Threaded insert for repairing a nuclear assembly

Details Threaded insert for repairing a nuclear assembly Threaded insert for repairing a nuclear assembly

1990-05-31

1991-11-19

Echols, P. W.

Metal working

Method of mechanical manufacture

Repairing

2940201, 2940214, 2940209, 295251, 411 60, 411182, 24297, B23P 600

Patent

active

050654900

ABSTRACT:
A bolt insert 24 with special bolt 50 provides a fastening method to secure hard metal nuclear reactor parts 12, 14, 16 provided with aligned square EDM produced openings 18, 20, 22. The insert is an elongated square internally threaded member with slots 34 defining flexing fingers 36. Fingers 36 have work engaging shoulders 42. Stop means tabs 28 at the bolt head end prevent overinsertion of the square insert 24 during the operation of pushing it into aligned square holes 18, 20, 22. Internal threads 32 of insert 24 mate with bolt threads 60 during torquing on bolt head 52 to advance bolt 50, which has tapered end 56 and pilot portion 58, to cam fingers 36 into holding position. Couterbores 30 receive stop means tabs 28 such that bolt head 52 does not bottom on insert 24. The method of producing fastening 10 removes the need for accurate threading operations on irradiated parts in the remote field.

REFERENCES:
patent: 2649884 (1953-09-01), Westover
patent: 3313083 (1967-04-01), Flora
patent: 4263833 (1981-04-01), Loudin et al.
patent: 4478545 (1984-10-01), Mizusawa et al.

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