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US Patent: 5,156,782
Maintaining press platens in parallel relationship
Patentee:
Ronald Ballantyne - Burlington, ON Canada

USPTO Classifications:
100/258A, 100/46, 264/320, 264/40.5, 425/149, 425/150

Tool Categories:
metalworking machines : metalworking presses : hydraulic presses

Assignees:
John T. Hepburn, Ltd. - Mississauga, ON Canada

Manufacturer:
John T. Hepburn, Ltd. - Mississauga, ON Canada

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 02, 1991
Granted: Oct. 20, 1992

Patent Pictures:
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"Vintage Machinery" entry for John T. Hepburn, Ltd.
Description:
"Press platens are maintained parallel in critical central regions proximate to a mold between the platens. Leveling cylinders acting between the platens to resist downward action of a central ram on a movable platen..."

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