Device for tightening a screw joint

Details Device for tightening a screw joint Device for tightening a screw joint

1978-03-15

1981-01-06

Herrmann, Allan D.

192 clutches and power-stop control

Clutches

Torque responsive

64 30E, 192150, F16D 4321, F16D 1308

Patent

active

042431298

ABSTRACT:
A device for tightening screw joints, comprising a motor, a torque responsive slip clutch and an output shaft, said slip clutch comprising a coil-type friction spring which by one of its ends positively engages one of the clutch halves and which, due to torsional pretensioning, engages the other clutch half by a radially acting friction grip. An adjustable auxiliary torsion spring is arranged in parallel with said friction spring in such a way as to increase or decrease the friction grip of the latter relative to said other clutch half and, thereby, increase or decrease the output torque level of the device. The device includes an adjusting mechanism for setting the torsion load of said auxiliary torsion spring.

REFERENCES:
patent: 1561506 (1925-11-01), Chilton
patent: 1561537 (1925-11-01), Hayes
patent: 2468193 (1949-04-01), Goff
patent: 3370680 (1968-02-01), Bangerter et al.
patent: 3618730 (1971-11-01), Mould
patent: 3955662 (1976-05-01), Thakston
patent: 3956905 (1976-05-01), Thakston

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