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US Patent: 3,004,458
Hydraulic powered oscillating shear
Patentee:
Joe R. Dvorak - Cosmos, MN

USPTO Classifications:
100/233, 100/266, 100/269.2, 74/102, 83/589, 83/601, 83/607

Tool Categories:
metalworking machines : metal shears
metalworking machines : metalworking machine mechanisms : hydraulic apparatus

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Jun. 03, 1955
Granted: Oct. 17, 1961

Patent Pictures:
USPTO pdf tiff
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Description:
This is the patent for the well-known Dvorak ironworker. In 1966 or '67 the patent rights were acquired by Scotchman Industries, which continues to manufacture several models of hydraulically driven ironworkers.

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