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GB Patent: GB-429,199
Improvements in magnetic work holders
Patentee:
William Leslie Bower - Sheffield, England

USPTO Classifications:

Tool Categories:
metalworking machines : grinders : surface grinders

Assignees:
James Neill & Co., Ltd. - Sheffield, England

Manufacturer:
James Neill & Co. - Sheffield, England

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 12, 1933
Granted: May 27, 1935

Patent Pictures:
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"Vintage Machinery" entry for James Neill & Co., Ltd.
Description:
This is the patent for the first permanent-magnet chuck. The patent number was seen on an "Eclipse" Type M146 magnetic chuck made by James Neill & Co., a firm that made hacksaw blades for the first quarter century of their existence but then started making magnetos during World War I. The company is now the Eclipse Magnetics division of Spear & Jackson. This patent, or at least the US version of it (US patent 2,053,177) was licensed by Brown & Sharpe Manufacturing Co., who made mag chucks for the North American market.

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