Power tool parts comprising a marker, a kit of parts comprising at least one power tool part and at least one marker and methods for assembling a power tool or servicing a chain saw

Abstract

A power tool part (110, 140, 150) for a chain saw (100) associated with a saw chain type, the power tool part (110, 140, 150) comprising a marker (160) with a background part (510) and one or more text portions (520, 530) that at least partly overlap the background part (510), the background part (510) comprising a pattern and / or a color selected from a discrete set of patterns and / or colors, where each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool associated with the power tool part, where the at least one text portion (520, 530) indicates a dimension of the power tool part. The invention further comprises a kit of parts comprising at least one power tool part and at least one marker, a method for assembling a power tool from an assortment of power tool parts, a method for servicing a chain saw comprising a power tool part and a power tool part for a brush cutter or clearing saw comprising such a marker.

Description

[0001] TITLE

[0002] A MARKER SYSTEM FOR CHAIN SAW ASSEMBLY AND MAINTAINANCE

[0003] TECHNICAL FIELD

[0004] The present disclosure relates to handheld power tools and in particular to a marker system for identifying mutually compatible chain saw parts and maintenance tools. The marker systems disclosed herein are configured to assist a user in performing the technical task of assembling and servicing a chain saw in an efficient manner.

[0005] BACKGROUND

[0006] A handheld chain saw comprises a main body that supports a drive motor and a guide bar. A saw chain is supported on the guide bar and driven by the drive motor via a sprocket.

[0007] Chain saws are normally adapted for cutting wood. However, saw chains for cutting hard materials such as concrete and stone are also known. In the latter case the cutter elements on the saw chain are replaced by abrasive elements such as carbide or diamond abrasive elements.

[0008] There is a large variety of different chain saws, guide bars, saw chains and saw chain sharpening tools on the market. Selecting tool parts and assembling a fully functional chain saw may be challenging.

[0009] Saw chain maintenance may comprise use of a saw chain sharpening tool, such as a saw chain sharpening file, to sharpen the cutter elements of the saw chain. It is important that the dimensions of the file matches those of the saw chain. Selecting the correct sharpening file is not always straight forward.

[0010] SUMMARY

[0011] It is an objective of the present disclosure to provide improved assembly techniques and power tool parts for assembly and maintenance of chain saws and other power tools such as brush cutters. This objective is at least in part obtained by a power tool part for a chain saw that is associated with a particular saw chain type, i.e., a saw chain having certain specifications in terms of, e.g., length, gauge, and pitch. Thepower tool part may for instance be a power tool body, a guide bar, or a saw chain for a chain saw. The power tool part comprises a marker with a background part and one or more text portions that at least partly overlap the background part. The background part comprises a pattern and / or a color selected from a discrete set of patterns and / or colors, where each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of chain saw sharpening tool, such as a sharpening file with a sharpening file guide. The at least one text portion indicates a dimension of the power tool part, such as a dimension of a saw chain type. A first text portion out of the one or more text portions may for instance be configured to indicate chain pitch and / or chain gauge, while a second text portion out of the one or more text portions can be configured to indicate chain length, e.g., in terms of the number of drive links of the compatible saw chain or the length of the chain in centimeters or inches.

[0012] The marker arranged on the power tool part is, due to its technical features, resistant to wear. This is an advantage since a user can determine which sharpening tool to use even if the power tool part is worn, such as if the marker has been scratched or smudged during use of the power tool. The fact that the background part comprises a pattern and / or a color selected from a discrete set of patterns and / or colors makes it easier for the user to determine which pattern and / or color out of the discrete set that a given worn or smudged background part originally had, since the user can compare the a-priori limited set of possibilities to the worn background part.

[0013] The combination of technical features of the marker also reduces the risk of using the wrong type of sharpening tool with a given saw chain. Some users tend to try different sharpening tools with a saw chain in order to find the correct dimension sharpening tool, similar to trying different keys in a lock until one that fits is found. However, this sharpening tool selection process comes with the risk of finding an almost correct sharpening tool. Using an almost correct sharpening tool is hard to notice and may significantly degrade the performance of the saw chain. The power tool parts described herein reduce this risk.

[0014] There is also a risk that a user will select an almost correct saw chain or other power tool part for use with another power tool part. This selection may yield a functional assembly, but the assembly will have degraded performance and there is a risk of causing permanent damage to the power tool parts. The markers described herein alleviates this risk.The use of a background part with at least partly overlapping text portions is easy to see from a distance, especially if the background part is a colored surface. This technical feature allows a user to more quickly find the correct power tool part for assembly with one or more other power tool parts and thus obtain a complete power tool more quickly and with less risk of assembling incompatible power tool parts. Suitable colors for use for the background part of the marker comprise, e.g., blue, yellow, orange, black, green, and red. Suitable patterns may comprise patterns such as checkerboard, striped, dotted, and so on. Colors and patterns may be combined, although a relatively clean uncomplex background part is preferred.

[0015] The discrete set of patterns and / or colors may also comprise an empty frame background, where each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool, except for the empty frame background which indicates that the power tool part is agnostic to type of sharpening tool. This allows the marker to be used also on parts that are agnostic to type of sharpening tool, i.e., where there are no compatibility requirements on the choice of sharpening tool. A marker with an empty frame background can for instance be arranged on a guide bar which is agnostic to the type of sharpening tool used.

[0016] The information encoded in the markers disclosed herein is arranged in three layers. The background part will be visible from a larger distance compared to the text portions. A plurality of markers will appear as a coherent section of power tool parts on, e.g., a store shelf or a tool board. The text portions are visible from a smaller distance. The user wanting to find the correct power tool part for assembly with one or more other power tool parts sees the background parts first and then move towards the correct part of the shelf or tool board to read the text portions, thereby locating the correct power tool part more efficiently. The text portion may be divided into a first text portion and a second text portion with different font or font size, thus providing a second layering of the marker.

[0017] According to some aspects, the one or more text portions are laser printed onto a surface of the power tool part. A laser printed text portion exhibits the technical feature of being resistant to wear, which is an advantage when used on power tool parts of the kind discussed herein. Laser print can also be used on top of different backgrounds, such as on top of painted background surfaces or on top of background surfaces deposited by a physical vapor deposition (PVD) process.According to some further aspects, the background part and the one or more text portions are printed onto a first surface of a sticker. The sticker comprises an adhesive layer on a second surface opposite to the first surface. The sticker can be retrofitted onto legacy power tool parts, i.e., onto already existing power tool parts that lack the new markers described herein, which is an advantage. The sticker can also be applied with advantage on store shelves and on tool boards.

[0018] According to an example, the power tool part is a chain saw main body and the marker is arranged on an inside of a rear handle aperture formed in the main body of the power tool. The marker is protected at this location and therefore becomes more resistant to wear. The marker is also clearly visible from many viewing angles at this location, which is an advantage.

[0019] According to another example, the power tool part is a guide bar and the marker is arranged on a proximal section of the guide bar, i.e., on a part of the guide bar close to the main body of the chain saw in use. This is also a relatively protected location which is also visible to a user of the chain saw from most viewing angles.

[0020] According to yet another example, the power tool part is a saw chain and the marker is arranged on a tie strap of the saw chain. The tie strap is preferably also used as a start marker for the sharpening process, i.e., the point on the chain where sharpening starts and stops. One tie-strap on the saw chain can be colored in a different color compared to the rest of the tie straps on the chain to indicate a start of saw chain sharpening. The tie strap can, for instance, be treated by a PVD process in order to color it. Laser printed text portions on the tie strap can be used to indicate the chain characteristics to a user. The marker may also be arranged on any of the other saw chain elements, such as on one or more of the drive links, on one or more of the cutter elements, or even on one or more of the rivets of the saw chain.

[0021] There are also disclosed assembly methods, production methods, and legacy product marking methods associated with at least some of the advantages mentioned above. Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / an / the element, apparatus, component, means, step, etc." are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed,unless explicitly stated. Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following description. The skilled person realizes that different features of the present invention may be combined to create embodiments other than those described in the following, without departing from the scope of the present invention.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present disclosure will now be described in more detail with reference to the appended drawings, where:

[0024] Figure 1 illustrates an example handheld power tool;

[0025] Figure 2 schematically shows a guide bar for a chain saw;

[0026] Figures 3A-E show parts of a saw chain;

[0027] Figures 4A-B show example markers with text portions;

[0028] Figures 5A-B are schematic illustrations of markers with text portions; and Figures 6A-B are flow charts illustrating methods.

[0029] DETAILED DESCRIPTION

[0030] Aspects of the present disclosure will now be described more fully with reference to the accompanying drawings. The different devices and methods disclosed herein can, however, be realized in many different forms and should not be construed as being limited to the aspects set forth herein. Like numbers in the drawings refer to like elements throughout.

[0031] The terminology used herein is for describing aspects of the disclosure only and is not intended to limit the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0032] Figure 1 illustrates an example handheld power tool 100 in the form of a chain saw for sawing wood and other materials. The different marking systems, power tool parts, and methods discussed herein will mainly be exemplified by chain saws for sawing wood. However, the disclosure also applies to other types of chain saws, such aschain saws for cutting concrete, stone, and other hard materials by abrasive saw chains. The disclosure also applies to brush cutters and clearing saws which can be sharpened by dedicated sharpening files.

[0033] The power tool 100 discussed herein comprises a main body 110 with a front handle 120 and a rear handle 130. Top handle chain saws are also known, in which case the rear handle 130 has been moved closer to the front handle 120 on the upper side of the main body 110. The rear handle 130 is often formed as part of an aperture 135 in the main body 110. The actual rear handle 130 then constitutes the upper part of the aperture wall, which then extends in a curve back to the main body, as shown on the example chain saw in Figure 1. This type of rear handle forms an inner wall that extends around the aperture, which is somewhat protected from the ambient environment.

[0034] The main body 110 may be divided into two or more parts which are vibrationally isolated from each other by resilient members such as steel springs or rubber bushings.

[0035] The main body 110 supports a drive motor which may be an electric machine or an internal combustion engine, such as a two-stroke crankcase scavenged combustion engine or a two-stroke combustion engine with fuel injection. The drive motor is operably connected to a sprocket which drives the saw chain 150 of the power tool 100.

[0036] A guide bar 140 arranged to support the saw chain extends out from the main body 110. The dimensions of the guide bar determine the length of the saw chain which can be assembled on the guide bar and also the pitch and gauge of the saw chain. Saw chain length is often given in terms of the number of drive links of the saw chain, or by a measure such as a length value given in centimeters or in inches. The guide bar 140 is often replaceable, i.e., releasably attached to the main body 110, which means that different guide bars 140 can be assembled on a given main body 110. Figure 2 illustrates an example guide bar 140. The guide bar extends in an elongation direction 200. A midpoint 210 of the guide bar 140 extends orthogonally with respect to the elongation direction 200 and divides the guide bar into to equal length halves, measured in the elongation direction 200. The guide bar 140 comprises attachment means 220 adapted to interface with the main body 110 of the power tool 100 in order to fix the guide bar onto the main body. The attachment means often comprise a slotas shown in the example, and possibly also one or more bolt holes 225. The main body housing often extends out over the attachment means 220 such that the attachment between the main body 110 and the guide bar 140 is not visible from outside of the power tool 100.

[0037] A proximal section 230 of the guide bar can be defined as the part of the guide bar that extends from the midpoint 210 to the attachment means 220. Conversely, a distal section 240 of the guide bar 140 can be defined as the part of the guide bar that extends from the midpoint 210 to the distal end point 250 of the guide bar 140. The proximal section 230 of the guide bar 140 is normally visible from outside the chain saw housing.

[0038] Figures 3A-E illustrate parts of an example saw chain 150. A saw chain is generally characterized by its length and by the dimensions of its constituent parts. A saw chain for cutting wood is made up of drive links 310 that transfer power from the drive motor sprocket to the saw chain 150 and cutter elements 300 which are the parts of the chain that cut through the wood or other material to be sawed. Rivets 320 and tie straps 330 hold the chain elements together to form an endless saw chain.

[0039] Different cutter element types are known, such as chipper, semi-chisel, chamferchisel, micro-chisel, and full chisel elements. Full chisel saw chains have sharp cutter corners that efficiently split wood fibers. They often provide the fastest and most efficient cutting experience in clean softwood. Semi-chisel saw chains have slightly rounded cutter corners. This design enables the cutter to retain sharpness for longer time periods, particularly when cutting hard or frozen wood or working in dirty surroundings. In such conditions, a full chisel saw chain more quickly loses its sharpness. Chipper saw chains share similarities with semi-chisel chains but have an even rounder working corner.

[0040] The length of a saw chain is normally determined by the total number of drive links 310 (DL) on the saw chain. A saw chain may, e.g., be a 56DL, 64DL, ora 72DL length saw chain. The gauge of a saw chain refers to the thickness of the drive link parts which fit into the guide bar groove. Chain pitch refers to the size of the chain and is normally determined by the distance between three consecutive rivets of the saw chain divided by two.

[0041] Due to the variety of different drive sprockets, different guide bars, and different saw chains, it is sometimes a challenge for an operator to perform the technical task ofassembling a complete chain saw, i.e. , to select a saw chain 150 and a guide bar 140 which are compatible with each other and at the same time compatible with a given chain saw main body 110.

[0042] Most saw chains require periodic maintenance, which includes sharpening of the cutter elements 300. A dedicated saw chain tool is normally used to sharpen the cutter elements of the saw chain. The user starts to file the cutter elements at a given point on the saw chain and then works his or her way around the saw chain. It is important that the dimensions of the saw chain sharpening tool matches the dimensions of the saw chain, otherwise the end result will not be satisfactory. A sharpening file gauge, sometimes also referred to as a sharpening file guide, file holder, or file jig, can be used to correctly align the tool with the saw chain during sharpening and to obtain the correct filing depth. The file gauge is selected depending on the dimensions of the saw chain which is to be sharpened.

[0043] A brush cutter or clearing saw is a power tool that comprises a saw blade with teeth that may require periodic maintenance. The dimensions of the saw blade determine which sharpening tool to use. Commonly used sharpening tools comprise sharpening tools of different dimensions and different geometries. The center hole of the saw blade for a brush cutter differs between saw blades and also the blade diameter. Hence, there is a need for a marker system that allows efficient assembly and maintenance of brush cutters and clearing saw. The background part of a marker for a brush cutter power tool may be indicative of the correct sharpening tool, while one or more text portions may indicate blade center hole and / or blade diameter.

[0044] In order to enable a user of a power tool to assemble compatible power tool parts correctly and efficiently, and also select the correct type of sharpening tool for a given tool, a special type of marker system has been developed. The marker system comprises a marker 160 which is exemplified in Figure 1 , Figure 2, and in Figures 3A-E.

[0045] Figure 4A show some example markers with two text portions. The upper text portion, which can be referred to as a first text portion, indicates the saw chain pitch and the saw chain gauge by a number, such as 83, 35, 33, 93, 21 and 11 , where the first digit indicates the pitch, and the second digit indicates the gauge. The letter “P” here stands for pixel, which denotes a specific saw chain type. Another letter in the upper text portion may indicate the cutter type, such as “S” for semi-chisel. The first digit ofthe upper text portion indicates the pitch of the chain. For instance, the first digit may be interpreted according to:

[0046] 1 = 1 / 4” mini

[0047] 2 = .325” mini

[0048] 3 = .325”

[0049] 8 = 3 / 8”

[0050] 9 = 3 / 8” mini

[0051] The pitch of the chain must match the pitch of the guide bar and the drive sprocket on the chain saw. Mini chains (indicated by the addition “mini” above) have low profile cutters, smaller drive links and are suitable for smaller chain saws.

[0052] The second digit tells of the gauge, meaning the thickness of the lower part of the drive link. The gauge of the chain must match the gauge of the guide bar. The second digit may be mapped onto gauge according to the below:

[0053] 1 = 1,1 mm / .O43”

[0054] 3 = 1,3 mm / .050”

[0055] 5 = 1,5 mm / .O58”

[0056] A third digit can be used to indicate additional features of the saw chain. A “G” for instance may indicate that at least some of the drive links on the chain are guarded drive links, which is a kick-back reducing feature.

[0057] The lower text portion, which can be referred to as a second text portion, can be used to indicate the number of drive links of the saw chain, i.e., a measure of the length of the saw chain.

[0058] In case the marker is used together with a brush cutter, then the background part may indicate the correct sharpening tool to use, while the text portion or portions indicate center hole diameter and saw blade diameter, as noted above. The thickness of the brush cutter saw blade may also be indicated by a text portion on the marker.

[0059] Figure 4B shows some example markers with a single text portion. The marker on the left in Figure 4B indicates a pixel saw chain (“P”) with a pitch of .325” and a gauge of .058”. The marker on the right in Figure 4B indicates a saw chain having a length corresponding to 56 drive links.With reference also to Figures 5A-B, the marker 160 comprises a background part 510 and one or more text portions 520, 530 that at least partly overlap the background part 510. The background part 510 comprises a pattern and / or a color that has been selected from a discrete set of patterns and / or colors. In other words, there is a limited number of backgrounds, such as a predetermined set of colors or patterns. The discrete set of colors may for instance comprise blue, yellow, orange, black, green, and red. The discrete set of patterns may comprise a striped pattern, a checkerboard pattern, and so on.

[0060] Each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool. This means that a user can inspect the background part 510 of a given marker 160 and thus discover what sharpening tool to use. The user does not have to be able to read any of the text portions on the marker in order to understand what sharpening tool to use, which is an advantage since it makes the maintenance process more resilient to wear of the different power tool parts on a power tool such as a chain saw. Thus, the user is assisted in performing the technical task of maintaining the saw chain. A technical advantage of encoding information related to sharpening tool type in the background part 510 is that the background part is resistant to scratches and general wear incurred during use of the chain saw. The correct sharpening tool type could of course also be indicated by text, but text is easily scratched and damaged, which may render the text unreadable.

[0061] In most cases the background part also indicates an approximate saw chain pitch and gauge. The background part is indicative of the correct sharpening tool to use, and therefore also indicates the group of saw chains that are associated with the sharpening tool.

[0062] The at least one text portion 520, 530 indicates a dimension of the saw chain type, such as the gauge and / or the pitch of the saw chain, as discussed above. By embedding information indicative of saw chain pitch and / or saw chain gauge in a text portion 520, 530 that at least partly overlaps the background part 510, the text portion is easy to find, which enables a user to assemble a complete power tool in a more efficient manner. Figure 5A shows an example marker 160 with a first text portion 520 and a second text portion 530. In this case both the first and the second text portion are comprised within the boundary of the background part 510. However, some parts of the text portions 520, 530 may also extend outside of the background part boundary 500. Figure 5B shows an example marker 160 with a single text portion 520.The first text portion 520 out of the one or more text portions 520, 530 can be configured to indicate chain pitch and / or chain gauge.

[0063] The second text portion 520 out of the one or more text portions 520, 530 can be configured to indicate chain length, for instance by indicating the number of drive links in a saw chain.

[0064] The discrete set of patterns and / or colors optionally also comprises an empty frame background. In this case each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool, such as a sharpening file and a sharpening file guide, except for the empty frame background which indicates that the power tool part is agnostic to type of sharpening tool. This type of marker may, e.g., be suitable for a guide bar 140 which can support saw chains of two or more different pitches.

[0065] The marker 160 may be applied to the power tool part using different methods. For instance, the one or more text portions 520, 530 can be laser printed onto the power tool part. A laser printed text portion is resilient to wear which often occurs on power tool parts of a chain saw. Various types of laser technology can be used for creating the marker 160. Examples include annealing marking, engraving and removing. During annealing the heat output leads to local change in the structure of metal, resulting in recoloring of the metal and the surface remains undamaged and clean. Engraving involves a vaporization of the material. Inscriptions generated by laser printing generally have a long life and are abrasion resistant. Laser printing may sometimes also be referred to as laser etching.

[0066] The background part 510 can be deposited onto a surface of the power tool part by physical vapor deposition (PVD). PVD, sometimes called physical vapor transport (PVT), describes a variety of vacuum deposition methods which can be used to produce thin films and coatings on substrates including metals, ceramics, glass, and polymers. PVD is characterized by a process in which the material transitions from a condensed phase to a vapor phase and then back to a thin film condensed phase. The most common PVD processes are sputtering and evaporation.

[0067] Alternatively, the background part 510 can be deposited onto the surface of the power tool part by deposition of paint, such as by use of a tampon stamp or the like. Laser printing onto a PVD or stamped surface has been found to yield good results in terms of both wear resistance and visibility.Chemical coloring of metals can also be used to create the background part. Chemical coloring is the process of changing the color of metal surfaces with different chemical solutions. Chemical coloring of metals may comprise electroplating which is the coating of a metal surface with another metal using electrolysis, patination which refers to chemically reacting the metal surface to form a colored oxide or salt, anodization which is an electrolytic passivation process that increases the thickness of the natural oxide layer to produce a porous surface which can accept organic or inorganic dyes easily. In the case of titanium, niobium, and stainless steel, the color formed is dependent on the thickness of the oxide which is determined by the anodizing voltage.

[0068] Chemical coloring of a metal surface is distinct from simply coating it using a method such as gilding or mercury silvering, because chemical coloring involves a chemical reaction, whereas simple coating does not.

[0069] According to an example, the power tool part 110 is a chain saw main body 110, and the marker 160 is arranged on an inside of a rear handle aperture 135 formed in the main body. An example marker of this kind is shown in Figure 1, underneath the rear handle 130, on the front or bottom portion of the inner wall of the rear handle aperture 135. A marker may also be placed on the side of the main body housing, e.g., in connection to the motor air intake as shown in Figure 1.

[0070] According to another example, the power tool part 140 is a guide bar 140, and the marker 160 is arranged on a proximal section 230 of the guide bar, as shown in the example in Figure 2. This part of the guide bar is distanced from the work object to be cut but not covered by the housing when the guard bar is assembled onto the main body 110 of the power tool 100. Thus, this is an advantageous location for the markers described herein. According to an example, the marker is stamped, etched or engraved into the material of the guide bar 140. Laser printing onto the surface of the guide bar 140 may, however, be a preferred method of applying the marker 160. According to yet another example, the power tool part 150 is a saw chain, and the marker 160 is arranged on a tie strap 330 of the saw chain, as shown in the examples of Figures 3A-B. Figure 3A shows a tie strap that has been colored in its entirety to form the background part of the marker. It is also possible to color just a part of the tie strap to form the background part of the marker 160. Figure 3B shows a saw chain with a tie strap that has not been colored outside of the marker boundary 500. Figures 3C-E show some alternative or complementary locations for the marker 160. One ormore markers 160 may be arranged on a saw chain 150. Possible locations of the one or more markers 160 on a saw chain comprise on one or more of the drive links 310 (Figure 3C), on one or more of the cutter elements 300 (Figure 3D), and / or on one or more of the rivets 320 (Figure 3E).

[0071] Figure 6A is a flow chart that illustrates a method for assembling a power tool 100 from an assortment of power tool parts 110, 140, 150. The method comprises selecting Sa1 a main body 110 having a first marker 160,

[0072] selecting Sa2 a guide bar 140 having a second marker 160 which is compatible with the marker of the main body 110, and

[0073] selecting Sa3 a saw chain 150 having a third marker 160 which is compatible with the second marker 160.

[0074] Figure 6B is a flow chart that illustrates a method for servicing a power tool part which is a saw chain 150. The method comprises

[0075] inspecting Sb1 the marker 160 arranged on the power tool part 150,

[0076] selecting Sb2 a sharpening tool for sharpening a cutter element 300 of the power tool part 150 by matching the sharpening tool with the tool type indicated by the background part 510 on the marker 160, and

[0077] sharpening Sb3 the power tool part 150 using the selected sharpening tool.

Claims

CLAIMS1. A power tool part (110, 140, 150) for a chain saw (100) associated with a saw chain type, the power tool part (110, 140, 150) comprising a marker (160) with a background part (510) and one or more text portions (520, 530) that at least partly overlap the background part (510),the background part (510) comprising a pattern and / or a color selected from a discrete set of patterns and / or colors, where each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool associated with the power tool part,where the at least one text portion (520, 530) indicates a dimension of the power tool part.

2. The power tool part (110, 140, 150) according to claim 1 , where the discrete set of patterns and / or colors also comprises an empty frame background, where each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool, except for the empty frame background which indicates that the power tool part is agnostic to type of sharpening tool.

3. The power tool part (110, 140, 150) according to claim 1 or 2, where the one or more text portions (520, 530) are laser printed onto the power tool part.

4. The power tool part (110, 140, 150) according to any previous claim, where the background part (510) is deposited onto a surface of the power tool part by physical vapor deposition, PVD.

5. The power tool part (110, 140, 150) according to any of claims 1-3, where the background part (510) is deposited onto the surface of the power tool part by deposition of paint.

6. The power tool part (110, 140, 150) according to any of claims 1-3, where the background part (510) and the one or more text portions (520, 530) are printed onto a first surface of a sticker, the sticker comprising an adhesive layer on a second surface opposite to the first surface.

7. The power tool part (110, 140, 150) according to any previous claim, where a first text portion (520) out of the one or more text portions (520, 530) indicates a saw chain pitch.

8. The power tool part (110, 140, 150) according to any previous claim, where the first text portion (520) out of the one or more text portions (520, 530) indicates a saw chain gauge.

9. The power tool part (110, 140, 150) according to any previous claim, where the second text portion (520) out of the one or more text portions (520, 530) indicates a saw chain length.

10. The power tool part (110) according to any previous claim, where the power tool part (110) is a chain saw main body (110), where the marker (160) is arranged on an inside of a rear handle aperture (135) formed in the main body.

11. The power tool part (140) according to any of claims 1-9, where the power tool part (140) is a guide bar (140) for a chain saw, where the marker (160) is arranged on a proximal section (230) of the guide bar (140).

12. The power tool part (150) according to any of claims 1-9, where the power tool part (150) is a saw chain, where the marker (160) is arranged on a tie strap (330) of the saw chain.

13. A kit of parts comprising at least one power tool part (110, 140, 150) and at least one marker (160) with a background part (510) and one or more text portions (520, 530) that at least partly overlap the background part (510),where the background part (510) and the one or more text portions (520, 530) are printed onto a first surface of a sticker, the sticker comprising an adhesive layer on a second surface opposite to the first surface.the background part (510) on each marker comprising a pattern and / or a color selected from a discrete set of patterns and / or colors, where each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool,where the at least one text portion (520, 530) indicates a dimension of the power tool part.

14. A method for assembling a power tool (100) from an assortment of power tool parts (110, 140, 150) according to any previous claim, the method comprising selecting (Sa1) a main body (110) having a first marker (160),selecting (Sa2) a guide bar (140) having a second marker (160) which is compatible with the marker of the main body (110),selecting (Sa3) a saw chain (150) having a third marker (160) which is compatible with the second marker (160), andassembling the selected main body, the selected guide bar, and the selected saw chain to form the power tool.

15. A method for servicing a chain saw (100) comprising a power tool part (150) according to claim 1 , the method comprisinginspecting (Sb1) the marker (160) arranged on the power tool part (150), selecting (Sb2) a sharpening tool for sharpening a cutter element (300) of the power tool part (150) by matching the sharpening tool with the tool type indicated by the background part (510) on the marker (160), andsharpening (Sb3) the power tool part (150) using the selected sharpening tool.

16. A power tool part for a brush cutter or clearing saw, the power tool part comprising a marker (160) with a background part (510) and one or more text portions (520, 530) that at least partly overlap the background part (510),the background part (510) comprising a pattern and / or a color selected from a discrete set of patterns and / or colors, where each pattern and / or color in the discrete set of patterns and / or colors corresponds to a specific type of sharpening tool associated with the power tool part,where the at least one text portion (520, 530) indicates a dimension of the power tool part.

17. The power tool part according to claim 16, where a text portion (520) out of the one or more text portions (520, 530) indicates a centrum hole diameter of a saw blade for the brush cutter or clearing saw.

18. The power tool part according to claim 16 or 17, where a text portion (520) out of the one or more text portions (520, 530) indicates a blade diameter of a saw blade for the brush cutter or clearing saw.

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