EP0583270B1 - Outillage electrique a main - Google Patents

Outillage electrique a main Download PDF

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Publication number
EP0583270B1
EP0583270B1 EP92908809A EP92908809A EP0583270B1 EP 0583270 B1 EP0583270 B1 EP 0583270B1 EP 92908809 A EP92908809 A EP 92908809A EP 92908809 A EP92908809 A EP 92908809A EP 0583270 B1 EP0583270 B1 EP 0583270B1
Authority
EP
European Patent Office
Prior art keywords
collar
locking
catch
nose
spring element
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
EP92908809A
Other languages
German (de)
English (en)
Other versions
EP0583270A1 (fr
Inventor
Friedrich HÄUSSLEIN
Peter RÖHRUP
Egbert STEINBRÜCK
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 EP0583270A1 publication Critical patent/EP0583270A1/fr
Application granted granted Critical
Publication of EP0583270B1 publication Critical patent/EP0583270B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 invention is based on a hand tool, in particular an angle grinder, of the type defined in the preamble of claim 1.
  • the protective hood which is attached to the clamping neck with a through opening is held axially immovably between two locking rings, which are secured by a snap ring which is inserted into an annular groove incorporated in the clamping neck.
  • a lever is non-rotatably fastened to the clamping neck, which engages positively with a nose in bores or grooves in the protective hood.
  • the protective hood can be turned into a desired position around the axis of the clamping neck. After releasing the lever, the nose snaps into another Hole or groove, and the protective hood is fixed in this new rotary position.
  • the handheld power tool according to the invention with the characterizing features of claim 1 has the advantage that the protective hood can be removed from the handheld power tool and used again without using an auxiliary tool.
  • the handling required for this is simple and time-saving.
  • the protective hood After releasing the locking device, the protective hood only needs to be rotated into its plug-on position and can then be pulled off axially from the clamping neck.
  • the protective hood is connected to the handheld power tool in the opposite direction.
  • the connection of the protective hood with the hand tool is structurally much simpler and requires considerably fewer individual parts. Overall, the protective hood with connecting element to the hand tool is less expensive to manufacture, smaller in size and lighter, and overall leads to a lower weight of the hand tool.
  • the one locking member of the locking device is formed on the spring element, specifically as a locking lug projecting axially from the spring element, and the corresponding one Locking member is formed by at least one recess arranged in the end face of the push-on collar facing the spring element, into which recess the locking lug projects in a form-fitting manner.
  • the manual locking device can be implemented very simply and inexpensively by these design measures. If a plurality of equidistantly arranged recesses are provided, which are distributed over part of the circumference of the push-on collar, the protective hood can in each case be fixed non-rotatably in different pivot positions.
  • a locking lug is formed on the spring element and in the end of the push-on collar facing the spring element, locking troughs interacting with the locking lug are arranged equidistantly and are distributed over part of the circumference of the push-on collar.
  • the locking lug and locking lug are preferably arranged diametrically opposite on the spring element, and the arrangement of the recesses and locking troughs is such that when the locking lug engages in a locking trough, the locking lug is aligned with one of the recesses.
  • the spring element according to the invention has a kind of ratchet function, as a result of which the protective hood can only be rotated by fixed angular steps. With each angular step it is ensured that the locking lug can fall into one of the recesses.
  • the motor housing 11 and the gear housing 12 can be seen from the hand-held angle grinder with protective hood 10, which is shown in detail in FIG. 1, as an example of a general hand-held machine tool.
  • a drive spindle 13 protrudes from the gear housing 12 and carries at its free end a receptacle 14 for a grinding or cutting disc, not shown here.
  • the drive spindle 13 is mounted in a bearing flange 15 which is fastened in the gear housing 12, preferably by means of threaded screws, and projects from the gear housing 12 with a reduced diameter neck 151.
  • a radial bearing 16 for the drive spindle 13 is accommodated in the clamping neck 151, and the protective hood 10, which covers half of the grinding or cutting disc, is fastened to the outside on the clamping neck 151.
  • the protective hood 10 carries a sleeve-shaped push-on collar 17, which is pushed onto the clamping neck 151 and engages with radial projections 18 protruding from the inner wall in an annular groove 19 which is formed in the clamping neck 151.
  • the push-on collar 17 is formed by the central part of a bell-shaped sheet metal cap 20 which is in the cap base 201 carries a coaxial opening 21 for the passage of the drive spindle 13 with the receptacle 14 and is permanently connected to the protective hood 10, for example by welding.
  • axial grooves 22 are provided on the clamping neck, which on the one hand open into the annular groove 19 and on the other hand end freely on the end face of the clamping neck 151.
  • the width of the axial grooves 22 is chosen so that the radial projections 18 can slide on the push-on collar 17 in the axial grooves 22.
  • the number of axial grooves 22 corresponds to the number of radial projections 18, wherein, as can be seen in FIG. 2, there are a total of four radial projections 18 resulting from sheet metal stampings.
  • the distance between the axial grooves 22 seen in the circumferential direction from each other corresponds exactly to the distance between the respective radial projections 18, so that when the push-on collar 17 is fitted onto the clamping neck 151, a radial projection 18 can be immersed in an axial groove 22 and axially displaced therein.
  • the arrangement of the axial grooves 22 on the clamping neck 151 is such that the push-on collar 17 can only be attached in a rotational position of the protective hood 10 which does not correspond to the position of use or the positions of use of the protective hood 10.
  • this protective cover 10 is left in the non-use position of the protective hood 10 by rotating the protective hood 10 with a sheet metal cap 20, the radial projections 18 sliding in the annular groove 19.
  • a manually operable locking device 23 is provided for fixing the protective hood 10 in at least one desired position relative to the clamping neck 151. It has a spring element 24 which is non-rotatably attached to the bearing flange 15.
  • the spring element 24 is shown in detail in FIGS. 3 and 4. It is stamped out of spring steel and has a ring 26 which, as can be clearly seen from FIG. 4, on diametrically opposite sides downwards from the Die plane is angled. With the ring 26 four fastening tabs 27 are connected in one piece, which lie in the plane of the spring element 24 and each carry a passage opening 28 for a fastening screw.
  • the spring element 24 rests on the bearing flange 15, the ring 26 surrounding the clamping neck 151 with a radial spacing.
  • the threaded screws are used, with which the bearing flange 15 is fastened to the gear housing 12, so that the fastening tabs 27 form a type of washer for these threaded screws.
  • an actuating button 31 is formed on the ring half 261, which extends axially over the push-on collar 17 to the cap base 201 of the actuating cap 20 when the protective hood 10 is attached.
  • the sheet metal cap 20 carries at its end a radially outwardly protruding collar 202, in which approximately half of its circumference equidistant recesses 32 are punched (see FIG. 2).
  • the width of the recesses 32 corresponds to the width of the locking lug 29 so that it can engage in the recesses 32 in a form-fitting manner in the circumferential direction.
  • Equidistant bead-like recesses 33 are embossed over the other half of the circumference of the collar 202.
  • the distance between the locking troughs 33 from one another corresponds to the distance of the recesses 32 from one another, the locking troughs 33 being such that a locking trough 33 is diametrically opposite a recess 32 due to the diametrical arrangement of the locking lug 29 and locking lug 30.
  • the locking lug 30 engages under spring pressure in the locking troughs 33, so that a type of ratchet is created, by means of which the protective hood 10 after lifting the locking lug 29 out of the associated one Recess 32 can be pivoted by an angle of rotation predetermined by the arrangement of the locking recesses 33.
  • the protective hood 10 described with the push-on collar 17 attached thereto can be attached to the angle grinder or removed from it again without using an auxiliary tool.
  • the protective hood 10 is to be placed on the clamping neck 151 in such a rotational position that the radial projections 18 in the push-on collar 17 are aligned with the axial grooves 22 in the clamping neck 151.
  • the push-on collar 17 is pulled axially onto the clamping neck 151 until the radial projections 18 come to rest in the annular groove 19 in the clamping neck 151.
  • the collar 202 of the push-on collar 17 or the sheet metal cap 20 rests against the two ring halves 261, 262 of the spring element 24 and displaces them in the axial direction, as a result of which the spring element 24, which is supported between the bearing flange 15 and the sheet metal cap 20, is preloaded.
  • the protective hood 10 can be rotated around the clamping neck 151 until it assumes the desired position.
  • the detent 30 which slides in and out of the detent depression 33 defines defined positions of the protective hood 10. If the actuation button 31 is released in such a position, the locking lug 29 is pushed into the respective recess 32 by spring force.
  • the push-on collar 17 and thus the protective hood 10 is fixed in a non-rotatable manner on the clamping neck 151.
  • the clamping hood 10 To remove the clamping hood 10, after lifting the actuation key 31 and the associated unlocking of the protective hood 10, the latter must be turned on the clamping neck 151 until the radial projections 18 are aligned with the axial grooves 22 within the annular groove 19. In this position, the protective hood 10 can be removed axially from the clamping neck 151.
  • the actuation button 31 can be molded as a plastic part onto the spring element 24 made of spring band steel.
  • the entire spring element 24 can, however, also be designed as a plastic part, which is either attached to the bearing flange 15, as described, or is integrally formed on the bearing flange, which is also made of plastic. In the latter case, the fastening tabs 27 are omitted.

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)

Abstract

Un outillage électrique à main, notamment une meuleuse d'angle, comprend une broche d'entraînement (13) qui fait saillie sur le boîtier (12) de la machine et qui porte un raccordement d'outil (14) monté dans une bride de montage (15) pourvue d'un collier de serrage saillant (151). Un élément protecteur (10) qui recouvre au moins partiellement l'outil raccordé à la machine est retenu de manière résistante à la rotation sur le collier de serrage (151). Pour que l'élément protecteur (10) puisse être fixé sur le collier de serrage (151) ou enlevé de celui-ci (151) sans outils auxiliaires, l'élément protecteur (10) porte un col cylindrique (17) à glisser sur le collier de serrage (151) et pourvu de protubérances radiales (18) qui pénètrent dans une rainure annulaire (19) du collier de serrage (151). Des rainures axiales (22) ménagées dans le collier de serrage (151) et qui s'ouvrent dans la rainure annulaire (19) permettent de pousser axialement le col (17) sur le collier de serrage (151) jusqu'à une position de montage décalée en rotation par rapport à la position d'utilisation de l'élément protecteur (10), les protubérances radiales (18) glissant dans les rainures axiales (22). Des éléments correspondant les uns aux autres d'un dispositif de verrouillage (23) à actionnement manuel sont agencés sur le col (17) et sur le collier de serrage (151) afin de bloquer l'élément protecteur (10) dans sa position d'utilisation.

Claims (10)

  1. Outillage électrique à main, notamment meuleuse d'angle, comportant une broche d'entraînement (13) équipée d'un porte-outil et montée sur une bride de palier (15) munie d'un col de serrage (151) une calotte de protection (10) recouvrant au moins en partie l'outil et se trouvant maintenue sans pouvoir tourner sur le col de serrage (151) par un dispositif de verrouillage, dégageable à la main, constitué d'organes (29, 32) se correspondant, portés par le col (151) et la calotte (10), caractérisé en ce que la calotte de protection (10) possède un collet d'emmanchement (17) en forme de douille qui peut être glissé sur le col de serrage (151) pour venir en prise, par des saillies radiales (18), dans une rainure annulaire (19) du col (151) portant lui-même des rainures axiales (22) partant de sa face frontale libre et aboutissant à la rainure (19), ces rainures permettant de donner à la calotte de protection (10) une position d'engagement, décalée en rotation par rapport à la position de travail, dans laquelle les saillies (18) peuvent pénétrer dans les rainures (19), tandis que sur le col (151) et l'entourant à la manière d'un anneau est fixé, sans pouvoir tourner, un élément (24) élastique axialement intercalé en pression entre la bride de palier (15) et la face frontale du collet (17) opposée à la calotte de protection (10), cet élément élastique portant des organes d'arrêt (30) qui, par rotation de la calotte (10), peuvent en glissant s'engager dans ou se dégager des organes (32, 33) de la calotte (10), de sorte que celle-ci peut être bloquée par les organes de verrouillage (29, 32) dans leurs positions d'arrêt.
  2. Outillage électrique à main selon la revendication 1, caractérisé en ce que les organes (29,32)du dispositif de verrouillage (23) qui se correspondent, sont d'une part un organe de verrouillage (29) appartenant à l'élément élastique (24), et d'autre part un organe de verrouillage (32) porté par le collet d'emmanchement (17).
  3. Outillage électrique à main selon la revendication 2, caractérisé en ce qu'un organe de verrouillage du dispositif de verrouillage (23) est constitué par une dent de verrouillage (29) dépassant axialement de l'élément élastique (24), l'autre organe de verrouillage qui lui correspond étant constitué par au moins une encoche (32) creusée dans la face frontale (202) du collet d'emmanchement (17) en regard de l'élément élastique (24) la dent de verrouillage (29) se verrouillant dans l'encoche (32) par combinaison de formes.
  4. Outillage électrique à main selon la revendication 3, caractérisé en ce qu'il est prévu sur le collet d'emmanchement (17) une pluralité d'encoches (32) de préférence équidistantes, sur une partie seulement de sa périphérie.
  5. Outillage électrique à main selon les revendications 2 à 4, caractérisé en ce que l'élément élastique (24) porte une languette de manoeuvre (31) permettant, par soulèvement, de dégager la dent de verrouillage (29) de l'encoche (32).
  6. Outillage électrique à main selon la revendication 5, caractérisé en ce que la languette de manoeuvre (31) est située près de la dent de verrouillage (29) et s'écarte, parallèlement au col de serrage (151), de l'élément élastique (24).
  7. Outillage électrique à main selon l'une des revendications 2 à 6, caractérisé en ce que l'organe d'arrêt porté par l'élément élastique (24) est une dent d'arrêt (30), tandis que les éléments d'arrêt portés par le collet d'emmanchement (17) sur son extrémité (202) en regard de l'élément élastique (24) et coopérant avec la dent d'arrêt (30), sont des parties en creux (33), de préférence réparties régulièrement sur une partie seulement de la périphérie du collet (17).
  8. Outillage électrique à main selon la revendication 7, caractérisé en ce que la dent de verrouillage (29) et la dent d'arrêt (30) portées par l'élément élastique (24) sont diamétralement opposées, la disposition des encoches (32) et des creux d'arrêt (33) étant telle que, lorsqu'une dent (30) est en arrêt dans un creux (33), une des encoches (32) est alignée avec la dent de verrouillage (29).
  9. Outillage électrique à main selon l'une des revendications 7 et 8, caractérisé en ce que l'élément élastique (24) comprend un anneau (26) entourant, à une certaine distance, le col de serrage (151), et fait d'un matériau élastique, par exemple du feuillard élastique en acier, comportant des pattes (27) obtenues par découpage avec l'anneau, servant à sa fixation sur la bride de palier (15), les dents de verrouillage (29) et d'arrêt (30) étant décalées axialement par rapport à la surface de l'anneau (26), les deux moitiés d'anneau (261, 262) portant respectivement les dents (29) et (30), étant écartées du plan des pattes de fixation (27) par pliage.
  10. Outillage électrique à main selon l'une des revendications 1 à 9, caractérisé en ce que le collet d'emmanchement (17) est en une tôle dans laquelle les saillies radiales (18) sont formées par emboutissage.
EP92908809A 1991-04-26 1992-04-24 Outillage electrique a main Expired - Lifetime EP0583270B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4113641 1991-04-26
DE4113641A DE4113641A1 (de) 1991-04-26 1991-04-26 Handwerkzeugmaschine
PCT/DE1992/000332 WO1992019423A1 (fr) 1991-04-26 1992-04-24 Outillage electrique a main

Publications (2)

Publication Number Publication Date
EP0583270A1 EP0583270A1 (fr) 1994-02-23
EP0583270B1 true EP0583270B1 (fr) 1995-07-19

Family

ID=6430399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92908809A Expired - Lifetime EP0583270B1 (fr) 1991-04-26 1992-04-24 Outillage electrique a main

Country Status (6)

Country Link
US (1) US5386667A (fr)
EP (1) EP0583270B1 (fr)
JP (1) JP3447287B2 (fr)
BR (1) BR9205941A (fr)
DE (2) DE4113641A1 (fr)
WO (1) WO1992019423A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008010977A1 (de) 2008-02-25 2009-08-27 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere handgeführte Schleifmaschine
WO2009115143A1 (fr) 2008-03-18 2009-09-24 Robert Bosch Gmbh Machine-outil à main, en particulier meuleuse à main
DE102008000728A1 (de) 2008-03-18 2009-09-24 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere handgeführte Schleifmaschine
DE102008000732A1 (de) 2008-03-18 2009-09-24 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere handgeführte Schleifmaschine
DE102008002548A1 (de) 2008-06-20 2009-12-24 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine

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DE4423889C1 (de) * 1994-07-07 1995-06-22 Atlas Copco Elektrowerkzeuge Schutzhaube für eine Handwerkzeugmaschine
US5637035A (en) * 1995-06-28 1997-06-10 Milwaukee Electric Tool Corporation Adjustable guard arrangement for power tool
DE29513331U1 (de) * 1995-08-19 1996-12-12 Robert Bosch Gmbh, 70469 Stuttgart Winkelschleiferschutzhaube
DE19617572A1 (de) * 1996-05-02 1997-11-13 Bosch Gmbh Robert Elektrische Handschleifmaschine
SE510352C2 (sv) * 1996-05-13 1999-05-17 Electrolux Ab Skyddskåpa vid motordriven handhållen verktygsmaskin
US6464573B1 (en) 2000-06-30 2002-10-15 Porter-Cable Corporation Guard attachment system with knurled clamp ring
DE10257687B4 (de) * 2002-12-10 2006-03-23 Peter Klotz Polierball
DE10336873B4 (de) * 2003-08-11 2007-09-20 Hilti Ag Schutzhaubenanordnung
DE10348395A1 (de) * 2003-10-17 2005-05-19 Robert Bosch Gmbh Schutzhaube für eine Elektrowerkzeugmaschine, Elektrowerkzeugmaschine sowie System mit Schutzhaube und Elektrowerkzeugmaschine
DE102005063017B4 (de) 2005-12-30 2019-05-16 Robert Bosch Gmbh Handgeführtes Elektrowerkzeug mit einer Schutzhaube
DE102006027576A1 (de) * 2006-06-14 2007-12-20 Robert Bosch Gmbh Schutzhauben-Befestigungsvorrichtung
US8172642B2 (en) 2008-08-20 2012-05-08 Black & Decker Inc. Multi-sander
US7736216B2 (en) * 2008-08-20 2010-06-15 Black & Decker Inc. Sander having removable platen
DE102009048357A1 (de) 2009-10-06 2011-04-21 Metabowerke Gmbh Elektrohandwerkzeuggerät
JP5684056B2 (ja) 2010-08-16 2015-03-11 株式会社マキタ 手持ち工具
US9421682B2 (en) 2011-07-18 2016-08-23 Black & Decker Inc. Multi-head power tool with reverse lock-out capability
JP5959421B2 (ja) * 2011-12-14 2016-08-02 株式会社マキタ グラインダ
EP2897766B1 (fr) * 2012-09-18 2017-08-23 Ingersoll-Rand Company Outils de meulage dotés de protection
US9956677B2 (en) 2013-05-08 2018-05-01 Black & Decker Inc. Power tool with interchangeable power heads
WO2015129359A1 (fr) * 2014-02-28 2015-09-03 日立工機株式会社 Outil électrique
US9475172B2 (en) * 2014-07-15 2016-10-25 Milwaukee Electric Tool Corporation Adjustable guard for power tool
USD744800S1 (en) 2014-07-16 2015-12-08 Milwaukee Electric Tool Corporation Power tool blade guard

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008010977A1 (de) 2008-02-25 2009-08-27 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere handgeführte Schleifmaschine
US8512104B2 (en) 2008-02-25 2013-08-20 Robert Bosch Gmbh Hand-held power tool, in particular hand-guided grinding machine
WO2009115143A1 (fr) 2008-03-18 2009-09-24 Robert Bosch Gmbh Machine-outil à main, en particulier meuleuse à main
DE102008000728A1 (de) 2008-03-18 2009-09-24 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere handgeführte Schleifmaschine
DE102008000732A1 (de) 2008-03-18 2009-09-24 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere handgeführte Schleifmaschine
WO2009115142A1 (fr) 2008-03-18 2009-09-24 Robert Bosch Gmbh Machine-outil à main, en particulier meuleuse à main
DE102008002548A1 (de) 2008-06-20 2009-12-24 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine
RU2501640C2 (ru) * 2008-06-20 2013-12-20 Роберт Бош Гмбх Технологическая машина, прежде всего ручная машина
DE102008002548B4 (de) 2008-06-20 2021-11-11 Robert Bosch Gmbh Werkzeugmaschine, insbesondere Handwerkzeugmaschine

Also Published As

Publication number Publication date
DE4113641A1 (de) 1992-10-29
EP0583270A1 (fr) 1994-02-23
US5386667A (en) 1995-02-07
JPH06506638A (ja) 1994-07-28
DE59202970D1 (de) 1995-08-24
BR9205941A (pt) 1994-06-21
WO1992019423A1 (fr) 1992-11-12
JP3447287B2 (ja) 2003-09-16

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