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A mandrel arrangement for mounting a pipe machining tool for rotation relative to at least one end of a pipe bend to be machined. Locating plate means are detachably mountable on the mandrel for positioning the mandrel in the pipe bend in a predetermined location. Clamping means are provided on the

A mandrel arrangement for mounting a pipe machining tool for rotation relative to at least one end of a pipe bend to be machined. Locating plate means are detachably mountable on the mandrel for positioning the mandrel in the pipe bend in a predetermined location. Clamping means are provided on the mandrel for clamping the pipe means in the predetermined location. A mandrel shaft means is detachably mounted to the mandrel adjacent one or both of the ends thereof for receiving the pipe machining tool to machine the ends of the pipe bend. The locking means is cam actuated to frictionally clamp the mandrel in the pipe bend at the predetermined position and the structure of the cam operated locking means allows utilization of the pipe mandrel in comparatively small internal diameter pipe bends.

대표청구항 ▼

A mandrel for mounting a pipe machining tool for rotation relative to at least one end of a pipe bend to be machined, and said pipe bend having an inside surface, and an outside surface, comprising, in combination: a frame means having a web portion and a first and second flange portion coupled to o

A mandrel for mounting a pipe machining tool for rotation relative to at least one end of a pipe bend to be machined, and said pipe bend having an inside surface, and an outside surface, comprising, in combination: a frame means having a web portion and a first and second flange portion coupled to opposite ends of said web portion, said first flange portion having an outer surface in a first plane, an inner surface spaced from said outer surface and adjacent said web portion, and a peripheral edge surface, said second flange portion having an outer surface in a second plane at a predetermined angle with said first plane, an inner surface spaced from said outer surface and adjacent said web portion and a peripheral edge portion, and said frame means positionable within said pipe bend with said outer surface of said first flange portion adjacent a first end of said pipe bend and said outer surface of said second flange portion adjacent a second end of said pipe bend; locking means mounted on said frame means, and said locking means comprising: a clamping means movably mounted on said frame means and movable between a retracted position wherein said clamping means is substantially free of engagement with said inside surface of said pipe bend, and a clamping position wherein said clamping means frictionally engages said inside surface of said pipe bend; cam means rotatably mounted on said frame means and operatively engaging said clamping means for moving said clamping means between said retracted position and said clamping position thereof; and cam control means movably mounted on said frame means and operatively engaging said cam means for rotating said cam means; projection means on said peripheral edge surface of said first flange portion and said second flange portion for frictionally engaging said inside surface of said pipe bend for said clamping means in said clamping position thereof to frictionally retain said frame means in said pipe bend to prevent relative movement therebetween; mandrel shaft means detachably mountable on said frame means for receiving said pipe machining tool for rotation about the axis of said mandrel shaft means, mounting means on said frame means for adjustably mounting said mandrel shaft means to at least one of said first and second flange portions of said frame means to provide said mandrel shaft means extending substantially perpendiculary outwardly from said outer surface of said at least one of said first and second flange portions; locating plate means detachably mountable on said frame means and having an engaging surface for engaging the ends of said pipe bend to position said frame means with respect thereto; whereby said frame means may be positioned at a predetermined orientation with respect to said pipe bend and clamped in said predetermined position to prevent relative movement of said frame means with respect to said pipe bend, and said mandrel shaft means may be adjusted to predetermined positions on said frame means to receive said pipe machining tool for rotation thereabout.