Mechanical press device

Details Mechanical press device Mechanical press device

2007-01-23

2007-01-23

Larson, Lowell A. (Department: 3725)

Metal deforming

Including interrelated tool-mover and blankholder-mover

C072S453030, C100S269060

Reexamination Certificate

active

10524804

ABSTRACT:
The invention provides a mechanical press apparatus for both single and double uses which can press mold a large-sized blank at a high pressure by employing a single action use aspect while being of a double action type. In a mechanical press apparatus provided with a drive portion (14) which moves upward and downward an outer slide (8) and an inner slide (9) arranged in an inner side of the outer slide at a predetermined timing, an elevating plate (10) is fixed to a lower end surface of the outer slide (8) so as to oppose to a lower surface of the inner slide (9), and the lower surface is provided with an upper die (7) and a lower die (3) positioned at a lower surface thereof so as to press. Further, an upper surface portion of the elevating plate (10) is provided with a first hydraulic cylinder (11) contracted by a pressing force at a time when the inner slide (9) moves downward. Further, a second hydraulic cylinder (12) is provided between the outer slide (8) and the drive portion (14) so as to be expanded working with a pressure of a pressurized fluid supplied from the first hydraulic cylinder (11) at a time when the first hydraulic cylinder (11) is contracted by the pressing force of the inner slide (9), thereby pressing the outer slide (8) to a lower side.

REFERENCES:
patent: 6520075 (2003-02-01), Shinoda et al.
patent: 3935011 (1990-08-01), None
patent: 08-103827 (1996-04-01), None
patent: 2001-96397 (2001-04-01), None

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