EP1352718B1 - Système pneumatique à percussion - Google Patents

Système pneumatique à percussion Download PDF

Info

Publication number
EP1352718B1
EP1352718B1 EP03405216A EP03405216A EP1352718B1 EP 1352718 B1 EP1352718 B1 EP 1352718B1 EP 03405216 A EP03405216 A EP 03405216A EP 03405216 A EP03405216 A EP 03405216A EP 1352718 B1 EP1352718 B1 EP 1352718B1
Authority
EP
European Patent Office
Prior art keywords
ferromagnetic
percussive system
flying piston
piston
steel
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
EP03405216A
Other languages
German (de)
English (en)
Other versions
EP1352718A1 (fr
Inventor
Karl Echtler
Martin Richter
Lutz Troeder
Stefan Wanninger
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 EP1352718A1 publication Critical patent/EP1352718A1/fr
Application granted granted Critical
Publication of EP1352718B1 publication Critical patent/EP1352718B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B25D17/06—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
    • B25D2217/0023—Pistons

Definitions

  • the invention refers to a pneumatic percussion mechanism with a reciprocating air piston reciprocated by an air spring, preferably for use in at least partially striking hand-held power tools.
  • an electromechanically driven striking mechanism of a hand tool machine has a reciprocating piston which is reciprocated in a guide tube by an air spring and strikes an anvil and the front end of a tool accommodated in a tool holder.
  • the flying piston and the striker are usually made of steel, whereby at sufficiently high mass density for impact pulse generation also high toughness and strength is achieved.
  • US2283292 has a pneumatic percussion of a power hand tool a reciprocating in a guide tube by an air spring piston blade made of steel.
  • the flying piston in the impact contact region has a cylindrical insert made of another, shock-resistant material.
  • the non-impact-stressed inner core of the flying piston also consists of a metal heavier with respect to steel.
  • Such multi-part flying pistons have a reduced lifetime due to the impact damage of the separating surfaces and are also technologically complicated to manufacture.
  • the US3402776 discloses a percussion mechanism with a reciprocating flying piston which strikes, directly or by means of an intermediate striker, on the front end of a tool received in a tool receptacle, the one-piece flying piston and / or the striker being made of a non-ferromagnetic material in the form of Plastic exists.
  • the object is to realize a striking mechanism for use in the environment of strong magnetic fields.
  • an impact mechanism has a reciprocating air piston reciprocated by an air spring which strikes, directly or by means of an intermediate striker, the front end of a striking tool received in a tool receptacle, the one-piece flying piston and / or the striker being of non-ferromagnetic, advantageously hardenable material.
  • the one-piece design of the flying piston and / or anvil made of a non-ferromagnetic material allows full life of the full functionality of the percussion even in the environment of strong magnetic fields, as practical experiments showed.
  • the material is similar mass-dense and / or tough as steel, for example.
  • both the striker and the flying piston of a non-ferromagnetic material whereby a magnetically effected sticking is further suppressed.
  • the flying piston is guided in a guided in a guide tube, which further advantageously made of a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy, whereby a magnetically caused sticking to the guide tube is suppressed.
  • a guide tube which further advantageously made of a non-ferromagnetic, preferably diamagnetic material such as a magnesium-aluminum alloy, whereby a magnetically caused sticking to the guide tube is suppressed.
  • a hand tool on such impact mechanism whereby this is used in environments with strong, especially static, magnetic fields.
  • a common power hand tool in the form of an at least partially striking Combi hammer has a guided in a guide tube made of a magnesium-aluminum alloy, reciprocated by an air spring and flying piston, which encounters an anvil, on the front end of a recorded in a tool holder impact tool like a chisel hits.
  • the same geometry and technologically largely identically manufacturable flying piston and striker consists instead of ferromagnetic steel from a non-ferromagnetic chromium-nickel-steel alloy, especially from V4A.

Landscapes

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

Claims (7)

  1. Mécanisme de percussion comprenant un piston volant qui est déplacé en va-et-vient et qui percute, directement ou au moyen d'une bouterolle intercalée, l'extrémité frontale d'un outil logé dans un mandrin d'outil, le piston volant réalisé d'un seul tenant et/ou la bouterolle étant constitués d'un matériau non ferromagnétique, caractérisé en ce que le matériau possède une masse volumique et/ou une ténacité semblables à celles de l'acier.
  2. Mécanisme de percussion selon la revendication 1, caractérisé en ce que le matériau est un alliage d'acier non ferromagnétique, optionnellement apte à la trempe.
  3. Mécanisme de percussion selon une des revendications 1 à 2, caractérisé en ce qu'aussi bien la bouterolle que le piston volant sont réalisés en matériau non ferromagnétique.
  4. Mécanisme de percussion selon une des revendications 1 à 3, caractérisé en ce que le piston volant est guidé dans un tube de guidage.
  5. Mécanisme de percussion selon la revendication 4, caractérisé en ce que le tube de guidage est réalisé en matériau non ferromagnétique.
  6. Mécanisme de percussion selon la revendication 5, caractérisé en ce que le tube de guidage est réalisé en matériau diamagnétique.
  7. Appareil portatif, caractérisé en ce qu'il est prévu un mécanisme de percussion selon une des revendications précédentes.
EP03405216A 2002-04-11 2003-04-01 Système pneumatique à percussion Expired - Lifetime EP1352718B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10216051A DE10216051A1 (de) 2002-04-11 2002-04-11 Pneumatisches Schlagwerk
DE10216051 2002-04-11

Publications (2)

Publication Number Publication Date
EP1352718A1 EP1352718A1 (fr) 2003-10-15
EP1352718B1 true EP1352718B1 (fr) 2006-03-29

Family

ID=28051253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03405216A Expired - Lifetime EP1352718B1 (fr) 2002-04-11 2003-04-01 Système pneumatique à percussion

Country Status (5)

Country Link
US (1) US20040000414A1 (fr)
EP (1) EP1352718B1 (fr)
JP (1) JP2003311650A (fr)
CN (1) CN1449898A (fr)
DE (2) DE10216051A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004047606A1 (de) * 2004-09-30 2006-04-06 Hilti Ag Bohr- und/oder Meisselhammer
NL1030643C2 (nl) * 2005-12-12 2007-06-13 Arie Koenraad Jan Rokus Horden Elektrisch apparaat met slagmechanisme.
GB0912283D0 (en) 2009-07-15 2009-08-26 Black & Decker Inc Motor driven hammer having means for controlling the power of impact
DE102012013409A1 (de) * 2012-05-23 2013-11-28 Atlas Copco Construction Tools Gmbh Schlagvorrichtung
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
WO2019147919A1 (fr) 2018-01-26 2019-08-01 Milwaukee Electric Tool Corporation Outil à percussion

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402776A (en) * 1965-05-12 1968-09-24 Evgeny Vsevolodovich Alexandrov Device for impact loading a solid body
DE2242944B2 (de) * 1972-08-31 1981-04-23 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
JP3413991B2 (ja) * 1994-10-14 2003-06-09 日立工機株式会社 打込機のピストン装置
JP3292969B2 (ja) * 1995-08-18 2002-06-17 株式会社マキタ ハンマードリル
DE19843642B4 (de) * 1998-09-23 2004-03-25 Wacker Construction Equipment Ag Luftfederschlagwerk mit Rückholluftfeder
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

Also Published As

Publication number Publication date
JP2003311650A (ja) 2003-11-05
DE10216051A1 (de) 2003-10-23
US20040000414A1 (en) 2004-01-01
CN1449898A (zh) 2003-10-22
EP1352718A1 (fr) 2003-10-15
DE50302805D1 (de) 2006-05-18

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