| 摘要 |
<p>A filter unit is provided for filtering impurities out of liquids. The unit has a first housing member and a second housing member, at least one of which is made of stiff, but flexible and resilient, plastic material. The two housing members can be clamped together by fastening means extending centrally therethrough with a filter paper between. The first housing member is adapted to be inverted over the second housing member so that the respective peripheries of the housing members engage each other along a peripheral line of engagement while the respective central portions are apart. Sealing pressure along the line of engagement is provided by drawing said central portions relatively towards each other.</p> |
