Patent ID: 7516991

Claim:
A pipework having an outer pipe having an outer wall; an inner pipe being slidably mounted in the outer pipe and having an external surface; a position hole being formed radially through the outer wall of the outer pipe and having an inner surface; an inner thread being formed on the inner surface of the position hole; and at least one locating slot being formed radially through the outer wall of the outer pipe and communicating with the position hole; a pressing element being made of a flexible material and being mounted in the position hole, contacting with the external surface of the inner pipe and having a center; an external surface; a mounting recess being formed in the center of the pressing element; and at least one locating block being formed on and protruding from the external surface of the pressing element and being mounted respectively in the at least one locating slot of the position hole; and a bolt being connected to the pressing element, being screwed with the position hole and having a body being mounted in the position hole and having a mounting segment being mounted in the position hole and having a free end; an external surface; and an outer thread being formed around the external surface of the mounting segment and being screwed with the inner thread of the position hole; and an operating segment being formed on the mounting segment; and a mounting head being formed on the free end of the mounting segment of the body and being mounted rotatably in the mounting recess of the pressing element.