EP2886262A3 - Electric power tool and a restart prevention system therefor - Google Patents

Electric power tool and a restart prevention system therefor Download PDF

Info

Publication number
EP2886262A3
EP2886262A3 EP14183269.1A EP14183269A EP2886262A3 EP 2886262 A3 EP2886262 A3 EP 2886262A3 EP 14183269 A EP14183269 A EP 14183269A EP 2886262 A3 EP2886262 A3 EP 2886262A3
Authority
EP
European Patent Office
Prior art keywords
switch
drive
opto
coupler
supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14183269.1A
Other languages
German (de)
French (fr)
Other versions
EP2886262A2 (en
Inventor
Jeroen Schroer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2886262A2 publication Critical patent/EP2886262A2/en
Publication of EP2886262A3 publication Critical patent/EP2886262A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Portable Power Tools In General (AREA)

Abstract

The present invention relates to an electric power tool, in particular a grinder. The invention comprises a mains connector to be selectively connected to a power supply by a user, a hardware switch, which is operable by a user and an electric drive, in particular an electric motor, wherein the switch is arranged in a connection between the connector and the drive to selectively allow supply of power to the drive with the connector connected to the supply, a restart prevention system, comprising at least one opto-coupler, CHARACTERISED IN THAT the restart prevention system is configured to prevent restart of the drive after temporary disconnection from or interruption of power supply with the switch in a state to supply power to the drive, wherein the opto-coupler is connected to conductors of the connection and there arranged in series with a normally conducting switch part of the switch, which is opened to a non-conductive state in conjunction with user operation of the switch to activate the drive, and the opto-coupler is arranged in a by-pass excluding the switch part of the switch, when the switch part of the switch is in said non-conductive state, to maintain current flow through the opto-coupler while connected via the connection to the power supply. Furthermore the invention relates to a system configured to prevent restart of an electric power tool.
EP14183269.1A 2013-10-29 2014-09-02 Electric power tool and a restart prevention system therefor Withdrawn EP2886262A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2011696A NL2011696C2 (en) 2013-10-29 2013-10-29 Electric power tool and a restart prevention system therefor.

Publications (2)

Publication Number Publication Date
EP2886262A2 EP2886262A2 (en) 2015-06-24
EP2886262A3 true EP2886262A3 (en) 2015-08-12

Family

ID=49817229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14183269.1A Withdrawn EP2886262A3 (en) 2013-10-29 2014-09-02 Electric power tool and a restart prevention system therefor

Country Status (3)

Country Link
EP (1) EP2886262A3 (en)
NL (1) NL2011696C2 (en)
RU (1) RU2014139650A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3330046B1 (en) * 2015-07-31 2021-04-21 Koki Holdings Co., Ltd. Power tool
US10833503B2 (en) * 2017-08-11 2020-11-10 Black & Decker Inc. Hardware control for prevention of dangerous restart in a power tool

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307325A (en) * 1980-01-28 1981-12-22 Black & Decker Inc. Digital control system for electric motors in power tools and the like
JPH10127073A (en) * 1996-10-17 1998-05-15 Hitachi Koki Co Ltd Soft starter
US6087815A (en) * 1997-04-23 2000-07-11 Fiskars Inc. Portable power system using DC to DC converter
US20090160371A1 (en) * 2007-12-25 2009-06-25 Panasonic Electric Works Co., Ltd. Electric power tool
US20090207035A1 (en) * 2008-02-15 2009-08-20 Makita Corporation Electrical power tools
US20110148332A1 (en) * 2009-01-19 2011-06-23 Hitachi Koki Co., Ltd. Power tool
DE102011013884A1 (en) * 2011-03-04 2012-09-06 C. & E. Fein Gmbh control unit
US20120306291A1 (en) * 2009-10-28 2012-12-06 Bernd Wirnitzer Electric machine tool comprising a starting inhibitor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307325A (en) * 1980-01-28 1981-12-22 Black & Decker Inc. Digital control system for electric motors in power tools and the like
JPH10127073A (en) * 1996-10-17 1998-05-15 Hitachi Koki Co Ltd Soft starter
US6087815A (en) * 1997-04-23 2000-07-11 Fiskars Inc. Portable power system using DC to DC converter
US20090160371A1 (en) * 2007-12-25 2009-06-25 Panasonic Electric Works Co., Ltd. Electric power tool
US20090207035A1 (en) * 2008-02-15 2009-08-20 Makita Corporation Electrical power tools
US20110148332A1 (en) * 2009-01-19 2011-06-23 Hitachi Koki Co., Ltd. Power tool
US20120306291A1 (en) * 2009-10-28 2012-12-06 Bernd Wirnitzer Electric machine tool comprising a starting inhibitor
DE102011013884A1 (en) * 2011-03-04 2012-09-06 C. & E. Fein Gmbh control unit

Also Published As

Publication number Publication date
NL2011696C2 (en) 2015-04-30
RU2014139650A (en) 2016-04-20
EP2886262A2 (en) 2015-06-24

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