Electromagnetic actuator

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device

Reexamination Certificate

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Details

C335S229000, C335S255000, C335S256000, C335S264000, C335S266000, C335S267000, C335S268000

Reexamination Certificate

active

10555996

ABSTRACT:
Electromagnetic actuator for operating at least one movable contact of a switch into a switched-on position or a switched-off position. The electromagnetic actuator (1) has a first magnetic circuit for making a movable (3) and a fixed (4) pole body move towards one another and a second magnetic circuit, separate from the first magnetic circuit, with a permanent magnet (9) and a retaining plate (10). A switching-off coil (15) operates to counteract the magnetic field in the second magnetic circuit so that the actuator (1) can return to a switched-off position. In the axial direction of the actuator (1), the switching-off coil (15) is positioned Gloser to the retaining plate (10) than the permanent magnet (9), as a result of which more effective operation of the actuator is possible. Furthermore, the actuator is constructed from cylindrical elements that are easy to produce and to assemble.

REFERENCES:
patent: 4072918 (1978-02-01), Read, Jr.
patent: 4127835 (1978-11-01), Knutson
patent: 4419643 (1983-12-01), Ojima et al.
patent: 4550302 (1985-10-01), Watanabe et al.
patent: 5034714 (1991-07-01), Bratkowski et al.
patent: 5864274 (1999-01-01), Steingroever et al.
patent: 6130594 (2000-10-01), Morant et al.
patent: 6262648 (2001-07-01), Lammers
patent: 1 225 609 (2002-07-01), None
patent: WO 99/14769 (1999-03-01), None

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