Apparatus for the remote unscrewing and extraction of an assembl

Details Apparatus for the remote unscrewing and extraction of an assembl Apparatus for the remote unscrewing and extraction of an assembl

1989-11-15

1991-12-03

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

29257, 81 13, 269249, G21C 1932

Patent

active

050698613

ABSTRACT:
The apparatus comprises a pole (32), a C-shaped frame (34) fastened to one end of the pole (32) and having two branches (35, 36) substantially parallel to one another and an adjoining part (37) between the two branches, an extraction screw (40) engaged in an internally threaded hole passing through one branch (35) of the frame (34) and having one end forming a punch (50) directed towards lthe inside of the frame (34), and a means (43) for the remote actuation of the extraction screw (40) by screwing or unscrewing. The apparatus also possesses a centring ring (47) arranged round a smooth part of the extraction screw located between its threaded part and its end (50) forming the punch. Unscrewing is carried out by exerting a torque about the axis of the screw (16a) to be extracted, by means of the pole (32) and the frame (34), after the extraction screw has been tightened. The apparatus can be used particularly for carrying out the unscrewing and extraction of screws for the fastening of springs (27) of the fuel assembly of a nuclear reactor.

REFERENCES:
patent: 1380071 (1921-05-01), Marzyck
patent: 1412961 (1922-04-01), Periolat
patent: 1639111 (1927-08-01), Rotsch
patent: 1918944 (1933-07-01), Wells
patent: 2535638 (1950-12-01), Jones
patent: 3997152 (1976-12-01), Sass et al.
patent: 4690593 (1987-09-01), Nee et al.
patent: 4729158 (1988-03-01), Williams

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