Patent ID: 8505874
Filing Date: 2013-08-13
Classification: H01F

Abstract:
1. An adjusting screw structure of an oil immersed solenoid comprising: a movable core provided in a space of a case so as to be movable in an axial direction, the movable core being biased by an adjusting spring in a direction in which the movable core is pulled by a fixed magnetic pole portion or in an opposite direction thereof; and an adjusting screw structure capable of adjusting biasing force of the adjusting spring, the adjusting screw structure comprising an air-bleeding plug configured to be detachably attached to and seal an opening end portion of the case, the opening end portion communicating with the space of the case; wherein the air-bleeding plug includes an internal screw portion with which the adjusting screw structure threadedly engages, and a detachable mechanism configured to attach the air-bleeding plug to the opening end portion of the case such that the air-bleeding plug is located at a predetermined attachment position in a movement direction of the adjusting screw structure, and wherein the detachable mechanism includes: