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7. 发明专利

JPS54113756A MAGNET TYPE LATCH 失效
公开(公告)号：JPS54113756A
公开(公告)日：1979-09-05
申请号：JP2053478
申请日：1978-02-24
申请人： HITACHI METALS LTD
发明人： TAKIMOTO SADAJI
IPC分类号： H01F7/02
摘要： PURPOSE:To increase adsorbing force, by fixing magnetic flux, which magnetically shapes a closed circuit when adsorption, to the movable portion side of a yoke passed through a flank of an outer circumferential portion of a magnet, in a magnet type latch used for a briefcase, other personal ornaments, etc. CONSTITUTION:A magnet 1 in rare earth metal cobalt is used as a magnet material, and a main body portion is formed in such a manner that the magnet is cylindrically worked and a yoke 3 is adherence fixed to the back while the front is covered with a non-magnetic cover 2. Meanwhile, the desired magnet type latch is produced by fixing a center yoke 4 for passing magnetic flux, which magnetically shapes a closed circuit when adsorption, through a flank of an outer circumferential surface of the magnet 1 to a front of an adsorbing plate 5 in a movable portion. Latches 6 are each fixed to the backs of said yoke 3 and the adsorbing plate 5. Such an arrangement can obtain sufficient adsorbing force, and can produce small-sized and thin latches.

10. 发明专利

JPS5491313A EQUIIPOLARITY OPPOSITE CONCENTRICAL GAP MAGNETIC CIRCUIT 失效
公开(公告)号：JPS5491313A
公开(公告)日：1979-07-19
申请号：JP15786077
申请日：1977-12-28
申请人： HITACHI METALS LTD
发明人： TAKIMOTO SADAJI , KAKINUMA NOBUO
IPC分类号： H04R9/02 , G01H1/00 , G01H11/02 , G01V1/16

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