| 摘要 |
A dosing device 1 for dispensing liquid from a container 10 in which flow through flow openings 23 to an outlet tube 44 is blocked after controlled delay by an obturator (3, Fig 4) moveable within a control chamber 29 mounted in a container neck 101 behind the outlet tube 44. Movement of the obturator is governed by restricted flow through control openings (28, Fig 4) at the rear of the control chamber. Restoration of the obturator to the back of the control chamber facilitates repeated dosing. An elastomeric element 6 of resiliently deformable material promotes a seal to achieve a cleanly defined dose. The elastomeric element 6 coats the surface of the obturator and / or the outlet tube 64 to cut off the flow. The elastomeric element 6 also provides a one-way flap valve element 63 for blocking the flow openings 23 to enable rapid recovery after a dosing operation. |
