Clamping unit with a platen hydrostatically supported on a...

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface

Reexamination Certificate

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Details

C425S450100, C425S451900, C425S589000, C425S595000

Reexamination Certificate

active

07399441

ABSTRACT:
A clamping unit, particularly for an injection molding machine, includes at least one moving platen which is moveably arranged on a frame element. At least one hydrostatic support is provided in an area between the platen and the frame element for facilitating back and forth displacement of the moving platen to thereby avoid speed-dependent friction values. Operation of the clamping unit is realized by building up pressure in a hydrostatic support before the moving platen is initiated for displacement so that the moving plate is slightly raises platen in relation to the frame element. After displacement of the moving platen, the pressure in the hydrostatic support is decreased again.

REFERENCES:
patent: 3508430 (1970-04-01), Edmondson
patent: 3903993 (1975-09-01), Vorrhees et al.
patent: 4048841 (1977-09-01), Kent
patent: 4222731 (1980-09-01), Enrietti et al.
patent: 4315728 (1982-02-01), Hehl
patent: 4457684 (1984-07-01), Gram
patent: 19 04 998 (1969-11-01), None
patent: 30 06 230 (1981-08-01), None
patent: 196 02 738 (1996-08-01), None
patent: 1 375 121 (2004-01-01), None
patent: 10 193388 (1998-07-01), None
patent: 2001 079852 (2001-03-01), None

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