EP1549463A1 - Manual grinding machine comprising a dust extraction device - Google Patents

Manual grinding machine comprising a dust extraction device

Info

Publication number
EP1549463A1
EP1549463A1 EP03756440A EP03756440A EP1549463A1 EP 1549463 A1 EP1549463 A1 EP 1549463A1 EP 03756440 A EP03756440 A EP 03756440A EP 03756440 A EP03756440 A EP 03756440A EP 1549463 A1 EP1549463 A1 EP 1549463A1
Authority
EP
European Patent Office
Prior art keywords
grinding plate
hand grinder
grinder according
fan wheel
turbo fan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03756440A
Other languages
German (de)
French (fr)
Inventor
Gustav Sieber
Steffen Wuensch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1549463A1 publication Critical patent/EP1549463A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
    • 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
    • B24B23/028—Angle tools
    • 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
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • 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
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
    • 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
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/105—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with oscillating tools

Definitions

  • the present invention is based on a hand grinder according to the preamble of claim 1.
  • Hand tools with electric or compressed air drive are known for grinding workpieces.
  • the torque of the air pressure or electric motors is transferred to the sanding plate or sanding plate and enables appropriate chip removal.
  • the resulting chips or grinding dust are either blown into a dust container coupled with the hand-held power tool by a suction fan that rotates together with the motor, or removed by a suitable vacuum cleaner by means of external suction. They are for the
  • Vacuum cleaners used in most cases oversized for the extraction of grinding dust alone Around 1400 watts of power consumption of the vacuum cleaner contrast with about 300 watts of power consumption of the hand grinder. This means that the performance of the vacuum cleaner is not being used sufficiently.
  • Vacuum cleaner accessories which contain rotating brushes actuated by the exhaust air flow via a drive fan and which are intended in particular for the processing of textile floor coverings. Such brushes are relatively poor in performance and cannot be used as hand sanding tools.
  • the present invention with the features of claim 1 has the advantage that a small, light and inexpensive hand-held machine tool has been created which can be operated as intended solely by connecting a vacuum cleaner suction hose to an intended coupling and in which grinding dust which occurs at the same time can be extracted with high efficiency , This eliminates the need to provide an electric motor and a power supply for the hand machine tool. In addition, the otherwise usual loud noise from electric hand machine tools is eliminated - due to the usual use of high-speed electric motors.
  • a rotatably mounted turbo fan wheel is arranged in the interior of the housing, through which the suction air flow can flow and can be coupled to the grinding plate, creates a simple, light, low-noise and inexpensive hand-held grinding machine with dust extraction.
  • a gear in particular a planetary gear, is arranged between the turbo fan wheel and the grinding plate, a relatively high speed of the turbo fan wheel can be easily converted into a lower speed, which is usual for grinding machines.
  • non-closable openings are provided in the housing of the hand-held grinder for the inlet of inflowing air means that the vacuum cleaner cannot be throttled or overloaded during grinding.
  • turbo fan is guided with a vertical axis via a gear and from there to the sanding plate, a simple and space-saving, flat design of the hand-held grinding machine is possible.
  • FIG. 1 shows a longitudinal section of a hand grinding machine according to the invention
  • FIG. 2 shows a turbo fan wheel with a central planetary gear
  • Figure 3 shows a longitudinal section of an eccentric grinder according to the invention.
  • FIG. 1 shows a longitudinal section of a hand-held grinder 10 according to the invention with a rotating grinding plate 26.
  • the hand-held grinder 10 consists of a housing 12, the curved upper area of which serves as a handle that can be comfortably gripped over with one hand.
  • the housing 12 carries an inner housing 14 which serves as a fan housing for a turbo fan impeller 16 which is mounted in the inner housing 14 so as to be rotatable about a vertical axis 18.
  • the turbo fan wheel 16 is provided with fan blades 17 arranged radially on the outside and a central stub shaft 19, which is coupled in a torque-transmitting manner to a planetary gear 20, which is arranged in a rotationally fixed manner centrally or concentrically to the stub shaft 19 in a gear housing 21, the gear housing 21 being a part of the inner housing 14 is.
  • the fan blades 17 extend radially inward at a small distance from the outer edge of the gear housing 21 and thus form a cavity
  • An output shaft 22 emerges from the bottom of the planetary gear 20 and is encompassed by a shaft bearing 24, which is mounted centrally in the inner housing 14.
  • the output shaft 22 is rotatably connected to a circular grinding plate 26 and together with this rotatable.
  • the grinding plate 26 carries axially continuous air holes 28 through which outside air is sucked into the housing 12, which entrains grinding dust and chips.
  • outside air enters the interior of the housing 12 through air gaps 30 - in accordance with the directional arrows 32. The cross section of these gaps 30 cannot be changed, so that a minimum throughput of air drawn in from the outside is always ensured.
  • Parking brake - not shown - provided, with which the turbo fan wheel 16 can be locked, so that the work function of the hand grinder 10 can be interrupted mechanically and this can be used as a vacuum cleaner head when the turbo fan wheel is locked.
  • FIG. 2 shows the detail of a fan wheel 16 with fan blades 17 arranged radially evenly distributed between two axial disks 25.
  • the output shaft 22 and part of the planetary gear 20 protrude from the lower axial disk 25 from a central recess.
  • FIG. 3 shows a hand-held grinding machine designed as an eccentric grinder 100
  • FIG. 1 The structure is essentially the same as that according to FIG. 1, with corresponding parts being provided with reference numerals changed by a factor of 10 in each case. The details which correspond in this respect are not listed again, but only the differences from FIG. 1:
  • the eccentric grinder 100 is provided with a shortened output shaft 220, which carries at its free end a disc-like compensating mass 360, which in turn carries an eccentric pin 340 parallel to the output shaft 220, which is rotatably arranged in the grinding plate bearing 270.
  • the output shaft 220 therefore forms a crankshaft together with the balancing mass 360 and the eccentric pin 340.
  • the grinding plate 260 experiences a rotating movement when the output shaft 220 rotates, which is superimposed by a rotating movement due to the bearing friction in the grinding plate bearing 270.
  • a brake ring 380 is provided, which extends axially from the inner housing 140 and arranged on the latter in a rotationally fixed manner to the grinding plate 240 and is supported on the end face with a small pretensioning force. If the sanding plate 260 is set in rotation, a constant frictional force acts from the brake ring 380, which can be made of felt, for example, on the surface of the sanding plate 260, whereby the self-rotation of the sanding plate 260 can be limited to a permissible maximum speed.
  • the air holes 280 penetrate the sanding plate 260 radially so far outside of its center that they always remain positioned outside the brake ring 380, so that no sanding dust gets into the sanding plate bearings 270 or the area of the eccentric pin 340 and therefore cannot cause damage there.

Landscapes

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

Abstract

The invention relates to a manual grinding machine (10) comprising a dust extraction device and a grinding plate (26) which is accommodated on the housing (12) and which can be driven in a rotating or oscillating manner. Said manual grinding machine is simple and economical to produce and is easy to drive by virtue of the fact that only the air flow of a vacuum cleaner (42) is used, especially a commercial-type vacuum cleaner, in order to drive the grinding plate (26) and to produce the flow of suctioning air.

Description

Handschleifmaschine mit StaubabsaugungHand grinder with dust extraction
Stand der TechnikState of the art
Die vorliegende Erfindung geht aus von einer Handschleifmaschine nach dem Oberbeg- riff des Anspruchs 1.The present invention is based on a hand grinder according to the preamble of claim 1.
Zum Schleifen von Werkstücken sind Handwerkzeugmaschinen mit Elektro- oder Druckluftantrieb bekannt. Das Drehmoment der Luftdruck- bzw. Elektromotoren wird auf die Schleifplatte oder Schleifteller übertragen und ermöglicht eine entsprechende Spanabtragung.Hand tools with electric or compressed air drive are known for grinding workpieces. The torque of the air pressure or electric motors is transferred to the sanding plate or sanding plate and enables appropriate chip removal.
Die dabei entstehenden Späne bzw. der Schleifstaub wird entweder mittels Eigenabsau- gung durch einen gemeinsam mit dem Motor drehenden Absaugventilator in einen mit der Handwerkzeugmaschine gekuppelten Staubbehälter geblasen oder mittels Fremdab- saugung durch einen geeigneten Staubsauger abtransportiert. Dabei sind die für dieThe resulting chips or grinding dust are either blown into a dust container coupled with the hand-held power tool by a suction fan that rotates together with the motor, or removed by a suitable vacuum cleaner by means of external suction. They are for the
Fremdabsaugung verwendeten Staubsauger in den meisten Fällen für das Absaugen von Schleifstaub allein überdimensioniert. So stehen etwa 1400 Watt Aufnahmeleistung des Staubsaugers etwa 300 Watt Aufnahmeleistung der Handschleifmaschine gegenüber. Damit wird die Leistung des Staubsaugers nur unzureichend genutzt.Vacuum cleaners used in most cases oversized for the extraction of grinding dust alone. Around 1400 watts of power consumption of the vacuum cleaner contrast with about 300 watts of power consumption of the hand grinder. This means that the performance of the vacuum cleaner is not being used sufficiently.
Es sind Staubsaugerzubehörgeräte bekannt, die mit dem Absaugluftstrom über einen Antriebsventilator betätigte rotierende Bürsten enthalten und insbesondere für die Bearbeitung von textilen Fußbodenbelägen vorgesehen sind. Derartige Bürsten sind verhältnismäßig leistungsschwach und nicht als Schleifhandwerkzeug verwendbar. Vorteile der ErfindungVacuum cleaner accessories are known which contain rotating brushes actuated by the exhaust air flow via a drive fan and which are intended in particular for the processing of textile floor coverings. Such brushes are relatively poor in performance and cannot be used as hand sanding tools. Advantages of the invention
Die vorliegende Erfindung mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass eine kleine, leichte und kostengünstige Handwerkzeugmaschine geschaffen wurde, die al- lein durch Anschließen eines Staubsaugerabsaugschlauches an eine vorgesehene Kupplung bestimmungsgemäß betreibbar ist und bei der zugleich anfallender Schleifstaub mit hohem Wirkungsgrad absaugbar ist. Dadurch entfällt die Notwendigkeit, einen Elektromotor und eine Stromversorgung für die Handwerkzeugmaschine zur Verfügung zu stellen. Außerdem entfällt das sonst übliche laute Geräusch von Elektrohandwerkzeugma- schinen - bedingt durch die übliche Verwendung hochdrehender Elektromotoren.The present invention with the features of claim 1 has the advantage that a small, light and inexpensive hand-held machine tool has been created which can be operated as intended solely by connecting a vacuum cleaner suction hose to an intended coupling and in which grinding dust which occurs at the same time can be extracted with high efficiency , This eliminates the need to provide an electric motor and a power supply for the hand machine tool. In addition, the otherwise usual loud noise from electric hand machine tools is eliminated - due to the usual use of high-speed electric motors.
Dadurch, dass im Inneren des Gehäuses ein drehbar gelagertes Turbolüfterrad angeordnet ist, das vom Saugluftstrom durchströmbar ist und mit dem Schleifteller koppelbar ist, ist eine einfach aufgebaute, leichte, geräuscharme und kostengünstige Handschleifmaschine mit Staubabsaugung geschaffen.The fact that a rotatably mounted turbo fan wheel is arranged in the interior of the housing, through which the suction air flow can flow and can be coupled to the grinding plate, creates a simple, light, low-noise and inexpensive hand-held grinding machine with dust extraction.
Dadurch, dass zwischen dem Turbolüfterrad und dem Schleifteller ein Getriebe angeordnet ist, insbesondere ein Planetengetriebe, kann eine verhältnismäßig hohe Drehzahl des Turbolüfterrades bequem in eine, für Schleifmaschinen übliche geringere Drehzahl um- gewandelt werden.Due to the fact that a gear, in particular a planetary gear, is arranged between the turbo fan wheel and the grinding plate, a relatively high speed of the turbo fan wheel can be easily converted into a lower speed, which is usual for grinding machines.
Dadurch, dass nicht verschließbare Öffnungen zum Einlass nachströmender Luft im Gehäuse der Handschleifmaschine vorgesehen sind, ist ein Abdrosseln bzw. Überlastung des Staubsaugers beim Schleifen ausgeschlossen.The fact that non-closable openings are provided in the housing of the hand-held grinder for the inlet of inflowing air means that the vacuum cleaner cannot be throttled or overloaded during grinding.
Dadurch, dass der Turbolüfter mit vertikaler Achse über ein Getriebe und von diesem weiter zum Schleifteller geführt ist, ist eine einfache und platzsparende, flache Bauweise der Handschleifmaschine möglich.Because the turbo fan is guided with a vertical axis via a gear and from there to the sanding plate, a simple and space-saving, flat design of the hand-held grinding machine is possible.
Dadurch, dass der Schleifteller exzentrisch angetrieben ist und mit einem Bremsring bis unter eine zulässige Höchstdrehzahl abbbremsbar ist, ist eine vorteilhaft handhabbare Exzenterschleifmaschine geschaffen. ZeichnungThe fact that the grinding plate is eccentrically driven and can be braked to below a permissible maximum speed with a brake ring creates an advantageously manageable eccentric grinding machine. drawing
Nachstehend ist die Erfindung anhand eines Ausfuhrungsbeispiels mit zugehöriger Zeichnung näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment with the associated drawing.
Es zeigen:Show it:
Figur 1 einen Längsschnitt einer erfindungsgemäßen Handschleifmaschine,FIG. 1 shows a longitudinal section of a hand grinding machine according to the invention,
Figur 2 ein Turbolüfterrad mit zentralem Planetengetriebe,FIG. 2 shows a turbo fan wheel with a central planetary gear,
Figur 3 einen Längsschnitt eines erfindungsgemäßen Exzenterschleifers.Figure 3 shows a longitudinal section of an eccentric grinder according to the invention.
Ausführungsbeispieleembodiments
Figur 1 zeigt einen Längsschnitt einer erfϊndungsgemäßen Handschleifmaschine 10 mit rotierendem Schleifteller 26. Die Handschleifmaschine 10 besteht aus einem Gehäuse 12, deren gewölbter oberer Bereich als Handgriff dient, der bequem mit einer Hand über- greifbar ist.FIG. 1 shows a longitudinal section of a hand-held grinder 10 according to the invention with a rotating grinding plate 26. The hand-held grinder 10 consists of a housing 12, the curved upper area of which serves as a handle that can be comfortably gripped over with one hand.
Das Gehäuse 12 trägt ein Innengehäuse 14, das als Lüftergehäuse für ein Turbolüfterrad 16 dient, das um eine vertikale Achse 18 drehbar im Innengehäuse 14 gelagert ist.The housing 12 carries an inner housing 14 which serves as a fan housing for a turbo fan impeller 16 which is mounted in the inner housing 14 so as to be rotatable about a vertical axis 18.
Das Turbolüfterrad 16 ist mit radial außen angeordneten Lüfterschaufeln 17 und einem mittigen Achsstummel 19 versehen, der drehmomentübertragend mit einem Planetengetriebe 20 gekoppelt ist, das zentral bzw. konzentrisch zum Achsstummel 19 in einem Getriebegehäuse 21 drehfest angeordnet ist, wobei das Getriebegehäuse 21 ein Teil des Innengehäuses 14 ist. Die Lüfterschaufeln 17 erstrecken sich radial nach innen in einem kleinen Abstand zur Außenkante des Getriebegehäuses 21 und bilden so einen HohlraumThe turbo fan wheel 16 is provided with fan blades 17 arranged radially on the outside and a central stub shaft 19, which is coupled in a torque-transmitting manner to a planetary gear 20, which is arranged in a rotationally fixed manner centrally or concentrically to the stub shaft 19 in a gear housing 21, the gear housing 21 being a part of the inner housing 14 is. The fan blades 17 extend radially inward at a small distance from the outer edge of the gear housing 21 and thus form a cavity
23 um das Getriebegehäuse 21 herum.23 around the gear housing 21.
Unten aus dem Planetengetriebe 20 tritt eine Abtriebswelle 22, die von einem Wellenlager 24, zentral im Innengehäuse 14 gelagert, umgriffen wird. Die Abtriebswelle 22 ist drehfest mit einem kreisrunden Schleifteller 26 verbunden und gemeinsam mit diesem drehbar. Der Schleifteller 26 trägt axial durchgehende Luftlöcher 28, durch die Außenluft in das Gehäuse 12 gesaugt wird , die dabei Schleifstaub und Späne mitnimmt. Außerdem tritt Außenluft durch Luftspalte 30 ins Innere des Gehäuses 12 - entsprechend den Richtungspfeilen 32. Diese Spalte 30 sind nicht veränderbar in ihrem Querschnitt, so dass stets ein Mindestdurchsatz an von außen angesaugter Luft gesichert ist. Dabei ist eine Ü- berlastung des außen mittels Staubsauger-Saugrohr 40 an einen Kupplungsstutzen 15 des Gehäuses 12 anschließbaren Staubsaugers 42 ausgeschlossen. Sobald der Staubsauger 42 in Betrieb gesetzt wird, sucht der von außen in das Gehäuse 12 einströmende Luftstrom das Turbolüfterrad 16 in Drehung zu versetzen und damit den Schleifteller 26 rotieren zu lassen.An output shaft 22 emerges from the bottom of the planetary gear 20 and is encompassed by a shaft bearing 24, which is mounted centrally in the inner housing 14. The output shaft 22 is rotatably connected to a circular grinding plate 26 and together with this rotatable. The grinding plate 26 carries axially continuous air holes 28 through which outside air is sucked into the housing 12, which entrains grinding dust and chips. In addition, outside air enters the interior of the housing 12 through air gaps 30 - in accordance with the directional arrows 32. The cross section of these gaps 30 cannot be changed, so that a minimum throughput of air drawn in from the outside is always ensured. In this case, an overload of the vacuum cleaner 42 that can be connected externally by means of a vacuum cleaner suction pipe 40 to a coupling stub 15 of the housing 12 is excluded. As soon as the vacuum cleaner 42 is put into operation, the air flow flowing into the housing 12 from outside tries to set the turbo fan wheel 16 in rotation and thus to let the grinding plate 26 rotate.
Zum kontrollierten Ein- und Ausschalten der Handschleifmaschine 10 ist diese mit einem nicht dargestellten elektrischen Ein- und Ausschalter verbunden, der über eine Steuerleitung über das Staubabsaugrohr zum Motor des Staubsaugers 42 führt. Damit ist dieser quasi wie über eine Fernbedienung ein- und ausschaltbar. Weiter ist am Gehäuse 12 eineFor the controlled switching on and off of the hand-held grinding machine 10, it is connected to an electrical on / off switch, not shown, which leads to the motor of the vacuum cleaner 42 via a control line via the dust extraction pipe. This means that it can be switched on and off like a remote control. Next is on the housing 12
Feststellbremse - nicht dargestellt - vorgesehen, mit der das Turbolüfterrad 16 arretierbar ist, so dass die Arbeitsfunktion der Handschleifmaschine 10 mechanisch unterbrochen werden kann und diese bei arretiertem Turbolüfterrad als Staubsaugkopf einsetzbar ist.Parking brake - not shown - provided, with which the turbo fan wheel 16 can be locked, so that the work function of the hand grinder 10 can be interrupted mechanically and this can be used as a vacuum cleaner head when the turbo fan wheel is locked.
Figur 2 zeigt die Einzelheit eines Lüfterrads 16 mit radial gleichmäßig verteilten zwischen zwei Axialscheiben 25 angeordneten Lüfterschaufeln 17. Aus der unteren Axialscheibe 25 ragt aus einer zentralen Ausnehmung die Abtriebswelle 22 und ein Teil des Planetengetriebes 20.FIG. 2 shows the detail of a fan wheel 16 with fan blades 17 arranged radially evenly distributed between two axial disks 25. The output shaft 22 and part of the planetary gear 20 protrude from the lower axial disk 25 from a central recess.
Figur 3 zeigt eine als Exzenterschleifer 100 ausgestaltete Handschleifmaschine, die imFIG. 3 shows a hand-held grinding machine designed as an eccentric grinder 100
Wesentlichen so aufgebaut ist wie die gemäß Figur 1, wobei übereinstimmende Teile mit jeweils um Faktor 10 geänderten Bezugszeichen versehen sind. Die insoweit übereinstimmenden Einzelheiten werden nicht nochmals aufgeführt, sondern nur die Unterschiede zur Figur 1 :The structure is essentially the same as that according to FIG. 1, with corresponding parts being provided with reference numerals changed by a factor of 10 in each case. The details which correspond in this respect are not listed again, but only the differences from FIG. 1:
Der Exzenterschleifer 100 ist mit einer verkürzten Abtriebswelle 220 versehen, die an ihrem freien Ende eine scheibenartige Ausgleichsmasse 360 trägt, welche wiederum parallel zur Abtriebswelle 220 einen Exzenterstift 340 trägt, der drehbar gelagert im Schleiftellerlager 270 angeordnet ist. Die Abtriebswelle 220 bildet also gemeinsam mit der Aus- gleichsmasse 360 und dem Exzenterstift 340 eine Kurbelwelle. Durch die Kopplung mit dem Exzenterstift 340 erfährt der Schleifteller 260 bei Drehung der Abtriebswelle 220 eine kreisende Bewegung, die infolge der Lagerreibung im Schleiftellerlager 270 von einer rotierenden Bewegung überlagert wird. Damit diese rotierende Bewegung eine Höchstdrehzahl nicht überschreitet, ist ein Bremsring 380 vorgesehen, der sich axial vom Innengehäuse 140 und an diesem drehfest angeordnet zum Schleifteller 240 erstreckt und sich an diesem stirnseitig mit geringer Vorspannkraft abstützt. Wird der Schleifteller 260 in Drehung versetzt, wirkt eine beständige Reibkraft vom Bremsring 380, der z.B. aus Filz bestehen kann, auf die Oberfläche des Schleiftellers 260, wodurch die Eigenrotation des Schleiftellers 260 auf eine zulässige Höchstdrehzahl begrenzbar ist.The eccentric grinder 100 is provided with a shortened output shaft 220, which carries at its free end a disc-like compensating mass 360, which in turn carries an eccentric pin 340 parallel to the output shaft 220, which is rotatably arranged in the grinding plate bearing 270. The output shaft 220 therefore forms a crankshaft together with the balancing mass 360 and the eccentric pin 340. By coupling with the eccentric pin 340, the grinding plate 260 experiences a rotating movement when the output shaft 220 rotates, which is superimposed by a rotating movement due to the bearing friction in the grinding plate bearing 270. So that this rotating movement does not exceed a maximum speed, a brake ring 380 is provided, which extends axially from the inner housing 140 and arranged on the latter in a rotationally fixed manner to the grinding plate 240 and is supported on the end face with a small pretensioning force. If the sanding plate 260 is set in rotation, a constant frictional force acts from the brake ring 380, which can be made of felt, for example, on the surface of the sanding plate 260, whereby the self-rotation of the sanding plate 260 can be limited to a permissible maximum speed.
Die Luftlöcher 280 durchtreten den Schleifteller 260 radial soweit außerhalb von dessen Mitte, dass sie stets außerhalb des Bremsrings 380 positioniert bleiben, so dass kein Schleifstaub in die Schleiftellerlager 270 bzw. den Bereich des Exzenterstiftes 340 gelangt und daher dort nicht zu Schäden führen kann. The air holes 280 penetrate the sanding plate 260 radially so far outside of its center that they always remain positioned outside the brake ring 380, so that no sanding dust gets into the sanding plate bearings 270 or the area of the eccentric pin 340 and therefore cannot cause damage there.

Claims

Patentansprüche claims
1. Handschleifmaschine (10) mit Staubabsaugung, mit einem am Gehäuse (12) drehend und/oder schwingend antreibbar angeordneten Schleifteller (26), dadurch gekennzeichnet, dass zum Antrieb des Schleiftellers (26) sowie zur Erzeugung des Absaug- luftstromes allein der Luftstrom eines insbesondere handelsüblichen, Staubsaugers1. Hand grinder (10) with dust extraction, with a on the housing (12) rotatably and / or swingably arranged grinding plate (26), characterized in that for driving the grinding plate (26) and for generating the suction airflow, the airflow alone especially commercial, vacuum cleaner
(42) dient.(42) serves.
2. Handschleifmaschine nach Anspruch 1, dadurch gekennzeichnet, dass im Inneren des Gehäuses (12) ein Turbolüfterrad (16) drehbar gelagert ist, das vom Saugluftstrom durchströmbar und mit dem Schleifteller (26) koppelbar ist.2. Hand grinder according to claim 1, characterized in that in the interior of the housing (12) a turbo fan wheel (16) is rotatably mounted, through which the suction air flow can flow and can be coupled to the grinding plate (26).
3. Handschleifmaschine nach Anspruch 2, dadurch gekennzeichnet, dass zwischen dem Turbolüfterrad (16) und dem Schleifteller (26) ein Getriebe, insbesondere Planetengetriebe (20) angeordnet ist, wobei eine Schleiftellerhöchstdrehzahl definiert ist.3. Hand grinder according to claim 2, characterized in that between the turbo fan wheel (16) and the grinding plate (26) a gear, in particular planetary gear (20) is arranged, wherein a maximum grinding plate speed is defined.
4. Handschleifmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Gehäuse (12) nicht veränderbare Einströmöffnungen, insbesondere Löcher und Spalten (28, 30) aufweist, durch die ein Nachströmen abzusaugender Luft von außen gesichert ist und eine Überlastung des Staubsaugers (42) ausgeschlossen ist.4. Hand grinder according to one of claims 1 to 3, characterized in that the housing (12) has non-changeable inflow openings, in particular holes and gaps (28, 30), through which an afterflow of air to be extracted is secured from the outside and an overload of the vacuum cleaner (42) is excluded.
5. Handschleifmaschine nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass das Turbolüfterrad (16) mit vertikaler Achse (18) in ein Getriebe (20) greift, wobei das Getriebe (20) die Drehzahl des Schleiftellers (26) bestimmt. 5. Hand grinder according to one of claims 2 to 4, characterized in that the turbo fan wheel (16) with a vertical axis (18) engages in a gear (20), the gear (20) determining the speed of the grinding plate (26).
6. Handschleifmaschine nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass das Turbolüfterrad mit einer horizontalen Welle über ein Winkelgetriebe den Schleifteller antreibt.6. Hand grinder according to one of claims 2 to 5, characterized in that the turbo fan wheel drives the grinding plate with a horizontal shaft via an angular gear.
7. Handschleifmaschine nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass dem Planetengetriebe (20) nachgeschaltet ein Exzenterantrieb zur Erzeugung einer Exzenterbewegung des Schleiftellers (26) angeordnet ist.7. Hand grinder according to one of claims 3 to 6, characterized in that an eccentric drive for generating an eccentric movement of the grinding plate (26) is arranged downstream of the planetary gear (20).
8. Handschleifmaschine nach Anspruch 7, dadurch gekennzeichnet, dass der Exzente- rantrieb über einen mit der Triebsäule (220) gekoppelten Exzenterstift (340) vorgenommen wird, der in dem Schleifteller (260) eingreift, wobei der Schleifteller (260) gleichzeitig über einen Bremsring (380) bezüglich seiner Höchstdrehzahl begrenzbar ist.8. Hand grinder according to claim 7, characterized in that the eccentric drive is made via an eccentric pin (340) coupled to the drive column (220) which engages in the grinding plate (260), the grinding plate (260) simultaneously via a brake ring (380) is limited in terms of its maximum speed.
9. Handschleifmaschine nach Anspruch 2, dadurch gekennzeichnet, dass das Turbolüfterrad (16) mit nur einem einzigen Achsstummel (190), insbesondere fliegend, gelagert ist. 9. Hand grinder according to claim 2, characterized in that the turbo fan wheel (16) with only a single stub shaft (190), in particular flying, is mounted.
EP03756440A 2002-09-30 2003-09-23 Manual grinding machine comprising a dust extraction device Withdrawn EP1549463A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10245692A DE10245692A1 (en) 2002-09-30 2002-09-30 Hand grinder with dust extraction
DE10245692 2002-09-30
PCT/DE2003/003150 WO2004030864A1 (en) 2002-09-30 2003-09-23 Manual grinding machine comprising a dust extraction device

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EP1549463A1 true EP1549463A1 (en) 2005-07-06

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EP (1) EP1549463A1 (en)
JP (1) JP2006508807A (en)
CN (1) CN100400232C (en)
DE (1) DE10245692A1 (en)
WO (1) WO2004030864A1 (en)

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DE102011083430A1 (en) * 2011-09-26 2013-03-28 Robert Bosch Gmbh Machine tool braking device
CN103170912A (en) * 2013-01-22 2013-06-26 熊根稳 Linear polishing machine
CN108890531A (en) * 2018-06-15 2018-11-27 何绮雯 A kind of oscillation drive
CN114833678B (en) * 2022-04-20 2023-05-09 安徽金福瑞家具股份有限公司 Board deburring equipment and deburring method for solid wood furniture processing

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DE10245692A1 (en) 2004-04-08
CN100400232C (en) 2008-07-09
WO2004030864A1 (en) 2004-04-15
WO2004030864A8 (en) 2005-11-17
JP2006508807A (en) 2006-03-16
CN1684797A (en) 2005-10-19

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