EP2291264B1 - Machine-outil, notamment machine-outil portative - Google Patents

Machine-outil, notamment machine-outil portative Download PDF

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Publication number
EP2291264B1
EP2291264B1 EP09765664.9A EP09765664A EP2291264B1 EP 2291264 B1 EP2291264 B1 EP 2291264B1 EP 09765664 A EP09765664 A EP 09765664A EP 2291264 B1 EP2291264 B1 EP 2291264B1
Authority
EP
European Patent Office
Prior art keywords
power tool
clamping
clamping band
tool according
band
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.)
Not-in-force
Application number
EP09765664.9A
Other languages
German (de)
English (en)
Other versions
EP2291264A1 (fr
Inventor
Joerg Maute
Florian Esenwein
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 EP2291264A1 publication Critical patent/EP2291264A1/fr
Application granted granted Critical
Publication of EP2291264B1 publication Critical patent/EP2291264B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • 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 invention relates to a machine tool, in particular a hand tool, such as an angle grinder, according to the preamble of claim 1.
  • the DE 102 59 520 A1 discloses an electric hand tool with a disc-shaped, rotating tool, which is overlapped by a protective hood, which is fastened by means of a clamp on a clamping neck of the machine tool.
  • the clamp has radially projecting end portions which are held together by a screw, with increasing screwing the screw, the clamp is further tensioned and exerts a radial clamping force on the clamping neck of the machine tool.
  • the clamp is provided with a locking member which is articulated on the outside of the clamp band and having a locking member which protrudes through a recess in the clamp band and engages latching in a toothing on the outer surface of the clamping neck.
  • the catch component is to be manually pivoted between the latching and the non-latching position.
  • the positive connection which is set via the locking component, prevents rotation of the guard on the clamping neck, whereby the safety is improved, in particular in the event of tool breakage.
  • the DE 10 2007 041 840 A1 discloses an angle grinder with a protective cover which is to be fastened on a clamping neck of the angle grinder with the aid of a tension band.
  • the tension band extends over an angular range of slightly more than 270 °, wherein the remaining angle portion is bridged by a rocker which is pivotally supported on a hinge of the tension band. To attach a screw is screwed into a threaded section on the rocker.
  • the invention has for its object to make a machine tool, in particular a hand tool, with respect to the attachment of their guard to the effect that can be realized even with short travel for the user a simple and secure structure.
  • the diameter of the clamping band can also be widened with little manual effort, so that the clamping band as a whole, including optionally arranged thereon locking elements or latching means can be brought into the release position.
  • a preferred embodiment are accordingly preferably on the pivot portion, but possibly also on the supporting part of this strap additional locking means to provide or to actuate such locking means on the pivot portion and / or this supporting part of the clamping band, said locking means quickly and safely into the locking position or the emergency stop position can be transferred.
  • the machine tool, against the clamping neck of the protective cover is to be determined by means of the clamping band is circumferentially provided on the clamping neck expediently with a circumferentially extending teeth.
  • This toothing is used to engage the locking band provided on the tensioning band, in particular on the pivoting portion of the tensioning band, when the tensioning band is tensioned.
  • a groove extending in the circumferential direction is additionally introduced on the clamping neck, which preferably serves for axial securing by a pin or pin or the like, which is formed on the clamping band or on the guard, engages in this circumferential groove.
  • Possible is both a separate execution of the circumferential groove and extending in the circumferential direction toothing and a coupled embodiment in which the toothing extends with the individual circumferentially successive tooth-shaped recesses starting directly from the circumferential groove in the axial direction.
  • the protective hood according to the invention is used for a machine tool, in particular a hand-held power tool such as an angle grinder, wherein the protective cover rotates stored tool of the machine tool overlaps and attach by means of a fastening device to a clamping neck of the machine tool.
  • the fastening device has a clamping band to be laid around the clamping neck, which is to be tensioned by means of an actuating element.
  • a portion of the clamping collar to be laid around the clamping neck is designed as a pivoting section, which is held pivotably in relation to an adjacent section on the clamping band. With the release of the actuating element of the pivoting portion of the clamping band is to be converted into a radially pivoted position.
  • the pivoting portion is located on the inside of the clamping band, in particular in the region of the pivot portion at least one locking element, which rests with tensioned tensioning strap on the clamping neck and preferably engages positively in an associated recess on the outside of the clamping neck.
  • the radially inwardly extending latching element is automatically transferred to the pivoting of the pivoting portion in the non-latching position.
  • the pivoting portion is pivoted from a pivoted position into a position approximating the clamping neck for fastening the protective hood, whereby at the same time the locking elements on the inside of the pivoting portion reach the locking position.
  • the pivoting of the pivot portion is expediently so far pronounced that the locking elements are on the inside in the pivoted state in the non-latching position.
  • the tensioned state which also marks the locking position, however, takes the pivot portion expediently the same curvature as the adjacent clamping band sections, so that the clamping band including pivot portion has a circular shape.
  • a locking element on a portion of the clamping band outside the pivot portion.
  • This locking element or the locking elements may be additionally or alternatively provided to the locking element on the pivoting portion.
  • the transfer of the pivoting portion in the pivoted position takes place by acting on the actuating element.
  • the head or the free end of the screw is located on a component of the pivot portion and adjusted the pivot portion either active in the pivoted position or allows pivoting by spring force, in the latter case, the actuator is not active in the swing section in the pivoted state transferred, but holds the pivot portion against the force of the spring element in the cocked position.
  • the transfer of the actuating element in the relaxed position is thus either actively or passively transferred the pivot portion of the actuating element in the pivoted position.
  • the component on the pivoting portion, which is acted upon by the actuating element, according to the invention is designed as a hold-down, wherein the actuating element when releasing the hold-down acts on the pivot portion in such a manner that the pivoting portion is transferred to a radially pivoted position.
  • the hold-down may extend radially outward on the tension band, but is also possible a version with additional tangential component.
  • the screw presses against the hold-down and thereby acts on the pivoting portion in the expanded position.
  • the pivot portion is spring loaded in the expanded position, wherein in the fastened state, the screw acts on the hold-down and thereby secures the pivot portion in the pivoted position.
  • the pivoting portion With the release of the screw, the pivoting portion can swing outward under the action of the spring force.
  • the spring force is generated either via a separate spring element, which may for example be arranged in the joint of the pivot portion, or by the residual stress of the pivot portion, which can be achieved, for example, by a corresponding embossing of the joint connecting the pivot portion with the remaining portions of the tension band.
  • the joint is preferably designed in the manner of a film hinge as a section with reduced wall thickness in the clamping band or by an impression that allows pivoting of the pivoting portion.
  • a protective hood which also forms a replacement and / or retrofit component as a functional unit with its fastening device, can also be used in many machine tools - at least without much adaptation effort - in exchange for protective hoods of a different design.
  • the invention also relates to the tension band as such that is provided in particular for fixing the guard on the clamping neck of the machine tool and this fast, easy, safe and possibly lockable with little effort and easy for the user operation allows that it has a swing-out peripheral portion as a pivot portion, which is acted upon by the actuating element and which is pivotable in a radially pivoted release position, said pivoting is actively accessible via the actuating element or, after release by the actuating element also passively via a spring arrangement or the like.
  • Fig. 1 shows a protective hood 1, which is attached to a machine tool, in particular to a power tool such as an angle grinder.
  • a fastening device 5 which surrounds a cylindrical, integrally formed with the main body of the protective cover 1 collar 4, which on a clamping neck of the machine tool is postponed.
  • a bearing 3 for rotatably supporting the tool.
  • the fastening device 5 for fastening the protective cover 1 on the clamping neck 2 comprises a clamping band 6, which is designed as a clamp and is to be tensioned by a screw 10.
  • the screw 10 forms an actuating element for tensioning and loosening the tensioning band 6 and is guided through end-side, radially projecting end portions 6a and 6b of the tensioning band, which are each provided with recesses through which the screw is passed.
  • the screw is secured by a nut on the strap.
  • the longitudinal axis of the screw 10 extends relative to the clamping band 6 in the closed state in the tangential direction.
  • the tension band 6 has a pivoting portion 7, which is part of the tension band and extends over an angular segment of the tension band and is placed around the tension neck 2 of the machine tool.
  • the pivoting portion 7 is connected via a rotary or pivot joint 9 with an immediately adjacent portion 8 of the clamping band, wherein the hinge 9 has an axis of rotation which is parallel to the axis of rotation of the tool.
  • the hinge 9 allows the pivot portion 7 to pivot about the hinge to a radially expanded position.
  • Fig. 1 the tensioning band 6 is shown in the cocked position, in which the screw 10 is tightened so far that the clamping band 6 is tightened around the clamping neck 2 and exerts a radial clamping force on the clamping neck, via which the protective hood is connected to the clamping neck.
  • two radially inwardly directed locking elements 11 are arranged, which lie in the tensioned state of the clamping band 6 in a latching position with associated recesses in the lateral surface of the clamping neck 2.
  • a latching fuse which acts in the circumferential direction and expediently also in the axial direction.
  • a further latching element 14 is arranged on the inside of the clamping band 6 outside of the pivoting portion 7. This additional locking element 14 is used in particular for axial securing on the clamping neck.
  • a radially projecting hold-down 12 with which the head of the screw 10 is in contact.
  • the hold-down 12 has the task to support the Aufschwenkiolo the pivot portion when loosening the screw 10.
  • Fig. 2 the fastening device 5 is shown in the released state, in which the pivoting portion 7 is pivoted radially about its hinge 9, so that the pivot portion 7 is at a radial distance from the inner diameter 13, which is enclosed by the clamping band 6 in the tensioned state.
  • the head of the screw presses against the hold-down 12. Since the hold-down 12 is arranged at a distance from the axis of the joint 9 on the pivot portion 7, by the contact between the screw and hold-down and unscrewing the Screw from the end-side end portions 6a and 6b of the clamping band 6 of the pivot portion 7 pivoted about its hinge 9.
  • the hinge 9 between the pivot portion 7 and the adjacent portion 8 of the tension band 6 can be prepared in a simple mechanical manner, characterized in that the end portion of the pivot portion 7 is bent over a hook and engages around a journal, which at the associated, end face of the section 8 formed or is arranged.
  • the spring element may be formed integrally with the tension band 6, for example, in that the joint 9 is formed only as a tapered wall portion or as an impression in the tension band and the pivot portion 7, a bias is applied. But it is possible to form the spring element as a separate component, which is arranged for example in the region of the joint 9 and the force applied to the pivoting portion in one of its end positions.
  • the tension band 6 is also equipped with a radially swing-pivoting portion 7, which is rotatably connected via the hinge 9 with the adjacent portion 8 of the tension band.
  • the front end portions 6a and 6b are not formed as a radial projection, but as circumferentially extending and overlapping portions which are held together by the screw 10, wherein the screw 10 extends in the radial direction.
  • the hold-down 12 abuts the head of the screw 10 and extends on the outside of the pivot portion 7 with a radial component and a component in the circumferential direction.
  • the free end face of the blank holder 12 is located on the head of the screw 10, so that with the loosening of the screw 10 of the hold-down is bent back and thereby creates a force that leads together with the distance to the hinge 9 to a aufschwenkenden moment.
  • the embodiment according to Fig. 4 illustrates a combination of the embodiments Fig. 1 and Fig. 3 at Fig. 4 are the front end portions of the clamping band 6 radially projecting, wherein in this area the screw 10 is guided as an actuating element by recesses in the end portions and holds them together with a clamping force.
  • the hold-down 12, the free end face rests on the head of the screw 10 is formed in a similar manner as in the embodiment 3 and extends on the outside of the pivot portion 7 with a component in both the radial direction and in the circumferential direction.
  • a bearing flange 19 of the machine tool comprising a base plate 20 and the integrally formed with the base plate clamping neck 2, in which the bearing 3 is received for the drive spindle 4.
  • a toothing 21 is introduced, consisting of a plurality extending in the axial direction and distributed over the circumference tooth-shaped depressions, which are associated with the locking element of the locking member, wherein the locking element protrudes in the latching position in each case a tooth-shaped recess.
  • the tooth-shaped depressions each extend axially from a circumferential groove 22, which extends over the entire circumference of the clamping neck 2.
  • the locking element of the locking member can be moved.
  • a detent element separately formed component such as a pin or the like in the circumferential groove and thereby secures the clamp and the protective cover in the axial direction on the clamping neck.
  • the toothing 21 is formed separately from the circumferential groove 22.
  • the toothing 21 is adjacent to the top of the base plate 20, the circumferential groove 22, however, adjacent to the end face of the clamping neck 2.
  • a separately formed by the locking member component protrudes into the circumferential groove 22, such as a pin or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Clamps And Clips (AREA)

Claims (13)

  1. Machine-outil, notamment machine-outil portative, comme par exemple une meuleuse d'angle, comprenant un capot de protection (1) qui doit être fixé sur un collier de serrage (2) de la machine-outil par le biais d'une bande de serrage (6) devant être placée autour du collier de serrage (2) et devant être tendue par le biais d'un élément d'actionnement (10), laquelle bande de serrage comprend une portion pivotante (7) sollicitée par le biais de l'élément d'actionnement (10), laquelle portion pivotante peut être pivotée dans une position pivotée radialement vers l'extérieur, la portion pivotante (7) étant maintenue de manière mobile en pivotement sur une portion (8) adjacente de la bande de serrage (6), la portion pivotante (7) étant sollicitée lors du desserrement par l'élément d'actionnement (10) réalisé sous forme de vis (10) et pouvant passer à la position pivotée radialement vers le haut, caractérisée en ce qu'une partie structurale sur la portion pivotante (7) est réalisée sous forme d'élément de retenue (12) et est sollicitée par la vis (10), la vis (10) sollicitant, lors du desserrement, l'élément de retenue (12) sur la portion pivotante (7) de telle sorte que la portion pivotante (7) passe à une position pivotée radialement vers le haut.
  2. Machine-outil selon la revendication 1,
    caractérisée en ce que le collier de serrage (2) de la machine-outil comprend une denture (21) s'étendant dans la direction périphérique, dans laquelle denture vient en prise un élément d'encliquetage (11) de la portion pivotante (7) dans la position d'encliquetage.
  3. Machine-outil selon la revendication 1 ou 2,
    caractérisée en ce qu'une rainure périphérique (22) est prévue sur le collier de serrage (2).
  4. Machine-outil selon la revendication 3,
    caractérisée en ce que des évidements en forme de dents s'étendant dans la direction axiale sont ménagés dans la surface d'enveloppe du collier de serrage (2), à partir de la rainure périphérique (22) sur le collier de serrage (2).
  5. Machine-outil selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce qu'au moins un élément d'encliquetage (11) est disposé sur le côté intérieur de la portion pivotante (7) sur la bande de serrage (6), lequel élément d'encliquetage s'applique contre le collier de serrage (2) lorsque la bande de serrage (6) est tendue.
  6. Machine-outil selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que, lors du desserrement, l'élément d'actionnement (10) sollicite l'élément de retenue (12) avec un composant élargissant radialement la portion pivotante (7).
  7. Machine-outil selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que l'élément de retenue (12) s'étend radialement vers l'extérieur sur la bande de serrage (6).
  8. Machine-outil selon l'une quelconque des revendications 1 à 7,
    caractérisée en ce que l'élément de retenue (12) s'étend sur la bande de serrage (6) avec un composant tangentiel.
  9. Machine-outil selon l'une quelconque des revendications 1 à 8,
    caractérisée en ce que la vis (10) est guidée par des portions d'extrémité (6a, 6b) élargies radialement de la bande de serrage (6) et s'étend au moins essentiellement tangentiellement par rapport à la bande de serrage (6).
  10. Machine-outil selon l'une quelconque des revendications 1 à 8,
    caractérisée en ce que la vis (10) s'étend radialement par rapport à la bande de serrage (6) et relie des portions d'extrémité (6a, 6b) en chevauchement de la bande de serrage (6) dans la position tendue.
  11. Machine-outil selon l'une quelconque des revendications 1 à 10,
    caractérisée en ce que la portion pivotante (7) est reliée de manière articulée à la portion (8) adjacente de la bande de serrage (6) par le biais d'une articulation pivotante (9).
  12. Machine-outil selon la revendication 11,
    caractérisée en ce que l'articulation pivotante (9) est réalisée sous la forme d'une partie structurale autonome qui est maintenue sur la bande de serrage (6).
  13. Machine-outil selon la revendication 11,
    caractérisée en ce que l'articulation pivotante (9) est réalisée sous forme de portion présentant une épaisseur de paroi réduite.
EP09765664.9A 2008-06-16 2009-04-22 Machine-outil, notamment machine-outil portative Not-in-force EP2291264B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008002451A DE102008002451A1 (de) 2008-06-16 2008-06-16 Werkzeugmaschine, insbesondere Handwerkzeugmaschine
PCT/EP2009/054789 WO2009153084A1 (fr) 2008-06-16 2009-04-22 Machine-outil, notamment machine-outil portative

Publications (2)

Publication Number Publication Date
EP2291264A1 EP2291264A1 (fr) 2011-03-09
EP2291264B1 true EP2291264B1 (fr) 2014-01-15

Family

ID=40863507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09765664.9A Not-in-force EP2291264B1 (fr) 2008-06-16 2009-04-22 Machine-outil, notamment machine-outil portative

Country Status (6)

Country Link
US (1) US20110086583A1 (fr)
EP (1) EP2291264B1 (fr)
CN (1) CN102066051A (fr)
DE (1) DE102008002451A1 (fr)
RU (1) RU2011101499A (fr)
WO (1) WO2009153084A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008002468A1 (de) * 2008-06-17 2009-12-24 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine
DE102011089754A1 (de) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Schutzhaubenverdrehsicherungsvorrichtung
DE102011089758A1 (de) * 2011-12-23 2013-06-27 Robert Bosch Gmbh Schutzhaubenverdrehsicherungsvorrichtung
DE102012210766A1 (de) * 2012-06-25 2014-01-02 Robert Bosch Gmbh System
DE102012210762A1 (de) * 2012-06-25 2014-01-02 Robert Bosch Gmbh Schutzhaubenvorrichtung
EP2897766B1 (fr) * 2012-09-18 2017-08-23 Ingersoll-Rand Company Outils de meulage dotés de protection
DE102017002327B4 (de) * 2016-04-11 2021-05-27 Mann+Hummel Gmbh Filtereinrichtung
WO2018180835A1 (fr) * 2017-03-29 2018-10-04 日東工器株式会社 Outil électrique
CN113237298A (zh) * 2021-05-31 2021-08-10 倪叶杲 一种汽车饰品的烘干装置及其使用方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3126488C2 (de) * 1981-07-04 1983-04-21 Fa. A. Raymond, 7850 Lörrach Rohrschelle
DE3708065A1 (de) * 1987-03-12 1988-09-22 Toni Messer Rohrschelle mit vorher angedrehter schraube
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
DE102007041840A1 (de) * 2006-11-13 2008-05-15 Robert Bosch Gmbh Handwerkzeugmaschine mit Schutzhaube, insbesondere Winkelschleifer

Also Published As

Publication number Publication date
US20110086583A1 (en) 2011-04-14
DE102008002451A1 (de) 2009-12-17
EP2291264A1 (fr) 2011-03-09
WO2009153084A1 (fr) 2009-12-23
RU2011101499A (ru) 2012-07-27
CN102066051A (zh) 2011-05-18

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