Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1990-05-15
1991-02-12
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335302, H01F 702
Patent
active
049927680
ABSTRACT:
A cow magnet to be ingested by a ruminant animal comprises a stack of cylindrical permanent magnets having intermediate disk-like spacers of a soft magnetic material where the stack is held together by first and second plastic end cap members with integrally formed tubular sleeves adapted to fit into central bores formed through the cylindrical magnets and spacers with a predetermined friction fit. A pin formed from high carbon steel is then inserted down the center of the tubular sleeves to cause them to expand and tightly engage the side walls defining the central bore formed through the stacked arrangement of magnets and spacers.
REFERENCES:
patent: 4283698 (1981-08-01), Fujisawa
patent: 4749978 (1988-06-01), Imamura et al.
Edmundson, Jr. William E.
Mozis Byron G.
Harris George
Power Magnets, U.S.A.
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