FIELD: human vital needs satisfaction.
SUBSTANCE: fence device (40) comprises a tubular body (64) through which liquid can be directed. And, the end portion (94) of this tubular body extends along a predetermined longitudinal direction (L). And, at the end portion (94), a circumferential edge (98) is provided that can come into contact with the portion of the container (10), and a piercing device for piercing the portion of the container (10) is also disposed at the end portion (94). According to the invention, the end portion (94) has an outer cross-section which is narrowed relative to the portion (95) adjacent to the end portion and the piercing device (42) protrudes in the longitudinal direction (L) with respect to at least one next circumferential edge portion (98) in such a way that, when feeding the sampling device (40) in the direction of the container (10), the piercing device comes into contact with the portion of the container before other portions of the circumferential edge (98).
EFFECT: increase in grinding performance.
11 cl, 13 dwg
