| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely prevent leakage of current even in an ignition plug in which at least a part of a rear end side barrel part is exposed to the outside, by suppressing attachment of water droplets or the like to the rear end side barrel part. <P>SOLUTION: A rubber member 3 is attached to an ignition plug 71 in which a rear end side barrel part 72A is exposed to the outside when the ignition plug 71 is attached to a combustion apparatus EN. The rubber member 3 has at one end part thereof an insertion target part 3A configured to insert therein at least a part of a tool engagement part 84 of the ignition plug 71 when the insertion target part 3A is attached to the ignition plug 71. At least a partial inner diameter of a portion of the insertion target part 3A in which the tool engagement part 84 is disposed in the inner periphery of the insertion target part 3A is smaller than a diameter of a virtual circle V1 which is formed, in a cross section orthogonal to an axis CL1, around the axis CL1, and passes through a portion of the tool engagement part 84 which is located outermost in a radial direction. <P>COPYRIGHT: (C)2013,JPO&INPIT |
