PLATEN LOCKING DEVICE IN POWDERED MATERIAL COMPACTING PRESSES

摘要

In a press for compacting powdered materials into shaped articles between upper and lower punches within a cavity of a die platen, platen locking devices are provided to hold or lock a movable platen during the compacting process. Each of the locking devices comprises a wedge driving member depending from the movable platen and having a pair of downwardly converging wedging bottom end faces adapted to cooperate with a pair of oppositely arranged wedge members slidably carried on a stationary platen below said platen. The wedge members are urged toward each other by means of springs and are adapted to be locked in mutually closest positions to prevent downward movement of the wedge driving member by means of a locking key engaging or entering from below aligned bottom grooves in the wedge members. Unlocking of the device is effected by lowering the locking key to disengage it from said grooves in connection with a predetermined downward movement of the die platen above the movable platen.