| 摘要 |
A paste dispenser for dispensing doses of liquids and in particular paste-like masses has a feed pump actuated by finger pressure capable of feeding in the direction of actuation and of aspirating by means of a restoring spring, whose feed and suction valves may be controlled by differences of pressure as well as by additional mechanical forces. The dispenser has a reservoir whose volume diminishes as the product is removed, thanks to resilient walls, and a closure element linked to the feed actuating device and arranged in the product removal bore. A closed feed valve (17) lies with its planar surface (16) and with a seal (14) linked to a piston (13) on a plane and a closed suction valve (6) forms with its planar surface (5) and a front wall (4) another plane that delimits the stroke of the piston (13). Contact zones (a, b, c) are available between the suction valve (6, 26, 26') and the feed valve (17, 21, 23). A closure element (40, 52) can be moved by a lever (45, 50) in the opening direction. Finally, the piston (13) can be moved in the feeding direction. The restoring spring (35) arranged outside the pump chamber (12) is fitted between a shoulder (36) and a flange (34) linked to the piston (13). The sliding guide (30) linked to a dosing head (27, 37) has a circular edge (31) that rests on a stop (32). |
