Lower die assembly in pressing machine

Metal deforming – With means to drive tool – With means to permit tool positioning

Reexamination Certificate

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Details

C072S446000, C072S481600, C072S481700

Reexamination Certificate

active

07100417

ABSTRACT:
An improved lower die assembly is provided which allows a given lower die in a pressing machine to be replaced with another easily and in a short period of time relative to a die holder. In the lower die assembly in which a lower die is received and securely held in a die holder, the improvement comprises: a clamp means whereby the lower die when unclamped is received in the die holder so that the lower die can be extracted from the die holder upwards and then when clamped is securely held therein; and a lift means disposed below the lower die and whereby the lower die when unclamped is raised above an upper end of the die holder.

REFERENCES:
patent: 1190696 (1916-07-01), Wilzin
patent: 1234654 (1917-07-01), Gaynor
patent: 3269168 (1966-08-01), Anderson
patent: 3673908 (1972-07-01), Smith
patent: 4301673 (1981-11-01), Yonezawa
patent: 4317358 (1982-03-01), Yonezawa et al.
patent: 4485549 (1984-12-01), Brolund
patent: 4958966 (1990-09-01), Andrews
patent: 5000022 (1991-03-01), Shinkai et al.
patent: 5613693 (1997-03-01), Ramunas
patent: 6134938 (2000-10-01), Ohtsuka
patent: 2005/0103089 (2005-05-01), Yamanaka et al.

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