EP1955823A1 - Machine-outil manuelle dotée d'une sonnette pneumatique - Google Patents

Machine-outil manuelle dotée d'une sonnette pneumatique Download PDF

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Publication number
EP1955823A1
EP1955823A1 EP08101090A EP08101090A EP1955823A1 EP 1955823 A1 EP1955823 A1 EP 1955823A1 EP 08101090 A EP08101090 A EP 08101090A EP 08101090 A EP08101090 A EP 08101090A EP 1955823 A1 EP1955823 A1 EP 1955823A1
Authority
EP
European Patent Office
Prior art keywords
hand tool
striker
tool according
guide tube
valve
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
EP08101090A
Other languages
German (de)
English (en)
Other versions
EP1955823B1 (fr
Inventor
Markus Hartmann
Stefan Dorner
Peter Sternberger
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 EP1955823A1 publication Critical patent/EP1955823A1/fr
Application granted granted Critical
Publication of EP1955823B1 publication Critical patent/EP1955823B1/fr
Active legal-status Critical Current
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
    • B25D11/005—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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0015—Anvils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—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
    • B25D2250/035—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
    • B25D2250/131—Idling mode of tools

Definitions

  • the invention relates to a hand tool with pneumatic percussion referred to in the preamble of claim 1.
  • Such hand tool machines are z. B. formed as a chisel or combi hammer.
  • a hand-held electrically operated drilling and / or percussion hammer which has arranged in a device housing percussion, which is operable by a motor.
  • the hammer mechanism has a guided in a guide tube exciter element, such as an excitation piston, which is reciprocally movable by means of a connecting rod actuated by the motor.
  • the excitation element drives via an air cushion or an air spring also guided in the guide tube percussion piston, which exerts a striker on a front recorded in a tool holder tool.
  • the striker is cup-shaped at its end facing away from the tool and takes the percussion piston partially in his pot room.
  • a seal between the pot and the guide tube seals the hammer mechanism against grease leakage to the outside.
  • the air spring is controlled via an externally displaceable on the guide tube guided sleeve can be opened and closed via the vent holes in the guide tube, wherein the sleeve is indirectly controlled by the striker.
  • the present invention has for its object to provide a hand tool that avoids the disadvantages mentioned and allows easy control of the air spring.
  • the striker forms a shut-off of a valve controlling the air spring, which is the simplest design solution of a direct control of the air spring on the striker.
  • the bonnet is cup-shaped and has a pot portion, on which a valve portion is formed as a shut-off.
  • the length can be reduced despite high head diameter and at the same time the control of the air spring on the pot portion of the striker are realized.
  • a first seal of the valve is provided between the guide tube and the valve section.
  • the seal is a between the excitation element, such.
  • the z. B. are arranged in the guide tube.
  • the guide tube has an exciter section, in which the excitation element is guided, with a first inner diameter and an anvil section adjoining the exciter section, which accommodates the pot section of the striker, with a second inner diameter.
  • the first seal is arranged on the inside of the striker section of the guide tube near the transition to the exciter section.
  • a turning on of the air spring is achieved only with almost completely up to the stop or transition to the exciter section retracted striker and thus when pressed on a workpiece hand tool.
  • a weaker impact performance is made possible with weaker pressing of the hand tool to a workpiece, since the striker as shut-off of the valve this opens only temporarily or even partially.
  • the pot portion has a pot inside, in which the percussion piston is completely absorbable, or whose axial length is at least as large as the axial length of the percussion piston.
  • the pot chamber has a diameter which corresponds to the first inner diameter of the exciter section, whereby the percussion piston during its oscillating stroke movement during operation of the impact mechanism with the air spring switched between the pot and the exciter section of the guide tube can move back and forth.
  • the striker has an axially extending elongate extension on which the annularly shaped percussion piston is guided axially displaceable and forms at its end facing the excitation element a valve portion as a shut-off, with a vent enclosing annular part of the Excitation element cooperates.
  • a first seal of the valve between the valve portion of the striker and the annular portion of the excitation element is provided.
  • About the seal lying between the exciter element and the percussion piston space for switching on the air spring is sealed against the arranged in the annular part of the exciter element ventilation opening of the valve.
  • the first seal is arranged radially inward on the annular part.
  • FIG. 1 is a designed as a rotating and hammering combi hammer hand tool 10 reproduced, which has a housing 11 in which a on a can be arranged in a tool holder 14 tool 15 striking mechanism 20, a transmission 13 and a motor 12 are arranged.
  • the impact mechanism 20 is coupled via an output shaft 16 to the transmission 13, which translates a rotational movement of the motor 12.
  • the striking mechanism 20 has a guide tube 21, in which a exciter element 22 designed as an exciter piston is guided to be moved back and forth.
  • the guide tube 21 may be designed to simplify the Monday two or more parts.
  • the excitation element 22 is connected to generate a lifting movement during operation of the power tool 10 via a pivotally mounted on this connecting rod 29 with an eccentric 17 on the output shaft 16 of the transmission 13.
  • a cup-shaped stopper 24 is further mounted axially displaceable, in the pot chamber 34, a percussion piston 23 is guided axially movable.
  • the percussion piston 23 and the pot chamber 34 of the striker 24 are dimensioned so that the percussion piston 23 can be completely absorbed in the pot chamber 34, as in Fig. 2 you can see.
  • the striker 24 has a percussion piston 23 facing away from the impact end 30, via which it can act on the plugged into the tool holder 14 tool 15 striking.
  • an air spring 25 is switched on and switched off.
  • the striker 24 form a valve 26 remote from the striking end 30 and the guide tube 21 in the region of a first seal 27 arranged between the guide tube 21 and the valve section 36, wherein the striker 24 with its valve section 36 as a shut-off of the valve 26th acts.
  • ventilation openings 35 through which air can escape from the space between the excitation element 22 and the percussion piston 23 in the space outside the guide tube 21 when the valve is open (see. Fig. 3 ).
  • the diameter D T of the pot chamber 34 corresponds to the inner diameter D I1 of an exciter section 21a of the guide tube 21 in which the exciter element 22 is located, so that the percussion piston 23 in the operation of the percussion mechanism 20 at active or switched-air spring 25 can move into the exciter section 21a of the guide tube 21.
  • a the exciter section 21 a averted striker section 21 b of the guide tube 21 has a larger inner diameter D I2 than the exciter section 21 a, so that the pot portion 39 of the striker 24 in the guide tube 21 while maintaining the condition that the diameter D T of the pot chamber 34 equal the inner diameter D I1 , can be recorded.
  • At least one circumferential second seal 28 is arranged on the percussion piston 23 and serves for sealing against the inner surface of the pot portion 39 of the striker 24 or against the inner surface of the exciter portion 21a of the guide tube 21.
  • the excitation element 22 also has at least one annular third seal 37, which seals it against the inner surface of the exciter section 21a of the guide tube 21.
  • second vent holes 32 are mounted in the end portion of the pot portion 39 facing the striking end 30, which communicate with first ventilation holes 31 in the guide tube 21.
  • Fig. 2 is the hand tool 10 off Fig. 1 in operation with the arranged in the tool holder 14 tool 15 to a workpiece (not darg Hor) pressed.
  • the striker 24 is in its maximum position retracted far into the guide tube 21 in the direction of the exciter element 22.
  • the valve 26 is closed because the valve portion 36 of the striker 24 sealingly abuts the first seal 27, so that the space between the excitation element 22 and the percussion piston 23 does not communicate with the ventilation openings 35.
  • the air spring 25 is active or turned on and the striking mechanism 20 operates normally.
  • Fig. 3 is the hand tool 10 off Fig. 1 not pressed against a workpiece during operation with the tool 15 arranged in the tool holder 14.
  • the striker 24 is in its tool 15 facing the end position.
  • the valve 26 is opened because the valve portion 36 of the striker 24 has moved away from the first seal 27, so that the space between the excitation element 22 and the percussion piston 23 communicates with the ventilation openings 35.
  • the air spring 25 between the excitation element 22 and the percussion piston 23 is inactive or switched off.
  • the striking mechanism 20 works in the empty space, since the percussion piston 23 can no longer be sucked in and no longer exerts blows on the tool.
  • Fig. 4 is a further embodiment of an inventive impact mechanism 20 of a hand tool 10 ( Fig. 1 ).
  • the impact mechanism 20 in turn has a guide tube 21, in which a excitation element 22 designed as an excitation piston is guided to be movable back and forth.
  • the excitation element 22 is connected to generate a lifting movement during operation of the power tool 10 via a pivotally mounted on this connecting rod 29 with an eccentric 17 on the output shaft 16 of the transmission 13.
  • a striker 24 is mounted axially displaceable, which has an elongated rod-shaped extension 40 which forms at its end portion facing the exciter element 22 designed as a shut-off valve portion 36 of a valve 26.
  • the percussion piston 23 is annular and is displaceable with a second annular seal 28 on the cylindrical surface of the extension 40 at.
  • a fourth circumferential seal 38 is arranged, which seals the percussion piston 23 against the inner wall of the guide tube 21.
  • the exciter element 22 has an annular part 22a, which has an inner annular first seal 27, and a radially outer third seal 37th
  • the excitation element 22 with its annular opening, which acts as a ventilation opening 35 and which cooperates with the valve portion 36 of the striker 24 , as well as the first seal 27 are also part of the valve 26th
  • FIG. 4 the anvil 24 is shown in a first position (solid lines), in which it has retracted maximally far into the guide tube 21 in the direction of the exciter element 22, since the handheld power tool 10 (FIG. Fig. 1 ) with the tool 15 to a workpiece (not shown) is pressed.
  • the valve 26 is closed because the valve portion 36 of the striker 24 sealingly abuts the first seal 27 in the vent 35 in the excitation element 22 and closes it.
  • the air spring 25 between the percussion piston 23 and the excitation element 22 is active or turned on and the striking mechanism 20 operates normally.
  • FIG. 4 the anvil 24 is also shown in its tool receiving end position (dashed lines), which it assumes when the hand tool 10 ( Fig. 1 ) is not pressed against a workpiece during operation with the tool.
  • the valve 26 is opened because the valve portion 36 of the striker 24 is moved away from the first seal 27 and the ventilation opening 35 in the excitation element 22 so that the space between the excitation element 22 and the percussion piston 23 can communicate with the ventilation opening 35.
  • the air spring 25 between the excitation element 22 and the percussion piston 23 is inactive or switched off.
  • the Schlagtechnik 20 works in the Blank, since the percussion piston 23 can no longer be sucked in and exerts no impact on the tool in the tool holder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP08101090.2A 2007-02-08 2008-01-30 Machine-outil manuelle dotée d'un mécanisme à percussion pneumatique Active EP1955823B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007000081A DE102007000081A1 (de) 2007-02-08 2007-02-08 Handwerkzeugmaschine mit pneumatischem Schlagwerk

Publications (2)

Publication Number Publication Date
EP1955823A1 true EP1955823A1 (fr) 2008-08-13
EP1955823B1 EP1955823B1 (fr) 2013-07-17

Family

ID=39327361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08101090.2A Active EP1955823B1 (fr) 2007-02-08 2008-01-30 Machine-outil manuelle dotée d'un mécanisme à percussion pneumatique

Country Status (5)

Country Link
US (1) US7628221B2 (fr)
EP (1) EP1955823B1 (fr)
JP (1) JP5202010B2 (fr)
CN (1) CN101239459B (fr)
DE (1) DE102007000081A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2473320A1 (fr) * 2009-09-01 2012-07-11 Robert Bosch GmbH Dispositif à marteau perforateur et/ou à marteau burineur
EP2684646A1 (fr) * 2012-07-12 2014-01-15 HILTI Aktiengesellschaft Machine-outil manuelle
EP3670097A1 (fr) * 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Machine-outil portative
CN115398130A (zh) * 2020-04-21 2022-11-25 喜利得股份公司 电动气动冲击机构

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE530329C2 (sv) * 2006-10-13 2008-05-06 Atlas Copco Tools Ab Slående mutterdragare med smord slagmekanism
DE102009045656A1 (de) * 2009-10-14 2011-04-21 Robert Bosch Gmbh Werkzeugvorrichtung
DE102010006152B4 (de) * 2010-01-29 2014-07-03 Aeg Electric Tools Gmbh Handgeführter Bohrhammer
DE102010029915A1 (de) 2010-06-10 2011-12-15 Hilti Aktiengesellschaft Werkzeugmaschine und Steuerungsverfahren
DE102011084465A1 (de) * 2011-10-13 2013-04-18 Robert Bosch Gmbh Flugkolben
DE102012206445A1 (de) * 2012-04-19 2013-10-24 Hilti Aktiengesellschaft Werkzeugmaschine
DE102012210097A1 (de) * 2012-06-15 2013-12-19 Hilti Aktiengesellschaft Steuerungsverfahren
EP2857149A1 (fr) * 2013-10-03 2015-04-08 HILTI Aktiengesellschaft Machine-outil manuelle
KR101412092B1 (ko) * 2013-11-28 2014-07-02 주식회사 엔와이테크 저소음형 유압 타격 장치
EP3034242A1 (fr) * 2014-12-18 2016-06-22 HILTI Aktiengesellschaft Machine-outil manuelle
EP3117962A1 (fr) * 2015-07-17 2017-01-18 HILTI Aktiengesellschaft Machine-outil portative
EP3181300A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
CN113561342B (zh) * 2021-09-26 2021-11-26 江苏大艺科技股份有限公司 用于电动工具的气压自平衡气缸结构

Citations (4)

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DE2641070A1 (de) * 1976-09-11 1978-03-16 Bosch Gmbh Robert Motorisch angetriebener schlaghammer mit luftfederung
EP0426633A2 (fr) * 1989-10-28 1991-05-08 Atlas Copco Berema Aktiebolag Machine portative à percussion
DE4310835A1 (de) 1993-04-02 1994-10-06 Bosch Gmbh Robert Bohr- und/oder Schlaghammer
GB2425503A (en) 2005-04-28 2006-11-01 Bosch Gmbh Robert Hand machine tool striking mechanism unit

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US4102410A (en) * 1975-03-19 1978-07-25 Ross Frederick W Resilient work-coupled impact device
DE2844110A1 (de) * 1978-10-10 1980-04-24 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere meisselhammer
DE3304916A1 (de) * 1983-02-12 1984-08-16 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE3504650C2 (de) * 1985-02-12 1994-01-20 Bosch Gmbh Robert Bohrhammer mit Verstärkung der Betätigungskraft für die Kupplung des Schlagantriebes
US4712625A (en) * 1986-01-14 1987-12-15 Willy Kress Drilling and percussion hammer
DE3633675A1 (de) * 1986-10-03 1988-04-14 Hilti Ag Bohrhammer mit schlagwerk
US5203417A (en) * 1991-01-14 1993-04-20 Glendo Corporation Handheld impact power tool
US5727639A (en) * 1996-03-11 1998-03-17 Lee Matherne Pile driving hammer improvement
DE19714287A1 (de) * 1997-04-07 1998-10-08 Hilti Ag Bohr- und/oder Meisselgerät
DE19714288A1 (de) * 1997-04-07 1998-10-08 Hilti Ag Bohr- und/oder Meisselgerät
GB9909987D0 (en) * 1999-04-30 1999-06-30 Black & Decker Inc Rotary hammer
DE19929183B4 (de) * 1999-06-25 2004-07-29 Wacker Construction Equipment Ag Luftfederschlagwerk mit Hohl-Schlagkolben mit Leerlauföffnung
US6155472A (en) * 2000-02-16 2000-12-05 Profilages Cresswell Inc. Impact blow actuated pneumatic fastener driving tool
GB0008465D0 (en) * 2000-04-07 2000-05-24 Black & Decker Inc Rotary hammer mode change mechanism
DE10033362A1 (de) * 2000-07-08 2002-01-17 Hilti Ag Elektrohandwerkzeug mit Leerschlagabschaltung
DE10103141A1 (de) * 2001-01-24 2002-07-25 Hilti Ag Elektrohandwerkzeuggerät mit Leerschlagabschaltung
US6863134B2 (en) * 2003-03-07 2005-03-08 Ingersoll-Rand Company Rotary tool
DE102005019196A1 (de) * 2005-04-25 2006-10-26 Hilti Ag Handwerkzeuggerät mit Taumeleinrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2641070A1 (de) * 1976-09-11 1978-03-16 Bosch Gmbh Robert Motorisch angetriebener schlaghammer mit luftfederung
EP0426633A2 (fr) * 1989-10-28 1991-05-08 Atlas Copco Berema Aktiebolag Machine portative à percussion
DE4310835A1 (de) 1993-04-02 1994-10-06 Bosch Gmbh Robert Bohr- und/oder Schlaghammer
GB2425503A (en) 2005-04-28 2006-11-01 Bosch Gmbh Robert Hand machine tool striking mechanism unit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2473320A1 (fr) * 2009-09-01 2012-07-11 Robert Bosch GmbH Dispositif à marteau perforateur et/ou à marteau burineur
EP2684646A1 (fr) * 2012-07-12 2014-01-15 HILTI Aktiengesellschaft Machine-outil manuelle
CN103538032A (zh) * 2012-07-12 2014-01-29 喜利得股份公司 手持式工具机
US10058987B2 (en) 2012-07-12 2018-08-28 Hilti Aktiengesellschaft Hand-held power tool
EP3670097A1 (fr) * 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Machine-outil portative
WO2020126924A1 (fr) 2018-12-21 2020-06-25 Hilti Aktiengesellschaft Machine-outil portative
CN113015600A (zh) * 2018-12-21 2021-06-22 喜利得股份公司 便携式动力工具
US12479077B2 (en) 2018-12-21 2025-11-25 Hilti Aktiengesellschaft Portable power tool
CN115398130A (zh) * 2020-04-21 2022-11-25 喜利得股份公司 电动气动冲击机构

Also Published As

Publication number Publication date
CN101239459B (zh) 2011-07-06
EP1955823B1 (fr) 2013-07-17
CN101239459A (zh) 2008-08-13
US20080202782A1 (en) 2008-08-28
DE102007000081A1 (de) 2008-08-21
JP2008194817A (ja) 2008-08-28
JP5202010B2 (ja) 2013-06-05
US7628221B2 (en) 2009-12-08

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