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 EP20030405035 EP03405035A EP1334805B1 EP 1334805 B1 EP1334805 B1 EP 1334805B1 EP 20030405035 EP20030405035 EP 20030405035 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
characterised
switching unit
mode switching
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.)
Active
Application number
EP20030405035
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
Priority to DE10205030 priority Critical
Priority to DE2002105030 priority patent/DE10205030A1/en
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
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D16/00Portable 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
    • B25D16/006Mode changers; Mechanisms connected thereto
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D16/00Portable 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
    • B25D16/003Clutches specially adapted therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2216/00Details 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
    • B25D2216/0007Details of percussion or rotation modes
    • B25D2216/0015Tools having a percussion-only mode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2216/00Details 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
    • B25D2216/0007Details of percussion or rotation modes
    • B25D2216/0023Tools having a percussion-and-rotation mode
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25DPERCUSSIVE TOOLS
    • B25D2250/00General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/195Regulation means
    • B25D2250/205Regulation means for torque

Description

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.

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.

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.

For mechanical limitation of impermissibly high torques, especially at Tool blocking, slip clutches are used in the power transmission line.

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.

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.

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.

The task is essentially solved by the features of the independent claim. Advantageous further developments result from the subclaims.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The axially displaceable sliding sleeve is advantageously stepped radially, thereby creating an axial stop is designed for the sliding spring.

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
  • 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.

    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".

    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.
    EP20030405035 2002-02-07 2003-01-27 Switch for changing operating mode in a percussion hammer Active EP1334805B1 (en)

    Priority Applications (2)

    Application Number Priority Date Filing Date Title
    DE10205030 2002-02-07
    DE2002105030 DE10205030A1 (en) 2002-02-07 2002-02-07 Operating mode switching unit of a hand machine tool

    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
    EP20030405035 Active 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 (1) DE10205030A1 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN100509302C (en) * 2005-12-02 2009-07-08 株式会社牧田 Power tool

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    US7506694B2 (en) * 2002-09-13 2009-03-24 Black & Decker Inc. Rotary tool
    EP1650257B1 (en) * 2003-08-01 2010-09-08 Cemedine Co., Ltd. Curing composition and method for producing curing composition
    JP4405900B2 (en) * 2004-03-10 2010-01-27 株式会社マキタ Impact driver
    DE102004012433A1 (en) * 2004-03-13 2005-09-29 Robert Bosch Gmbh Hand tool
    DE102004025951A1 (en) 2004-05-27 2005-12-22 Robert Bosch Gmbh Hand tool, in particular drill and / or percussion hammer
    DE102004030760A1 (en) * 2004-06-25 2006-01-19 Robert Bosch Gmbh Device with a torque limiting unit
    DE102004034268B3 (en) * 2004-07-15 2005-12-29 Wacker Construction Equipment Ag Rotary hammer with safety coupling
    DE102004047470A1 (en) * 2004-09-30 2006-04-06 Robert Bosch Gmbh Hand tool, in particular drill and / or percussion hammer
    DE102004051911A1 (en) * 2004-10-26 2006-04-27 Robert Bosch Gmbh Hand tool, in particular drill
    US20060213675A1 (en) * 2005-03-24 2006-09-28 Whitmire Jason P Combination drill
    GB2427006A (en) * 2005-06-10 2006-12-13 Black & Decker Inc Overload clutch with two predetermined torque levels
    DE102005041448A1 (en) * 2005-08-31 2007-03-01 Robert Bosch Gmbh Hammer drill, comprises manually operated switch with outer shell and sealing ring
    US7410007B2 (en) * 2005-09-13 2008-08-12 Eastway Fair Company Limited Impact rotary tool with drill mode
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    US8590633B2 (en) 2006-07-01 2013-11-26 Black & Decker Inc. Beat piece wear indicator for powered hammer
    US7413026B2 (en) * 2006-07-01 2008-08-19 Black & Decker Inc. Lubricant system for powered hammer
    AU2007202968A1 (en) * 2006-07-01 2008-01-17 Black & Decker, Inc. A pavement breaker
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    JP4664253B2 (en) * 2006-08-24 2011-04-06 株式会社マキタ Impact tool
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    CN201664908U (en) 2007-06-15 2010-12-08 布莱克和戴克公司 Mixed impact tool
    US7861799B2 (en) * 2008-03-21 2011-01-04 Makita Corporation Impact tool
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    Also Published As

    Publication number Publication date
    US20030146007A1 (en) 2003-08-07
    US6976545B2 (en) 2005-12-20
    JP2003236769A (en) 2003-08-26
    JP4212912B2 (en) 2009-01-21
    EP1334805A1 (en) 2003-08-13
    CN1436634A (en) 2003-08-20
    DE10205030A1 (en) 2003-08-21
    CN1309532C (en) 2007-04-11

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