Sankarshan Narasimha Murthy

8286723, Oct 16, 2012

Jan 7, 2011

13/120873

Daniel Puzio - Baltimore MD, US
Craig Schell - Street MD, US
Daniele Brotto - Baltimore MD, US
Andrew Seman, Jr. - Pylesville MD, US
Scott Eshleman - Parkville MD, US
Joseph Kelleher - Parkville MD, US
Sankarshan Murthy - Towson MD, US
Gabriel Concari - Eldersburg MD, US
Thomas Bodine - Glenwood MD, US
Michael Haupt - Abingdon MD, US
Curtis Watenpaugh - Manchester MD, US

Black & Decker Inc. - Newark DE

E21B 15/04

173 1, 173 2, 173176, 173183, 173217

A power tool includes an output shaft configured to rotate about a longitudinal axis, a motor drivably connected to the output shaft to impart rotary motions thereto, and a rotational motion sensor spatially separated from the output shaft and operable to determine the user-imparted rotational motion of the power tool with respect to the longitudinal axis. A controller is electrically connected to the rotational motion sensor and the motor. The controller determines angular velocity of the power tool about the axis, rotational displacement of the power tool about the axis, and/or a direction of the rotational displacement using input from the rotational motion sensor. The controller then controls the motor according to the angular velocity, the rotational displacement, and/or the direction of the rotational displacement.

8460153, Jun 11, 2013

Dec 17, 2010

12/971940

Scott Rudolph - Aberdeen MD, US
Sankarshan Murthy - Cockeysville MD, US
Daniel Puzio - Baltimore MD, US
Qiang Zhang - Lutherville MD, US
Aris Cleanthous - Baltimore MD, US
Mehdi Abolhassani - Austin TX, US
Ren H. Wang - Towson MD, US

Black & Decker Inc. - Newark DE

F16H 3/44
F16H 57/08

475290, 475317, 475344

A power tool that includes a housing, a motor, a planetary transmission, a first bearing and a second bearing. The motor is disposed in the housing and includes an output shaft. The planetary transmission has a sun gear, a plurality of first planet gears, a first ring gear and a carrier. The sun gear is driven by the output shaft. The first planet gears are driven by the sun gear and have teeth that are meshingly engaged to teeth of the first ring gear. The carrier includes a rear carrier plate and a front carrier plate between which the first and second planet gears are received. The rear carrier plate includes a first bearing aperture. The first bearing is received in the first bearing aperture and is configured to support the output shaft. The second bearing is received onto the rear carrier plate to support the carrier relative to the housing.

8584770, Nov 19, 2013

Mar 23, 2010

12/729867

Qiang Zhang - Lutherville MD, US
David C. Tomayko - Ellicott City MD, US
Sankarshan Murthy - Cockeysville MD, US
James T. Rill - Hampstead MD, US

Black & Decker Inc. - Newark DE

B23Q 5/00
E21B 3/00
E21B 17/22
E21B 19/16
E21B 19/18

173178, 173216

A power tool with a motor, a housing, a transmission, an output spindle, a front bearing and a rear bearing. The motor has an output shaft. The transmission is disposed in the housing and receives a rotary input from the output shaft. The transmission includes an input planetary stage, which has an input planet carrier, and an output planetary stage. The output spindle is driven by the transmission and has a first end, which extends at least partly through the input planetary stage, and a second end opposite the first end. The front bearing is disposed between the output spindle and the housing to support the second end of the output spindle for rotation about the spindle axis. The rear bearing indirectly supports the first end of the output spindle in the housing for rotation about the spindle axis.

8631880, Jan 21, 2014

Apr 21, 2010

12/764714

Sankarshan Murthy - Towson MD, US
Qiang Zhang - Lutherville MD, US
Daniel Puzio - Baltimore MD, US
James T. Rill - Hampstead MD, US

Black & Decker Inc. - Newark DE

B25D 15/02

173109, 173 935, 173216

A power tool with a housing, a motor, a transmission, a spindle and an impact mechanism. The motor has an output shaft that drives the transmission. The transmission has a plurality of planet gears, a planet carrier journally supporting the planet gears for rotation about an axis, and a ring gear that is in meshing engagement with the planet gears. The impact mechanism has a plurality of anvil lugs, an impactor and an impactor spring. The anvil lugs are coupled to the ring gear and are not engaged by the planet gears. The impactor is mounted to pivot about the spindle and has a plurality of hammer lugs. The impactor spring biases the impactor toward the ring gear to cause the hammer lugs to engage the anvil lugs. A power tool having an impact mechanism with an external adjusting member that can be moved to vary a trip torque of the impact mechanism is also provided.

20100033036, Feb 11, 2010

Oct 12, 2007

12/443191

Earl M. Ortt - Bel Air MD, US
Hung T. Du - Reisterstown MD, US
Sankarshan Murthy - Cockeysville MD, US

BLACK & DECKER INC. - Newark DE

H02K 7/14
H02K 15/00
H02K 1/27
H02K 1/17

310 50, 29596, 31015638, 31015421

An electric motor has a rotor and a stator. The rotor or the stator has arced permanent magnets that have essentially the same inner radius (IR) and outer radius (OR). In an aspect, the stator has a stator housing having a plurality of poles. Each pole includes a plurality of flat magnets affixed to an inner surface of the stator housing. In an aspect, flats on the outside of the stator housing key the stator assembly in a power tool housing. In an aspect, flat magnets are pre-magnetized, pre-assembled with alternating magnetic polarities, inserted into a stator housing, and remagnetized to a final, desired magnetic polarity configuration. In an aspect, pre-magnetized magnets and unmagnetized magnets are pre-assembled with unmagnetized magnets between magnetized magnets, the pre-assembled magnets inserted into a stator housing, and the unmagnetized magnets magnetized to a final, desired magnetic polarity configuration. In an aspect, pre-magnetized magnets are inserted between anchors inwardly extending from an inner surface of a stator housing with the anchors retaining each magnet placed in the stator housing between anchors from being angularly displaced by subsequently inserted magnets. In an aspect, pre-magnetized magnets are inserted in recesses in an inner surface of a stator housing with the recesses retaining each magnet placed in the stator housing between anchors from being angularly displaced by subsequently inserted magnets. In an aspect, each pole has at least three magnets, at least one of the magnets being thinner than the other magnets. In an aspect, the outer most magnets are made of magnetic material that is more resistant to demagnetization than at least one of the other magnets. In an aspect, the magnets of each pole are unevenly spaced over the pole In an aspect, a power tool includes such an electric motor.

20100071923, Mar 25, 2010

Sep 24, 2009

12/566046

Scott M. Rudolph - Cockeysville MD, US
Daniel Puzio - Baltimore MD, US
Sankarshan N. Murthy - Cockeysville MD, US
Aris Cleanthous - Baltimore MD, US
Joseph Stauffer - Conowingo MD, US
Robert S. Gehret - Hampstead MD, US
James D. Hays - Langhorne PA, US
Qiang J. Zhang - Lutherville MD, US

B25D 11/04
B25D 15/02

173 48, 173109, 173122

A power tool having a rotary impact mechanism and a mode change mechanism. The impact mechanism is driven by an output member of a transmission and includes a hammer and an anvil. The mode change mechanism includes a mode collar that is movable between a first position, in which the mode collar directly couples the hammer to the transmission output member to inhibit movement of the hammer relative to the spindle, and a second position in which the mode collar does not inhibit movement of the hammer relative to the spindle. A power tool having an impact mechanism with an external adjusting member that can be moved to vary a trip torque of the impact mechanism is also provided.

20110278966, Nov 17, 2011

May 20, 2011

13/112141

Stephen Osborne - Pikesville MD, US
Colin Crosby - Baltimore MD, US
Sankarshan Murthy - Towson MD, US
Hung T. Du - Reisterstown MD, US
Earl M. Ortt - Bel Air MD, US

Black & Decker Inc. - Newark DE

H02K 1/17

310 44

A permanent magnet electric motor has a stator and a rotor. The stator has a stator housing with at least a North pole and a South pole. Each pole includes at least two permanent magnets arranged on an inner surface of the stator housing near the pole tips and an overmold of magnetic material molded around the permanent magnets and over the inner surface of the stator between the permanent magnets. Alternatively, an overmold of magnetic material may be provided over an inner surface of the stator, where the thickness of the overmold layer is greater near tips of each pole than in the middle portion of each pole.

20110298313, Dec 8, 2011

May 20, 2011

13/112136

Stephen Osborne - Pikesville MD, US
Colin Crosby - Baltimore MD, US
Sankarshan Murthy - Towson MD, US
Hung T. Du - Reisterstown MD, US
Earl M. Ortt - Towson MD, US

Black & Decker Inc. - Newark DE

H02K 7/14

310 50

A permanent magnet electric motor has a stator and a rotor. The stator has a stator housing with at least a North pole and a South pole, each pole including permanent magnets affixed to an inner surface of the stator housing, where at least two of the magnets within a pole have dissimilar characteristics, e.g., different widths or different grades of demagnetization resistance.