EP1795308A2 - Appareil à percussion - Google Patents

Appareil à percussion Download PDF

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Publication number
EP1795308A2
EP1795308A2 EP06124921A EP06124921A EP1795308A2 EP 1795308 A2 EP1795308 A2 EP 1795308A2 EP 06124921 A EP06124921 A EP 06124921A EP 06124921 A EP06124921 A EP 06124921A EP 1795308 A2 EP1795308 A2 EP 1795308A2
Authority
EP
European Patent Office
Prior art keywords
damping element
locking
hammer
tool holder
striking device
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Withdrawn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
EP06124921A
Other languages
German (de)
English (en)
Other versions
EP1795308A3 (fr
Inventor
Christian Koschel
Markus Hartmann
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 EP1795308A2 publication Critical patent/EP1795308A2/fr
Publication of EP1795308A3 publication Critical patent/EP1795308A3/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Withdrawn legal-status Critical Current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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber

Definitions

  • the invention relates to a hammer blower, in particular an electro-pneumatic drill and / or chisel hammer, with a motor arranged in a housing, which drives an output element and a striking mechanism. Furthermore, the hammer blower on a tool holder on which an actable by the impact mechanism along an axis tool can be fixed and which can be fixed via a releasable locking mechanism on the output element.
  • the locking mechanism has at least one locking body, via which a positive connection between a connecting part of the tool holder and the driven element can be produced in a locking position.
  • the locking body can also be moved in the radial direction to the axis into an unlocking position, in which the positive locking is released, so that the tool holder can be removed from the driven element.
  • an adjusting sleeve is provided, which supports the at least one locking body in the locking position against a radial displacement in a blocking position.
  • the adjusting sleeve is adjustable in a working direction of the hammer-striking device against a spring force in a release position in which the locking body can be brought into the unlocking position.
  • the tool holder can be removed in a particularly comfortable and tool-free manner of the driven element, for example, to replace it with a new or different tool holder.
  • a hand tool machine which has a sleeve-shaped output element, in which an anvil is guided and on which a feed can be fixed.
  • radially displaceable retaining elements are provided, via which an axial positive connection between a connecting part of the chuck and the driven element can be produced.
  • the holding elements are in this case supported by an adjusting sleeve in the locking position, which is pressed counter to a working direction by a spring to a snap ring. To that To release food from the driven element, the adjusting sleeve is displaced in the working direction against a force of the spring, so that the holding elements are displaced radially outward and thereby cancel the positive connection between the connecting part and the output element.
  • a disadvantage of the known device is that, during operation, in particular when empty beats, the striker strikes against an axial stop of the sleeve-shaped output element and a very large part of the impact energy is delivered via the connecting part and the snap ring held thereon to the adjusting sleeve. Often, in this case, the impact energy acting on the adjusting sleeve is sufficient to move it so far in the working direction that the retaining elements can be displaced into their unlocking position. This results in many cases an unintentional dropping of the feed from the hammer blower.
  • the present invention has for its object to avoid the disadvantages mentioned in a hammer blower and to prevent unwanted loosening of the tool holder.
  • the object is achieved in that in the attached state of the tool holder between the driven element and the connecting part, a damping element acting in the axial direction is provided.
  • a damping element acting in the axial direction is provided in this way.
  • the proportion of transmitted to the adjusting sleeve axially acting impact energy can be reduced so that even with empty blow of the striker on the connecting part of the tool holder, this can not give sufficient impulse to the adjusting sleeve to move it to the release position.
  • the adjusting sleeve is unintentionally removed from the blocking position, which in turn the locking bodies are permanently supported in the locking position.
  • the tool holder is securely held on the output element even in the case of clearances.
  • a damping element receptacle for fixing the damping element is formed on the output element.
  • the damping element receptacle is arranged on a side facing away from the impact mechanism side of an axial striker stop.
  • the damping element can be securely supported against the working direction be without this additional recording elements would have to be provided. Rather, an already existing part is used as the axial limit of the damping element recording with the striker stop.
  • the damping element has a radially protruding clamping element which is clamped in a terminal receiving the output element.
  • the damping element can be completely determined in a particularly simple manner on the output element.
  • the damping element in the unloaded state in the axial direction has a greater extent than an axial distance between a contact area of the connecting part and a support region facing the damping element receiving in the locked state of the tool holder.
  • the damping element is axially biased in the locked state and pushes the tool holder away from the driven element.
  • a good damping and on the other hand a particularly good definition of the tool holder relative to the driven element can be achieved.
  • a required for the radial mobility of the locking body game is canceled.
  • unnecessary noise and increased wear of the locking body or the elements that record this can be prevented as a result of the game.
  • damping element is annular. As a result, the installation of the damping element is substantially facilitated.
  • commercially available damping elements can be used in many cases, which reduces the manufacturing cost.
  • the damping element is formed from an elastomer, whereby a sufficient degradation of the impact energy between the driven element and the tool holder and thus a sufficient reduction of the acceleration of the adjusting sleeve can be achieved in the working direction.
  • Fig. 1 shows the front part of a hammer blower 2 in the form of a rotary hammer device, which has a motor 6 in a housing 4.
  • the motor 6 is used as shown schematically for driving an exciter 8 of a percussion mechanism 10 and for rotary drive of an output element 12.
  • the output element 12 is tubular and leads in a longitudinal bore 14 an anvil 16 of the impact mechanism 10, in turn of a through the exciter 8 driven bat 18 is acted upon.
  • a tool holder 20 On the output member 12 is a tool holder 20, which serves to receive a tool 22 in the form of a drill or Meisselbits, via a releasable locking mechanism 24 can be fixed. In operation, this causes the tool holder 20 to rotate together with the driven element 12 about a common axis A. At the same time, the striking mechanism 10 acts on the tool 22 held on the tool holder 20 in a working direction R parallel to the axis A.
  • the respective upper part relative to the axis A in FIGS. 1 and 2 shows the locking mechanism 24 in a locking position in which the tool holder 20 is locked to the driven element 12.
  • the respective lower part in FIGS. 1 and 2 shows an unlocking position in which the tool holder 20 can be removed in the working direction R from the hammer-striking device 2, as indicated.
  • the locking mechanism 24 on spherical locking body 26 which are held in radial bores 28 of a cup-shaped connecting part 30 of the tool holder 20 with respect to the axis A radially displaceable.
  • this connection part 30 a free end 32 of the output element 12 is arranged.
  • the displaceability of the locking body 26 is limited to the outside by an adjusting sleeve 34 with a recessed bearing ring 36.
  • the adjusting sleeve 34 is biased by a spring force F of a spring 38 in a blocking position in which it bears against a snap ring 39 which is held on the connecting part 30.
  • the locking bodies 26 are supported by the bearing ring 36 and protrude from an inner wall 40 of the connecting part 30.
  • a positive connection between the output element 12 and the connecting part 30, whereby the tool holder 20 is fixed to the output member 12 via the locking body 26 is formed.
  • the adjusting sleeve 34 can be moved by an operator, not shown, against the spring force F in the working direction R in a release position, which is shown in the lower part of Figs. 1 and 2.
  • a recess 44 of the adjusting sleeve 34 is now arranged at the axial height of the radial bores 28. This allows the locking bodies 26 a radial movement to the outside until the locking body 26 are moved completely out of the locking receptacles 42 out.
  • the positive connection of the connecting part 30 is lifted with the output member 12 via the locking body 26 and the tool holder 20 can, as shown, are removed in the working direction R of the output member 12 and thus from the hammer hammer 2.
  • a circumferential striker stop 48 is fixedly connected to the output element 12, which limits the axial movement of the striker 16 in the working direction R.
  • a support portion 50 which is arranged axially offset from an end face 52 of the driven element 12.
  • the striker 48 and the output member 12 form an annular damping element receptacle 54, in which a likewise annular damping element 56 is held in elastomer.
  • a radially outwardly directed rib-shaped clamping element 58 is formed on the damping element 56, which is pressed into a groove-shaped clamping receptacle 60 which is embedded in the inner surface 46 of the output element 12.
  • This damping element 56 is located in the locking position, as can be seen from the upper half of Fig. 2, on a the output member 12 facing application area 62 of the connecting part 30 at.
  • the damping element 56 as can be seen in particular from the lower half of Fig. 2 is an axial extent I, which is greater than an axial distance a between the application area 62 and the support portion 50 in the locked state of the tool holder 20, according to the upper part of Fig. 2.
  • the damping element 56 is biased in producing the locking position according to the upper part of Fig. 2 and pushes the connecting member 30 away from the Output element 12.
EP06124921A 2005-12-07 2006-11-28 Appareil à percussion Withdrawn EP1795308A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005000179A DE102005000179A1 (de) 2005-12-07 2005-12-07 Hammerschlaggerät

Publications (2)

Publication Number Publication Date
EP1795308A2 true EP1795308A2 (fr) 2007-06-13
EP1795308A3 EP1795308A3 (fr) 2010-03-03

Family

ID=37771094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06124921A Withdrawn EP1795308A3 (fr) 2005-12-07 2006-11-28 Appareil à percussion

Country Status (4)

Country Link
US (1) US7357194B2 (fr)
EP (1) EP1795308A3 (fr)
JP (1) JP2007152550A (fr)
DE (1) DE102005000179A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4898249B2 (ja) * 2006-03-09 2012-03-14 株式会社マキタ 作業工具
DE102006000395A1 (de) * 2006-08-07 2008-02-14 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
CN203092484U (zh) * 2013-02-22 2013-07-31 郭景辉 一种用于射钉枪的卸力装置
JP7236921B2 (ja) * 2019-04-18 2023-03-10 株式会社マキタ 打撃工具
US11826891B2 (en) * 2019-10-21 2023-11-28 Makita Corporation Power tool having hammer mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3443186A1 (de) * 1984-11-27 1986-05-28 Robert Bosch Gmbh, 7000 Stuttgart Futter fuer handwerkzeugmaschinen, insbesondere bohr- und/oder schlaghaemmer
DE10005910A1 (de) * 2000-02-10 2001-08-23 Bosch Gmbh Robert Handwerkzeugmaschine
WO2002024403A1 (fr) * 2000-09-22 2002-03-28 Robert Bosch Gmbh Machine-outil a main pourvue d'un porte-outil amovible

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3168324A (en) * 1963-02-15 1965-02-02 Ingersoll Rand Co Chuck
US3559753A (en) * 1969-05-21 1971-02-02 Ilmar Meri Percussion tool
SU1662832A1 (ru) * 1988-09-23 1991-07-15 Московское Научно-Производственное Объединение По Механизированному Строительному Инструменту И Отделочным Машинам Машина ударного действи
DE3924620A1 (de) * 1989-07-26 1991-01-31 Hilti Ag Pulverkraftbetriebenes bolzensetzgeraet
US5325929A (en) * 1991-07-09 1994-07-05 Bretec Oy Hydraulic impact hammer
SE469970B (sv) * 1992-06-15 1993-10-18 Uniroc Grinding Ab Vibrationsdämpande slipkopp för slipning av hårdmetallstift hos stiftborrkronor och hållare för en sådan slipkopp
DE19604282A1 (de) * 1996-02-07 1997-08-14 Bosch Gmbh Robert Werkzeughalter mit Aufnahme für verschiedene Werkzeugsysteme
DE19638341A1 (de) * 1996-09-19 1998-03-26 Wuerth Adolf Gmbh & Co Kg Bolzenschubgerät und Feder dafür
KR200207572Y1 (ko) * 1998-12-04 2001-01-15 이원해 유압식 착암기의 방음 방진 장치
GB9910599D0 (en) * 1999-05-08 1999-07-07 Black & Decker Inc Rotary hammer
DE19933972A1 (de) * 1999-07-20 2001-01-25 Bosch Gmbh Robert Bohr- oder Schlaghammer
US6510904B1 (en) * 2000-05-26 2003-01-28 Nippon Pneumatic Mfg. Co., Ltd. Protected tool bushing for an impact hammer
US6705409B2 (en) * 2001-03-22 2004-03-16 Chicago Pneumatic Tool Company Reciprocating tool having a piston retaining system
WO2003024671A2 (fr) * 2001-09-17 2003-03-27 Milwaukee Electric Tool Corporation Marteau rotatif
GB2401570B (en) * 2003-05-12 2006-07-05 Black & Decker Inc Spindle assembly for hammer drill
US7131563B2 (en) * 2005-01-28 2006-11-07 De Poan Pneumatic Corp. Nail driver bumper

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3443186A1 (de) * 1984-11-27 1986-05-28 Robert Bosch Gmbh, 7000 Stuttgart Futter fuer handwerkzeugmaschinen, insbesondere bohr- und/oder schlaghaemmer
DE10005910A1 (de) * 2000-02-10 2001-08-23 Bosch Gmbh Robert Handwerkzeugmaschine
WO2002024403A1 (fr) * 2000-09-22 2002-03-28 Robert Bosch Gmbh Machine-outil a main pourvue d'un porte-outil amovible

Also Published As

Publication number Publication date
EP1795308A3 (fr) 2010-03-03
US7357194B2 (en) 2008-04-15
JP2007152550A (ja) 2007-06-21
US20070125564A1 (en) 2007-06-07
DE102005000179A1 (de) 2007-06-14

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