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WO1988006362A1 - Outil electrique a interrupteur de protection contre des courants de defaut - Google Patents

Outil electrique a interrupteur de protection contre des courants de defaut Download PDF

Info

Publication number
WO1988006362A1
WO1988006362A1 PCT/DE1988/000039 DE8800039W WO8806362A1 WO 1988006362 A1 WO1988006362 A1 WO 1988006362A1 DE 8800039 W DE8800039 W DE 8800039W WO 8806362 A1 WO8806362 A1 WO 8806362A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric tool
fault currents
switch against
protecting switch
operator
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.)
Ceased
Application number
PCT/DE1988/000039
Other languages
German (de)
English (en)
Inventor
Fritz Schädlich
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 WO1988006362A1 publication Critical patent/WO1988006362A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers

Definitions

  • the invention relates to a power tool according to the preamble of the main claim.
  • a common measure for the electrical insulation of hand power tools is protective insulation, e.g. through plastic housing as shown in DE-PS 21 52 585.
  • protective insulation e.g. through plastic housing as shown in DE-PS 21 52 585.
  • creeping gaps can form despite protective insulation, which transmit the mains voltage to metal housing parts.
  • the creepage distances occur when abrasive particles carried inside by the cooling air are deposited in the machine tool. As soon as such creepage distances create a conductive connection between live components inside and externally touchable metal parts, there is a risk to the operator.
  • the electric hand tool according to the invention with the characterizing features of the main claim has the advantage that, when leakage currents occur, a residual current circuit breaker disconnects the device from the mains and reliably prevents injury to the operator. description
  • a known residual current circuit breaker In a hand-held electrical machine tool with protective insulation, a known residual current circuit breaker is installed which, when a certain limit residual current of e.g. 30 milliamps disconnect the device from the mains.
  • the switch therefore detects a power loss that occurs over creepage distances, e.g. formed by grinding dust and prevents leakage currents from flowing over the operator. After thorough cleaning of the hand tool, it can be put back into operation.
  • the residual current circuit breaker is integrated in the power tool so that it is a unit with the device.
  • the switch and the associated electronics are advantageously encapsulated in a dust-free manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

Dans des outils électriques d'usinage de métaux, en particulier, des meuleuses, il peut se produire que le courant du réseau soit transmis, malgré l'isolement protecteur, à des parties métalliques du boîtier par des lignes de fuite formées par des particules meulées, mettant en danger l'opérateur. Cet outil électrique est pourvu d'un interrupteur de protection contre des courants de défaut, qui coupe l'appareil du réseau lors de l'apparition de courants de défaut, par exemple lorsque des courants sont déviés vers l'opérateur. Une protection du personnel est ainsi assurée.
PCT/DE1988/000039 1987-02-21 1988-01-28 Outil electrique a interrupteur de protection contre des courants de defaut Ceased WO1988006362A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3705580.1 1987-02-21
DE3705580 1987-02-21

Publications (1)

Publication Number Publication Date
WO1988006362A1 true WO1988006362A1 (fr) 1988-08-25

Family

ID=6321474

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1988/000039 Ceased WO1988006362A1 (fr) 1987-02-21 1988-01-28 Outil electrique a interrupteur de protection contre des courants de defaut

Country Status (1)

Country Link
WO (1) WO1988006362A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29714759U1 (de) 1997-08-18 1997-10-09 Heinrich Kopp Ag, 63796 Kahl Schaltung zur Erkennung eines geerdeten Metallteiles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3579037A (en) * 1968-11-12 1971-05-18 Oceanautic Mfg And Research Co Portable tool
FR2157663A5 (fr) * 1971-10-22 1973-06-01 Bosch
US3761774A (en) * 1970-03-20 1973-09-25 Black & Decker Mfg Co Ground fault protective apparatus
US4031431A (en) * 1975-10-01 1977-06-21 The Gillette Company Ground fault circuit interrupter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3579037A (en) * 1968-11-12 1971-05-18 Oceanautic Mfg And Research Co Portable tool
US3761774A (en) * 1970-03-20 1973-09-25 Black & Decker Mfg Co Ground fault protective apparatus
FR2157663A5 (fr) * 1971-10-22 1973-06-01 Bosch
US4031431A (en) * 1975-10-01 1977-06-21 The Gillette Company Ground fault circuit interrupter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29714759U1 (de) 1997-08-18 1997-10-09 Heinrich Kopp Ag, 63796 Kahl Schaltung zur Erkennung eines geerdeten Metallteiles

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