Importance

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Abstract

This invention relates, in a clamping device in which two sets of clamping plates, each set of which comprises a pair, are provided between a pair of fixed plates on a base plate connected by tie bars passing through the tie bars, blow molds in the form of a split mold are mounted on each set of clamping plates and two sets of blow molds are arranged open- and closably between the fixed plates, and a plurality of external clamping cylinders are provided in position of both the fixed plates, a clamping device for blow molds wherein a small hydraulic cylinder whose ram stroke is very short is employed as a clamping cylinder, a plurality of such small hydraulic cylinders are disposed between blow molds arranged in two rows and between the blow molds and fixed plates, and an opening and closing cylinder is disposed between the clamping plates, whereby the opening and closing and clamping of each of the blow molds are carried out.

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First Claim