Electric torsion-controlled screwdriver with an improved automat

Details Electric torsion-controlled screwdriver with an improved automat Electric torsion-controlled screwdriver with an improved automat

1986-07-02

1987-12-15

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81478, 173 12, 173 935, B25B 23157

Patent

active

047124563

ABSTRACT:
An electric screwdriver with an improved automatic turn-off device has a novel clutch mechanism with a upper clutch member and a lower clutch member, a switch device for controlling the driving means according to the tightness of a screw or nut on a workpiece and a switch device supporting means with a force absorbing spring, wherein said upper clutch member has two bottom substantial triangular cam protrusions, each of which has two arcs with different curvature and the lower clutch member has a flange portion with two holes and ball members whereby they are arranged and assembled in a simple mechanism for the user to use conveniently and effectively.

REFERENCES:
patent: 4231270 (1980-11-01), Totsu
patent: 4458565 (1984-07-01), Zilly et al.
patent: 4631992 (1986-12-01), Eckman

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