Tool head structure of power screwdriver

Details Tool head structure of power screwdriver Tool head structure of power screwdriver

1998-12-04

1999-06-29

Smith, Scott A.

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

173 93, 173 935, B23Q 500

Patent

active

059154845

ABSTRACT:
A tool head structure of power screwdriver, including an engaging clutch device for indirectly controlling the rotation of a driven member. The clutch device includes weight blocks which are subject to centrifugal force and thrown outward so as to indirectly press the leaf springs to further press the brake blocks. The brake blocks extend into an inner annular section of the rotary seat to drivingly engage with the driven member in the rotary seat. Therefore, when the rotary seat is coupled with a motor, at low rotational speed, simply the rotary seat is rotated. However, when the rotary seat reaches a certain high rotational speed, the weight blocks are subject to centrifugal force to indirectly press the brake blocks to drivingly engage with the driven member, whereby the driven member is rotated to tighten or untighten the screw.

REFERENCES:
patent: 4947939 (1990-08-01), Hung
patent: 5379851 (1995-01-01), Huang
patent: 5435397 (1995-07-01), Juan
patent: 5673758 (1997-10-01), Sasaki et al.
patent: 5740892 (1998-04-01), Huang
patent: 5839518 (1998-11-01), Setsuko

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