Pipe cutting apparatus

摘要

A pipe cutting apparatus (10), especially for cutting or machining a plastics, resin or soft-metallic pipe (20), comprises a frame (30a, 30b; 32a, 32b) for receiving the pipe (20) to be cut, and cutting means (102) rotatable by externally powered drive means (60) with respect to the pipe (20) to perform a cut, wherein the cutting means (102) comprises a cutting tool (102) carried on a pivotally mounted tool holder (100) and biased into cutting relationship with the outer surface of the pipe (20) by biasing means such as a coil spring (104). The tool holder (100) on which the cutting tool (102) is mounted preferably further comprises means (106) for limiting the maximum depth of a single given cut able to be performed in a single pass by the cutting tool (102) as it is rotated with respect to the pipe (20) held in the frame, as well as limiting means (108) for defining the maximum depth of a plurality of cuts able to be performed by that plurality of cuts of the cutting tool (102) as it is rotated through that plurality of cutting revolutions with respect to the pipe (20) held in the frame. Examples of pipe cutting or machining operations the apparatus may be used for include:
complete cutting-through of the pipe wall, eg. by a transverse cut;partial cutting-through of an outer surface or wall of the pipe;stripping of one or more outer layers from the outer surface of the pipe, to allow the pipe to be joined to another by butt-fusion;removal of irregularities from the outer surface of the pipe, for providing a cut end of the pipe with a clean, smooth outer surface of substantially uniform diameter to allow the pipe to be joined to another by electro-fusion;bevelling, chamfering or other shaping of the edge(s) of a cut pipe end, mouth or lip.

主权项

1. A pipe cutting apparatus comprising a frame for receiving a pipe to be cut, and cutting means, the cutting means and the pipe being relatively rotatable with respect to each other to perform a cut, wherein the cutting means comprises a cutting tool biased into cutting relationship with the pipe by biasing means, wherein:
the cutting means comprises the cutting tool carried on a tool holder mounted pivotally on or with respect to the frame, wherein the tool holder comprises a guide shoe in which the cutting tool is carried, the guide shoe comprises a leading edge which defines between it and a tip of the cutting tool remote from the guide shoe a first distance defining the maximum depth of a single given cut able to be performed in a single pass by the cutting tool as it is rotated with respect to a pipe held in the frame, and the tool holder additionally comprises limiting means located radially outwardly of the guide shoe, the limiting means comprising a riding edge which defines between it and a tip of the cutting tool remote from the limiting means a second distance defining the maximum depth of a plurality of cuts able to be performed by that plurality of cuts of the cutting tool as it is rotated through that plurality of cutting rotations with respect to a pipe held in the frame.