EP1391271B1 - Safety device for multi-function handtool - Google Patents

Safety device for multi-function handtool Download PDF

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Publication number
EP1391271B1
EP1391271B1 EP20030102526 EP03102526A EP1391271B1 EP 1391271 B1 EP1391271 B1 EP 1391271B1 EP 20030102526 EP20030102526 EP 20030102526 EP 03102526 A EP03102526 A EP 03102526A EP 1391271 B1 EP1391271 B1 EP 1391271B1
Authority
EP
European Patent Office
Prior art keywords
step
movement
axial
atc
safety module
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.)
Active
Application number
EP20030102526
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German (de)
French (fr)
Other versions
EP1391271A3 (en
EP1391271A2 (en
Inventor
Claus Osselmann
Stefan Groer
Peter Hellmann
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
Priority to DE2002137898 priority Critical patent/DE10237898B3/en
Priority to DE10237898 priority
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP1391271A2 publication Critical patent/EP1391271A2/en
Publication of EP1391271A3 publication Critical patent/EP1391271A3/en
Application granted granted Critical
Publication of EP1391271B1 publication Critical patent/EP1391271B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D16/00Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25FCOMBINATION 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
    • B25F5/00Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for

Description

  • The invention relates to a security module and an associated control method for a multifunctional hand tool machine, in particular a combination hammer with chisel function.
  • In rotating power tools exists in the workpiece jamming tools the possibility of unwanted rotation of the housing, which leads the user in his hand. To prevent this effect, a variety of safety modules are used to safely interrupt the power flow between the electric motor and the tool, for example, based on the angular acceleration based Verdrehsensorsignal. In purely beating modes of operation, such as chiselling, however, strong movements of the housing, as they occur, for example. When slipping the chisel, permissible and interrupting the power flow in such situations by the user undesirable.
  • After DE19628945A1 For example, a rotating hand tool machine has an ATC safety module with a twofold integration of a twisting motion. The content of this document, which is hereby included in the disclosure content, serves the skilled person for understanding an ATC security module.
  • After DE4334933C For example, in a rotating hand tool machine for a rotating tool, an anti-torque control (ATC) safety module which interrupts the drive train in case of impermissible twisting of the housing, wherein permissible spatial movements of multiaxial accelerometers are detected and evaluated by a fuzzy logic, which in deactivates the ATC safety module for this permissible movement. Different operating modes are not covered by the ATC safety module.
  • DE19942156A1 Considered to be the closest prior art, a rotary and hammering combing hammer with chisel function has an ATC safety module with an angular acceleration sensitive rotation sensor. The ATC safety module queries the operating modes of the combi hammers via a Hall sensor on the mode selector switch and the ATC safety module only switched off when exclusively beating mode. In particular, the ATC safety module is deactivated in all-hitting chisel mode, but active in impact drilling mode or rotary drilling mode. Because of the switching delay, the real mode does not immediately follow the position of the mode selector switch, causing the ATC safety module to detect a wrong mode in a short inter-span and to be inactive in the protected-switch mode, especially when switching from a still-rotating mode to exclusive mode beating fashion is disadvantageous.
  • From the WO 88/06508 A a hand tool machine is known in which a clutch is interrupted, if a sensor detects reaching a lying on an idling path position by a tool.
  • The object of the invention is to realize an ATC safety module, which is always active in the protected mode, for a multifunctional hand-held power tool.
  • The object is essentially achieved by the features of the independent claims. Advantageous developments emerge from the subclaims.
  • In essence, a multifunctional hand tool machine with an at least partially axially impacting tool holder and a handheld housing on an ATC security module with a sensitive angular movement for torsion, wherein the ATC security module is connected to an axial movement sensor.
  • By combining the ATC safety module with the axial motion sensor, the ATC safety module also has the axial movement information available, allowing a protection-free mode associated with large axial movements to be recognized directly by the ATC safety module.
  • In the first step, the determination of a rotational movement of the housing takes place in the control method assigned to an ATC safety module, wherein a binary control signal is generated in the second step when exceeding a Verdungsgrenzwertes by the rotational movement, which safely interrupts the power flow between the electric motor and the tool in the last step , In addition, in the first step, an axial movement of the housing is determined, which suppresses the binary control signal in the second step when exceeding an axial limit by the axial movement.
  • By suppressing the control signal for the interruption of the power flow, an always active ATC safety module in the actual exclusive impact mode becomes ineffective for large axial movements.
  • Advantageously, the determined axial movement is integrated twice in time, whereby a determined Axialbeschleunigungswert is converted into an axial path and is comparable with an axial amplitude as the axial limit.
  • The invention will be explained in more detail with reference to an advantageous embodiment with a representation of the control method.
  • According to the illustration, a control method shown in the block diagram is implemented as control algorithm within a microcontroller 2 in an optionally combined with respect to a tool axis A rotating and beating hand tool with an ATC security module 1, which on the input side with a Verdrehbewegungssensor 3 in the form of an oriented relative to the tool axis A angular acceleration sensor and is connected to an axial movement sensor 4 in the form of an acceleration sensor arranged axially relative to the tool axis A, and on the output side to generate a binary control signal 5 for controlling a safety coupling 8 arranged between an electric motor 6 and a tool holder 7 in the force flow. After the block diagram, the determined rotational movement or axial movement are partially integrated into integrators 9 in two multipliers and multiplied by multipliers 10 and finally added in an adder 11 in the form of a general equation of motion second degree to each of a comparator 12a, 12b, to which they each are compared to a Verdrehgrenzwert 13a and an axial limit 13b. A binary Verdrehsteuersignal 14a of the comparator 12a and a binary Axialsteuersignal 14b of the comparator 12b are linked in a downstream AND gate 15 to the binary control signal 5.

Claims (3)

  1. Multifunction hand tool with a tool pickup (7), which is at least partly axially striking, a safety connection (8) arranged between this and an electric motor (6) in the flow of power, a hand held casing and an ATC safety module (1) with a twisting sensor (3), which is sensitive to an angular movement, characterised in that the ATC safety module (1) is connected to an axial movement sensor (4) to convert the ATC safety module into a protection free mode in the case of large axial movements.
  2. Control method for controlling a hand tool according to claim 1, in which in a first step a twisting movement of the casing is identified, in which in the second step a binary control signal (5) is produced when a twisting limit value (13a) is exceeded by the twisting movement, which in the last step safely interrupts the flow of power between the electric motor (6) and the tool pickup (7), characterised in that in the first step an axial movement of the casing is also identified and that in the second step the binary control signal (5) is suppressed when an axial limit value (13b) is exceeded by the axial movement.
  3. Control method according to claim 2, characterised in that the axial movement identified in the first step is double time integrated.
EP20030102526 2002-08-19 2003-08-13 Safety device for multi-function handtool Active EP1391271B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2002137898 DE10237898B3 (en) 2002-08-19 2002-08-19 Safety module for multifunctional, rotating and striking hand tool
DE10237898 2002-08-19

Publications (3)

Publication Number Publication Date
EP1391271A2 EP1391271A2 (en) 2004-02-25
EP1391271A3 EP1391271A3 (en) 2008-07-16
EP1391271B1 true EP1391271B1 (en) 2011-01-19

Family

ID=30775421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030102526 Active EP1391271B1 (en) 2002-08-19 2003-08-13 Safety device for multi-function handtool

Country Status (4)

Country Link
US (1) US6843140B2 (en)
EP (1) EP1391271B1 (en)
JP (2) JP2004074404A (en)
DE (2) DE10237898B3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8286723B2 (en) 2010-01-07 2012-10-16 Black & Decker Inc. Power screwdriver having rotary input control
US8418778B2 (en) 2010-01-07 2013-04-16 Black & Decker Inc. Power screwdriver having rotary input control
USRE44311E1 (en) 2004-10-20 2013-06-25 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7395871B2 (en) * 2003-04-24 2008-07-08 Black & Decker Inc. Method for detecting a bit jam condition using a freely rotatable inertial mass
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
DE102009000515A1 (en) * 2009-01-30 2010-08-05 Hilti Aktiengesellschaft Control method and hand tool
EP2631035B1 (en) 2012-02-24 2019-10-16 Black & Decker Inc. Power tool
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
FR2985447B1 (en) 2012-01-05 2014-09-05 Illinois Tool Works Rotary hand tool with anti-rotation control module
US10589413B2 (en) 2016-06-20 2020-03-17 Black & Decker Inc. Power tool with anti-kickback control system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464503A (en) * 1968-06-25 1969-09-02 Black & Decker Mfg Co Measuring device for impact tool
US4648568A (en) * 1985-05-28 1987-03-10 Phillips Richard G Emergency anti-torque control system and method for helicopters
EP0303651B2 (en) * 1987-03-05 1999-12-01 Robert Bosch Gmbh Process for interrupting the operation of a hand tool, in particular percussion and/or rotation thereof
US5232183A (en) * 1991-03-06 1993-08-03 The Boeing Company Helicopter anti-torque control system utilizing exhaust gas
US5637973A (en) * 1992-06-18 1997-06-10 Kabushiki Kaisha Yaskawa Denki Noncontacting electric power transfer apparatus, noncontacting signal transfer apparatus, split-type mechanical apparatus employing these transfer apparatus and a control method for controlling same
DE4334933C2 (en) * 1993-10-13 1997-02-20 Fraunhofer Ges Forschung Method and device for forcibly switching off hand-held tools
DE19628945A1 (en) * 1995-11-02 1997-05-07 Bosch Gmbh Robert Process for interrupting the driving activity of a hand tool, and hand tool working according to this process
DE19942156A1 (en) * 1999-09-03 2001-03-08 Hilti Ag Switching device for multifunctional hand-held machine tools

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE44311E1 (en) 2004-10-20 2013-06-25 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
USRE44993E1 (en) 2004-10-20 2014-07-08 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
USRE45112E1 (en) 2004-10-20 2014-09-09 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor
US8286723B2 (en) 2010-01-07 2012-10-16 Black & Decker Inc. Power screwdriver having rotary input control
US8418778B2 (en) 2010-01-07 2013-04-16 Black & Decker Inc. Power screwdriver having rotary input control

Also Published As

Publication number Publication date
EP1391271A3 (en) 2008-07-16
US6843140B2 (en) 2005-01-18
JP4362050B2 (en) 2009-11-11
JP2004074404A (en) 2004-03-11
JP2004202675A (en) 2004-07-22
EP1391271A2 (en) 2004-02-25
DE10237898B3 (en) 2004-03-18
DE50313420D1 (en) 2011-03-03
US20040104034A1 (en) 2004-06-03

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