| 摘要 |
A hand operated non-aerosol foam dispenser comprising a combined liquid pump and air pump for mounting at the top of a container of foamable liquid, the liquid pump having a liquid cylinder (102) and a liquid piston (41) defining between them a liquid chamber (14), the air pump having an air cylinder (101) and an air piston (2) defining between them an air chamber (16), and the liquid piston (41) and air piston (2) being reciprocable together in their respective cylinders by the action of a pump plunger (1) which carries said pistons; an air inlet valve (24) and liquid inlet valve (104) being provided for the air chamber and liquid chamber respectively; an air discharge passage (17) and a liquid discharge passage (15) leading from the air chamber (16) and the liquid chamber (14) respectively, the air discharge passage and liquid discharge passage meeting one another for mixing the pumped air and liquid which passes to an outlet passage of the dispenser by way of a permeable foam regulation element (8); one or more vent openings (19) being provided to admit air into a cap chamber (51) and into the air chamber (16) through the air inlet valve (24). <IMAGE> |
