US 9,812,930 B2
Control unit for a power tool
Madhur M. Purohit, Towson, MD (US); Shailesh P. Waikar, Parkville, MD (US); and Marcell E. Coates, Baltimore, MD (US)
Assigned to Black & Decker Inc., New Britain, CT (US)
Filed by Black & Decker Inc., New Britain, CT (US)
Filed on Apr. 1, 2016, as Appl. No. 15/88,676.
Application 15/088,676 is a continuation of application No. 13/712,200, granted, now 9,318,932, previously published as PCT/IB2011/002427, filed on Jun. 14, 2011.
Claims priority of provisional application 61/354,537, filed on Jun. 14, 2010.
Claims priority of provisional application 61/354,543, filed on Jun. 14, 2010.
Prior Publication US 2016/0218589 A1, Jul. 28, 2016
Int. Cl. H02K 7/14 (2006.01); H02K 9/06 (2006.01); H02K 3/28 (2006.01); H02K 3/52 (2006.01); H02K 5/22 (2006.01); H02K 21/12 (2006.01); H02K 11/20 (2016.01); H02K 11/215 (2016.01); H02K 11/33 (2016.01); H02K 11/21 (2016.01); H02K 9/22 (2006.01); H02K 11/30 (2016.01); H02K 1/27 (2006.01); H02K 7/116 (2006.01); H02K 21/16 (2006.01)
CPC H02K 9/06 (2013.01) [H02K 3/28 (2013.01); H02K 3/522 (2013.01); H02K 5/225 (2013.01); H02K 7/145 (2013.01); H02K 9/22 (2013.01); H02K 11/20 (2016.01); H02K 11/21 (2016.01); H02K 11/215 (2016.01); H02K 11/30 (2016.01); H02K 11/33 (2016.01); H02K 21/12 (2013.01); H02K 1/276 (2013.01); H02K 7/116 (2013.01); H02K 21/16 (2013.01); H02K 2203/03 (2013.01); H02K 2203/09 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A power tool comprising:
a housing;
a brushless DC motor housed inside an upper body of the housing; and
a control unit housed inside a handle of the housing, the control unit comprising a micro-controller mounted over a control circuit board; and
a variable-speed switch assembly comprising a main body mounted directly on a surface of the control circuit board, a trigger, a plunger linearly movable with the trigger with respect to the main body, a speed-sensing mechanism housed inside the main body and coupled to the plunger to generate a variable-speed voltage signal based on the position of the plunger, and at least one output pin connecting the speed-sensing mechanism of the variable-speed switch assembly directly to at least one conductive track on the control circuit board to provide the variable-speed voltage signal to the micro-controller via the at least one conductive track.