EP3206839A1 - Machine-outil portative de burinage - Google Patents

Machine-outil portative de burinage

Info

Publication number
EP3206839A1
EP3206839A1 EP15784305.3A EP15784305A EP3206839A1 EP 3206839 A1 EP3206839 A1 EP 3206839A1 EP 15784305 A EP15784305 A EP 15784305A EP 3206839 A1 EP3206839 A1 EP 3206839A1
Authority
EP
European Patent Office
Prior art keywords
speed
motor
nominal
idling
idle
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Withdrawn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
EP15784305.3A
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
Publication of EP3206839A1 publication Critical patent/EP3206839A1/fr
Withdrawn legal-status Critical Current

Links

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 1 170095 A2 discloses a rotary hammer having a pneumatic percussion driven by a motor.
  • 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 the tool is initially applied, the drivetrain initially delivers only a small amount of power until the motor has 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 a hammer drill
  • Fig. 1 shows, as an example of a chiseling hand tool machine schematically a hammer drill 1.
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, e.g. 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 perform the hammer drill 1 by means of a handle 8 and take the hammer drill 1 by means of a system switch 9 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 exciter 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 point of impact, which are pushed by the contact pressure of the user in the percussion 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.
  • a motor controller 20 may detect the idling, for example, at the lower power consumption of the motor 5. For example, 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.
  • pressing the valve 21 is closed and the racket 13 to the excitation piston 12, albeit inefficient, coupled.
  • 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 idling speed is for example 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. At a higher speed, the excitation piston 12 moves too fast to excite the bat 13 via the air spring.
  • 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)

Abstract

L'invention concerne une machine-outil portative de burinage 1 comprenant un moteur 5 et un mécanisme de frappe pneumatique 6 entraîné par le moteur 5. L'utilisateur peut choisir entre au moins deux régimes de ralenti à l'aide d'un commutateur sélectif 24. Une commande de moteur 20 assure le réglage en mode de burinage d'un régime du moteur 5 à un régime nominal. Le régime nominal ne peut pas être réglé par l'utilisateur, il est prédéfini en termes de rendement optimal du mécanisme de frappe 6. La commande de moteur 20 assure le réglage du régime du moteur 5 à un régime de ralenti choisi, lorsque le mécanisme de réglage 6 est en mode ralenti. Au moins un des régimes de ralenti sélectionnables est supérieur au régime nominal.
EP15784305.3A 2014-10-16 2015-10-13 Machine-outil portative de burinage Withdrawn EP3206839A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14189134.1A EP3009236A1 (fr) 2014-10-16 2014-10-16 Machine-outil portative de burinage
PCT/EP2015/073620 WO2016059017A1 (fr) 2014-10-16 2015-10-13 Machine-outil portative de burinage

Publications (1)

Publication Number Publication Date
EP3206839A1 true EP3206839A1 (fr) 2017-08-23

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 Before (1)

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

Country Status (3)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3335837A1 (fr) * 2016-12-14 2018-06-20 HILTI Aktiengesellschaft Procédé de commande pour une machine-outil manuelle à percussion
JP7696237B2 (ja) * 2021-06-10 2025-06-20 株式会社マキタ 回転打撃工具

Family Cites Families (17)

* 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
DE10033362A1 (de) 2000-07-08 2002-01-17 Hilti Ag Elektrohandwerkzeug mit Leerschlagabschaltung
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
CN201263135Y (zh) * 2006-03-03 2009-06-24 布莱克和戴克公司 在轻扭矩范围内具多速度传动和恒定速度的无缆电动工具
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
DE102012208916A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
DE102012208913A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
WO2013174641A1 (fr) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Unité de percussion
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

Also Published As

Publication number Publication date
US20170274517A1 (en) 2017-09-28
WO2016059017A1 (fr) 2016-04-21
EP3009236A1 (fr) 2016-04-20

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