| 摘要 |
An apparatus, for preparing the outer surface of the end region of pipes made of plastics, that comprises anchoring elements, which are fixed to the end region of the pipe, and to which an axial threaded pin is movably coupled so that it is constrained to perform a longitudinal rotary and translational motion, supporting means for supporting at least one tool being coupled to the pin. The anchoring elements comprise an annular coupling element for first ends of first-class lever systems that are arranged at least partially radially and are angularly equidistant and support, so that they are articulated substantially in a rocker-like fashion to second ends, elements for resting on the inner wall of a pipe. The coupling element is adjustably movable along a tubular supporting element with which the threaded pin engages internally, a disk protruding from the supporting element, the lever systems being pivoted to the disk and being articulated so as to modify their inclination with respect to the axis and keep the elements pushed against the pipe wall.
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