Power Tool Provided With Circuit Board

• US 20130000934A1
• Filed: 12/27/2011
• Published: 01/03/2013
• Est. Priority Date: 12/28/2010
• Status: Active Grant

• Current Assignee: Koki Holdings Co., Ltd.
• Original Assignee: Hitachi KOKI Company Limited (Koki Holdings Co., Ltd.)
• Inventors: Tadokoro, Naoki, Miyazawa, Ken, Kikuchi, Hajime, Koizumi, Toshiaki
• Granted Patent: US 9,457,459 B2
• Time in Patent Office: Days
• US Class Current: 173/20
• CPC Class Codes: B25B 21/00 Portable power-driven screw or nut setting or loosening tools; details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; for mounting or dismounting wheels B60B29/006; Attachments for drilling apparatus serving the same purpose machines B23P19/06
• CPC Class Codes: B25B 21/02 with means for imparting impact to screwdriver blade or nut socket
• CPC Class Codes: B25B 21/026 Impact clutches
• CPC Class Codes: B25F 5/00 Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
• CPC Class Codes: B25F 5/021 with guiding devices guiding devices for hand tools on stands or supports B25H1/0078

Abstract

A power tool includes a motor, an impact mechanism, an output unit, a circuit board, a housing, and a power cord. The circuit board includes a power-source circuit board configured to convert alternate current into direct current and a control circuit board. The housing includes a body section, a board accommodating section, and a handle section. The board accommodating section accommodates the circuit board. The handle section has one end portion connected to the body section and another end portion connected to the board accommodating section. The power cord extends from the board accommodating section. The power cord is positioned opposed to the handle section with respect to the board accommodating section. The control circuit board is located at a position close to the handle section in the board accommodating section. The power-source circuit board is located between the control circuit board and the power cord.

Claims

1. A power tool comprising:

a motor;

an impact mechanism driven by the motor;

an output unit connected to the impact mechanism;

a circuit board configured to control the motor and comprising a power-source circuit board configured to convert alternate current into direct current, and a control circuit board to which the direct current is supplied;

a housing comprising;

a body section accommodating the motor, the impact mechanism, and a part of the output unit;

a board accommodating section accommodating the circuit board; and

a handle section having one end portion connected to the body section and another end portion connected to the board accommodating section; and

a power cord extending from the board accommodating section and supplying the alternate current to the power-source circuit board, the power cord being positioned opposed to the handle section with respect to the board accommodating section,

wherein the control circuit board is located at a position close to the handle section in the board accommodating section, and the power-source circuit board is located between the control circuit board and the power cord.

2. The power tool as claimed in claim 1, wherein the control circuit board is provided with a microcomputer configured to control a rotational speed of the motor.

3. The power tool as claimed in claim 1, further comprising a switching element configured to control the direct current supplied to the motor,

wherein the motor is a brushless motor,

wherein the switching element, the motor, the impact mechanism, and the part of the output unit are arranged in this order in the body section.

4. The power tool as claimed in claim 1, wherein the one end portion of the handle section is provided with a trigger configured to switch supply and shutoff of the direct current supplied to the motor.

5. The power tool as claimed in claim 4, wherein the power-source circuit board is provided with a choke coil and a capacitor each configured to remove noises, the choke coil and the capacitor being disposed at the another end portion of the handle section.

6. The power tool as claimed in claim 5, wherein the handle extends in an extending direction from the body section to the board accommodating section, wherein the housing accommodates the motor, the trigger, the capacitor, the chock coil, the control circuit board, the power-source circuit board, and the power cord in this order in the extending direction.

7. The power tool as claimed in claim 5, wherein the housing accommodates the motor, the trigger, the capacitor, the chock coil, the control circuit board, the power-source circuit board, and the power cord such that a center gravity is located above the handle section.

8. The power tool as claimed in claim 5, wherein the capacitor is a film capacitor.

9. A power tool comprising:

a motor;

an impact mechanism driven by the motor;

an output unit connected to the impact mechanism;

a circuit board configured to control the motor, the circuit board comprising a power-source circuit board configured to convert alternate current into direct current and a control circuit board to which the direct current is supplied

a housing comprising;

a body section accommodating the motor, the impact mechanism, and a part of the output unit;

a board accommodating section accommodating the circuit board; and

a handle section having one end portion connected to the body section and another end portion connected to the board accommodating section; and

a power cord extending from the board accommodating section and supplying the alternate current to the power-source circuit board, the power cord being positioned opposed to the handle section with respect to the board accommodating section,

wherein the housing accommodates the motor, the control circuit board, the power-source circuit board, and the power cord in this order.

10. The power tool as claimed in claim 9, wherein the control circuit board is provided with a switching element.

11. The power tool as claimed in claim 9, wherein the power-source circuit board is provided with a switching element.

12. A power tool comprising:

a motor;

an impact mechanism driven by the motor;

an output unit connected to the impact mechanism and configured to drive an end bit mountable thereon;

a circuit board configured to control the motor;

a housing comprising;

a body section for supporting the output unit and extending in an axial direction of the end bit;

a handle section having one end portion connected to the body section and another end portion, the handle section extending in a direction across the axial direction; and

a board accommodating section accommodating the circuit board and connected to the another end portion of the handle section, the board accommodating section including a protruding section protruding in the axial direction and having a handle side outer surface;

a display panel configured to display a control state of the motor and located on the handle side outer surface; and

a power cord extending from the board accommodating section.

13. The power tool as claimed in claim 12, wherein the display panel includes a striking force switching button configured to switch a striking force of the impact mechanism.

14. The power tool as claimed in claim 12, wherein the display panel includes a mode switching button configured to switch an operating mode between a continuous mode in which the motor is operated continuously and a single mode in which the motor is operated for a predetermined period of time.

15. The power tool as claimed in claim 14, wherein the display panel further includes a mode display section configured to display the operating mode set by the mode switching button.

16. A power tool comprising:

a motor;

an impact mechanism driven by the motor;

an output unit connected to the impact mechanism;

a circuit board configured to control the motor;

a housing comprising;

a body section accommodating the motor, the impact mechanism, and a part of the output unit in this order in a first direction;

a handle section having one end portion connected to the body section and another end portion;

a board accommodating section accommodating the circuit board and connected to the another end portion of the handle section, the board accommodating section including a protruding section protruding in the first direction and having a handle side outer surface; and

a display panel configured to display a controls state of the motor and located on the handle side outer surface; and

a power cord extending from the board accommodating section.

17. A power tool comprising:

a housing;

a motor accommodated in the housing;

an impact mechanism driven by the motor;

an output unit connected to the impact mechanism and protruding from the housing;

a power cord connected to the housing;

a display panel configured to display a control state of the motor; and

a control unit configured to turn on the display panel while power source is supplied to the power cord.

18. The power tool as claimed in claim 17, wherein an end bit is detachably mounted on the output unit,

wherein the housing comprises:

a body section for supporting the output unit and extending in an axial direction of the end bit;

a handle section having one end portion connected to the body section and another end portion, the handle section extending in a direction across the axial direction; and

a board accommodating section connected to the another end portion and accommodating a circuit board configured to control the motor, the board accommodating section including a protruding section protruding in the axial direction and having a handle side outer surface provided with the display panel.