Black Decker Inc.

Abhinav Jayakumar

David C Tomayko

Tyler Petrus

A power tool includes a housing, a motor being controlled to run at a speed between 15000 rpm and 32000 rpm, an output spindle, a rotary impact assembly configured to transmit rotational motion with intermittent rotational impacts from a cam shaft to the output spindle, a hammer of the rotary impact assembly having an inertia between 400 kg·mmand 3000 kg·mm, and a single stage compound planetary transmission including a first planet gear meshed with a sun gear and a second planet gear meshed with a ring gear, the compound planet gear being carried by a planet carrier to achieve a gear reduction ratio between 14:1 and 30:1. The power tool is configured to achieve a fastening torque of at least 900 foot-pounds (a) in a time of less than 3.5 seconds, and/or (b) with an input energy of less than 2500 Joules.

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Towson, MD, United States of America

Abhinav Jayakumar