EP3391995A1 - Dust hood for an angle grinder - Google Patents

Abstract

Dust hood (100) with a flange (90) for attaching the dust cover (100) to a gear neck (210) of a cutting grinder (200), and with a hood body (10) for at least partially covering both sides of a circular cutting disc (220), and with a suction nozzle (40) for connecting a suction hose (400) through which a Untergroundabtrag (UG) from the hood body (10) can be sucked off, wherein the dust hood (100) has a sensor unit (20) by means of which can be detected whether the Suction hose (20) is connected to the suction nozzle (40) and / or whether a flap (45) of the suction nozzle (40) is opened.

Description

The present invention relates to a dust hood with a flange for attaching the dust hood to a gear neck of a cutting grinder. The dust hood is equipped with a hood body for at least sections, covering both sides of a circular cutting disc, and with a suction nozzle for connecting a suction hose. About the suction hose, a background abrasion can be sucked out of the hood body.

Dust hoods of the type mentioned are basically known from the prior art. They serve to prevent dust spreading during cutting operations in order to protect the health of a user of the cut-off grinder.

It is an object of the present invention to provide a dust hood, which provides the basis for a safer separation operation.

The object is achieved in that the dust hood has a sensor unit, by means of which it can be detected whether the suction hose is connected to the suction nozzle and / or whether a flap of the suction nozzle is open.

The invention includes the realization that cut-off grinders are put into practical use, that is to say for example in dry cutting, both with dust extraction and without dust extraction. In dry cutting without dust extraction, a circular cutting disc of the cutting grinder typically rotates in the same direction of rotation to keep a subsurface away from the user of the cutting grinder. When dry cutting with dust extraction, the cutting wheel is typically driven in the opposite direction of rotation, which allows better control of the kerf. It has been recognized that the ability to operate a power cutter in various directions of rotation can lead to operator errors, which in turn impose an undesirable level of dust on the user. This is the case, for example, when the flap of the suction nozzle is opened and no suction hose is connected to the suction nozzle.

The dust hood of the invention provides a basis for avoiding such operator errors. The inventively provided sensor unit can, for example, purpose Direction of rotation for the cutting disc of the cut-off wheel is fed to a cut-off grinder. Thus, if, for example, the flap of the extraction nozzle is open and no suction hose is inserted into the extraction nozzle, it is possible to automatically specify a co-rotating direction of rotation of the separation disk, which is typically selected when no dust extraction takes place. If, on the other hand, the flap of the extraction nozzle is open and the suction hose is inserted into the extraction nozzle or connected to it, preferably an opposite direction of rotation is predetermined, since proper dust extraction can be ensured.

In a particularly preferred embodiment, the dust hood has a signal line, via which a sensor signal originating from the sensor unit can be tapped off, preferably for the purpose of indicating the direction of rotation for the cutting disk of the cut-off grinder.

It has proven to be advantageous if the signal line is guided through the flange of the dust hood. On the flange, for example on an inner surface of the flange, one or more interfaces may be provided, which correspond with one or more interfaces on the gear neck of the cutting grinder. In the simplest case, the interface may have one or more electrical contact areas.

It has proven to be advantageous if the sensor unit has a flap contact, by means of which it can be detected whether the flap of the suction nozzle is open or closed. Alternatively or additionally, the sensor unit may have a nozzle contact, by means of which it can be detected whether the suction hose is connected to the suction nozzle.

In a particularly preferred embodiment of the dust hood, 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, for example, such that rotation of the cutting disc is prevented when no dust hood is connected to the cutting grinder.

Various designs of the flap contact, the socket contact and the hood contact are conceivable. Thus, the flap contact, the socket contact and / or the hood contact may be provided, for example in the form of a switch, a button, a magnetic contact or a light barrier. Likewise, a sensor unit may comprise a combination of switches, buttons or the like.

In a first preferred embodiment, the flap contact is provided in the form of an on / off slide switch. Preferably, the slide switch is actuated by the flap of the suction nozzle. Preferably, the flap of the suction nozzle is shaped such that the slide switch is actuated when opening the flap. By operating the slide switch, the signal line in the form of an electrical loop can either be opened or closed and preferably based on this purely electrical signal, a direction of rotation control electronics of the cutting grinder are controlled.

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. Thus, for example, be provided that the closed flap pushes the toggle switch in a first on position, the open flap pushes the toggle switch in a second on position and / or the toggle switch assumes the off position (for example, center position) when the dust hood not arranged on a cut-off machine. Within the dust hood, a mechanical transmission path between the flap and the flange may be provided, for example in the form of a mechanical plunger, so that the toggle switch can be arranged in the region of the flap on the nozzle and at the same time is able to detect in the sense of the hood contact, if the dust hood connected to the cut-off machine.

In a further preferred embodiment, the flap contact and the nozzle 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 nozzle. The buttons may be arranged so that when the flap is opened and the suction hose is not connected to the suction nozzle, neither of the two buttons is pressed, which preferably causes the rotary control electronics prevents rotation of the cutting disc of the cutting grinder. In a further preferred embodiment, the sensor unit has only the flap contact, preferably in the form of a button.

As already indicated, the flap contact, the socket contact and / or the hood contact can be provided in many forms. For example, the flap contact and the socket contact can be provided in the form of two light barriers, wherein a closed flap interrupts the first light barrier, an opened flap and / or a plugged-in suction hose preferably interrupts the second light barrier. Here can be provided that rotation of the cutting disc is prevented by the direction of rotation control electronics when neither the first nor the second light barrier is interrupted.

In a further embodiment, preferably only the flap contact is provided in the form of a light barrier. This can be arranged such that the open flap of the suction pipe interrupts the light barrier and the closed flap does not interrupt the light barrier.

In a further embodiment, the flap contact and the socket contact in the form of magnetic contacts, such as reed switches, may be provided. In this case, a closed flap preferably closes a first magnetic switch. A plugged suction hose can close a second magnetic switch. Preferably, it is provided that with the flap open and not plugged suction hose none of the magnetic switch is actuated and - based on the power cutter - a rotation of the blade is prevented in this case.

The above-described functions of the flap contact, the socket contact and / or the hood contact can of course also be logically inverted.

The object is likewise achieved by a power cutter having a gear neck for connecting a dust hood of the type described above, wherein the power cutter has a direction of rotation control electronics, which is signal-connected with an attached dust hood via an interface with the sensor unit, such that depending on a sensor signal originating from the sensor unit the direction of rotation of the cutting wheel of the cutting grinder can be specified or specified.

It has proven to be advantageous if the direction of rotation control electronics is designed to prevent rotation of the cutting disc when no dust hood is connected to the cutting grinder.

Preferably, the power cutter is a hand tool. Most preferably, the abrasive grinder is battery powered, i. especially free from a power cord.

• Detektieren, mittels einer von der Staubhaube umfassten Sensoreinheit, ob ein Saugschlauch im Absaugstutzen angeschlossen ist und/oder ob eine Klappe des Absaugstutzens geöffnet ist,
• Steuern einer Drehrichtung der Trennscheibe des Trennschleifers in Abhängigkeit des von der Sensoreinheit detektierten Zustands.

The object is also achieved by a method for operating a cut-off grinder, wherein the cut-off machine has a dust hood equipped with a suction nozzle, and the method comprises the steps:

• Detecting, by means of a sensor unit comprised of the dust hood, whether a suction hose is connected in the suction nozzle and / or whether a flap of the suction nozzle is open,
• Controlling a direction of rotation of the cutting wheel of the cutting grinder as a function of the state detected by the sensor unit.

The method may be further developed by the features described above with respect to the devices described above.

The object is also achieved by a hand power tool system having a power cutter of the type described above and a dust hood of the type described above.

Further advantages will become apparent from the following description of the figures. In the figures, various embodiments of the present invention are shown. The figures, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

In the figures, identical and similar components are numbered with the same reference numerals.

• Fig. 1 ein bevorzugtes Ausführungsbeispiel einer erfindungsgemäßen Staubhaube angeordnet an einem erfindungsgemäßen Trennschleifer;
• Fig. 2 ein weiteres bevorzugtes Ausführungsbeispiel eines erfindungsgemäßen Trennschleifers mit Staubhaube;
• Fig. 3 ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Trennschleifers mit Staubhaube, wobei die Staubhaube nicht an dem Trennschleifer angeschlossen ist; und
• Fig. 4 ein erfindungsgemäßes Verfahren zum Betreiben eines Trennschleifers.

Show it:

• Fig. 1 a preferred embodiment of a dust hood according to the invention arranged on a cutting grinder according to the invention;
• Fig. 2 a further preferred embodiment of a cutting grinder according to the invention with dust hood;
• Fig. 3 a further embodiment of a cutting grinder according to the invention with dust hood, wherein the dust hood is not connected to the cutting grinder; and
• Fig. 4 an inventive method for operating a cutting grinder.

EXAMPLES

Fig. 1 shows a preferred embodiment of a dust hood 100 according to the invention, which is arranged on a grinder 200 according to the invention. The dust hood 100 has a hood body 10 for at least partially covering both sides of a circular cutting disk 220. The dust hood 100 is also equipped with a suction nozzle 40 for connecting a suction hose 400. About the suction nozzle 40 and the suction hose 400, a substrate removal UG in the form of dust from a Schnittfuhr not shown here, be sucked out of 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 nozzle 40 is open.

In the presently illustrated embodiment, 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. The flap contact 21 is formed as an on / off slide switch, which is arranged on the suction nozzle 40, that when opening the flap 45 of the slide switch is actuated in the on position.

The dust hood 100 has a signal line 80, via which sensor signal SL originating from the sensor unit 20 can be tapped, specifically for the purpose of indicating the direction of rotation of the cutting disk 220 of the cutting-off grinder 200.

The cut-off machine 200 itself has a direction of rotation control electronics 230 which, when the dust hood 100 is connected, are connected via an interface (cf. Fig. 3 : Interface 240) is signal-connected to the sensor unit 20. Depending on the originating from the sensor unit 20 sensor signal SL, the direction of rotation of the hub 220 can be specified.

Im in Fig. 1 illustrated embodiment, the flap 45 of the suction nozzle 40 is closed. The flap contact 21 of the sensor unit 20 is connected via the signal line 80 with the direction of rotation control electronics 230. By way of example, it is provided that the flap state of Fig. 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 cutting grinder 200 is put into operation, the cutting disc 220 is driven in the same direction of rotation GLD. This corresponds to a dry cutting operation without dust extraction.

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 controls the cutter then that in the case of a start-up of the cutter 200, the cutter 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 Fig. 1 is not adapted to detect whether the suction hose 400 is actually connected to the suction nozzle 40.

However, this is in the embodiment of Fig. 2 the case. 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. In addition, the sensor unit 20 has a nozzle contact 23, by means of which it can be detected whether the suction hose 20 is connected to the suction nozzle 40. The flap contact 21 is provided in the form of a button to be actuated by the opening flap 45. The nozzle contact 23 is provided in the form of a provided within the suction nozzle 40 button, which closes here by way of example, when the suction hose 400 is inserted into the suction nozzle 40.

With the flap 45 closed (shown here) the flap contact 21 is actuated in the form of a button, i. electrically closed. The direction of rotation command instructed by the direction of rotation control electronics 230 is in the opposite direction of rotation GLD of the cutting disc 220.

If the flap 45 is open and the flap contact 21 in the form of the button is not actuated, i. electrically open, the direction of rotation depends on the switching state of the socket contact 23.

If the suction hose 400 is inserted into the suction nozzle 40, the nozzle contact 23 is actuated in the form of the inside button, i. electrically closed. The switching state of the flap contact 21 and the socket contact 23 is transmitted in the form of a now purely electrical sensor signal SL to the direction of rotation control electronics 230, which now specifies an opposite direction of rotation GGD the blade 220.

If, by contrast, with the flap 45 open, the suction hose 400 is not inserted into the suction nozzle 40, then the correspondingly established rotary control electronics 230 causes a rotation of the cutting disk 220 to be inhibited despite actuation of the cut-off grinder. This is because it must be assumed that the dust passing through the opened flap 45 would damage the user of the abrasive cutter 200.

Fig. 3 essentially serves to explain how the sensor unit 20 is preferably to be coupled with the direction of rotation control electronics 230.

In the embodiment of Fig. 3 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 angle grinder 200. The flap contact 21 and the hood contact 25 may be provided for example in the form of buttons, but also in the form of magnetic switches.

Again Fig. 3 can be removed well, the dust cover 100 has a signal line 80, can be tapped on the coming from the flap contact 21 and the hood contact 25 sensor signals SL. In order now to enable a signal transmission to the dust hood 100 to the power cutter 200, more precisely, the direction of rotation control electronics 230, the signal line 80 extends through the flange 90 of the dust hood towards an electrical interface 240 on the flange. The Getriebehals has a corresponding interface 240, from which the sensor signal SL reaches the direction of rotation control electronics 230 of the cutting grinder.

Fig. 4 Finally, FIG. 3 shows a method for operating a cut-off grinder, for example a cut-off grinder FIGS. 1 to 3 , In a first method step S1, detection takes place by means of a sensor unit comprised by the dust hood, if a suction hose is connected to the suction nozzle and / or if a flap of the suction nozzle is opened. In a second step S2, a control of the direction of rotation of the cutting disk of the cut-off wheel is effected as a function of the state detected by the sensor unit.

LIST OF REFERENCE NUMBERS

10

hood body

20

sensor unit

21

Contact flaps

23

Stutz Contact

25

hood Contact

40

suction

45

flap

80

signal line

90

flange

100

dust cap

200

Power Cut

210

transmission neck

220

cutting wheel

230

Direction of rotation control electronics

240

interface

240

corresponding interface

400

suction

GGD

opposite direction of rotation

GLD

synchronous direction of rotation

SL

sensor signal

S1, S2

steps

UG

Untergrundabtrag

Claims (10)

Dust hood (100) with a flange (90) for attaching the dust cover (100) to a gear neck (210) of a cutting grinder (200), and with a hood body (10) for at least partially covering both sides of a circular cutting disc (220), and with a suction nozzle (40) for connecting a suction hose (400) can be sucked through the a Untergrundabtrag (UG) from the hood body (10),
characterized in that the dust hood (100) has a sensor unit (20) by means of which it can be detected whether the suction hose (400) is connected to the suction nozzle (40) and / or if a flap (45) of the suction nozzle (40) is opened is. Dust hood (100) according to claim 1,
characterized in that the dust hood (100) has a signal line (80) via which a from the sensor unit (20) originating sensor signal (SL) can be tapped, preferably for direction of rotation specification for the cutting disc (220) of the cutting grinder (200). Dust hood (100) according to claim 1 or 2,
characterized in that the signal line (80) through the flange (90) of the dust hood (100) is guided. Dust hood (100) according to one of the preceding claims,
characterized in that 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. Dust hood (100) according to one of the preceding claims,
characterized in that the sensor unit (20) has a nozzle contact (23) by means of which it can be detected whether the suction hose (20) is connected to the suction nozzle (40). Dust hood (100) according to one of the preceding claims,
characterized in that the sensor unit (20) has a hood contact (25) by means of which it can be detected whether the dust hood (100) is connected to the cut-off grinder (200). A dust hood (100) according to any one of claims 4 to 6,
characterized in that the flap contact (21), the socket contact (23) and / or the hood contact (25) in the form of a switch, a button, a magnetic contact or a light barrier is provided. A cutting grinder (200) having a gear neck (210) for connecting a dust hood (100) according to one of the preceding claims, characterized in that the cut-off grinder (200) has a direction of rotation control electronics (230) which, with the dust hood (100) connected, via an interface ( 240) is signal-connected to the sensor unit (20), such that the direction of rotation (GGD, GLD) of the cutting disc (220) of the cut-off grinder (200) can be predetermined as a function of a sensor signal (SL) originating from the sensor unit (20). An abrasive grinder (200) according to claim 9,
characterized in that the direction of rotation control electronics (230) is designed to prevent rotation of the cutting disc (220) when no dust hood (100) is connected to the cut-off grinder (100). Method for operating a cut-off wheel, wherein the cut-off machine has a dust hood equipped with a suction nozzle, the method comprising the steps: Detecting (S1), by means of a sensor unit comprised by the dust hood, whether a suction hose is connected to the suction nozzle and / or whether a flap of the suction nozzle is open, - (S2) controlling a direction of rotation of the cutting wheel of the cut-off wheel in dependence on the detected by the sensor unit state.

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