EP0322626B2 - Power grinder with an adjustable protecting hood - Google Patents

Power grinder with an adjustable protecting hood Download PDF

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Publication number
EP0322626B2
EP0322626B2 EP88120765A EP88120765A EP0322626B2 EP 0322626 B2 EP0322626 B2 EP 0322626B2 EP 88120765 A EP88120765 A EP 88120765A EP 88120765 A EP88120765 A EP 88120765A EP 0322626 B2 EP0322626 B2 EP 0322626B2
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EP
European Patent Office
Prior art keywords
protective hood
locking
hand grinder
grinder according
holding part
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EP88120765A
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German (de)
French (fr)
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EP0322626A2 (en
EP0322626A3 (en
EP0322626B1 (en
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C&E Fein GmbH and Co
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C&E Fein GmbH and Co
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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 relates to an angle grinder with a grinder housing comprising a motor housing and a gear housing, in which a grinding spindle is rotatably mounted, with a protective hood for a tool, which is rotatably mounted on a clamping neck by means of a holding part and can be fixed thereon, a locking part in the Area of the clamping neck is held in a rotationally fixed manner, the fixing part or the holding part having at least one and the other part in each case a plurality of locking elements which can be locked together and are loaded by a spring member and which can be released from one another against the spring force, and wherein a lever is provided for actuation.
  • Such a grinding machine is known from EP-A-0 126 641.
  • a further hand grinder in which the protective hood is rotatably mounted on the clamping neck and is held with axial play, whereby to compensate for this play, a resilient element biased in the axial direction is used, which has a fastening ring of the protective cover presses against a shoulder surface on the clamping neck. As a result, the protective hood is secured against twisting by friction locking.
  • Another hand grinder is known from EP-A-0 143 251, in which the protective hood is detachably fastened on the spindle neck of the gear housing by means of a clamp and a fastening screw.
  • a securing element is provided in the region of the end face of the spindle neck, which protrudes beyond the outside diameter of the spindle neck and the inside diameter of the clamping clamp.
  • This securing element can be designed as a flat disc and fastened with a screw on the end face of the clamping neck.
  • the securing element can be designed as a spring-loaded lever and can be pivotably mounted on the spindle neck.
  • a stationary machine tool in which a protective hood for a rotating tool is provided, which can be fixed to a rear plate of the machine housing via a ring rigidly connected thereto.
  • Various circumferential recesses in the ring are used for the connection, through which bolts can be inserted into the rear plate.
  • a spring-loaded pin is provided, which can be snapped into one of the recesses on the circumference of the ring.
  • the invention has for its object to improve a grinding machine of the type mentioned in such a way that a simple and ergonomically favorable adjustment of the protective hood is made possible.
  • the locking elements are locking recesses provided on one part and locking bodies provided on the other part, in which case the locking bodies can engage in the locking recesses.
  • the locking recesses are bores, while in the simplest case the locking body is a pin that engages in these bores.
  • a very easy to implement implementation of the invention provides that a locking body and several locking recesses are provided, the single locking body is then arranged on the holding or locking part and the locking recesses on the other part.
  • the holding part is designed as a ring surrounding the clamping neck, which is preferably integrally formed on the protective hood.
  • the locking part can be a ring enclosing the clamping neck.
  • the spring member is an annular element enclosing the clamping neck, with which the respective tiltable part is placed against a shoulder.
  • FIG. 1 An angle grinder shown in FIG. 1, designated as a whole by 1, shows a motor housing 2 and a gear housing 3.
  • a grinding spindle 4 protrudes from the gear housing 3 and carries a clamping flange 5 at its end.
  • a grinding wheel 6 is placed on this clamping flange 5 and clamped against the clamping flange 5 by a counter flange 7 of a screw that can be screwed into the grinding spindle 4.
  • the grinding wheel 6 is partially covered by a protective hood designated as a whole, which is rotatably mounted on a clamping neck 9 which surrounds the grinding spindle 4 between the counter flange 5 and the gear housing 3 and is mounted on the gear housing 3.
  • the clamping neck 9 is successive in a total of three sections 10 to 12 coaxial to the grinding spindle 4, starting from the gear housing divided smaller outer diameter. Between these circular cylindrical sections 10 to 12, annular contact surfaces 13 and 14 are thereby formed in planes perpendicular to the axis of rotation of the grinding spindle 4.
  • the first circular-cylindrical section lying adjacent to the gear housing 3 is surrounded by a spring element 15 which, on the one hand, is located on a gear housing 3 which is formed and is perpendicular to the axis of rotation of the grinding spindle 4
  • Surface 16 is supported and, on the other hand, bears against a ring 17, likewise surrounding the first circular cylindrical section 10, of a locking element designated as a whole as 18. which also has a lever arm 19 molded onto the ring 17, which extends in an intermediate space between the protective hood 8 and the motor housing 2.
  • the ring 17 is pressed by the spring element 15 against an intermediate ring 20 seated on the second circular-cylindrical section 11, which in turn bears against the contact surface 13 between the circular-cylindrical section 10 and the smaller-diameter circular-cylindrical section 11.
  • the intermediate ring 20 is in turn held by a fixing ring 21 which sits on the third circular cylindrical section 12 and bears against the contact surface 14.
  • This fixing ring 21 is held by a snap ring 22 which engages in a circumferential groove 23, machined into the third circular-cylindrical section 12.
  • the intermediate ring 20 is provided on its side facing the fixing ring 21 with a radially outward opening and an annular recess 24 open to the fixing ring 21, in which an annular holding part 25 of the protective hood 8 can be rotated coaxially to the grinding spindle 4, but in is axially fixed.
  • This holding part 25 has holes 26 arranged at the same angular distance on a circular arc segment. One of these bores 26 engages with a pin 27 arranged on the fixing part 18 in the region of the transition between the ring 17 and the lever arm 19, which extends from the fixing part 18 through a recess 28 in the intermediate ring 20 to the holding part 25.
  • the ring 17 is held on the first circular cylindrical section 10 with play so that it can be displaced in the direction of the gear housing 3 in the axial direction of the grinding spindle 4 against the action of the spring element 15, which is, for example, a wave spring or a rubber ring .
  • the spring element 15 which is, for example, a wave spring or a rubber ring .
  • the protective hood 8 which is rotatably mounted with the holding part 25 in the intermediate ring 20, can be freely rotated around the clamping neck 9.
  • the pin 27 is moved again in the direction of the holding part 25 by the spring element 15, so that he now comes into engagement with the opposite bore 26 and fixes the holding part 25 with the protective hood 8 in a rotationally fixed manner on the clamping neck 9. This is done in that the pin 27 is fixed non-rotatably on the clamping neck 9 through the recess 28.
  • the walls of the bores 26 are shaped such that the pin 27 cannot jump out of the bores 26 even when there is strong lateral pressure on the protective hood 8. Furthermore, in order to be able to lock the protective hood 8 in all conceivable rotational positions, it is provided that the bores 26 are provided on the holding part 25 in a large circumferential area, all of which lie with their center on a circular path segment concentric with the clamping neck 9.

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  • 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)

Description

Die Erfindung betrifft eine Winkelhandschleifmaschine mit einem ein Motorgehäuse und ein Getriebegehäuse umfassenden Schleifmaschinengehäuse, in dem eine Schleifspindel drehbar gelagert ist, mit einer Schutzhaube für ein Werkzeug, die an einem Spannhals mittels eines Halteteils drehbar gelagert ist und auf diesem feststellbar ist, wobei ein Feststellteil im Bereich des Spannhalses drehfest gehalten ist, wobei das Feststellteil oder das Halteteil mindestens ein und das jeweils andere Teil mehrere miteinander verrastbare, durch ein Federglied belastete Feststellelemente aufweisen, welche gegen die Federkraft voneinander lösbar sind, und wobei ein Hebel zur Betätigung vorgesehen ist.The invention relates to an angle grinder with a grinder housing comprising a motor housing and a gear housing, in which a grinding spindle is rotatably mounted, with a protective hood for a tool, which is rotatably mounted on a clamping neck by means of a holding part and can be fixed thereon, a locking part in the Area of the clamping neck is held in a rotationally fixed manner, the fixing part or the holding part having at least one and the other part in each case a plurality of locking elements which can be locked together and are loaded by a spring member and which can be released from one another against the spring force, and wherein a lever is provided for actuation.

Eine derartige Schleifmaschine ist aus der EP-A-0 126 641 bekannt.Such a grinding machine is known from EP-A-0 126 641.

Aus der DE-B-3 135 820 ist eine weitere Handschleifmaschine bekannt, bei welcher die Schutzhaube an dem Spannhals drehbar gelagert und mit axialem Spiel gehalten ist, wobei zum Ausgleich dieses Spiels ein in axialer Richtung vorgespanntes federndes Element dient, welches einen Befestigungsring der Schutzhaube gegen eine Schulterfläche am Spannhals drückt. Dadurch ist die Schutzhaube durch Reibschluß gegen Verdrehungen gesichert.From DE-B-3 135 820 a further hand grinder is known, in which the protective hood is rotatably mounted on the clamping neck and is held with axial play, whereby to compensate for this play, a resilient element biased in the axial direction is used, which has a fastening ring of the protective cover presses against a shoulder surface on the clamping neck. As a result, the protective hood is secured against twisting by friction locking.

Der Nachteil dieser Vorrichtung ist darin zu sehen, daß die Schutzhaube unbeabsichtigt verstellt werden kann, insbesondere wenn man daran denkt, daß derartige Schleifmaschinen häufig an unübersichtlichen Stellungen im Einsatz sind, wobei der Benutzer sicher sein muß, daß die Schutzhaube in der richtigen Stellung steht und auch in dieser verbleibt.The disadvantage of this device can be seen in the fact that the protective hood can be adjusted unintentionally, especially when you think that such grinding machines are common are used in confusing positions, whereby the user must be sure that the protective hood is in the correct position and remains in this position.

Aus der EP-A-0 143 251 ist eine weitere Handschleifmaschine bekannt, bei der die Schutzhaube mittels einer Spannschelle und einer Befestigungsschraube auf dem Spindelhals des Getriebegehäuses lösbar befestigt ist. Um zu vermeiden, daß sich die Schutzhaube unbeabsichtigt vom Getriebegehäuse in Axialrichtung zur Schleifscheibe hin bewegt, ist im Bereich der Stirnseite des Spindelhalses ein Sicherungselement vorgesehen, das über den Außendurchmesser des Spindelhalses und den Innendurchmesser der Spannschelle hinausragt. Dieses Sicherungselement kann als flache Scheibe ausgebildet sein und mit einer Schraube auf der Stirnseite des Spannhalses befestigt sein. Des weiteren kann das Sicherungselement als federbelasteter Hebel ausgebildet sein und am Spindelhals schwenkbar gelagert sein.Another hand grinder is known from EP-A-0 143 251, in which the protective hood is detachably fastened on the spindle neck of the gear housing by means of a clamp and a fastening screw. In order to prevent the protective hood from inadvertently moving from the gear housing in the axial direction to the grinding wheel, a securing element is provided in the region of the end face of the spindle neck, which protrudes beyond the outside diameter of the spindle neck and the inside diameter of the clamping clamp. This securing element can be designed as a flat disc and fastened with a screw on the end face of the clamping neck. Furthermore, the securing element can be designed as a spring-loaded lever and can be pivotably mounted on the spindle neck.

Aus der US-A-3 811 233 ist ferner eine stationäre Werkzeugmaschine bekannt, bei welcher eine Schutzhaube für ein rotierendes Werkzeug vorgesehen ist, die über einen starr damit verbundenen Ring an einer Rückplatte des Maschinengehäuses festlegbar ist. Zur Verbindung dienen verschiedene umfangsseitige Ausnehmungen des Ringes, durch die hindurch Bolzen in die Rückplatte einsteckbar sind. Um den Ring gegen Verdrehen zu sichern, ist ein federbelasteter Stift vorgesehen, welcher in eine der Ausnehmungen am Umfang des Ringes eingerastet werden kann.From US-A-3 811 233 a stationary machine tool is also known, in which a protective hood for a rotating tool is provided, which can be fixed to a rear plate of the machine housing via a ring rigidly connected thereto. Various circumferential recesses in the ring are used for the connection, through which bolts can be inserted into the rear plate. In order to secure the ring against rotation, a spring-loaded pin is provided, which can be snapped into one of the recesses on the circumference of the ring.

Der Erfindung liegt die Aufgabe zugrunde, eine Schleifmaschine der eingangs genannten Art derart zu verbessern, daß eine einfache und ergonomisch günstige Verstellung der Schutzhaube ermöglicht ist.The invention has for its object to improve a grinding machine of the type mentioned in such a way that a simple and ergonomically favorable adjustment of the protective hood is made possible.

Diese Aufgabe wird durch eine Schleifmaschine mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a grinding machine with the features of patent claim 1.

Dadurch, daß der Hebel am Feststellteil vorgesehen ist, ergibt sich zusammen mit der besonderen Anordnung und Ausgestaltung des Hebels, der einen seitlich über den Umfang der Schutzhaube hervorstehenden Bereich aufweist, der sich zwischen der Schutzhaube und dem Motorgehäuse erstreckt, eine konstruktiv besonders einfache Lösung zusammen mit einer einfachen und ergonomisch günstigen Betätigung.The fact that the lever is provided on the locking part, together with the special arrangement and design of the lever, which has a protruding region laterally over the circumference of the protective hood and which extends between the protective hood and the motor housing, results in a structurally particularly simple solution with a simple and ergonomically favorable operation.

Eine besonders vorteilhafte Ausführungsform sieht vor, daß die Feststellelemente an einem Teil vorgesehene Rastvertiefungen und am anderen Teil vorgesehene Rastkörper sind, wobei dann die Rastkörper in die Rastvertiefungen eingreifen können. Im einfachsten Fall handelt es sich bei den Rastvertiefungen um Bohrungen, während der Rastkörper im einfachsten Fall ein in diese Bohrungen greifender Stift ist. Ein sehr einfach herstellbare Realisierungsmöglichkeit der Erfindung sieht vor, daß ein Rastkörper und mehrere Rastvertiefungen vorgesehen sind, wobei der einzige Rastkörper dann an dem Halte- oder Feststellteil angeordnet ist und die Rastvertiefungen an dem jeweils anderen Teil.A particularly advantageous embodiment provides that the locking elements are locking recesses provided on one part and locking bodies provided on the other part, in which case the locking bodies can engage in the locking recesses. In the simplest case, the locking recesses are bores, while in the simplest case the locking body is a pin that engages in these bores. A very easy to implement implementation of the invention provides that a locking body and several locking recesses are provided, the single locking body is then arranged on the holding or locking part and the locking recesses on the other part.

Als besonders zweckmäßig hat es sich erwiesen, wenn das Halteteil als ein den Spannhals umgebender Ring ausgebildet ist, welcher vorzugsweise einstückig an die Schutzhaube angeformt ist.It has proven to be particularly expedient if the holding part is designed as a ring surrounding the clamping neck, which is preferably integrally formed on the protective hood.

Desgleichen kann das Feststellteil ein den Spannhals umschließender Ring sein.Likewise, the locking part can be a ring enclosing the clamping neck.

Bei einer vorteilhaften Weiterbildung ist vorgesehen, daß das Federglied ein den Spannhals umschließendes ringförmiges Element ist, mit welchem das jeweils verkippbare Teil gegen eine Schulter angelegt ist.In an advantageous further development it is provided that the spring member is an annular element enclosing the clamping neck, with which the respective tiltable part is placed against a shoulder.

Weitere Merkmale und Vorteile sind Gegenstand der nachfolgenden Beschreibung sowie der zeichnerischen Darstellung eines Ausführungsbeispieles. Es zeigt:

Fig. 1
eine Seitenansicht eines Vorderteils eines Ausführungsbeispiels einer erfindungsgemäßen Handschleifmaschine mit geschnitten dargestellter Schutzhaube.
Further features and advantages are the subject of the following description and the drawing of an exemplary embodiment. It shows:
Fig. 1
a side view of a front part of an embodiment of a hand grinder according to the invention with a protective hood shown in section.

Eine in Fig. 1 dargestellte, als Ganzes mit 1 bezeichnete Winkelschleifmaschine zeigt ein Motorgehäuse 2 und ein Getriebegehäuse 3. Aus dem Getriebegehäuse 3 ragt eine Schleifspindel 4 heraus, welche an ihrem Ende einen Spannflansch 5 trägt. Auf diesem Spannflansch 5 ist eine Schleifscheibe 6 aufgelegt und durch einen Gegenflansch 7 einer in die Schleifspindel 4 einschraubbaren Schraube gegen den Spannflansch 5 gespannt.An angle grinder shown in FIG. 1, designated as a whole by 1, shows a motor housing 2 and a gear housing 3. A grinding spindle 4 protrudes from the gear housing 3 and carries a clamping flange 5 at its end. A grinding wheel 6 is placed on this clamping flange 5 and clamped against the clamping flange 5 by a counter flange 7 of a screw that can be screwed into the grinding spindle 4.

Die Schleifscheibe 6 wird bereichsweise durch eine als Ganzes mit 8 bezeichnete Schutzhaube überdeckt, welche an einem die Schleifspindel 4 zwischen dem Gegenflansch 5 und dem Getriebegehäuse 3 umgebenden und am Getriebegehäuse 3 montierten Spannhals 9 drehbar gelagert ist.The grinding wheel 6 is partially covered by a protective hood designated as a whole, which is rotatably mounted on a clamping neck 9 which surrounds the grinding spindle 4 between the counter flange 5 and the gear housing 3 and is mounted on the gear housing 3.

Der Spannhals 9 ist ausgehend vom Getriebegehäuse 3 in insgesamt drei zur Schleifspindel 4 koaxiale Abschnitte 10 bis 12 mit ausgehend vom Getriebegehäuse aufeinanderfolgend geringerem Außendurchmesser unterteilt. Zwischen diesen kreiszylindrischen Abschnitten 10 bis 12 werden dadurch in senkrecht zur Drehachse der Schleifspindel 4 stehenden Ebenen liegende kreisringförmige Anlageflächen 13 und 14 gebildet.Starting from the gear housing 3, the clamping neck 9 is successive in a total of three sections 10 to 12 coaxial to the grinding spindle 4, starting from the gear housing divided smaller outer diameter. Between these circular cylindrical sections 10 to 12, annular contact surfaces 13 and 14 are thereby formed in planes perpendicular to the axis of rotation of the grinding spindle 4.

Der erste, dem Getriebegehäuse 3 benachbart liegende kreiszylindrische Abschnitt ist von einem Federelement 15 umgeben, welches sich einerseits an einer durch das Getriegehäuse 3 gebildeten und zur Drehachse der Schleifspindel 4 senkrecht stehenden Fläche 16 abstützt und andererseits an einem ebenfalls den ersten kreiszylindrischen Abschnitt 10 umgebenden Ring 17 eines als Ganzes mit 18 bezeichneten Feststellelements anliegt. welches außerdem einen an den Ring 17 angeformten Hebelarm 19 aufweist, welcher sich in einem Zwischenraum zwischen der Schutzhaube 8 und dem Motorgehäuse 2 erstreckt. Der Ring 17 ist durch das Federelement 15 gegen einen auf dem zweiten kreiszylindrischen Abschnitt 11 sitzenden Zwischenring 20 gedrückt, welcher seinerseits an der Anlagefläche 13 zwischen dem kreiszylindrischen Abschnitt 10 und dem einen geringeren Durchmesser aufweisenden kreiszylindrischen Abschnitt 11 anliegt. Der Zwischenring 20 ist seinerseits durch einen Fixierring 21 gehalten, welcher auf dem dritten kreiszylindrischen Abschnitt 12 sitzt und an der Anlagefläche 14 anliegt. Dieser Fixierring 21 ist durch einen Sprengring 22 gehalten, welcher in eine umlaufende Nut 23, eingearbeitet in den dritten kreiszylindrischen Abschnitt 12, greift.The first circular-cylindrical section lying adjacent to the gear housing 3 is surrounded by a spring element 15 which, on the one hand, is located on a gear housing 3 which is formed and is perpendicular to the axis of rotation of the grinding spindle 4 Surface 16 is supported and, on the other hand, bears against a ring 17, likewise surrounding the first circular cylindrical section 10, of a locking element designated as a whole as 18. which also has a lever arm 19 molded onto the ring 17, which extends in an intermediate space between the protective hood 8 and the motor housing 2. The ring 17 is pressed by the spring element 15 against an intermediate ring 20 seated on the second circular-cylindrical section 11, which in turn bears against the contact surface 13 between the circular-cylindrical section 10 and the smaller-diameter circular-cylindrical section 11. The intermediate ring 20 is in turn held by a fixing ring 21 which sits on the third circular cylindrical section 12 and bears against the contact surface 14. This fixing ring 21 is held by a snap ring 22 which engages in a circumferential groove 23, machined into the third circular-cylindrical section 12.

Zur Lagerung der Schutzhaube 8 ist der Zwischenring 20 auf seiner dem Fixierring 21 zugewandten Seite mit einer radial nach außen sowie zum Fixierring 21 offenen, kreisringförmigen Ausnehmung 24 versehen, in welcher ein ringförmig ausgebildetes Halteteil 25 der Schutzhaube 8 koaxial zur Schleifspindel 4 drehbar, jedoch in axialer Richtung unverschieblich gelagert ist. Dieses Halteteil 25 weist auf einem Kreisbogensegment im gleichen Winkelabstand angeordnete Bohrungen 26 auf. In eine dieser Bohrungen 26 greift ein am Feststellteil 18 im Bereich des Übergangs zwischen dem Ring 17 und dem Hebelarm 19 angeordneter Stift 27 ein, welcher sich von dem Feststellteil 18 ausgehend durch eine Aussparung 28 im Zwischenring 20 zu dem Halteteil 25 erstreckt.To support the protective hood 8, the intermediate ring 20 is provided on its side facing the fixing ring 21 with a radially outward opening and an annular recess 24 open to the fixing ring 21, in which an annular holding part 25 of the protective hood 8 can be rotated coaxially to the grinding spindle 4, but in is axially fixed. This holding part 25 has holes 26 arranged at the same angular distance on a circular arc segment. One of these bores 26 engages with a pin 27 arranged on the fixing part 18 in the region of the transition between the ring 17 and the lever arm 19, which extends from the fixing part 18 through a recess 28 in the intermediate ring 20 to the holding part 25.

Der Ring 17 ist auf dem ersten kreiszylindrischen Abschnitt 10 mit Spiel gehalten, so daß dieser in axialer Richtung zur Schleifspindel 4 gegen die Wirkung des Federelements 15, bei welchem es sich beispielsweise um eine Wellenfeder oder einen Gummiring handelt, in Richtung des Getriebegehäuses 3 verschiebbar ist. Durch Betätigen des Feststellteils 18 im Bereich des Hebelarms 19 wird der Ring 17 als Ganzes gegenüber dem Spannhals 9 so weit verkippt, daß der Übergang zwischen dem Ring 17 und dem Hebel 19 des Feststellteils 18 sich der Fläche 16 des Getriebegehäuses 3 nähert und damit der in diesem Bereich angeordnete Stift 27 aus der Bohrung 26 im Halteteil 15, in welche er eingegriffen hat, herausbewegt wird. In diesem Fall kann die mit dem Halteteil 25 in dem Zwischenring 20 drehbar gelagerte Schutzhaube 8 frei um den Spannhals 9 gedreht werden. Nach Loslassen des Hebelarms 19 wird der Stift 27 durch das Federelement 15 wieder in Richtung des Halteteils 25 bewegt, so daß er nunmehr mit der dieser gegenüberliegenden Bohrung 26 in Eingriff komm und das Halteteil 25 mit der Schutzhaube 8 drehfest am Spannhals 9 festlegt. Dies erfolgt dadurch, daß der Stift 27 durch die Aussparung 28 unverdrehbar am Spannhals 9 festgelegt ist.The ring 17 is held on the first circular cylindrical section 10 with play so that it can be displaced in the direction of the gear housing 3 in the axial direction of the grinding spindle 4 against the action of the spring element 15, which is, for example, a wave spring or a rubber ring . By actuating the locking part 18 in the region of the lever arm 19, the ring 17 as a whole is tilted so far relative to the clamping neck 9 that the transition between the ring 17 and the lever 19 of the locking part 18 approaches the surface 16 of the gear housing 3 and thus that in this area arranged pin 27 is moved out of the bore 26 in the holding part 15, in which he has engaged. In this case, the protective hood 8, which is rotatably mounted with the holding part 25 in the intermediate ring 20, can be freely rotated around the clamping neck 9. After releasing the lever arm 19, the pin 27 is moved again in the direction of the holding part 25 by the spring element 15, so that he now comes into engagement with the opposite bore 26 and fixes the holding part 25 with the protective hood 8 in a rotationally fixed manner on the clamping neck 9. This is done in that the pin 27 is fixed non-rotatably on the clamping neck 9 through the recess 28.

Vorteilhafterweise sind die Wandungen der Bohrungen 26 so geformt, daß auch bei starkem seitlichem Druck auf die Schutzhaube 8 der Stift 27 nicht aus den Bohrungen 26 herausspringen kann. Des weiteren ist zweckmäßigerweise, um die Schutzhaube 8 in allen denkbaren Drehstellungen arretieren zu können, vorgesehen, daß an dem Halteteil 25 in einem großen Umfangsbereich die Bohrungen 26 vorgesehen sind, die alle mit ihrem Zentrum auf einem zum Spannhals 9 konzentrischen Kreisbahnsegment liegen.Advantageously, the walls of the bores 26 are shaped such that the pin 27 cannot jump out of the bores 26 even when there is strong lateral pressure on the protective hood 8. Furthermore, in order to be able to lock the protective hood 8 in all conceivable rotational positions, it is provided that the bores 26 are provided on the holding part 25 in a large circumferential area, all of which lie with their center on a circular path segment concentric with the clamping neck 9.

Claims (7)

  1. Hand grinder with a grinder housing (2, 3), in which a grinding spindle (4) is mounted rotatably, and which comprises a motor housing (2) and a gearing housing (3), further comprising a protective hood (8) for a tool (6), said protective hood being mounted rotatably on a clamping collar (9) by means of a holding part (25) and being lockable on the latter, wherein a locking part (18) is held fixedly in terms of rotation in the region of the clamping collar (9), wherein the locking part (18) or the holding part (25), at least one and the other respective part, have a plurality of locking elements (26, 27) which are engageable with one another and are loaded by a spring member (15) and which are releasable from one another counter to the spring force, and wherein a lever is provided for actuating, characterized in that said lever (19) is provided on said locking part (18) for the tilting, and in that the lever (19) comprises a region which protrudes laterally beyond the perimeter of the protective hood (8), said region extending between said protective hood (8) and said motor housing (2).
  2. Hand grinder according to claim 1, characterized in that the locking elements are catch depressions (26) provided on one part and catch bodies (27) provided on the other part.
  3. Hand grinder according to claim 2, characterized in that one catch body (27) and a plurality of catch depressions (26) are provided.
  4. Hand grinder according to one of the preceding claims, characterized in that the holding part (25) is designed as a ring surrounding the clamping collar (9).
  5. Hand grinder according to claim 4, characterized in that the holding part (25) is formed in one piece onto the protective hood (8).
  6. Hand grinder according to one of the preceding claims, characterized in that the locking part (18) has a ring surrounding the clamping collar (9).
  7. Hand grinder according to one of the preceding claims, characterized in that the spring member is an annular element (15) surrounding the clamping collar (9).
EP88120765A 1987-12-24 1988-12-13 Power grinder with an adjustable protecting hood Expired - Lifetime EP0322626B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3744219 1987-12-24
DE19873744219 DE3744219A1 (en) 1987-12-24 1987-12-24 HAND GRINDING MACHINE WITH ADJUSTABLE PROTECTIVE COVER

Publications (4)

Publication Number Publication Date
EP0322626A2 EP0322626A2 (en) 1989-07-05
EP0322626A3 EP0322626A3 (en) 1990-10-10
EP0322626B1 EP0322626B1 (en) 1993-03-31
EP0322626B2 true EP0322626B2 (en) 1996-10-30

Family

ID=6343692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88120765A Expired - Lifetime EP0322626B2 (en) 1987-12-24 1988-12-13 Power grinder with an adjustable protecting hood

Country Status (5)

Country Link
US (1) US4924635A (en)
EP (1) EP0322626B2 (en)
JP (1) JPH01281874A (en)
DE (1) DE3744219A1 (en)
ES (1) ES2040316T5 (en)

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US6464573B1 (en) 2000-06-30 2002-10-15 Porter-Cable Corporation Guard attachment system with knurled clamp ring
DE20304448U1 (en) * 2003-03-19 2003-06-12 Berhalter Eberhard Hand tool
SE525836C2 (en) * 2003-03-31 2005-05-10 Atlas Copco Tools Ab Grinding machine with explosion protection and spindle lock
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DE10348395A1 (en) * 2003-10-17 2005-05-19 Robert Bosch Gmbh Protective cover for a power tool, power tool and system with protective hood and power tool
US7059947B2 (en) * 2004-05-12 2006-06-13 The Stanley Works Portable rail cutting apparatus
US20070117499A1 (en) * 2005-11-23 2007-05-24 Sunmatch Industrial Co., Ltd. Rotary protecting hood of a pneumatic grinder
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US8939816B2 (en) 2012-07-02 2015-01-27 Sunmatch Industrial Co., Ltd. Handheld pneumatic grinder with adjustable wheel guard structure
DE102012112621A1 (en) 2012-12-19 2014-06-26 C. & E. Fein Gmbh Hand tool e.g. angle grinder, has fuse elements cooperated together at actuator and clamping portion in each working position by positively locking protective cover at spindle neck movable in axial retaining element on spindle neck
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USD744800S1 (en) 2014-07-16 2015-12-08 Milwaukee Electric Tool Corporation Power tool blade guard
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Also Published As

Publication number Publication date
JPH0579466B2 (en) 1993-11-02
EP0322626A2 (en) 1989-07-05
EP0322626A3 (en) 1990-10-10
EP0322626B1 (en) 1993-03-31
DE3744219A1 (en) 1989-07-06
JPH01281874A (en) 1989-11-13
ES2040316T5 (en) 1997-02-16
US4924635A (en) 1990-05-15
DE3744219C2 (en) 1990-01-04
ES2040316T3 (en) 1993-10-16

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