Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1991-11-25
1992-08-18
Cherry, Johnny D.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
294 94, B23P 1904, B66C 156
Patent
active
051387549
ABSTRACT:
A tool for axially removing a defect-containing length portion from a steam generator tubesheet primary side grips the tube length portion on both sides of the defect by radially outwardly moving gripper structure in the form of expanding ferrules (16,20) or collet spring fingers (60). Structure in the form of a central mandrel member (12, 13 or 50, 52, 54) moves axially to actuate the gripper structure. A sleeve (62) separately actuated on the mandrel (50) assists this action in the collet spring finger (60) embodiment. Movement of the defect-containing length portion requires an initial cutting of the tube-to-tubesheet weld, and for convenience, separation of the tube length portion from the remainder of the tube. Hydraulic structure (32, 56, 64) provides the motion axially of the grippers' actuators (14, 22, 23 or 58, 66) on either side of the defect either independently or together.
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Casteel James E.
Harden Charles T.
Cherry Johnny D.
Combustion Engineering Inc.
Mulholland John H.
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