EP1448342A1 - Machine-outil a main pourvue d'un systeme de percussion pneumatique - Google Patents

Machine-outil a main pourvue d'un systeme de percussion pneumatique

Info

Publication number
EP1448342A1
EP1448342A1 EP02790250A EP02790250A EP1448342A1 EP 1448342 A1 EP1448342 A1 EP 1448342A1 EP 02790250 A EP02790250 A EP 02790250A EP 02790250 A EP02790250 A EP 02790250A EP 1448342 A1 EP1448342 A1 EP 1448342A1
Authority
EP
European Patent Office
Prior art keywords
hammer
cover
hammer tube
tube
tool
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.)
Ceased
Application number
EP02790250A
Other languages
German (de)
English (en)
Inventor
Frank Mueller
Gerhard Meixner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1448342A1 publication Critical patent/EP1448342A1/fr
Ceased 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
    • B25D11/005—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
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • 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
    • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
    • 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 present invention relates to a hand-held power tool - preferably a hammer drill or hammer - with a pneumatic hammer mechanism which has a hammer tube which has at least one control opening through which air can escape from the hammer tube in an idle position and which prevents the escape of air in an impact position Cover is closed.
  • Such a hand machine tool with a pneumatic hammer mechanism is such.
  • an axially displaceably mounted hammer tube is arranged in the machine housing.
  • An axially reciprocating piston is accommodated in the hammer tube, which is coupled to a racket via an air cushion.
  • a return spring acts on the hammer tube with a restoring force in the direction of an initial position, in which the air cushion space in the hammer tube is ventilated via a control opening, so that the hammer mechanism of the hammer drill or percussion hammer goes into idle and no more axial impacts are exerted on a tool.
  • the invention is based on the object of specifying a hand tool with a pneumatic hammer mechanism of the type mentioned, the efficiency of which is as high as possible.
  • the cover for the at least one control opening in the hammer tube consists of an elastomer.
  • a sealing gap which is harmful for the generation of the negative pressure in the hammer tube is avoided and the efficiency of the striking mechanism is thus increased.
  • a cover made of elastomer has manufacturing advantages over a steel control sleeve.
  • the hammer ear can be mounted displaceably in the direction of its longitudinal axis in the machine housing.
  • the cover is advantageously arranged in the machine housing, not displaceable in the axial direction, in such a way that the hammer tube moves with its at least one control opening under the cover during an axial displacement into the striking position.
  • an axially displaceably mounted holder for the cover is arranged in the maschmen housing, and means are available which axially shift the holding position with the cover during the transition from the idle position to the striking position, so that the cover over the at least one Control opening comes to rest in the hammer tube.
  • the means consist of a striker mounted in the hammer tube, which a tool inserted into the hammer tube moves to a processing point when the tool is pressed on, and which has a stop which transmits the axial movement of the striker to the holder of the cover.
  • the stop can be a disc placed on the striking die, which projects with one or more arms through an opening in the hammer tube to the holder surrounding the hammer tube.
  • the holder for the cover is designed in such a way that it enables the cover to play in the radial direction with respect to the hammer tube.
  • the cover is preferably a control sleeve surrounding the hammer tube.
  • FIG. 1 shows a partial longitudinal section through a hammer drill mechanism of a first
  • Figure 2 is a partial longitudinal section through the same striking mechanism in the idle position
  • FIG. 3 shows a partial longitudinal section through a hammer drill mechanism in a second
  • FIGS. 1 and 2 show a partial longitudinal section through the hammer mechanism of a rotary hammer, the hammer mechanism in the hammer position in FIG. 1 and in the idle position in FIG. 2.
  • the hammer mechanism of this hammer drill is constructed as follows:
  • a hammer tube 3 is rotatably mounted in the machine housing 1.
  • the hammer tube 3 forms a stop with both bearing points 5 and 7, so that it cannot be displaced in the direction of its longitudinal axis.
  • a piston 9 is accommodated in the hammer tube 3 and can be driven axially back and forth via a connecting rod 11.
  • the hammer tube 3 is provided at its end facing away from the piston 9 with a tool holder 13 into which a tool 15 is inserted with its shaft.
  • a hammer 17 and an anvil 19 are arranged axially displaceably in the hammer tube 3 in a known manner.
  • the striker 17 can be accelerated in the direction of the tool 15, impact energy being transmitted to the tool 15 via the striking block 19 by impact transfer.
  • At least one control opening 23 is located in the wall of the hammer tube 3, specifically in the area of the air cushion space 21.
  • a cover in the form of a control sleeve 25 surrounding the hammer tube 3 is provided.
  • This control sleeve 25 consists of an elastomer and its inner diameter is designed to be somewhat smaller than the outer diameter of the Harnmerrohr 3. In this way, the control sleeve 25 nestles very closely to the hammer tube 3, so that there is no sealing gap between the control sleeve 25 and the hammer tube 3 , through which the air can penetrate from the outside into the air cushion space 21 in the suction phase of the piston 9 or air is pressed out of the air cushion space 21 in the overrun phase of the piston. This creates a very high efficiency of the striking mechanism.
  • This bracket 27 can, for. B. as a seated on the hammer tube 3, on this axially displaceable sleeve, on the inner wall of the control sleeve 25 is fixed.
  • the control sleeve 25 made of elastomer can, for. B. sprayed on the inner wall of the bracket 27 as two component part or snapped into place as a molded part.
  • the holder 27 for the control sleeve 25 is designed by shaping and / or material selection so that it on the one hand gives the elastomer control sleeve 25 sufficient dimensional stability and on the other hand enables the control sleeve 25 to play in the radial direction with respect to the hammer tube 3.
  • a disc 29 is placed on the striker 19, which projects with one or more arms 31 through an opening 33 from the hammer tube 3 to the holder 17 surrounding the hammer tube 3.
  • the bracket 27 is pressed with its stop 35 by a compression spring 39 against the arm or arms 31 of the disk 29.
  • the compression spring 39 is supported on the one hand on the collar 5 on the inside of the machine housing 1 and on the other hand on a stop 37 on the outer circumference of the holder 27. This compression spring 39 pushes the holder 27 with the attached control sleeve 25 in the direction of the tool 15 inserted into the hammer tube 3.
  • the exemplary embodiment of a striking mechanism shown in FIG. 3 differs from the exemplary embodiment shown in FIGS. 1 and 2 in that the hammer tube 3 is mounted so as to be displaceable in the axial direction and no axial displacement is provided for the control sleeve 25.
  • the striking mechanism of FIG. 3 all parts that also occur in the embodiment shown in FIGS. 1 and 2 are provided with the same reference numerals.
  • the control sleeve 25 formed of elastomer, which tightly surrounds the hammer tube 3, is fixed in the axial and radial direction on the inside of the machine housing 1.
  • the control sleeve 25 is secured on the one hand by a stop 45 on the collar 5 of the machine housing 1 and on the other hand by a locking ring 47 inserted into the machine housing 1.
  • the compression spring 39 is supported on the collar 5 and on the at least one arm 31 of the washer 29 placed on the striker 19.
  • the pressure spring 39 displaces the hammer tube 3 in the direction of the tool 15 due to the pressure on the disk 29.
  • the at least one control opening 23 of the hammer tube 3 slides under the control sleeve 25 and the air can escape from the air cushion space 21 through the unlocked control opening 23 escape to the outside.
  • the striking mechanism is thus in its idle position.

Landscapes

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

Abstract

Le système de percussion selon l'invention comporte un tube-marteau (3) qui présente au moins une ouverture de commande (23) par laquelle, en position de fonctionnement à vide, l'air peut s'échapper du tube-marteau (3) et qui, en position de percussion, est fermée par un couvercle (25) empêchant la sortie de l'air. Pour que l'ouverture ou les ouvertures de commande (23) soient le plus étanche possible, et qu'ainsi le degré d'efficacité du système de percussion soit élevé, ledit couvercle (25) est formé à partir d'un élastomère.
EP02790250A 2001-11-16 2002-11-14 Machine-outil a main pourvue d'un systeme de percussion pneumatique Ceased EP1448342A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10156388A DE10156388A1 (de) 2001-11-16 2001-11-16 Handwerkzeugmaschine mit einem pneumatischen Schlagwerk
DE10156388 2001-11-16
PCT/DE2002/004228 WO2003045636A1 (fr) 2001-11-16 2002-11-14 Machine-outil a main pourvue d'un systeme de percussion pneumatique

Publications (1)

Publication Number Publication Date
EP1448342A1 true EP1448342A1 (fr) 2004-08-25

Family

ID=7706019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02790250A Ceased EP1448342A1 (fr) 2001-11-16 2002-11-14 Machine-outil a main pourvue d'un systeme de percussion pneumatique

Country Status (5)

Country Link
US (1) US7040413B2 (fr)
EP (1) EP1448342A1 (fr)
JP (1) JP2005510372A (fr)
DE (1) DE10156388A1 (fr)
WO (1) WO2003045636A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8185075B2 (en) * 2003-03-17 2012-05-22 Broadcom Corporation System and method for channel bonding in multiple antenna communication systems
DE10333799B3 (de) * 2003-07-24 2005-02-17 Wacker Construction Equipment Ag Hohlkolbenschlagwerk mit Luftausgleichs- und Leerlauföffnung
US8171553B2 (en) 2004-04-01 2012-05-01 Fireeye, Inc. Heuristic based capture with replay to virtual machine
EP1607187B1 (fr) * 2004-06-18 2010-04-28 HILTI Aktiengesellschaft Appareil pour l'amélioration de la réponse en coupure d'un outil électropneumatique à percussion
US7383895B2 (en) * 2005-08-19 2008-06-10 Makita Corporation Impact power tool
US8485274B2 (en) * 2007-05-14 2013-07-16 Makita Corporation Impact tool
DE102011078628A1 (de) * 2011-07-05 2013-01-10 Robert Bosch Gmbh chlagwerkvorrichtung
DE102011079367A1 (de) * 2011-07-05 2013-01-10 Robert Bosch Gmbh Schlagwerkvorrichtung
DE102011078627A1 (de) * 2011-07-05 2013-01-10 Robert Bosch Gmbh Schlagwerkvorrichtung
DE102011079828A1 (de) * 2011-07-26 2013-01-31 Hilti Aktiengesellschaft Handwerkzeugmaschine mit Dreipunktlagerung
EP2809470B1 (fr) 2012-02-03 2020-01-15 Milwaukee Electric Tool Corporation Marteau rotatif
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
US20240198505A1 (en) * 2022-12-20 2024-06-20 Milwaukee Electric Tool Corporation Percussion tool

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1136446A (fr) * 1979-06-18 1982-11-30 Norman J. Ince Marteau piqueur
DE3429140A1 (de) * 1984-08-08 1986-02-20 Black & Decker Inc., Newark, Del. Bohrhammer mit einem pneumatischen schlagwerk
GB2165279B (en) * 1984-10-03 1987-12-23 Inst Gornogo Dela Sibirskogo O Air-operated reversible percussive action machine
US4932479A (en) * 1988-05-05 1990-06-12 Vladimir Pyatov Vacuum-compression type percussion power tool with a pumping chamber
DE3826213A1 (de) * 1988-08-02 1990-02-15 Bosch Gmbh Robert Bohr- oder schlaghammer
SU1662832A1 (ru) * 1988-09-23 1991-07-15 Московское Научно-Производственное Объединение По Механизированному Строительному Инструменту И Отделочным Машинам Машина ударного действи
US5244521A (en) * 1991-05-31 1993-09-14 Ligman Gary A Pneumatic tool muffler system
DE19714288A1 (de) 1997-04-07 1998-10-08 Hilti Ag Bohr- und/oder Meisselgerät
DE19724531B4 (de) 1997-06-11 2005-07-14 Robert Bosch Gmbh Bohrhammer
JPH11170182A (ja) * 1997-12-15 1999-06-29 Makita Corp 打撃工具
DE10019071A1 (de) * 2000-04-18 2001-10-25 Hilti Ag Elekrohandwerkzeuggerät mit Leerschlagabschaltung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03045636A1 *

Also Published As

Publication number Publication date
DE10156388A1 (de) 2003-06-05
WO2003045636A1 (fr) 2003-06-05
JP2005510372A (ja) 2005-04-21
US20040016558A1 (en) 2004-01-29
US7040413B2 (en) 2006-05-09

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