Electric tool

Patent metadata

Field	Value
Publication number	US-9871424-B2
Application number	US-201414763781-A
Country	US
Kind code	B2
Filing date	Jan 31, 2014
Priority date	Feb 6, 2013
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

In the present invention, a housing having a trunk part accommodating therein a brushless motor and an output part to which a tip tool is to be connected, a handle part having one end connected to the trunk part, and an accommodation part provided at an other end of the handle part is used, and a FET serving as a switching element that supplies power to the motor is accommodated in the accommodation part from which a power supply cord is pulled out. It is possible to reduce the length of the trunk part in the front-rear direction compared to a case where the FET is disposed in the front-rear direction of the motor.

First claim

The invention claimed is:

1. An electric tool comprising:
a motor;
an output part driven by the motor and to which a tip tool is to be connected, the output part being provided at a front side of the motor;
a housing having a trunk part accommodating therein the motor, a handle part extending downwardly from the trunk part and having one end connected to the trunk part and an accommodation part provided at an other end of the handle part, and
a power supply cord pulled out from the accommodation part,
wherein a switching element that supplies power to the motor is accommodated in the accommodation part,
wherein a ventilating window part serving as an intake hole is provided at a portion of the accommodation part, and
wherein the ventilating window part is provided at a front side of the accommodation part that protrudes more forwards than the other end of the handle part.

2. The electric tool according to claim 1 , wherein a control circuit board is accommodated in the accommodation part, a control circuit is mounted on one side of the control circuit board and the switching element is mounted on an other side of the control circuit board.

3. The electric tool according to claim 2 , wherein a push button is provided on the one side of the control circuit board together with the control circuit, and the push button is exposed from the accommodation part.

4. The electric tool according to claim 2 , wherein the control circuit and the switching element are electrically connected to each other by a wiring pattern of the control circuit board.

5. The electric tool according to claim 1 , wherein a rectification circuit board, on which a rectification circuit that converts alternating current power supplied from the power supply cord into direct current power is mounted, is accommodated in the accommodation part.

6. The electric tool according to claim 2 , wherein a rectification circuit board, on which a rectification circuit that converts alternating current power supplied from the power supply cord into direct current power is mounted, is accommodated in the accommodation part, a ventilating window part serving as an intake hole is provided at a portion of the accommodation part, and an air stream introduced from the ventilating window part passes through between the rectification circuit board and the control circuit board.

7. The electric tool according to claim 1 , wherein a coil and a capacitor configuring a noise filter are accommodated in the handle part, and an air stream introduced from the ventilating window part passes through the accommodation part, then passes a periphery of the coil and capacitor in the handle part and reaches the motor in the trunk part.

Assignees

• Hitachi Koki Kk

Inventors

• Tadokoro Naoki

Classifications

• H02K11/05 Primary

  Rectifiers associated with casings, enclosures or brackets · CPC title

• H02K9/02

  by ambient air flowing through the machine · CPC title

• H02K5/04

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title

• H02K11/044

  Electricity · mapped topic

• H02K7/145 Primary

  Hand-held machine tool · CPC title