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US Patent: 3,348,836
Clamping means having hydraulic power assisting devices
Patentee:
Walter Smierciak - Elgin, IL

USPTO Classifications:
269/25

Tool Categories:
work holding : vises : bench vises

Assignees:
Wilton Corp. - Schiller Park, IL

Manufacturer:
Wilton Corp. - Schiller Park, IL

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 21, 1964
Granted: Oct. 24, 1967

Patent Pictures:
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Description:
The Wilton PowRscrew hydraulic vise was intended for manufacturing use where the vise could be set to its "open" distance and then a lever would move the jaw hydraulically a maximum of 1/2" or so. The activation was rapid and the clamping force could be quite high. It was also quite complex and was one of several Wilton attempts at a hydraulically operated bench vise.

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