| 摘要 |
A foam dispensing mechanism (100; 600) comprises: a top (113); a cylindrical wall (112; 612) extending from a peripheral edge of the top; a piston member (170) arranged within the cylindrical wall; a dispense head (120) axially displaceable with respect to the top; a resilient bias member (130) for biasing the dispense head. The piston member has a first opening (176) and a coupling cylinder (178) arranged coaxially around said first opening. The dispense head has a cylindrical seal member (150) positionally fixed with respect to the dispense head (120), the seal member (150) having a first passage opening (156) with a valve seat (151), wherein the seal member's lower portion (157) is sealingly and axially slidably coupled to the coupling cylinder. An axially displaceable valve member (190) for blocking or releasing said first passage opening has a valve stem (192) having its end (193) coupled to the piston member. |
