Patent ID: 8573448

Claim:
A lotion pump, comprising: a nozzle head only including an integrally formed nozzle head body, the nozzle head body having an outlet and an inlet; a plunger connected with the inlet of the nozzle head, in which an upper one-way valve is disposed, the plunger only including an integrally formed plunger body, the plunger body having an upper portion that has a larger inner diameter and a lower portion that has a smaller inner diameter, an outer diameter of the upper portion of the plunger being larger than an outer diameter of the lower portion of the plunger, the upper and lower portions of the plunger body being connected at a stepped portion of the plunger, a valve seat being formed between the upper and lower portions, the plunger body further having an integrally formed sealing plug extending downwardly therefrom; a housing, in which a lower one-way valve is disposed, the housing only including an integrally formed housing body, the housing body having an integrally formed sealing ring engageable with the sealing plug to prevent lotion from leakage; a container cap only including a cap body secured to the housing body; and a return spring disposed in the housing for restoring a position of the nozzle head, an upper end of the return spring being positioned to abut a head of the plunger, a lower end of the return spring positioned to abut the housing, wherein the nozzle head is operable between a locked position where axial movement of the nozzle head relative to the housing is prevented and an unlocked position where the nozzle head is axially movable relative to the housing, wherein a first air groove is formed between an outer side of an upper end of the housing and a corresponding portion of the container cap, a second air groove is formed between an inner side of the upper end of the housing and a corresponding portion of the container cap, and a gap is formed between an upper end surface of the housing and a corresponding portion of the container cap, the first air groove, the second air groove and the gap communicate with each other to allow air outside of the housing to communicate with air inside the housing.