Free spinning, self-locking threaded fastener, and method and to

Details Free spinning, self-locking threaded fastener, and method and to Free spinning, self-locking threaded fastener, and method and to

1987-05-13

1989-04-25

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

29517, B25B 23145

Patent

active

048236535

ABSTRACT:
A fastener having an external threaded pin, and an internally threaded collar freely spinnable onto the pin so as to be set to a predetermined torque. After the predetermined torque is applied, the collar is dimpled (indented) to lock the collar to the pin. The thread can be smooth so the lock is a smooth frictional running lock, or can be interrupted so material of the collar at the indentation forms a physical lock with the interrupted thread. A tool is shown that can drive and indent the collar. A method for setting the collar is also disclosed.

REFERENCES:
patent: 1412688 (1922-04-01), Layton et al.
patent: 2730000 (1956-01-01), Critten
patent: 3603132 (1971-09-01), Holmes
patent: 3842878 (1974-10-01), Duer
patent: 4069575 (1978-01-01), Sigmund
patent: 4383353 (1983-05-01), Stencel
patent: 4393734 (1983-07-01), Thorn et al.
patent: 4601623 (1986-07-01), Wallace
patent: 4649727 (1987-03-01), Gray

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