| 摘要 |
PURPOSE:To reduce statical friction force and dynamical friction force and attemuate sliding force, by balancing the attracting force of a magnet roughly with a load. CONSTITUTION:By attracting a rail 1 with a magnet 2, a retainer 4 is attracted via a bolt 9, and a sliding piece 5 jointed to the retainer comes in contact with the rail 1 and slides. A load 3 works opposite to the attracting force of the magnet to separate the sliding piece from the rail via the retainer, but the attracting force of the magnet is designed to be almost equal to the load, and so slidable friction force is extremely reduced. When the load becomes greater than the attracting force of the magnet, then the sliding piece 5 is separated from the rail, and an auxiliary sliding piece 6 comes in contact with the rail 1 to slide. Also in this case, the attaching force which is not almost changed is retained, ans so that slidable friction force between the auxiliary sliding piece 6 and the rail 1 is also retained to a little degree.
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