| 摘要 |
In a molding press having short-stroke high-power mold-clamping hydraulic rams (9) disposed around the free end of each of its guiding columns (3), the cylinder (21) of each of these rams is fixed to a platen (7) which is movable with respect to the columns (3), while its tubular piston rod (16) through which the corresponding column extends has at its free end a locking device (11) including semi-circular keys 12 which may be selectively engaged into one of a number of successive circular grooves (3b) formed in the column to lock rod (16) therewith. A second locking device (132) of quite similar construction is provided between cylinder (21) and platen (7) to selectively lock the latter with the column, the keys (112) of this second device cooperating with the same series of grooves (3b) as the first one. When the mold-clamping rams have effected their full stroke, if the latter is insufficient for the molding operation, (132) may be engaged to lock the movable platen, (11) disengaged to liberate rod (16), whereafter the ram may be contracted, (11) re-engaged, and (132) disengaged to permit another stroke of the ram and consequently a further advance of the movable platen (7).
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