Importance

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Abstract

The connection between a residential junction pipe or the like and a sewer pipe is repaired by a cutter head that is led into the junction pipe and operates essentially with its front face. Thereby, it is unnecessary to locate junction pipes in a replaced sewer pipe as is the case with known methods. The cutter head is fastened at the front end of a flexible shaft. A feeding device feeds the cutter head during cutting. A fastening mechanism centers the device in the pipe to be worked. The cutter head includes an eccentric head rotatable about the center axis of the pipe and a cutter wheel that is rotatably supported in the eccentric head that moves in a circular orbit in the pipe. The fastening mechanism includes three radially adjustable supporting elements and a hydraulic piston-cylinder unit pressing the supporting elements against an inner wall of the pipe. After fastening of the supporting elements, the cutter head is moved by the feeding device in the pipe to achieve cutting.

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First Claim