Patent ID: 7644961

Claim:
A tube joint for connecting two pipes comprising: two pipes; each pipe being formed with a respective enlarged opening; a sealing pad arranged between the two enlarged openings of the two pipes; two reduced stepped portions; each of two ends of the sealing pad being formed with a respective one of the two reduced stepped portions; a shape of each stepped portion being matched to the enlarged openings so as to be received in the enlarged opening; whereby each stepped portion can seal the enlarged opening; a middle section of the sealing pad being between the two reduced stepped portions and being protruded between the two enlarged openings; and two covering plates; each covering plate enclosing a periphery of the enlarged opening and a periphery of the middle section of the sealing pad; and wherein each outer end of the stepped portion is an inclined surface and a corresponding surface of each enlarged opening is also an inclined surface; and wherein two first annular lips are formed around an end periphery of the stepped portions of the sealing pad, wherein when water flows through the enlarged openings, each first annular lip will deform to give a pressure to the respective stepped portion to tightly seal the enlarged openings; and wherein each stepped portion is formed with a first notch in the inner radial periphery, and each first notch provides a space for deformation of a respective first annular lip; and wherein an inner radial surface of each covering plate is formed with a second notch to define a respective second annular lip of the covering plate; each second notch provides a space for the deformation of the respective second annular lip; wherein when a force is applied to the covering plates, the second annular lips will deform to tightly seal the covering plates with the sealing pad.