Electricity: motive power systems – Battery-fed motor systems
Reexamination Certificate
2006-05-30
2006-05-30
Martin, David (Department: 2837)
Electricity: motive power systems
Battery-fed motor systems
C318S432000, C318S434000, C173S178000, C173S181000, C173S217000
Reexamination Certificate
active
07053567
ABSTRACT:
It is an object of the invention to provide a technique to effectively prevent a power tool from being adversely affected when a battery is removed from the power tool. According to the present invention, a power tool is provided that includes a tool bit, a motor that drives the tool bit, a body that houses the motor, a battery detachably coupled to the body so as to supply driving current to operate the motor, a control device that controls the operation of the motor and a power circuit that leads the driving current from the battery to the motor. Within the power tool, the control device stops the motor prior to an interruption of the power circuit when the battery is disengaged from the body in order to prevent a large driving current from being passed through the power circuit. As a result, arc can be effectively prevented from being generated between the battery and the body of the power tool.
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Makita Corporation
Orrick Herrington & Sutcliffe LLP
Smith Tyrone
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