US Patent: 3,678,792
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| Metal plate shears
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Patentee:
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| Frank Dvorak (exact or similar names) - Cosmos, MN |
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Patent Dates:
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| Applied: |
Dec. 15, 1970 |
| Granted: |
Jul. 25, 1972 |
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Jeff Joslin
Vintage Machinery entry for Uni-Hydro Inc.
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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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