US1333400A - Spark-plugs - Google Patents

Description

F. o. HSK. I METHOD 0F MANUFACTURINIGISPARK PLUGS.

vAPPLICATION FILED-JUNE 20. 1919;

1,333,400. Pawntd' Mr. 9, 1920.

i when in the molten state.

FREDERICK c. rrsK, or WILLIAMsvrLEnmEWYour: s

MTI-IOD 0F MANUFACTURING SPARK-PLUGS.

Specification of Letters Patenti Patented Mar.y 9, 1920.

Application led .Tune 20, 1919. Serial No. 305,681.

lo all 'Lc/1.0m it may conce/rn.'

Be it known that I, FREDERICK C. FISK, a citizen of the United-States of America, residing in the town of 1Williamsville, county of Erie, and State of New York, have invented certain `new and useful Improvements in Methods of Manufacturing Spark- Plugs, of which the following is a full, clear,

and exact description.

My invention relates generally to a method of manufacturing spark plugs, and more particularly to that type of spark plug in which an auxiliary spark gap is provided.

In making spark plugs of this type, glass is usually used as the insulating material because of its transparency and fluidity The auxiliary spark gap is usually formed at some distance from the exposed ends of the electrodes of the spark plug and difficulty is experienced-in properly supportingthe electrodes, 'so that they will remain in the proper alinement when the glass is poured within the matrix and around them. It is also difficult to prevent the molten glass from flowing in between'the auxiliary spark gap in the ordinary method of manufacturing such plugs.

The general object of my invention has been to-provide a method in which the insulators for suc-h plugs may quickly made, and in which the inner ends of the electrodes, in the auxiliary spark gap, shall be positivelv held in alinement and in predetermined relation with each other.

In the accompanying drawings, forming part of this application, I have shown one part of an apparatus for carrying out my method; and, it is clear, that any other suitable molding apparatus may be used.y

In the drawings:

Figure 1 represents the face view of one part of the molding flask showing the electrodes in position.

Fig. 2 shown a fragmentary portion of the same part, with the insulator molded and in section.

In the drawings 5 represents one portion' of the customary t\vo'part molding flask, which is, of course, provided with the pouring opening, not shown. 6 is the matrix of the'flask which is of a shape to provide any desired form of insulator, the form shown being 'one in which a taper is provided at be easily and each end of the insulator with an annular flange near the middle portion thereof.

7 and 8 are annular supporting disks which are centrally arranged within recesses 9 and 10, respectively. These recesses are formed within the parts of the flask, and preferablyk a slight distance from the ends of the matrix 6, with walls 11 therebetween. Each of the disks is provided with ay central aperture 12 and a set screw 13, whereby the exposed ends of the electrodes 14 and 15 may be suitably clasped and held. The inner ends of each of the electrodes is preferably provided with a peripherally reduced portion 16, whereby a vshoulder 17 isformed on each. 18 is a perforated, hollow,` Aglass sphere or a perforated bead, in the op ositely arranged openings of which are posed the portions 16 of the electrodes. The shoulders 17 are so positioned as toprovide a predetermined spark gap between the ends of the electrodes when the shoulders are pressed in contact with the outer surface of the head. The electrodes are, ofcourse, held in this predetermined position by the disks 7 and 8. l

When my process is carried out by the apparatus herein shown and described, the parts of the fiask and the. electrodes are, of course, first heated. The portion 16 of the electrodes are'placed in position within the bead 18 and the outer ends of the electrodes are then placed in position and firmly secured within the disks 7 and 8. The disks are then placed within the recesses 9 and 10 and the fiask closed. The molten glass is now poured within the matrix and surrounds the The temperature of the molten glass will be sufficient to fuse with the glass bead 18 and make the same an integral part of the insulator. After the flask has become suffilcientlyy cooled it may be opened and the in- `sulator easily and quickly removed therefrom.

Having thus i described my invention what I claim is: i

1 'A method of manufacturing spark plugs which consists in placing the inner ends of the electrodes in the perforations of a transparent sphere and leaving between the ends a space for' the spark gap, then placing the electrodes and the sphere within thematri'x of the .flasK, and then pouring molten insulating material Within the matrix and around the electrodes and sphere.

2. A method of manufacturing spark 5 plugs, which consists lin placing the inner ends of the electrodes inthe perforations of t'. transparent sphere and leaving between the ends a-space for the spark gap,'then rig# idly supporting the opposite ends of the electrodes within the matrix, and then p0r- 10 ing molten insulating. material -Within the FREDERICK o. Fien;

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