Abstract
An electric power tool having a rotating tool. The electric tool is characterized in that a direction of rotation of the tool on the electric power tool can be set in dependence on an operating state of the electric power tool. The automatic settability of the direction of rotation of the electric tool is associated with the advantage that no gearbox for changing the direction of rotation, as in an internal combustion engine, is required. In addition, the user-friendliness of the electric power tool for the user can be significantly improved, since the user practically no longer has to worry about setting a “correct” direction of rotation of the tool. In a further aspect, the invention relates to a method for operating an electric power tool having a rotating tool, wherein the direction of rotation of the tool on the electric power tool is set in particular in dependence on whether or not a suction device is connected to the electric power tool.
Claims
1-15. (canceled)
16. An electric power tool comprising: a rotating tool, a direction of rotation of the rotating tool on the electric power tool settable in dependence on an operating state of the electric power tool.
17. The electric power tool as recited in claim 16 further comprising a brushless motor.
18. The electric power tool as recited in claim 16 wherein cooling of the electric power tool is designed to be independent of the direction of rotation.
19. The electric power tool as recited in claim 16 further comprising an indicator for the direction of rotation.
20. The electric power tool as recited in claim 16 wherein the electric power tool is a cut-off grinder, a diamond cut-off grinder or an angle grinder.
21. The electric power tool as recited in claim 16 wherein the operating state indicates whether a suction device is connected to the electric power tool.
22. The electric power tool as recited in claim 16 wherein the electric power tool comprises means for recognizing a suction device.
23. The electric power tool as recited in claim 22 wherein the means for recognizing a suction device includes a microswitch, a magnet or a Hall sensor.
24. The electric power tool as recited in claim 16 further comprising electronics for setting the direction of rotation of the rotating tool of the electric power tool.
25. The electric power tool as recited in claim 16 wherein the rotating tool of the electric power tool rotates clockwise when a suction device is connected to the electric power tool, and the rotating tool of the electric power tool rotates counterclockwise when no suction device is connected to the electric power tool.
26. The electric power tool as recited in claim 16 further comprising a suction hose connection or a suction-extraction device arranged on the electric power tool in dependence on a direction of rotation of the tool of the electric power tool or in dependence on a working direction of the electric power tool.
27. A method for operating an electric power tool having a rotating tool, the method comprising the following method steps: a) providing the electric power tool as recited in claim 16; b) detecting the operating state of the electric power tool with a detector; and c) operating the electric power tool in dependence on the detected operating state of the electric power tool.
28. The method as recited in claim 27 wherein the detector is set up to detect, as the operating state of the electric power tool, whether a suction device is connected to the electric power tool.
29. The method as recited in claim 27 wherein the direction of rotation of the rotating tool of the electric power tool is set in dependence on whether or not a suction device is connected to the electric power tool.
30. The method as recited in claim 27 wherein the direction of rotation of the rotating tool of the electric power tool is indicated by an indicator for the direction of rotation.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0044] Further advantages of the invention will become apparent from the following description of the figures. Various exemplary embodiments of the present invention are illustrated in the figures. The figures, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.
[0045] In the figures, identical and similar components are denoted by the same reference signs. In the figures:
[0046] FIG. 1 shows a view of a preferred embodiment of the electric power tool,
[0047] FIG. 2 shows a view of a further preferred embodiment of the electric power tool,
[0048] FIG. 3 shows a view of a preferred embodiment of a fan wheel for cooling that is independent of the direction of rotation,
[0049] FIG. 4 shows a view of a preferred embodiment of the electric power tool in which the tool rotates counterclockwise,
[0050] FIG. 5 shows a view of a preferred embodiment of the electric power tool in which the tool rotates counterclockwise, in the pulling working direction,
[0051] FIG. 6 shows a view of a preferred embodiment of the electric power tool in which the tool rotates clockwise,
[0052] FIG. 7 shows a view of a preferred embodiment of the electric power tool in which the tool rotates clockwise, in the pushing working direction.
DETAILED DESCRIPTION
[0053] FIG. 1 shows a proposed electric power tool (1) having a motor (2) and a rotating tool (3). In the context of the invention, it is very particularly preferred that the electric power tool (1) is a cut-off grinder, a diamond cut-off grinder or an angle grinder. A direction of rotation (4) of the tool (3) can be set on the electric power tool (1). The motor (3) is a brushless motor. The electric power tool (1), which is depicted in FIG. 1, is a cut-off grinder whose cut-off disk (3) rotates in the clockwise direction. As a result, dust or cuttings arising during the cutting-off or cutting process can be removed from the working region of the tool (3) in such a way as to be moved away or transported away from the user of the electric power tool (1). The electric power tool (1) can comprise a dust hood which preferably surrounds the rotating tool (3) and which is preferably set up to extract by suction the dust or the cuttings, for example in conjunction with a dust suction-extraction device. This advantageously prevents the dust from being inhaled by the user and entering his airways, where it can lead to health impairments.
[0054] In a preferred embodiment of the invention, the electric power tool (1) can comprise a cooling system (see. e.g. FIG. 3). The cooling of the electric power tool (1) is preferably designed to be independent of the direction of rotation. In other words, the cooling of the electric power tool (1) can be designed such that it can be operated independently of the direction of rotation (4) of the tool (3) of the electric power tool (1). The cooling of the electric power tool (1) is preferably set up to protect those components of the electric power tool (1) from undesired overheating that are particularly relevant for the operation of the electric power tool (1), such as for example the motor (2) or the power electronics.
[0055] In a preferred embodiment of the invention, the electric power tool (1) can comprise an indicating means (6) for the direction of rotation (4) (see, e.g., FIG. 4). In other words, it is preferred in the context of the invention that the electric power tool (1) comprises a direction of rotation indicator (6). This direction of rotation or rotary direction indicator (6) can be used to indicate on the electric power tool which direction of rotation (4) of the tool (3) is currently set. The indicating means (6) is preferably situated at a point on the electric power tool (1) that is readily visible to its user.
[0056] FIG. 3 shows a preferred embodiment of a fan wheel for cooling that is substantially independent of the direction of rotation. Cooling ribs can be seen here which preferably lead radially outward from a center point of the fan wheel disk. The fan wheel illustrated in FIG. 3, with preferably radially extending, straight-design cooling ribs, advantageously has no preferential direction when transporting a cooling fluid. As a result, a fan wheel, as illustrated by way of example in FIG. 3, allows cooling to be provided within the electric power tool (1), which can be used for both directions of rotation (4) of the tool (3) of the electric power tool (1).
[0057] FIG. 4 shows an electric power tool (1) whose tool (3) rotates counterclockwise. The preferred working direction of such an electric power tool (1) in which the tool (3) rotates counterclockwise is the “pulling” working direction (9). In the context of the invention, this preferably means that the electric power tool (1)—in FIG. 4 by way of example a cut-off grinder—is pulled in the direction of the user during use. This is intended to prevent what is known as a kickback, that is to say a rapid rebound of the power tool (1) upon sudden jamming in the substrate, which is observed in particular in pushing applications. In the case of electric power tools (1) which, on account of the direction of rotation (4) of their tool (3), are used in particular in the pulling working direction (9), it is particularly preferred that a suction hose connection (7) of a dust hood (8) is arranged in particular at a power tool-side end of the protective hood (8). Such an arrangement of a suction hose connection (7) for a dust hood (8) is illustrated in FIG. 5. In the exemplary embodiment illustrated in FIG. 5 of the electric power tool (1), a suction hose connection (7) for a dust hood (8) is present in particular at the power tool-side end of the protective hood (8). The suction hose connection (7) is preferably present in conjunction with a suction-extraction device (10). This can preferably be an adapter between the dust hood (8) and the suction hose in order to fasten the suction hose of the suction device to the dust or protective hood (8) of the electric power tool (1). It is preferred in the context of the invention that the detection means (5) are arranged in a region of the respective connection pipe for the suction hose. The detection means (5) can, however, be arranged at many different positions on the electric power tool (1).
[0058] FIGS. 6 and 7 show, analogously to FIGS. 4 and 5, electric power tools (1) whose tools (3) rotate in the clockwise direction and which are operated accordingly in the “pushing” working direction (9). In the electric power tool (1) illustrated in FIG. 7, a suction hose connection (7) for a dust hood (8) or a suction-extraction device (10) is therefore situated on a power tool-averted side of the protective hood (8). The suction hose connection (7) thus leads the electric power tool (1) when the electric power tool (1) is operated in the “pushing” working direction (9).
LIST OF REFERENCE SIGNS
[0059] 1 Electric power tool, for example a cut-off grinder [0060] 2 Motor [0061] 3 Tool [0062] 4 Direction of rotation [0063] 5 Detection means [0064] 6 Indicating means for the direction of rotation of the tool [0065] 7 Suction hose connection [0066] 8 Dust or protective hood [0067] 9 Working direction of the electric power tool [0068] 10 Suction-extraction device
