| 摘要 |
Equipped are a conductive first plunger (21) including, on a same axis, a distal end portion (21a) having a tapered distal end shape, a flange portion (21c) extending from a base end side of the distal end portion (21a) and having a diameter larger than a diameter of the distal end portion (21a), a boss portion (21d) having a diameter smaller than a diameter of the flange portion (21c), and a base end portion (21e) having a diameter smaller than a diameter of the boss portion (21d), a conductive second plunger (22) including, on the same axis, a second distal end portion having a tapered distal end shape and a boss portion (22c) having a diameter substantially equal to a diameter of the base end portion (21e), and a coil spring (23) including a coarsely wound portion (23a) formed by winding at a predetermined pitch with an inner diameter equal to or larger than the diameter of the boss portion (21d) and a tightly wound portion (23b) formed by tightly winding with an inner diameter substantially equal to the diameter of the boss portion (22c), so that the first plunger (21) and the second plunger (22) are connected to each other on the same axis. |
