Abstract
A profile structure for a component of a power tool, wherein the profile structure has a front side and a rear side, and wherein the profile structure has at least two corrugations on one of the two sides and at least one corrugation on the other side. A power tool having a component that includes a profile structure. The power tool may preferably be a cutting or severing device, wherein the power tool component may be a cutting arm. The profile structure is particularly suitable for withstanding different loadings to which a component of a power tool may be exposed. The loadings may be for example bending about a horizontal or about a vertical axis or torsion. In a further aspect, the invention relates to a cutting arm for a power tool, wherein the cutting arm comprises a profile structure. The cutting arm may in particular be formed in one piece.
Claims
1-15. (canceled)
16: A profile structure for a component of a power tool, the profile structure comprising: a front side and a rear side, at least two corrugations on one of the front and rear sides and at least one corrugation on the other of the front and rear sides.
17: The profile structure as recited in claim 16 wherein the corrugations extend in the longitudinal direction of the component.
18: The profile structure as recited in claim 16 wherein the corrugations are arranged substantially symmetrically about a virtual central axis of the component of the power tool.
19: The profile structure as recited in claim 16 wherein the courrugations number n corrugations on the front side V and (n1) corrugations on the rear side.
20: The profile structure as recited in claim 16 further comprising reinforcement ribs.
21: The profile structure as recited in claim 20 wherein the reinforcement ribs are arranged in the corrugations.
22: The profile structure as recited in claim 16 wherein the reinforcement ribs enclose an angle alpha with a virtual central axis, wherein the angle alpha lies in a range from 30 to 60.
23: The profile structure as recited in claim 16 further comprising has solid faces on the front side.
24: The profile structure as recited in claim 16 wherein the profile structure is manufactured from more than one material, wherein a basic structure of the profile structure includes a metal or reinforcement ribs include a plastic.
25: A power tool comprising a component including the profile structure as recited in claim 16.
26: The power tool as recited in claim 25 comprising a corrugation region arranged between a transmission cylinder and a tool cylinder of the component.
27: The power tool as recited in claim 25 wherein the component is a cutting arm for a power tool.
28: The power tool as recited in claim 25 wherein the power tool is a cutting or severing device or a saw.
29: A cutting arm for a power tool, the cutting arm comprising the profile structure as recited in claim 16.
30: The cutting arm as recited in claim 29 wherein the cutting arm is formed in one piece.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0039] Further advantages will become apparent from the following description of 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.
[0040] Identical and similar components are denoted by the same reference signs in the figures, in which:
[0041] FIG. 1 shows an illustration of a vertical section through a component of a power tool, wherein the vertical section reveals a preferred configuration of the profile structure
[0042] FIG. 2 shows an illustration of a vertical section through a component of a power tool, wherein the vertical section reveals a second preferred configuration of the profile structure
[0043] FIG. 3 shows an illustration of a vertical section through a component of a power tool, wherein the vertical section reveals a [[second]] third preferred configuration of the profile structure
[0044] FIG. 4 shows a side view of a preferred embodiment of the cutting arm, wherein the cutting arm implements torsion about a central axis
[0045] FIG. 5 shows a side view of a preferred embodiment of the cutting arm, wherein the cutting arm implements bending about a vertical axis
[0046] FIG. 6 shows a side view of a preferred embodiment of the cutting arm, wherein the cutting arm implements bending about a horizontal axis
[0047] FIG. 7 shows a side view of a preferred embodiment of the cutting arm to illustrate the corrugation region
[0048] FIG. 8 shows a side view of a preferred embodiment of the cutting arm to illustrate a profile structure with five corrugations
[0049] FIG. 9 shows a side view of a preferred embodiment of the cutting arm to illustrate a profile structure with five corrugations
DETAILED DESCRIPTION
[0050] The figures show preferred embodiments of the profile structure 1. In particular, the figures illustrate vertical sections through a component 20 of a power tool 10 (see, e.g, FIG. 4 with cutting arm 50 as the component), wherein the profile structure 1 of the component 20 of the power tool 10 is revealed by this illustration of the vertical section. The profile structure 1 has at least two corrugations 2, wherein, for example, the profile structure 1 illustrated in FIG. 1 has five corrugations 2. In the exemplary embodiment of the present invention that illustrated in FIG. 1, the corrugations 2 are formed by channel-like recesses, which are preferably formed one above another and with substantially parallel side walls. The exemplary embodiment of the invention that is illustrated in FIG. 1 has, for example, three corrugations 2 that are open in the direction of the left-hand half of the image and two corrugations 2 that are open in the direction of the right-hand half of the image. The cutting arm illustrated in FIG. 1 thus has a total of five corrugations 2. The profile structure 1 has profile structure walls 4, which may have different thicknesses. In particular, the profile structure walls 4 can be thicker at the transition regions between a corrugation and a profile face of the profile structure 1 than in the region of the side walls of the corrugations 2. The outwardly facing surfaces of the component 20 of the power tool 10 are preferably referred to as a profile faces according to the invention. The exemplary embodiment of the invention that is illustrated in FIG. 1 represents substantially a basic structure 5 of the profile structure 1, wherein the profile structure 1 illustrated in FIG. 1 has, for example, no reinforcement ribs 3 (see also, FIG. 4). In the exemplary embodiment of the invention that is illustrated in FIG. 1, the corrugations 2 are open on the left-hand side and closed on the right-hand side of the figure.
[0051] FIG. 2 illustrates an alternative or second configuration of the profile structure 1. The exemplary embodiment of the invention that is illustrated in FIG. 2 has a total of three corrugations 2, wherein two corrugations 2 are open in the direction of the left-hand half of the image and one corrugation 2 is open in the direction of the right-hand half of the image. The corrugations 2 and their dimensions are illustrated in the figures by way of braces.
[0052] Furthermore, the embodiment of the invention that is illustrated in FIG. 2 comprises reinforcement ribs 3, which are arranged preferably in the corrugations 2. The reinforcement ribs 3 give the profile structure 1 even greater stability and robustness. In the exemplary embodiment of the invention that is illustrated in FIG. 2, four reinforcement ribs 3 can be seen, for example. The remaining structure, which does not form a reinforcement rib 3, is the basic structure 5 of the profile structure 1.
[0053] FIG. 3 illustrates an alternative or third configuration of the profile structure 1. The profile structure 1 illustrated in FIG. 3 has two corrugations 2 and a series of reinforcement ribs 3. The exemplary embodiment of the invention that is illustrated in FIG. 3 likewise has a total of three corrugations 2, wherein two corrugations 2 are open in the direction of the left-hand half of the image and one corrugation 2 is open in the direction of the right-hand half of the image. Present in the corrugations 2 are a series of reinforcement ribs 3, which give the profile structure 1 even greater stability.
[0054] FIGS. 4-6 show side views of preferred embodiments of the cutting arm 50. In this case, FIG. 4 shows how the cutting arm 50 implements torsion about a central axis D of the cutting arm 50, while FIGS. 5 and 6 illustrate bending about a vertical (FIG. 5) and a horizontal (FIG. 6) axis of the cutting arm 50, respectively. The central axis, and the vertical and the horizontal axis of the cutting arm 50 are illustrated by dashed lines in FIGS. 4 to 6, which extend through the cutting arm 50 or lie within the cutting arm 50. The directions of bending or rotation of the cutting arm 50 under the respective loading types are indicated in FIGS. 4 to 6 by the round arrows at the ends of the axes.
[0055] FIG. 4 furthermore shows the three axes A, B and C, which may extend through different points of the cutting arm 50. The first axis A represents the motor axis of the power tool 10. The second axis B represents the transmission axis of the power tool 10 and is connected to one of the two pulleys of the belt drive of the power tool 10. The third axis C represents the tool axis of the power tool 10 and is connected to the other of the two pulleys of the belt drive of the power tool 10. The tool 11 of the power tool 10 can rotate about the third or tool axis C of the cutting arm 50. The tool 11 may be for example a disk-like tool such as a cut-off or cutting disk, wherein the tool 11 is designed to rotate about the tool axis C. Furthermore, FIG. 4 depicts the angle alpha, which is preferably enclosed by the reinforcement ribs 3 and the corrugations 2 or the reinforcement ribs 3 and the torsion axis of the cutting arm 50. The torsion axis of the cutting arm 50 coincides in particular with the virtual central axis D of the cutting arm 50.
[0056] In FIG. 5, solid faces 6 are illustrated, which are arranged in particular on the front side V of the profile structure 1 or of the cutting arm 50. These solid faces 6 are preferably arranged substantially in a symmetrically distributed manner about the virtual central axis D of the cutting arm 50. The solid faces 6 advantageously prevent deflection of the cutting arm 50 and thus result in reduced tensile stress within the component 20 or the cutting arm 50. As a result, the component 20 or the cutting arm 50 of the power tool 10 is protected particularly effectively against damage caused by excessive tensile stresses.
[0057] FIG. 7 shows a side view of a preferred embodiment of the cutting arm 50, wherein in particular the corrugation region SB of the cutting arm 50 of the power tool 10 is depicted. The cutting arm 50 can have a transmission cylinder 7 and a tool cylinder 8, wherein the corrugation region SB extends preferably between the transmission cylinder 7 and the tool cylinder 8. Preferably, the second axis B (see, e.g., FIG. 4) of the cutting arm 50, i.e. the transmission axis B, extends through the transmission cylinder 7, while the third axis C (see, e.g., FIG. 4) of the cutting arm 50, i.e. the tool axis C, extends through the tool cylinder 8. The transmission cylinder 7 and the tool cylinder 8 can each have an outside diameter on the rear side R of the cutting arm 50, wherein the corrugation region SB of the profile structure 1 extends in particular in a region with the smallest spacing between transmission cylinder 7 and the tool cylinder 8. This smallest spacing is preferably arranged between the outside diameters of the transmission cylinder 7 and of the tool cylinder 8. The components of the transmission cylinder 7 and of the tool cylinder 8 on the rear side R of the cutting arm 50 are referred to, according to the invention, preferably as the device 7a for connecting a transmission cylinder 7 to a transmission of a power tool 10 and as the device 8a for connecting a tool cylinder 8 to a tool 11 of the power tool 10. Reference arrows for the transmission cylinder 7 and the tool cylinder 8 are illustrated in particular in FIGS. 5 to 7, wherein the arrows each point in particular to the outside diameters of the transmission cylinder 7 and of the tool cylinder 8. Starting from these outside diameters, dashed lines are drawn, between which the corrugation region SB of the profile structure 1 or of the component 20 extends.
[0058] FIG. 8 shows a side view of a preferred embodiment of the cutting arm 50, wherein in particular a profile structure 1 with five corrugations 2 is depicted. To clarify the corrugations 2, bars are shown in FIG. 8, which are intended to mark the side walls of the corrugations 2. As is apparent from the exemplary embodiment of the invention that is shown in FIG. 8, the openings of the corrugations 2 can be oriented both in the direction of the front side V and in the direction of the rear side R of the profile structure 1 or of the cutting arm 50. This means that the corrugations 2 are arranged both on the front side V and on the rear side R of the profile structure 1 or of the cutting arm 50. Preferably, the corrugations 2 have their openings alternately in the direction of the front side V and in the direction of the rear side R of the profile structure 1 or of the cutting arm 50. In the examples illustrated in the figures, usually three corrugations 2 are arranged or oriented such that their openings are oriented in the direction of the front side V of the profile structure 1 or of the cutting arm 50. These corrugations 2 are, according to the invention, referred to as corrugations 2 that are arranged on the front side V of the profile structure 1 or of the cutting arm 50, while the corrugations 2 that are arranged on the rear side R of the profile structure 1 or of the cutting arm 50 are open in the direction of the rear side R of the profile structure 1 or of the cutting arm 50. In the context of the present invention, the corrugations 2 are arranged both on the front side V and on the rear side R of the profile structure 1 or of the cutting arm 50, such that a two- or double-sided arrangement of corrugations 2 on a component 20, such as a cutting arm 50 for a power tool 10, is obtained.
[0059] The opening direction of the corrugations 2 is illustrated in particular in FIG. 9. The three corrugations 2 that are open toward the front side V of the profile structure 1 or of the cutting arm 50 are marked by a white arrow in FIG. 9, while the two corrugations 2 that are open toward the rear side R of the profile structure 1 or of the cutting arm 50 are marked by a black arrow in FIG. 9. The three corrugations 2 marked by a white arrow are thus corrugations 2 that are arranged on the front side V of the profile structure 1 or of the cutting arm 50, while the two corrugations 2 marked with a black arrow are those corrugations 2 that are arranged on the rear side R of the profile structure 1 or of the cutting arm 50.
LIST OF REFERENCE SIGNS
[0060] 1 Profile structure [0061] 2 Corrugation [0062] 3 Reinforcement rib [0063] 4 Profile structure wall [0064] 5 Basic structure [0065] 6 Solid faces [0066] 7 Transmission cylinder [0067] 8 Tool cylinder [0068] 10 Power tool [0069] 11 Tool [0070] 20 Component [0071] 50 Cutting arm [0072] A First axis, motor axis [0073] B Second axis, transmission axis [0074] C Third axis, tool axis [0075] D Virtual central axis of the cutting arm [0076] S Corrugation region [0077] V Front side [0078] R Rear side [0079] alpha Angle between reinforcement ribs and corrugations or virtual central axis
