Power tools
First Claim
Patent Images
1. A power tool comprising:
- a motor;
a power source cord connected to the motor and having a plug constructed to be electrically connected to an electrical outlet;
a phase control device constructed to perform a phase control of an AC power that is supplied to the motor via the power source cord, so that a rotational speed of the motor can be controlled;
a power supply device constructed to supply a power to the phase control device for the operation of the phase control device; and
a power source determining device constructed to determine if a power source supplied from the electrical outlet is an AC power source or a DC power source;
wherein;
when the power source determining device determines the power source to be a DC power source, the power source determining device outputs an OFF signal to the power supply device, so that no power is supplied from the power supply device to the phase control device; and
when the power source determining device determines the power source to be an AC power source, the power source determining device outputs an ON signal to the power supply device, so that the power is supplied from the power supply device to the phase control device;
the power source determining device is further configured to determine if the plug is connected to the electrical outlet; and
the determination as to whether the power source supplied from the electrical outlet is an AC power source or a DC power source is made when the connection of the plug to the electrical outlet is determined.
1 Assignment
0 Petitions
Accused Products
Abstract
A power tool includes a motor, a first device and a second device. The motor receives a supply of an electric power from a power source externally of the power tool. The first device determines if the electric power supplied from the power source is an AC power or a DC power. The second device permits or interrupts the supply of the electric power to the motor depending on the determination of the first device.
-
Citations
13 Claims
-
1. A power tool comprising:
-
a motor; a power source cord connected to the motor and having a plug constructed to be electrically connected to an electrical outlet; a phase control device constructed to perform a phase control of an AC power that is supplied to the motor via the power source cord, so that a rotational speed of the motor can be controlled; a power supply device constructed to supply a power to the phase control device for the operation of the phase control device; and a power source determining device constructed to determine if a power source supplied from the electrical outlet is an AC power source or a DC power source;
wherein;when the power source determining device determines the power source to be a DC power source, the power source determining device outputs an OFF signal to the power supply device, so that no power is supplied from the power supply device to the phase control device; and when the power source determining device determines the power source to be an AC power source, the power source determining device outputs an ON signal to the power supply device, so that the power is supplied from the power supply device to the phase control device; the power source determining device is further configured to determine if the plug is connected to the electrical outlet; and the determination as to whether the power source supplied from the electrical outlet is an AC power source or a DC power source is made when the connection of the plug to the electrical outlet is determined. - View Dependent Claims (2, 3)
-
-
4. A power tool comprising:
-
a motor constructed to receive a supply of an electric power from a power source externally of the power tool; a first device constructed to determine if the electric power supplied from the power source to the motor is an AC power or a DC power; and a second device constructed to interrupt the supply of the electric power to the motor depending on the determination of the first device; wherein the first device is further configured to determine if the power tool is connected to the power source. - View Dependent Claims (5, 6, 7, 8, 9)
-
-
10. A power tool comprising:
-
a motor; a power supply device constructed to supply a power to a phase control device for the operation of the phase control device; and a power source determining device constructed to determine if a power source supplied from the electrical outlet is an AC power source or a DC power source wherein, when the power source determining device determines the power source to be a DC power source, the power source determining device outputs an OFF signal to the power supply device, so that no power is supplied from the power supply device to the phase control device; and wherein the power source determining device is further configured to determine if the power is supplied from the electrical outlet; and wherein the determination if the power source supplied from the electrical outlet is an AC power source or a DC power source is made when the supply of power from the electrical outlet is determined. - View Dependent Claims (11, 12, 13)
-
Specification