Patent ID: 6328619
Filing Date: 2001-12-11
Classification: H01T

Abstract:
An equipment for producing a spark plug comprising an insulator in which a through-hole is formed in an axial direction of said insulator, a metallic element fixed at one end of said through-hole, a center electrode fixed at the other end of said through-hole and a sintered conductive material member comprising a mixture of glass and a conductive material being formed with the through-hole between the metallic terminal and the center electrode for connecting said metallic terminal and the center electrode electrically, said equipment comprising:a heating device for non-uniformly heating a spark plug assembly comprising said insulator in which said through-hole is formed in an axial direction of said insulator, said metallic terminal fixed at one end of said through-hole, said center electrode fixed at the other end of said through-hole and packing layers of a bulk powder of the sintered conductive material member being formed in the through-hole between the metallic terminal and the center electrode so that said packing layers of the bulk powder begin to soften from the center electrode side along the longitudinal axis of the insulator.