Patent ID: 8667876

Claim:
A pipe cutting apparatus, comprising a tubular or box-like frame ( 1 ), a pipe clamp ( 9 ) inside the frame for immobilizing a pipe (P) to be cut, an annular blade carrier ( 3 ) rotatably bearing-mounted on the frame and provided with a central opening for the pipe to pass through, one or more blade arms ( 4 ) in attachment with the annular blade carrier ( 3 ) for movement mainly in a radial direction or in a slightly off-radial direction, a cutting blade ( 5 ) mounted on the blade arm ( 4 ), and means for actuating the blade arm ( 4 ) to enable feeding the cutting blade ( 4 ), rotating outside the pipe, towards the pipe for cutting the same by shearing, characterized in that the means for actuating the blade arm ( 4 ) include a spiral groove disc ( 6 ) rotatably bearing-mounted alongside the annular blade carrier ( 3 ), featuring a spiral groove ( 7 ) and a transition fin ( 8 ) extending from the blade arm ( 4 ) to the spiral groove ( 7 ), as well as elements ( 11 , 12 ) for rotating the annular blade carrier ( 3 ) and the spiral groove disc ( 6 ) at a desired rotation speed ratio relative to each other.