| 摘要 |
A liquid-dispensing structure includes: an outer cylinder (15,23) with a one-way valve at its lower end to allow a liquid to flow into the outer cylinder (15,23); a hollow piston being slidable inside the outer cylinder (15,23) and having a pair of liquid-tight portions formed with circular convex portions (104,105) around its outer circumferential surface in positions apart in an axial direction; and an inner cylinder for dispensing a liquid, which reciprocates inside the outer cylinder (15,23) so that the piston moves in a piston-sliding area of the inner cylinder having an opening through which the liquid flows. The opening is closed when the piston is at a lower position and is opened when the piston is at an upper position.
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