US2121178A

US2121178A - Spark plug

Info

Publication number: US2121178A
Application number: US102110A
Authority: US
Inventors: Sousa Manuel
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-09-23
Filing date: 1936-09-23
Publication date: 1938-06-21
Anticipated expiration: 1955-06-21

Description

June 21 1938. M s s SPARK PLUG Filed Sept. 25, 1936 a a R m i H m s n T 1 u m W m m k s. 7...| 3...;1. AMM\ I a 7 M v /H\ l u u Patented June 21, 1938 PATENT OFFlCE 'SPARK PLUG Manuel Sousa, West Hartford, Conn. Application September 23, 1936, seam No. 102,110

3 Claims.

' among others, is the production of a spark plug which is simple in construction and particularly efllcient in operation.

One form of a spark plug, embodying my invention and in the construction and use of which the objects herein set out, as well as others, may be attained is illustrated in the accompanying drawing in which Figure 1 is a view in side elevation of my improved spark plug which is partially broken away in central lengthwise section.

Figure 2 is a similar view looking in a direction at right angles from the point of view of Fig. 1, the section being slightly oil from the center.

Figure 3 is a view in central lengthwise section through a modified form of my improved plug.

Figure 4 is an end view of my improved plug.

Figure 5 is a view similar to Fig. 1 but showing another modification.

Figure 6 is a view in side elevation of the plug shown in Fig. 5 with the parts disconnected.

Figure 7 is a view in central lengthwise section of last mentioned plug but looking in a direction at right angles to the point of view of Fig. 5.

Figure 8 is a side view showing a little different form of my improved plug.

In the accompanying drawing the numeral 8 denotes the body of my improved spark plug that may be composed of any suitable material having a threaded portion 9 as a means for attachment to an engine, said body also having an angularly shaped portion III for the reception of a wrench by means of which the body may be aflixed to or removed from an engine. The body has a central opening ll extending through it for the reception of a core l2 composed of porcelain or other similar material, the parts thus far described being of old and well-known construction.

The core has a central opening through which a conductor l3, preferably of nichrome, extends, the outer end of said conductor being threaded to receive a terminal l4 composed of any suitable electrical conducting material. This terminal is embedded in a cap l5 of insulating material, such as bakelite, or other suitable composition, the terminal being preferably molded into place in the cap. Said terminal has a socket l6 for the reception of a conducting wire ll suitably insulated and provided with a metallic cap l8 formed to fit the socket [6, said cap having a rib l9 to frictionally engage an annular groove in the wall 01' the socket l6, and as shown in Fig. 1 of the drawing. An electrode 20 of star shape is secured to the end of the tip 30, the fingers 2| of said electrode extending into proximity to a ring-like electrode 22, preferably composed of nichrome, secured to the end of the body '8, and as shown 5 in Figs. 3 and 4 of the drawing, the electrode 20 also being preferably composed of nichrome.

A tip 30 of suitable heat resisting material is secured to the end of the conductor I3, and as shown in dotted lines in Fig. 3 of the drawing, 10 as a preferred means this tip having a threaded socket to receive the threaded end of the conductor; The core l2 may if desired be provided with a jacket 3| composed of asbestos or other suitable heat resisting material and as shown in 16 Figs. 3 and 7 of the drawing. A nut 32 also of nichrome may be employed for attaching the conductor l3 to the core |2.

The operation of the plug will be readily understood by those skilled in the art, it being 20 briefly stated that the electric current passes by wire ll, terminal l4, conductor l3, electrode 20, and across the gap between the ends of the fingers 2| and electrode 22, thereby creating a spark. From this point the current passes through the body of the plug which is grounded upon the engine in a manner common to structures of this kind.

That form of the device shown in Fig. 3 is similar to that shown in Figs. 1 and 2 except that the 80 terminal 23 extends lengthwise of the cap 24, opening toward the end of' said cap. This 10-- cates the socket 25 for the reception of the wire I! at the end of the cap instead of at the side, as shown in Fig. 1.

The caps l5 and 24 may be screw threadedly engaged with the body 8, as shown in Fig. 8, or

they may be held in place asby means of a ball 26 as shown in Figs. 5 to 7, the bail being pivotally attached to the body 8 and being adapted to be sprunginto a notch 21 in the top of the cap. The structure shown in Figs. 5 to 7 is similar to that shown in Figs. 1, 2 and 3 with the exception that the electrodes 28-29 are of a type common to spark plug construction.

In accordance with the provisions of the patent statutes I have described the principles of operation of my invention, together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that the device shown is only illustrative and that the invention may be carried out by other means and applied to uses other than those above set out.

I claim:

i. A spark plug including a body, a core extending within said body, a conductor extending within said core, a cap of insulating material and having a skirt with its lower edge attached to said body and having a recess, a terminal permanently enclosed in said recess in said cap, means for securing said terminal to said conductor, a socket in said terminal to receive a conducting wire encased in a sheath, a cap on the end of said sheath to frictionally engage said socket, and cooperating electrodes at the ends of said conductor and body. body.

2. A spark plug including a body, a core extending within said body, a conductor extending within said core and having a threaded end, a

tip of heat resisting material secured by means of a threaded socket therein engaged with said threaded end of said conductor, a cap of insulating material attached to said body having a skirt with its lower edge attached to said body and having a recess, a terminal permanently enclosed in said recess, means for attachment of a conducting wire to said cap, and cooperating elec trodes at the ends of said tip and said body.

3. A spark plug including a body, a core extending within said body, a conductor extending within said core, a cap of insulating material having a skirt with its lower edge fitted to the end of said body, a bail pivotally mounted for removably securing said cap in place by engagement therewith, a terminal permanently enclosed in a recess in said cap and secured to said conductor, a socket in said terminal to receive a conducting wire, and cooperating electrodes at the ends of said conductor and body.

MANUEL SCUBA.