| 摘要 |
A dispenser pump has a fixed spout ( 15 ) on an upper component ( 10 ) which is rotatable relative to a lower component ( 11 ) adapted to be fitted to a container (not shown). For transport and storage the spout ( 15 ) is rotated so that its inner opening is obturated by the distal end of an arm ( 13 ) of the lower component which circumferentially divides its discharge compartment ( 31 ). Simultaneously an air opening ( 22 ) of the upper component is obturated by the arm ( 13 ) which also circumferentially divides an annular air chamber ( 32 ) below the discharge compartment ( 31 ). The compartment ( 31 ) and air chamber ( 32 ) are separated by an annular barrier seal ( 23 ) in rubbing contact with the internal wall of the upper component ( 10 ). By this provision the danger of leakage is so much reduced that it is not necessary to provide a mechanical lock for the pump when the dispenser is closed.
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