| 摘要 |
A material handling device such as a pump, including a first housing part 12 having an internal surface 12A surrounded by a peripheral surface 12B, 12C facing in generally the same direction as the internal surface. A substantially longitudinally inextensible flexible diaphragm has its periphery clamped on the first clamping surface by a cooperating second clamping surface 16B, 16C, the second housing part 16 carries a rotary member 17 on which are mounted three rollers 18. A chamber 10 is formed between the diaphragm and the internal surface. Upon rotation of the rotary member, the rollers sequentially urge the diaphragm onto the internal surface to form a constriction which traverses the chamber and moves the constriction from one port 13 to another port 14 formed in the first housing part. The configuration of the pump is such that, as at least three deflectors move sequentially over the diaphragm, the sum of the distances measured along the diaphragm between the clamping points 12C,16C of the diaphragm, and the deflectors 18 adjacent thereto, and where appropriate, between the adjacent deflectors 18 remains substantially constant, thus allowing a substantially inextensible membrane to be used.
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