| 摘要 |
PURPOSE:To minimize number of attachment parts and save labor for assembly as well as to exclude bulking to the upmost by the method wherein a pole has a thick part and a thin part, the thin part inserted and engaged through a hole of a metallic plate is forced into and engaged through a proper attachment base in a caulking pipe inserted from the opposite plane of said base and having a large head. CONSTITUTION:A ferromagnetic pole 4 is standed on a metallic plate 2 in a hole 1a in the manner that a thin part 4b of the pole 4 is inserted in the hole 2a of the metallic plate 2. The thin part 4b is forced into and engaged in a caulking pipe 7 inserted through a base 6. Another fastening member inserts a thin part 5b of a ferromagnetic pole 5 into a hole 3a of a ferromagnetic plate 3 and force into and engage to the attachment base 6 with using the caulking pipe 7. Between the fastening member having a hole and one having a projection thus constituted, the metallic plate 3 is brought to be in contact and attracted to the pole face of the magnet 1 through a case 8 and the thick parts 4a and 5a of the poles 4 and 5 come in contact and attract each other and constitute a closed circuit of the magnetic flux. |
