Turning – Process of turning
Patent
1979-04-23
1981-01-20
Hinson, Harrison L.
Turning
Process of turning
408 80, B23B 4100, B23B 322
Patent
active
042455294
ABSTRACT:
A mandrel arrangement for mounting a pipe machining tool for rotation relative to at least one end of a pipe elbow or other bend to be machined. A mandrel frame is provided with first and second flange portions having outer surfaces located within planes which intersect to form a predetermined angle approximately equal to the angle of the pipe bend. The frame is adapted to be positioned within the pipe bend with an outer surface of the first flange portion adjacent a first end of the pipe bend and an outer surface of the second flange portion adjacent a second end of the pipe bend. A locking means connected to the mandrel frame is adjustable between a first radially retracted condition in which the frame is free to move relative to the pipe, and a second radially extended condition in which the frame exerts an outward force against the interior of the pipe to frictionally retain the frame from movement relative thereto. A mandrel shaft means adapted to receive the pipe machining tool for relative rotation about its axis is adjustably mountable to the first flange portion such that the mandrel shaft means extends perpendicularly from the outer surface thereof and is adjustable between a plurality of positions adjacent the center of the first end of the pipe bend. The mandrel shaft means may thus be adjusted to coincide with the center of the first end of the pipe bend to receive the pipe machining tool for relative rotation thereabout. The mandrel shaft means may be similarly adjustably mountable to the second flange portion to allow machining of the two ends of the pipe bend relative to axes which intersect to form an angle equal to the predetermined angle. The first and second flange portions are provided with replaceable, peripherally located projections for contacting the inside of the pipe elbow. The locking means includes replaceable clamping elements for contacting the inside of the pipe elbow. The replaceable projections and the replaceable clamping elements may be provided in matched sets to allow utilization of the same mandrel in different sized pipe elbows.
REFERENCES:
patent: 2478318 (1949-08-01), Payne
patent: 4050836 (1977-09-01), Anders
patent: 4169396 (1979-10-01), Astle
Finkelstein Don B.
Hinson Harrison L.
Tri Tool Inc.
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