Patent ID: 7768183
Filing Date: 2010-08-03
Classification: H01T

Abstract:
1. A spark plug comprising: an electrode extension having both an upper portion for being selectively connected to an energy source and a lower portion; a firing electrode substantially axially aligned and in communication with the lower portion of the electrode extension; a ground plate situated proximate to the firing electrode so as to define a spark gap between the firing electrode and the ground plate; a sleeve insulator surrounding the electrode extension and having a first end and a second end and a central section; an upper insulator surrounding both the upper portion of the electrode extension and the first end of the sleeve insulator so as to be in contact with the sleeve insulator; a lower insulator surrounding both the lower portion of the electrode extension and the second end of the sleeve insulator so as to substantially be in contact with the sleeve insulator; a metallic conduit surrounding the upper and lower insulators and the sleeve insulator; and wherein the upper and lower insulators are spaced axially from one another across the central section of the sleeve insulator such that the central section is exposed directly to the surrounding metal conduit.