EP3612352B1 - Capot anti-poussière pour une tronçonneuse à disque - Google Patents

Capot anti-poussière pour une tronçonneuse à disque Download PDF

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Publication number
EP3612352B1
EP3612352B1 EP18724784.6A EP18724784A EP3612352B1 EP 3612352 B1 EP3612352 B1 EP 3612352B1 EP 18724784 A EP18724784 A EP 18724784A EP 3612352 B1 EP3612352 B1 EP 3612352B1
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EP
European Patent Office
Prior art keywords
cut
dust hood
flap
grinder
contact
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.)
Active
Application number
EP18724784.6A
Other languages
German (de)
English (en)
Other versions
EP3612352A2 (fr
Inventor
Kevin KUHLMANN
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
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP3612352A2 publication Critical patent/EP3612352A2/fr
Application granted granted Critical
Publication of EP3612352B1 publication Critical patent/EP3612352B1/fr
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • 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
    • 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
    • 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
    • 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
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00

Definitions

  • the present invention relates to a dust hood with a flange for attaching the dust hood to a gear neck of a cut-off machine.
  • the dust hood is equipped with a hood body for at least partially covering a circular cutting disc on both sides, and with a suction connection for connecting a suction hose. Any debris removed from the subsoil can be sucked out of the hood body via the suction hose.
  • Dust hoods of the type mentioned are basically known from the prior art (see EP 2 937 031 A1 ). They serve to prevent dust from spreading during cutting work, in order to protect the health of the user of the cut-off machine.
  • the dust hood has a sensor unit, by means of which it can be detected whether the suction hose is connected to the suction connection and/or whether a flap of the suction connection is open.
  • the invention includes the knowledge that cut-off grinders in practical use, ie for dry cutting for example, are used both with dust extraction and without dust extraction.
  • a circular cutting disc of the power cutter typically rotates in the same direction of rotation in order to keep the user of the power cutter away from removing the subsoil.
  • the blade is typically driven in the opposite direction of rotation, which allows better control of the kerf. It has been recognized that the possibility of operating a cut-off machine in different directions of rotation can lead to operating errors, which in turn mean an undesirable exposure to dust for the user. This is the case, for example, when the flap of the suction socket is open and no suction hose is connected to the suction socket.
  • the dust hood according to the invention creates a basis for avoiding such operating errors.
  • the sensor unit provided according to the invention can, for example, for the purpose Direction of rotation specification for the cutting disc of the cut-off grinder are fed to a cut-off grinder. If, for example, the flap of the suction nozzle is open and no suction hose is plugged into the suction nozzle, it is possible to automatically specify a co-rotating direction of the cutting disc, which is typically selected when no dust extraction takes place. If, on the other hand, the flap of the suction socket is open and the suction hose is inserted into the suction socket or connected to it, an opposite direction of rotation is preferably specified, since proper dust suction can be ensured.
  • the dust hood has a signal line via which a sensor signal originating from the sensor unit can be tapped, preferably for the purpose of specifying the direction of rotation for the cutting disc of the cut-off grinder.
  • One or more interfaces can be provided on the flange, for example on an inner surface of the flange, which correspond to one or more interfaces on the gear neck of the angle grinder.
  • the interface can have one or more electrical contact areas.
  • the sensor unit has a flap contact, by means of which it can be detected whether the flap of the suction connection is open or closed.
  • the sensor unit can have a connection piece contact, by means of which it can be detected whether the suction hose is connected to the suction connection piece.
  • the sensor unit has a hood contact, by means of which it can be detected whether the dust hood is connected to the cut-off machine.
  • the sensor signal of a hood contact can be evaluated by the cut-off machine, for example, in such a way that rotation of the cut-off wheel is prevented if no dust hood is connected to the cut-off machine.
  • the flap contact, the socket contact and the hood contact can be provided in the form of a switch, a button, a magnetic contact or a light barrier.
  • a sensor unit can also have a combination of switches, buttons or the like.
  • the flap contact is provided in the form of an on/off slide switch.
  • the sliding switch is preferably actuated by the flap of the suction connection.
  • the flap of the suction connection is preferably shaped in such a way that the slide switch is actuated when the flap is opened.
  • the flap contact and the hood contact can also be functionally integrated, for example in the form of an on/off/on toggle switch, which is preferably actuated by the flap of the suction nozzle.
  • an on/off/on toggle switch which is preferably actuated by the flap of the suction nozzle.
  • the closed flap presses the toggle switch into a first on position
  • the open flap presses the toggle switch into a second on position
  • the toggle switch assumes the off position (e.g. middle position) when the dust hood is not arranged on a cut-off machine.
  • a mechanical transmission path can be provided inside the dust hood between the flap and the flange, for example in the form of a mechanical tappet, so that the toggle switch can be arranged in the area of the flap on the socket and at the same time is able to detect, in terms of hood contact, whether the dust hood connected to the cutter.
  • the flap contact and the socket contact are provided in the form of two buttons. It is preferably provided that the closed flap actuates the first button and the second button is actuated when the suction hose is inserted in the suction connection.
  • the buttons can be arranged in such a way that when the flap is open and the suction hose is not connected to the suction nozzle, neither of the two buttons is pressed, which preferably causes the rotation control electronics to prevent rotation of the cutting disc of the power cutter.
  • the sensor unit has only the flap contact, preferably in the form of a button.
  • the flap contact, the neck contact and/or the hood contact can be provided in many forms.
  • the flap contact and the socket contact can be provided in the form of two light barriers, with a closed flap interrupting the first light barrier, and an open flap and/or a plugged-in suction hose preferably interrupting the second light barrier.
  • a rotation of the blade is prevented by the direction of rotation control electronics when neither the first nor the second light barrier is interrupted.
  • the flap contact is provided in the form of a light barrier. This can be arranged in such a way that the open flap of the suction connection interrupts the light barrier and the closed flap does not interrupt the light barrier.
  • the flap contact and the socket contact can be provided in the form of magnetic contacts, for example reed switches.
  • a closed flap preferably closes a first magnetic switch.
  • a plugged-in suction hose can close a second magnetic switch. It is preferably provided that when the flap is open and the suction hose is not plugged in, none of the magnetic switches is actuated and—in relation to the cut-off grinder—a rotation of the cut-off wheel is prevented in this case.
  • the object is also achieved by a cut-off machine with a dust hood of the type described above with a gear neck, the cut-off machine having direction-of-rotation control electronics which, when the dust hood is connected, are signal-connected to the sensor unit via an interface in such a way that, depending on a sensor signal originating from the sensor unit, the Direction of rotation of the cutting disc of the cutter can be specified or is specified.
  • direction of rotation control electronics are designed to prevent rotation of the cutting disc when no dust hood is connected to the cut-off machine.
  • the cut-off grinder is preferably a hand-held power tool.
  • the cut-off grinder is particularly preferably battery-operated, i.e. in particular it does not have a mains cable.
  • the method can be further developed in a corresponding manner by the features described above with reference to the devices.
  • the object is also achieved by a hand-held power tool system having a cut-off machine of the type described above and a dust hood of the type described above.
  • FIG. 1 shows a preferred embodiment of a dust hood 100 according to the invention, which is arranged on a cut-off machine 200 according to the invention.
  • the dust hood 100 has a hood body 10 for covering a circular cutting disk 220 on both sides at least in sections.
  • the dust hood 100 is also equipped with a suction connection 40 for connecting a suction hose 400.
  • the suction connection 40 and the suction hose 400 can be used to suck off a subsoil UG in the form of dust from a cutting guide (not shown here) from the hood body 10.
  • the dust hood 100 has a sensor unit 20, by means of which it can be detected whether a flap 45 of the suction connection 40 is open.
  • the sensor unit 20 has a flap contact 21, by means of which it can be detected whether the flap 45 of the suction connection 11 is open or closed.
  • the flap contact 21 is designed as an on/off slide switch, which is arranged on the suction nozzle 40 in such a way that when the flap 45 is opened, the slide switch is actuated to the on position.
  • the dust hood 100 has a signal line 80, via which the sensor signal SL originating from the sensor unit 20 can be tapped, specifically for the purpose of specifying the direction of rotation for the cutting disc 220 of the cut-off grinder 200.
  • the cut-off machine 200 itself has direction-of-rotation control electronics 230, which, when the dust hood 100 is connected, can be controlled via an interface (cf. 3 : Interface 240) is signal-connected to the sensor unit 20.
  • an interface cf. 3 : Interface 240
  • the direction of rotation of the turntable 220 can be predetermined.
  • the flap 45 of the suction port 40 is closed.
  • the flap contact 21 of the sensor unit 20 is connected to the direction of rotation control electronics 230 via the signal line 80 . It is provided, for example, that when the valve is in the state 1 the flap contact 21 is electrically opened in the form of a slide switch and the direction of rotation control electronics 230 is set up such that when the cut-off machine 200 is started up, the cut-off wheel 220 is driven in the same direction of rotation GLD. This corresponds to dry cutting without dust extraction.
  • the flap contact 21 When the flap 45 is open (not shown here), the flap contact 21 would be electrically closed in the form of a slide switch, so that the direction of rotation control electronics 230 now controls the cut-off machine 200 in such a way that when the cut-off machine 200 is put into operation, the cut-off wheel 220 is driven in the opposite direction of rotation GGD. This would correspond to dry cutting with dust extraction. It should be noted here that dust hood 100 of 1 is not set up to detect whether the suction hose 400 is actually connected to the suction nozzle 40.
  • the sensor unit 20 has a flap contact 21, by means of which it can be detected whether the flap 45 of the suction connection 11 is open or closed.
  • the sensor unit 20 has a connection piece contact 23, by means of which it can be detected whether the suction hose 20 is connected to the suction connection piece 40.
  • the flap contact 21 is provided in the form of a button to be actuated by the opening flap 45 .
  • the connection piece contact 23 is provided in the form of a button provided inside the suction connection piece 40 which, for example, closes when the suction hose 400 is inserted into the suction connection piece 40 .
  • the flap contact 21 is actuated in the form of a button, i.e. it is electrically closed.
  • the direction of rotation specified by the direction of rotation control electronics 230 is for the opposite direction of rotation GLD of the cutting disc 220.
  • the specified direction of rotation depends on the switching state of the socket contact 23.
  • the socket contact 23 is actuated in the form of the button on the inside, i.e. it is electrically closed.
  • the switching status of the flap contact 21 and the socket contact 23 is passed on to the direction of rotation control electronics 230 in the form of a now purely electrical sensor signal SL, which now specifies an opposite direction of rotation GGD of the cutting disc 220 .
  • the correspondingly configured rotation control electronics 230 prevent the cutting disc 220 from rotating despite the actuation of the cut-off machine. This is because it must be assumed that the dust passing through the opened flap 45 would damage the user of the angle grinder 200.
  • 3 serves essentially to explain how the sensor unit 20 is preferably to be coupled to the direction of rotation control electronics 230 .
  • the sensor unit 20 has a flap contact 21, by means of which it can be detected whether the flap 45 of the suction nozzle 11 is open or closed. Furthermore, the sensor unit has a hood contact 25, by means of which it can be detected whether the dust hood 100 is connected to the cut-off machine 200.
  • the flap contact 21 and the hood contact 25 can be provided, for example, in the form of buttons, but also in the form of magnetic switches.
  • the dust hood 100 has a signal line 80 via which sensor signals SL originating from the flap contact 21 and the hood contact 25 can be tapped.
  • the signal line 80 runs through the flange 90 of the dust hood to an electrical interface 240 on the flange.
  • the gear neck has a corresponding interface 240, from which the sensor signal SL reaches the rotary direction control electronics 230 of the cut-off machine.
  • a sensor unit included in the dust hood is used to detect whether a suction hose is connected to the suction connection and/or whether a flap of the suction connection is open.
  • the direction of rotation of the cut-off wheel of the cut-off machine is controlled as a function of the state detected by the sensor unit.

Landscapes

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

Claims (10)

  1. Capot anti-poussière (100) comprenant une bride (90) pour la fixation du capot anti-poussière (100) sur un col de transmission (210) d'une tronçonneuse à disque (200), et comprenant un corps de capot (10) pour le recouvrement au moins par sections, des deux côtés, d'un disque de coupe circulaire (220), et comprenant une tubulure d'aspiration (40) pour le raccordement d'un tuyau d'aspiration (400) par l'intermédiaire duquel un enlèvement de substrat (UG) peut être aspiré hors du corps de capot (10), caractérisé en ce que le capot anti-poussière (100) présente une unité de capteur (20) au moyen de laquelle il peut être détecté si le tuyau d'aspiration (400) est raccordé à la tubulure d'aspiration (40) et/ou si un clapet (45) de la tubulure d'aspiration (40) est ouvert.
  2. Capot anti-poussière (100) selon la revendication 1,
    caractérisé en ce que le capot anti-poussière (100) présente une ligne de signal (80) par laquelle un signal de capteur (SL) provenant de l'unité de capteur (20) peut être prélevé, de préférence dans le but de prédéfinir une direction de rotation pour le disque de coupe (220) de la tronçonneuse à disque (200).
  3. Capot anti-poussière (100) selon la revendication 1 ou 2,
    caractérisé en ce que la ligne de signal (80) passe à travers la bride (90) du capot anti-poussière (100).
  4. Capot anti-poussière (100) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'unité de capteur (20) présente un contact de clapet (21) au moyen duquel il peut être détecté si le clapet (45) de la tubulure d'aspiration (11) est ouvert ou fermé.
  5. Capot anti-poussière (100) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'unité de capteur (20) présente un contact de tubulure (23) au moyen duquel il peut être détecté si le tuyau d'aspiration (20) est raccordé à la tubulure d'aspiration (40).
  6. Capot anti-poussière (100) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'unité de capteur (20) présente un contact de capot (25) au moyen duquel il peut être détecté si le capot anti-poussière (100) est raccordé à la tronçonneuse à disque (200).
  7. Capot anti-poussière (100) selon l'une quelconque des revendications 4 à 6,
    caractérisé en ce que le contact de clapet (21), le contact de tubulure (23) et/ou le contact de capot (25) sont fournis sous la forme d'un interrupteur, d'un palpeur, d'un contact magnétique ou d'une barrière lumineuse.
  8. Tronçonneuse à disque (200) comprenant un capot anti-poussière (100) selon l'une quelconque des revendications précédentes, comprenant un col de transmission (210), caractérisée en ce que la tronçonneuse à disque (200) présente un système électronique de commande de la direction de rotation (230), qui, lorsque le capot anti-poussière (100) est raccordé, est relié en communication de signaux par l'intermédiaire d'une interface (240) à l'unité de capteur (20), de telle sorte que la direction de rotation (GGD, GLD) du disque de coupe (220) de la tronçonneuse à disque (200) peut être prédéfinie en fonction d'un signal de capteur (SL) provenant de l'unité de capteur (20).
  9. Tronçonneuse à disque (200) selon la revendication 8,
    caractérisée en ce que le système électronique de commande de la direction de rotation (230) est configuré pour empêcher une rotation du disque de coupe (220) lorsqu'aucun capot anti-poussière (100) n'est raccordé à la tronçonneuse à disque (100).
  10. Procédé d'exploitation d'une tronçonneuse à disque, la tronçonneuse à disque présentant un capot anti-poussière équipé d'une tubulure d'aspiration, et le procédé comprenant les étapes suivantes :
    - (S1) la détection, au moyen d'une unité de capteur comprise par le capot anti-poussière, de si un tuyau d'aspiration est raccordé à la tubulure d'aspiration et/ou de si un clapet de la tubulure d'aspiration est ouvert,
    - (S2) la commande d'une direction de rotation du disque de coupe de la tronçonneuse à disque en fonction de l'état détecté par l'unité de capteur.
EP18724784.6A 2017-04-20 2018-04-16 Capot anti-poussière pour une tronçonneuse à disque Active EP3612352B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17167204.1A EP3391995A1 (fr) 2017-04-20 2017-04-20 Capot anti-poussière pour une tronçonneuse
PCT/EP2018/059652 WO2018192869A2 (fr) 2017-04-20 2018-04-16 Capot anti-poussière pour une tronçonneuse à disque

Publications (2)

Publication Number Publication Date
EP3612352A2 EP3612352A2 (fr) 2020-02-26
EP3612352B1 true EP3612352B1 (fr) 2022-06-08

Family

ID=58638680

Family Applications (2)

Application Number Title Priority Date Filing Date
EP17167204.1A Withdrawn EP3391995A1 (fr) 2017-04-20 2017-04-20 Capot anti-poussière pour une tronçonneuse
EP18724784.6A Active EP3612352B1 (fr) 2017-04-20 2018-04-16 Capot anti-poussière pour une tronçonneuse à disque

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP17167204.1A Withdrawn EP3391995A1 (fr) 2017-04-20 2017-04-20 Capot anti-poussière pour une tronçonneuse

Country Status (4)

Country Link
US (1) US20200122292A1 (fr)
EP (2) EP3391995A1 (fr)
CN (1) CN110536776B (fr)
WO (1) WO2018192869A2 (fr)

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EP3825062A1 (fr) * 2019-11-21 2021-05-26 Hilti Aktiengesellschaft Procédé de fonctionnement d'une machine-outil et machine-outil
US20230381920A1 (en) * 2022-05-25 2023-11-30 Raytheon Technologies Corporation Machine control for grinding machine

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Also Published As

Publication number Publication date
CN110536776B (zh) 2021-12-24
EP3612352A2 (fr) 2020-02-26
EP3391995A1 (fr) 2018-10-24
US20200122292A1 (en) 2020-04-23
CN110536776A (zh) 2019-12-03
WO2018192869A3 (fr) 2018-12-13
WO2018192869A2 (fr) 2018-10-25

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