Abstract A fastener means for releasably fastening first and second elements, for example a handbag and flap for closure has first and second members which in use are attached to the first and second elements respectively. The first member includes a permanent magnet (1) having a hole (4) therethrough between the opposite end surfaces (1a,1b). Respective poles of the magnet are located adjacent the respective opposite end surfaces (1a,1b), one such end surface (1b) being oriented so as to extend in a direction away from the first element when the first member is attached thereto. At least part of the surface of the magnet are covered by a covering (5). The second member comprises a ferromagnetic member (2) attracted in use to the pole adjacent this one end surface (1a). The covering (5) is formed of a ferromagnetic material having a thickness of between 0.03 mm and 0.20 mm. <IMAGE>
A fastener means comprising a permanent magnet having a through-hole extending between the magnetic poles, a ferromagnetic member attached to one of the magnetic pole surfaces, and a ferromagnetic member attached to the other magnetic pole surface, which is characterized in that said ferromagnetic members are detachably attracted to each other via said through-hole, and that the surfaces of the permanent magnet to which said ferromagnetic members are not attached, excluding the inner peripheral surface of the through-hole or including the inner peripheral surface of the through-hole at the mouth, are covered with a ferromagnetic material having the thickness of from 0.03 mm to 0.20 mm to minimize the flux leakage without substantially decreasing usable attraction force of the fastener means.
Claim 2
Dependent Claim
121 words
A fastener means comprising a permanent magnet having a through-hole extending between the magnetic poles, a ferromagnetic member attached to one of the magnetic pole surfaces, and a ferromagnetic member attached to the other magnetic pole surface, which is characterized in that said ferromagnetic members are detachably attracted to each other via said through-hole, and that the surfaces of the permanent magnet to which said ferromagnetic members are not attached, excluding the inner peripheral surface of the through-hole or including the inner peripheral surface of the through-hole at the mouth, are covered with a ferromagnetic material having the thickness of from 0.03 mm to 0.20 mm to minimize the flux leakage without substantially decreasing usable attraction force of the fastener means.
Claim 3
Dependent Claim
23 words
The fastener means as claimed in claim 1, wherein said ferromagnetic material covering the surfaces of the permanent magnet is a ferromagnetic casing.
Claim 4
Dependent Claim
23 words
The fastener means as claimed in claim 1, wherein the ferromagnetic material covering the surfaces of the permanent magnet is a ferromagnetic plating.