Screw fastening device

Details Screw fastening device Screw fastening device

1991-07-26

1993-01-12

Watts, Douglas D.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 573, 173163, 475178, B25B 7100

Patent

active

051780461

ABSTRACT:
A screw fastening device comprising a casing, a motor connected to the casing, a block body rotatably housed in the casing and having a pair of axially spaced plate portions, a plurality of torque transmitting pins each rotatably supported on the plate portions of the block body, the pins having eccentric cam portions, respectively, and being rotated by the motor, an externally toothed gear formed with engagement portions engaged by the eccentric cam portions of the torque transmitting pins, an internally toothed gear fixedly mounted in an inner periphery of the casing so that it can engage with the externally toothed gear, the internally toothed gear being slightly different in number of teeth from the externally toothed gear, and a rotational output shaft connected to either one of the plate portions of the block body. The externally toothed gear is given an eccentric motion and rotated by the rotations of the torque transmitting pins, and the block body is rotated by the rotation of the externally toothed gear.

REFERENCES:
patent: 3129611 (1964-04-01), Lee
patent: 4448098 (1984-05-01), Totsu
patent: 4639996 (1987-02-01), Fullmer
patent: 4656891 (1987-04-01), Durand
patent: 4690010 (1987-09-01), Matsumoto et al.
patent: 4751853 (1988-06-01), Disset

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