EP3009236A1 - Machine-outil portative de burinage - Google Patents

Machine-outil portative de burinage Download PDF

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Publication number
EP3009236A1
EP3009236A1 EP14189134.1A EP14189134A EP3009236A1 EP 3009236 A1 EP3009236 A1 EP 3009236A1 EP 14189134 A EP14189134 A EP 14189134A EP 3009236 A1 EP3009236 A1 EP 3009236A1
Authority
EP
European Patent Office
Prior art keywords
speed
motor
idle
nominal
chiseling
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Withdrawn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
EP14189134.1A
Other languages
German (de)
English (en)
Inventor
Eric Mascall
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
Priority to EP14189134.1A priority Critical patent/EP3009236A1/fr
Priority to US15/518,550 priority patent/US20170274517A1/en
Priority to EP15784305.3A priority patent/EP3206839A1/fr
Priority to PCT/EP2015/073620 priority patent/WO2016059017A1/fr
Publication of EP3009236A1 publication Critical patent/EP3009236A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable 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
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/131—Idling mode of tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/255—Switches

Definitions

  • the present invention relates to a chisel hand tool with a motor-driven pneumatic impact mechanism and a control method.
  • EP 1170095 A2 discloses a rotary hammer having a motor driven pneumatic percussion.
  • the hammer mechanism has a periodically forcibly excited exciter piston along a working axis.
  • An air spring formed by a pneumatic chamber between the exciter piston and a racket couples the racket to the exciter piston.
  • Efficient operation of the impact mechanism is achieved with a nominal stroke rate of the club;
  • the motor rotates at a corresponding nominal speed.
  • the hammer detects idling of the hammer mechanism. Idling typically occurs when the user lifts the hammer from a ground and blows the tool into the air. The hammer reduces the engine speed when idling.
  • the rotary hammer automatically increases the speed from the idling speed to the nominal speed when the user attaches the hammer to the ground with the tool.
  • the reduction of the speed to the idling speed is perceived by the user, when initially setting the tool, the drums output only a small power until the motor is accelerated to the nominal speed.
  • a chisel hand tool has a motor and a pneumatic percussion driven by the motor.
  • the user can choose between at least two idle speeds via a selector switch.
  • a motor control regulates in chiseling operation a speed of the motor to a nominal speed.
  • the nominal speed is not adjustable by the user and given for optimum efficiency of the impact mechanism.
  • the engine control adjusts the engine speed to the selected idle speed when the hammer mechanism is idling. At least one of the selectable idle speeds is greater than the nominal speed.
  • the hand tool has a fast response and high Degrading performance. Another of the selectable idle speeds may be equal to the nominal speed.
  • the Schlagtechnik starts slower and allows finer work.
  • the power tool has exactly two adjustable idle speeds, one greater than nominal and one equal to nominal speed.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, such as a chisel 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 .
  • a battery pack or power cord supplies power to the motor 5 .
  • a user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation. In operation, the hammer drill 1 rotates the chisel 4 continuously about a working axis 10 and can thereby beat the chisel 4 in the direction of impact 11 along the working axis 10 into a base.
  • the percussion 6 is a pneumatic percussion 6.
  • An exciter piston 12 and a racket 13 are guided in a guide tube 14 in the striking mechanism 6 along the working axis 10 movable.
  • the exciter piston 12 is coupled via a swash plate 15 to the motor 5 and forced to a periodic, linear movement.
  • a wobble finger 16 connects the swash plate 15 with the excitation piston 12.
  • An air spring formed by a pneumatic chamber 17 between the exciter piston 12 and the racket 13 couples a movement of the racket 13 to the movement of the exciter piston 12 .
  • the bat 13 can strike directly on a rear end of the bit 4 or indirectly via a substantially quiescent striker 18 a portion of its pulse on the chisel. 4 transfer.
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 19 .
  • a motor controller 20 controls the speed of the motor 5.
  • the speed is adjusted in the chiseling operation to a nominal speed.
  • the Schlagtechnik 6 has the highest efficiency at the nominal speed.
  • the movement of the racket 13 has due to the mass of the racket 13 and the coupling strength of the air spring, a natural periodicity, to which the periodicity of the movement of the excitation piston 12 is tuned at the nominal speed.
  • the pneumatic chamber 17 is hermetically sealed from the environment. An air inflow or leakage air leakage is orders of magnitude less than the volume moved by the exciter piston 12 .
  • the striking mechanism 6 has a valve 21, which allows an exchange of air of the pneumatic chamber 17 with the environment.
  • the valve 21 is essentially a radial opening in the guide tube 14, which is closed or opened relative to the pneumatic chamber 17 by the racket 13 .
  • the bat 13 is stopped in chiseling operation in the direction of impact 11 by the striker 18 or the tool in a beating point, which are pushed by the contact pressure of the user in the striking mechanism 6 to a stop 22 .
  • the opening is offset in the direction of impact 11 as far as the impact point that the bat 13 covers the opening in the impact point.
  • the tool and the striker 18 can be offset relative to the stop 22 in the direction of impact 11 .
  • the bat 13 slides correspondingly beyond the impact point before it is stopped by the striker 18 .
  • the opening is arranged along the working axis 10 so that the racket 13 releases the opening, ergo the pneumatic chamber 17 with the opening along the working axis 10 overlaps.
  • the air exchange of the environment with the pneumatic chamber 17 decouples the racket 13 from the exciter piston 12.
  • the striking mechanism 6 is in an idling.
  • a motor controller 20 may detect the idling, for example, at the lower power consumption of the motor 5 .
  • the engine controller 20 compares the power consumption with a first threshold.
  • the engine controller 20 reduces the speed of the engine to an idling speed.
  • the engine 5 maintains the idle speed as long as the user keeps the system switch 9 pressed.
  • the motor controller 20 increases the speed of the motor 5 to the nominal speed as soon as the user presses the hammer 1 to the ground.
  • the current consumption of the motor 5 rises above a second threshold, which is lower than the first threshold value.
  • the hammer drill 1 has a selector switch 24, via which the idle speed is set.
  • the selector switch 24 has, for example, two positions.
  • the idle speed is greater in the first position than in the second position.
  • the first idle speed is between 120% to 140% of the nominal speed.
  • the first idle speed is preferably at the threshold at which the pneumatic impact mechanism 6 just starts.
  • the second idle speed is equal to the nominal speed, for example.
  • Idle can be done in place of or in addition to current sensing via other sensors.
  • a position sensor can detect the position of the beatpiece 18 . If the striker 18 abuts on the stop 22 , the hammer drill 1 is in the chiseling operation, the striker 18 is displaced relative to the stop 22 , the hammer drill 1 is in the idle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP14189134.1A 2014-10-16 2014-10-16 Machine-outil portative de burinage Withdrawn EP3009236A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP14189134.1A EP3009236A1 (fr) 2014-10-16 2014-10-16 Machine-outil portative de burinage
US15/518,550 US20170274517A1 (en) 2014-10-16 2015-10-13 Hand-held chiselling machine tool
EP15784305.3A EP3206839A1 (fr) 2014-10-16 2015-10-13 Machine-outil portative de burinage
PCT/EP2015/073620 WO2016059017A1 (fr) 2014-10-16 2015-10-13 Machine-outil portative de burinage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14189134.1A EP3009236A1 (fr) 2014-10-16 2014-10-16 Machine-outil portative de burinage

Publications (1)

Publication Number Publication Date
EP3009236A1 true EP3009236A1 (fr) 2016-04-20

Family

ID=51703071

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14189134.1A Withdrawn EP3009236A1 (fr) 2014-10-16 2014-10-16 Machine-outil portative de burinage
EP15784305.3A Withdrawn EP3206839A1 (fr) 2014-10-16 2015-10-13 Machine-outil portative de burinage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP15784305.3A Withdrawn EP3206839A1 (fr) 2014-10-16 2015-10-13 Machine-outil portative de burinage

Country Status (3)

Country Link
US (1) US20170274517A1 (fr)
EP (2) EP3009236A1 (fr)
WO (1) WO2016059017A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110072672A (zh) * 2016-12-14 2019-07-30 喜利得股份公司 用于冲击式手持工具机的控制方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022188996A (ja) * 2021-06-10 2022-12-22 株式会社マキタ 回転打撃工具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1170095A2 (fr) 2000-07-08 2002-01-09 HILTI Aktiengesellschaft Outil à main électrique avec interruption de marche en vide
WO2013174641A1 (fr) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Unité de percussion
DE102012208913A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
DE102012208916A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4401664B4 (de) * 1994-01-21 2008-12-18 Robert Bosch Gmbh Bohrhammer mit einer elektronischen Regeleinrichtung und einem Betriebsartenschalter
DE10145464C2 (de) * 2001-09-14 2003-08-28 Wacker Construction Equipment Bohr- und/oder Schlaghammer mit anpressdruckabhängiger Leerlaufsteuerung
DE10316844A1 (de) * 2003-04-11 2004-11-04 Hilti Ag Steuerung einer Elektrohandwerkzeugmaschine
WO2007103109A2 (fr) * 2006-03-03 2007-09-13 Black & Decker Inc. Outil electrique sans fil ayant un entrainement a plusieurs vitesses et une vitesse constante dans une plage de couple leger
DE102006029363A1 (de) * 2006-06-27 2008-01-03 Robert Bosch Gmbh Elektrohandwerkzeug
GB0801305D0 (en) * 2008-01-24 2008-03-05 Black & Decker Inc A control mechanism for a power tool
GB0801868D0 (en) * 2008-02-01 2008-03-12 Black & Decker Inc Power tool having motor speed monitor
DE102012202278A1 (de) * 2012-02-15 2013-08-22 Hilti Aktiengesellschaft Handwerkzeugmaschine
DE102012208870A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
DE102013201708B4 (de) * 2013-02-01 2023-12-14 Robert Bosch Gmbh Elektrische Werkzeugmaschine und Verfahren zum Steuern der elektrischen Werkzeugmaschine
DE102013212546B4 (de) * 2013-06-28 2023-12-14 Robert Bosch Gmbh Handwerkzeugmaschinenbedienvorrichtung
JP6235872B2 (ja) * 2013-11-07 2017-11-22 株式会社マキタ 作業工具
JP6367617B2 (ja) * 2014-06-23 2018-08-01 株式会社マキタ 往復動式作業工具

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1170095A2 (fr) 2000-07-08 2002-01-09 HILTI Aktiengesellschaft Outil à main électrique avec interruption de marche en vide
WO2013174641A1 (fr) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Unité de percussion
DE102012208913A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
DE102012208916A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110072672A (zh) * 2016-12-14 2019-07-30 喜利得股份公司 用于冲击式手持工具机的控制方法
CN110072672B (zh) * 2016-12-14 2022-05-06 喜利得股份公司 用于冲击式手持工具机的控制方法

Also Published As

Publication number Publication date
US20170274517A1 (en) 2017-09-28
WO2016059017A1 (fr) 2016-04-21
EP3206839A1 (fr) 2017-08-23

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