Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1985-01-25
1986-12-16
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Assembling or joining
29400N, 29723, 29238, 29464, B21D 3903, B23P 1700, B23Q 300, B23D 1904
Patent
active
046285814
ABSTRACT:
An apparatus for preassembling the components of a top nozzle into a completed subassembly for later mounting on the skeleton of a fuel assembly includes a base having a plurality of bores with spring-loaded pistons disposed in the bores for yieldably supporting extension tubes of the top nozzle. The tubes can vertically move in the bores so that all of the lower retainers on the tubes will be brought into contact with a lower surface of a lower adapter plate for uniformily supporting the plate on the tubes. Also, the apparatus includes a plurality of locating pins insertable through passageways in an upper bearing plate of the top nozzle and into the upper ends of the extension tubes for aligning and guiding the extension tube upper ends into the passageways upon movement of the bearing plate against the bias of a plurality of coil springs which surround the tubes and extend between the lower adapter and upper bearing plates. A cruciform bearing plate is placed upon the upper bearing plate and interconnected by adjustable threaded members to the base for imposing a loading force upon the bearing plate so as to draw it downward toward the lower adapter plate and place the coil springs in a state of compression therebetween and cause insertion of the tube upper ends into the passageways and within upper retainers therein for connection thereto to limit upward movement of the bearing plate. An orientation plate with alignment pins is used to ensure that the extension tubes and scallop-bearing lower retainers are in the proper radial orientation.
REFERENCES:
patent: 2304927 (1942-12-01), Kane
patent: 3158051 (1964-11-01), De Mart
patent: 3781970 (1974-01-01), Ferdriksson
patent: 4539738 (1985-09-01), Antol et al.
Gjertsen Robert K.
Wilson John F.
Goldberg Howard N.
Nichols Steven
Westinghouse Electric Corp.
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