Fluid discharge device

Claim 1

A fluid discharging device comprising: a storage chamber comprising soft material for containing fluid; a fixed member fixed in the device, said fixed member including a lower portion to which said storage chamber is secured, and a cylindrical piston extending from said lower portion in a direction away from said storage chamber, said cylindrical piston having a first end open to said storage chamber and a second end defining an upper surface; a first one-way valve disposed at the upper surface of said cylindrical piston and normally closing the second end of said piston, said first one-way valve movable in a direction away from said storage chamber to open the second end of said piston; a press member disposed opposite said storage chamber with respect to said lower portion and movable in the device relative to said fixed member, said press member including a cylindrical portion having a first end disposed around and slidable along said cylindrical piston at the exterior of said storage chamber and a second end defining an upper surface spaced from the upper surface defined by the second end of said piston; the cylindrical portion of said press member and the upper surface of said piston defining a suction chamber; a second one-way valve disposed at the upper surface of said cylindrical portion and normally closing said suction chamber to the exterior of the device, said second one-way valve movable in a direction away from said suction chamber to open said suction chamber to the exterior of said device; and a resilient spring disposed around said piston and said cylindrical portion outside of said storage chamber and between said fixed member and said press member, said resilient spring biasing said press member away from said fixed member.