EP1967329A2 - Machine-outil manuelle dotée d'un mécanisme de frappe pneumatique - Google Patents

Machine-outil manuelle dotée d'un mécanisme de frappe pneumatique Download PDF

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Publication number
EP1967329A2
EP1967329A2 EP08102009A EP08102009A EP1967329A2 EP 1967329 A2 EP1967329 A2 EP 1967329A2 EP 08102009 A EP08102009 A EP 08102009A EP 08102009 A EP08102009 A EP 08102009A EP 1967329 A2 EP1967329 A2 EP 1967329A2
Authority
EP
European Patent Office
Prior art keywords
hand tool
striker
axially
ring
tool according
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
EP08102009A
Other languages
German (de)
English (en)
Other versions
EP1967329A3 (fr
EP1967329B1 (fr
Inventor
Alexander Löffler
Reinhard Schulz
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 EP1967329A2 publication Critical patent/EP1967329A2/fr
Publication of EP1967329A3 publication Critical patent/EP1967329A3/fr
Application granted granted Critical
Publication of EP1967329B1 publication Critical patent/EP1967329B1/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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • 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
    • 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
    • B25D2250/345—Use of o-rings
    • 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
    • B25D2250/391—Use of weights; Weight properties of the tool

Definitions

  • the invention refers to an at least partially striking hand tool with a pneumatic impact mechanism such as a chisel hammer or a hammer drill.
  • a pneumatic percussion mechanism has a guided in a guide tube and driven by an air spring air piston, which usually strikes a limited axially movable striker, which hits even the front end of a limited axially movable tool.
  • W003024671 has a beating hand tool with a pneumatic percussion on a damping element, wherein the flying piston has an axially offset by a tapered outer cone, which penetrates rubbing into a radially narrower steel ring of the damping element and thereby at idle over a long axial pre-damping a large part of the kinetic energy of the flying piston dissipated in the viscoelastic damping element.
  • the striker forms a second, axially spaced outer radial collar, which surrounds the elastomeric damping ring with an inner radial collar Sparks happen and thereby viscoelastic expands, which additionally reduces kinetic energy.
  • DE4400779 is an anvil in axial play freely movable within a radially outwardly elastically biased, axially frictionally movable in the guide tube sliding sleeve made of metal, which forms two frontal mecanicalfasen, each associated with a participatedradialfase a participatradialbundes the striker.
  • the sliding sleeve is radially expanded, whereby the friction force of the sliding sleeve increases and is dissipated correspondingly more kinetic energy.
  • the rest of the kinetic energy is dissipated with a visco-elastic damping ring, which is hit by the sliding sleeve together with the striker.
  • the object of the invention is a robust, durable implementation for damping the blank. Another aspect is the shortening of the Leerschlagweges the striker and thus the overall length.
  • an at least partially striking hand-held power tool with a pneumatic percussion on a driven by an air spring piston which strikes a limited guided in a guide tube and two axial stops axially movable striker, which forms a suddenlyradialbund, axially from both sides of a coaxially arranged outside shock ring each with an inner radial edge radially includes and the outer radial collar axially limited freely movable, wherein the outer diameter of the shock ring is smaller than the leading inner diameter of the guide tube and the mass ratio of the shock ring to the striker is at least 0.25.
  • the striker encounters the empty shot with a topper speed by the power surge on the Jardinradialbund on the tool-side inner radial edge of the previously stationary (with respect to the power tool) shock ring, whereby the striker braked and the shock ring is accelerated until it again strikes with its machine-side réelleradialflanke on the outer radial collar and emits kinetic energy to the striker again.
  • the striker braked and the shock ring is accelerated until it again strikes with its machine-side réelleradialflanke on the outer radial collar and emits kinetic energy to the striker again.
  • a not insignificant loss of energy during the leading back reflection power surge occurs. This interplay is continued over a large number of momentum, until in the (temporal) border crossing of the shock ring has the same final speed as the striker and thereby largely come to rest by the energy losses.
  • the thrust ring is formed tangentially in two parts, more advantageously of two half-shells, which are firmly connected to each other after assembly (eg. Welded), whereby the shock ring around the Indeedradialbund of the striker is assembled around.
  • the tangentially formed two-part thrust ring is radially outwardly of a circumferentially closed mounting sleeve includes, which is further advantageously radially inwardly resiliently biased and provided with internal thread, whereby a positive and reibkraftschlüssige mounting of the tangentially formed two-piece thrust ring with external thread is possible.
  • an axially limited freely movable axial Bundspiel herein the Summaryradialbunds to the shock ring in the range between 1 mm and 5 mm, further advantageously at 2 mm, which during the stable impact operation, in which the flying piston at the operating point strikes the striker and this virtually motionless on the Front end of the limited axially movable tool hits, the striker is offset infinitely only within the axial collar length, causing no force surges to the shock ring and consequently takes place in this loss-free stable impact operation.
  • an axially limited freely movable axial Ringpielin of the shock ring to the ring stops in the guide tube in the range between 10 mm and 20 mm, more advantageously at 15 mm, which on the one hand at idle multiple energy dissipating reflections of the shock ring to the striker done before the shock ring itself on an annular stop in the guide tube impinges, on the other hand, the Leerschlagweg of the striker is less than in a comparable implementation without shock ring.
  • the outer radial collar is arranged on a machine side radially tapered Axialhals the striker, whereby the outer diameter of the Jardinradialbundes and thus also of the shock ring is less executable (as in a striker without axial neck), whereby the space occupied by the Leerschlagdämpfung space is limited.
  • the axial abutment surfaces formed on the outer radial collar and the counter abutment surfaces formed on the two inner radial edges are advantageously chamfered in the same axial direction, further advantageously with a radial chamfer angle in the range between 30 ° and 80 °, whereby a radial expansion of the shock ring takes place during the axial shock of the axially oblique chamfer , which dissipates a significant part of the impact energy in ring vibrations and heat by the associated micro friction.
  • FIG. 1 has a rotating and striking a tool 7 driving hand tool 1 a pneumatic percussion 2 with a coupled by an air spring 3 with an exciter piston 4 flying piston 5, which strikes in the illustrated striking position on a guided in a guide tube 6 striker 8.
  • Fig. 2 To Fig. 2 is the axial freedom of movement of the striker 8 limited by two in the guide tube 6 (the striker 8) angeodnete axial stops 9a, 9b.
  • the striker 8 also forms an outer radial collar 11 on a machine side radially tapered Axialhals 10, the axially from both sides with a mecanicradialflanke 14 radially comprises a coaxial outer thrust ring 12 and the réelleradialbund 11 axially limited free is movable, wherein the mass ratio of the shock ring 12 to the striker 8 is exactly 0.25.
  • the axial abutment surfaces 15a formed on the outer radial collar 11 as well as the counter abutment surfaces 15b formed on the two inner radial flanks 14 are axially chamfered in terms of their amount equal to a radial chamfer angle [alpha] of 30 °.
  • two axially double-sided ring stops 16a, 16b are provided for the shock ring 12, wherein the machine-side ring stop 16b is identical to the machine-side axial stop 9b and is made of viscoelastic material.
  • the tangentially formed from two half-shells 17a, 17b butt ring 12 with external thread 18 was placed around the Jardinradialbund 11 during assembly and surrounded by a circumferentially closed mounting sleeve 19, which is resiliently biased radially inward and provided with internal thread 20.
  • the outer diameter of the shock ring 12 (including mounting sleeve 19) is slightly smaller than the (this virtually frictionless leading) inner diameter of the guide tube 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP08102009.1A 2007-03-07 2008-02-26 Machine-outil manuelle dotée d'un mécanisme de frappe pneumatique Active EP1967329B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007000131A DE102007000131A1 (de) 2007-03-07 2007-03-07 Handwerkzeugmaschine mit pneumatischem Schlagwerk

Publications (3)

Publication Number Publication Date
EP1967329A2 true EP1967329A2 (fr) 2008-09-10
EP1967329A3 EP1967329A3 (fr) 2012-04-25
EP1967329B1 EP1967329B1 (fr) 2013-04-24

Family

ID=39493342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08102009.1A Active EP1967329B1 (fr) 2007-03-07 2008-02-26 Machine-outil manuelle dotée d'un mécanisme de frappe pneumatique

Country Status (3)

Country Link
US (1) US7950471B2 (fr)
EP (1) EP1967329B1 (fr)
DE (1) DE102007000131A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006060320A1 (de) * 2006-12-20 2008-06-26 Robert Bosch Gmbh Schlagwerk für eine Handwerkzeugmaschine
US9216502B2 (en) 2008-04-03 2015-12-22 Black & Decker Inc. Multi-stranded return spring for fastening tool
US8534527B2 (en) * 2008-04-03 2013-09-17 Black & Decker Inc. Cordless framing nailer
US8636081B2 (en) 2011-12-15 2014-01-28 Milwaukee Electric Tool Corporation Rotary hammer
DE102010030026A1 (de) * 2010-06-14 2012-02-23 Robert Bosch Gmbh Schlagwerk
DE102010030127A1 (de) * 2010-06-15 2011-12-15 Hilti Aktiengesellschaft Eintreibvorrichtung
DE102010044011A1 (de) * 2010-11-16 2012-05-16 Hilti Aktiengesellschaft Handwerkzeugmaschine
DE102012103604A1 (de) * 2012-04-24 2013-10-24 C. & E. Fein Gmbh Handführbare Werkzeugmaschine mit Gehäuse
EP3034242A1 (fr) * 2014-12-18 2016-06-22 HILTI Aktiengesellschaft Machine-outil manuelle
WO2019079560A1 (fr) 2017-10-20 2019-04-25 Milwaukee Electric Tool Corporation Outil à percussion
CN214723936U (zh) 2018-01-26 2021-11-16 米沃奇电动工具公司 冲击工具
EP3822036A1 (fr) * 2019-11-12 2021-05-19 Hilti Aktiengesellschaft Agencement de mécanisme de frappe
EP3822030A1 (fr) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Marteau perforateur et/ou burin avec agencement de mécanisme de percussion
EP3822037A1 (fr) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Agencement de mécanisme de percussion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910398A1 (de) 1989-03-31 1990-10-04 Bosch Gmbh Robert Handwerkzeugmaschine mit steckfutter
DE4400779A1 (de) 1994-01-13 1995-07-20 Duss Maschf Elektropneumatischer Schlag- oder Drehschlaghammer
EP1238759A1 (fr) 2001-03-07 2002-09-11 Black & Decker Inc. Marteau
WO2003024671A2 (fr) 2001-09-17 2003-03-27 Milwaukee Electric Tool Corporation Marteau rotatif

Family Cites Families (18)

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US2308143A (en) * 1941-12-03 1943-01-12 Chicago Pneumatic Tool Co Snubber for tamper bars
US2533487A (en) * 1946-08-15 1950-12-12 Chicago Pneumatic Tool Co Gas hammer
US2685274A (en) * 1951-04-12 1954-08-03 Phyllis E Liddicoat Pneumatic tool
US3028840A (en) * 1960-06-15 1962-04-10 Leaveil Charles Vibrationless percussive tool
US3179185A (en) * 1962-06-14 1965-04-20 Chicago Pneumatic Tool Co Demolition tool with shock attenuating means
US3255832A (en) * 1962-11-27 1966-06-14 Leavell Charles Vibrationless percussive tool
US3168324A (en) * 1963-02-15 1965-02-02 Ingersoll Rand Co Chuck
GB1584356A (en) * 1976-11-02 1981-02-11 Hollandsche Betongroep Nv Pile driving apparatus
US4113035A (en) * 1977-04-21 1978-09-12 Licentia Patent-Verwaltungs-G.M.B.H. Hammer drill with drive and percussion elements accommodated in a cylinder
US4213518A (en) * 1978-08-04 1980-07-22 United Technologies Corporation Fixed position pendular-type vibration absorber with linearization at fixed or variable frequencies
DE19810088C1 (de) * 1998-03-10 1999-08-26 Bosch Gmbh Robert Bohr- und/oder Schlaghammer mit in Abhängigkeit von der Einstecktiefe eines Werkzeuges aktivierbarem Schlagwerk
JP4215399B2 (ja) * 1998-09-02 2009-01-28 東海ゴム工業株式会社 自動車用制振装置
JP3794178B2 (ja) * 1998-10-23 2006-07-05 日立工機株式会社 打撃工具
DE19918555C1 (de) * 1999-04-23 2001-06-07 Oskar Bschorr Stabilisierung von Walzanlagen gegenüber selbsterregten Ratterschwingungen
DE19933972A1 (de) * 1999-07-20 2001-01-25 Bosch Gmbh Robert Bohr- oder Schlaghammer
JP4016772B2 (ja) * 2001-11-16 2007-12-05 日立工機株式会社 ハンマドリル
GB2401570B (en) * 2003-05-12 2006-07-05 Black & Decker Inc Spindle assembly for hammer drill
DE102004044499B4 (de) * 2004-09-15 2021-02-18 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3910398A1 (de) 1989-03-31 1990-10-04 Bosch Gmbh Robert Handwerkzeugmaschine mit steckfutter
DE4400779A1 (de) 1994-01-13 1995-07-20 Duss Maschf Elektropneumatischer Schlag- oder Drehschlaghammer
EP1238759A1 (fr) 2001-03-07 2002-09-11 Black & Decker Inc. Marteau
WO2003024671A2 (fr) 2001-09-17 2003-03-27 Milwaukee Electric Tool Corporation Marteau rotatif

Also Published As

Publication number Publication date
EP1967329A3 (fr) 2012-04-25
EP1967329B1 (fr) 2013-04-24
DE102007000131A1 (de) 2008-09-11
US7950471B2 (en) 2011-05-31
US20080217040A1 (en) 2008-09-11

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