Federal-mogul World Wide, Inc.

Federal-mogul Ignition Company

Richard E Callahan

Mark McMurray

Kevin Miller

Robert D Freeman

Michael S Joseph

Ellen M Hively

Kevin L Miller

An extension-type spark plug includes an upper terminal stud and a lower terminal stud axially spaced from one another in electrical communication with one another. An upper tubular insulator having a through cavity surrounds at least a portion of the upper terminal stud. A lower insulator constructed of a separate piece of material from the upper insulator has a through cavity surrounding at least a portion of the lower terminal stud. A spring member is disposed between the upper terminal stud and the lower terminal stud and biases the upper terminal stud and the lower member away from one another. The spring member allows the upper terminal stud to move axially under an externally applied force sufficient to overcome the bias imparted by the spring member and maintains electrical communication between said upper terminal stud and said lower terminal stud.

Extension-type spark plug

A spark plug assembly () for engine applications where the combustion chamber is difficult to access when servicing or replacing a spark plug. The spark plug assembly () includes a fairly traditional spark plug component () to which an elongated tubular conduit () is attached, such as by welding, to a portion of the metallic shell (). The conduit () contains an upper ceramic insulator () adjacent its top end () disposed in end-to-end abutting contact with an outer elastomeric insulator (). The ceramic insulator of the spark plug component (), herein referred to as a lower ceramic insulator (), is surrounded by the outer elastomeric insulator () and held securely within the conduit () thereby. An inner elastomeric insulator () is disposed in a continuous passageway formed between aligned central bores formed in the respective upper ceramic () and outer elastomeric () insulators. The inner elastomeric insulator () supports and further electrically isolates an elongated electrically conductive center electrode extension () that is in direct electrical conductivity with the center electrode () of the spark plug component (). An ignition lead wire makes electrical contact with the center electrode extension () and thereby delivers electrical energy at timed intervals to the spark gap.

14 mm extension spark plug

A spark plug for igniting gases in an internal combustion engine is disclosed. The spark plug has a center electrode, an insulator, a one-piece shell, and a terminal. The center electrode is in communication with an energy source. The insulator surrounds the center electrode. The one-piece shell surrounds and contacts the insulator for securing the insulator within the shell, wherein the shell has a plurality of threads near a first end and a ground electrode attached to the shell and aligned with a tip of the center electrode at a second end to define a spark gap. Further, a seat is formed in the shell between the plurality of threads and the ground electrode for sealing the shell against the engine. The terminal has a first end in communication with the center electrode and a second end which has a connector portion for connecting to the energy source.

One piece shell high thread spark plug

An extension-type spark plug () is disclosed for igniting the air-fuel mixture in an internal combustion engine. The spark plug () includes an installation conduit (), a contact button (), an electrode extension (), a firing electrode (), a ground plate (), a sleeve insulator (), an upper insulator () and a lower insulator (). The electrode extension () is axially aligned with and in communication with the firing electrode (). The ground plate () is proximate the firing electrode () to define a spark gap between the firing electrode () and a first end of the ground plate (). The sleeve insulator () surrounds the electrode extension (). The upper insulator () surrounds an upper portion of the electrode extension () and is in contact with the sleeve insulator (). The lower insulator () surrounds the lower portion of the electrode extension () and is in contact with the sleeve insulator ().

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Maumee, OH, United States of America

Richard E Callahan