US Patent: 3,004,458 - Hydraulic powered oscillating shear


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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.