Method of using magnetic lifting devices
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United States of America Patent
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May 6, 2003
Grant Date -
N/A
app pub date -
Aug 15, 2000
filing date -
Feb 4, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A method of testing whether a magnetic lifting device may safely lift a particular load where the magnetic lifting device is placed adjacent to the load, some or all of the magnetic elements of the magnetic lifting device are spaced such that the lifting ability of the magnetic lifting device is reduced by a predetermined amount. An attempt is then made to lift the load by a small safe distance. If this attempt is successful, the user can be sure use of the magnetic lifting device, when the lifting ability is restored, is safe. Conveniently, the spacing is achieved by the introduction of a substantially planar member between the magnetic lifting device and the load. The planar member has a similar footprint to that of the magnetic lifting device. The planar member may be made of stainless steel. A magnetic lifting device may incorporate magnetic elements which may be spaced such that the lifting ability of the magnetic lifting device is reduced by a predictable amount, for example it may incorporate a moveable planar member.
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