| 摘要 |
PURPOSE:To always keep the title contact mechanism in an off mode, when a movable contact which has been welded to a fixed contact returns, by making at least either contact get out through the fitting hole of a contact piece as well as making the periphery of the fitting hole through which the contact has got out covered with an elastic insulating plate. CONSTITUTION:When a movable contact 42 has been welded to a fixed contact 44 and the movable contact 42 is getting out from the fixed contact 44 owing to the spring force of a movable contact 41, the fixed contact 44 gets out through a fitting hole 45 and moves while being welded the movable contact 42. After that, the clippers 47, 48 return inward by self spring force to plug the fitting hole 45 and cover the periphery of fitting hole 45. Therefore, even when an electric magnet part 2 is again excited and the movable contact 41 is pressed by a card 32 through a movable iron piece 31, the fixed contact 44 welded with the movable contact 42 cannot come in contact with the movable contact 41 owing to an elastic insulator 46. Thereby, the contact mechanism cannot operate always in an off mode, so the malfunction of a heater, motor, etc., being connected as a load can be prevented. |
