Manufacturers Index - Uni-Hydro Inc.
Uni-Hydro Inc.
Cosmos, MN, U.S.A.
Company Website: http://www.unihydro.com/index.html
Manufacturer Class:
Metal Working Machinery
This page contains information on patents issued to this manufacturer.
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USPTO's for finding information on machinery patents.
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3,004,458
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Oct. 17, 1961
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Hydraulic powered oscillating shear
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Joe R. Dvorak |
Cosmos, MN |
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. |
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3,678,792
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Jul. 25, 1972
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Metal plate shears
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Frank Dvorak |
Cosmos, MN |
"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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3,899,950
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Aug. 19, 1975
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Bar shear
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Jim Dvorak |
Cosmos, MN |
"A bar shear is provided including a pair of side plates and an intermediate moveable plate. The moveable plate includes a circular aperture accommodating a disc. A shaft means offset from the center of the disc causes movement of the moveable plate as the discs are rotated about the offset shaft means. Cooperable notches are provided in the side plates and moveable plate. Upon movement of the moveable plate, a bar or strip of metal or the like is sheared off by the moveable plate."
This shear was manufactured by the Dvorak family, which eventually organized as Dynamic Specialties, which became Uni-Hydro Inc. |
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3,945,287
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Mar. 23, 1976
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Sheet shear
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Jim Dvorak |
Cosmos, MN |
"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."
This shear was manufactured by the Dvorak family, which eventually organized as Dynamic Specialties, which became Uni-Hydro Inc. |
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4,054,075
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Oct. 18, 1977
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Shear mechanism
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Jim Dvorak |
Cosmos, MN |
This patent improves on the inventor's previous patent 3,899,950 which "has proved to be highly successful. Even though my patented shear has performed admirably, it still requires a number of moving parts and its cost, while less than most comparable prior art devices, has presented a challenge to provide a shear mechanism that will be even less expensive... Briefly, my invention comprises two upstanding fixed plates having a movable plate sandwiched therebetween. The several plates each have a notch extending inwardly from one edge, one fixed plate having a detachable "
This shear was manufactured by the Dvorak family, which eventually organized as Dynamic Specialties, which became Uni-Hydro Inc. |
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4,907,481
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Mar. 13, 1990
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Powered press with manual punch and die alignment capability
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Charles J. Dvorak |
Cosmos, MN |
This invention relates to a die alignment mechanism for the press portion of a combination press and shear, i.e., an ironworker. The shear mechanism is that of patent 4,054,075. |
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Powered press with manual punch and die alignment capability
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Jim Dvorak |
Cosmos, MN |
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5,170,689
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Dec. 15, 1992
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Metal working machine
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Jim Dvorak |
Cosmos, MN |
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