Impact driver
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United States of America Patent
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-
Sep 30, 2014
Grant Date -
Mar 6, 2014
app pub date -
Aug 29, 2012
filing date -
Aug 29, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An impact driver includes a sleeve, a striking unit and a chuck. The sleeve includes a bore with an open end and a polygonal section near the open end. The striking unit can strike a bit partially inserted in the sleeve through the open end. The chuck includes a ring, a tube, a spring and a ball. The tube includes a polygonal section movably inserted in the polygonal section of the bore of the sleeve, a circular section extended through the ring, an annular rib formed thereon, a polygonal bore for receiving the bit, and at least one aperture in communication with the polygonal bore. The spring is compressed between the annular rib and the sleeve. The ball includes a portion placed in the aperture and another portion movable into the polygonal bore.
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