US20060286910A1 - Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool - Google Patents

Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool Download PDF

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Publication number
US20060286910A1
US20060286910A1 US10/552,225 US55222505A US2006286910A1 US 20060286910 A1 US20060286910 A1 US 20060286910A1 US 55222505 A US55222505 A US 55222505A US 2006286910 A1 US2006286910 A1 US 2006286910A1
Authority
US
United States
Prior art keywords
guard
rotation
recited
blocking
insertion 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.)
Abandoned
Application number
US10/552,225
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English (en)
Inventor
Mike Voigt
Albert Kleider
Kurt Neef
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
Individual
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 Individual filed Critical Individual
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NEEF, KURT, KLEIDER, ALBERT, VOIGT, MIKE
Publication of US20060286910A1 publication Critical patent/US20060286910A1/en
Priority to US12/797,663 priority Critical patent/US8011997B2/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools

Definitions

  • the present invention is directed to a guard for a power tool, a power tool, and a system composed of guard and power tool according to the descriptions of the species in the independent claims.
  • the present invention is directed to a guard for a power tool with a rotatably driven insertion tool, with which at least portions of the insertion tool can be covered.
  • At least one blocking means is provided that at least prevents the insertion tool from turning around an axis of rotation.
  • protection against contact with the insertion tool is improved and a protective function against a shattering of the insertion tool is ensured.
  • fragments slung off of the shattered insertion tool are prevented from rotating the guard on the drive shaft so far that the fragments pose a risk to an operator. If damage occurs, the blocking of the guard rotation is independent of a tightening torque used to attach the guard.
  • the blocking means is preferably formed by a stop cam in a flange designed for fastening that extends substantially parallel to the axis of rotation.
  • the guard is installed with the flange on the power tool, thereby enabling a space-saving and easy-to-handle arrangement of the rotation-prevention means.
  • the stop cam can point inward. An arrangement with an outwardly-oriented stop cam is also possible.
  • the blocking means is formed by a stop cam in a clamp connected with the flange, a high degree of safety can be obtained using means that are easy to manufacture.
  • the rotation-prevention means is not dependent on a clamping force given by a tightening torque of an attachment screw used to attach the clamp to a collar. The rotation-prevention means is effective even if the attachment screw was accidentally under-tightened. If the stop cam hits a stop, the guard is held securely in this position.
  • stop cam in the installed state, points toward a collar, a corresponding stop can be provided on the collar of the power tool.
  • the entire rotation-prevention means is located inside the guard.
  • the blocking means is formed by an outwardly-projecting blocking lug on the guard, it can be machined—economically and easily—directly out of the sheet metal of the guard.
  • the blocking lug can also be welded on, adhesively bonded or screwed into place.
  • the blocking lug can also be installed as a retrofit.
  • the blocking lug can project outward. As an alternative, it can also point inward, in a suitable location.
  • the rotation-prevention means can be positioned in a space-saving manner.
  • the blocking lug can also be located on a surface extending substantially perpendicular to the axis of rotation, adjacent to an opening for a drive shaft of the insertion tool to be covered by the guard. As a result, the blocking lug advantageously does not extend into the operator's working area.
  • the present invention also relates to a power tool with an electric motor located in a housing, the electric motor rotatably driving the insertion tool.
  • a rotation-prevention means is provided that at least prevents the insertion tool from being released in the direction of an operator.
  • the guard can be limited, at the least, from rotating around an axis of rotation of the insertion tool. As a result, protection against contact with the insertion tool is improved and a protective function against a shattering of the insertion tool is ensured. As a result, fragments slung off of the shattered insertion tool are prevented from rotating the guard on the drive shaft so far that the fragments pose a risk to an operator.
  • rotation-prevention means includes a stop means that corresponds with the blocking means, rotation of the guard can be limited to a narrow angular range, or it can be prevented entirely.
  • a collar includes a guide groove with a limiting groove located at an angle thereto, a clamp with a stop cam pressed through on its inside can be inserted.
  • the guard can only be rotated within the limiting groove; this limits the angular range of the guard.
  • the guard can be fixed in any position in the limiting groove.
  • a blocking lug and/or a stop cam can hit it, and the guard can be prevented from rotating in an undesired manner.
  • the present invention also relates to a system composed of guard and power tool.
  • a rotation-prevention means is provided with a blocking means on the guard side and with a corresponding stop means on the power tool side.
  • the blocking means can be an integral part of the guard, e.g., a blocking lug or a cam, or it can be provided on a fastening device with which the guard is connected with the power tool.
  • the guard is reliably prevented from rotating past the stop.
  • the rotation-prevention means can be triggered by the insertion tool acting on the guard, the operator's safety can be ensured in case of maloperation.
  • the guard can be rotated, at the most, within an angular range in which safety is still ensured. Installation of the guard in a position that is common for normal operation of the power tool is not prevented.
  • the power tool is designed as an angle grinder, the grinding disc of which is covered by a guard, at least in some areas. If the grinding disc shatters, the guard can no longer be driven by the fragments in the original direction of rotation so far that the operator could be struck by fragments.
  • the rotation-prevention means is independent of a tightening torque used to attach the guard to a collar.
  • FIG. 1 Shows a preferred angle grinder
  • FIG. 2 Shows a schematic depiction of a side view according to a first exemplary embodiment
  • FIG. 3 Shows a depiction of a maximum angular range of rotation of the guard
  • FIG. 4 Shows a schematic view of a clamp for attaching the guard
  • FIG. 5 Shows a top view of a guard with clamp
  • FIG. 6 Shows a rotation-prevention means according to a second exemplary embodiment.
  • FIG. 1 A power tool designed as a preferred angle grinder is shown in FIG. 1 .
  • An electric motor (not shown) is located in a housing 10 , the electric motor rotatably driving an insertion tool 14 , which is a grinding disc in this case.
  • an output shaft of the electric motor is usually positioned perpendicularly to a drive shaft of the insertion tool.
  • the angle grinder can be held and guided using a handle 12 that projects outwardly at an angle.
  • a guard 16 covers insertion tool 14 to the extent that protection against contact by an operator is ensured.
  • Guard 16 is designed as a semicircle with a flange on the periphery, the flange extending downward at the periphery and covering half of the surface and the edge of grinding disc 14 .
  • Guard 16 includes, e.g., a flange 30 projecting upwardly from the center of its imaginary circular area and extending substantially parallel to an axis of rotation 18 , with a clamp 26 attached thereto, and is fixed to a collar 24 by way of said clamp 26 ( FIGS. 2-5 ).
  • a rotation-prevention means 20 is provided according to the present invention that at least limits guard 16 from rotating around an axis of rotation of insertion tool 14 and/or collar 24 .
  • FIGS. 2 through 5 show a first preferred exemplary embodiment of a rotation-prevention means 20 .
  • a blocking means in the form of a stop cam 32 is provided, on the guard side, on a collar 24 of a drive shaft 22 , the blocking means being formed in a clamp 26 for attaching a guard 16 to collar 24 , and which is pressed through toward the inside of clamp 26 ( FIG. 4 ).
  • An insertion groove 36 with a limiting groove 34 extending substantially perpendicular thereto is provided in collar 24 , the limiting groove forming a stop means that corresponds with stop cam 32 .
  • limiting groove 34 limits a possible rotation around an axis of rotation 18 to an angular range a ( FIG. 3 ). The rotation is blocked independently of a torque used to tighten an attachment screw 28 used to fix clamp 26 around collar 24 , the rotation being blocked by one end or the other end of limiting groove 34 .
  • Clamp 26 is shown in greater detail in FIG. 4 .
  • Clamp 26 surrounds a flange 30 that projects outward from guard 16 and fixedly clamps flange 30 of guard 16 to collar 24 of drive shaft 22 .
  • stop cam 32 is guided via insertion groove 36 into limiting groove 34 .
  • Attachment screw 28 is screwed into a screw receptacle 38 .
  • limiting groove 34 extends away from insertion groove 36 in the direction of rotation of insertion tool 14 .
  • Guard 16 can only be rotated, at a maximum, in angular range ⁇ , across which limiting groove 34 extends ( FIG. 3 ).
  • FIG. 5 shows a top view of the arrangement.
  • a suction pipe 44 can also be integrated in guard 16 , suction pipe enabling the extraction of dust produced while working with insertion tool 14 .
  • Stop cam 32 is pressed through on the inside of clamp 26 with which guard 16 is fixed to collar 24 and extends into limiting groove 34 of collar 24 .
  • FIG. 6 A further exemplary embodiment of rotation-prevention means 20 is depicted in FIG. 6 .
  • a blocking lug 40 is formed on guard 16 that is formed out of the sheet metal of guard 16 by being partially punched out and bent.
  • blocking lug 40 can also be welded on, adhesively bonded, or screwed in place.
  • Blocking lug 40 extends outward out of the surface of guard 16 such that it can come in contact with a stop 42 provided on housing 10 .
  • Stop 42 can be formed directly in housing 10 , or it can be welded on, adhesively bonded, or screwed in place. Stop 42 or blocking lug 40 can also be installed as a retrofit.
  • a blocking lug 40 ′ can be created out of a wall of guard 16 oriented perpendicularly to axis of rotation 18 by being partially punched out and bent.
  • Blocking lug 40 hits stop 42 if guard 16 rotates on collar 24 in the direction of rotation.
  • Guard 16 can be mounted on collar 24 using a common clamp 26 .
  • Clamp 26 can also be equipped with a rotation-prevention means 20 according to the present invention, of the type described with reference to the preceding figures.
  • guard 16 can be installed such that blocking means 32 , 40 are both positioned as closely adjacent to stop means 34 , 42 as possible. As a result, guard 16 can be prevented from rotating on collar 24 , the rotation being induced when insertion tool 14 shatters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US10/552,225 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool Abandoned US20060286910A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/797,663 US8011997B2 (en) 2003-10-17 2010-06-10 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10348395A DE10348395A1 (de) 2003-10-17 2003-10-17 Schutzhaube für eine Elektrowerkzeugmaschine, Elektrowerkzeugmaschine sowie System mit Schutzhaube und Elektrowerkzeugmaschine
DE10348395.0 2003-10-17
PCT/DE2004/001716 WO2005044514A1 (de) 2003-10-17 2004-07-30 Schutzhaube für eine elektrowerkzeugmaschine, elektrowerkzeug­maschine sowie system mit schutzhaube und elektrowerk zeugmaschine

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/797,663 Continuation US8011997B2 (en) 2003-10-17 2010-06-10 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

Publications (1)

Publication Number Publication Date
US20060286910A1 true US20060286910A1 (en) 2006-12-21

Family

ID=34442056

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/552,225 Abandoned US20060286910A1 (en) 2003-10-17 2004-07-30 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool
US12/797,663 Expired - Fee Related US8011997B2 (en) 2003-10-17 2010-06-10 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/797,663 Expired - Fee Related US8011997B2 (en) 2003-10-17 2010-06-10 Guard for an electric machine tool, electric machine tool, and system comprising a guard and electric machine tool

Country Status (5)

Country Link
US (2) US20060286910A1 (de)
EP (2) EP2962809B1 (de)
CN (1) CN1867425B (de)
DE (1) DE10348395A1 (de)
WO (1) WO2005044514A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2204262A1 (de) * 2007-10-22 2010-07-07 Makita Corporation Stopper eines radschutzes bei einer schleifmaschine
US20100304648A1 (en) * 2007-11-27 2010-12-02 Cornelius Boeck Hand-held power tool
US20100323595A1 (en) * 2008-02-25 2010-12-23 Attila Nagy Hand-held power tool, in particular hand-guided grinding machine
US20120108154A1 (en) * 2010-11-02 2012-05-03 Makita Corporation Disc grinders
US20160176007A1 (en) * 2013-08-02 2016-06-23 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Assembly having a handheld power tool and a roughing disk
US20160214349A1 (en) * 2015-01-26 2016-07-28 Dyi-chung Hu Wafer reconfiguration
US9878415B1 (en) * 2014-07-22 2018-01-30 Durell Laboratories, Inc. Portable ski and snowboard edge sharpener
US10905938B2 (en) * 2014-07-22 2021-02-02 Durell Laboratories, Inc. Portable ski and snowboard edge sharpener and method of using the same

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005063017B4 (de) 2005-12-30 2019-05-16 Robert Bosch Gmbh Handgeführtes Elektrowerkzeug mit einer Schutzhaube
DE102006053305A1 (de) * 2006-11-13 2008-05-15 Robert Bosch Gmbh Handwerkzeugmaschine mit Schutzhaube, insbesondere Winkelschleifer
DE102008023324A1 (de) 2008-05-13 2009-11-19 Aeg Electric Tools Gmbh Schutzhaube für ein Elektrowerkzeug, insbesondere einen Winkelschleifer sowie Elektrowerkzeug mit einer derartigen Schutzhaube
JP2010274404A (ja) * 2009-06-01 2010-12-09 Makita Corp ディスクグラインダにおける砥石カバーの固定具脱落防止構造
US9542203B2 (en) 2010-12-06 2017-01-10 Microsoft Technology Licensing, Llc Universal dock for context sensitive computing device
US8923770B2 (en) 2010-12-09 2014-12-30 Microsoft Corporation Cognitive use of multiple regulatory domains
US8792429B2 (en) 2010-12-14 2014-07-29 Microsoft Corporation Direct connection with side channel control
US9294545B2 (en) 2010-12-16 2016-03-22 Microsoft Technology Licensing, Llc Fast join of peer to peer group with power saving mode
US8948382B2 (en) 2010-12-16 2015-02-03 Microsoft Corporation Secure protocol for peer-to-peer network
US8971841B2 (en) * 2010-12-17 2015-03-03 Microsoft Corporation Operating system supporting cost aware applications
DE102012214834A1 (de) * 2012-08-21 2014-02-27 Robert Bosch Gmbh Schutzhaubenvorrichtung
EP3546124A1 (de) * 2018-03-29 2019-10-02 HILTI Aktiengesellschaft Winkelschleifgerät
US11358267B2 (en) * 2019-09-11 2022-06-14 Textron Innovations Inc. Tool guard
DE102023106280A1 (de) 2023-03-14 2024-09-19 Andreas Stihl Ag & Co. Kg Arbeitsgerät

Citations (7)

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US4059930A (en) * 1975-07-30 1977-11-29 The Black And Decker Manufacturing Company Removable guard arrangement for a power tool having a rotating head for performing work on a workpiece
US4574532A (en) * 1983-10-27 1986-03-11 C. & E. Fein Gmbh & Co. Protective-hood fastening for portable angled grinders
US4924635A (en) * 1987-12-24 1990-05-15 C. & E. Feini GmbH & Co. Portable grinder with adjustable protective hood
US5005321A (en) * 1986-10-28 1991-04-09 Robert Bosch Gmbh Protective hood for grinding machines, particularly angle grinders, and suitable fastening receptacle for the latter
US5386667A (en) * 1991-04-26 1995-02-07 Robert Bosch Gmbh Portable machine tool
US5766062A (en) * 1996-06-13 1998-06-16 Atlas Copco Tools Ab Portable power tool
US6464573B1 (en) * 2000-06-30 2002-10-15 Porter-Cable Corporation Guard attachment system with knurled clamp ring

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US5163252A (en) * 1990-11-05 1992-11-17 Northwestern Equipment & Supply Co. Adjustable shield for a dynamic tool
DE4239367A1 (de) 1992-11-24 1994-05-26 Bosch Gmbh Robert Handgeführtes Elektrowerkzeug, insbesondere Winkelschleifmaschine
DE19834839C2 (de) * 1998-08-01 2002-04-11 C & E Fein Gmbh & Co Kg Schleifmaschine mit einer abnehmbaren Schutzhaube
DE19946364B4 (de) * 1999-09-28 2008-09-18 Metabowerke Gmbh Schutzhaubenanordnung an einem Winkelschleifer
DE10259520A1 (de) * 2002-12-19 2004-07-01 Robert Bosch Gmbh Elektrohandwerkzeugmaschine
DE10316182A1 (de) * 2003-04-09 2004-10-28 Robert Bosch Gmbh Handschleifmaschine mit Schutzhaube
DE10336873B4 (de) * 2003-08-11 2007-09-20 Hilti Ag Schutzhaubenanordnung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4059930A (en) * 1975-07-30 1977-11-29 The Black And Decker Manufacturing Company Removable guard arrangement for a power tool having a rotating head for performing work on a workpiece
US4574532A (en) * 1983-10-27 1986-03-11 C. & E. Fein Gmbh & Co. Protective-hood fastening for portable angled grinders
US5005321A (en) * 1986-10-28 1991-04-09 Robert Bosch Gmbh Protective hood for grinding machines, particularly angle grinders, and suitable fastening receptacle for the latter
US4924635A (en) * 1987-12-24 1990-05-15 C. & E. Feini GmbH & Co. Portable grinder with adjustable protective hood
US5386667A (en) * 1991-04-26 1995-02-07 Robert Bosch Gmbh Portable machine tool
US5766062A (en) * 1996-06-13 1998-06-16 Atlas Copco Tools Ab Portable power tool
US6464573B1 (en) * 2000-06-30 2002-10-15 Porter-Cable Corporation Guard attachment system with knurled clamp ring

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2204262B1 (de) * 2007-10-22 2014-08-13 Makita Corporation Stopper eines radschutzes bei einer schleifmaschine
EP2204262A1 (de) * 2007-10-22 2010-07-07 Makita Corporation Stopper eines radschutzes bei einer schleifmaschine
US20100304648A1 (en) * 2007-11-27 2010-12-02 Cornelius Boeck Hand-held power tool
US8500521B2 (en) * 2007-11-27 2013-08-06 Robert Bosch Gmbh Hand-held power tool
US20100323595A1 (en) * 2008-02-25 2010-12-23 Attila Nagy Hand-held power tool, in particular hand-guided grinding machine
US8512104B2 (en) * 2008-02-25 2013-08-20 Robert Bosch Gmbh Hand-held power tool, in particular hand-guided grinding machine
US20120108154A1 (en) * 2010-11-02 2012-05-03 Makita Corporation Disc grinders
US9102032B2 (en) * 2010-11-02 2015-08-11 Makita Corporation Disc grinders
US20160176007A1 (en) * 2013-08-02 2016-06-23 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Assembly having a handheld power tool and a roughing disk
US9751185B2 (en) * 2013-08-02 2017-09-05 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Assembly having a handheld power tool and a roughing disk
US9878415B1 (en) * 2014-07-22 2018-01-30 Durell Laboratories, Inc. Portable ski and snowboard edge sharpener
US10905938B2 (en) * 2014-07-22 2021-02-02 Durell Laboratories, Inc. Portable ski and snowboard edge sharpener and method of using the same
US20160214349A1 (en) * 2015-01-26 2016-07-28 Dyi-chung Hu Wafer reconfiguration
US9545776B2 (en) * 2015-01-26 2017-01-17 Dyi-chung Hu Wafer reconfiguration
US10964580B2 (en) 2015-01-26 2021-03-30 Dyi-chung Hu Wafer reconfiguration during a coating process or an electric plating process

Also Published As

Publication number Publication date
US8011997B2 (en) 2011-09-06
EP1677948A1 (de) 2006-07-12
CN1867425B (zh) 2013-07-31
EP2962809A1 (de) 2016-01-06
DE10348395A1 (de) 2005-05-19
CN1867425A (zh) 2006-11-22
US20100248599A1 (en) 2010-09-30
EP2962809B1 (de) 2019-06-12
EP1677948B1 (de) 2016-09-07
WO2005044514A1 (de) 2005-05-19

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VOIGT, MIKE;KLEIDER, ALBERT;NEEF, KURT;REEL/FRAME:018128/0409;SIGNING DATES FROM 20050901 TO 20050905

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION