US1560515A - Spark plug - Google Patents

Description

` L. HIRSCH SPARK PLUG Filed July 26, 1924 WITNESSES 1N VEA/TOR,

i l ATTORNEYS.

Patented Nov. 3, 1925.

UNITED .STATES LoUIs mason, or MESILLA rank, NEW i/Lnxroo.

sriinx PLUG.

Application led July 2, 1924. Serial 110.728,414. i

To all whom t may concern.'

Be it known that I,-LOU1s HIRsoH, a citi- Zen of the United States, and a resident of Mesilla Park, in the county of Dona Ana and State of New Mexico, have invented a new and Improved Spark Plug, of which the following is a full, clear, and exact description.

This invention relates to improvements in spark plugs, an object of the invention being to provide a plug having four electrodes providing a pair of spark gaps normally arranged in series and capable of connection with any desired electric circuit.

A further object is to provide a plug of the character stated in which one of the electrodes may be moved so as to open the normal circuit and provide a spark gap between the same and the plug casing through which latter the circuit is grounded.

A further object is to provide a plug of the character stated, in which the casing may remain fiXed to the engine cylinder and a removable shell fixed thereto and carrying the core and operative parts can be re moved and replaced at will.

With these and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings- Figure 1 is a perspective view illustrate ing my improved spark plug;

Figure 2 is a view in longitudinal section through the plug;

Figure 3 is a view in transverse section on the line 3-3 of Figure 2;

Figure 4 is an inner end view of the plug.

1 represents the casing of my improved plug which is externally screw-threaded at its inner end, as shown at 2, and adapted to be secured in an engine cylinder, and it is to be understood that this casing l may remain in the cylinder and the other portions of the plug removed and replaced at will. The upper end of the casing 1 is somewhat enlarged transversely and provided with internal screw threads 3 to receive the eX- ternally threaded lower end of a shell 4, the latter having a ground joint connection, as indicated at 5, with the casing 1 to render the connection gas tight. This shell 4 receives a screw-threaded nut 6 which functions to clamp the core 7 in the shell. The

core 7 has an annular enlargement 8 with a washer 9 interposed between the same and the inner end of the shell, and a washer 10 interposed between the enlargement 8 and the nut 6. The core 7 supports four electrodes 11, 12, 13 and 14, which extend through the core and are provided at their inner ends with terminals 15 positioned at right angles to the electrodes. It will be noted that these terminals are spaced apart forming a pair of spark gaps. The electrode 11 has rotary mounting or partial rotary mounting in core 7 and is connected by a conductor 16 with the distributor of the en- 70 gine. A crank arm 17 is fixed to the electrode 11 and may be connected by a rod 18 with any convenient operating device at the dashboard of the car. The turning movement of the electrode is limited by an arm 19 fixed thereto and engaging a stop or plug 20 on the core. The electrodes 12 and 13 are connected by a link or other form of electric conductor 21 and the normal circuit is as follows: from the distributor to from the wall of the casing 1 so as to form 90 a spark gap between said terminal and the casing. This movement of the electrode 11 opens the circuit as above described and provides a spark gap between the same and the casing 1, which circuit is grounded in the ordinary way.

Various slight changes and alterations might be made in the general form of the parts described without departing from my invention, and hence I do not limit myself to the precise details set forth but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of the appended claims.

I claim:

1. A sparkplug, comprising a casing, a core in the casing, four electrodes in the core providing two spark gaps at their inner ends, and all of said electrodes connected in series, one of said electrodes movablev to open the normal circuit and provide a spark gap between the same and the casing.

2. A spark plug, comprising a easing, a core in the easing, an electrode in the easing mounted t0 turn, a terminal on the inner end of the electrode at an angle thereto, :L

i? second electrode in the core having a terminal at its inner end, and said irst-Inen-v tioned elect-rode adapted to he turned to form a spark gap with the other electrode or With the casing.

3. A spark plug,`eomprising e easing, a,

shell removably secured therein, a core removably secured in the shell but removable from the casing with the shell, four electrodes located in the core and extending therethrough, said electrodes providing a pair of spark gaps at their inner ends, and

one of said electrodes movable to a position to form a spark gap with the casing and open the circuit through the other electrodes.

LOUIS HIRSCH.

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