Patent ID: 6460466
Filing Date: 2002-10-08
Classification: B65G

Abstract:
A drive device, comprising a tubular housing (2) including a longitudinally moving movable unit (4) mounted thereon, the movable unit having an inner part (5) located in an interior of the housing (2) and an outer part (6) which is arranged externally on the housing (2) and is magnetically coupled for movement with the inner part by means of a coupling means (12) having at least one permanent magnetic means (16 and 22), the coupling means (12) producing at least one magnetic circuit (13) completely passing through the inner part (5) and the housing (2), said magnetic circuit (13) being closed via the outer part (6), and in the at least one closed magnetic circuit (13) an inner permanently magnetic magnet means (16) is provided on the inner part (6), andsaid at least one magnetic circuit (13, 13â€² and 13.â€² ) passes only twice through the inner part (5) and the housing (2) and is guided outside the housing (2) via the outer part (6) around the housing (2).