Patent ID: 7938298

Claim:
A hand-operated pump comprising: a button having a discharge hole; a housing constituting the external appearance of a pump; a closure coupled with an outer surface in an upper portion of the housing to mount the housing in a container; a housing cap for connecting the housing to the closure, and for sealing an inner space of the housing from the outside; a stem having a horizontal passage which communicates with the inner space of the housing and a vertical passage which communicates with the horizontal passage, wherein the stem vertically moves while protruding from the upper end of the housing; a shaft connected to a lower end portion of the button, wherein the shaft vertically moves along the inner surface of the housing cap for guiding the vertical movement of the shaft, while being coupled with an outer surface of the stem, and the button is mounted in the upper end of the shaft; a piston which vertically moves along an inner wall of the housing while being mounted in an lower portion of the stem; a compression spring disposed between the button and the housing cap to provide restoring force to the shaft during pumping; and an opening and closing member disposed in the lower end of the inner space of the housing to open and close an introducing hole in the lower end of the housing during pumping, wherein a vertical extending portion is disposed in the lower end of the stem, wherein the opening and closing member has a hollow portion whose upper end is opened and has radial protrusions disposed on the outer side surface thereof toward the outside, and wherein the vertical extending portion moves while being attached to the inner surface of the hollow portion of the opening and closing member.