Patented June 8, 1920.

Application filed. September 29, 1919. Serial No. 327,015.

To all wlw/nt if; may concern.'

De it known that l, An'rirun Enivns'r llnafrrr., a subject oi the King of Great Britain, residing at London, England7 have invented certain new and useiul Improve ments in Sparking Plugs for Ignition Pun poses7 of which the following is a specilication.

The object of this invention is to give further protection to the insulator together' with the central electrode, from the hot gases and oil vapor, than is possible with known sparking plugs having bailles oi various terms, and to prevent as far as possible the insulator being overheated and breaking down electrically, the carbonizing of its surface and preignition.

For the purpose et my invention l position a sleeve ot metal or other' suitable material in combination with a holed baille such sleeve being positioned between the insulator carrying the central electrode and the inner wall of the sparking plug body at that part exposed to the hot gases such sleeve being held in position by any desired means such as by forming the sleeve with a ilange and gripping the flange on a shoulder formed on the plug body by the nut retaining the insulator. On each side ot the sleeve is a space and below the sleeve is positioned the balile through which l drill a ring of holes, such holes being so positioned that the bulk of the hot gases and oil vapor are directed into the space between the sleeve and the plug body and the sleeve may be contracted at the lower part to assist in directing the gases and oil vapor into the space between the sleeve and the plug body, a small portion of gases and oil vapors also passing through the hole in the center of the baille mixing with the cooler gases that have passed through the ring of holes in the battle and toward and into the space between the sleeve and the insulator.

The tubular sleeve may be held in the plug` body in several ways and be made in several forms, for instanceV it may be held at its top by a flange or collar and around its circumference and near its lower end by a flange or collar having slots for the passage ot gas and oil vapor into the outer space. A

My invention will be clearly understood from the 'following description aided by the example shown on the annexed drawings.

Figure' l a part sectional elevation of a sparking plug embodying my invention.

Fig, Q is an under plan of Fig. l.

Fig. 3 is a plan of the sleeve.

Fig. 4 is an elevation of the sleeve.

Fig. 5 is an under plan of the sleeve.

I provide the plug body A with a shoulder B and with a battle C having holes D. lVithin the plug body A, l position a sleeve E such sleeve having a llange F engaging the shoulder B and its body portion some what conical or to conform somewhat to the shape of the insulator Gr at the part which it surrounds, the sleeve further hav ing a collar or flange H on its outer surface and near its lower end such collar being provided with slots or openings I to allow free access ot the gases and oil vapors to the space between the sleeve and the wall of the plug A the collar or flange making inetallic contact with the plug body A so as to assist in holding the sleeve E in place and conveying the heat of the gases imparted to the sleeve as much as possible to the plug body. The sleeve E is contracted at the lower part as at J to assist in conducting the gases entering by the holes D into the space between the sleeve E and the plug body A the holes D being also positioned for that purpose.

The end of the central electrode K is situate within the central hole of the baille as is usual and the sleeve E is so constructed that there is a space on each side of it, that is to say, there is a space between the sleeve and the wall of the plug as also a space between the sleeve and that part of the insulator exposed to the hot gases.

By this construction the main portion of the hot gases will pass through the holes D into the space between the sleeve and the plug body and thus the bulk ot the heat will be imparted to the sleeve and plug body and not direct to the insulator Gr, there only being a small proportion of the hot gases passing through the hole surrounding the electrode these gases mixing with the gases that have been cooled by passing through the holes in the baille and as a great proportion ot the heat ot these will be imparted to the holed baffle C and the sleeve E the sleeve E having Contact with the plug body by its Hanges and collar F and H the heat Will be conveyed' to the plug body and thereby the insulator Gr and eleetrodeK'are'kept as cool as possible.

The sleeve E is further held in position by the shoulder portion L of the insulator pressing upon its liange F Whenthe gland nut M is screwed home or the lange F may be dispensed with, a Washer N being interposed bet'ween the shouldered portion L and the flange F or edge ofthe sleeve E and the shoulder O, thus making a gas tight oint.

lhat I' do claim vras Iny inventionund desire' to secure byLetters Patent s tl. In sparking plugs for :ignition purposes having a bailleprovided with ring of holes, Laitubular sleeveL positioned and held Within the plug bodyandsurrounding the insulator carrying the central electrode at that'part 'exposed to the'hot-gases, a space being provided on eaoh'side of thesleeve, substantially las 'and lfor the purposes set forth.

2. In sparking plugs for ignition purposes having a baille provided with a ring or' holes, and a tubular sleeve as set forth in claim l positioning the holes in the baille so as to direct the hot gases passing through same into the space between the sleeve and the plug body.

3. In a sparking plug for ignition purposes having a ballie provided with a ring oi' holes, a tubular sleeve within the plug body and surrounding the insulator ol the Central electrode at the part exposed to the hotgases and having spaces on each side, such sleeve being provided with flanges lor engagement and Contact with theplug body for Conducting the heat imparted to it by the hot gases away from the insulator and to the plug bo'dy, substantially as deserihcal.

Intestimony whereot'l havehereunto set iny hand in presence of two subscribing wit ARTHUR ERNEST HEATH.

Witnesses `WM. O. BROWN, FRED. HU'roHnNs.

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