| 摘要 |
The invention concerns a manual liquid dispenser which has an inner surface (15) formed on a cylindrical upper portion (45) of a mounting member (40) which opposes an end of a guide cylinder (52) and which is supported on the neck portion (4) of a container (3) for the liquid. An annular piston (59) has its main part lying within the guide cylinder (52) when the piston is in its normal position of rest under the action of a helical spring (63) acting on it, and is provided with two flexible valves (60, 61) on its lower end portion lying adjacent the end of the guide cylinder (52) remote from the mounting member (40). |
