Handy tube pump

Claim 1

A tube pump for transferring liquid from one place to another place, comprising: a chamber, a suction tube having a first end connected to the chamber and a second end adapted to be situated in a place where liquid to be transferred is held, a discharge tube having a first end connected to the chamber and a second end adapted to be situated in another place where liquid is to be transferred, a bellows member having an opening at an upper end, said bellows member being adapted to be gripped by a user's hand and connected to the chamber to communicate therewith so that when the bellows member squeezed by the hand of the user provides negative pressure to the chamber, liquid is sucked into the chamber through the suction tube, and when the bellows member is squeezed by the hand of the user to thereby provide positive pressure to the chamber, liquid in the chamber is forced to exit from the chamber through the discharge tube, and a valve member attached to the opening of the bellows member, said valve member including a threaded cap securely connected to the opening and having an aperture passing therethrough, a cover having a stem extending from the cover, said stem having an end and a diameter smaller than that of the opening so that when the stem is located in the aperture, an annular space is formed inside the aperture, a seal situated around the stem adjacent to the end thereof, and a spring situated around the stem and located between the cover and the threaded cap to urge the cover upwardly so that the annular space is normally sealed by the seal, and when the cover is pushed by the user against the force of the spring, the inside of the bellows member communicates with atmosphere through the annular space.