| 摘要 |
<p>A lifting device which can be used singly or in multiples to lift magnetically attractable material comprises a magnet having the operating surface covered by a non-magnetic contact member to form a fluid tight chamber therebetween, the operating surface being contiguous with the contact member when lifting an article and air under pressure being introduced into the chamber to move the magnet and contact member relatively apart to release the aricle therefrom.</p> |
