| 摘要 |
A fluid dispenser member having a dispensing wall ( 623 ) defining an outside surface and inside surface, said wall being provided with a through dispensing orifice ( 625 ) connecting the inside surface to the outside surface, the inside surface forming a leaktight slide cylinder for a piston ( 632, 633 ) suitable for moving in leaktight contact inside said cylinder for selectively unmasking the dispensing orifice, said piston forming a wall element of a fluid chamber inside which fluid is selectively put under pressure, said fluid dispenser member being characterized in that the inside surface extends over two surface segments, namely a top segment ( 6232 ) and a bottom segment ( 6242 ), the top segment having an inside diameter that is smaller than the inside diameter of the bottom segment, the dispensing orifice being formed at the top segment, and the piston being provided with a sealing lip ( 633 ) in leaktight sliding contact with the bottom segment.
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