Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Work or object holding type
Reexamination Certificate
2007-01-09
2007-01-09
Enad, Elvin (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Work or object holding type
C335S291000
Reexamination Certificate
active
11106333
ABSTRACT:
A permanent magnet chuck for holding or lifting workpieces is formed of two overlying/underlying flat surfaced chuck layers having a common center of rotation. In each chuck layer an even number of permanent magnet plates radiate from the center of rotation at equal angles with blocks of magnetically soft material between them. The permanent magnet plates are magnetized so that the interposed soft magnet blocks exhibit alternating N-S magnetic polarities. The organization of the permanent magnet plates and soft magnet bodies is matching and complementary so that relative rotation of the chuck layers magnetically activates or de-activates the chuck.
REFERENCES:
patent: 2972485 (1961-02-01), Ferchland
patent: 3968986 (1976-07-01), Nagata
patent: 4250478 (1981-02-01), Cardone et al.
patent: 4314219 (1982-02-01), Haraguchi
patent: 4542890 (1985-09-01), Braillon
patent: 5435613 (1995-07-01), Jung
patent: 6076873 (2000-06-01), Jung
Enad Elvin
GM Global Technology Operations Inc.
Marra Kathryn A.
Rojas Bernard
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