EP0150669A2 - Outil manuel avec masse d'inertie mobile - Google Patents

Outil manuel avec masse d'inertie mobile Download PDF

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Publication number
EP0150669A2
EP0150669A2 EP84810594A EP84810594A EP0150669A2 EP 0150669 A2 EP0150669 A2 EP 0150669A2 EP 84810594 A EP84810594 A EP 84810594A EP 84810594 A EP84810594 A EP 84810594A EP 0150669 A2 EP0150669 A2 EP 0150669A2
Authority
EP
European Patent Office
Prior art keywords
mass
container
magnetic field
liquid
permanent magnet
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.)
Granted
Application number
EP84810594A
Other languages
German (de)
English (en)
Other versions
EP0150669B1 (fr
EP0150669A3 (en
Inventor
Heinz Dr.-Phys. Kousek
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP0150669A2 publication Critical patent/EP0150669A2/fr
Publication of EP0150669A3 publication Critical patent/EP0150669A3/de
Application granted granted Critical
Publication of EP0150669B1 publication Critical patent/EP0150669B1/fr
Expired legal-status Critical Current

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/13—Cutting by use of rotating axially moving tool with randomly-actuated stopping means
    • Y10T408/14—Responsive to condition of Tool or tool-drive

Definitions

  • the invention relates to a motor-operated hand-held device which gives a tool a rotary movement, with a housing and a mass movably mounted therein in a plane running perpendicular to the tool axis.
  • the reaction moment occurring on the tool must be applied by the operator. This is easily manageable in normal operation. For example, when drilling in inhomogeneous material, the drill can suddenly jam and even become blocked. This leads to a rapid increase in the reaction torque, for which the operator is generally not prepared. Under unfavorable conditions, this can lead to injuries to the operator. When working on scaffolding or ladders the danger of a direct-g also is ewichtswes, resulting in a further hazard.
  • a mass is mounted so as to be movable relative to the housing in a plane that is essentially perpendicular to the tool axis.
  • the mass is displaced relative to the housing due to its inertia and actuates a switch.
  • the pulse emitted by the switch when it is actuated can be used, for example, to interrupt the energy supply to the drive motor, for Actuation of a disconnect clutch or a brake can be used.
  • the invention has for its object to provide a simple device for a handheld device that enables a rapid and independent of external influences such as temperature, pollution or the like to detect undesirable torques suddenly acting on the device.
  • the mass is an electrically conductive liquid arranged in a closed, electrically non-conductive container and Means are provided for tapping off the induction which arises during a relative movement of the mass in a magnetic field.
  • the mass By designing the mass as a liquid according to the invention, the mechanical friction, which is dependent on various factors such as lubrication state, temperature and the like, is replaced by the substantially lower liquid friction.
  • the liquid is hermetically sealed in the container.
  • the hand-held device When the hand-held device is suddenly turned around its tool axis, the liquid mass rotates about its own axis due to its inertia relative to the housing.
  • This relative movement of the mass relative to the housing can be determined from the outside as an electrical signal according to the laws of "electromagnetism or the relationship between the current-carrying conductor and the magnetic field.
  • the mass In order to obtain a signal that can be used for further processing, it is expedient for the mass to be at least partially penetrated by the magnetic field.
  • a voltage is induced in the area of the mass penetrated by the magnetic field, which voltage can be measured and used as a signal.
  • a voltage can be applied to the electrically conductive, liquid mass. If this mass moves as a current-carrying conductor through the magnetic field, a field change occurs, which in turn can be measured and used as a signal.
  • electrical coils can be used to generate the magnetic field.
  • these coils mean a loss of energy and also have the disadvantage that they heat up over time during operation. It is therefore advantageous to provide a permanent magnet for generating the magnetic field.
  • a permanent magnet takes up little space and constantly generates a constant magnetic field.
  • the magnetic field can be introduced to the mass via yokes connected to the magnet.
  • Electrodes must be created to measure or apply a voltage to the liquid mass. It is therefore expedient to design the means for tapping the induction as electrodes which are in electrical connection with the liquid. Materials with good electrical conductivity, such as copper, silver or gold, can be used for the electrodes.
  • the electrodes protrude through the wall of the container. However, since there is no relative movement between the electrodes and the container, the passage of the electrodes through the container wall can be sealed without any problems.
  • the mass can move relative to the field by tapping the voltage induced in the mass.
  • the currents that occur are very small and therefore have to be electrically amplified.
  • Another expedient possibility is to arrange the means for tapping the induction on an induction element.
  • This induction element can be an additional coil, for example. If the poles of this second coil are arranged offset to those of a first coil analogous to the construction of an AC meter, a voltage is induced in the second coil when the mass moves relative.
  • a semiconductor component in particular a so-called “Hall element”, can also be used as an induction element for tapping off the induction.
  • various substances can be used as the liquid for the mass, provided that they are conductive.
  • concentrated salt solutions or the like can also be used.
  • a certain minimum weight of the mass is advantageous for the safe functioning of the device.
  • the liquid is mercury.
  • Mercury has a very high density and therefore gives a high moment of inertia.
  • the electrical conductivity of mercury is good and it can no disruptive galvanic potentials arise.
  • the liquid state of matter extends over a wide temperature range and the viscosity is very low. Because of the high surface tension of the mercury, the container, which is preferably made of plastic, is not wetted. Any air bubble in the container would therefore remain stationary and would not be a problem.
  • the drill shown in FIG. 1 has a housing 1 and an associated, laterally projecting handle 2.
  • a switch 3 and a feed line 4 are arranged on the handle 2.
  • a drilling spindle 5 protrudes from the housing 1.
  • the drilling spindle 5 is provided with a chuck 6 for receiving the drilling tools.
  • a container 7 is arranged in the rear area of the housing 1 adjacent to the handle 2.
  • the container 7 is hermetically sealed and, as can be seen in particular from FIG. 2, contains a liquid serving as mass 8.
  • the mass 8 is electrically conductive and should have the highest possible density.
  • Mercury is preferably used for the mass 8.
  • Mercury also has a high surface tension and therefore does not wet the wall of the container 7. Instead of mercury, concentrated salt solutions can also be used.
  • the container 7 is fixedly connected to the housing 1.
  • a permanent magnet 9 is arranged outside the container 7.
  • the permanent magnet 9 is on both sides with a protruding into the area of the container 7 Provide yoke 10.
  • the liquid mass 8 arranged in the container 7 is thus partially penetrated by a magnetic field generated by the permanent magnet 9.
  • electrodes 10, 11 each protrude into the container 7.
  • the electrodes 10, 11 are in electrical connection with the mass 8.
  • the magnet 9 with the two yokes 10 is also fixedly connected to the housing 1.
  • the container 7 is preferably designed as a round box, the axis of which runs parallel to the drilling spindle 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Fluid-Damping Devices (AREA)
  • Earth Drilling (AREA)
EP84810594A 1983-12-21 1984-12-05 Outil manuel avec masse d'inertie mobile Expired EP0150669B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833346215 DE3346215A1 (de) 1983-12-21 1983-12-21 Handwerkzeug mit beweglich gelagerter traegheitsmasse
DE3346215 1983-12-21

Publications (3)

Publication Number Publication Date
EP0150669A2 true EP0150669A2 (fr) 1985-08-07
EP0150669A3 EP0150669A3 (en) 1987-01-07
EP0150669B1 EP0150669B1 (fr) 1989-02-15

Family

ID=6217586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84810594A Expired EP0150669B1 (fr) 1983-12-21 1984-12-05 Outil manuel avec masse d'inertie mobile

Country Status (3)

Country Link
US (1) US4638870A (fr)
EP (1) EP0150669B1 (fr)
DE (2) DE3346215A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006508A3 (fr) * 1987-03-05 1988-09-22 Bosch Gmbh Robert Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main
EP0326783A3 (en) * 1988-01-30 1990-10-10 Hilti Aktiengesellschaft Motor-driven hand tool
EP0345655A3 (fr) * 1988-06-04 1992-03-04 Robert Bosch Gmbh Circuit de sécurité pour outil électrique portable
WO1992018291A1 (fr) * 1991-04-12 1992-10-29 Robert Bosch Gmbh Machine a main avec capteur de blocage
DE4344817A1 (de) * 1993-12-28 1995-06-29 Hilti Ag Verfahren und Einrichtung für handgeführte Werkzeugmaschinen zur Vermeidung von Unfällen durch Werkzeugblockieren
EP0759343A1 (fr) * 1995-08-17 1997-02-26 Milwaukee Electric Tool Corporation Outil à main entraîné par moteur à commutateur à inertie
DE19857061A1 (de) * 1998-12-10 2000-06-15 Hilti Ag Verfahren und Einrichtung zur Vermeidung von Unfällen bei handgeführten Werkzeugmaschinen durch Werkzeugblockieren
DE10303006A1 (de) * 2003-01-27 2004-08-05 Hilti Ag Handgeführtes Arbeitsgerät

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3707052A1 (de) * 1987-03-05 1988-09-15 Bosch Gmbh Robert Verfahren zum unterbrechen der antriebstaetigkeit, insbesondere drehantriebstaetigkeit, einer handwerkzeugmaschine
US5264783A (en) * 1992-01-21 1993-11-23 Allegro Microsystems, Inc. Contactless magnet-activated proportional controller
DE4426305C2 (de) * 1994-07-25 1997-03-06 Hilti Ag Adaptive Rutschkupplung
DE19540718B4 (de) * 1995-11-02 2007-04-05 Robert Bosch Gmbh Handwerkzeugmaschine mit einer von einer Detektionseinrichtung auslösbaren Blockiereinrichtung
US7395871B2 (en) * 2003-04-24 2008-07-08 Black & Decker Inc. Method for detecting a bit jam condition using a freely rotatable inertial mass
US7552781B2 (en) 2004-10-20 2009-06-30 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
US7410006B2 (en) * 2004-10-20 2008-08-12 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
US8316958B2 (en) * 2006-07-13 2012-11-27 Black & Decker Inc. Control scheme for detecting and preventing torque conditions in a power tool
US20080021590A1 (en) * 2006-07-21 2008-01-24 Vanko John C Adaptive control scheme for detecting and preventing torque conditions in a power tool
US20090065225A1 (en) * 2007-09-07 2009-03-12 Black & Decker Inc. Switchable anti-lock control
DE102009046789A1 (de) * 2009-11-17 2011-05-19 Robert Bosch Gmbh Handwerkzeugmaschinenvorrichtung
CN102753782B (zh) 2010-01-07 2015-09-30 布莱克和戴克公司 具有旋转输入控制的电动螺丝起子
US9266178B2 (en) 2010-01-07 2016-02-23 Black & Decker Inc. Power tool having rotary input control
US8418778B2 (en) 2010-01-07 2013-04-16 Black & Decker Inc. Power screwdriver having rotary input control
US9475180B2 (en) 2010-01-07 2016-10-25 Black & Decker Inc. Power tool having rotary input control
DE202011110069U1 (de) * 2011-12-21 2013-02-08 Robert Bosch Gmbh Handwerkzeugmaschine
EP2631035B1 (fr) 2012-02-24 2019-10-16 Black & Decker Inc. Outil électrique
CN102825569B (zh) * 2012-08-22 2015-02-25 南京德朔实业有限公司 压力触发工作的电动工具
US20160023336A1 (en) * 2014-07-24 2016-01-28 Taizhou Dajiang Ind. Co., Ltd. Phase transition heat storage device
US9777725B2 (en) * 2014-07-24 2017-10-03 Taizhou Dajiang Ind. Co., Ltd. High pressure water pump
US10589413B2 (en) 2016-06-20 2020-03-17 Black & Decker Inc. Power tool with anti-kickback control system
US11529725B2 (en) 2017-10-20 2022-12-20 Milwaukee Electric Tool Corporation Power tool including electromagnetic clutch
WO2019084280A1 (fr) 2017-10-26 2019-05-02 Milwaukee Electric Tool Corporation Procédés de commande du recul pour outils électriques
WO2019177776A1 (fr) 2018-03-16 2019-09-19 Milwaukee Electric Tool Corporation Dispositif de filetage de tuyau
US11641102B2 (en) 2020-03-10 2023-05-02 Smart Wires Inc. Modular FACTS devices with external fault current protection within the same impedance injection module

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL14349C (fr) * 1923-09-26
US1894634A (en) * 1931-03-09 1933-01-17 American Car & Foundry Co Portable electric tool
US2753469A (en) * 1954-06-01 1956-07-03 Statham Lab Inc Accelerometers
US3482196A (en) * 1967-09-28 1969-12-02 Dresser Ind Mercury switch controller
NL146984B (nl) * 1971-08-10 1975-08-15 Ir Ferdinand Hubert Franciscus Hall-spanningsinrichting voor het bepalen van eigenschappen van geladen deeltjes.
US4063600A (en) * 1976-05-05 1977-12-20 Krzes Casey S Power tool safety mechanism
JPS54136529U (fr) * 1978-03-15 1979-09-21
US4319236A (en) * 1980-08-07 1982-03-09 Barber-Colman Company Hall effect position detector
DE3041099A1 (de) * 1980-10-31 1982-06-09 Hilti AG, 9494 Schaan Motorisch betriebenes handwerkzeug zum bohren

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006508A3 (fr) * 1987-03-05 1988-09-22 Bosch Gmbh Robert Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main
EP0326783A3 (en) * 1988-01-30 1990-10-10 Hilti Aktiengesellschaft Motor-driven hand tool
EP0345655A3 (fr) * 1988-06-04 1992-03-04 Robert Bosch Gmbh Circuit de sécurité pour outil électrique portable
WO1992018291A1 (fr) * 1991-04-12 1992-10-29 Robert Bosch Gmbh Machine a main avec capteur de blocage
US5401124A (en) * 1991-04-12 1995-03-28 Robert Bosch Gmbh Hand-held power tool with jamming-detection sensor
DE4344817A1 (de) * 1993-12-28 1995-06-29 Hilti Ag Verfahren und Einrichtung für handgeführte Werkzeugmaschinen zur Vermeidung von Unfällen durch Werkzeugblockieren
EP0666148A1 (fr) 1993-12-28 1995-08-09 HILTI Aktiengesellschaft Procédé et dispositif pour machines portatives pour éviter des accidents causés par un blocage d'outil
EP0759343A1 (fr) * 1995-08-17 1997-02-26 Milwaukee Electric Tool Corporation Outil à main entraîné par moteur à commutateur à inertie
US5704435A (en) * 1995-08-17 1998-01-06 Milwaukee Electric Tool Corporation Hand held power tool including inertia switch
US5984020A (en) * 1995-08-17 1999-11-16 Milwaukee Electric Tool Corporation Power toll including inertia responsive element
DE19857061A1 (de) * 1998-12-10 2000-06-15 Hilti Ag Verfahren und Einrichtung zur Vermeidung von Unfällen bei handgeführten Werkzeugmaschinen durch Werkzeugblockieren
DE19857061C2 (de) * 1998-12-10 2000-11-02 Hilti Ag Verfahren und Einrichtung zur Vermeidung von Unfällen bei handgeführten Werkzeugmaschinen durch Werkzeugblockieren
DE10303006A1 (de) * 2003-01-27 2004-08-05 Hilti Ag Handgeführtes Arbeitsgerät
US7036703B2 (en) 2003-01-27 2006-05-02 Hilti Aktiengesellschaft Hand-held working tool
CN1326668C (zh) * 2003-01-27 2007-07-18 希尔蒂股份公司 手工操作的工具
DE10303006B4 (de) 2003-01-27 2019-01-03 Hilti Aktiengesellschaft Handgeführtes Arbeitsgerät

Also Published As

Publication number Publication date
DE3346215A1 (de) 1985-07-11
EP0150669B1 (fr) 1989-02-15
US4638870A (en) 1987-01-27
EP0150669A3 (en) 1987-01-07
DE3476743D1 (en) 1989-03-23

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