US20070107920A1 - Motor driven drilling hammer - Google Patents

Motor driven drilling hammer Download PDF

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Publication number
US20070107920A1
US20070107920A1 US11/594,207 US59420706A US2007107920A1 US 20070107920 A1 US20070107920 A1 US 20070107920A1 US 59420706 A US59420706 A US 59420706A US 2007107920 A1 US2007107920 A1 US 2007107920A1
Authority
US
United States
Prior art keywords
drill sleeve
drilling hammer
elastomeric material
spring means
damping mass
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.)
Abandoned
Application number
US11/594,207
Other languages
English (en)
Inventor
Michael Keller
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Assigned to METABOWERKE GMBH reassignment METABOWERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KELLER, MICHAEL
Publication of US20070107920A1 publication Critical patent/US20070107920A1/en
Abandoned 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
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2217/0073—Arrangements for damping of the reaction force
    • B25D2217/0076—Arrangements for damping of the reaction force by use of counterweights
    • B25D2217/0092—Arrangements for damping of the reaction force by use of counterweights being spring-mounted
    • 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

Definitions

  • the invention concerns a motor-driven drilling hammer with a percussion and rotary drive, and a drill sleeve which is disposed in a housing.
  • a drilling hammer of the above-mentioned type in that the drill sleeve is connected on its outer periphery to a spring means of an elastomeric material which has a wall thickness of 1 to 10 mm, wherein the spring means has a damping mass which can be displaced in the peripheral and longitudinal directions of the drill sleeve relative thereto due to the elasticity of the spring means, thereby effecting damping to reduce vibrations.
  • the damping mass may oscillate in a translatory and also rotary direction.
  • the spring/mass system is thereby designed, such that oscillation of the damping mass in the translatory and rotary directions is, in each case, counter-phased to the oscillations of the drill sleeve, such that these oscillating frequencies are cancelled or effectively damped. This reduces the overall oscillation excitation of the drilling hammer by these two main components.
  • the vibrations at the handle are primarily generated by the percussion and rotary forces acting on the tool.
  • the oscillations can advantageously be damped to reduce vibrations.
  • the inventive design reduces vibrations in a highly effective fashion, since translatory and also rotary oscillations can be damped.
  • the inventive arrangement of the damping mass permits cancelling of at least two dominant excitation frequencies by one single mass.
  • the design of the spring/mass system depends on the geometry and weight of the damping mass, and the geometry and design of the elastomeric spring means. In order to reduce e.g. the damping frequency, the elastomeric mass may be thicker or the weight of the damping mass may be increased. This must be achieved in each case through suitable design of the spring/mass system in correspondence with the frequencies to be damped, which are generated during operation of the drilling hammer.
  • the elastomeric material may continuously surround the drill sleeve in the peripheral direction, and be substantially cylindrical. This produces a very load-resistant connection between the damping mass and the drill sleeve, which is also largely insensitive to shearing loads.
  • it may also be advantageous to segment the elastomeric material i.e. to provide several bordering or spaced-apart segments of elastomeric material on the outer periphery of the drill sleeve or to provide the elastomeric material with perforations, recesses or openings in a radial, tangential or axial direction.
  • a wall thickness of the elastomeric material of 4 to 8 mm has proven to be advantageous.
  • the elastomeric material has an axial extension in the longitudinal direction of the drill sleeve of 5 to 20 mm.
  • the damping mass may moreover advantageously be substantially cylindrical. This yields a symmetric mass distribution which is uniform and continuous in the peripheral direction around the drill sleeve, which is suitable in view of vibration damping.
  • the axial extension of the damping mass may advantageously also be 5 to 20 mm. It is preferably 3 to 8 times its wall thickness.
  • the damping mass/spring system is moreover advantageously designed to damp vibrations of between 30 and 100 Hz.
  • the oscillations to be cancelled are preferentially between 70 and 80 Hz.
  • FIG. 1 shows a sectional view of a relevant region of a drilling hammer
  • FIG. 2 shows a perspective view of the drilling hammer according to FIG. 1 , illustrating the rotary drive of the drill sleeve.
  • the figures show a region 2 comprising the drive components of an inventive drilling hammer.
  • a region comprising the electromotor and a handle region of the drilling hammer are not shown.
  • a main drive shaft extends through the indicated rotary duct 4 into the region 2 and drives a shaft 6 (in a manner not shown).
  • the shaft 6 has a wobble plate arrangement 8 (best shown in FIG. 2 ) which drives a percussion mechanism 10 of the drilling hammer, and a toothed wheel 12 (only shown in FIG. 2 ) which rotates a drill sleeve 14 .
  • the percussion mechanism 10 has a sleeve 18 , which defines a cylindrical chamber 16 and can be moved, i.e. axially reciprocated, by the wobble plate arrangement 8 in the longitudinal direction 20 of the drill sleeve 14 .
  • the sleeve 18 is disposed inside the drill sleeve 14 , concentrically thereto, and can be axially moved relative thereto.
  • a free flight body is provided as beater 22 within the cylindrical chamber 16 , which forms a pneumatic spring 24 together with the sleeve 18 .
  • the beater 22 initially remains in its position due to its inertial mass, thereby forming an underpressure within the cylindrical chamber 16 , which then causes delayed acceleration of the beater 22 .
  • the sleeve 18 is moved again to the right in FIG. 1 , the cylindrical chamber and the air contained therein are compressed, in particular to between 10 and 20 bar, which greatly accelerates the beater 22 towards the right and towards an intermediate piston 26 .
  • the impact surface 28 of the beater 22 facing the intermediate piston 26 , strikes the intermediate piston 26 and is thereby immediately stopped, wherein the momentum is transferred to the intermediate piston 26 which subsequently strikes a tool, a drill or chisel, transferring a further momentum (percussion or hammer operation).
  • a spring means 32 of an elastomeric material 34 is provided on the outer periphery 31 of the drill sleeve 14 .
  • the spring means 32 or the elastomeric material 34 continuously surround the outer periphery 30 of the drill sleeve 15 in the peripheral direction. It is substantially cylindrical and has a wall thickness of between 1 and 10, in particular, 4 and 8 mm.
  • a damping mass 36 which also has a cylindrical basic geometry, is provided radially outside on the elastomeric material 34 , and in the example shown, concentrically to the drill sleeve 14 .
  • the damping mass 36 can be deflected in a resilient fashion relative to the drill sleeve 14 by the spring means 32 of elastomeric material in an axial, longitudinal direction 20 as well as in a peripheral direction.
  • the connection between the damping mass 36 and the drill sleeve 14 basically provides six degrees of freedom due to the elastomeric material 34 .
  • the damping mass/spring system is designed such that, due to the resilient deflectable arrangement of the damping mass 36 , the damping mass 36 can oscillate in a translatory and rotary direction with a respective phase which is opposite to that of the excitation oscillations acting on the drill sleeve, to thereby damp, cancel, or provide effective reduction of vibration. This eliminates two main components of the overall oscillation excitation of the drilling hammer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Drilling And Boring (AREA)
US11/594,207 2005-11-16 2006-11-08 Motor driven drilling hammer Abandoned US20070107920A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05024979A EP1787761B1 (de) 2005-11-16 2005-11-16 Motorisch angetriebener Bohrhammer
EP05024979.6 2005-11-16

Publications (1)

Publication Number Publication Date
US20070107920A1 true US20070107920A1 (en) 2007-05-17

Family

ID=36118295

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/594,207 Abandoned US20070107920A1 (en) 2005-11-16 2006-11-08 Motor driven drilling hammer

Country Status (5)

Country Link
US (1) US20070107920A1 (de)
EP (1) EP1787761B1 (de)
CN (1) CN101181784B (de)
AT (1) ATE454248T1 (de)
DE (1) DE502005008837D1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9308636B2 (en) 2012-02-03 2016-04-12 Milwaukee Electric Tool Corporation Rotary hammer with vibration dampening
US9849577B2 (en) 2012-02-03 2017-12-26 Milwaukee Electric Tool Corporation Rotary hammer
US20180208438A1 (en) * 2015-07-24 2018-07-26 Inventio Ag Automated mounting device for performing assembly jobs in an elevator shaft of an elevator system
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
US10926393B2 (en) 2018-01-26 2021-02-23 Milwaukee Electric Tool Corporation Percussion tool
US11571796B2 (en) 2018-04-04 2023-02-07 Milwaukee Electric Tool Corporation Rotary hammer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010041928A1 (de) * 2010-10-04 2012-04-05 Robert Bosch Gmbh Mehrdimensionaler Schwingungstilger

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491184A (en) * 1981-09-09 1985-01-01 Kioritz Corporation Vibration damping device for mowing machine
US4905772A (en) * 1988-09-01 1990-03-06 Honsa Thomas W Rotary power tool with vibration damping
US5327636A (en) * 1990-11-06 1994-07-12 The Charles Machine Works, Inc. Reversible impact-operated boring tool
US5332131A (en) * 1992-09-28 1994-07-26 Pehr Harold T Kicker latch for container closures
US5855069A (en) * 1996-05-21 1999-01-05 Kioritz Corporation Disengagement-preventing mechanism and bush cutter provided with disengagement-preventing mechanism
US5927407A (en) * 1993-01-27 1999-07-27 Lord Corporation Isolated hand-held vibrating device
US6073705A (en) * 1997-10-06 2000-06-13 Makita Corporation Power-driven striking tool having a mechanism for setting the circumferential angle of tool bits attached to the striking tool
US6675908B1 (en) * 1999-07-20 2004-01-13 Robert Bosch Gmbh Drilling hammer or impact hammer
US6763897B2 (en) * 2001-04-20 2004-07-20 Black & Decker Inc. Hammer
US6902012B2 (en) * 2000-05-02 2005-06-07 Hilti Aktiengesellschaft Percussion electrical hand-held tool
US6907943B2 (en) * 2003-01-16 2005-06-21 Makita Corporation Electric hammer
US6948571B2 (en) * 2001-03-07 2005-09-27 Black & Decker Inc. Hammer
US7096973B2 (en) * 2003-05-09 2006-08-29 Makita Corporation Power tool

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2851160A1 (de) * 1978-11-25 1980-06-04 Wacker Werke Kg Vorrichtung zum mindern der geraeuschentwicklung an den werkzeugen von bohr- und aufbruchhaemmern
WO1994016864A1 (en) * 1993-01-27 1994-08-04 Lord Corporation Vibration isolator for hand-held vibrating devices
US5813477A (en) * 1996-05-23 1998-09-29 Chicago Pneumatic Tool Company Vibration-reduced impact tool and vibration isolator therefor
US7032683B2 (en) * 2001-09-17 2006-04-25 Milwaukee Electric Tool Corporation Rotary hammer
GB2399615B (en) * 2003-03-21 2006-03-15 Black & Decker Inc Vibration reduction apparatus for power tool and power tool incorporating such apparatus
EP1464449B1 (de) * 2003-04-01 2010-03-24 Makita Corporation Kraftwerkzeug

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491184A (en) * 1981-09-09 1985-01-01 Kioritz Corporation Vibration damping device for mowing machine
US4905772A (en) * 1988-09-01 1990-03-06 Honsa Thomas W Rotary power tool with vibration damping
US5327636A (en) * 1990-11-06 1994-07-12 The Charles Machine Works, Inc. Reversible impact-operated boring tool
US5332131A (en) * 1992-09-28 1994-07-26 Pehr Harold T Kicker latch for container closures
US5927407A (en) * 1993-01-27 1999-07-27 Lord Corporation Isolated hand-held vibrating device
US5855069A (en) * 1996-05-21 1999-01-05 Kioritz Corporation Disengagement-preventing mechanism and bush cutter provided with disengagement-preventing mechanism
US6073705A (en) * 1997-10-06 2000-06-13 Makita Corporation Power-driven striking tool having a mechanism for setting the circumferential angle of tool bits attached to the striking tool
US6675908B1 (en) * 1999-07-20 2004-01-13 Robert Bosch Gmbh Drilling hammer or impact hammer
US6902012B2 (en) * 2000-05-02 2005-06-07 Hilti Aktiengesellschaft Percussion electrical hand-held tool
US6948571B2 (en) * 2001-03-07 2005-09-27 Black & Decker Inc. Hammer
US6763897B2 (en) * 2001-04-20 2004-07-20 Black & Decker Inc. Hammer
US6907943B2 (en) * 2003-01-16 2005-06-21 Makita Corporation Electric hammer
US7096973B2 (en) * 2003-05-09 2006-08-29 Makita Corporation Power tool

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9849577B2 (en) 2012-02-03 2017-12-26 Milwaukee Electric Tool Corporation Rotary hammer
US10195730B2 (en) 2012-02-03 2019-02-05 Milwaukee Electric Tool Corporation Rotary hammer
US9308636B2 (en) 2012-02-03 2016-04-12 Milwaukee Electric Tool Corporation Rotary hammer with vibration dampening
US20180208438A1 (en) * 2015-07-24 2018-07-26 Inventio Ag Automated mounting device for performing assembly jobs in an elevator shaft of an elevator system
US10836610B2 (en) * 2015-07-24 2020-11-17 Inventio Ag Automated mounting device for performing assembly jobs in an elevator shaft of an elevator system
US11633843B2 (en) 2017-10-20 2023-04-25 Milwaukee Electric Tool Corporation Percussion tool
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
US10926393B2 (en) 2018-01-26 2021-02-23 Milwaukee Electric Tool Corporation Percussion tool
US11141850B2 (en) 2018-01-26 2021-10-12 Milwaukee Electric Tool Corporation Percussion tool
US11203105B2 (en) 2018-01-26 2021-12-21 Milwaukee Electric Tool Corporation Percussion tool
US11059155B2 (en) 2018-01-26 2021-07-13 Milwaukee Electric Tool Corporation Percussion tool
US11759935B2 (en) 2018-01-26 2023-09-19 Milwaukee Electric Tool Corporation Percussion tool
US11865687B2 (en) 2018-01-26 2024-01-09 Milwaukee Electric Tool Corporation Percussion tool
US11571796B2 (en) 2018-04-04 2023-02-07 Milwaukee Electric Tool Corporation Rotary hammer

Also Published As

Publication number Publication date
EP1787761B1 (de) 2010-01-06
DE502005008837D1 (de) 2010-02-25
ATE454248T1 (de) 2010-01-15
EP1787761A1 (de) 2007-05-23
CN101181784A (zh) 2008-05-21
CN101181784B (zh) 2010-05-12

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Legal Events

Date Code Title Description
AS Assignment

Owner name: METABOWERKE GMBH,GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KELLER, MICHAEL;REEL/FRAME:018537/0385

Effective date: 20060801

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION