Housing type pipe coupling

A housing type pipe coupling comprising:

• a pair of semi-circular coupling segments each having a space for receiving end parts of two pipes each provided with a circumferential rib having a side surface nearer to the end of the pipe and a side surface farther from the end of the pipe;
• a sealing elastic ring placed in the space defined by the pair of semi-circular coupling segments to create a nonleaking union between the ends of the two pipes;
• and
• fastening means for fastening together the pair of semi-circular coupling segments;
• wherein each of the semi-circular coupling segments has pipe setting parts respectively on the opposite sides of the space,
• the pipe setting parts have recesses for receiving the circumferential ribs of the pipes,
• the recess has a pair of side surfaces having opposite end sections with respect to a circumferential direction,
• the recess of one of the pipe setting parts of the semi-circular coupling segment has a protrusion to be in contact with the side surface of the circumferential rib of one of the pipes farther from the end of the same pipe in one of end sections thereof with respect to a circumferential direction, and a protrusion to be in contact with the side surface of the circumferential rib of the same pipe nearer to the end of the same pipe in the other end section thereof with respect to the circumferential direction, and
• the recess of the other pipe setting part of the same semi-circular coupling segment has a protrusion to be in contact with the side surface of the circumferential rib of the other pipe nearer to the end of the same pipe in one of the end sections thereof with respect to the circumferential direction, and a protrusion to be in contact with the side surface of the circumferential rib of the same pipe farther from the end of the same pipe in the other end section thereof with respect to the circumferential direction.