| 摘要 |
PROBLEM TO BE SOLVED: To simplify assembly without damaging the function of a spherical joint by forming a recessed part for bringing an iron piece for constituting the spherical joint into contact at the end edge part of two iron plates and inserting a permanent magnet piece between the iron plates. SOLUTION: The recessed part 14 in a circular arcuate shape is formed at a position for constituting the spherical joint at the end edge part of the two iron plates 11 and 12, and the inner side of the recessed part 14 is formed into a concave surface corresponding to the spherical surface part of the iron piece 2 so as to tightly adhere the iron piece 2 for constituting the spherical joint. A magnetic pole is formed by the magnetic force of the permanent magnet piece 13 between such two iron plates 11 and 12, the contact part 21 of the iron piece 2 is brought into contact with the recessed part 14 at the end edge part of the respective iron plates 11 and 12, and the contact part 21 is tightly adhered to the recessed part 14 by the action of magnetic attraction force. Thus, the assembly is simplified without damaging the function of the spherical joint. |
