초록

A magnetic fastener wherein magnetic flux from a permanent magnet flows to and from a permeable planar armature through air gaps of substantially equal areas which are small compared with the area of either face of the magnet.

대표청구항 ▼

A magnetic fastener including in combination an armature formed of a magnetically permeable material having a generally planar surface, a cylindrical permanent magnet having respective north and south pole faces each extending parallel to said surface, one pole face being disposed adjacent said surf

A magnetic fastener including in combination an armature formed of a magnetically permeable material having a generally planar surface, a cylindrical permanent magnet having respective north and south pole faces each extending parallel to said surface, one pole face being disposed adjacent said surface and the other pole face being disposed remote from said surface, magnetically permeable means for coupling flux from said remote pole face to a point in close proximity to said surface, magnetic flux flowing between said coupling means and said surface through a first air gap of predetermined cross-sectional area which is much smaller than the area of a pole face, and a layer of magnetically permeable material having an area substantially equal to that of an covering said adjacent pole face, said armature and said layer being so constructed that flux flows between said layer and said surface through a second air gap having approximately said predetermined cross-sectional area.