Electric tool

Patent metadata

Field	Value
Publication number	US-2016204718-A1
Application number	US-201414893124-A
Country	US
Kind code	A1
Filing date	Aug 26, 2014
Priority date	Sep 28, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

An electric tool includes a brushless motor and an output part, which is driven by the brushless motor and to which a tip tool is mounted, and a tumbler switch. The tumbler switch applies, to the control unit, a stop signal for stopping the brushless motor at a neutral position, a forward rotation signal for forward rotating the brushless motor by an operation in a first direction, and a reverse rotation signal for reversely rotating the brushless motor by an operation in a second direction.

First claim

1 . An electric tool comprising:
a brushless motor; an output part, which is driven by the brushless motor, and to which a tip tool is mounted; a control unit configured to control a rotation direction and a rotating speed of the brushless motor; and a switch configured to start driving of the brushless motor, wherein the switch is configured to:
apply, to the control unit, a stop signal for stopping the brushless motor in a case where the switch is at a neutral position;
apply, to the control unit, a forward rotation signal for forward rotating the brushless motor in a case where the switch is operated in a first direction; and
apply, to the control unit, a reverse rotation signal for reversely rotating the brushless motor in a case where the switch is operated in a second direction.

2 . The electric tool according to claim 1 , wherein when a signal for rotating the brushless motor in an opposite direction to a previous rotation direction is applied to the control unit through an operation of the switch, the control unit is configured to start up the brushless motor in a soft start manner after the brushless motor is stopped.

3 . The electric tool according to claim 1 , wherein when a signal for rotating the brushless motor in an opposite direction to a previous rotation direction is applied to the control unit through an operation of the switch, the control unit is configured to start up the brushless motor in a slow soft start manner that is slower than a soft start manner if the brushless motor is being rotated.

4 . The electric tool according to claim 1 , wherein the switch is configured by a tumbler switch.

5 . An electric tool comprising:
a brushless motor, to which power is fed from a power supply; an output part, which is driven by the brushless motor, and to which a tip tool is mounted; a control unit configured to control a rotation direction and a rotating speed of the brushless motor; and a switch configured to:
stop the brushless motor in a case where the switch is at a neutral position;
forward rotate the brushless motor in a case where the switch is operated in a first direction; and
reversely rotate the brushless motor in a case where the switch is operated in a second direction,
wherein the switch is provided outside a current path between the power supply and the brushless motor.

6 . The electric tool according to claim 5 , wherein the switch is configured to apply a rotation direction signal of the brushless motor to the control unit.

Assignees

• Hitachi Koki Kk

Inventors

• Koizumi Toshiaki
• Tadokoro Naoki
• Iwata Kazutaka
• Nakayama Eiji

Classifications

• H02P3/06

  for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter · CPC title

• H01H23/30

  with stable centre positions and one or both end positions unstable · CPC title

• B25B21/02

  with means for imparting impact to screwdriver blade or nut socket · CPC title

• H02P1/22 Primary

  in either direction of rotation · CPC title

• H01H9/06

  Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner · CPC title