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 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 and a power circuit that leads the driving current from the battery to the motor, wherein the control device stops the motor prior to an interruption of the power circuit when the battery is disengaged from the body.
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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.
27 Citations
19 Claims
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1. A power tool comprising:
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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 and a power circuit that leads the driving current from the battery to the motor, wherein the control device stops the motor prior to an interruption of the power circuit when the battery is disengaged from the body. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power tool comprising:
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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 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 prior to an interruption of the power circuit when the attaching of the battery to the body by means of the attaching device is released. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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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 and a battery detachably coupled to the body, the battery supplying a driving current to the motor, comprising a step of:
stopping the motor prior to an interruption of the supply of the driving current to the motor when the battery is disengaged from the body. - View Dependent Claims (15)
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16. A power tool comprising:
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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 control means stops the motor prior to an interruption of the power circuit when the battery is disengaged from the body.
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17. A power tool comprising:
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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 control means stops the motor prior to an interruption of the power circuit when the attaching of the battery to the body by the attaching means is released.
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18. A power tool comprising:
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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 prior to an interruption of the power circuit when the engagement between the battery and the body by means of the engagement device is released.
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19. A power tool comprising:
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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 the second connecting terminal is disconnected so as to stop the motor before the first connecting terminal is disconnected when the battery is disengaged from the body.
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Specification