Power driven screwdriver

Details Power driven screwdriver Power driven screwdriver

1993-05-18

1993-12-21

Smith, Scott

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

81429, 81 583, 192 56R, B25B 2300

Patent

active

052714713

ABSTRACT:
A power driven screwdriver includes a clutch mechanism provided between a spindle for mounting a driver bit thereon and a drive member rotatably driven by a motor. The clutch mechanism includes a protrusion formed on one of the spindle and the drive member and a recess formed on the other for engagement with the protrusion. The protrusion includes a conical outer surface having a diameter decreasing toward the protrusion. The recess includes a conical inner surface which corresponds substantially to the conical outer surface of the protrusion and has a diameter increasing toward the recess. The conical outer surface has a second central axis displaced from the first central axis of the spindle or the drive member by a first distance. The conical inner surface has a third central axis displaced from the first central axis by a second distance.

REFERENCES:
patent: 3205925 (1965-09-01), Wiley
patent: 4630512 (1986-12-01), Durr
patent: 4647260 (1987-03-01), O'Hara et al.
patent: 5060733 (1991-10-01), Kress
patent: 5134909 (1992-08-01), Sasaki

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