Dust cover for a cutting grinder

Abstract

A dust hood (100), including a flange (90) for fastening the dust hood (100) to a transmission extension housing (210) of an angle grinder (200), and including a hood body (10) for covering a circular cutting wheel (220) on both sides, at least in sections, and including a suction connecting piece (40) for connecting a suction hose (400), via which removed substrate material (UG) may be extracted from the hood body (10), the dust hood (100) including a sensor unit (20), with the aid of which it is possible to detect whether the suction hose (20) is connected to the suction connecting piece (40) and/or whether a flap (45) of the suction connecting piece (40) is open.

Claims

1. A method for operating an angle grinder, the angle grinder including a cutting wheel and a dust hood equipped with a suction connecting piece, the method including the steps: detecting whether a suction hose is connected to the suction connecting piece or whether a flap of the suction connecting piece is open with the aid of a sensor unit encompassed by the dust hood; and controlling a rotational direction of the cutting wheel of the angle grinder as a function of the state detected by the sensor unit; wherein the sensor unit includes a flap contact to detect whether the flap is open or closed and a connecting piece contact to detect whether the suction hose is connected to the suction connecting piece; wherein the rotational direction includes a contra-rotating rotational direction corresponding to a dry cutting with dust extraction and a co-rotating direction corresponding to a dry cutting operation without dust extraction.

2. The method as recited in claim 1 wherein if the flap is closed, the rotational direction is set to the contra-rotating rotational direction.

3. The method as recited in claim 2 wherein if the flap is open, the rotational direction is set as a function of the connecting piece contact.

4. A method for operating an angle grinder, the angle grinder including a cutting wheel and a dust hood equipped with a suction connecting piece, the method including the steps: detecting whether a suction hose is connected to the suction connecting piece or whether a flap of the suction connecting piece is open with the aid of a sensor unit encompassed by the dust hood; and controlling a rotational direction of the cutting wheel of the angle grinder as a function of the state detected by the sensor unit; wherein the sensor unit includes a flap contact to detect whether the flap is open or closed; wherein the rotational direction includes a contra-rotating rotational direction corresponding to a dry cutting with dust extraction and a co-rotating direction corresponding to a dry cutting operation without dust extraction.

5. The method as recited in claim 4 wherein if the flap is open, the rotational direction is set to the contra-rotating rotational direction.

6. The method as recited in claim 5 wherein if the flap is closed, the rotational direction is set to the co-rotating rotational direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the figures, identical and equivalent components are provided with identical reference numerals.

(2) FIG. 1 shows a preferred exemplary embodiment of a dust hood according to the present invention, situated on an angle grinder according to the present invention;

(3) FIG. 2 shows another preferred exemplary embodiment of an angle grinder according to the present invention, including a dust hood;

(4) FIG. 3 shows another exemplary embodiment of an angle grinder according to the present invention, including a dust hood, the dust hood not being connected to the angle grinder; and

(5) FIG. 4 shows a method according to the present invention for operating an angle grinder.

DETAILED DESCRIPTION

(6) FIG. 1 shows a preferred exemplary embodiment of a dust hood 100 according to the present invention, which is situated on an angle grinder 200 according to the present invention. Dust hood 100 includes a hood body 10 for the purpose of covering a circular cutting wheel 220 on both sides, at least in sections. Dust hood 100 is also equipped with a suction connecting piece 40 for connecting a suction hose 400. Removed substrate material UG in the form of dust from a kerf, which is not illustrated here, may be extracted from hood body 10 via suction connecting piece 40 and suction hose 400.

(7) Dust hood 100 includes a sensor unit 20, with the aid of which it is possible to detect whether a flap 45 of suction connecting piece 40 is open.

(8) In the present illustrated exemplary embodiment, sensor unit 20 includes a flap contact 21, with the aid of which it is possible to detect whether flap 45 of suction connecting piece 40 is open or closed. Flap contact 21 is designed as an ON/OFF slide switch, which is situated on suction connecting piece 40 in such a way that the slide switch is actuated into the ON position when flap 45 is opened.

(9) Dust hood 100 includes a signal line 80, via which sensor signal SL originating from sensor unit 20 may be tapped for the purpose of predefining the rotational direction for cutting wheel 220 of angle grinder 200.

(10) Angle grinder 200 itself includes rotational direction control electronics 230, which are connected by signals to sensor unit 20 via an interface (cf. FIG. 3: interface 240) when dust hood 100 is connected. The rotational direction of cutting wheel 220 may be predefined as a function of sensor signal SL coming from sensor unit 20.

(11) In the exemplary embodiment illustrated in FIG. 1, flap 45 of suction connecting piece 40 is closed. Flap contact 21 of sensor unit 20 is connected to rotational direction control electronics 230 via signal line 80. It is provided, as an example, that flap contact 21 in the form of a slide switch is electrically open in the flap state in FIG. 1, and rotational direction control electronics 230 are configured in such a way that cutting wheel 220 is driven in co-rotating rotational direction GLD during the startup of angle grinder 200. This corresponds to a dry cutting operation without dust extraction.

(12) If flap 45 is open, flap contact 21 in the form of a slide switch would be electrically closed, so that rotational direction control electronics 230 now activate angle grinder 200 in such a way that cutting wheel 220 is driven in contra-rotating rotational direction GGD in the case of a startup of angle grinder 200. This would correspond to a dry cutting with dust extraction. It should be noted that dust hood 100 in FIG. 1 is not configured to detect whether suction hose 400 is actually connected to suction connecting piece 40.

(13) However, this is the case in the exemplary embodiment in FIG. 2. Sensor unit 20 includes a flap contact 21, with the aid of which it is possible to detect whether flap 45 of suction connecting piece 40 is open or closed. In addition, sensor unit 20 includes a connecting piece contact 23, with the aid of which it is possible to detect whether suction hose 400 is connected to suction connecting piece 40. Flap contact 21 is provided in the form of a pushbutton to be actuated by opening flap 45. Connecting piece contact 23 is provided in the form of a pushbutton provided within suction connecting piece 40, which, in this case, for example, closes when suction hose 400 is inserted into suction connecting piece 40.

(14) If flap 45 is closed (illustrated here), flap contact 21 in the form of a pushbutton is actuated, i.e. electrically closed. The rotational direction predefinition made by rotational direction control electronics 230 indicates a contra-rotating rotational direction GGD of cutting wheel 220.

(15) If flap 45 is open, and flap contact 21 in the form of the pushbutton is not actuated, i.e. is electrically open, the rotational direction predefinition depends on the switching state of connecting piece contact 23.

(16) If suction hose 400 is inserted into suction connecting piece 40, connecting piece contact 23 in the form of the internal pushbutton is actuated, i.e. electrically closed. The switching state of flap contact 21 and connecting piece contact 23 is transmitted in the form of what is now purely electrical sensor signal SL to rotational direction control electronics 230, which now specifies a contra-rotating rotational direction GGD of cutting wheel 220.

(17) However, if suction hose 400 is not inserted into suction connecting piece 40 while flap 45 is open, correspondingly configured rotational direction control electronics 230 cause a rotation of cutting wheel 220 to be prevented even if the angle grinder is actuated. This is the case since it must be assumed that the dust passing through open flap 45 would harm the user of angle grinder 200.

(18) FIG. 3 is essentially used to explain how sensor unit 20 is to be preferably coupled with rotational direction control electronics 230.

(19) In the exemplary embodiment in FIG. 3, sensor unit 20 includes a flap contact 21, with the aid of which it is possible to detect whether flap 45 of suction connecting piece 40 is open or closed. In addition, the sensor unit includes a hood contact 25, with the aid of which it is possible to detect whether dust hood 100 is connected to angle grinder 200. Flap contact 21 and hood contact 25 may be provided, for example, in the form of pushbuttons as well as in the form of magnetic switches.

(20) As is clearly apparent from FIG. 3, dust hood 100 includes a signal line 80, via which sensor signals SL coming from flap contact 21 and hood contact 25 may be tapped. To now enable a signal to be transmitted to dust hood 100 on angle grinder 200, more specifically to rotational direction control electronics 230, signal line 80 runs through flange 90 of the dust hood up to an electrical interface 240 on the flange. The transmission extension housing includes a corresponding interface 240, from which signal sensor SL reaches rotational direction control electronics 230 of the angle grinder.

(21) Finally, FIG. 4 shows a method for operating an angle grinder, for example an angle grinder of FIGS. 1 through 3. In a first method step S1, a detection takes place with the aid of a sensor unit encompassed by the dust hood as to whether a suction hose is connected to the suction connecting piece and/or whether a flap of the suction connecting piece is open. In a second step S2, a control of the rotational direction of the cutting wheel of the angle grinder takes place as a function of the state detected by the sensor unit.

LIST OF REFERENCE NUMERALS

(22) 10 hood body 20 sensor unit 21 flap contact 23 connecting piece contact 25 hood contact 40 suction connecting piece 45 flap 80 signal line 90 flange 100 dust hood 200 angle grinder 210 transmission extension housing 220 cutting wheel 230 rotational direction control electronics 240 interface 240 corresponding interface 400 suction hose GGD contra-rotating rotational direction GLD co-rotating rotational direction SL sensor signal S1, S2 method steps UG removed substrate material