Process for making a joint with a torque-limited collar

Metal working – Method of mechanical manufacture – Assembling or joining

Patent

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Details

295251, 411 1, 411 2, B23P 1100

Patent

active

048582999

ABSTRACT:
Axially-extending troughs in a bark of an internally-threaded collar receive setting balls of a driver that apply a torque to the collar through the balls bearing on the walls of the troughs. At a predetermined pre-load, the balls fail the bark and plow through it to develop circumferential furrows, and the torque application on the collar ends. A second torquing with balls at a different axial position fails the bark again at the same pre-load to compensate for any relaxation after the first torque application.

REFERENCES:
patent: 2940495 (1960-06-01), Wing
patent: 3311147 (1967-03-01), Walker
patent: 3460428 (1968-03-01), Charles
patent: 4383353 (1983-05-01), Stencel
patent: 4682520 (1987-07-01), Gray
patent: 4759237 (1988-07-01), Fauchet et al.

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