Buckles – buttons – clasps – etc. – Having magnetic fastener
Patent
1992-09-01
1994-01-04
Sakran, Victor N.
Buckles, buttons, clasps, etc.
Having magnetic fastener
2922515, 335285, A44B 2100, H01F 700
Patent
active
052748898
ABSTRACT:
The present invention relates to a fastener means which utilizes the attraction force of a permanent magnet and which is characterized in that a ferromagnetic member attached to one of the magnetic pole surfaces of an annular permanent magnet constituting the fastener means and having a through-hole extending between the magnetic poles and a ferromagnetic member attached to the other magnetic pole are detachably attracted to each other via said through-hole, and portions of the surfaces of the permanent magnet to which the first ferromagnetic member is not contacting the permanent magnet, excluding the peripheral surface of the through-hole or including the peripheral surface at the mouth of the through-hole, are covered with a ferromagnetic casing or a ferromagnetic material, such as a ferromagnetically plated sheet, having the thickness of about 0.03 to 0.20 mm.
REFERENCES:
patent: 4453294 (1984-06-01), Morita
patent: 4455719 (1984-06-01), Morita
patent: 4480361 (1984-11-01), Morita
patent: 4700436 (1987-10-01), Morita
patent: 4779314 (1988-10-01), Aoki
patent: 4991270 (1991-02-01), Aoki
patent: 5042116 (1991-08-01), Ossiani
Sakran Victor N.
Tarmo Co. Ltd.
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