Waiter's friend corkscrew

A waiter's-friend corkscrew consisting of:

• a handle (2),
• a neckstand (4), this neckstand being U-sectioned with a web (4a) and two flanges (4b ), being hinged at one end to one end of the handle and comprising, in each of its flanges (4b ), a notch (9) designed to bear on the rim of the container,
• a helical extractor (6) hinged to the handle (2) in the vicinity of the neckstand (4) and able to fit into this handle in the storage position,
• and a knife blade (7) that fits into the handle,
• wherein the neckstand (4, 24) comprises, beyond its juxtaposed bearing notches (9), a dorsal extension having a length of between 0.4 and 0.6 times the distance (S) between the hinge pin (3, 23) of the neckstand (4, 24) and that face (9a) of the notches which rests on the rim of the container, this extension being such that it can be held by the operator's hand and its end (4c) pressed against the neck (11) of the container, while said face (9a) of each notch (9) forms, with respect to the web (4a) of the neckstand (4, 24), an angle (b) of between 75° and 85°, in order that it is the end of each notch (9) that first bears on the rim of the container.