Magnetic fastener
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United States of America Patent
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-
Oct 25, 1988
Grant Date -
N/A
app pub date -
Jul 1, 1987
filing date -
Jul 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic fastener which substantially excludes external leakage of magnetic flux therefrom. The magnetic fastener has a fixed element and a movable element. The fixed element includes a permanent magnet plate, upper and lower iron plates located on upper and lower faces of the permanent magnet plate, and an iron bar erected uprightly on the lower iron plate. The upper iron plate has an upper face flush with an upper end face of the iron bar to form a magnetic attracting face. The fixed element further includes a magnetic shield plate located above the upper iron plate around the magnetic attracting face with a magnetic gap interposed therebetween. The magnetic shield plate has a cylindrical portion which covers outer peripheries of the upper iron plate and the permanent magnet plate and contacts with an outer peripheral edge of the lower iron plate.
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