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US Patent: 3,945,287
Sheet shear
Patentee:
Jim Dvorak - Cosmos, MN

USPTO Classifications:
83/375, 83/624, 83/628, 83/643, 83/699.11, 83/821

Tool Categories:
metalworking machines : metal shears

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Sep. 06, 1974
Granted: Mar. 23, 1976

Patent Pictures:
USPTO pdf tiff
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Description:
"A metal plate shears for cutting large sheets of metal includes a fixed blade, and a movable blade cooperable therewith. The movable blade is mounted on a plate having a plurality of circular apertures therein. Discs are mounted in these apertures, the discs being eccentrically supported, the axes of the eccentrics being in the same angular relation to and the same angular relation from, the centers of the discs. Arms are secured to the discs, and hydraulic means are provided for rotating the discs about their eccentric axes. Rotation of the discs lowers the plate bearing the movable cutting knife past the fixed knife, shearing off a sheet inserted between the blades."

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