| 摘要 |
A dispenser (10) for flowable, viscous material (52) includes a housing (12) comprising a main body (18) and door (20), and a reservoir (50) for the material (52) with an elongated, synthetic resin deformable outlet tube (80) presenting an outlet end (82) coupled to the reservoir (50). A flow-controlling assembly (16) including a tube-engaging element (84, 132, 150, 158) and an actuator linkage assembly (86, 130, 144, 154); these components together with a pneumatically operated piston (54) within reservoir (50) allows precise on-off operation of the dispenser (10). In the flow-permitting position, the element (84, 132, 150, 158) is adjacent the tube (80). When it is desired to terminate material flow, the actuator linkage assembly (86, 130, 144, 154) is operated to cause the element (84, 132, 150, 158) to move into deforming engagement with the tube (80) against a backing surface (41); continued movement of the element (84, 132, 150, 158) along the length of the tube (80) in a direction away from outlet end (82) generates a suction force causing material (52) adjacent the end (82) to be drawn into the confines of the tube (80), preventing air-drying of material (52) at end (82).
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