EP2243580A2 - mécanisme d'impacte pneumatique et machine-outil portative avec un tel mécanisme - Google Patents

mécanisme d'impacte pneumatique et machine-outil portative avec un tel mécanisme Download PDF

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Publication number
EP2243580A2
EP2243580A2 EP10158108A EP10158108A EP2243580A2 EP 2243580 A2 EP2243580 A2 EP 2243580A2 EP 10158108 A EP10158108 A EP 10158108A EP 10158108 A EP10158108 A EP 10158108A EP 2243580 A2 EP2243580 A2 EP 2243580A2
Authority
EP
European Patent Office
Prior art keywords
piston
guide cylinder
plastic
flying
pneumatic
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Withdrawn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
EP10158108A
Other languages
German (de)
English (en)
Other versions
EP2243580A3 (fr
Inventor
Ferdinand Kristen
Stefan Hammerstingl
Erwin Manschitz
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 EP2243580A2 publication Critical patent/EP2243580A2/fr
Publication of EP2243580A3 publication Critical patent/EP2243580A3/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Withdrawn legal-status Critical Current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
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • 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
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0023—Pistons
    • 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

Definitions

  • the present invention relates to a pneumatic percussion and a hand tool with a pneumatic percussion.
  • the US 4,602,689 describes a hand tool with a pneumatic percussion.
  • a flying piston is arranged, which is excited by a driven exciter piston to a periodic movement.
  • the guide cylinder is coated with a thermally insulating plastic layer to reduce heat loss from a pneumatic between excitation piston and flying piston.
  • the flying mass has a plastic sheath for improved thermal insulation.
  • the core of the flying piston is made of metal, in order to withstand the mechanical loads.
  • the guide cylinder is made of metal.
  • One task is to reduce the overall weight of a striking mechanism.
  • the pneumatic impact mechanism comprises a guide cylinder in which a flying piston and an excitation piston are arranged to be movable along a striking axis.
  • the guide cylinder has a plastic.
  • a pneumatic space, completed by the guide cylinder, the flying piston and the exciter piston, and a drive for periodically moving the exciter piston, whereby the flying piston is excited to a periodic movement between the face and exciter piston, are provided in the hammer mechanism.
  • the moving parts are at least partially made of plastic, you went away from, the guide tube must be made of metal.
  • the GB 1 246 357 refers in particular to the longer relaxation time that is inherent in plastics, and limits their use.
  • an inner wall of the guide cylinder is formed from plastic. This is particularly advantageous if the movable elements excitation piston and flying piston are at least partially made of plastic. The thermal expansion coefficients are thus naturally matched and the relative dimensions of the elements are maintained during operation.
  • the guide cylinder can also be formed entirely of plastic.
  • a lateral surface of the excitation piston and / or a lateral surface of the flying piston can be formed from a further plastic.
  • the plastic of the guide cylinder and the other plastic of the lateral surfaces of the excitation piston and / or the flying piston can be the same.
  • the plastic for an inner wall of the guide cylinder is preferably a thermoset, e.g. from the class of aminoplasts, phenoplasts and epoxy resins.
  • the inner dimensions of the guide cylinder must be achieved with high accuracy.
  • the strength of the plastic may be limited by fillers, e.g. Glass balls or glass fibers are increased. The fillers must be completely covered on the inner wall by the plastic.
  • the guide cylinder may consist of a plurality of plastic layers, wherein a layer for the inner wall of the guide cylinder is made of a thermosetting plastic. Outer layers may advantageously be made of thermoplastics.
  • the multilayer structure made of different plastics allows a high rigidity of the guide tube through the thermoplastic materials.
  • Teflon fibers can be inserted for reinforcement. Examples of a suitable thermoplastic are polyamides.
  • Fig. 1 shows a hammer drill 1 as an example of a hand tool 1.
  • a pneumatic percussion 5 is arranged in which an excitation piston 12 and a flying piston 13 are arranged to be movable.
  • the excitation piston 12 and the flying piston 13 close with an inner wall 11 of the guide cylinder 10 airtight.
  • additional sealing rings 15, 16 may be provided.
  • the guide cylinder 10, the excitation piston 12 and the flying piston 13 include a pneumatic chamber 19 a.
  • a drive 3, e.g. an electric motor is coupled via a shaft 4 and an eccentric 32 with the excitation piston 12.
  • the excitation piston 12 driven by the drive 3 performs a periodic forward and backward movement in the guide cylinder 10.
  • the flying mass 13 is excited to a periodic forward and backward movement by means of the coupling via the pneumatic chamber 19 to the exciter piston 12.
  • an anvil 20 is provided, on which the flying mass 13 abuts.
  • the flying piston 13 can also strike directly on a tool, which is introduced into the hammer mechanism.
  • the guide cylinder 10 is made of a plastic.
  • the guide cylinder 10 is manufactured as a one-piece injection molded body.
  • the guide cylinder 10 can be milled from a plastic block.
  • the guide cylinder 10 has an outer skeleton of metal and the inner wall is formed of plastic.
  • the outer skeleton may be a hollow cylinder or a hollow cylinder provided with openings.
  • a further embodiment provides that a metal mesh is embedded in the plastic of the guide cylinder 10.
  • the metal mesh increases the mechanical stability of the guide cylinder 10 without affecting the thermal properties. Furthermore, the metal mesh contributes only slightly to the weight.
  • the excitation piston 12 may be made partially or completely of plastic.
  • a lateral surface of the cylindrical exciter piston 12 is made of plastic.
  • the surface of the excitation piston 12 facing the flying mass 13 can be formed from plastic.
  • the flying mass 13 preferably has a solid core made of a metal which defines the mass of the flying mass 13.
  • a lateral surface of the cylindrical flying piston 13 and / or a surface facing the exciting piston 12 can be made of plastic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP10158108A 2009-04-20 2010-03-29 mécanisme d'impacte pneumatique et machine-outil portative avec un tel mécanisme Withdrawn EP2243580A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009002474A DE102009002474A1 (de) 2009-04-20 2009-04-20 Pneumatisches Schlagwerk und Handwerkzeugmaschine

Publications (2)

Publication Number Publication Date
EP2243580A2 true EP2243580A2 (fr) 2010-10-27
EP2243580A3 EP2243580A3 (fr) 2011-05-25

Family

ID=42272028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10158108A Withdrawn EP2243580A3 (fr) 2009-04-20 2010-03-29 mécanisme d'impacte pneumatique et machine-outil portative avec un tel mécanisme

Country Status (3)

Country Link
US (1) US9199369B2 (fr)
EP (1) EP2243580A3 (fr)
DE (1) DE102009002474A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10102144B2 (en) 2013-04-16 2018-10-16 Sandisk Technologies Llc Systems, methods and interfaces for data virtualization
US10558561B2 (en) 2013-04-16 2020-02-11 Sandisk Technologies Llc Systems and methods for storage metadata management
US9842128B2 (en) 2013-08-01 2017-12-12 Sandisk Technologies Llc Systems and methods for atomic storage operations
US10019320B2 (en) 2013-10-18 2018-07-10 Sandisk Technologies Llc Systems and methods for distributed atomic storage operations
US10073630B2 (en) 2013-11-08 2018-09-11 Sandisk Technologies Llc Systems and methods for log coordination
EP2910336A1 (fr) * 2014-02-21 2015-08-26 HILTI Aktiengesellschaft Machine-outil portative
US9946607B2 (en) 2015-03-04 2018-04-17 Sandisk Technologies Llc Systems and methods for storage error management
US10344861B2 (en) 2015-04-24 2019-07-09 Caterpillar Inc. Hammer having composite piston sleeve
EP3117962A1 (fr) * 2015-07-17 2017-01-18 HILTI Aktiengesellschaft Machine-outil portative
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
DE102020209356A1 (de) 2020-07-24 2022-01-27 Robert Bosch Gesellschaft mit beschränkter Haftung Schlagwerkvorrichtung für eine Handwerkzeugmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1246357A (en) 1969-08-25 1971-09-15 Inst Gornogo Dela Imeni Skochi Improvements relating to impact mechanisms
US4602689A (en) 1980-03-19 1986-07-29 Robert Bosch Gmbh Power tool

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945935A1 (de) * 1979-11-14 1981-05-27 Robert Bosch Gmbh, 7000 Stuttgart Handwerkzeugmaschine mit einem luftfederschlagwerk
US4388776A (en) * 1980-06-16 1983-06-21 Tomy Corporation Pneumatically operated toy employing a movable implement
DE3224176C2 (de) * 1982-06-29 1995-02-02 Bosch Gmbh Robert Motorisch angetriebene schlagende Handwerkzeugmaschine
US4738339A (en) * 1985-03-08 1988-04-19 Tayco Developments, Inc. Energy absorber device with composite plastic casing having high strength inner cylinder
US5348425A (en) * 1992-11-10 1994-09-20 Heiliger Robert W Piston cylinder device with a protective coating and method of producing such a coating
US6395359B1 (en) * 1997-08-13 2002-05-28 The United States Of America As Represented By The Secretary Of The Navy Power cylinder non-metallic liner seal assembly
DE19828423C2 (de) * 1998-06-25 2000-05-18 Wacker Werke Kg Antriebskolben für ein Luftfederschlagwerk
WO2000029210A1 (fr) * 1998-11-18 2000-05-25 Daikin Industries, Ltd. Structure polymere contenant du fluor a adhesivite haute temperature, et materiau de glissement utilisant ladite structure
GB9902789D0 (en) * 1999-02-09 1999-03-31 Black & Decker Inc Rotary hammer
JP2005193354A (ja) * 2004-01-09 2005-07-21 Hitachi Koki Co Ltd 打撃工具
DE102005021734A1 (de) * 2005-05-11 2006-11-16 Robert Bosch Gmbh Elektrowerkzeugmaschine
US20110083870A1 (en) * 2005-09-23 2011-04-14 Mccarty Ii H Downman Combination of Impact Tool And Shaped Relatively Lower Modulus Material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1246357A (en) 1969-08-25 1971-09-15 Inst Gornogo Dela Imeni Skochi Improvements relating to impact mechanisms
US4602689A (en) 1980-03-19 1986-07-29 Robert Bosch Gmbh Power tool

Also Published As

Publication number Publication date
DE102009002474A1 (de) 2010-10-21
US9199369B2 (en) 2015-12-01
EP2243580A3 (fr) 2011-05-25
US20100263894A1 (en) 2010-10-21

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