| 摘要 |
PURPOSE:To completely prevent the inclination in one direction by the edge of a hole by a method wherein the diameter of the hole of a ferromagnetic plate is made long in one direction, and the diameter of the hole in the direction orthogonally intersecting with the above-mentioned direction is formed approximate to the diameter of a ferromagnetic protrusion. CONSTITUTION:A ferromagnetic plate 3 has the disc shape having the same diameter as the surface (b) of a magnetic pole, a male part fitting B is constituted by integrally attaching a ferromagnetic protrusion 3a and a leg member 6 to the ferromagnetic plate 3, the ferromagnetic plate 3 is attracted to the magnetic pole face (b) of a female part fitting A and, at the same time, the ferromagnetic protrusion 3a is attracted to a ferromagnetic protrusion 2a in a hole 1a. The hole 4a of a ferromagnetic plate 4 has the distance between the opposing hole edges in one direction, the diameter (d) in other words, is made long, the distance between the opposing hole edges in the direction orthogonally intersecting with the above-mentioned direction is formed into a deformed hole of the diameter d' which is approximate to the diameter of the ferromagnetic protrusion 3a. When the female part fitting A and the male part fitting B which is attracted to the female part fitting A are tried to incline to the direction of the diameter d' having the short distance between the hole edges, they are not inclined because the gap between the ferromagnetic protrusion 3a and the hole 4a is small, the attraction between them does not come off, but said attraction can be removed easily when they are inclined to the diameter (d) having the longer distance between the hole edges. As a result, magnetic flux is concentrated on the hole edge on the narrow side of the hole 4a, and as there is no gap and the magnetic flux can be passed easily, attracting force can be generated effectively.
|
