EP0199883A2 - Outil manuel à moteur - Google Patents

Outil manuel à moteur Download PDF

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Publication number
EP0199883A2
EP0199883A2 EP85810591A EP85810591A EP0199883A2 EP 0199883 A2 EP0199883 A2 EP 0199883A2 EP 85810591 A EP85810591 A EP 85810591A EP 85810591 A EP85810591 A EP 85810591A EP 0199883 A2 EP0199883 A2 EP 0199883A2
Authority
EP
European Patent Office
Prior art keywords
motor
housing
hand tool
bearing block
force measuring
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
EP85810591A
Other languages
German (de)
English (en)
Other versions
EP0199883A3 (en
EP0199883B1 (fr
Inventor
Werner Klingenbeck
Anton Neumaier
Hans-Jürgen Hoereth
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 EP0199883A2 publication Critical patent/EP0199883A2/fr
Publication of EP0199883A3 publication Critical patent/EP0199883A3/de
Application granted granted Critical
Publication of EP0199883B1 publication Critical patent/EP0199883B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • 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

Definitions

  • the invention relates to a motor-operated hand tool with a housing, a motor arranged therein, a drive shaft set in rotation by the motor and a transmission arranged between the motor and the drive shaft.
  • Motor-operated hand tools are used for various purposes, such as drilling, grinding, sawing, milling and the like.
  • the reaction moment that occurs must be applied by the operator. Under normal circumstances this is easily possible. In special situations, such as when the tool suddenly jams or jams, this reaction moment can increase very quickly and very strongly. If the operator is not prepared for this, this can lead to accidents with more or less serious consequences.
  • Another known solution is to provide weakening points on the housing or on the handle of the hand tool, the deformation of which is measured, for example, by means of a strain gauge. It is therefore not the torque that is measured, but rather the resulting deformation of the housing or the handle. The results of such measurements can be falsified, for example, by the operator holding and guiding the hand tool not only by the handles, but by the housing. This method also does not enable the forces and moments that occur to be precisely determined.
  • the motor is movably mounted in the housing and is supported in the housing by at least one support bearing that receives the reaction torque of the electric motor.
  • the support bearing contains a pressure sensor made of electrically conductive plastic material, the electrical resistance of which changes depending on the pressure exerted.
  • the reaction torque occurring at the motor is measured with this solution. Since the required power is mainly achieved in hand tools for weight reasons due to a very high motor speed, the torque that occurs on the motor shaft is usually very small. This means that the reaction forces that occur on the motor are also relatively low. As a result of friction, inertia of the masses to be accelerated and the like, such disturbing influences occur that the reaction torque that actually occurs on the tool cannot be determined exactly at this point.
  • the invention has for its object to detect the reaction torque occurring on the tool accurately and without a time delay in a hand tool.
  • this object is achieved in that at least one gear shaft is mounted in a bearing block which is limitedly movable in the housing and is supported on the housing via electrical force measuring elements in the direction of the reaction forces which occur due to the torque transmission.
  • this transmission shaft is located in the "drive chain" of the transmission to the work spindle, the more precisely and quickly the torque occurring on the work spindle can be detected. In principle, it is sufficient to provide a single force measuring element. However, if the hand tool has a possibility of reversing the direction of rotation, two force measuring elements are preferably to be provided, which can be arranged, for example, in pairs opposite one another.
  • the bearing block is expediently rotatably mounted about a pivot axis running parallel to the gear shaft. Due to a pivot axis running parallel to the gear shaft, skewing of the gear shaft when moving it is practically avoided.
  • the gear shaft mounted in the bearing block is at least in engagement with another shaft via toothings.
  • the pivot axis of the bearing block advantageously runs coaxially with the axis of rotation of a gearwheel which is in engagement with the gear shaft.
  • the movement of the pedestal thus corresponds in principle to that of the web of a planetary gear
  • the effective displacement or swivel path in the area of the force measuring elements can be very small and usually only be a few tenths of a millimeter.
  • the force measuring elements are expediently made of piezoceramic for an accurate detection of the forces occurring.
  • an electrical charge is created when deformed by external force. This charge is proportional to the deformation or the force that occurs and can be converted into a voltage by suitable amplifiers.
  • the deformation path of such elements is a few ⁇ m.
  • the signal of the force measuring elements can be evaluated differently depending on the demands placed on the ease of use of the hand tool. For example, it is sufficient for certain applications to emit an optical or acoustic signal when a certain value is exceeded.
  • the signal from the force measuring elements is preferably used to generate control functions of the hand tool. In this case, for example, a clutch interrupting the torque transmission or a brake converting the still existing rotational energy of the transmission shafts into heat can be actuated.
  • the hand tool shown in FIGS. 1 and 2 has a housing, generally designated 1, to which a handle 2 is detachably connected.
  • the handle 2 has a push button 3 for switching the hand tool on and off and a feed line 4 for the electrical power supply of the hand tool.
  • a motor generally designated 5
  • a motor pinion 5a meshes with a gear 6.
  • the gearwheel 6 is firmly connected to a crankshaft, denoted overall by 7.
  • the crankshaft 7 is mounted on the one hand in a radial bearing 8 and on the other hand in a bearing plate 5b of the motor 5.
  • the radial bearing 8 is arranged in a bearing block, designated overall by 9, which is pivotably mounted in a bore la of the housing by means of an extension 9a.
  • the crankshaft 7 is provided with a toothing 7a which is in engagement with a spur gear 10.
  • the spur gear 10 is fixedly connected to a pinion shaft, designated overall by 11.
  • the pinion shaft 11 is also supported in the bearing block 9 via an angular contact ball bearing 12. Since the bearing block 9 is pivotally mounted about the axis of the crankshaft 7, the spur gear 10 and the toothing 7a remain unchanged in engagement with any pivoting movement of the bearing block 9.
  • the pinion shaft 11 carries a bevel pinion 11a which is in engagement with a bevel gear 13.
  • the bevel gear 13 is non-rotatably connected to a cylinder 14 and secured against axial displacement by means of a locking ring 15.
  • the cylinder 14 is mounted on the bevel gear 13 by means of a needle bearing 16 in the housing 1.
  • an excitation piston 17 is axially displaceably guided.
  • the excitation piston 17 is connected by means of a connecting rod 18 to a crank pin 7b of the crankshaft 7 and is set in a reciprocating motion when the crankshaft 7 is rotated.
  • a percussion piston 19 is also axially displaceably guided in the cylinder 14.
  • a drill 22 is inserted, which is acted upon by the percussion piston 19. The rotary movement is transmitted to the drill 22 via the cylinder 14.
  • FIG. 2 shows the projection 9a of the bearing block, which is pivotably mounted in the bore 1a of the housing 1. Since the crankshaft 7 is mounted coaxially in the bearing block 9, the position of the radial bearing 8 is not changed by the pivoting of the bearing block 9.
  • the part of the bearing block 9 which receives the angular contact ball bearing 12 is provided with two opposing support surfaces 9b.
  • Force measuring elements 23 arranged in recesses 1b of the housing 1 are stressed by the reaction forces arising during the torque transmission from the crankshaft 7 to the pinion shaft 11.
  • the signal from the force measuring elements 23 is used to generate control functions of the hand tool and can be used, for example, to switch off the energy supply, to actuate a clutch or brake and the like.
  • the force measuring elements 23 are preferably made of piezoceramic. Such elements generate an electrical charge when subjected to pressure, which can be converted into a voltage. By arranging two opposing force measuring elements 23, the forces occurring in both directions of rotation can be detected when the direction of rotation of the motor 5 is reversed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP85810591A 1985-03-29 1985-12-12 Outil manuel à moteur Expired - Lifetime EP0199883B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853511437 DE3511437A1 (de) 1985-03-29 1985-03-29 Motorisch betriebenes handwerkzeug
DE3511437 1985-03-29

Publications (3)

Publication Number Publication Date
EP0199883A2 true EP0199883A2 (fr) 1986-11-05
EP0199883A3 EP0199883A3 (en) 1988-04-20
EP0199883B1 EP0199883B1 (fr) 1990-08-08

Family

ID=6266683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810591A Expired - Lifetime EP0199883B1 (fr) 1985-03-29 1985-12-12 Outil manuel à moteur

Country Status (3)

Country Link
EP (1) EP0199883B1 (fr)
JP (1) JPS61226278A (fr)
DE (2) DE3511437A1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647978A1 (en) * 1989-05-31 1990-12-07 Peugeot Outillage Elect Electric machine with torque limitation, especially screwdriver and/or drill
WO1992018291A1 (fr) * 1991-04-12 1992-10-29 Robert Bosch Gmbh Machine a main avec capteur de blocage
FR2767737A1 (fr) * 1997-09-01 1999-03-05 Bosch Gmbh Robert Outil electrique
DE10316844A1 (de) * 2003-04-11 2004-11-04 Hilti Ag Steuerung einer Elektrohandwerkzeugmaschine
US7938194B2 (en) 2003-04-24 2011-05-10 Black & Decker Inc. Safety mechanism for a rotary hammer
DE102010041313A1 (de) * 2010-09-07 2012-03-08 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine
US8316958B2 (en) 2006-07-13 2012-11-27 Black & Decker Inc. Control scheme for detecting and preventing torque conditions in a power tool
EP2669061A1 (fr) * 2012-05-29 2013-12-04 Makita Corporation Outil électrique
USD703017S1 (en) 2011-01-07 2014-04-22 Black & Decker Inc. Screwdriver
US9199362B2 (en) 2010-01-07 2015-12-01 Black & Decker Inc. Power tool having rotary input control
US9266178B2 (en) 2010-01-07 2016-02-23 Black & Decker Inc. Power tool having rotary input control
US9475180B2 (en) 2010-01-07 2016-10-25 Black & Decker Inc. Power tool having rotary input control
US10589413B2 (en) 2016-06-20 2020-03-17 Black & Decker Inc. Power tool with anti-kickback control system
US11697200B2 (en) 2017-07-24 2023-07-11 Festool Gmbh Power tool and method
US12496682B2 (en) 2022-08-15 2025-12-16 Techtronic Cordless Gp Die grinder with an offset gear transmission

Families Citing this family (8)

* 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
EP0303651B2 (fr) * 1987-03-05 1999-12-01 Robert Bosch Gmbh Procede d'interruption de l'entrainement, en particulier en percussion et/ou en rotation, d'un outil a main
DE3707051A1 (de) * 1987-03-05 1988-09-15 Bosch Gmbh Robert Verfahren zum unterbrechen der antriebstaetigkeit, insbesondere zumindest der schlagantriebstaetigkeit, einer handwerkzeugmaschine
DE10348397A1 (de) * 2003-10-17 2005-05-19 Robert Bosch Gmbh Schlagwerk für eine Handwerkzeugmaschine
US7552781B2 (en) 2004-10-20 2009-06-30 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
EP2163355A1 (fr) 2008-09-12 2010-03-17 AEG Electric Tools GmbH Outil électrique comprenant un entraînement oscillant ou vilebrequin ayant une masse réduite
JP5534783B2 (ja) * 2009-11-10 2014-07-02 株式会社マキタ 電動工具
GB2490447A (en) 2010-01-07 2012-10-31 Black & Decker Inc Power screwdriver having rotary input control

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2054787A (en) * 1930-12-10 1936-09-22 Western Electric Co Measuring device
CH499035A (fr) * 1969-08-22 1970-11-15 Pignons Sa Dispositif de transmission mécanique à déclenchement automatique en fonction du couple transmis
DE2149017A1 (de) * 1971-10-01 1973-04-05 Erwin Halstrup Mit einem einstellbaren ansprechmoment versehene einrichtung zur automatischen drehmomentabschaltung von getrieben
US3832897A (en) * 1973-04-02 1974-09-03 C Schenck Stationary device sensitive to torque in rotating shafts
DE2410114C2 (de) * 1974-03-02 1983-01-13 Friedrich 7146 Tamm Schell Vorrichtung zur Drehmomentabschaltung eines Getriebes
DE2731090C2 (de) * 1977-07-09 1983-09-15 Nagel, Peter, 7442 Neuffen Drehmoment-Schrauber
US4346769A (en) * 1978-12-12 1982-08-31 Black & Decker Inc. Percussive tool drive linkage
GB2074286B (en) * 1980-04-18 1983-10-05 Pitcraft Summit Ltd Torque-responsive mounting of gears in a gearbox
DE3142682C2 (de) * 1981-10-28 1986-06-19 Black & Decker, Inc. (Eine Gesellschaft N.D.Ges.D. Staates Delaware), Newark, Del. Elektrowerkzeug, insbesondere Handwerkzeug
DE3146494C2 (de) * 1981-11-24 1986-10-30 Black & Decker, Inc. (Eine Gesellschaft N.D.Ges.D. Staates Delaware), Newark, Del. Elektrowerkzeug, insbesondere Handwerkzeug, mit Drehmomentüberwachung

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647978A1 (en) * 1989-05-31 1990-12-07 Peugeot Outillage Elect Electric machine with torque limitation, especially screwdriver and/or drill
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
FR2767737A1 (fr) * 1997-09-01 1999-03-05 Bosch Gmbh Robert Outil electrique
DE10316844A1 (de) * 2003-04-11 2004-11-04 Hilti Ag Steuerung einer Elektrohandwerkzeugmaschine
US7938194B2 (en) 2003-04-24 2011-05-10 Black & Decker Inc. Safety mechanism for a rotary hammer
US8555997B2 (en) 2003-04-24 2013-10-15 Black & Decker Inc. Safety mechanism for a rotary hammer
US8316958B2 (en) 2006-07-13 2012-11-27 Black & Decker Inc. Control scheme for detecting and preventing torque conditions in a power tool
US9475180B2 (en) 2010-01-07 2016-10-25 Black & Decker Inc. Power tool having rotary input control
US9321155B2 (en) 2010-01-07 2016-04-26 Black & Decker Inc. Power tool having switch and rotary input control
US10160049B2 (en) 2010-01-07 2018-12-25 Black & Decker Inc. Power tool having rotary input control
US9321156B2 (en) 2010-01-07 2016-04-26 Black & Decker Inc. Power tool having rotary input control
US9199362B2 (en) 2010-01-07 2015-12-01 Black & Decker Inc. Power tool having rotary input control
US9211636B2 (en) 2010-01-07 2015-12-15 Black & Decker Inc. Power tool having rotary input control
US9266178B2 (en) 2010-01-07 2016-02-23 Black & Decker Inc. Power tool having rotary input control
CN102398254B (zh) * 2010-09-07 2016-02-17 罗伯特·博世有限公司 工具机、尤其手持式工具机
CN102398254A (zh) * 2010-09-07 2012-04-04 罗伯特·博世有限公司 工具机、尤其手持式工具机
DE102010041313A1 (de) * 2010-09-07 2012-03-08 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine
DE102010041313B4 (de) 2010-09-07 2021-09-23 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine
USD703017S1 (en) 2011-01-07 2014-04-22 Black & Decker Inc. Screwdriver
US9505097B2 (en) 2012-05-29 2016-11-29 Makita Corporation Power tool
EP2669061A1 (fr) * 2012-05-29 2013-12-04 Makita Corporation Outil électrique
US10589413B2 (en) 2016-06-20 2020-03-17 Black & Decker Inc. Power tool with anti-kickback control system
US11192232B2 (en) 2016-06-20 2021-12-07 Black & Decker Inc. Power tool with anti-kickback control system
US11697200B2 (en) 2017-07-24 2023-07-11 Festool Gmbh Power tool and method
EP3618999B1 (fr) * 2017-07-24 2024-08-14 Festool GmbH Outil électrique et procédé
US12496682B2 (en) 2022-08-15 2025-12-16 Techtronic Cordless Gp Die grinder with an offset gear transmission

Also Published As

Publication number Publication date
DE3579160D1 (de) 1990-09-13
EP0199883A3 (en) 1988-04-20
EP0199883B1 (fr) 1990-08-08
JPS61226278A (ja) 1986-10-08
DE3511437A1 (de) 1986-10-02

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