US Patent: 4,575,702 - Permanent magnetic chuck


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US Patent: 4,575,702

Permanent magnetic chuck

Patentees:

Hiroshi Iwasaki (exact or similar names) - Tokyo, Japan

Takeshi Nitta (exact or similar names) - Ebina, Japan

USPTO Classifications:

335/286, 335/288, 335/295

Tool Categories:

metalworking machines : grinders : magnetic chucks

work holding : magnetic chucks

Assignees:

Fuji Jiko Kabushiki Kaisha - Tokyo, Japan

Manufacturer:

Fuji Jikoh Ltd. - Tokyo, Japan

Witnesses:

Unknown

Patent Dates:
Applied:	May 22, 1984
Granted:	Mar. 11, 1986

Patent Pictures:

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Description:

The manufacturer name is taken from a magnetic chuck; the assignee name is given here as rendered on the patent. The innovation here is an arrangement of the poles of the permanent magnets which provide improved residual magnetism characteristics and also greatly reduces the force required to release the chuck.

Fuji Jikoh, Ltd., is now the Magnet Applied Equipment Division of Hishiko Corp.