| 摘要 |
<p>Plastic Archimedean screw with an integral axial core, partic. for toys, is composed of a number of screw flight sections integral with an axial core portion, pref. tubular, connected in series in the axial direction, the screw flight extending over any desired area up to a max. of 360 degrees and along the whole effective length of the axial core portion. Provides a simple and cheaper method of producing plastic Archimedean screws with integral axial core of any desired length.</p> |
