| 摘要 |
<p>A mould for forming stackable vessels from plastic sheet has an upwardly diverging frusto-conical skirt with circumferentially spaced radial slots in its lower part, an ejector head of greater dia. than the lower end of the skirt engaged with it, radially mobile teeth lodged in the slots, and an eccentric gear driven by a toothed rack to move the teeth.</p> |
