Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Work or object holding type
Patent
1975-04-11
1977-04-26
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Work or object holding type
335291, H01F 720
Patent
active
040204367
ABSTRACT:
The lifting magnet disclosed herein is adapted for lifting layered pipe. The pipe is engaged by a pair of elongate pole pieces which extend transversely to the length of the pipe, the pole pieces being energized by at least one coil disposed therebetween. The pole pieces are of essentially uniform thickness over most of their length but have substantially thicker portions adjacent each end so as to provide, to a pipe contacting the ends of the pole pieces, an approach flux path of cross-sectional area substantially equal to the cross-sectional area of the approach flux path presented to a pipe contacting the pole pieces intermediate their ends.
REFERENCES:
patent: 762759 (1904-06-01), Reuter
patent: 1937216 (1933-11-01), Bahney
patent: 3120631 (1964-02-01), Morgan
patent: 3363209 (1968-01-01), Pevar
Broome Harold
O. S. Walker Company, Inc.
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