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US Patent: 3,678,792
Metal plate shears
Patentee:
Frank Dvorak (exact or similar names) - Cosmos, MN

USPTO Classifications:
100/291, 83/459, 83/461, 83/588, 83/627, 83/635, 83/636, 83/639.7, 83/699.11

Tool Categories:
metalworking machines : metal shearing machines

Assignees:
None

Manufacturer:
Uni-Hydro Inc. - Cosmos, MN
Dynamic Specialties - Cosmos, MN

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 15, 1970
Granted: Jul. 25, 1972

Patent Pictures:
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Uni-Hydro Inc.
Description:
"A metal plate shears for cutting large sheets of metal in which four rollers are hydraulically slid between a guide way and four inclined ramps so as to force a cutting blade downward through a large metal plate. A high leverage hydraulic clamp serves to hold the plate in place during the shearing operation. The edge of the lightweight cutting blade is kept straight by a unique truss arrangement mounted on the side of the blade."

This shear was manufactured by the Dvorak family, which eventually organized as Dynamic Specialties, which became Uni-Hydro Inc.

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