Clamping machine

Details Clamping machine Clamping machine

2005-06-15

2010-11-02

Mackey, James (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

C425S595000

Reexamination Certificate

active

07824167

ABSTRACT:
A new clamping machine is disclosed, which can perform a straight-hydraulic mold clamping and a tie-bar drawing-out operation in a reduced working space, and enables a shortened mold exchanging time, by effecting retraction of a movable die plate and a tie-bar drawing-out operation simultaneously. In order to draw out tie bars18from a fixed die plate10only when molds are exchanged, annular pistons36, which construct mold clamping cylinders in the fixed die plate, are provided. Abutting each piston, a pair of half nuts48A,48B are arranged and driven to engage with an engagement portion18A provided at one end of each tie bar on the side of the fixed die plate, usually, other than during the drawing out operation. A relative position of each tie bar to the half nuts is set to be able to engage with the half nuts when a right end face of the tie bar contacts with the stopper plate46. When pressure for clamping molds is increased during such engagement, the annular pistons are driven to transmit a force, for performing an initial operation, to the tie bars.

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Notification of Reason for Rejection for Japanese Patent Application 2004-179025 dated Jul. 28, 2009.

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