Apparatus for controlling nut runner

Details Apparatus for controlling nut runner Apparatus for controlling nut runner

1989-12-29

1991-11-05

Eley, Timothy V.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173 1, B23Q 500

Patent

active

050624911

ABSTRACT:
The output shaft of a nut runner for tightening a fastener such as a bolt is first rotated with a first torque at a first speed. When the tightening torque of the output shaft reaches a preset switching torque, the first torque first speed rotation of the output shaft is interrupted, and thereafter the output shaft is rotated with a second torque at a second speed. When the tightening torque then reaches a preset snug torque, the second torque second speed rotation of the output shaft is interrupted, and thereafter the output shaft is rotated with a third torque at a third speed. When the tightening torque reaches a preset final torque, the third torque third speed rotation of the output shaft is stopped, thus completing the tightening of the fastener.

REFERENCES:
patent: 2720803 (1955-10-01), Rice
patent: 3827750 (1974-08-01), Himmelstein et al.
patent: 3965778 (1976-06-01), Aspers et al.
patent: 4095325 (1978-06-01), Hashimoto et al.
patent: 4413396 (1983-10-01), Wallace et al.
patent: 4791838 (1988-12-01), Bickford et al.
patent: 4832133 (1989-05-01), Boys
patent: 4858312 (1989-08-01), Van Naarden

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