| 摘要 |
PCT No. PCT/IB96/00391 Sec. 371 Date Nov. 7, 1996 Sec. 102(e) Date Nov. 7, 1996 PCT Filed Mar. 11, 1996 PCT Pub. No. WO96/28257 PCT Pub. Date Sep. 19, 1996An all plastic pump for liquids has an elastic bellows in the shape of a spiral incorporates an integral spring. The turns of the bellows are arranged with contracted areas of the spiral formed with a protruding stiffening rib and sidewalls having a convex outwardly projection region.
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