Switchable permanent magnet holding device

Details Switchable permanent magnet holding device Switchable permanent magnet holding device

1980-07-25

1982-05-11

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Work or object holding type

335302, H01F 720

Patent

active

043296734

ABSTRACT:
A switchable permanent magnet holding device in which a permanent magnet rotatably disposed within a bore in a magnetic circuit block is rotated, so that the magnetism acting surfaces of the magnetic circuit block are brought into an exciting state for retaining a magnetic substance thereon and into a non-exciting state for releasing the magnetic substance therefrom. The permanent magnet is pressed against a stopper for impeding rotation thereof, due to a gyromagnetic force acting across the permanent magnet and the magnetic circuit block when the permanent magnet is rotated to a position in which the magnetism acting surfaces of the block become exciting.

REFERENCES:
patent: 2972485 (1961-02-01), Ferchland
patent: 4055824 (1977-10-01), Baermann

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