Fastener tension control system

Details Fastener tension control system Fastener tension control system

1979-05-16

1981-01-13

Krass, Errol A.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

73139, 73761, 173 1, 173 12, 364505, B23Q 1906, G06F 1520

Patent

active

042442451

ABSTRACT:
A method and apparatus for controlling final tension on a fastener being run up and set. An efficiency factor is developed and utilized for attaining predetermined final tension on a fastener, or a group of similar fasteners, being operated upon. The efficiency factor is a ratio between work on a theoretical fastener, i.e., one wherein friction load is absent in work calculations, and work on an actual fastener. Having obtained the efficiency factor, the actual torque load on a fastener to attain predetermined tension value, can be established by use of the efficiency factor.

REFERENCES:
patent: 2756622 (1956-07-01), LaBelle
patent: 4008772 (1977-02-01), Boys
patent: 4016938 (1977-04-01), Rice
patent: 4019589 (1977-04-01), Wallace
patent: 4026369 (1977-05-01), Vliet
patent: 4104778 (1978-08-01), Vliet
patent: 4106176 (1978-08-01), Rice et al.
patent: 4110829 (1978-08-01), Boys
patent: 4163310 (1979-08-01), Sigmund
patent: 4163311 (1979-08-01), Sigmund
patent: 4179786 (1979-12-01), Eshghy

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