| 摘要 |
PCT No. PCT/CH95/00048 Sec. 371 Date Nov. 6, 1995 Sec. 102(e) Date Nov. 6, 1995 PCT Filed Mar. 2, 1995 PCT Pub. No. WO95/24139 PCT Pub. Date Sep. 14, 1995A strap closure for straps of wrist watches comprises a magnetic closure and an automatic mechanical lock. The closure comprises two closure parts (1, 2) and at least one permanent magnet (16) and a yoke (9), which form parts of a magnetic circuit. Said magnetic circuit is disposed inside a shield (6) made of a ferromagnetic material and closed as far as possible on all sides. Between the magnetic circuit (9, 15, 16) and said shield or other closure parts there is no metallic contact whatsoever with elements of high permeability, the magnetic circuit is instead isolated from the shield or from other closure parts by air gaps (22, 23) and fastening elements (14) of a low permeability close to the value of air. |
