Power tools

Details Power tools Power tools

2006-09-19

2006-09-19

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

Control of motor load or device driven

C173S093500, C173S128000, C173S217000

Reexamination Certificate

active

07109675

ABSTRACT:
Battery-powered tools may include battery1or battery pack BP and a drive source (e.g., motor M) for generating power using current supplied from the battery. A switch3may electrically connect the battery to the drive source. A voltage detector may detect the output battery voltage of the battery. Further, a processor60, 210, a comparator5or another similar device preferably determines when a difference between (1) a first battery voltage detected at a first predetermined time period after the switch is turned OFF and (2) a second battery voltage detected at a second predetermined time after the first predetermined time period exceeds a predetermined value. This information may be utilized to determine whether to warn an operator of the battery powered tool that further operation using the battery1or battery pack BP should be discontinued.

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