Magnetic screw

Details Magnetic screw Magnetic screw

1999-08-05

2000-08-29

Gellner, Michael L.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Work or object holding type

335306, 744248R, 74459, 74DIG4, H01F 720

Patent

active

06111491&

ABSTRACT:
A magnetic screw having a screw shaft of magnetic material having thread crests formed on the outer peripheral surface thereof, and a magnetic nut fitted on the outer periphery of the screw shaft. The magnetic nut includes annular permanent magnets magnetized with magnetic poles of opposite polarities on opposed sides, and annular yokes disposed such that the annular yokes are magnetically coupled with the magnetic poles of the magnets. The inner peripheral surfaces of the yokes are provided with thread crests corresponding with the thread crests of the screw shaft with a minute gap G defined therebetween such that magnetic circuits are formed between the screw shaft and the magnets through the thread crests of the screw shaft. The magnets are magnetized on their inner and outer radial surfaces with magnetic poles of opposite polarities, and the yokes are fitted in the magnets.

REFERENCES:
patent: 3777587 (1973-12-01), Hoshina et al.
patent: 5456134 (1995-10-01), Bouwer et al.
patent: 5634390 (1997-06-01), Takeuchi et al.
patent: 5687614 (1997-11-01), Hashimoto et al.

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