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 (exact or similar names) - Cosmos, MN

USPTO Classifications:

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

Tool Categories:

metalworking machines : metal shearing machines

metalworking machines : metalworking machine mechanisms : hydraulic apparatus

Assignees:

None

Manufacturer:

Scotchman Industries - Philip, SD

Witnesses:

Unknown

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

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Uni-Hydro Inc.
Vintage Machinery entry for Scotchman Industries

Description:

This is the patent for the well-known Dvorak ironworker. It was apparently manufactured by the Dvorak family for a time, and then in 1966 or '67 the patent rights were acquired by Scotchman Industries, which continues to manufacture several models of hydraulically driven ironworkers. Meanwhile, the Dvorak family came up with improved designs which were manufactured by the Dvorak family which eventually organized as Dynamic Specialties, which became Uni-Hydro Inc.