Magnetic lifting apparatus

Abstract

A magnetic lifting apparatus by using neodymium magnets, incorporating a plurality of polarity plates (10) disposed with a predetermined interval and having non-magnetic medium (11) in the longitudinal center; a plurality of interval members (20) disposed between the polarity plates (10); a top cover (30) covering the interval members (20) and the polarity plates (10), having a hook (31) on the upper side; a plurality of neodymium magnets (40) having S/N polarity in opposite and disposed between the polarity plates (10); a plurality of rotors (50) rotated with the neodymium magnets (40) being inserted therein; a switch handle (60) for switching polarity position of the rotor (50) and the neodymium magnets (40) engaged therewith to switchably generate magnetic attraction. The oxidation prevention means (70) includes a hollow space around the neodymium magnets (40) either vacuum or filled with an oxidation prevention liquid in order to prevent the neodymium magnets (40) from being in contact with oxygen. The present invention prevents the neodymium magnets from being oxidized so as to improve magnetic performance and endurance. Further, the improved magnetic lifting apparatus of the invention minimizes body size and weight, guarantees simple operation, and improves performance and productivity.

Dependencies are inferred from the claim text.