Ratchet hand tool

Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head

Patent

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Details

81438, 81 632, B25B 1346

Patent

active

055289630

ABSTRACT:
A ratchet hand tool including a stop plate and an urging element for controlling clockwise or counterclockwise of a ratchet being provided on two base plates which may be grip with the hand. One end of the ratchet is provided with a joint element having a ball and an elastic ring. A rotary element is fitted onto the joint element. When a longitudinal rod is inserted into the joint element to urge against the ball inside the joint element, the ball displaces outwardly to expand the elastic ring, which in turn urges tightly against the rotary element. In cooperation with a polygonal hole of the rotary element, the longitudinal rod is caused to turn when the rotary element is rotated, so that screws may be driven in or out quickly.

REFERENCES:
patent: 916620 (1909-03-01), Shaul
patent: 4341293 (1982-07-01), Acevedo
patent: 4367664 (1983-01-01), Ekshtut
patent: 4926721 (1990-05-01), Hsiao
patent: 5142953 (1992-09-01), Lin
patent: 5144869 (1992-09-01), Chow
patent: 5309798 (1994-05-01), Markwart et al.
patent: 5392672 (1995-02-01), Larson et al.

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