Samuel B Woods

Author:

Samuel G. Woods

ISBN #:

0811455785

Author:

Samuel G. Woods

ISBN #:

0811473503

Author:

Samuel G. Woods

ISBN #:

0823917991

Author:

Samuel H. Woods

ISBN #:

0816183392

US Patent:

48930679, Jan 9, 1990

Filed:

May 6, 1987

Appl. No.:

7/047181

Inventors:

Pradeep Bhagwat - Baltimore MD
Stephen Smith - Raleigh NC
Samuel G. Woods - Baltimore MD

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

G05B 500

US Classification:

388817

Abstract:

The motor speed control circuit senses average back EMF as a measure of motor speed. The back EMF charges a capacitor circuit which accumulates charge and develops a voltage indicative of the motor speed. A sample and hold circuit may be used to sample the back EMF when the motor is switched off during each cycle. This voltage is compared with a reference voltage indicative of the desired motor speed. An error signal is generated by comparing the desired speed with the actual speed and this error signal is used to generate a variable duty cycle pulse train which gates the power controlling transistor on and off to control motor speed. A logic gated or SCR gated voltage boosting circuit operates in synchronism with the gating pulse train to drive the power transistor hard into saturation. This lowers the resistance of the power transistor, causing less energy dissipation as waste heat. The motor speed control circuit produces a family of torque-speed curves which maintain speed constant until a break point is reached, whereupon speed falls inversely proportional to torque.

US Patent:

60377291, Mar 14, 2000

Filed:

Jan 28, 1998

Appl. No.:

9/014451

Inventors:

Samuel G. Woods - Baltimore MD
David M. Spampinato - Hampstead MD
Paul S. White - Ellicott City MD

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02P 312

US Classification:

318375

Abstract:

A braking circuit for braking an electric motor having an armature and run and brake windings, which includes a switching circuit disposed between a source of electrical power and the run winding, this circuit being operable to disconnect the run winding from the source of electrical power. The braking circuit further includes a switching mechanism operable to connect the brake winding in order to brake the electric motor. The switching mechanism preferably connects the brake winding after a predetermined period of time has elapsed from the disconnection of the run winding. This braking circuit can be used in a saw for braking the saw's blade.

US Patent:

43412254, Jul 27, 1982

Filed:

Jul 31, 1980

Appl. No.:

6/174271

Inventors:

Stuart L. Gallant - Baltimore MD
Samuel Woods - Baltimore MD
Walter E. Palmer - Baltimore MD

Assignee:

Hittman Corporation - Columbia MD

International Classification:

A61B 504

US Classification:

128710

Abstract:

An improved electrocardiography system displays and records electrocardiograph (ECG) signals provided on multiple pickup leads attached to a patient. The system has the capability of selectively displaying standard preprogrammed lead configurations or lead groups, and provides the operator with the additional capability of programming selected leads from various groups to form a "monitor group". Selected ECG signals are routed to a four-channel oscilloscope and a three-channel strip-chart recorder, the system providing the operator with a "freeze" capability such that a signal appearing on one of the oscilloscope channels may be displayed in a stationary state on the fourth oscilloscope channel, and subsequently printed out on the strip chart recorder. The system further provides an "auto lead" capability for fully automated successive recording of test data from leads in successively accessed conventional lead groups, and further provides an "auto cycle" mode of operation for fully automated repetitive recording of test data from selected leads for operator-designated recording times and at operator-designated time intervals.

US Patent:

59376228, Aug 17, 1999

Filed:

Jul 25, 1996

Appl. No.:

8/686743

Inventors:

David A. Carrier - Baltimore MD
Samuel G. Woods - Bel Air MD
David S. Strong - Battersea, CA
Carl W. Gifford - Elizebethtown, CA
Colin M. Dyke - Augusta, CA

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

A01D 3478

US Classification:

56 119

Abstract:

A cordless electric mower having an energy management system that allows a user to operate the cutting blade motor of the mower at a wide range of user selected speeds. The mower is provided with a user adjustable throttle control which, when in the wide-open position allows the cutting blade motor to be rotated at a maximum, predetermined speed. When the throttle is set to some lesser speed, the system automatically implements a speed foldback routine whenever the mower encounters heavy loading which would result in an undesirably high current draw on the battery. When the speed foldback routine is implemented, the system limits the maximum amount of current that can be drawn by the motor until the excessive loading condition has been removed. Once the excessive loading condition has been removed, the speed foldback routine automatically increases the speed of the blade motor back up to almost the originally selected speed. This greatly improves the operating efficiency of the mower and thereby significantly extends the available operating time of the mower on a single charge.

US Patent:

50139932, May 7, 1991

Filed:

Aug 29, 1988

Appl. No.:

7/237962

Inventors:

Pradeep M. Bhagwat - Baltimore MD
Daniel S. Daniel - Knoxville TN
Samuel G. Woods - Baltimore MD

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02J 700

US Classification:

320 35

Abstract:

A battery charger 10 includes a capacitor 20 which establishes a level of current sufficient to fast charge in one-hour a battery 18 having from one to twenty cells. An SCR 16 is controlled by a timer 42 to initially delay the supply of current while determining whether the battery 18 is hot or cool. If battery 18 is cool, charger 10 proceeds to fast charge the battery. After battery 18 is fully charged, the battery heats to a temperature where a NTC thermistor 58 responds to trigger a second timer 52 which controls SCR 16 to stop the fast charging operation. Charger 10 is then controlled to prevent the charger from thereafter re-entering a fast charge mode. If battery 18 is initially hot, charger 10 is controlled to further delay the initiation of a fast charge operation until the battery cools to or below the charge-start temperature. A second NTC thermistor 90 is provided to compensate for the potential effect on the operation of thermistor 58 in response to temperature levels emanating from any environment other than from battery 18.

US Patent:

62866095, Sep 11, 2001

Filed:

Mar 16, 2000

Appl. No.:

9/526682

Inventors:

David A. Carrier - Eldersburg MD
Andrew E. Seman - Baltimore MD
Christopher R. Yahnker - Eldersburg MD
Samuel G. Woods - Bel Air MD

Assignee:

Black & Decker Inc. - Newark DE

International Classification:

H02J 700

US Classification:

173 1

Abstract:

A dual-mode system for inexpensively operating electrically powered double-insulated devices (12), such as hand-held power tools and appliances. The system includes a cordless battery power module (14) that supplies the power and current demands of the device (12) in a cordless mode or a chopper module (21) that supplies the necessary power and current demands in a physical envelope commensurate in size and interchangeable with that of the battery power module (14). The chopper module (21) is provided with a non-filtered high efficiency converter circuit that allows the chopper module (21) to generate the power and current required by the driven device (12). The inductance of the motor (11) for the driven device (12) is used to filter the output of the chopper module (21). Eliminating the output filter from the chopper module (16) significantly reduces the cost and size of the module (16). Additionally, the need for multiple battery packs and fast rechargers is minimized by the availability of a low-cost converter.