| 摘要 |
PURPOSE:To prevent the lateral displacement of magnetically attracted surface and enhance a magnetic attracting force utilizing a magnet itself to be used by removably abutting a ferromagnetic bar protruded from the one or both ferromagnetic plates against the other ferromagnetic bar or ferromagnetic plate through a hole of a permanent magnet. CONSTITUTION:A case 1 and a case 1' are formed symmetrically during use in the same size and the same diameter. The dimension of rising part exposed at the outside of the case 1' of a permanent magnetic 5 to be engaged with the case 1' is set equally to the dimension of the part which is extended up to the upper edge of the rising part of the case 1 from the surface of the engaging ferromagnetic plate 3 of the other case 1. The exposed edge surface of magnet 5 is formed directly as the engaging edge collar for the edge of rising part of case 1. A protruded ferromagnetic bar 6 is formed to the ferromagnetic plate 3 engaged in the case 1, 1' in such a dimension as reaching the other ferromagnetic plate 4 through a hole 5a of the permanent magnet 5a. Thereby, a closed magnetic circuit of the permanent magnet 5 is formed between the plate 3 in the one case 1 and the plate 4 in the other case 1'. |
