US Patent: 4,828,474 - Hydraulic cylinder device for platen spacing indication and control


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US Patent: 4,828,474

Hydraulic cylinder device for platen spacing indication and control

Patentee:

Ronald Ballantyne (exact or similar names) - Burlington, ON Canada

USPTO Classifications:

100/258A, 100/258R, 100/46, 264/40.5, 425/150, 425/167, 425/171, 425/411

Tool Categories:

metalworking machines : metalworking presses : hydraulic metalworking presses

Assignees:

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

Manufacturer:

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

Witnesses:

Unknown

Patent Dates:
Applied:	Sep. 24, 1987
Granted:	May 09, 1989

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for John T. Hepburn, Ltd.

Description:

"A press has upper and lower platens which can be moved towards and away from one another. Four hydraulic leveling cylinders are mounted in a vertical orientation on the lower platen for purposes of platen parallelism control..."