Patent ID: 7190106
Filing Date: 2007-03-13
Classification: H01T

Abstract:
1. A spark plug for an internal combustion engine, comprising: a metal outer shell having a central bore; an insulator secured within said central bore of said shell; a center electrode mounted in said insulator; a ground electrode extending from said outer shell adjacent said central electrode and defining a spark gap therebetween said ground electrode having an upper surface and a lower surface and a through hole located at said spark gaps, said through hole extending between said upper and said lower surfaces; and a firing tip having a longitudinal axis, said firing tip being received at least in part in said through hole with said longitudinal axis extending towards said center electrode, and wherein said firing tip has a bulging portion substantially centered longitudinally in said through hole between said upper and said lower surfaces and extending radially outwardly from said longitudinal axis and mechanically retaining said firing tip within said through hole.