| 摘要 |
A dosing apparatus has a tap member and a housing member. The tap member has opposing planar surfaces which extend between opposing sides, and an aperture extends through the tap member from one opposing surface to the other. The housing member has a base plate which has opposing planar surfaces and an opening which extends through the base plate from one opposing base plate surface to the other. Two opposing housing member sidewalls each extend from the base plate and have a groove which slidably engages two opposing sides of the tap member so that the tap member is positioned between the sidewall so that one tap member planar surface faces one base plate planar surface and so that the housing member is slidably reciprocative in two opposing directions along the tap member opposing sides. The tap member aperture and base plate opening are positioned so that upon sliding of the housing member in one direction of reciprocation, the base plate opening is positioned in communication with the tap member aperture.
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