Power tools
First Claim
1. A power tool comprising:
- a tool bit;
a motor that drives the tool bit;
a body that houses the motor;
a battery having power terminals detachably coupled to the body, wherein the battery supplies driving current to operate the motor;
a power circuit that leads the driving current from the battery to the motor; and
a control device that stops the motor after an engagement device on the battery begins physical disengagement from the body, but prior to the power terminals detaching completely from the body, thereby preventing an arc from being generated between the power terminals on the battery and the body.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
19 Claims
-
1. A power tool comprising:
-
a tool bit; a motor that drives the tool bit; a body that houses the motor; a battery having power terminals detachably coupled to the body, wherein the battery supplies driving current to operate the motor; a power circuit that leads the driving current from the battery to the motor; and a control device that stops the motor after an engagement device on the battery begins physical disengagement from the body, but prior to the power terminals detaching completely from the body, thereby preventing an arc from being generated between the power terminals on the battery and the body. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A power tool comprising:
-
a tool bit; a motor that drives the tool bit; a body that houses the motor; a battery detachably coupled to the body, wherein the battery supplies driving current to operate the motor; an attaching device that attaches the battery to the body; a power circuit that leads the driving current from the battery to the motor; and a control device that controls the operation of the motor, wherein the control device stops the motor after the attaching device starts to be physically released from the body, but prior to the battery terminals detaching completely from the body, thereby preventing an arc from being generated between the battery terminals and the body. - View Dependent Claims (8, 9, 10, 11, 12, 13)
-
-
14. A method of using a power tool, wherein the power tool having a tool bit, a motor that drives the tool bit, a body that houses the motor, an engagement device and a battery detachably coupled to the body, the battery supplying a driving current to the motor, comprising:
stopping the motor after the engagement device physically disengages from the body but prior to the battery terminals detaching completely from the body, thereby preventing an arc from being generated between the battery terminals and the body. - View Dependent Claims (15)
-
16. A power tool comprising:
-
a tool bit, a motor that drives the tool bit, a body that houses the motor, a battery detachably coupled to the body, wherein the battery supplies driving current to operate the motor, a power circuit that leads the driving current from the battery to the motor and means for controlling the operation of the motor, wherein the means for controlling stops the motor after an engagement device begins to physically disengage from the body but prior to the battery terminals detaching completely from the body, thereby preventing an arc from being generated between the battery terminals and the body.
-
-
17. A power tool comprising:
-
a tool bit, a motor that drives the tool bit, a body that houses the motor, a battery detachably coupled to the body, wherein the battery supplies driving current to operate the motor, means for attaching the battery to the body, means for controlling the operation of the motor and a power circuit that leads the driving current from the battery to the motor, wherein the means for controlling stops the motor after an engagement device begins to physically disengage from the body but prior to the battery terminals detaching completely from the body, thereby preventing an arc from being generated between the battery terminals and the body.
-
-
18. A power tool comprising:
-
a tool bit, a motor that drives the tool bit, a body that houses the motor, a battery that supplies driving current to operate the motor, an engagement device that detachably locks the battery to the body, 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, wherein the control device stops the motor after the engagement device begins to physically disengage from the body but prior to the battery terminals detaching completely from the body, thereby preventing an arc from being generated between the battery terminals and the body.
-
-
19. A power tool comprising:
-
a tool bit, a motor that drives the tool bit, a body that houses the motor, a battery detachably coupled to the body, wherein the battery supplies driving current to operate the motor, a control device that controls the operation of the motor, a power circuit that leads the driving current from the battery to the motor and a first connecting terminal and a second connecting terminal, the both terminals being provided between the battery and the body, the first connecting terminal forming the power circuit and the second connecting terminal being adapted to turn on and off in response to the mounted state of the battery, wherein the length of the second connecting terminal is shorter than the length of the first connecting terminal and wherein the motor stops when the second connecting terminal begins to physically disengage from the body but prior to the first battery terminal detaching completely from the body, thereby preventing an arc from being generated between the first battery terminal and the body.
-
Specification