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US Patent: 3,520,527
Quick-change vise
Patentee:
Henry Persson - Bloomfield, NJ

USPTO Classifications:
269/182, 269/73

Tool Categories:
metalworking machines : drilling and boring : drill presses : drill press accessories
work holding : vises : metalworking machine vises

Assignees:
None

Manufacturer:
Float-Lock Corp. - Bloomfield, NJ
American Machine & Foundry Co. - New York, NY
Wahlstrom Float-Lock Product Co. - Libertyville, IL

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 30, 1969
Granted: Jul. 14, 1970

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Wahlstrom Float-Lock Product Co.
"Vintage Machinery" entry for American Machine & Foundry Co.
Description:
Improvements to the original quick-release Float-Lock vise of patent 2,724,295. The main improvement is a simplified shaft clamp, and there is a safety stop to prevent the half-nut from disengaging when the clamp is tightened.

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