| 摘要 |
PCT No. PCT/GB96/02112 Sec. 371 Date Feb. 25, 1998 Sec. 102(e) Date Feb. 25, 1998 PCT Filed Aug. 28, 1996 PCT Pub. No. WO97/08095 PCT Pub. Date Mar. 6, 1997Apparatus comprising a worm (14) that engages with a control nut (9), such that the worm spirals through the nut into the cork (4) on insertion while the nut remains stationary, then the cork is extracted by an upward force on the nut. Mechanical advantage may feature on the insertion and/or extraction processes. Both the upward force and the torque on the worm from the nut are balanced by non-frictional forces from the cork, arising from frictional forces between the bottle (2) and the cork. Having independent insertion and extraction mechanisms enables these mechanisms to be controlled independently and enables the worm to be inserted to and extracted from different depths, depending on the length of the cork. This is not possible in previous nut corkscrews, which rely either on latches at the end of the insertion stroke or on friction between the cork and the worm.
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