To provide a foam dispenser capable of simplifying a structure by interposing a cover having a foam generation function and an air valve function between a pump head and a liquid piston and capable of simplifying an assembly process.
This foam dispenser includes: a cylinder part 17 comprising an air chamber 24 and a liquid introducing chamber 28; and a piston part 39 comprising a cylindrical piston member (liquid piston) 15 sliding along an inner peripheral surface of the liquid introducing chamber 28 and an air piston member 16 sliding along an inner peripheral surface of the air chamber 24; and a cover 11 having a foam generation function and an air valve function, interposed between the pump head 19 and the cylindrical piston member 15. The air piston member 16 is mounted to the cylindrical piston member 15 via a cylindrical part 16a relatively displaceably in contact with an outer circumferential surface of the cylindrical piston member 15. The cover 11 comprises a foam generation part 11a at a top surface part. A valve plate part 11c is brought into close contact with a close-contact surface 20a at an outer side of an outside air intake hole 12 to interrupt a flow channel of the outside air via the outside air intake hole 12.
Yoshiyuki Matsushima
Shuichi Maeda