EP3068585B1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
EP3068585B1
EP3068585B1 EP14793129.9A EP14793129A EP3068585B1 EP 3068585 B1 EP3068585 B1 EP 3068585B1 EP 14793129 A EP14793129 A EP 14793129A EP 3068585 B1 EP3068585 B1 EP 3068585B1
Authority
EP
European Patent Office
Prior art keywords
exciter
valve
striker
housing
impact
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
EP14793129.9A
Other languages
German (de)
English (en)
Other versions
EP3068585A1 (fr
Inventor
Aaron Wiedner
Markus Hartmann
Manuel Serf
Eduard Pfeiffer
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 EP14793129.9A priority Critical patent/EP3068585B1/fr
Publication of EP3068585A1 publication Critical patent/EP3068585A1/fr
Application granted granted Critical
Publication of EP3068585B1 publication Critical patent/EP3068585B1/fr
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Anticipated expiration legal-status Critical

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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
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • B25D17/245—Damping the reaction force using a fluid
    • 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
    • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
    • 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
    • B25D2250/185—Pressure equalising means between sealed chambers
    • 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
    • B25D2250/231—Sleeve details
    • 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
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other

Definitions

  • the present invention relates to a hand tool machine provided with a motor-driven pneumatic impact mechanism according to the preamble of claim 1 and as shown in FIG EP 2 653 267 A1 known.
  • EP2130651A1 shows a hammer drill with the generic pneumatic percussion.
  • a motor drives an exciter piston in a guide tube by means of an eccentric wheel.
  • An also arranged in the guide tube racket is coupled by the formed between the exciter piston and the racket air spring in the form of a pneumatic chamber to the movement of the racket.
  • the bat strikes periodically in the direction of impact on a largely resting intermediate racket, which forwards the impact pulse to a tool.
  • the pneumatic impact mechanism exerts only minor force peaks on the user compared to a mechanical impact mechanism, because the club is only weakly coupled to the exciter when it hits the air spring. In the initial acceleration of the racket by the exciter in the direction of impact, however, the air spring is highly compressed and therefore strongly coupling, so this phase is felt by the user.
  • a hand tool according to claim 1 is provided.
  • the hand tool of the invention has a tool holder for receiving a chiseling tool on a working axis, a motor and a striking mechanism.
  • the percussion includes a club guided on the working axis, a periodically driven exciter by the motor, and a pneumatic chamber for coupling the movement of the racket to the periodic motion of the exciter.
  • the bat hits the tool or an intermediate bat in the direction of impact at the point of impact.
  • the exciter is driven between a first dead center remote from the impact point and a second dead center near the impact point.
  • the pneumatic chamber is formed between the racket and a racket facing the front side of the exciter.
  • An airtight encapsulated housing has an interior space which is closed by a face of the pathogen facing away from the racket. Of the Interior is connected by a closable by the racket, the first valve with the pneumatic chamber. In addition, the interior is connected to a closable by the exciter, the second valve with the pneumatic chamber. The first valve is located near the impact point and the second valve near the first dead center.
  • the interior is significantly larger than the pneumatic chamber, for example, the housing contains all or part of the transmission, e.g. an eccentric wheel.
  • the exciter generates with its back a small, but existing pressure fluctuation compared to the pneumatic chamber. It turns out that this can be used to reduce the occurring during the initial acceleration phase retroactive peak force.
  • the pressure in the pneumatic chamber is increased by the pressure balance between the interior and the pneumatic chamber when the second valve is opened. Due to the arrangement, the opening of the valve occurs when the exciter is near the first dead center. During operation, the pressure in the interior is slightly increased, reduced in the pneumatic chamber.
  • the short-term ventilation hereby causes an increase in the pressure in the air spring and extends the duration of the coupling of the racquet to the exciter. The pathogen can accelerate the bat over a longer period of time, thereby reducing the force peaks.
  • the venting of the pneumatic chamber takes place when the bat is near the point of impact.
  • the control is carried out by the racket, so that the start of the percussion after a few cycles of the pathogen is possible.
  • 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 chiseling drill 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 .
  • the electric motor 5 is powered, for example, by a battery 8 .
  • a user can guide the hammer drill 1 by means of a handle 9 and be by means of a system switch 10 to the hammer drill 1 is in operation. In operation, the hammer drill 1 rotates the drill 4 continuously about a working axis 11 and can beat the drill bit 4 in the direction of impact 12 along the working axis 11 in a substrate.
  • the impact mechanism 6 is a pneumatic impact mechanism 6.
  • the exemplary impact mechanism 6 has a guide tube 13 with a cylindrical inner wall 14.
  • the guide tube 13 is located on the working axis 11.
  • a racket 15 is inserted into the guide tube 13 and in this along the working axis 11 movable.
  • the racket 15 is designed as a piston which terminates airtight with the inner wall 14 .
  • An exciter 16 is arranged in the direction of impact 12 in front of the racket 15 in the guide tube 13 .
  • the exemplary exciter 16 is also designed as a piston, which is airtight in the guide tube 13 along the working axis 11 with the inner wall 14 airtight.
  • the racket 15 and the exciter 16 close with their facing end faces 17, 18 between them a pneumatic chamber 19 a.
  • the pneumatic chamber 19 serves as an air spring, which couples a movement of the racket 15 to a movement of the exciter 16 .
  • the exciter 16 is coupled to a motor 5 via a transmission 20 .
  • the transmission 20 includes, for example, an eccentric 21, which converts the rotational movement of the motor 5 in a linear movement of the exciter 16 .
  • the eccentric 21 has a finger 22 which is eccentrically offset by a crank radius to a rotational axis 23 of the eccentric 21 .
  • a connecting rod 24 engages with one end of the finger 22 and is rotatably or pivotally suspended in the exciter 16 at another end.
  • the exciter 16 is forcibly attracted to a periodic movement, which along the working axis 11 between a first dead center 25 and a second dead center 26 ( Fig. 4 ).
  • the first dead center 25 is in the direction of impact 12 before the second dead center 26.
  • the lifting height 27 between the two dead centers 25, 26 is essentially predetermined by the crank radius.
  • a wobble finger can also be used, which moves the exciter 16 between the dead centers 25, 26 .
  • the transmission 20 may include reduction stages, torque clutches, etc.
  • the racket 15 follows coupled by the pneumatic chamber 19 of the movement of the exciter 16.
  • the movement of the racket 15 and the exciter 16 along the working axis 11 are in Fig. 4 shown.
  • the y-axis indicates the position of the racket 15 and the exciter 16 shown on the angular position of the eccentric wheel 21 on the x-axis.
  • the racket 15 and the exciter 16 are abstracted to describe their movement or position on a thin disc.
  • the racket 15 moves periodically in the direction of impact 12 to an impact point 28 and counter to the direction of impact 12 up to a reversal point 29.
  • the distance from impact point 28 to reversal point 29 is referred to below as the flight distance 30 .
  • the racket 15 strikes an intermediate racket 31 which, with its striking surface 32 facing the racket 15, defines the impact point 28 of the striking mechanism 6 .
  • the intermediate beater 31 bears against the impact direction 12 against a stop 33 .
  • the reversal point 29 is approximately in the middle between the first dead center 25 and the second dead center 26 of the exciter 16.
  • the transmission 20, in particular the eccentric wheel 21, is arranged in a housing 34 .
  • the housing 34 has an opening 35 in which a transmission-side portion 36 of the impact mechanism 6 is arranged flush.
  • the guide tube 13 is the transmission side open in the housing 34 , preferably with the cross section of the exciter 16.
  • the exciter 16 thus forms, at least a portion of the closure of the opening 35.
  • the moving exciter 16 periodically reduces the interior 37 of the housing 34th Das Housing 34 is hermetically sealed.
  • the pressure in the housing 34 changes with the beat frequency, which is typically in the range between 10 Hz and 100 Hz. The pressure is increased when the exciter 16 is advanced furthest into the housing 34 , ergo furthest from the impact point 28 (first dead center 25 ).
  • the closed between the housing 34 and exciter 16 volume is between 0.7 times and 5 times the swept by the exciter 16 volume.
  • the volume enclosed by the housing 34 and the exciter 16 may increase between 20% and 150% when the exciter 16 circulates. leaks are to be reduced so that they can not achieve a significant pressure equalization with the environment within a few seconds.
  • the guide tube 13 is provided with a first valve 38 which connects the pneumatic chamber 19 with the interior 37 of the housing 34 .
  • the first valve 38 preferably consists of a radial valve opening in the guide tube 13, which is run over by the racket 15 and thereby covered.
  • the racket 15 releases the valve opening of the valve 38 when the racket 15 is near the point of impact 28 .
  • the valve opening of the valve 38 is preferably less than 10% of the flight distance of the racket 15 away from the impact point 28 .
  • the first valve 38 is thus usually closed during the periodic movement.
  • the housing 34 may cover the first valve 38 along the working axis 11 such that the first valve 38 is located within the interior 37 .
  • a hose or other channel may lead from the first valve 38 to the interior 37 .
  • the guide tube 13 is provided with a second valve 39 , which connects the pneumatic chamber 19 with the interior 37 of the housing 34 .
  • the second valve 39 has a radial valve opening in the guide tube 13, which is run over by the exciter 16 and thereby covered.
  • the exciter 16 releases the valve opening when the exciter 16 is near the first dead center 25 , ie in the retracted from the impact point 28 position.
  • the valve opening of the valve 39 is preferably less than 10% of the lifting height 27 away from the first dead center 25 .
  • the housing 34 may cover the second valve 39 in the same way, or the second valve 39 is connected to the interior 37 by means of another channel.
  • the second valve 39 may include a check valve 40 , which prevents an outflow from the pneumatic chamber 19 into the interior 37 .
  • the first valve 38 and the second valve 39 are opened at different times and independently, the beater 15 controls only the first valve 38 and the exciter 16 controls only the second valve 39. Both valves 38, 39, however, bind the pneumatic chamber 19 to the same interior 37 . While the second valve 39 opens, the exciter 16 is near the first dead center 25. The pressure in the housing 34 is increased, at least higher than the pressure in the pneumatic chamber 19. From the interior space 37 , an amount of air flows into the pneumatic chamber 19th Fig. 5 schematically shows the air flow plotted on the y-axis plotted over the angular position of the eccentric wheel 21 as the x-axis. While the first valve 38 is opened, the racket 15 has almost its Final speed reached. The pressure in the pneumatic chamber 19 is still slightly higher than in the interior 37, the previously supplied amount of air flows out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Claims (5)

  1. Machine-outil manuelle (1) comportant :
    un porte-outil (2) destiné à recevoir un outil à buriner (4) sur un axe de travail (11),
    un moteur (5),
    un mécanisme de percussion (6) qui comporte un tube de guidage (13) coaxial à l'axe de travail (11), un percuteur (15) guidé sur l'axe de travail (11) qui percute l'outil (4) ou un percuteur intermédiaire (31) en un point de percussion (28), un excitateur (16) entraîné périodiquement entre un premier point mort (25) éloigné du point de percussion (28) et un second point mort (26) proche du point de percussion (28), et une chambre pneumatique (19) agencée entre le percuteur (15) et une face frontale (24) de l'excitateur (16) dirigée vers le percuteur (16) pour coupler le mouvement du percuteur (15) au mouvement périodique de l'excitateur (16),
    un boîtier (34) encapsulé de manière étanche à l'air, dont l'espace intérieur (37) est fermé par une face frontale (41) de l'excitateur (16) opposée au percuteur (15),
    un premier clapet (38) agencé près du point de percussion (28) et pouvant être fermé par le percuteur (15), lequel le premier clapet relie la chambre pneumatique (19) à l'espace intérieur (37), et
    un second clapet (39) agencé près du premier point mort (25) et pouvant être fermé par l'excitateur (16), lequel second clapet relie la chambre de pneumatique (19) à l'espace intérieur (37), caractérisée en ce que
    le premier clapet (38) n'est fermé que lorsque le percuteur (15) est déplacé à partir du point de percussion (28) de plus de 10 % de la distance (30) parcourue du point de percussion (28) à un point d'inversion (29) du percuteur (15), et en ce que
    le second clapet (39) n'est fermé par l'excitateur (16) que lorsque l'excitateur (16) est éloigné du premier point mort (25) de plus de 10 % de la hauteur de course (27) du premier point mort (25) au second point mort (26).
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce que le boîtier (34) contient au moins une partie d'un engrenage (20).
  3. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que le boîtier (34) comporte une ouverture (35) qui est recouverte par l'excitateur (16).
  4. Machine-outil manuelle selon l'une des revendications précédentes, caractérisée en ce que le premier clapet (38) est formé comme une ouverture de ventilation radiale dans le tube de guidage (13) et le second clapet (39) est formé comme une ouverture de ventilation radiale dans le tube de guidage (13).
  5. Machine-outil manuelle selon la revendication 4, caractérisée en ce que le premier clapet (38) et le second clapet (39) sont agencés à l'intérieur du boîtier (34).
EP14793129.9A 2013-11-11 2014-11-04 Machine-outil portative Active EP3068585B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14793129.9A EP3068585B1 (fr) 2013-11-11 2014-11-04 Machine-outil portative

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP20130192257 EP2871028A1 (fr) 2013-11-11 2013-11-11 Machine-outil manuelle
PCT/EP2014/073652 WO2015067590A1 (fr) 2013-11-11 2014-11-04 Machine-outil à main
EP14793129.9A EP3068585B1 (fr) 2013-11-11 2014-11-04 Machine-outil portative

Publications (2)

Publication Number Publication Date
EP3068585A1 EP3068585A1 (fr) 2016-09-21
EP3068585B1 true EP3068585B1 (fr) 2018-01-31

Family

ID=49596067

Family Applications (2)

Application Number Title Priority Date Filing Date
EP20130192257 Withdrawn EP2871028A1 (fr) 2013-11-11 2013-11-11 Machine-outil manuelle
EP14793129.9A Active EP3068585B1 (fr) 2013-11-11 2014-11-04 Machine-outil portative

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20130192257 Withdrawn EP2871028A1 (fr) 2013-11-11 2013-11-11 Machine-outil manuelle

Country Status (4)

Country Link
US (1) US20160271779A1 (fr)
EP (2) EP2871028A1 (fr)
CN (1) CN105722645A (fr)
WO (1) WO2015067590A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3181301A1 (fr) 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3181299A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3181300A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3181298A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil a percussion
EP3335837A1 (fr) * 2016-12-14 2018-06-20 HILTI Aktiengesellschaft Procédé de commande pour une machine-outil manuelle à percussion
CN107914189A (zh) * 2017-12-15 2018-04-17 义乌市晶凯机械设备有限公司 一种新型平整打磨一体机
CN110340852B (zh) * 2019-08-13 2024-02-27 油特机械工具（大连）有限公司 一种高精度长寿命充电式冲点枪

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2538896C3 (de) * 1975-09-02 1979-02-22 Bernhard Dr.Rer.Oec. Dipl.-Ing. 7260 Calw Bender Schlaggerät, insbesondere Bohrhammer
US4932479A (en) * 1988-05-05 1990-06-12 Vladimir Pyatov Vacuum-compression type percussion power tool with a pumping chamber
ZA908924B (en) * 1990-01-15 1991-08-28 Sulzer Ag A percussion device
DE10249139A1 (de) * 2002-10-22 2004-05-06 Robert Bosch Gmbh Luftpolsterschlagwerk
DE10332109B4 (de) * 2003-07-15 2009-01-15 Wacker Construction Equipment Ag Arbeitsgerät mit Handgriffabfederung
DE10358571A1 (de) * 2003-12-15 2005-07-07 Hilti Ag Schlagende Elektrohandwerkzeugmaschine
EP2130651B1 (fr) 2007-03-26 2014-11-26 Makita Corporation Outil à percussion
DE102009008190A1 (de) * 2009-01-30 2010-08-05 Hilti Aktiengesellschaft Pneumatisches Schlagwerk
DE102010029915A1 (de) * 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine und Steuerungsverfahren
DE102012206452A1 (de) * 2012-04-19 2013-10-24 Hilti Aktiengesellschaft Handwerkzeugmaschine und Steuerungsverfahren
DE102012206445A1 (de) * 2012-04-19 2013-10-24 Hilti Aktiengesellschaft Werkzeugmaschine
DE102012206451B4 (de) * 2012-04-19 2020-12-10 Hilti Aktiengesellschaft Handwerkzeugmaschine

Also Published As

Publication number Publication date
US20160271779A1 (en) 2016-09-22
EP2871028A1 (fr) 2015-05-13
WO2015067590A1 (fr) 2015-05-14
CN105722645A (zh) 2016-06-29
EP3068585A1 (fr) 2016-09-21

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