Patent ID: 7464472
Filing Date: 2008-12-16
Classification: B23D

Abstract:
1. A pipe cutting apparatus, comprising a body, a cutter head ( 1 ) bearing-mounted rotatably on the body, having a centre rotation axis (C) and having a cutting gap ( 2 ) which opens radially sideways for receiving a pipe to be cut, pipe securing elements ( 8 ) for fixing the pipe on said centre rotation axis (C) immovably relative to the body, support rolls ( 21 ) in the cutter head ( 1 ) for supporting the pipe during a cutting process, and a cutting blade ( 22 ) in the shape of a sharp-edged disk present in the cutter head ( 1 ), which, during rotation of the cutter head ( 1 ), is adapted to be advanced towards the centre rotation axis (C) for cutting the pipe, characterized in that the cutter head ( 1 ) is provided with a shifting and locking mechanism ( 12 - 20 , 28 - 40 ) for the support rolls ( 21 ), which, regardless of the diameter of a pipe to be cut, shifts and locks the support rolls ( 21 ) with a single drive and/or control against the surface of a pipe for cutting support, and wherein said shifting and locking mechanism further comprises: a slotted crank plate ( a crank plate shaft ( a freewheel clutch (