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EP1334805B1 - Switch for changing operating mode in a percussion hammer - Google Patents

Switch for changing operating mode in a percussion hammer Download PDF

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Publication number
EP1334805B1
EP1334805B1 EP03405035A EP03405035A EP1334805B1 EP 1334805 B1 EP1334805 B1 EP 1334805B1 EP 03405035 A EP03405035 A EP 03405035A EP 03405035 A EP03405035 A EP 03405035A EP 1334805 B1 EP1334805 B1 EP 1334805B1
Authority
EP
European Patent Office
Prior art keywords
axially
operating mode
switching unit
mode switching
unit 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.)
Expired - Lifetime
Application number
EP03405035A
Other languages
German (de)
French (fr)
Other versions
EP1334805A1 (en
Inventor
Ralf Greitmann
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 EP1334805A1 publication Critical patent/EP1334805A1/en
Application granted granted Critical
Publication of EP1334805B1 publication Critical patent/EP1334805B1/en
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
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/003—Clutches specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • 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
    • B25D2250/195—Regulation means
    • B25D2250/205—Regulation means for torque

Definitions

  • the invention designates an operating mode switching unit at least partially rotating and striking hand tool like a combi hammer according to the preamble of claim 1.
  • Such Switching unit is from document JP 9 239 675 A known.
  • a hammer drill has a non-rotatable on the guide tube Externally manually operable, axially displaceable sliding sleeve with switching claws on which the drifting guide tube in a first operating mode in relation to the housing, in a second operating mode without rotation and in a third operating mode driving bevel gear ring.
  • a chisel hammer has a two-part guide tube, which via axially engaging locking balls in both radially and a spring-loaded can be fixed from the outside, manually displaceable, rotatable sliding sleeve.
  • slip clutches are used in the power transmission line.
  • a rotary hammer has a spring-loaded slip clutch which, between the hollow, containing an axially striking piston, abortive guide tube, which is non-rotatably connected to the tool holder, and a driving bevel pinion ring which is rotatable on the guide tube is arranged. Via an axially displaceable sliding sleeve that can be operated manually from the outside, according to one Disengage in case of overload, the slip clutch can be re-engaged.
  • a hammer drill has one of two axially resilient against one another pre-tensioned interlocking clutch rings on existing slip clutch, which between the hollow, containing an axially striking piston, abortive guide tube and a driving, rotatable on the guide tube Sprocket is arranged, which manually via one from the outside in three operating modes switchable, additional intermediate shaft is driven.
  • the object of the invention is the simple implementation of one in three operating modes manually switchable operating mode switch unit of a hand machine tool integrated slip clutch.
  • An operating mode switching unit essentially has one for at least three operating modes at least partially rotating and striking hand tool one Slip clutch, which is between a hollow, axially striking percussion piston containing, abortive guide tube and a rotatable on the guide tube, driving sprocket is arranged, and via a manually switchable from the outside, axially displaceable switching element can be switched into different operating modes, at least in one operating mode, the guide tube is driven in rotation, the axially displaceable Switching element in a form-locking manner in a driving, non-rotatably mounted to the guide tube Coupling ring of the slip clutch engages.
  • the axially displaceable sliding sleeve is advantageously stepped radially, thereby creating an axial stop is designed for the sliding spring.

Landscapes

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

Description

Die Erfindung bezeichnet eine Betriebsmodi-Schalteinheit einer zumindest teilweise drehenden und schlagenden Handwerkzeugmaschine wie einen Kombi-Hammer gemäß dem Oberbegriff des Anspruchs 1. Eine solche Schalteinheit ist aus dem Dokument JP 9 239 675 A bekannt.The invention designates an operating mode switching unit at least partially rotating and striking hand tool like a combi hammer according to the preamble of claim 1. Such Switching unit is from document JP 9 239 675 A known.

Nach der US4236588 weist ein Bohrhammer eine auf dem Führungsrohr drehfeste, von Aussen manuell betätigbare, axial versetzbare Schiebehülse mit Schaltklauen auf, welche das abtreibende Führungsrohr in einem ersten Betriebsmodus zum Gehäuse drehfest, in einem zweiten Betriebsmodus drehfrei und in einem dritten Betriebsmodus zum antreibenden Kegelritzelkranz festlegt.According to US4236588, a hammer drill has a non-rotatable on the guide tube Externally manually operable, axially displaceable sliding sleeve with switching claws on which the drifting guide tube in a first operating mode in relation to the housing, in a second operating mode without rotation and in a third operating mode driving bevel gear ring.

Nach der DE4009762 weist ein Meisselhammer ein zweiteiliges Führungsrohr auf, welches über in beide radial eingreifende Verrieglungskugeln und eine federnd vorgespannte, axial von Aussen manuell versetzbare, Schiebehülse dreheinstellbar festlegbar ist.According to DE4009762, a chisel hammer has a two-part guide tube, which via axially engaging locking balls in both radially and a spring-loaded can be fixed from the outside, manually displaceable, rotatable sliding sleeve.

Zur mechanischen Begrenzung unzulässig hoher Drehmomente, insbesondere bei einer Werkzeugblockierung, werden Rutschkupplungen im Kraftübertragungsstrang verwendet.For mechanical limitation of impermissibly high torques, especially at Tool blocking, slip clutches are used in the power transmission line.

Nach der DE3804414 weist ein Bohrhammer eine federnd vorgespannte Rutschkupplung auf, welche zwischen dem hohlen, einen axial schlagenden Schlagkolben beinhaltenden, abtreibenden Führungsrohr, welches drehfest mit der Werkzeugaufnahme verbunden ist, und einem, auf dem Führungsrohr drehbaren, antreibenden Kegelritzelkranz angeordnet ist. Über eine von Aussen manuell betätigbare, axial versetzbare Schiebehülse ist nach einem Auskuppeln bei Überlast die Rutschkupplung erneut einrastbar.According to DE3804414, a rotary hammer has a spring-loaded slip clutch which, between the hollow, containing an axially striking piston, abortive guide tube, which is non-rotatably connected to the tool holder, and a driving bevel pinion ring which is rotatable on the guide tube is arranged. Via an axially displaceable sliding sleeve that can be operated manually from the outside, according to one Disengage in case of overload, the slip clutch can be re-engaged.

Nach der JP9239675 weist ein Bohrhammer eine aus zwei gegeneinander axial federnd vorgespannt ineinandergreifenden Kupplungsringen bestehende Rutschkupplung auf, welche zwischen dem hohlen, einen axial schlagenden Schlagkolben beinhaltenden, abtreibenden Führungsrohr und einem, auf dem Führungsrohr drehbaren, antreibenden Zahnkranz angeordnet ist, welcher über eine von Aussen in drei Betriebsmodi manuell schaltbare, zusätzliche Zwischenwelle angetrieben wird. According to JP9239675, a hammer drill has one of two axially resilient against one another pre-tensioned interlocking clutch rings on existing slip clutch, which between the hollow, containing an axially striking piston, abortive guide tube and a driving, rotatable on the guide tube Sprocket is arranged, which manually via one from the outside in three operating modes switchable, additional intermediate shaft is driven.

Die Aufgabe der Erfindung besteht in der einfachen Realisierung einer in drei Betriebsmodi manuell schaltbaren Betriebsmodi-Schalteinheit einer Handwerkzeugmaschine mit integrierter Rutschkupplung.The object of the invention is the simple implementation of one in three operating modes manually switchable operating mode switch unit of a hand machine tool integrated slip clutch.

Die Aufgabe wird im wesentlichen durch die Merkmale des unabhängigen Anspruchs gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claim. Advantageous further developments result from the subclaims.

Im wesentlichen weist eine Betriebsmodi-Schalteinheit für zumindest drei Betriebsmodi einer zumindest teilweise drehenden und schlagenden Handwerkzeugmaschine eine Rutschkupplung auf, welche zwischen einem hohlen, einen axial schlagenden Schlagkolben beinhaltenden, abtreibenden Führungsrohr und einem, auf dem Führungsrohr drehbaren, antreibenden Zahnkranz angeordnet ist, und über ein von Aussen manuell schaltbares, axial versetzbares Schaltglied in unterschiedliche Betriebsmodi schaltbar ist, wobei in wenigstens einem Betriebsmodus das Führungsrohr drehangetrieben ist, wobei das axial versetzbare Schaltglied drehformschlüssig in einen drehfrei zum Führungsrohr gelagerten, antreibenden Kupplungsring der Rutschkupplung eingreift.An operating mode switching unit essentially has one for at least three operating modes at least partially rotating and striking hand tool one Slip clutch, which is between a hollow, axially striking percussion piston containing, abortive guide tube and a rotatable on the guide tube, driving sprocket is arranged, and via a manually switchable from the outside, axially displaceable switching element can be switched into different operating modes, at least in one operating mode, the guide tube is driven in rotation, the axially displaceable Switching element in a form-locking manner in a driving, non-rotatably mounted to the guide tube Coupling ring of the slip clutch engages.

Durch das drehformschlüssig in einen antreibenden Kupplungsring der Rutschkupplung eingreifende, axial versetzbare Schaltglied, kombiniert der antreibende Kupplungsring die Betriebsmodi-Schalteinheit technologisch einfach mit einer drehmomentanhängigen Rutschkupplung und führt somit zu einer Bauteileinsparung.Due to the positive locking in a driving clutch ring of the slip clutch engaging, axially displaceable switching element, the driving coupling ring combines the Operating mode switching unit technologically simple with a torque-dependent Slip clutch and thus leads to component savings.

Vorteilhaft besteht die Rutschkupplung aus zwei gegeneinander mit einer Axialfeder vorgespannten, axial reibkraftschlüssig ineinandergreifbaren Kupplungsringen, wodurch diese konstruktiv einfach um das Führungsrohr herum ausbildbar ist.The slip clutch advantageously consists of two against each other with an axial spring preloaded, axially frictionally engaging coupling rings, whereby this can be easily constructed around the guide tube.

Vorteilhaft ist der abtreibende Kupplungsring mit der Axialfeder zum Führungsrohr vorgespannt sowie drehfest zum Führungsrohr axial begrenzt beweglich gelagert, wodurch der drehfreie, antreibende Kupplungsring axial fest positioniert ist.The abortive coupling ring with the axial spring to the guide tube is advantageous preloaded and rotatably mounted axially limited to the guide tube, whereby the non-rotating, driving coupling ring is axially fixed.

Vorteilhaft ist das axial versetzbare, weiter vorteilhaft als Schiebehülse ausgebildete, Schaltglied mit dem antreibenden Kupplungsring über radiale Auskragungen und zugeordnete radiale Nuten drehformschlüssig verbunden, wodurch der Eingriff axial bewegungsfrei ausgebildet ist.The axially displaceable, further advantageously designed as a sliding sleeve, is advantageous Switching element with the driving coupling ring via radial projections and assigned radial grooves connected in a rotationally positive manner, whereby the engagement axially is designed to be motionless.

Vorteilhaft ist die axial versetzbare Schiebehülse an einem ersten Stirnende mit dem antreibenden Zahnkranz über, weiter vorteilhaft radiale, Auskragungen und zugeordnete Nuten drehformschlüssig verbindbar, wodurch ein Betriebsmodus mit Drehantrieb wie « Schlagbohren » schaltbar ist.The axially displaceable sliding sleeve is advantageous at a first end with the driving sprocket over, further advantageous radial, cantilever and associated Grooves can be connected in a form-locking manner, which means that an operating mode with rotary drive such as « Impact drilling »is switchable.

Vorteilhaft ist die axial versetzbare Schiebehülse an einem zweiten Stirnende mit einem gehäusefesten Arretierkranz über, weiter vorteilhaft radiale, Auskragungen und zugeordnete Nuten drehformschlüssig verbindbar, wodurch ein Betriebsmodus mit Dreharretierung wie « Meisseln » schaltbar ist.The axially displaceable sliding sleeve is advantageous at a second end with a Locking ring fixed to the housing via, further advantageously radial, projections and associated Grooves can be connected in a form-locking manner, which means that an operating mode with a rotation lock such as « Chisels »is switchable.

Vorteilhaft ist die axial versetzbare Schiebehülse kürzer als der eingreifende Abstand zwischen dem antreibenden Zahnkranz und dem gehäusefesten Arretierkranz, wodurch ein drehfreier Betriebsmodus wie « Meissel positionieren » schaltbar ist.The axially displaceable sliding sleeve is advantageously shorter than the engaging distance between the driving sprocket and the housing-fixed locking ring, whereby a non-rotating operating mode such as «position chisel» can be switched.

Vorteilhaft ist die axial versetzbare Schiebehülse gegen den drehfreien Kupplungsring über eine Schiebefeder axial vorgespannt, wodurch bezüglich des drehformschlüssigen Eingriffs eine synchronisierte Umschaltung zwischen den Betriebsmodi möglich ist.The axially displaceable sliding sleeve against the non-rotating coupling ring is advantageous a sliding spring axially biased, thereby with respect to the positive engagement synchronized switching between the operating modes is possible.

Vorteilhaft ist die axial versetzbare Schiebehülse radial abgestuft, wodurch ein Axialanschlag für die Schiebefeder ausgebildet ist.The axially displaceable sliding sleeve is advantageously stepped radially, thereby creating an axial stop is designed for the sliding spring.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit:

  • Fig. 1 als Betriebsmodi-Schalteinheit im Modus I
  • Fig. 2 als Modus II
  • Fig. 3 als Modus III
    • The invention is explained in more detail with respect to an advantageous exemplary embodiment with:
  • Fig. 1 as an operating mode switching unit in mode I.
  • Fig. 2 as mode II
  • Fig. 3 as mode III

    • Nach Fig. 1 weist eine als Einzelheit dargestellte Betriebsmodi-Schalteinheit einer nicht dargestellten drehenden und schlagenden Handwerkzeugmaschine mit einem Gehäuse 1 eine Rutschkupplung auf, welche zwischen einem hohlen, einen axial schlagenden Schlagkolben 2 beinhaltenden, abtreibenden Führungsrohr 3 und einem, auf dem Führungsrohr 3 drehbaren, antreibenden Zahnkranz 4 angeordnet ist, wobei eine, über eine nicht dargestellte Handhabe von Aussen manuell schaltbare, axial versetzbare Schiebehülse 5 drehformschlüssig in einen drehfrei zum Führungsrohr 3 gelagerten, antreibenden Kupplungsring 6 der Rutschkupplung eingreift. Die Rutschkupplung besteht aus dem zum Führungsrohr 3 axial fest positionierten, antreibenden Kupplungsring 6 und einem mit einer Axialfeder 7 zum Führungsrohr 3 vorgespannten sowie drehfest axial begrenzt beweglich gelagerten, abtreibenden Kupplungsring 8, welche nach dem Klauenprinzip axial reibkraftschlüssig ineinandergreifbar sind. Die axial versetzbare, umfänglich radial gekröpfte Schiebehülse 5 ist mit dem antreibenden Kupplungsring 6 über radiale Auskragungen 9 und zugeordnete radiale Nuten 10 drehformschlüssig verbunden. Im dargestellten Betriebsmode mit Drehantrieb ist die axial versetzbare Schiebehülse 5 an einem ersten Stirnende 11 mit dem antreibenden Zahnkranz 4 über radiale Auskragungen 9' und zugeordnete Nuten 10' drehformschlüssig verbunden.According to FIG. 1, an operating mode switching unit shown as a detail does not have one shown rotating and striking hand tool with a housing 1st a slip clutch, which between a hollow, an axially striking Percussion piston 2 containing, abortive guide tube 3 and one on the Guide tube 3 rotatable, driving ring gear 4 is arranged, one, via a Handle, not shown, manually switchable, axially displaceable sliding sleeve from the outside 5 rotatably in a non-rotatably mounted, driving to the guide tube 3 Coupling ring 6 engages the slip clutch. The slip clutch consists of the to Guide tube 3 axially fixed, driving clutch ring 6 and one with a Axial spring 7 preloaded to the guide tube 3 and axially movable in a rotationally fixed manner mounted, abortive coupling ring 8, which axially on the claw principle are frictionally interlocking. The axially displaceable, radially cranked circumference Sliding sleeve 5 is with the driving coupling ring 6 via radial projections 9 and assigned radial grooves 10 connected in a rotationally positive manner. In the operating mode shown with a rotary drive, the axially displaceable sliding sleeve 5 is on a first end face 11 the driving sprocket 4 via radial projections 9 'and associated grooves 10' rotationally connected.

    Nach Fig. 2 ist im dargestellten Betriebsmodus mit Dreharretierung die axial versetzbare Schiebehülse 5 an einem zweiten Stirnende 12 mit einem gehäusefesten Arretierkranz 13 über radiale Auskragungen 9" und zugeordnete Nuten 10" drehformschlüssig verbunden.2 is the axially displaceable in the illustrated operating mode with rotation lock Sliding sleeve 5 on a second end face 12 with a locking ring 13 fixed to the housing connected in a rotationally positive manner via radial projections 9 "and associated grooves 10".

    Nach Fig. 3 ist die mittig positionierte, axial versetzbare Schiebehülse 5 kürzer als der eingreifende Abstand zwischen dem antreibenden Zahnkranz 4 und dem gehäusefesten Arretierkranz 13, wodurch im dargestellten drehfreien Betriebsmodus kein Eingriff besteht. Die radial abgestufte Schiebehülse 5 ist von diesem Axialanschlag über eine Schiebefeder 14 gegen den drehfreien Kupplungsring 6 axial vorgespannt.3, the centrally positioned, axially displaceable sliding sleeve 5 is shorter than that engaging distance between the driving ring gear 4 and the housing-fixed Locking ring 13, whereby there is no intervention in the rotation-free operating mode shown. The radially stepped sliding sleeve 5 is from this axial stop via a sliding spring 14 axially biased against the non-rotating coupling ring 6.

    Claims (10)

    1. Operating mode switching unit of an at least partially rotating and percussive hand tool comprising a slip clutch, which is arranged between a tubular outputting guide pipe (3) which includes an axially percussing piston (2) and a driving toothed rim (4) and which is via a manually switched axially transposable switching element switchable in different operating modes, and in at least one operating mode the guide pipe (3) is rotary driven, characterised in that the axially transposable switching element engages in a rotary positive manner a driving clutch ring (6) of the slip clutch which is mounted free of rotation relative to the guide pipe (3).
    2. Operating mode switching unit according to Claim 1, characterised in that the slip clutch is composed of two clutch rings (6, 8), which are axially pretensioned relative to each other by an axial spring (7) and which axially frictionally positively interengage.
    3. Operating mode switching unit according to Claim 2, characterised in that the outputting clutch ring (8) is with the axial spring (7) pretensioned relative to the guide pipe (3) and mounted so as to be in a non-rotary manner axially of limited movability relative to the guide pipe (3).
    4. Operating mode switching unit according to one of the above claims, characterised in that the axially transposable switching element is via radial lips (9) and associated radial grooves (10) in a positive rotary manner connected to the driving clutch ring (6).
    5. Operating mode switching unit according to one of the above claims, characterised in that the axially transposable switching element is designed as a sliding sleeve (5).
    6. Operating mode switching unit according to Claim 5, characterised in that the axially transposable sliding sleeve (5) is rotary positively connectable to a first end surface (11) with the driving toothed rim (4) via optionally radial lips (9') and associated grooves (10').
    7. Operating mode switching unit according to Claim 5 or 6, characterised in that the axially transposable sliding sleeve (5) is connectible in a rotary positive manner at a second end surface (12) with an arresting rim (13) fixed to the housing via optionally radial collars (9") and associated grooves (10").
    8. Operating mode switching unit according to Claim 7, characterised in that the axially transposable sliding sleeve (5) is shorter than the engaging gap between the driving toothed rim (4) and the arresting rim (13) which is fixed to the housing.
    9. Operating mode switching unit according to one of Claims 5 to 8, characterised in that the axially transposible slide sleeve (6) is via a sliding spring (14) axially pretensioned against the non-rotary clutch ring (6).
    10. Operating mode switching unit according to one of the above Claims 5 to 9, characterised in that the axially transposable sliding sleeve (5) is radially stepped.
    EP03405035A 2002-02-07 2003-01-27 Switch for changing operating mode in a percussion hammer Expired - Lifetime EP1334805B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10205030A DE10205030A1 (en) 2002-02-07 2002-02-07 Operating mode switching unit of a hand machine tool
    DE10205030 2002-02-07

    Publications (2)

    Publication Number Publication Date
    EP1334805A1 EP1334805A1 (en) 2003-08-13
    EP1334805B1 true EP1334805B1 (en) 2004-11-24

    Family

    ID=27588466

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP03405035A Expired - Lifetime EP1334805B1 (en) 2002-02-07 2003-01-27 Switch for changing operating mode in a percussion hammer

    Country Status (5)

    Country Link
    US (1) US6976545B2 (en)
    EP (1) EP1334805B1 (en)
    JP (1) JP4212912B2 (en)
    CN (1) CN1309532C (en)
    DE (2) DE10205030A1 (en)

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    DE50300160D1 (en) 2004-12-30
    JP4212912B2 (en) 2009-01-21
    DE10205030A1 (en) 2003-08-21
    JP2003236769A (en) 2003-08-26
    US20030146007A1 (en) 2003-08-07
    US6976545B2 (en) 2005-12-20
    EP1334805A1 (en) 2003-08-13
    CN1436634A (en) 2003-08-20

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