EP1340596B1 - Mécanisme de percussion à ressort pneumatique - Google Patents

Mécanisme de percussion à ressort pneumatique Download PDF

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Publication number
EP1340596B1
EP1340596B1 EP03405098A EP03405098A EP1340596B1 EP 1340596 B1 EP1340596 B1 EP 1340596B1 EP 03405098 A EP03405098 A EP 03405098A EP 03405098 A EP03405098 A EP 03405098A EP 1340596 B1 EP1340596 B1 EP 1340596B1
Authority
EP
European Patent Office
Prior art keywords
dolly
free piston
pot
radial clearance
striker
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.)
Expired - Lifetime
Application number
EP03405098A
Other languages
German (de)
English (en)
Other versions
EP1340596A1 (fr
Inventor
Josef Fünfer
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 EP1340596A1 publication Critical patent/EP1340596A1/fr
Application granted granted Critical
Publication of EP1340596B1 publication Critical patent/EP1340596B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/131—Idling mode of tools

Definitions

  • the invention refers to a pneumatic impact mechanism for an at least partially striking hand tool 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.
  • the DE 2 702 128 discloses a striking mechanism according to the preamble of claim 1 and therefore relates to the closest prior art.
  • DE2702128 has a pneumatic impact mechanism as short as possible executed for a hammer, a cup-shaped flying pistons, in which radially inwardly an anvil penetrates. More on the doppelfopf pot-shaped hollow formed air piston are after the JP8141937 and JP7328955 previously known.
  • the object of the invention consists in the technologically simple realization of a non-impact pneumatic impact mechanism short design.
  • a pneumatic percussion for an at least partially striking hand tool on a pot-shaped flying pistons in the pot chamber radially inside a striker inside an axial penetration length penetrates and forms with this a damping, pneumatically active radial gap to substantially gas-tight closed pot space, which the through forcing the air piston axially driven striker within the penetration length to reverse the movement.
  • the gap surface formed by the radial annular gap between the striker and the flying piston is 3% to 6% of the striker formed by the striker within the flying piston whereby a reversal of motion occurs at the usual flapping frequencies of 50Hz to 100Hz within 10mm.
  • the gap thickness is 0.1 mm to 0.17 mm in conventional pneumatic percussion devices for handheld power tools with an approximately 50 g (0.050 kg) weighing striker and a pneumatically effective diameter of approx. 10 mm, which results in optimum results in test series ,
  • a pneumatic percussion mechanism of a hand-held power tool has a cup-shaped flying piston 2, in which radially inside a striker 3 movably penetrates within a tool-axial penetration length L, which over part of its outer circumferential surface with a part of the inner surface of the Aero-piston 2 forms a damping, pneumatically active radial gap X to a substantially gas-tight closed pot chamber 4.
  • Fig. 2 is at a pneumatically effective diameter D of the striker 3 of about 10mm, the thickness of the damping, radial radial gap X between 0.1 mm to 0.17 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Claims (3)

  1. Mécanisme de percussion pneumatique pour un appareil portatif au moins partiellement percutant (1), comprenant un piston volant en forme de pot (2) qui est entraîné par un ressort pneumatique et dans la cavité en pot (4) duquel une bouterolle (3) mobile dans les limites d'une longueur de pénétration axiale (L) pénètre en position intérieure radiale, caractérisé en ce que, conjointement avec le piston volant en forme de pot (2), la bouterolle (3) détermine par rapport à la cavité en pot fermée de manière sensiblement étanche aux gaz (4) un interstice radial d'amortissement (X) qui contraint la bouterolle (3) entraînée axialement par le piston volant (2) à inverser son déplacement dans les limites de la longueur de pénétration (L).
  2. Mécanisme de percussion pneumatique selon la revendication 1, caractérisé en ce que la surface d'interstice formée par l'interstice radial. (X) entre la bouterolle (3) et le piston volant (2) correspond à 3 % à 6 % de la section de bouterolle formée par la bouterolle (3) à l'intérieur du piston volant (2).
  3. Mécanisme de percussion pneumatique selon la revendication 1 ou 2, caractérisé en ce que l'épaisseur de l'interstice radial (X) est comprise entre 0,1 et 0,17 mm.
EP03405098A 2002-03-01 2003-02-19 Mécanisme de percussion à ressort pneumatique Expired - Lifetime EP1340596B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10209293A DE10209293A1 (de) 2002-03-01 2002-03-01 Pneumatisches Schlagwerk
DE10209293 2002-03-01

Publications (2)

Publication Number Publication Date
EP1340596A1 EP1340596A1 (fr) 2003-09-03
EP1340596B1 true EP1340596B1 (fr) 2010-02-03

Family

ID=27675174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03405098A Expired - Lifetime EP1340596B1 (fr) 2002-03-01 2003-02-19 Mécanisme de percussion à ressort pneumatique

Country Status (5)

Country Link
US (1) US20030221847A1 (fr)
EP (1) EP1340596B1 (fr)
JP (1) JP4340081B2 (fr)
CN (1) CN1442276A (fr)
DE (2) DE10209293A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005030340B3 (de) * 2005-06-29 2007-01-04 Wacker Construction Equipment Ag Schlagwerk mit elektrodynamischem Linearantrieb
AU2007202967A1 (en) 2006-07-01 2008-01-17 Black & Decker, Inc. A tool holder for a pavement breaker
JP2008012661A (ja) 2006-07-01 2008-01-24 Black & Decker Inc ハンマードリル用のビートピース磨耗表示器
US7413026B2 (en) 2006-07-01 2008-08-19 Black & Decker Inc. Lubricant system for powered hammer
DE102006000395A1 (de) * 2006-08-07 2008-02-14 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
SE531658C2 (sv) * 2006-10-02 2009-06-23 Atlas Copco Rock Drills Ab Slagverk jämte bergborrmaskin och bergborrigg
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
DE102011078628A1 (de) * 2011-07-05 2013-01-10 Robert Bosch Gmbh chlagwerkvorrichtung
KR101412092B1 (ko) * 2013-11-28 2014-07-02 주식회사 엔와이테크 저소음형 유압 타격 장치
JP6638149B2 (ja) * 2016-05-18 2020-01-29 株式会社マキタ 打撃工具
EP3670097A1 (fr) * 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Machine-outil portative

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB173093A (en) * 1920-10-07 1921-12-29 Chicago Pneumatic Tool Co Improvements in power hammers
DE2702128C3 (de) * 1977-01-20 1981-01-22 Metabowerke Kg, Closs, Rauch & Schnizler, 7440 Nuertingen Motorisch angetriebener Hammer, bei dem in einem Zylinder ein Kolben verschiebbar geführt ist
DE2844109A1 (de) * 1978-10-10 1980-04-24 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere bohr- und/oder schlaghammer
DE2844086A1 (de) * 1978-10-10 1980-04-30 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere schlaghammer
DE2929191C2 (de) * 1979-07-19 1984-08-02 Metabowerke GmbH & Co, 7440 Nürtingen Elektropneumatischer Hammer
US4462467A (en) * 1981-11-09 1984-07-31 Hilti Aktiengesellschaft Percussion drill machine
US4582144A (en) * 1984-04-25 1986-04-15 Makita Electric Works, Ltd. Percussive tools
DE3804026A1 (de) * 1987-12-21 1989-08-24 Bosch Gmbh Robert Motorisch angetriebener meissel- oder bohrhammer
JPH07328955A (ja) * 1994-06-09 1995-12-19 Hitachi Koki Co Ltd ハンマドリル
DE10032949A1 (de) * 2000-07-06 2002-01-17 Hilti Ag Schraubgerät

Also Published As

Publication number Publication date
JP2003266332A (ja) 2003-09-24
EP1340596A1 (fr) 2003-09-03
US20030221847A1 (en) 2003-12-04
JP4340081B2 (ja) 2009-10-07
DE50312392D1 (de) 2010-03-25
CN1442276A (zh) 2003-09-17
DE10209293A1 (de) 2003-09-18

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