Screw tightening apparatus

Details Screw tightening apparatus Screw tightening apparatus

1994-11-29

1996-08-27

Payer, Hwei-Siu

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

2940702, B23Q 500, E21C 500

Patent

active

055491693

ABSTRACT:
A screw tightening apparatus including an electric screwdriver having a bit shaft adapted to hold a male screw to be threaded to a female hole in a workpiece and a drive mechanism arranged to move the screwdriver toward and away from the mounting hole of the workpiece is disclosed. The screwdriver and drive mechanism are controlled in such a manner that the bit shaft is driven at a low speed and applied with a small thrust force at an initial stage during which the male screw is located to be engaged with the mounting hole. Then the bit shaft is driven at a higher speed than that at the initial stage and applied with a larger thrust force than that at the initial stage during an interim stage when the male screw is threaded into the mounting hole. Finally, the speed of the bit shaft is reduced so that the bit shaft is driven at a lower speed than that at the initial stage and applied with a larger thrust force than that at the interim stage at a final stage during which the male screw is tightened and seated on the workpiece.

REFERENCES:
patent: 4908926 (1990-03-01), Takeshima et al.
patent: 5215270 (1993-06-01), Udocon et al.
Journal of Nippondenso Engineering Society, vol. 37 No. 2 1993 "Screw Tightening Apparatus" pp. 59 and 60.

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