| 摘要 |
<p>Apparatus (10) for breaking threaded pipe connections (12) includes a housing ring (16) that is, in use, rotatably connected to a frame (14), the housing ring (16) defining an aperture (10) for, in use, receiving a pipe section therethrough. At least three cams (20) are pivotally connected to the housing ring (16). A guide ring (18) is rotatable relative to the ring (16) between an open position in which the cams (20) are, in use, radially spaced from a pipe section extending therebetween and a clamped position in which the cams (20), in use, engage with and clamp the pipe section. The guide ring (18) defines at least three ramps (24), each ramp (24) causing a corresponding cam (20) to ride up the ramp (24), pivot and protrude radially inwards as the guide ring (18) is rotated from the open position to the clamped position; and includes at least three fingers (26) that bear against the cams (20) to cause the cams (20) to pivot and retract radially outwards as the guide (18) is rotated from the clamped position to the open position. Such that, at least a portion of each ramp (24) and corresponding finger (26) forms a recess defined by the guide ring (18) that receives at least a portion of the corresponding cam (20) therein when the guide ring (18) is in the open position.</p> |
