| 摘要 |
A clay extrusion apparatus has a cylinder open at the top for a rod which depresses the piston. At the bottom of the cylinder is an outer die held in place by a cap bolted to the cylinder. Within the opening of the outer die is an inner die supported by a stem extending up into the cylinder and attached at its upper end to a spider-like bracket which fits centrally within the cylinder and the lower ends of the legs of which are supported by the outer die. The inner and outer dies are changeable to form different outside and inside shapes of hollow clay extrusions. The inner die and its support may be removed to produce solid shapes.
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