US 11,752,586 B2
Position feedback control method and power tool
Brian Todd Reese, St. Charles, IL (US); and Cody Lyle Mayer, Chicago, IL (US)
Assigned to TRANSFORM SR BRANDS LLC, Hoffman Estates, IL (US)
Filed by Transform SR Brands LLC, Hoffman Estates, IL (US)
Filed on Aug. 9, 2019, as Appl. No. 16/537,042.
Application 16/537,042 is a continuation of application No. 14/927,932, filed on Oct. 30, 2015, granted, now 10,377,008.
Prior Publication US 2019/0358761 A1, Nov. 28, 2019
Int. Cl. B23B 49/00 (2006.01); B23Q 17/22 (2006.01); B25F 5/00 (2006.01); B23Q 15/06 (2006.01); B23Q 15/02 (2006.01); B23B 47/32 (2006.01); B23Q 15/08 (2006.01); B25B 23/00 (2006.01); B25B 23/147 (2006.01)
CPC B23Q 17/22 (2013.01) [B23B 47/32 (2013.01); B23B 49/00 (2013.01); B23Q 15/02 (2013.01); B23Q 15/06 (2013.01); B23Q 15/08 (2013.01); B25B 23/0064 (2013.01); B25B 23/147 (2013.01); B25F 5/00 (2013.01); B23B 2260/0482 (2013.01); B23B 2260/0487 (2013.01); B23B 2270/32 (2013.01); B23B 2270/58 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A power tool, comprising:
a chuck having a distal end configured to secure a tool; and
a motor configured to rotate the chuck and the tool secured to the chuck;
a first position sensor configured to sense and measure a first distance between the first position sensor and a workpiece, and generate a first signal that is indicative of the first distance;
a second position sensor configured to sense and measure a second distance between the second position sensor and the workpiece, and generate a second signal that is indicative of the second distance; and
a controller configured to:
store previously measured first and second distances;
compare each of the measured first and the second distances with corresponding previously stored and measured first and second distances;
generate a percent difference between the measured first distance and the corresponding previously stored and measured first distance and/or between the measured second distance and the previously stored and measured second distance; and retain the measured first distance and/or measured second distance only if the percent difference is less than or equal to a threshold percentage;
cause the first position sensor and/or the second position sensor to project a blinking pattern that conveys a warning message to a user of the power tool;
determine, based on the first signal and the second signal, a measurement of a drive depth of the tool into the workpiece; and
generate, based on the measurement, an indication of drive depth as each predetermined interval of drive depth is reached.