Patent ID: 7417387
Filing Date: 2008-08-26
Classification: H02K

Abstract:
1. A device for generating a motive force, comprising: a tubular housing having opposite first and second open ends; a driving member movably disposed in said tubular housing, and including a magnet, said driving member being movable relative to said tubular housing between first and second positions that are respectively proximate to said first and second open ends of said tubular housing; and a magnetic unit including first and second magnets, each of which covers a respective one of said first and second open ends of said tubular housing; wherein a polarity of a magnetic field of one of said magnet of said driving member and said magnetic unit is reversed when said driving member moves to the first position such that said first magnet repels and said second magnet attracts said magnet of said driving member, thereby causing movement of said driving member to the second position; and wherein the polarity of the magnetic field of said one of said magnet of said driving member and said magnetic unit is reversed when said driving member moves to the second position such that said second magnet repels and said first magnet attracts said magnet of said driving member, thereby causing movement of said driving member to the first position.