EP3849743B1 - Hand-held abrasive cut-off machine - Google Patents

Hand-held abrasive cut-off machine Download PDF

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Publication number
EP3849743B1
EP3849743B1 EP19756416.4A EP19756416A EP3849743B1 EP 3849743 B1 EP3849743 B1 EP 3849743B1 EP 19756416 A EP19756416 A EP 19756416A EP 3849743 B1 EP3849743 B1 EP 3849743B1
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EP
European Patent Office
Prior art keywords
spindle
bearing
arm cover
arm
hand
Prior art date
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Active
Application number
EP19756416.4A
Other languages
German (de)
French (fr)
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EP3849743A1 (en
Inventor
Helmut Specht
Stefan Teufelhart
Guenther Veik
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.)
Hilti AG
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Hilti AG
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Publication of EP3849743A1 publication Critical patent/EP3849743A1/en
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Publication of EP3849743B1 publication Critical patent/EP3849743B1/en
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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
    • B24B27/00—Other grinding machines or devices
    • B24B27/06—Grinders for cutting-off
    • B24B27/08—Grinders for cutting-off being portable
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B25F5/021—Construction of casings, bodies or handles with guiding devices

Definitions

  • the present invention relates to a hand-held cut-off machine according to the preamble of claim 1.
  • Cut-off machines are hand-held tools with a processing tool that is designed in the form of a rotating cutting disc.
  • the main components of a cut-off machine include a motor housing with a drive unit and a boom with a support arm and an arm cover that is attached to the support arm using fastening elements.
  • a first end of the support arm is fixed to the motor housing and the spindle is fixed to a second end of the support arm by means of a bearing element.
  • the spindle is connected to the drive unit via a transmission device designed as a belt drive.
  • DE 103 25 663 A1 discloses such a hand-held power cutter.
  • EP 3 173 188 A1 describes a hand-held cut-off machine according to the preamble of claim 1, which can achieve an increased cutting depth.
  • the support arm must be as compact and compact in the area of its second end be as filigree as possible.
  • a compact and filigree support arm has the disadvantage that the stability and rigidity of the support arm is reduced. Forces that occur when working with the hand-held cut-off grinder on the cut-off wheel are transferred to the support arm via the spindle and its bearing elements. The greater the forces that occur on the cutting disc during machining, the greater the load on the support arm.
  • the object of the present invention is to further develop a hand-held cut-off machine such that a compact and filigree support arm can withstand high forces. Damage to the support arm should not occur even with high forces.
  • the hand-held cut-off machine is characterized in that a stop element is provided in the arm cover for the spindle, the stop element limiting the movement of the spindle in a plane perpendicular to the axis of rotation during operation.
  • the stop element makes it possible to redirect at least part of the forces that occur into the arm cover and to reduce the load on the support arm in the area of its second end.
  • the spindle moves, which is guided by one or more bearing elements in the support arm.
  • the higher the forces that occur the greater the movement of the spindle in a plane perpendicular to the axis of rotation of the cutting disc, which coincides with the axis of rotation of the spindle.
  • the spindle hits the stop element, at least a part of the occurring forces is transmitted from the spindle to the stop element and forwarded from the stop element into the arm cover. Since the arm cover is fastened to the support arm via the fastening elements, the forces are again transmitted from the arm cover to the support arm via the fastening elements.
  • the fastening elements are preferably arranged in robustly designed areas of the arm cover and the support arm.
  • the spindle stop member may be integral with the arm cover, or formed as a separate insert member fitted into a bearing seat in the arm cover, or as a bearing member fitted into a bearing seat in the arm cover.
  • the bearing seat for the separate insert element and the bearing seat for the bearing element are preferably integrated into the arm cover.
  • the arm cover is preferably made as a cast part from a metal material. Bearing seats, reinforcement struts and other functional elements can be easily integrated into cast parts.
  • the support arm has a first bearing seat and a second bearing seat in the region of the second end, with a first bearing element being arranged in the first bearing seat and a second bearing element being arranged in the second bearing seat.
  • the spindle is mounted on the support arm via the first bearing element and the second bearing element, which are arranged at a distance from one another on the support arm.
  • the bearing of the spindle via two spaced-apart bearing elements has the advantage over a single bearing element that the tilting moment of the spindle is lower. The greater the distance between the first and second bearing element, the lower the tilting moment of the spindle.
  • the arm cover is preferably made of a metal material.
  • An arm cover made of a metal material has the advantage over conventional arm covers made of plastics that, due to the higher modulus of elasticity, forces that occur can be passed on by the arm cover without the arm cover being damaged.
  • the arm cover is particularly preferably made of a light metal material.
  • Aluminum and magnesium, for example, are suitable as light metal materials.
  • Light metal materials reduce the weight of the arm cover compared to metal materials such as steel.
  • the stop member is in the form of an insert member, the insert member being located in a bearing seat formed in the arm cover.
  • the bearing seat in the arm cover is preferably integrated into the arm cover. Wear can be reduced by designing the stop element as an insert element which is fitted into a bearing seat in the arm cover.
  • the selection of the materials for the spindle and the insert element can be adapted to one another. The matching of the materials is particularly important since the spindle is moved about an axis of rotation relative to the insert element.
  • the stop element is designed in the form of a further bearing element, the further bearing element being arranged in a bearing seat which is formed in the arm cover.
  • the bearing seat in the arm cover is preferably integrated into the arm cover. Wear can be reduced by designing the stop element as a further bearing element.
  • the choice of materials for the spindle and the additional bearing element can be matched to one another.
  • a stop element in the form of a further bearing element, for example a ball bearing has the additional advantage that only small relative movements occur between the spindle and the inside of the ball bearing and wear is further reduced.
  • the spindle is mounted in the support arm via the first and second bearing element and in the arm cover via a further bearing element.
  • the additional bearing element in the arm cover can derive forces from the support arm via the spindle when the hand-held cut-off machine is in operation as a stop element.
  • the first bearing element is particularly preferably designed as a fixed bearing and the further bearing element is designed as a floating bearing for the spindle.
  • the design of the additional bearing element in the arm cover as a floating bearing prevents geometric overdetermination for the spindle when it is at rest.
  • the further bearing element is fitted into the bearing seat in the arm cover (press fit) and the arm cover can be pushed onto the spindle with the further bearing element.
  • the arm cover is then attached to the support arm using the fasteners.
  • FIGN. 1A , B show a hand-held power tool 10 according to the invention, which is designed in the form of a hand-held cut-off grinder.
  • the hand-held cut-off machine 10 has a processing tool designed as a cutting disc 11 which is arranged on a spindle 12 and can be rotated about an axis of rotation 13 .
  • the hand-held cut-off machine 10 includes a motor housing 14 with a drive unit 15 and a boom 16 with a support arm 17 and an arm cover 18.
  • the arm cover 18 is attached to the support arm 17 via fastening elements 19, which can be designed as screws.
  • FIG. 1A 12 shows the hand-held power cutter 10 with the arm cover 18 and attached
  • FIG. 1B shows the hand-held power cutter 10 without the arm cover 18.
  • the cutting wheel 11 is driven via the drive unit 15, a transmission device 21 arranged in the boom 16, which is designed as a belt drive in the exemplary embodiment shown, and the spindle 12.
  • the term "drive unit” summarizes all drive components that are arranged in the motor housing 14 .
  • a drive motor not shown, is arranged in the motor housing 14 and is an internal combustion engine in the exemplary embodiment shown, but can also be an electric motor.
  • a centrifugal clutch can be arranged between the drive motor and the belt drive 21, which ensures that the cutting disc 11 does not rotate at low speeds, such as when idling or when starting the hand-held cut-off machine 10; in addition, further transmission components can be arranged between the drive motor and the transmission device 21 .
  • the drive motor drives a drive shaft and drive pulley 22 .
  • a transmission element 23 designed as a drive belt is guided over the drive pulley 22 and a driven pulley 24 mounted on the spindle 12 .
  • the drive pulley 22, the drive belt 23 and the driven pulley 24 form the belt drive 21.
  • the transmission device 21 can be designed, for example, in the form of a chain drive in which the transmission element between the drive pulley 22 and the driven pulley 24 is not a drive belt but a chain is trained.
  • the transmission device 21, which connects the spindle 12 to the drive unit 15, is arranged in the boom 16.
  • the arm cover 18 is used, among other things, to cover the rotating components of the transmission device 21 and to reduce the risk of injury from the operator reaching into the rotating components of the transmission device 21 when the hand-held cut-off machine 10 is in operation.
  • the support arm 17 of the boom 16 is fixed at a first end 25 to the motor housing 14 and at a second end 26 of the support arm 17, the spindle 12 is fixed by means of a bearing element, not shown.
  • the cutting disk 11 is surrounded by a protective hood 27 which serves to protect the operator from dust particles flying around and also reduces the risk of injury from the operator reaching into the rotating cutting disk 11 when the hand-held cut-off grinder 10 is in operation.
  • a first handle 28 which is designed as a top handle and is arranged above the motor housing 14 , is provided for operating the hand-held cut-off machine 10 .
  • the first handle can be designed as a rear handle, which is arranged on the side of the motor housing 14 facing away from the cutting disk 11 .
  • a second handle 29 which is arranged between the cutting disk 11 and the first handle 28 , is provided for guiding the hand-held cut-off machine 10 .
  • the second handle 29 is in the embodiment shown FIGN. 1A , B designed as a separate grip tube or alternatively can be designed in one piece with the motor housing 14 .
  • FIGN. 2A , B show the arm cover 18 of the boom 16 of FIG. 1A in a view of the inside with a stop element, which as an insert element 31 ( FIG. 2A ) or as a bearing element 32 ( FIG. 2 B ) is trained.
  • a stop element which as an insert element 31 ( FIG. 2A ) or as a bearing element 32 ( FIG. 2 B ) is trained.
  • the arm cover 18 is part of the cantilever 16 and is fastened to the support arm 17 by means of the fastening elements 19 which are in the form of screws, for example.
  • the arm cover 18 and the support arm 17 can be manufactured as cast parts from a metal material, for reasons of weight in particular as cast parts from a light metal material.
  • the arm cover 18 has a plurality of reinforcement struts 33.
  • arm cover 18 enables forces to be introduced into the arm cover 18 without the arm cover 18 being damaged.
  • Ordinary arm covers for hand-held cut-off machines made of plastic are unsuitable for the introduction of forces because of their lower modulus of elasticity; they serve exclusively to cover the rotating components of the transmission device 21.
  • the spindle 12 moves, which is guided via bearing elements in the support arm 17.
  • the arm cover is in the area of the second end 26 18 a stop element is provided. The stop element makes it possible during operation of the hand-held cut-off machine 10 to divert part of the forces that occur into the arm cover 18 and thereby to reduce the load on the support arm 17 in the area of its second end 26 .
  • the arm cover 18 is fastened to the support arm 17 via the fastening elements 19.
  • the forces are also transferred from the arm cover 18 to the support arm 17 via the fastening elements 19.
  • screw bosses 34 are provided on the arm cover 18, into which the screws 19 are screwed .
  • the screw domes 34 are in particular arranged in such a way that the forces are transferred from the arm cover 18 to robust and stable areas of the support arm 17 .
  • FIG. 2A shows the arm cover 18 with a stop element, which is designed as an insert element 31.
  • the insert element 31 has an inner contour 36 which serves as a stop surface for the spindle 12 during operation of the hand-held cut-off machine 10 and limits the movement of the spindle 12 in a plane perpendicular to the axis of rotation 13 .
  • the materials of the spindle 12 and the insert element 31 can be matched. The matching of the materials is particularly important since the spindle 12 is moved relative to the insert element 31 about an axis of rotation.
  • FIG. 2 B shows the arm cover 18 with a stop element, which is designed as a bearing element 32.
  • the materials of the spindle 12 and the bearing element 32 can be matched.
  • the bearing element 32 for example in the form of a ball bearing, has the additional advantage that only small relative movements occur between the spindle 12 and the inside of the ball bearing and wear on the insert element 31 is further reduced.
  • FIG. 3 shows the arm 16 of the hand-held cut-off machine 10 of FIG. 1A in a section through the spindle 12, a stop element 41 for the spindle 12 being provided in the arm cover 18.
  • the stop element 41 is designed as a bearing element for the spindle 12 and can, for example, by the bearing element 32 of FIG. 2 B be replaced.
  • the hand-held cut-off machine 10 comprises the cut-off wheel 11, the motor housing 14 with the drive unit 15 and the boom 16 with the support arm 17 and the arm cover 18.
  • the cut-off wheel 11 is fastened to the spindle 12 by means of a flange 42 and is designed to be rotatable about the axis of rotation 13.
  • the movement of the drive unit 15 is transmitted to the spindle 12 via the drive pulley 22, the drive belt 23 and the driven pulley 24; the output disk 24 is arranged on the spindle 12 in a rotationally fixed manner.
  • the spindle 12 is mounted on the support arm 17 via a first bearing element 43 and a second bearing element 44 .
  • the support arm 17 has a first bearing seat 45 and a second bearing seat 46 in the region of its second end 26 .
  • the first bearing member 43 is fitted in the first bearing seat 45 and the second bearing member 44 is fitted in the second bearing seat 46 .
  • the bearing of the spindle 12 via the spaced-apart first and second bearing elements 43, 44 has the advantage over a single bearing element that the tilting moment of the spindle 12 is lower. The greater the distance between the first and second bearing elements 43, 44, the lower the tilting moment of the spindle 12.
  • the stop element 41 is designed as a further bearing element for the spindle 12 and is also referred to as the third bearing element.
  • the first bearing element 43 is designed as a fixed bearing for the spindle 12 and the third bearing element 41 is designed as a floating bearing for the spindle 12 .
  • the design of the third bearing element 41 in the arm cover 18 as a floating bearing prevents a geometric overdetermination for the spindle 12 when the cut-off machine 10 is at rest.
  • the third bearing element 41 is fitted into the bearing seat 47 in the arm cover 18 (press fit) and the arm cover 18 can be connected to the third bearing element 41 are pushed onto the spindle 12.
  • the arm cover 18 is fastened to the support arm 17 by means of the fastening elements 19 .
  • the stop element 41 limits the movement of the spindle 12 in a plane 48 perpendicular to the axis of rotation 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Description

Technisches Gebiettechnical field

Die vorliegende Erfindung betrifft einen handgeführten Trennschleifer gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a hand-held cut-off machine according to the preamble of claim 1.

Stand der TechnikState of the art

Trennschleifer sind handgeführte Werkzeuggeräte mit einem Bearbeitungswerkzeug, das in Form einer rotierenden Trennscheibe ausgebildet ist. Die wesentlichen Komponenten eines Trennschleifers umfassen neben der Trennscheibe, die auf einer Spindel angeordnet ist und um eine Drehachse drehbar ist, ein Motorgehäuse mit einer Antriebseinheit und einen Ausleger mit einem Tragarm und einer Armabdeckung, die über Befestigungselemente am Tragarm befestigt wird. Der Tragarm ist mit einem ersten Ende am Motorgehäuse festgelegt und an einem zweiten Ende des Tragarms ist die Spindel mittels eines Lagerelementes festgelegt. Die Spindel ist über eine als Riemenantrieb ausgebildete Übertragungseinrichtung mit der Antriebseinheit verbunden. DE 103 25 663 A1 offenbart einen solchen handgeführten Trennschleifer.Cut-off machines are hand-held tools with a processing tool that is designed in the form of a rotating cutting disc. In addition to the cutting disc, which is arranged on a spindle and can be rotated about an axis of rotation, the main components of a cut-off machine include a motor housing with a drive unit and a boom with a support arm and an arm cover that is attached to the support arm using fastening elements. A first end of the support arm is fixed to the motor housing and the spindle is fixed to a second end of the support arm by means of a bearing element. The spindle is connected to the drive unit via a transmission device designed as a belt drive. DE 103 25 663 A1 discloses such a hand-held power cutter.

Die während der Bearbeitung mit einem handgeführten Trennschleifer auftretenden Reaktionskräfte werden bei bekannten handgeführten Trennschleifern vom Tragarm aufgenommen. Daher spielen die Stabilität und Steifigkeit des Tragarms eine wichtige Rolle bei der konstruktiven Auslegung von handgeführten Trennschleifern; außerdem ist bei handgeführten Werkzeuggeräten die Gewichtsoptimierung grundsätzlich von Bedeutung. DE 103 25 663 A1 beschreibt einen handgeführten Trennschleifer mit einer einteiligen Ausbildung des Tragarms, was zu einer höheren Stabilität und Steifigkeit gegenüber mehrteiligen Tragarmen führen soll. Um das Gewicht zu reduzieren, sind im Tragarm zahlreiche Öffnungen und Aussparungen vorgesehen, wobei der Tragarm in den Öffnungen und Aussparungen Verstärkungsstreben besitzt, die die Steifigkeit erhöhen.The reaction forces occurring during machining with a hand-held cut-off machine are absorbed by the support arm in known hand-held cut-off machines. Therefore, the stability and rigidity of the support arm play an important role in the design of hand-held cut-off machines; in addition, weight optimization is fundamentally important for hand-operated tools. DE 103 25 663 A1 describes a hand-held cut-off machine with a one-piece design of the support arm, which should lead to greater stability and rigidity compared to multi-part support arms. In order to reduce the weight, numerous openings and recesses are provided in the support arm, the support arm having reinforcing struts in the openings and recesses which increase rigidity.

Bei handgeführten Trennschleifern ist die Schnitttiefe ein wichtiges Kriterium. EP 3 173 188 A1 beschreibt einen handgeführten Trennschleifer nach dem Oberbegriff des Anspruchs 1, der eine erhöhte Schnitttiefe erzielen kann. Dazu muss der Tragarm allerdings im Bereich seines zweiten Endes so kompakt und filigran wie möglich ausgebildet sein. Ein kompakter und filigraner Tragarm hat gleichzeitig den Nachteil, dass die Stabilität und Steifigkeit des Tragarms reduziert ist. Kräfte, die durch die Bearbeitung mit dem handgeführten Trennschleifer an der Trennscheibe auftreten, werden über die Spindel und deren Lagerelemente auf den Tragarm übertragen. Je grösser die Kräfte sind, die während der Bearbeitung an der Trennscheibe auftreten, umso grösser ist die Belastung des Tragarms.The cutting depth is an important criterion for hand-held cut-off machines. EP 3 173 188 A1 describes a hand-held cut-off machine according to the preamble of claim 1, which can achieve an increased cutting depth. To do this, however, the support arm must be as compact and compact in the area of its second end be as filigree as possible. At the same time, a compact and filigree support arm has the disadvantage that the stability and rigidity of the support arm is reduced. Forces that occur when working with the hand-held cut-off grinder on the cut-off wheel are transferred to the support arm via the spindle and its bearing elements. The greater the forces that occur on the cutting disc during machining, the greater the load on the support arm.

Darstellung der ErfindungPresentation of the invention

Die Aufgabe der vorliegenden Erfindung besteht darin, einen handgeführten Trennschleifer dahingehend weiterzuentwickeln, dass ein kompakter und filigraner Tragarm hohen Kräften standhalten kann. Beschädigungen des Tragarms sollen auch bei hohen Kräften nicht auftreten.The object of the present invention is to further develop a hand-held cut-off machine such that a compact and filigree support arm can withstand high forces. Damage to the support arm should not occur even with high forces.

Diese Aufgabe wird bei dem eingangs genannten handgeführten Trennschleifer erfindungsgemäß durch die Merkmale des unabhängigen Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.This object is achieved according to the invention by the features of independent claim 1 in the case of the hand-held cut-off machine mentioned at the outset. Advantageous developments are specified in the dependent claims.

Erfindungsgemäß ist der handgeführte Trennschleifer dadurch gekennzeichnet, dass in der Armabdeckung für die Spindel ein Anschlagelement vorgesehen ist, wobei das Anschlagelement die Bewegung der Spindel in einer Ebene senkrecht zur Drehachse im Betrieb begrenzt. Das Anschlagelement ermöglicht es im Betrieb des handgeführten Trennschleifers zumindest einen Teil der auftretenden Kräfte in die Armabdeckung umzuleiten und die Belastung des Tragarms im Bereich seines zweiten Endes zu verringern.According to the invention, the hand-held cut-off machine is characterized in that a stop element is provided in the arm cover for the spindle, the stop element limiting the movement of the spindle in a plane perpendicular to the axis of rotation during operation. During operation of the hand-held cut-off machine, the stop element makes it possible to redirect at least part of the forces that occur into the arm cover and to reduce the load on the support arm in the area of its second end.

Während des Betriebs des handgeführten Trennschleifers kommt es einer Bewegung der Spindel, die über ein oder mehrere Lagerelemente im Tragarm geführt ist. Je höher die auftretenden Kräfte sind, umso grösser wird die Bewegung der Spindel in einer Ebene senkrecht zur Drehachse der Trennscheibe, die mit der Drehachse der Spindel zusammenfällt. Wenn die Spindel am Anschlagelement anschlägt, wird zumindest ein Teil der auftretenden Kräfte von der Spindel an das Anschlagelement übertragen und vom Anschlagelement in die Armabdeckung weitergeleitet. Da die Armabdeckung über die Befestigungselemente am Tragarm befestigt ist, werden die Kräfte über die Befestigungselemente wieder von der Armabdeckung an den Tragarm übertragen. Die Befestigungselemente werden bevorzugt in robust ausgebildeten Bereichen der Armabdeckung und des Tragarms angeordnet.During operation of the hand-held cut-off machine, the spindle moves, which is guided by one or more bearing elements in the support arm. The higher the forces that occur, the greater the movement of the spindle in a plane perpendicular to the axis of rotation of the cutting disc, which coincides with the axis of rotation of the spindle. When the spindle hits the stop element, at least a part of the occurring forces is transmitted from the spindle to the stop element and forwarded from the stop element into the arm cover. Since the arm cover is fastened to the support arm via the fastening elements, the forces are again transmitted from the arm cover to the support arm via the fastening elements. The fastening elements are preferably arranged in robustly designed areas of the arm cover and the support arm.

Das Anschlagelement für die Spindel kann in die Armabdeckung integriert sein oder als separates Einsatzelement, das in einen Lagersitz in der Armabdeckung eingepasst ist, oder als Lagerelement, das in einen Lagersitz in der Armabdeckung eingepasst ist, ausgebildet sein. Der Lagersitz für das separate Einsatzelement und der Lagersitz für das Lagerelement sind bevorzugt in die Armabdeckung integriert. Die Armabdeckung ist bevorzugt als Gussteil aus einem Metallwerkstoff gefertigt. Bei Gussteilen lassen sich Lagersitze, Verstärkungsstreben und sonstige Funktionselemente einfach integrieren.The spindle stop member may be integral with the arm cover, or formed as a separate insert member fitted into a bearing seat in the arm cover, or as a bearing member fitted into a bearing seat in the arm cover. The bearing seat for the separate insert element and the bearing seat for the bearing element are preferably integrated into the arm cover. The arm cover is preferably made as a cast part from a metal material. Bearing seats, reinforcement struts and other functional elements can be easily integrated into cast parts.

In einer bevorzugten Ausführung weist der Tragarm im Bereich des zweiten Endes einen ersten Lagersitz und einen zweiten Lagersitz auf, wobei ein erstes Lagerelement im ersten Lagersitz und ein zweites Lagerelement im zweiten Lagersitz angeordnet ist. Die Spindel wird über das erste Lagerelement und das zweite Lagerelement, die voneinander beabstandet am Tragarm angeordnet sind, am Tragarm gelagert. Die Lagerung der Spindel über zwei voneinander beabstandete Lagerelemente hat gegenüber einem einzelnen Lagerelement den Vorteil, dass das Kippmoment der Spindel geringer ist. Je grösser der Abstand des ersten und zweiten Lagerelementes ist, umso geringer ist das Kippmoment der Spindel.In a preferred embodiment, the support arm has a first bearing seat and a second bearing seat in the region of the second end, with a first bearing element being arranged in the first bearing seat and a second bearing element being arranged in the second bearing seat. The spindle is mounted on the support arm via the first bearing element and the second bearing element, which are arranged at a distance from one another on the support arm. The bearing of the spindle via two spaced-apart bearing elements has the advantage over a single bearing element that the tilting moment of the spindle is lower. The greater the distance between the first and second bearing element, the lower the tilting moment of the spindle.

Bevorzugt ist die Armabdeckung aus einem Metallwerkstoff gefertigt. Eine Armabdeckung aus einem Metallwerkstoff hat gegenüber gewöhnlichen Armabdeckungen aus Kunststoffen den Vorteil, dass aufgrund des höheren Elastizitätsmoduls auftretende Kräfte von der Armabdeckung weitergeleitet werden können, ohne dass die Armabdeckung beschädigt wird.The arm cover is preferably made of a metal material. An arm cover made of a metal material has the advantage over conventional arm covers made of plastics that, due to the higher modulus of elasticity, forces that occur can be passed on by the arm cover without the arm cover being damaged.

Besonders bevorzugt ist die Armabdeckung aus einem Leichtmetallwerkstoff gefertigt. Als Leichtmetallwerkstoffe eignen sich beispielsweise Aluminium und Magnesium. Leichtmetallwerkstoffe reduzieren das Gewicht der Armabdeckung im Vergleich zu Metallwerkstoffen, wie Stahl.The arm cover is particularly preferably made of a light metal material. Aluminum and magnesium, for example, are suitable as light metal materials. Light metal materials reduce the weight of the arm cover compared to metal materials such as steel.

In einer bevorzugten Ausführung ist das Anschlagelement in Form eines Einsatzelementes ausgebildet, wobei das Einsatzelement in einem Lagersitz, der in der Armabdeckung ausgebildet ist, angeordnet ist. Der Lagersitz in der Armabdeckung ist bevorzugt in die Armabdeckung integriert. Durch die Ausbildung des Anschlagelementes als Einsatzelement, das in einen Lagersitz in der Armabdeckung eingepasst ist, kann Verschleiß reduziert werden. Die Auswahl der Materialien für die Spindel und das Einsatzelement können aneinander angepasst werden. Die Anpassung der Materialien ist besonders wichtig, da die Spindel gegenüber dem Einsatzelement um eine Drehachse bewegt wird.In a preferred embodiment, the stop member is in the form of an insert member, the insert member being located in a bearing seat formed in the arm cover. The bearing seat in the arm cover is preferably integrated into the arm cover. Wear can be reduced by designing the stop element as an insert element which is fitted into a bearing seat in the arm cover. The selection of the materials for the spindle and the insert element can be adapted to one another. The matching of the materials is particularly important since the spindle is moved about an axis of rotation relative to the insert element.

In einer weiteren bevorzugten Ausführung ist das Anschlagelement in Form eines weiteren Lagerelementes ausgebildet, wobei das weitere Lagerelement in einem Lagersitz, der in der Armabdeckung ausgebildet ist, angeordnet ist. Der Lagersitz in der Armabdeckung ist bevorzugt in die Armabdeckung integriert. Durch die Ausbildung des Anschlagelementes als weiteres Lagerelement kann Verschleiß reduziert werden. Zum einen kann die Auswahl der Materialien für die Spindel und das weitere Lagerelement aneinander angepasst werden. Ein Anschlagelement in Form eines weiteren Lagerelementes, beispielsweise eines Kugellagers, hat zusätzlich den Vorteil, dass zwischen der Spindel und der Innenseite des Kugellagers nur geringe Relativbewegungen auftreten und Verschleiß weiter reduziert wird.In a further preferred embodiment, the stop element is designed in the form of a further bearing element, the further bearing element being arranged in a bearing seat which is formed in the arm cover. The bearing seat in the arm cover is preferably integrated into the arm cover. Wear can be reduced by designing the stop element as a further bearing element. On the one hand, the choice of materials for the spindle and the additional bearing element can be matched to one another. A stop element in the form of a further bearing element, for example a ball bearing, has the additional advantage that only small relative movements occur between the spindle and the inside of the ball bearing and wear is further reduced.

In einer bevorzugten Ausführung ist die Spindel über das erste und zweite Lagerelement im Tragarm und über ein weiteres Lagerelement in der Armabdeckung gelagert. Das weitere Lagerelement in der Armabdeckung kann im Betrieb des handgeführten Trennschleifers als Anschlagelement Kräfte über die Spindel aus dem Tragarm ableiten.In a preferred embodiment, the spindle is mounted in the support arm via the first and second bearing element and in the arm cover via a further bearing element. The additional bearing element in the arm cover can derive forces from the support arm via the spindle when the hand-held cut-off machine is in operation as a stop element.

Besonders bevorzugt ist das erste Lagerelement als Festlager und das weitere Lagerelement als Loslager für die Spindel ausgebildet. Die Ausbildung des weiteren Lagerelementes in der Armabdeckung als Loslager verhindert eine geometrische Überbestimmung für die Spindel im Ruhezustand. Das weitere Lagerelement wird in den Lagersitz in der Armabdeckung eingepasst (Presssitz) und die Armabdeckung kann mit dem weiteren Lagerelement auf die Spindel geschoben werden. Anschließend wird die Armabdeckung mittels der Befestigungselemente am Tragarm befestigt.The first bearing element is particularly preferably designed as a fixed bearing and the further bearing element is designed as a floating bearing for the spindle. The design of the additional bearing element in the arm cover as a floating bearing prevents geometric overdetermination for the spindle when it is at rest. The further bearing element is fitted into the bearing seat in the arm cover (press fit) and the arm cover can be pushed onto the spindle with the further bearing element. The arm cover is then attached to the support arm using the fasteners.

Ausführungsbeispieleexemplary embodiments

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung beschrieben. Diese soll die Ausführungsbeispiele nicht notwendigerweise maßstäblich darstellen, vielmehr ist die Zeichnung, wo zur Erläuterung dienlich, in schematischer und/oder leicht verzerrter Form ausgeführt. Dabei ist zu berücksichtigen, dass vielfältige Modifikationen und Änderungen betreffend die Form und das Detail einer Ausführungsform vorgenommen werden können, ohne von der allgemeinen Idee der Erfindung abzuweichen. Die allgemeine Idee der Erfindung ist nicht beschränkt auf die exakte Form oder das Detail der im Folgenden gezeigten und beschriebenen bevorzugten Ausführungsform oder beschränkt auf einen Gegenstand, der eingeschränkt wäre im Vergleich zu dem in den Ansprüchen beanspruchten Gegenstand. Bei gegebenen Bemessungsbereichen sollen auch innerhalb der genannten Grenzen liegende Werte als Grenzwerte offenbart und beliebig einsetzbar und beanspruchbar sein. Der Einfachheit halber sind nachfolgend für identische oder ähnliche Teile oder Teile mit identischer oder ähnlicher Funktion gleiche Bezugszeichen verwendet.Exemplary embodiments of the invention are described below with reference to the drawing. This is not necessarily intended to represent the exemplary embodiments to scale; instead, the drawing is in schematic and/or slightly distorted form where it is useful for explanation. In this context, it must be taken into account that a wide variety of modifications and changes relating to the form and detail of an embodiment can be made without deviating from the general idea of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below, or limited to a subject matter which would be limited compared to the subject matter claimed in the claims. In the case of given design ranges, values lying within the specified limits should also be disclosed as limit values and should be able to be used and claimed as desired. For the sake of simplicity, the same reference numbers are used below for identical or similar parts or parts with an identical or similar function.

Es zeigen:

FIGN. 1A, B
einen erfindungsgemäßen handgeführten Trennschleifer mit einer Trennscheibe, einem Motorgehäuse und einem Ausleger mit einer montierten Armabdeckung (FIG. 1A) und einer demontierten Armabdeckung (FIG. 1B);
FIGN. 2A, B
die Armabdeckung des Auslegers der FIG. 1A in einer Ansicht auf die Innenseite mit einem Anschlagelement, das als Einsatzelement (FIG. 2A) oder als Lagerelement (FIG. 2B) ausgebildet ist; und
FIG. 3
den Ausleger des in FIG. 1A dargestellten handgeführten Trennschleifers in einem Schnitt entlang der Schnittlinie A-A in FIG. 1A.
Show it:
FIGN. 1A, B
a hand-held cut-off machine according to the invention with a cut-off wheel, a motor housing and a boom with a mounted arm cover ( FIG. 1A ) and a disassembled arm cover ( FIG. 1B );
FIGN. 2A, B
the arm cover of the boom of the FIG. 1A in a view of the inside with a stop element, which as an insert element ( FIG. 2A ) or as a bearing element ( FIG. 2 B ) is trained; and
FIG. 3
the outrigger of the in FIG. 1A illustrated hand-held cut-off machine in a section along the section line AA in FIG. 1A .

FIGN. 1A , B zeigen ein erfindungsgemäßes handgeführtes Werkzeuggerät 10, das in Form eines handgeführten Trennschleifers ausgebildet ist. Der handgeführte Trennschleifer 10 weist ein als Trennscheibe 11 ausgebildetes Bearbeitungswerkzeug auf, das auf einer Spindel 12 angeordnet ist und um eine Drehachse 13 drehbar ist. Der handgeführte Trennschleifer 10 umfasst neben der Trennscheibe 11 ein Motorgehäuse 14 mit einer Antriebseinheit 15 und einen Ausleger 16 mit einem Tragarm 17 und einer Armabdeckung 18. Die Armabdeckung 18 ist über Befestigungselemente 19, die als Schrauben ausgebildet sein können, am Tragarm 17 befestigt. FIG. 1A zeigt den handgeführten Trennschleifer 10 mit der befestigten Armabdeckung 18 und FIG. 1B zeigt den handgeführten Trennschleifer 10 ohne die Armabdeckung 18. FIGN. 1A , B show a hand-held power tool 10 according to the invention, which is designed in the form of a hand-held cut-off grinder. The hand-held cut-off machine 10 has a processing tool designed as a cutting disc 11 which is arranged on a spindle 12 and can be rotated about an axis of rotation 13 . In addition to the cutting disc 11, the hand-held cut-off machine 10 includes a motor housing 14 with a drive unit 15 and a boom 16 with a support arm 17 and an arm cover 18. The arm cover 18 is attached to the support arm 17 via fastening elements 19, which can be designed as screws. FIG. 1A 12 shows the hand-held power cutter 10 with the arm cover 18 and attached FIG. 1B shows the hand-held power cutter 10 without the arm cover 18.

Der Antrieb der Trennscheibe 11 erfolgt über die Antriebseinheit 15, eine im Ausleger 16 angeordnete Übertragungseinrichtung 21, die im gezeigten Ausführungsbeispiel als Riemenantrieb ausgebildet ist, und die Spindel 12. Unter dem Begriff "Antriebseinheit" werden sämtliche Antriebskomponenten zusammengefasst, die im Motorgehäuse 14 angeordnet sind. Im Motorgehäuse 14 ist ein nicht dargestellter Antriebsmotor angeordnet, der im gezeigten Ausführungsbeispiel ein Verbrennungsmotor ist, aber auch ein Elektromotor sein kann. Zwischen dem Antriebsmotor und dem Riemenantrieb 21 kann eine Fliehkraftkupplung angeordnet sein, die dafür sorgt, dass sich die Trennscheibe 11 bei geringen Drehzahlen, wie im Leerlauf oder beim Starten des handgeführten Trennschleifers 10, nicht dreht; außerdem können weitere Getriebekomponenten zwischen dem Antriebsmotor und der Übertragungseinrichtung 21 angeordnet sein.The cutting wheel 11 is driven via the drive unit 15, a transmission device 21 arranged in the boom 16, which is designed as a belt drive in the exemplary embodiment shown, and the spindle 12. The term "drive unit" summarizes all drive components that are arranged in the motor housing 14 . A drive motor, not shown, is arranged in the motor housing 14 and is an internal combustion engine in the exemplary embodiment shown, but can also be an electric motor. A centrifugal clutch can be arranged between the drive motor and the belt drive 21, which ensures that the cutting disc 11 does not rotate at low speeds, such as when idling or when starting the hand-held cut-off machine 10; in addition, further transmission components can be arranged between the drive motor and the transmission device 21 .

Der Antriebsmotor treibt eine Antriebswelle und eine Antriebsscheibe 22 an. Ein als Antriebsriemen ausgebildetes Übertragungselement 23 ist über die Antriebsscheibe 22 und eine auf der Spindel 12 gelagerte Abtriebsscheibe 24 geführt. Die Antriebsscheibe 22, der Antriebsriemen 23 und die Abtriebsscheibe 24 bilden den Riemenantrieb 21. Die Übertragungseinrichtung 21 kann alternativ zum Riemenantrieb beispielsweise in Form eines Kettenantriebes ausgebildet sein, bei dem das Übertragungselement zwischen der Antriebsscheibe 22 und der Abtriebsscheibe 24 nicht als Antriebsriemen, sondern als Kette ausgebildet ist.The drive motor drives a drive shaft and drive pulley 22 . A transmission element 23 designed as a drive belt is guided over the drive pulley 22 and a driven pulley 24 mounted on the spindle 12 . The drive pulley 22, the drive belt 23 and the driven pulley 24 form the belt drive 21. As an alternative to the belt drive, the transmission device 21 can be designed, for example, in the form of a chain drive in which the transmission element between the drive pulley 22 and the driven pulley 24 is not a drive belt but a chain is trained.

Die Übertragungseinrichtung 21, die die Spindel 12 mit der Antriebseinheit 15 verbindet, ist im Ausleger 16 angeordnet. Die Armabdeckung 18 dient unter anderem dazu, die rotierenden Komponenten der Übertragungseinrichtung 21 abzudecken und die Verletzungsgefahr zu reduzieren, dass der Bediener im Betrieb des handgeführten Trennschleifers 10 in die rotierenden Komponenten der Übertragungseinrichtung 21 greift. Der Tragarm 17 des Auslegers 16 ist an einem ersten Ende 25 am Motorgehäuse 14 festgelegt und an einem zweiten Ende 26 des Tragarms 17 ist die Spindel 12 mittels eines nicht dargestellten Lagerelementes festgelegt.The transmission device 21, which connects the spindle 12 to the drive unit 15, is arranged in the boom 16. The arm cover 18 is used, among other things, to cover the rotating components of the transmission device 21 and to reduce the risk of injury from the operator reaching into the rotating components of the transmission device 21 when the hand-held cut-off machine 10 is in operation. The support arm 17 of the boom 16 is fixed at a first end 25 to the motor housing 14 and at a second end 26 of the support arm 17, the spindle 12 is fixed by means of a bearing element, not shown.

Die Trennscheibe 11 ist von einer Schutzhaube 27 umgeben, die zum Schutz des Bedieners vor umherfliegenden Staubpartikeln dient und außerdem die Verletzungsgefahr reduziert, dass der Bediener im Betrieb des handgeführten Trennschleifers 10 in die rotierende Trennscheibe 11 greift. Zur Bedienung des handgeführten Trennschleifers 10 ist ein erster Handgriff 28 vorgesehen, der als Top-Handle ausgebildet und oberhalb des Motorgehäuses 14 angeordnet ist. Alternativ kann der erste Handgriff als Rear-Handle, der auf der der Trennscheibe 11 abgewandten Seite des Motorgehäuses 14 angeordnet ist, ausgebildet sein. Zur Führung des handgeführten Trennschleifers 10 ist neben dem ersten Handgriff 28 ein zweiter Handgriff 29 vorgesehen, der zwischen der Trennscheibe 11 und dem ersten Handgriff 28 angeordnet ist. Der zweite Handgriff 29 ist im gezeigten Ausführungsbeispiel der FIGN. 1A, B als separates Griffrohr ausgebildet oder kann alternativ einteilig mit dem Motorgehäuse 14 ausgebildet sein.The cutting disk 11 is surrounded by a protective hood 27 which serves to protect the operator from dust particles flying around and also reduces the risk of injury from the operator reaching into the rotating cutting disk 11 when the hand-held cut-off grinder 10 is in operation. A first handle 28 , which is designed as a top handle and is arranged above the motor housing 14 , is provided for operating the hand-held cut-off machine 10 . Alternatively, the first handle can be designed as a rear handle, which is arranged on the side of the motor housing 14 facing away from the cutting disk 11 . In addition to the first handle 28 , a second handle 29 , which is arranged between the cutting disk 11 and the first handle 28 , is provided for guiding the hand-held cut-off machine 10 . The second handle 29 is in the embodiment shown FIGN. 1A , B designed as a separate grip tube or alternatively can be designed in one piece with the motor housing 14 .

FIGN. 2A , B zeigen die Armabdeckung 18 des Auslegers 16 der FIG. 1A in einer Ansicht auf die Innenseite mit einem Anschlagelement, das als Einsatzelement 31 (FIG. 2A) oder als Lagerelement 32 (FIG. 2B) ausgebildet ist. FIGN. 2A , B show the arm cover 18 of the boom 16 of FIG FIG. 1A in a view of the inside with a stop element, which as an insert element 31 ( FIG. 2A ) or as a bearing element 32 ( FIG. 2 B ) is trained.

Die Armabdeckung 18 ist Teil des Auslegers 16 und wird mittels der Befestigungselemente 19, die beispielsweise als Schrauben ausgebildet sind, am Tragarm 17 befestigt. Die Armabdeckung 18 und der Tragarm 17 können als Gussteile aus einem Metallwerkstoff gefertigt sein, aus Gewichtsgründen insbesondere als Gussteile aus einem Leichtmetallwerkstoff. Um die Stabilität und Steifigkeit der Armabdeckung 18 zu erhöhen, weist die Armabdeckung 18 mehrere Verstärkungsstreben 33 auf.The arm cover 18 is part of the cantilever 16 and is fastened to the support arm 17 by means of the fastening elements 19 which are in the form of screws, for example. The arm cover 18 and the support arm 17 can be manufactured as cast parts from a metal material, for reasons of weight in particular as cast parts from a light metal material. In order to increase the stability and rigidity of the arm cover 18, the arm cover 18 has a plurality of reinforcement struts 33.

Die Verwendung eines Metallwerkstoffes für die Armabdeckung 18 ermöglicht es, Kräfte in die Armabdeckung 18 einzuleiten, ohne dass die Armabdeckung 18 beschädigt wird. Gewöhnliche Armabdeckungen für handgeführte Trennschleifer aus Kunststoff sind wegen des geringeren Elastizitätsmoduls für die Einleitung von Kräften ungeeignet; sie dienen ausschließlich zur Abdeckung der rotierenden Komponenten der Übertragungseinrichtung 21.The use of a metal material for the arm cover 18 enables forces to be introduced into the arm cover 18 without the arm cover 18 being damaged. Ordinary arm covers for hand-held cut-off machines made of plastic are unsuitable for the introduction of forces because of their lower modulus of elasticity; they serve exclusively to cover the rotating components of the transmission device 21.

Während des Betriebs des handgeführten Trennschleifers 10 kommt es einer Bewegung der Spindel 12, die über Lagerelemente im Tragarm 17 geführt ist. Je höher die auftretenden Kräfte sind, umso grösser wird die Bewegung der Spindel 12 in einer Ebene senkrecht zur Drehachse 13. Um die Bewegung der Spindel 12 in der Ebene senkrecht zur Drehachse 13 im Betrieb zu begrenzen, ist im Bereich des zweiten Endes 26 der Armabdeckung 18 ein Anschlagelement vorgesehen. Das Anschlagelement ermöglicht es im Betrieb des handgeführten Trennschleifers 10 einen Teil der auftretenden Kräfte in die Armabdeckung 18 umzuleiten und dadurch die Belastung des Tragarms 17 im Bereich seines zweiten Endes 26 zu verringern. Wenn die Spindel 12 am Anschlagelement anschlägt, wird zumindest ein Teil der Kräfte von der Spindel 12 an das Anschlagelement übertragen und vom Anschlagelement in die Armabdeckung 18 weitergeleitet. Da die Armabdeckung 18 über die Befestigungselemente 19 am Tragarm 17 befestigt ist, werden die Kräfte von der Armabdeckung 18 über die Befestigungselemente 19 wieder an den Tragarm 17 übertragen.During operation of the hand-held cut-off machine 10, the spindle 12 moves, which is guided via bearing elements in the support arm 17. The higher the forces that occur, the greater the movement of the spindle 12 in a plane perpendicular to the axis of rotation 13. In order to limit the movement of the spindle 12 in the plane perpendicular to the axis of rotation 13 during operation, the arm cover is in the area of the second end 26 18 a stop element is provided. The stop element makes it possible during operation of the hand-held cut-off machine 10 to divert part of the forces that occur into the arm cover 18 and thereby to reduce the load on the support arm 17 in the area of its second end 26 . When the spindle 12 strikes the stop member, at least a portion of the forces are transmitted from the spindle 12 to the stop member and into the arm cover 18 from the stop member. Since the arm cover 18 is attached to the bracket 17 via the fasteners 19 , the forces are transmitted from the arm cover 18 to the bracket 17 via the fasteners 19 again.

Die Befestigung der Armabdeckung 18 am Tragarm 17 erfolgt über die Befestigungselemente 19. Die Überleitung der Kräfte aus der Armabdeckung 18 in den Tragarm 17 erfolgt ebenfalls über die Befestigungselemente 19. Dazu sind an der Armabdeckung 18 Schraubdome 34 vorgesehen, in die die Schrauben 19 eingeschraubt werden. Die Schraubdome 34 werden insbesondere so angeordnet, dass die Kräfte von der Armabdeckung 18 in robuste und stabile Bereiche des Tragarms 17 übergeleitet werden.The arm cover 18 is fastened to the support arm 17 via the fastening elements 19. The forces are also transferred from the arm cover 18 to the support arm 17 via the fastening elements 19. For this purpose, screw bosses 34 are provided on the arm cover 18, into which the screws 19 are screwed . The screw domes 34 are in particular arranged in such a way that the forces are transferred from the arm cover 18 to robust and stable areas of the support arm 17 .

FIG. 2A zeigt die Armabdeckung 18 mit einem Anschlagelement, das als Einsatzelement 31 ausgebildet ist. In der Armabdeckung 18 ist ein Lagersitz 35 ausgebildet, in den das Einsatzelement 31 eingepasst ist. Das Einsatzelement 31 weist eine Innenkontur 36 auf, die im Betrieb des handgeführten Trennschleifers 10 als Anschlagfläche für die Spindel 12 dient und die Bewegung der Spindel 12 in einer Ebene senkrecht zur Drehachse 13 begrenzt. Um den Verschleiß zwischen der Spindel 12 und dem Einsatzelement 31 zu begrenzen, können die Materialien der Spindel 12 und des Einsatzelementes 31 aneinander angepasst werden. Die Anpassung der Materialien ist besonders wichtig, da die Spindel 12 gegenüber dem Einsatzelement 31 um eine Drehachse bewegt wird. FIG. 2A shows the arm cover 18 with a stop element, which is designed as an insert element 31. FIG. In the arm cover 18, there is formed a bearing seat 35 into which the insert member 31 is fitted. The insert element 31 has an inner contour 36 which serves as a stop surface for the spindle 12 during operation of the hand-held cut-off machine 10 and limits the movement of the spindle 12 in a plane perpendicular to the axis of rotation 13 . In order to limit wear between the spindle 12 and the insert element 31, the materials of the spindle 12 and the insert element 31 can be matched. The matching of the materials is particularly important since the spindle 12 is moved relative to the insert element 31 about an axis of rotation.

FIG. 2B zeigt die Armabdeckung 18 mit einem Anschlagelement, das als Lagerelement 32 ausgebildet ist. In der Armabdeckung 18 ist ein Lagersitz 37 ausgebildet, in den das Lagerelement 32 eingepasst ist. Um Verschleiß zwischen der Spindel 12 und dem Lagerelement 32 zu begrenzen, können die Materialien der Spindel 12 und des Lagerelementes 32 aneinander angepasst werden. Das Lagerelement 32, beispielsweise in Form eines Kugellagers, hat zusätzlich den Vorteil, dass zwischen der Spindel 12 und der Innenseite des Kugellagers nur geringe Relativbewegungen auftreten und Verschleiß gegenüber dem Einsatzelement 31 weiter reduziert wird. FIG. 2 B shows the arm cover 18 with a stop element, which is designed as a bearing element 32. FIG. In the arm cover 18, there is formed a bearing seat 37 into which the bearing member 32 is fitted. In order to limit wear between the spindle 12 and the bearing element 32, the materials of the spindle 12 and the bearing element 32 can be matched. The bearing element 32, for example in the form of a ball bearing, has the additional advantage that only small relative movements occur between the spindle 12 and the inside of the ball bearing and wear on the insert element 31 is further reduced.

FIG. 3 zeigt den Ausleger 16 des handgeführten Trennschleifers 10 der FIG. 1A in einem Schnitt durch die Spindel 12, wobei in der Armabdeckung 18 ein Anschlagelement 41 für die Spindel 12 vorgesehen ist. Das Anschlagelement 41 ist als Lagerelement für die Spindel 12 ausgebildet und kann beispielsweise durch das Lagerelement 32 der FIG. 2B ersetzt werden. FIG. 3 shows the arm 16 of the hand-held cut-off machine 10 of FIG FIG. 1A in a section through the spindle 12, a stop element 41 for the spindle 12 being provided in the arm cover 18. The stop element 41 is designed as a bearing element for the spindle 12 and can, for example, by the bearing element 32 of FIG. 2 B be replaced.

Der handgeführte Trennschleifer 10 umfasst die Trennscheibe 11, das Motorgehäuse 14 mit der Antriebseinheit 15 und den Ausleger 16 mit dem Tragarm 17 und der Armabdeckung 18. Die Trennscheibe 11 ist mittels eines Flansches 42 auf der Spindel 12 befestigt und um die Drehachse 13 drehbar ausgebildet. Die Bewegung der Antriebseinheit 15 wird über die Antriebsscheibe 22, den Antriebsriemen 23 und die Abtriebsscheibe 24 auf die Spindel 12 übertragen; die Abtriebsscheibe 24 ist drehfest auf der Spindel 12 angeordnet.The hand-held cut-off machine 10 comprises the cut-off wheel 11, the motor housing 14 with the drive unit 15 and the boom 16 with the support arm 17 and the arm cover 18. The cut-off wheel 11 is fastened to the spindle 12 by means of a flange 42 and is designed to be rotatable about the axis of rotation 13. The movement of the drive unit 15 is transmitted to the spindle 12 via the drive pulley 22, the drive belt 23 and the driven pulley 24; the output disk 24 is arranged on the spindle 12 in a rotationally fixed manner.

Die Spindel 12 ist über ein erstes Lagerelement 43 und ein zweites Lagerelement 44 am Tragarm 17 gelagert. Der Tragarm 17 weist im Bereich seines zweiten Endes 26 einen ersten Lagersitz 45 und einen zweiten Lagersitz 46 auf. Das erste Lagerelement 43 ist in den ersten Lagersitz 45 und das zweite Lagerelement 44 in den zweiten Lagersitz 46 eingepasst. Die Lagerung der Spindel 12 über die voneinander beabstandeten ersten und zweiten Lagerelemente 43, 44 hat gegenüber einem einzelnen Lagerelement den Vorteil, dass das Kippmoment der Spindel 12 geringer ist. Je grösser der Abstand des ersten und zweiten Lagerelementes 43, 44 ist, umso geringer ist das Kippmoment der Spindel 12.The spindle 12 is mounted on the support arm 17 via a first bearing element 43 and a second bearing element 44 . The support arm 17 has a first bearing seat 45 and a second bearing seat 46 in the region of its second end 26 . The first bearing member 43 is fitted in the first bearing seat 45 and the second bearing member 44 is fitted in the second bearing seat 46 . The bearing of the spindle 12 via the spaced-apart first and second bearing elements 43, 44 has the advantage over a single bearing element that the tilting moment of the spindle 12 is lower. The greater the distance between the first and second bearing elements 43, 44, the lower the tilting moment of the spindle 12.

In der Armabdeckung 18 ist ein Lagersitz 47 vorgesehen, in den das Anschlagelement 41 eingepasst ist. Das Anschlagelement 41 ist als weiteres Lagerelement für die Spindel 12 ausgebildet und wird auch als drittes Lagerelement bezeichnet. Das erste Lagerelement 43 ist als Festlager für die Spindel 12 ausgebildet und das dritte Lagerelement 41 ist als Loslager für die Spindel 12 ausgebildet. Die Ausbildung des dritten Lagerelementes 41 in der Armabdeckung 18 als Loslager verhindert eine geometrische Überbestimmung für die Spindel 12 im Ruhezustand des Trennschleifers 10. Das dritte Lagerelement 41 wird in den Lagersitz 47 in der Armabdeckung 18 eingepasst (Presssitz) und die Armabdeckung 18 kann mit dem dritten Lagerelement 41 auf die Spindel 12 geschoben werden. Anschließend wird die Armabdeckung 18 mittels der Befestigungselemente 19 am Tragarm 17 befestigt. Im Betrieb des handgeführten Trennschleifers 10 begrenzt das Anschlagelement 41 die Bewegung der Spindel 12 in einer Ebene 48 senkrecht zur Drehachse 13.In the arm cover 18, there is provided a bearing seat 47 into which the stopper member 41 is fitted. The stop element 41 is designed as a further bearing element for the spindle 12 and is also referred to as the third bearing element. The first bearing element 43 is designed as a fixed bearing for the spindle 12 and the third bearing element 41 is designed as a floating bearing for the spindle 12 . The design of the third bearing element 41 in the arm cover 18 as a floating bearing prevents a geometric overdetermination for the spindle 12 when the cut-off machine 10 is at rest. The third bearing element 41 is fitted into the bearing seat 47 in the arm cover 18 (press fit) and the arm cover 18 can be connected to the third bearing element 41 are pushed onto the spindle 12. Subsequently, the arm cover 18 is fastened to the support arm 17 by means of the fastening elements 19 . During operation of the hand-held cut-off machine 10, the stop element 41 limits the movement of the spindle 12 in a plane 48 perpendicular to the axis of rotation 13.

Claims (8)

  1. Handheld cutoff grinder (10), having:
    ▪ a cutting disk (11), which is arranged on a spindle (12) and is rotatable about an axis of rotation (13),
    ▪ a motor housing (14) with a drive unit (15), wherein the spindle (12) is connected to the drive unit (15) via a transmission device (21), and
    ▪ a cantilever (16) with an arm cover (18) and a support arm (17), which is fixed by a first end (25) on the motor housing (14) and on the second end (26) of which the spindle (12) is fixed by means of a bearing element (43, 44), wherein the arm cover (18) is fastened on the support arm (17) by means of fastening elements (19),
    characterized in that a stop element (31, 32; 41) is provided in the arm cover (18) for the spindle (12), wherein the stop element (31, 32; 41) limits the movement of the spindle (12) in a plane (48) perpendicular to the axis of rotation (13) during operation.
  2. Cutoff grinder according to Claim 1, characterized in that the support arm (17) has a first bearing seat (45) and a second bearing seat (46) in the region of the second end (26), wherein a first bearing element (43) is arranged in the first bearing seat (45), and a second bearing element (44) is arranged in the second bearing seat (46).
  3. Cutoff grinder according to either of Claims 1 and 2, characterized in that the arm cover (18) is manufactured from a metal material.
  4. Cutoff grinder according to Claim 3, characterized in that the arm cover (18) is manufactured from a light metal material.
  5. Cutoff grinder according to any one of Claims 1 to 4, characterized in that the stop element is in the form of an insert element (31), wherein the insert element (31) is arranged in a bearing seat (35), which is formed in the arm cover (18).
  6. Cutoff grinder according to any one of Claims 1 to 4, characterized in that the stop element is in the form of a further bearing element (32; 41), wherein the further bearing element (32; 41) is arranged in a bearing seat (37; 47), which is formed in the arm cover (18).
  7. Cutoff grinder according to Claim 2, characterized in that the spindle (12) is mounted in the support arm (17) by means of the first and second bearing elements (43, 44) and is mounted in the arm cover (18) by means of a further bearing element (41).
  8. Cutoff grinder according to Claim 7, characterized in that the first bearing element (43) is designed as a fixed bearing and the further bearing element (41) as a floating bearing for the spindle (12).
EP19756416.4A 2018-09-10 2019-08-28 Hand-held abrasive cut-off machine Active EP3849743B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18020443.0A EP3620262A1 (en) 2018-09-10 2018-09-10 Hand-held abrasive cut-off machine
PCT/EP2019/072899 WO2020052974A1 (en) 2018-09-10 2019-08-28 Hand-held cutting grinder

Publications (2)

Publication Number Publication Date
EP3849743A1 EP3849743A1 (en) 2021-07-21
EP3849743B1 true EP3849743B1 (en) 2022-07-06

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EP18020443.0A Withdrawn EP3620262A1 (en) 2018-09-10 2018-09-10 Hand-held abrasive cut-off machine
EP19756416.4A Active EP3849743B1 (en) 2018-09-10 2019-08-28 Hand-held abrasive cut-off machine

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EP18020443.0A Withdrawn EP3620262A1 (en) 2018-09-10 2018-09-10 Hand-held abrasive cut-off machine

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US (1) US20220048154A1 (en)
EP (2) EP3620262A1 (en)
WO (1) WO2020052974A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3670077B1 (en) * 2018-12-21 2024-05-15 Hilti Aktiengesellschaft Hand-held abrasive cut-off machine
EP4140647A1 (en) * 2021-08-24 2023-03-01 Hilti Aktiengesellschaft Profile structure for a component of a machine tool and machine tool with a profile structure
SE545708C2 (en) * 2022-04-04 2023-12-12 Husqvarna Ab A reinforced tool arm for a power cutter

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Publication number Priority date Publication date Assignee Title
US2367432A (en) * 1941-04-28 1945-01-16 Reprogle Frank Surgical saw
US2344262A (en) * 1943-11-10 1944-03-14 Odierna Ernest Surgical cast cutter
US4599927A (en) * 1985-05-08 1986-07-15 Emerson Electric Co. Tool elevation and bevel adjustment for direct drive power tool
JPH0540926Y2 (en) * 1986-10-22 1993-10-18
US7121445B2 (en) * 2003-04-22 2006-10-17 Credo Technology Corporation Power tool housing
DE10325663B4 (en) 2003-06-06 2023-03-16 Andreas Stihl Ag & Co. Kg cutter
DE102004036584B4 (en) * 2004-07-28 2019-08-01 Robert Bosch Gmbh Power tool
JP2006289571A (en) * 2005-04-13 2006-10-26 Hitachi Koki Co Ltd Power tool
US7134209B1 (en) * 2005-05-23 2006-11-14 Molenaar Steven L Disc cutter
JP5760658B2 (en) * 2011-04-29 2015-08-12 日立工機株式会社 Portable work machine
DE102013012746A1 (en) * 2013-07-31 2015-02-05 Andreas Stihl Ag & Co. Kg Hand-held implement
JP6248705B2 (en) * 2014-03-03 2017-12-20 日立工機株式会社 Portable cutting machine
DE102014205563A1 (en) * 2014-03-26 2015-10-01 Robert Bosch Gmbh Hand-operated machine tool
AU2014414862B2 (en) * 2014-12-22 2020-10-22 Husqvarna Ab Fastener retention device for a guard cover
EP3173188A1 (en) 2015-11-25 2017-05-31 HILTI Aktiengesellschaft Portable, hand held cutting-off machine

Also Published As

Publication number Publication date
EP3849743A1 (en) 2021-07-21
EP3620262A1 (en) 2020-03-11
US20220048154A1 (en) 2022-02-17
WO2020052974A1 (en) 2020-03-19

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