A cutting blade for flush mounting on a cut-and-break tool

Abstract

An abrasive cutting blade (110, 800, 1500, 1700) for processing concrete and stone, the cutting blade comprising abrasive cutting segments (115) arranged around a periphery (810) of the cutting blade, where an intended axis of rotation (R) of the cutting blade extends through a central aperture (430) of the cutting blade having a nominal radius (r2), where the central aperture (420) is at least partly circular (820) with a nominal radius (r2), 0 where an axial depression (420) is formed in the cutting blade (800) around the central aperture (430), the axial depression (420) comprising an annular part (1510) that extends at an angle (a) relative to an extension plane (P) of the cutting blade to form an engagement surface arranged to engage a flange (410) on one side of the cutting blade and a radially outer part (340) of a hub face (310) on the other side of the cutting blade.

Description

[0001] TITLE

[0002] A CUTTING BLADE FOR FLUSH MOUNTING ON A CUT-AND-BREAK TOOL

[0003] TECHNICAL FIELD

[0004] The present disclosure relates to mounting of abrasive cutting blades flush on powercutters and other construction equipment suitable for cutting hard materials such as concrete and stone.

[0005] BACKGROUND

[0006] A powercutter is a device used to process hard materials such as concrete and stone. One or more abrasive cutting blades are mounted on the powercutter and rotatably driven to cut into the work object.

[0007] A cut-and-break tool is a type of powercutter with dual coaxial and parallel cutting blades mounted on the sides of a distal end of a blade support arm. A cut-and-break tool allows for deep cuts to be made, since the dual cutting blades on a cut-and-break tool are flush with the blade support arm and may therefore enter deep into the work object together with the support arm.

[0008] A wall saw is a powercutter-like device that is mounted on a rail and used to cut into a planar surface such as a wall. A wall saw also uses one or more abrasive cutting blades to cut into the planar surface. Flush cutting may be desired, e.g., when forming a cut close to the corner of a wall.

[0009] Floor saws and scarifiers are devices that can be used to cut into hard material horizontal surfaces such as concrete floor surfaces and the like. One or more abrasive cutting blades are mounted on the floor saw and used to cut into the surface. Flush cutting may be desired, e.g., when forming a kerf in a surface close to a wall.

[0010] Improved mounting arrangements for fixing one or more cutting blades flush on construction equipment are desired. US 2012 / 0304842 A1 describes a cut-and-break tool. The dual coaxial abrasive cutting blades of the cut-and-break tool comprise axial depressions that are formed in the cutting blade around a central aperture.

[0011] US 2021 / 0221021 A1 describes a hand-held powertool that is arranged to support an abrasive cutting blade by means of clamping wings formed in a central aperture of the blade.

[0012] SUMMARY

[0013] It is an objective of the present disclosure to provide improved abrasive cutting blades and associated construction equipment.

[0014] This objective is at least in part obtained by an abrasive cutting blade for processing concrete and stone. The cutting blade comprises abrasive cutting segments arranged around a periphery of the cutting blade, such as diamond abrasive cutting segments. The outer diameter of the cutting blade may be about 218mm. An axis of rotation of the cutting blade in use extends through a central aperture of the cutting blade. The central aperture is at least partly circular with a nominal radius of about 35mm, i.e., relatively large. An axial depression is formed in the cutting blade around the central aperture, i.e., a recess in the cutting blade plane that extends axially is formed around the central aperture of the cutting blade. This axial depression comprises an annular part that extends at an angle relative to an extension plane of the cutting blade to form an angled engagement surface. The angled engagement surface is arranged to engage a flange on one side of the cutting blade and a radially outer part of a hub face on the other side of the cutting blade. The flange presses the cutting blade against the hub face, thereby securing the cutting blade in position relative to the hub. The angled engagement surface simplifies centering of the abrasive cutting blade relative to the hub, which is an advantage. The angled engagement surface also provides a recess big enough to receive the flange, thereby enabling flush cutting by the abrasive cutting blade. It is an advantage that the angled engagement surface is annular and formed around the central aperture of the cutting blade since this allows a bearing and a fastening member to fit in the central aperture.

[0015] According to some aspects of the abrasive cutting blades described herein, the angle between the annular part and the extension plane of the cutting blade is between 22° and 26°, and preferably about 24°. This angle has been found to give a good tradeoff between axial build height of the cutting blade and ease of assembly. The angled annular surface forms a frustoconical shape which can be matched to a corresponding frustoconical recess formed in the radially outer part of the hub face. The two frustoconical surfaces engage to provide a stable support for the cutting blade relative to the hub.

[0016] The axial depression formed in the cutting blade may comprise an inner portion located radially inwards from the annular part. This inner portion extends parallel to the extension plane of the cutting blade. A part of this inner portion can be configured to enter into a tangential slot formed in the hub face, and thus used to axially lock the cutting blade to the hub, as will be discussed in more detail below. The inner portion also helps to align the extension plane of the blade with a desired plane of the cutting implement.

[0017] A depth of the axial depression, measured along the axis of rotation, may be between 1 ,7mm and 3,7mm, and preferably about 2,7mm. This depth is sufficient to receive a reasonably thick flange able to support the forces required to securely hold the cutting blade in fixed position relative to the hub. According to a preferred embodiment, the annular part of the axial depression has an outer diameter between 79mm and 99mm, and preferably about 89mm. The annular part of the axial depression preferably has an inner diameter between 62mm and 82mm, and preferably about 72mm. The nominal radius of the at least partly circular central aperture is between 33mm-37mm, and preferably about 35mm. Other dimensions are, of course, also possible. These example dimensions are suitable for a cutting blade having an outer diameter of between 200mm and 240mm, such as about 218mm.

[0018] The central aperture may in some cases be restricted relative to the nominal radius along at least one restriction section of the central aperture. According to a preferred embodiment, the restriction section is a circular segment of the central aperture having a radius smaller than the nominal radius. The circular shape restriction section provides a good support against the hub face, in particular against the bottom of a tangential slot formed in the hub face. The enlargement section may also be formed as a circular segment of the central aperture having a radius larger than the nominal radius. The tangential slot formed in the hub face will be discussed in more detail below.

[0019] According to some aspects, the abrasive cutting blade comprises two restriction sections that are mirrored from each other with respect to the axis of rotation. The dual restriction sections provide stability and improves centering of the cutting blade during assembly with the hub. More than two restriction sections may also be used to improve centering of the cutting blade further.

[0020] The central aperture may in some cases be enlarged relative to the nominal radius along at least one enlargement section of the central aperture. According to some aspects, the abrasive cutting blade comprises two enlargement sections that are mirrored from each other with respect to the axis of rotation. The enlargement sections allow an axial protrusion formed on the flange to enter past the extension plane of the cutting blade, in order to secure it better and to rotationally lock the cutting blade relative to the flange and relative to the hub. More than two enlargement sections can also be used. Aspects of the disclosure also relate to an abrasive cutting blade for processing concrete and stone. The cutting blade comprises abrasive cutting segments arranged around a periphery of the cutting blade. An intended axis of rotation of the cutting blade extends through a central aperture of the cutting blade, where an axial depression is formed in the cutting blade around the central aperture. The central aperture is partly circular with a nominal radius. The central aperture is restricted relative to the nominal radius along at least one restriction section of the aperture and enlarged relative to the nominal radius along at least one enlargement section of the aperture. This cutting blade has a central aperture designed to cooperate with the mounting arrangements discussed above and is therefore associated with the same advantages. The cutting blade is conveniently held in a temporary manner by the hub while an operator can assemble the flange to secure the cutting blade properly. The shape of the cutting blade aperture promotes torque transfer between the hub and the cutting blade.

[0021] Aspects of the disclosure furthermore relate to construction equipment such as cut-and-break tools that comprise an elongated blade support arm, where a hub is rotatably mounted at a distal end of the blade support arm to rotate about an axis of rotation. A radially outer and axially central peripheral surface of the hub defines a pulley arranged to engage a drive belt. The hub comprises hub faces that extend orthogonally to the axis of rotation on both sides of the pulley. Each hub face comprises a radially outer part arranged to engage an axial depression formed around a central aperture of a respective abrasive cutting blade. Each hub face is arranged to cooperate with a flange on an opposite side of the respective abrasive cutting blade to removably hold the abrasive cutting blade in position relative to the hub. This mounting arrangement does not involve a hub that is permanently attached to the cutting blade. The mounting arrangement therefore allows for replacement and inspection of the cutting blades without disassembly of the hub or the part of the construction equipment supporting the hub. A cutting blade can be replaced without affecting drive belt tension, which is an advantage.

[0022] The parallel and axially separated dual abrasive cutting blades extend along respective cutting blade planes that are flush with the lateral sides of the elongated blade support arm. This allows the construction equipment to be inserted deep into a work object, since the depth of the kerf is not limited by the axial extension of the flange, which is an advantage.

[0023] The support arm preferably comprises a fixed axle at the distal end that extends along the axis of rotation, upon which the hub can be supported. A bearing such as a ball bearing or a needle bearing can be arranged between the rotatable hub and the fixed axle to allow the hub to rotate freely about its axis of rotation. The hub preferably comprises at least one axially extending throughhole configured to cooperate with a respective fastening member arranged to impart opposing axial forces on the flanges in order to secure the abrasive cutting blade.

[0024] According to a preferred embodiment, each hub face is arranged to engage its respective abrasive cutting blade along an annular engagement surface that extends between an inner diameter and an outer diameter, where an outer diameter of the bearing is smaller than or equal to the inner diameter of the annular engagement surface. The bearing is located at the center around the fixed axle, and the annular surface extends radially outwards from the bearing. Thus, opposing axial forces imparted on the flanges and hub face does not affect the bearing, which is an advantage.

[0025] According to some aspects, the elongated blade support arm comprises an inner blade cover, separated from the parallel and axially separated dual abrasive cutting blades in an extension direction of the support arm, and extending along a segment of the cutting blades, where the inner blade cover is flush with the abrasive cutting blades. The inner blade cover can be inserted together with the cutting implement into the work object, where it prevents loose matter from being jettisoned out from the kerf. According to some aspects, the inner blade cover comprises upper and lower pivotable portions that can adjust to the work object, as will be discussed and illustrated in more detail below.

[0026] The construction equipment may also comprise an outer blade cover that is arranged radially outwards from the inner blade cover. The outer blade cover is arranged to pivot about a pivot point removed from the parallel and axially separated dual abrasive cutting blades in the extension direction of the support arm.

[0027] 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.

[0028] BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present disclosure will now be described in more detail with reference to the appended drawings, where

[0030] Figures 1A-B illustrate example construction equipment;

[0031] Figures 2A-C show a blade mounting arrangement according to prior art; Figures 3A-B show an example hub part of a blade mounting arrangement; Figures 4-6 illustrate details of example blade mounting arrangements; Figure 7 shows another example hub part;

[0032] Figure 8 illustrates an example cutting blade;

[0033] Figure 9 shows an example cutting blade assembly for flush cutting; Figure 10A-C show example cutting blade central apertures,

[0034] Figure 11 shows example details of a blade mounting arrangement; Figures 12A-B show details of an example flange;

[0035] Figures 13A-B are flow charts illustrating methods;

[0036] Figure 14 shows a distal end of a blade support arm;

[0037] Figures 15A-B schematically illustrate an abrasive cutting blade;

[0038] Figures 16A-B show example central apertures of a cutting blade;

[0039] Figures 17A-D illustrate some example dimensions of a cutting blade; Figure 18 schematically shows a hub face with a locking tool; and Figure 19 shows an example cutting blade assembly for flush cutting.

[0040] DETAILED DESCRIPTION

[0041] The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain aspects of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments and aspects set forth herein; rather, these embodiments are provided by way of example so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout the description.

[0042] It is to be understood that the present invention is not limited to the embodiments described herein and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the appended claims.

[0043] Figure 1A illustrates example construction equipment 100, in this case a cut-and-break tool. Cut-and-break tools are hand-held concrete processing tools with two parallel, axially separated and coaxial abrasive cutting blades 110 that are mounted on a blade support arm 140, as illustrated in Figures 2A-C which show a mounting arrangement according to prior art where the center hub of the cutting implement is formed by two halves that are permanently attached to the cutting blades, i.e., that form an integral part of the cutting blade.

[0044] Aspects of the present teachings also relate to single blade construction equipment such as wall saws and floor saws. A mounting arrangement with at least one cutting blade attached to the mounting arrangement is referred to herein as an abrasive cutting implement.

[0045] The cut-and-break tool in Figures 1A-B comprises a front handle 150 that extends transversally to the body of the tool and a rear handle 160 that is located distal from the cutting blade 110 compared to the front handle 150. A trigger 161 with a lock-out function 162 is arranged in connection to the rear handle 160.

[0046] The blade support arm 140 on a cut-and-break tool is relatively long in comparison to the blade diameter. According to an example the blade support arm 140 extends from a proximal end 141 to a distal end 145 (schematically illustrated in Figure 14). The length of the blade support arm 140 from the proximal end 141 to the distal end 145 is about twice the diameter of the cutting blade 110, or at least 1 ,5 times the diameter of the cutting blade 110.

[0047] The blade diameter of the cutting blades 110 on a cut-and-break tool is normally smaller compared to traditional power cutters. The blade diameter of the cutting blades 110 is normally smaller than 250mm, such as about 220mm. The example cutting blade 1700 discussed below in connection to Figure 17A has a diameter measured across the blade of 218mm.

[0048] The example construction equipment 100 in Figure 1A is powered by a crankcase scavenged two-stroke combustion engine 190. However, the blade mounting arrangements, and the cutting blades disclosed herein can also be used on electrically powered construction equipment without significant modifications.

[0049] The motor 190 powered a drive pulley located at the proximal end of the blade support arm 140. A drive belt connects the drive pulley to a pulley located at the distal end of the blade support arm 140 which drives the cutting blades. The two parallel, axially separated and coaxial cutting blades 110 are flush with the blade support arm 140, i.e., the faces of the cutting blades 110 represent the outermost part of the cutting implement along the axis of rotation R of the cutting implement, which allows the entire blade support arm 140 to be inserted together with the cutting blades 110 into a work object 101, as illustrated in Figure 1B. This way a kerf deeper than half the cutting blade diameter can be made.

[0050] The parallel, axially separated and coaxial cutting blades 110 are partly covered by an inner blade cover 170 and by an outer blade cover 180. The inner blade cover 170 is separated from the cutting blades in an extension direction of the support arm 140, and extend along a segment of the cutting blades facing the user guiding the tool by the front and rear handles 150, 160. The inner blade cover 170 is flush with the abrasive cutting blades, allowing the inner blade cover to be inserted into the work object 101 as shown in Figure 1B. The inner blade cover 170 may comprise an upper part 171 and a lower part 172 as shown in Figure 1 B, where one or both parts are pivotably mounted on the support arm 140.

[0051] The outer blade cover 180 is arranged radially outwards from the inner blade cover 170, i.e., further from the work object 101 in use compared to the inner blade cover 170. The outer blade cover 180 is also arranged to pivot 175 about a pivot point 171 removed from the parallel and axially separated dual abrasive cutting blades in the extension direction of the support arm 140.

[0052] Generally, that a cutting blade is mounted flush with some type of blade support arm means that the cutting blade defines the outermost limit of the cutting implement 130 along the axis of rotation R of the cutting blade 110. A cutting blade mounted flush on construction equipment cannot be attached by a flange or bolt that extends out from the extension plane of the blade. The extension planes of the cutting blades 110 in Figure 2B are indicated as P1 and P2. The planes P1 and P2 delimit the cutting implement 130 in direction of the axis of rotation R.

[0053] Generally, an axial direction of the mounting arrangement and of the cutting blade in use is a direction aligned with the axis of rotation R. A radial direction is orthogonal to the axis of rotation R. A tangential direction is orthogonal to the radial direction and to the axial direction.

[0054] One way to realize a mounting arrangement for rotatably fixing a cutting blade 110 flush on construction equipment 100 is, as mentioned above, to integrate the cutting blade 110 with a half-portion of a hub 200 that also forms part of a pulley wheel that can be used to drive the cutting blade 110, as illustrated in Figures 2A-B.

[0055] A center bolt 210 extends through the cutting blades 110 and through the hub 200 to rotatably fix the cutting blades flush to the construction equipment 100. The center bolt head is recessed into a depression formed in the cutting blade, such that it does not protrude out from the cutting blade plane.

[0056] This type of mounting arrangement is well-known known and will therefore not be discussed in more detail herein. Cut-and-break tools are discussed in, e.g., EP2512764 and will therefore not be discussed in more detail herein.

[0057] Most hand-held powercutters, such as the cut-and-break tool shown in Figures 1 A-B, are driven by endless V-belts that extend from the drive motor to the hub located inside the support arm of the tool. However, other transmissions are also possible, such as toothed drive belts, chain drives, and shaft-based gear transmissions. The mounting arrangements and cutting blades disclosed herein are not limited to any particular form of power transmission arrangements.

[0058] The blade mounting arrangements described herein are applicable in cut-and-break tools of the kind illustrated in Figures 1A-B, and also in other types of construction equipment, such as powercutters, floor saws and wall saws, although in these applications a single cutting blade is normally used.

[0059] A floor saw with a flush mounted abrasive cutting blade will be able to form a kerf next to a wall or other obstacle.

[0060] A wall saw with a flush mounted abrasive cutting blade will be able to form a kerf in a wall in connection to a corner, i.e., next to another wall.

[0061] It has been realized that the type of mounting arrangement illustrated in Figures 2A-C, i.e., where the hub 200 is integrally formed with the cutting blade 110, e.g., welded onto the cutting blade 110 drives both cost and complexity of the cutting blade. A hub that is integrally formed with the cutting blade is difficult to separate from the cutting blade and is therefore normally discarded when the cutting blade is replaced. It is preferred to allow separation of the hub 200 from the cutting blade 110 in a convenient manner in order to be able to re-use the hub 200 when the cutting blade has been worn out and needs to be replaced. Another drawback associated with legacy abrasive cutting blades for cut-and-break tools is that the drive belt tension must be released when the blades are replaced. This makes the process of replacing blades more difficult.

[0062] More stable and easy to use mounting arrangements for fixing a cutting blade flush on construction equipment are desired.

[0063] Figures 3A-B and Figure 4 show a mounting arrangement 400 for fixing a cutting blade 110 flush on construction equipment 100 such as on the blade support arm 140 of a cut-and-break tool. The mounting arrangement 400 comprises a hub 300 with a hub face 310 and a flange 410 arranged to rotate with the hub 300 about an axis of rotation R. The hub 300 and the flange 410 are separable from the cutting blade 110, i.e., the hub 300 is not permanently attached to the cutting blade 110 such as by welding or the like. This allows the hub and flanges to be re-used when the cutting blade is replaced, which is an advantage.

[0064] A similar mounting arrangement 900 will be discussed in connection to Figure 9 below. Example cutting blades 800, 1500, 1700 suitable for use with the mounting arrangements described herein will be discussed in connection to Figure 8, Figures 15A-B and Figures 17A-D below.

[0065] Figure 4 shows how the cutting blades are assembled with the mounting arrangement 400. One or two cutting blades can be mounted in this manner. Le., one side of the hub 300 can be left without a cutting blade, e.g., in case the mounting arrangement is used on a floor saw or on a wall saw where dual blades are not wanted.

[0066] The hub face 310 and the flange 410 are arranged to engage opposite sides of a depression 420 formed around a central aperture 430 of the cutting blade 110. The cutting blade 110 is held in position by the opposing forces exerted on the blade by the hub face on one side and by the flange on the opposite side. The hub, cutting blade, and flange all rotate about the same axis of rotation R. The depression 420 formed around the central aperture 430 is normally of annular shape, delimited by the central aperture on its radially inner side and by the cutting blade face on its radially outer side. The flange 410 is matched to the depression 420 formed in the cutting blade 110 and comprises a recess that accommodates the center bolt head 465, which means that no parts of the flange 410, hub 300, or center bolt 460 extends out from the extension plane of the cutting blade 110. The flange 410 in the illustrated examples also comprises an annular surface 470 located peripherally that is matched to the depression 420 formed around the central aperture of the cutting blade. In other words, according to an example, the flange 410 comprises a central depression 450 extending axially in direction of the hub 300. The central depression 450 of the flange 410 is arranged to receive a bolt head 465 fully. This assembly mechanism corresponds to known assembly mechanisms, which means that existing tools can be used to mount a cutting blade, as illustrated in Figure 2C.

[0067] There is no need to remove the hub 300 in order to exchange a cutting blade 110. This is an advantage since an operator does not have to release drive belt tension, nor disassemble any part of the blade support arm 140 of the powertool 100, in order to exchange one or more existing cutting blades. With reference to Figure 3A, and in particular the schematic insert 303 in Figure 3A, a radially outer part 340 of the hub face 310 is configured to engage the cutting blade 110, while a central part 350 of the hub face 310 is adapted to engage the flange 410. In this example the radially outer part 340 of the hub face 310 is angled to accommodate the angled depression 420 formed in the cutting blade 110.

[0068] The center bolt 460 preferably extends along the axis of rotation R through each flange 410 and through the hub 300 to fix the cutting blade or blades 110, 800. The bolt head of the center bolt 460 is accommodated in the recess formed in the flange 410, while the center bolt nut or threaded counterpart is accommodated in the center recess formed in the flange on the opposite side in case of two flanges.

[0069] The central part 350 of the hub face 310 is raised up from the hub face in the illustrated examples, as can be seen in Figure 3B. The cutting disc 110 mates with the radially outer part 340 of the hub face, where it is fixed by the peripheral annular angled surface of the flange 410.

[0070] A periphery 355 of the central part 350 of the hub face 310 comprises radial indentations 330 keyed to corresponding restrictions in the central aperture 430 of the cutting blade 110. These indentations 330 form axial passages that connect with respective tangential slots 360 which extend at least partly around the central part 350 of the hub face 310. The slots 360 open radially outwardly and extend along an annular path at least partly around the hub face 310. The slots 360 are designed to enfold a radially inwards protruding part formed in the central aperture of the cutting blade. Examples of such aperture restrictions are discussed in connection to Figure 8 and Figures 10A-C.

[0071] The radial indentations are, according to a preferred embodiment, keyed to corresponding radial restrictions formed in the central aperture of the cutting blade. The indentations may, e.g., be matched to a given shape of radial restrictions such that the radial restrictions can pass the indentations in an axial direction and enter the tangential slots, or at least configured to be larger than a given shape of radial restriction on a cutting blade.

[0072] Figure 5 and Figure 6 illustrate an example of this type of tangential slot 360 which extends at least partly around the circumference of the central part 350 of the hub face 310. A cutting blade 110 having a central aperture shaped to match the central part 350 of the hub face 310 may be placed on the hub 300 such that the central part 350 of the hub face 310 extends through the central aperture of the cutting blade 110. A restriction formed in the central aperture of the cutting blade may then be moved back and forth in the tangential slot 360, as indicated by the arrow M in Figure 5, and by the dashed lines in Figure 6.

[0073] Figure 11 shows another example with terminated tangential slots, similar to the example in Figure 6.

[0074] A cutting blade 110 comprising a restriction of its central aperture matched to the tangential slot may be locked in position by turning the cutting blade relative to the hub 300 about the axis of rotation R, in which case the restriction will enter into the tangential slot, thus locking the cutting blade and preventing it from moving in at least the axial direction. This feature may be referred to as an interlock feature of the mounting arrangement.

[0075] An advantage associated with cutting blade mounting arrangements comprising the interlock features described herein is that a cutting blade will not fall off or be ejected in case the flange fixing it in position inadvertently falls of. This reduces the hazards associated with using construction equipment comprising the mounting arrangement.

[0076] One, two or more such restrictions with corresponding indentations may be used. Generally, two or three restrictions are preferred, since this centers the cutting blade on the hub 300 better than if, say, a single restriction and slot would have been used.

[0077] With reference to Figure 6, to assemble a cutting blade 110 on construction equipment 100 comprising the mounting assembly 400, 900 according to the present disclosure, the cutting blade 110 is first aligned with the radial indentations 330 keyed to the corresponding restrictions 610 in the central aperture 430 of the cutting blade 110. This allows the central part 350 of the hub 300 to enter through the central aperture 120 of the cutting blade 110 in the axial direction, and the restrictions 610 formed in the cutting blade 110 to enter into the tangential slots 360 that extend at least partly around the central part 350 of the hub face 310. Once in this position, the cutting blade 110 can be rotated M about its axis of rotation R, relative to the hub 300, which causes the restrictions to traverse the tangential slots 360, thereby locking the cutting blade relative to the hub 300 at least axially. Thus, the mounting arrangement provides an interlock feature that makes cutting blade installation more convenient. The interlock feature centers the cutting blade relative to the axis of rotation, such that it mates better with the flange.

[0078] According to some aspects, opposite hub faces 310, 710 on the hub 300 comprise radial indentations 330 of different geometries, i.e., shaped differently. The radial indentations can then be keyed to corresponding restrictions in central apertures 430 of two different cutting blade types, such as a left cutting blade and a right cutting blade of a cut-and-break tool. The different radial indentation geometries ensure that only a certain type of cutting blade can be used on one side of the cut-and-break tool, and only a certain cutting blade of another type can be used on the other side of the cut-and-break tool.

[0079] In the example hub 300 illustrated in, e.g., Figure 5, the tangential slots 360 extend along a portion of the periphery 355 of the central part 350 of the hub face 310 between two radial indentations 330. The tangential slots 360 are terminated after a distance D before the tangential slot connects with the next indentation 330. A technical effect of terminating the tangential slots in this manner is that the cutting blade is also rotationally fixed in one direction of rotation, at least once the aperture restriction on the cutting blade abuts a terminal point 365 of the tangential slot 360.

[0080] However, as exemplified in Figure 7, the tangential slots 360 may also be shaped to connect two adjacent indentations in order to form a continuous slot 720 that extends along the periphery 355 of the central part 350 of the hub face 710. Note how the indentations 330 in this example open up into tangential slots 720 that extend all the way to the next indentation 330. Thus, a cutting blade such as the blade 800 illustrated in Figure 8 may rotate freely in the tangential slot 720 about the axis of rotation R. An advantage associated with this realization of the tangential slot 720 is that a user is less likely to forget to assemble the flange in order to fix the cutting blade 110, since the cutting blade will not be rotationally fixed by the hub 300.

[0081] Blade alignment markers 750 may be formed on the hub face 310 indicative of a rotation of the hub 300 about the axis of rotation R. These blade alignment markers may be used to align corresponding markers 850 on the cutting blade (exemplified in Figure 8) at the correct angle to mate with the hub face 310. Referring again to Figures 3A-B, it is noted that the hub 300 forms a support for the cutting blade 110 on one side and is shaped as a pulley in its axial center part, where an axially central and radially outward part of the hub 300 defines angled surfaces 320 of a pulley groove or a chain sprocket. The pulley may be a V-belt type pulley as shown in the example illustrations, or some other type of pulley, such as a toothed belt pulley. A chain drive sprocket can be used instead of a drive belt pulley.

[0082] The hub 300 may be formed as one piece or formed by two halves 301 , 302 split orthogonally with respect to the axis of rotation R as shown in Figure 3A, where the two halves are arranged to be held together by at least one radially offset fastening member 380, and preferably two symmetric radially offset fastening members 380. By forming the hub in two halves in this manner it can be retrofitted on legacy equipment designed for cutting blades with integrated hubs as shown in Figures 2A-B, which is an advantage. New equipment designed specifically for cutting blades without an integrated hub may benefit from having integrally formed hubs already when leaving the factory. This avoids the need for the radially offset fastening members 380.

[0083] A center part 370 of the hub 300 is preferably arranged to be journaled in a bearing of the construction equipment 100, such as a bearing arranged at the distal end of the blade support arm 140.

[0084] With reference to, e.g., Figure 3A and Figure 7, the central part 350 of the hub face 310, 710 optionally comprises an axial height variation 390, 395, 730, 740, 760 that is adapted to mate with a corresponding inverted axial height variation 440, 450 formed on the face of the flange 410 arranged to engage the hub face 310, 710. A height variation may be a difference in height over the hub face surface, such as the half-circle ridge-like portions 760 shown in Figure 7. A height variation may also be a distortion 740 or embossment of the annular central depression formed in the hub face, exemplified in Figure 7. The quarter-circle ridge-like portions 390 shown in Figure 3A are also examples of axial height variations of this kind. These height variations mate with inverted height variations formed on the face of the flange, such that the flange and the hub face fit together. It is appreciated that height variations of this kind can be formed in a number of different ways. The height variations shown in, e.g., Figure 3A and in Figure 7 are just exemplary height variations. The axial height variations ensure that the flange is correctly mounted, since if the height variations are not in agreement with their inverted counterparts formed in the flange, then the flange will not fit properly on the hub face 310. The height variations also resist slippage between the hub face and the flange, which improves torque transfer to the cutting blade 110.

[0085] The height variations in Figure 7 comprise an annular ridge-like portion 760 that extends around the peripheral circumference of the central part 350 of the hub face 310. The indentations 330 discussed above are formed at least partly in this ridge-like portion 760. Embossments 740 are also formed in the central depression of the hub face 310.

[0086] The axial height variations optionally comprise at least one recess 730 or through-hole formed in a radially outer part of the hub face 310. This recess is arranged to receive a matching protrusion 910 formed on the flange 410, as can be seen in Figure 9. The protrusion 910 extends from the flange through the cutting blade 110 and into the hub akin to a key. Thus, the protrusion 910 rotationally locks the cutting blade relative to the hub and to the flange, which promotes torque transfer between the hub 300 and the cutting blade 110. The protrusion 910 also renders the blade mounting assembly more stable.

[0087] The axial protrusion 910 exemplified in Figure 9 and the way it cooperates with the cutting blade 110 and the center hub 300 to rotationally lock the cutting blade to the center hub is not inextricably linked to the features relating to the tangential slot. It is possible to design a cutting implement which lacks the tangential slot feature and the restriction sections 830 shown in Figure 8, but comprises one or more enlargement sections 840 and the axial protrusions 910 that are arranged to enter past the enlargement sections and into the recesses 730 formed in the center hub 300. The axial protrusions then provide a rotational lock between the flange 410 or flanges and the center hub. In case the enlargement sections are formed so as to abut the axial protrusions 910 in assembled position, then the axial protrusions also effectively lock the cutting blade relative to the flange and to the hub. In other words, there is disclosed herein a mounting arrangement 900 tor fixing a cutting blade 800 flush on construction equipment 100. The mounting arrangement 900 comprises a hub 300 with a hub face 310, 710 and a flange 410 arranged to rotate with the hub 300 about an axis of rotation R. The hub face 310, 710 and the flange 410 are arranged to engage opposite sides of a depression 420 formed around a central aperture 430 of the cutting blade 110, 800, where the flange 410 is matched to the depression 420, to fix the cutting blade against the hub 300 flush with the cutting blade. A radially outer part 340 of the hub face 310, 710 is configured to engage the cutting blade 110, 800 and a central part 350 of the hub face 310, 710 is adapted to engage the flange 410. The radially outer part 340 of the hub face 310, 710 comprises at least one recess 730, arranged to receive a matching protrusion 910 formed on the flange 410. This mounting arrangement is designed to fix a cutting blade to construction equipment. The abrasive cutting blade 800 suitable for use with the mounting arrangement 900 comprises abrasive cutting segments 115, 1910 arranged around a periphery 810 of the cutting blade 110, 800. An intended axis of rotation R of the cutting blade 800 extends through a central aperture 120 of the cutting blade 800, where an axial depression 420 is formed in the cutting blade 800 around the central aperture 120. The central aperture 120 is partly circular 820 with a nominal radius r2, where the central aperture 120 is enlarged r3 relative to the nominal radius r2 along at least one enlargement section 840 of the aperture to receive the axial protrusion 910 or the axial protrusions 910 formed on the flange, as shown in, e.g., Figure 9. According to a preferred embodiment, one of the flanges 410 supports the center bolt 460 while the flange on the opposite side comprises a threaded center hole 940 adapted to mate with the threads on the center bolt 460 to hold the blade assembly together. This way there is no need for a separate nut. Figures 12A-B illustrate an optional feature 1200 of the center bolt 460. As discussed herein, assembly of the mounting arrangement comprises axially aligning the center hub 300 with one or two cutting blades 110, 800 and one or two flanges 410 on opposite sides of the hub 300 to form a cutting implement. A center bolt 460 holds everything together, as shown in Figure 9. It is of course desired that an operator assembles the cutting implement in the correct way, and not with misalignment or other mismatches between the different parts of the cutting implement. To avoid that an operator tightens the center bolt despite misalignment of some parts of the cutting implement, it has been realized that the length of the center bolt 460 can be configured such that it cannot reach and engage a corresponding inner thread of a cooperating member (such as the opposite flange) to fix the cutting blade 110, 800, unless an axial protrusion 910 formed on the bolt head side flange has entered sufficiently far into a matching recess formed in the hub 300. If the mounting arrangement 400, 900 is not correctly aligned, then the axial protrusion will not enter into its matching recess formed in the hub face 310, and it is then impossible to tighten the center bolt 460, since the threads on the center bolt 460 will not reach its counterpart threaded member.

[0088] Put differently, the length L2 of the axial protrusion 910 is large enough relative to the length L1 of the center bolt 460 to require that the axial protrusion 910 enters into a recess formed in the hub 300 in order for the center bolt 460 to reach the threads of the cooperating member.

[0089] Yet another way to describe this feature is that when the flange 410 and the hub 300 are axially separated from each other but otherwise correctly aligned with each other, then a distance measured from a distal end of the axial protrusion 910 to the recess 1220 in the hub 300 is always smaller than a distance from the distal end of the center bolt 460 to the threads of the cooperating member. If this is the case, then the axial protrusion 910 will enter into the recess 1220 before the center bolt 460 can engage the threads of the cooperating member. It will not be possible to tighten the bolt unless the axial protrusion has correctly entered into the hub 300, which it cannot do unless all the parts of the cutting implement are correctly positioned relative to each other.

[0090] Figure 12A shows an example flange 410 with a center bolt 460. The center bolt 460 is aligned with the center hole 1210 formed in the hub face 310, and the axial protrusion 910 is aligned with its matching recess 1220 formed in the hub face 310, in other words the components of the assembly are correctly aligned in relation to each other. The axial length L1 of the center bolt 460 is such that the threads on the center bolt 460 will not reach the inner thread of the cooperating member unless the axial protrusion 910 enters into the recess 1220. An operator trying to assemble the cutting implement in the wrong way will not be able to tighten the center bolt 460, since its threads will not reach the cooperating member on the other side unless the axial protrusion also enters the recess 1220, which is can only do if all the parts are correctly positioned relative to each other.

[0091] With reference to the schematic illustration in Figure 12B, the center bolt 460 is only able to engage the inner thread 1230 of the cooperating member if the axial protrusion 910 also enters into the recess 1220, otherwise the axial protrusion will abut against the hub face 310 and prevent the center bolt from entering sufficiently far into the hub 300. Thus, the center bolt 460 can only be tightened when the cutting implement is correctly assembled, and not otherwise.

[0092] The cooperating member of the center bolt 460 may be integrally formed with the second flange 410, i.e., the flange on the opposite side of the mounting assembly, as shown in Figure 12B. However, the cooperating member can also be a threaded part of a bore formed in the hub 300, or a nut configured to engage the center bolt on the opposite side of the hub 300.

[0093] This feature of the center bolt 460 that is illustrated in Figures 12A-B is not inextricably linked to any of the other features disclosed herein. Thus, there is disclosed herein a mounting arrangement 400, 900 for fixing a cutting blade 110, 800 flush on construction equipment 100. The mounting arrangement 400, 900 comprises a hub 300 with a hub face 310, 710 and at least one flange 410 arranged to rotate with the hub 300 about an axis of rotation R. A center bolt 460 extends along the axis of rotation R through the flange 410 and into the hub 300 to a cooperating member to fix the cutting blade 110, 800, The cooperating member may form part of an opposite flange 410, or some other cooperating member with an inner thread matched to the thread of the center bolt 460. A relationship between the length L1 of the center bolt 460 and a length L2 of an axial protrusion 910 formed on the flange 410 is configured to prevent the center bolt 460 from engaging an inner thread 1230 of the cooperating member unless the axial protrusion 910 has entered sufficiently far into a corresponding recess 1220 formed in the hub face 310.

[0094] The center bolt 460 is optionally rotatably attached to one of the flanges 410, e.g., by a stop washer 1240 as schematically illustrated in Figure 12B. The stop washer 1240 allows the center bolt 460 to rotate about the center axis 1250, but will stay attached to the flange 410. This means that the center bolt 460 is hard to lose, since it forms a part of the flange 410.

[0095] At least some of the abrasive cutting implements 130 described herein comprise a cutting blade 110, 800, such as a diamond cutting blade, and a mounting arrangement 400, 900 for fixing the cutting blade 110, 800 flush on construction equipment 100. The mounting arrangement 400, 900 comprises a hub 300 with a hub face 310, 710 and a flange 410 arranged to rotate with the hub 300 about an axis of rotation R, as discussed above. The hub face 310, 710 and the flange 410 are arranged to engage opposite sides of an axial depression 420, normally an axial annular depression, formed around a central aperture 430 of the cutting blade 800, where the flange 410 is matched to the depression 420, to fix the cutting blade against the hub 300 flush with the cutting blade. This type of flush cutting implement was discussed above in connection to Figures 1 A-B and Figure 2B. A radially outer part 340 of the hub face 310, 710 is configured to engage the cutting blade 800 and a central part 350 of the hub face 310, 710 is adapted to engage the flange 410, where a center bolt 460 extends along the axis of rotation R of the cutting implement 130 through the flange 410 and through the hub 300, e.g., as shown in Figure 9, where the flange 410, on the one hand, and the cutting blade 110, 800 and / or the hub 300, on the other hand, are arranged to be rotationally locked to each other through complementary axially extending structures located radially offset from the center bolt 460. The complementary axially extending structures may be exemplified by the axial height variations discussed herein. This way the cutting blade 110 and the flange 410 are rotationally locked to each other by the protrusion 910 that extends axially out from the flange 410. Thus, a more secure attachment able to support larger torque is obtained. Figure 8 shows an example of an abrasive cutting blade 800 for processing concrete and stone. This cutting blade 800 is compatible with at least some of the mounting arrangements discussed herein. The cutting blade 800 comprises abrasive cutting segments 115, 1910 arranged around a periphery 810 of the cutting blade 110, 800. Diamond cutting segments are preferred, although other abrasives can also be used, such as carbide abrasive cutting segments.

[0096] An intended axis of rotation R of the cutting blade 800 extends through a central aperture 120 of the cutting blade 800. A depression 420 is formed in the cutting blade 800 around the central aperture 120. This depression allows the flange to be mounted flush with the extension plane of the cutting blade 800, as discussed above.

[0097] Figure 8 illustrates one example of the central aperture 120 that is based on circle segments of different radii r1 , r2, and r3. Figures 10A-C show additional examples of the central aperture 120 with different geometries. It is appreciated that corresponding hub faces 310 can be formed to match the example cutting blade apertures of these examples. The section with the smallest distance r1 from the axis of rotation R is the restriction which enters into the tangential slot 360, 720 discussed above. A benefit of using a circular restriction as in Figure 8 and in Figure 10C is that a more stable contact is achieved between the cutting disc and the bottom of the tangential slot which netter centers the cutting blade and holds it more firmly in position. Thus, according to a preferred aspect, the restriction section 830 is a circular segment of the central aperture 120 having a radius r1 smaller than the nominal radius r2. The circular restriction section will engage the tangential slot along a portion of the tangential slot, thus resulting in better centering of the cutting blade relative to the hub 300, and also a more stable assembly overall. However, all of the examples in Figures 10A-C can be used with a hub of the kind exemplified in Figure 3A and in Figure 7. In all examples, the central aperture 120 is partly circular 820 with a nominal radius r2. The central aperture 120 is restricted relative to the nominal radius r2 along at least one restriction section 830 of the aperture and enlarged relative to the nominal radius r2 along at least one enlargement section 840 of the aperture. The restriction section is configured to enter into the tangential slot 360, 720 discussed above, while the enlargement is shaped so as to allow the protrusion 910 on the flange 410 to pass.

[0098] The enlargement section 840 may also be formed as a circular segment of the central aperture 120 having a radius r3 larger than the nominal radius r2. The abrasive cutting blade 800 preferably comprises two restriction sections 830 mirrored from each other with respect to the axis of rotation R. Generally, one or more restriction sections 830 may be formed in the cutting blade, such as three restriction sections evenly spaced along the central part of the hub. The abrasive cutting blade 800 preferably comprises two enlargement sections 840 mirrored from each other with respect to the axis of rotation R. Generally, one or more enlargement sections 840 may be formed in the cutting blade, such as three enlargement sections evenly spaced along the central part of the hub.

[0099] According to an example, suitable for a cut-and-break tool of the kind illustrated in Figures 1 A-B, the nominal radius r2 is between 33mm-37mm, and preferably about 35mm. A distance measured from the axis of rotation R to the most distant point along the enlargement section 840, i.e., r3, is between 34mm-40mm, and preferably about 37mm. A distance measured from the axis of rotation R to the closest point along the restriction section 830, i.e., r1 , is between 30mm-36mm, and preferably about 33mm. Generally, r1 is smaller than r2 which is smaller than r3.

[0100] The depth of the tangential slots 360 is preferably between 1mm -3 mm, such as around 2mm.

[0101] The radial width of the protrusions on the flange is about 3mm-5mm, such as around 4mm. The abrasive cutting blade 800 comprises optional blade alignment markers 850 formed in connection to the central aperture 120, as well as an optional blade rotation direction marker 860. These markers provide indication to an operator regarding, e.g., rotational relationship between hub and cutting blade, as well as providing guidance regarding which way to mount the cutting blade on the hub 300.

[0102] Note that the depression 420 formed around the central aperture 430 of the cutting blade 800 will extend in opposite directions when the optional blade rotation direction marker 860 is used. The left hand blade and the right hand blade of the cut-and-break assembly will have depressions 420 that extend inwards towards the hub 300. The blade rotation direction marker 860 is useful in case the abrasive segments 115 have a preferred direction of rotation. The hub 300, the at least one flange 410, and the at least one cutting blade 110, 800 discussed herein form a cutting implement 130 which can be used with advantage on, e.g., a cut-and-break tool, a floor saw, a wall saw, or on some other type of construction equipment 100 used to process hard materials such as concrete and stone. The cutting implement 130 enables flush cutting. Flush cutting is an important feature in a cut-and-break tool since it allows the cutting implement to enter into a work piece and thus make deep cuts. Flush cutting in a floor saw or a wall saw allows kerfs to be made close to objects and other surfaces extending out from the surface in which the kerf is to be made. Flush cutting of this type is enabled by an abrasive cutting implement 130 for cutting hard materials such as concrete and stone. The implement comprises a cutting blade 110, 800 and a mounting arrangement 400, 900 for fixing the cutting blade 110, 800 flush on construction equipment 100. The mounting arrangement 400, 900 comprises a hub 300 with a hub face 310, 710 and a flange 410 arranged to rotate with the hub 300 about an axis of rotation R. The hub face 310, 710 and the flange 410 are arranged to engage opposite sides of a depression 420 formed around a central aperture 430 of the cutting blade 800, as discussed above. The flange 410 is matched to the depression 420 in a way that no part of the flange extends beyond the cutting blade plane P1 , P2. Thus, the cutting blade can be rotationally fixed against the hub 300 by the flange 410 flush with the cutting blade.

[0103] A radially outer part 340 of the hub face 310, 710 is configured to engage the cutting blade 800 and a central part 350 of the hub face 310, 710 is adapted to engage the flange 410. A periphery 355 of the central part 350 of the hub face 310, 710 comprises radial indentations 330 that form axial passages which connect with respective tangential slots 360, 720 that extend at least partly around the central part 350 of the hub face 310, 710, which slots 360, 720 have openings facing radially outwardly.

[0104] An intended axis of rotation R of the cutting blade 800 extends through a central aperture 120 of the cutting blade 800. This axis of rotation R is shared with the hub 300 and with the flange 410. An axial depression 420 is formed in the cutting blade 800 around the central aperture 120, this axial depression is matched to the shape of the hub face 310, allowing the cutting blade to mate with the hub face 310, as illustrated in, e.g., Figure 4 and in Figure 9. The axial depression 420 is normally of annular shape. The central aperture 120 is partly circular 820 with a nominal radius r2 matched to the central part 350 of the hub face 310, 710, as shown in Figure 8 and in the examples illustrated in Figures 10A-C. The central aperture 120 formed in the cutting blade 110, 800 is restricted r1 relative to the nominal radius r2 along at least one restriction section 830 of the aperture matched to the radial indentations 330 formed in the periphery 355 of the central part 350 of the hub face 310, 710. The shape of the restriction is matched or keyed to the radial indentations 330 formed in the hub face 310.

[0105] An operator wanting to assemble a cutting blade on the hub first aligns the rotation axes of the cutting blade with that of the hub, and the rotates the cutting blade about the axis of rotation so as to match the least one restriction section 830 of the aperture in the cutting blade with the radial indentations formed on the hub face 310. The cutting blade 110, 800 can then be mated with the hub, which means that the restriction section or sections formed in the cutting blade central aperture also enters down into the tangential slot or slots T1

[0106] formed in the hub face. The cutting blade can then be rotated about its axis of rotation to axially lock the cutting blade to the hub. Having locked the cutting blade to the hub in this manner, an operator can then assemble the flange to press the cutting blade against the hub, thereby securing the cutting implement.

[0107] Figure 13A is a flow chart that illustrates a method for assembling a cutting implement 130 comprising a hub 300 arranged to cooperate with a flange 410 to rotationally lock a cutting blade 110, 800, where the cutting blade 110, 800 comprises a central aperture 120 with a shape matched to the hub 300, and where the hub 300 comprises a hub face 310 with tangential slots 360 arranged to receive one or more restriction sections 830 formed in the central aperture 120 of the cutting blade 110, 800. The method comprising coaxially aligning Sa1 the cutting blade 110, 800 and the hub 300, mating Sa2 the cutting blade 110, 800 with a hub face 310 of the hub 300, rotating Sa3 the cutting blade 110, 800 relative to the hub 300 to axially lock the cutting blade to the hub 300, and

[0108] fixing Sa4 the cutting blade 110, 800 to the hub 300 by the flange 410. The flange 410 may, e.g., be secured to the hub by means of a center bolt 460 that extends along the axis of rotation R through each flange 410 and through the hub 300 to fix the cutting blade or blades 110, 800.

[0109] Figure 13B is a flow chart that illustrates a method for disassembling a cutting implement 130 comprising a hub 300 arranged to cooperate with a flange 410 to rotationally lock a cutting blade 110, 800, where the cutting blade 110, 800 comprises a central aperture 120 with a shape matched to the hub 300, where the hub comprises a hub face 310 with tangential slots 360 arranged to receive one or more restriction sections 830 formed in the central aperture 120 of the cutting blade 110, 800, as discussed herein. The method comprises releasing Sb1 the flange 410 from a mated position with the hub 300, e.g., by releasing the center bolt 460 discussed in connection to Figure 4, rotating Sb2 the cutting blade 110, 800 relative to the hub 300 to allow axial release of the cutting blade from the hub 300, and removing Sb3 the cutting blade 110, 800 from the hub 300.

[0110] It is noted that the at least one restriction section 830 of the central aperture 120 of the cutting blade 110, 800 is arranged to be received in and to move along the tangential slots 360, 720 as the cutting blade 800 is rotated relative to the hub 300 to axially lock the cutting blade 110, 800 relative to the hub 300. This interlocking feature of the cutting implement was explained above in connection to, e.g., Figure 6 and Figure 11. The tangential slots 360, 720 are configured to enfold the at least one restriction section 830 of the central aperture 120 of the cutting blade 110, 800 axially on opposite sides of the cutting blade 110, 800. The relative rotation between the cutting blade and the hub is indicated by arrow M in Figure 5, Figure 6, and Figure 11. The cutting blade 110, 800 is arranged to be rotated M relative to the hub 300 in mated position with the hub 300 to an alignment rotation angle where the enlargement section 840 aligns with the recess 730 to receive the matching protrusion 910 formed on the flange 410.

[0111] The central aperture 120 formed in the cutting blade can also be enlarged r3 relative to the nominal radius r2 along at least one enlargement section 840 of the aperture, where the central part 350 of the hub face 310, 710 comprises an axial height variation 390, 395, 730, 740, 760 that is adapted to mate with a corresponding inverted axial height variation 440, 450 formed on the face of the flange 410 that is arranged to engage the hub face 310, 710.

[0112] The axial height variation of the hub face may also comprise at least one recess 730 formed in a radially outer part of the hub face 310 as exemplified in Figure 7. This recess is arranged to receive a matching protrusion 910 formed on the flange 410 which protrusion enters past the cutting blade and into the hub to rotationally lock both the flange and the cutting blade to the hub. The interacting recesses and protrusions makes it difficult to unintentionally assemble the cutting implement in the wrong way, and also improves the ability of the cutting implement to transmit torque to the cutting blade. Figure 9 shows an example of correctly aligned cutting blades and flanges prior to assembly with the hub.

[0113] Figure 14, Figures 15A-B, and Figures 17A-D show additional details of various abrasive cutting blades and construction equipment.

[0114] Figure 14 illustrates the cutting implement part of a cut-and-break tool 1400. The tool 1400 comprises an elongated blade support arm 140 arranged to be inserted into a work object 101 , as discussed above in connection to, e.g., Figures 1 A-B. A hub 300 is rotatably mounted at a distal end 145 of the blade support arm 140, to rotate about an axis of rotation R. According to an example the hub 300 is rotatably mounted by a bearing 1410 on a fixed axle of the support arm 140, which fixed axle is aligned with the axis of rotation R.

[0115] A radially outer and axially central peripheral surface of the hub 300 defines a pulley arranged to engage a drive belt which powers the cutting implement. The drive belt extends between the hub 300 and a drive pulley that is connected to a power source such as a combustion engine or an electric motor, as discussed above. A V-belt or a toothed belt may be used to power the cutting implement. Note that the distal end 145 of the support arm extends past the flange 410, i.e., the distance D4 is larger than the outer diameter D3 of the flange.

[0116] The hub 300 comprises hub faces 310 that extend orthogonally to the axis of rotation R on both sides of the pulley, e.g., as exemplified in Figure 9 above. Each hub face 310 comprises a radially outer part 340 arranged to engage an axial depression 420 formed around a central aperture 430 of a respective abrasive cutting blade 110, 800, 1500, 1700. Each hub face 310 is arranged to cooperate with a flange 410 on an opposite side of the respective abrasive cutting blade 110, 800, 1500, 1700 to removably hold the abrasive cutting blade in position relative to the hub 300. The engagement between the radially outer part of the hub face, the cutting blade, and the flange is radially between the outer radial limit of the bearing 1410 and the outer limit of the support arm. It has been realized that more simple designs of the hub 300 and the flanges 410 that cooperate with the hub 300 to hold the parallel cutting blades in position on a cut-and-breaktool are possible. These more simple designs may, e.g., lack the tangential slot 360 and / or the combination of the axial protrusions 910 on the flanges and the corresponding recesses 1220 formed in the hub faces 310. The less complex designs still allow an operator or a service technician to remove one or both cutting blades from the hub without releasing the drive belt and without removing the hub that defines the pulley.

[0117] Each hub face 300 is preferably arranged to engage its respective abrasive cutting blade along an annular engagement surface that extends between an inner diameter D2 and an outer diameter D3, as illustrated in Figure 14. The support arm 140 preferably comprises an axle at the distal end 145 that extends along the axis of rotation R. A bearing 1410 can then be arranged between the hub 300 and the axle to allow the hub 300 to rotate freely about the axis of rotation R. The example bearing 1410 in Figure 14 extends from an inner diameter DO that corresponds to the axle diameter up to an outer diameter D2.

[0118] The outer diameter D2 of the bearing 1410 can be made smaller than or equal to the inner diameter D2 of the annular engagement surface, which means that the engagement between flange, cutting blade, and hub is located to an annular engagement surface radially outwards from the bearing, as shown in Figure 14. This way no significant axial pressure is imparted on the bearing, which is an advantage.

[0119] A key technical feature of the hub 300 and the abrasive cutting blades, present also in the less complex versions, is the axial depression 420 that is formed in the cutting blade 800 around its central aperture 430. This axial depression 420 comprises an annular part 1510 that extends at an angle a relative to an extension plane P of the cutting blade to form an engagement surface arranged to engage a flange 410 on one side of the cutting blade and a radially outer part 340 of a hub face 310 on the other side of the cutting blade. This annular part 1510 allows the flange to be received in the center cavity formed in the cutting blade, such that the flange is flush with the cutting blade, or in other words does not extend axially past the extension plane P of the cutting blade.

[0120] Figures 15A-B schematically illustrate an example of a simplified abrasive cutting blade 1500. This simplified abrasive cutting blade may comprise a circular central aperture 430, or comprise one or more of the restriction sections 830 discussed above and / or one or more of the enlargement sections 840. Some example central aperture geometries are schematically illustrated in Figures 16A-B. Figure 16A schematically illustrates a central aperture geometry with two opposing restriction sections 830. Figure 16B schematically illustrates a central aperture geometry with two opposing enlargement sections 840.

[0121] Figures 15A-B schematically illustrate an abrasive cutting blade 1500 for processing a stone or concrete work object 101. The cutting blade comprises abrasive cutting segments 115, 1910 arranged around a periphery 810 of the cutting blade, e.g., as illustrated in Figure 14. An axis of rotation R of the cutting blade in use extends through a central aperture 430 of the cutting blade. The central aperture 430 may be circular with a nominal radius r2, possibly interrupted by one or more restriction sections and / or one or more enlargement sections 840, as exemplified in Figures 16A-B, i.e., the central aperture 430 is at least partly circular 820 with a nominal radius r2.

[0122] An axial depression 420 is formed in the cutting blade 800 around the central aperture 430, forming a cavity in the cutting blade. The flange 410 fits in this cavity, which means that the flange does not protrude axially out from the cutting blade in use.

[0123] The axial depression 420 comprises an annular part 1510 that extends at an angle a relative to an extension plane P of the cutting blade to form an engagement surface arranged to engage the flange 410 on one side of the cutting blade and the radially outer part 340 of a hub face 310 on the other side of the cutting blade. This annular part 1510 allows the cutting blade to be centered relative to the hub, which is an advantage. According to an example, the annular part 1510 of the axial depression 420 has an outer diameter D3 between 79mm and 99mm, and preferably about 89mm, as illustrated in Figure 17A. This size has been found suitable for a cut-and-break tool of the type illustrated in Figures 1 A-B. The annular part 1510 of the axial depression 420 preferably has an inner diameter D2 between 62mm and 82mm, and preferably about 72mm. A depth 1710 of the axial depression 420 measured along the axis of rotation R may be between 1 ,7mm and 3,7mm, and preferably about 2,7mm.

[0124] The angle a between the annular part 1510 and the extension plane P of the cutting blade, as exemplified in Figure 17B, is between 22° and 26°, and preferably about 24°.

[0125] The axial depression 420 comprises an optional inner portion 1520 radially inwards from the annular part 1510, which inner portion 1520 extends parallel to the extension plane P of the cutting blade. This inner portion may, e.g., comprise the restriction section 830 discussed above.

[0126] Figures 17A-D illustrate some example dimensions of an abrasive cutting blade that is suitable for use with a cut-and-break tool 100 of the type shown in Figures 1A-B and in Figure 14. Figure 17A shows the cutting blade and a section view. Figures 17B-D show various details, as indicated in Figure 17A. It is appreciated that the different dimensions indicated in Figures 17A-D are not necessarily inextricably linked to each other. One or more of the dimensions may be varied without affecting the other dimensions, at least not significantly, as appreciated by the skilled person.

[0127] According to the example in Figures 17A-D, an outer diameter D5 of the cutting blade is between 200mm and 240mm, and preferably about 218mm. The cutting segment height is about 9mm, meaning that the diameter of the cutting blade, measured from the radially inner parts of the cutting segments 115 is about 200mm.

[0128] According to the example in Figures 17A-D, a tangential spacing between the abrasive cutting segments 115 is between 2mm and 4mm, and preferably about 3mm. The length of the enlargement section 840, measured as indicated in Figure 170, is about 21 mm, i.e., between 19mm and 23mm.

[0129] The length of the restriction section 830, measured as indicated in Figure 17D, is about 28,5mm, i.e., between 27mm and 30mm.

[0130] It may sometimes be desired to rotationally lock or hold the hub 300 in position, e.g., when mounting cutting blades or servicing the equipment 100. For this purpose, the distance between the embossments 740 formed on the hub face 310 can be configured such that a socket wrench adapted to mate with the center bolt head 465 or some other tool can fit between them. Figure 18 schematically illustrates an example geometry where a socket wrench tool 1800 is inserted between the embossments 740. One socket wrench can be used to hold the hub 300 in position on one side while another socket wrench is used to tighten the bolt head 465 from the other side of the hub 300.

[0131] It is appreciated that the general axial height variation formed in the central part of the hub face, i.e., the part of the hub face which is adapted to mate with the corresponding inverted axial height variation 450, 455 formed on the face of the flange 410, can have a shape adapted to mate with a tool, such as a hexagonal shape adapted to mate with a socket wrench tool.

[0132] A flange 410 and / or a hub part can be provided in a kit of parts together with a socket wrench adapted to fit in the axial height variation of the hub. Thus, there is disclosed a kit of parts comprising a mounting arrangement 400, 900 as discussed herein and a tool, such as a socket wrench or the like. The tool is adapted to mate with an axial height variation 740 formed in the hub face 310, 710 of the hub 300 of the mounting arrangement.

[0133] It is also possible to form a hexagonal, a square or other non-circular depression in the flange 410 adapted to mate with a tool such as a socket wrench or the like, such that the flange can be rotationally locked when tightening the center bolt 460 by the bolt head 465 from the opposite side. This makes it easy to assemble the abrasive cutting implement 130 in a method where the hub 300 is first assembled on the blade support arm 140, then the two blades are assembled on the hub 300 using the restriction sections 830 as discussed herein. The two flanges 410 are finally mounted onto the assembly to secure the abrasive cutting implement 130. The two flanges 410 are assembled by guiding the center bolt 460 through the assembly, as shown in Figure 9 and in Figure 19. Note that, optionally, one of the flanges 410 can support the center bolt 460 while the other flange has a threaded center hole 940 that is adapted to mate with the threads of the center bolt 460, as shown in Figure 9 and in Figure 19. The flange 410 with the threaded center hole 940 preferably comprises a non-circular depression formed around the center hole which is shaped to mate with a tool such as a socket wrench, in which case the non-circular depression is of hexagonal shape. A square shaped or other non-circular depression is of course an option. This way a first tool such as a first socket wrench can be used to tighten the center bolt 460 while a second tool such as a second socket wrench is used to prevent rotation by the flange on the other side.

[0134] Alignment markers can be arranged on the different parts of the cutting blade assembly in order to simplify mounting of a cutting blade onto the equipment 100. To align the flange 410 with the cutting blade 110 and the hub face 310, at least one flange alignment marker 920 can be configured on the flange 410, as shown in Figure 9 and in Figure 19. This flange alignment marker 920 should be aligned with the blade alignment marker 750 formed on the hub face and also with the blade alignment marker 930 formed on the cutting blade 110, as shown in Figure 9 and in Figure 19. The alignment markers 750, 920, 930 simplify assembly at least in that they simplify alignment between the recess 730 and the matching protrusion 910 formed on the flange 410. The blade alignment markers 750, 930 of course also simplify alignment between the abrasive cutting blade 110 and the hub 300.

Claims

CLAIMS1. An abrasive cutting blade (110, 800, 1500, 1700) for processing concrete and stone,the cutting blade comprising abrasive cutting segments (115) arranged around a periphery (810) of the cutting blade,where an axis of rotation (R) of the cutting blade in use extends through a central aperture (430) of the cutting blade having a nominal radius (r2), where the central aperture (430) is at least partly circular (820) with a nominal radius (r2),where an axial depression (420) is formed in the cutting blade (800) around the central aperture (430),the axial depression (420) comprising an annular part (1510) that extends at an angle (a) relative to an extension plane (P) of the cutting blade to form an engagement surface arranged to engage a flange (410) on one side of the cutting blade and a radially outer part (340) of a hub face (310) of a center hub (300) on the other side of the cutting blade,where the central aperture (430) is enlarged (r3) relative to the nominal radius (r2) along at least one enlargement section (840) of the central aperture (430).

2. The abrasive cutting blade (110, 800, 1500, 1700) according to claim 1 , where the annular part (1510) of the axial depression (420) has an outer diameter (D3) between 79mm and 99mm, and preferably about 89mm.

3. The abrasive cutting blade (110, 800, 1500, 1700) according to claim 1 or 2, where the annular part (1510) of the axial depression (420) has an inner diameter (D2) between 62mm and 82mm, and preferably about 72mm.

4. The abrasive cutting blade (800) according to any previous claim, where the nominal radius (r2) is between 33mm-37mm, and preferably about 35mm.

5. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where the angle (a) between the annular part (1510) and theextension plane (P) of the cutting blade is between 22° and 26°, and preferably about 24°.

6. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where the axial depression (420) comprises an inner portion (1520) radially inwards from the annular part (1510), which inner portion (1520) extends parallel to the extension plane (P) of the cutting blade.

7. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where a depth (1710) of the axial depression (420) measured along the axis of rotation (R) is between 1,7mm and 3,7mm, and preferably about 2,7mm.

8. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where the central aperture (430) is restricted (r1) relative to the nominal radius (r2) along at least one restriction section (830) of the central aperture (430).

9. The abrasive cutting blade (110, 800, 1500, 1700) according to claim 8, where the restriction section (830) is a circular segment of the central aperture (420) having a radius (r1) smaller than the nominal radius (r2).

10. The abrasive cutting blade (110, 800, 1500, 1700) according to any of claims 9-10, comprising two restriction sections (830) mirrored from each other with respect to the axis of rotation (R).

11. The abrasive cutting blade (110, 800, 1500, 1700) according to any of claims 9-10, where a distance measured from the axis of rotation (R) to the closest point along the restriction section (830) is between 30mm-36mm, and preferably about 33mm.

12. The abrasive cutting blade (110, 800, 1500, 1700) according to any of claims 9-11 , where a length measured across the restriction section (830) is between 27mm and 30mm, and preferably about 28,5mm.

13. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where the enlargement section (840) is configured to align witha recess (730) formed in the center hub (300) and to receive a matching axial protrusion (910) formed on the flange (410).

14. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where the enlargement section (840) is a circular segment of the central aperture (420) having a radius (r3) larger than the nominal radius (r2).

15. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, comprising two enlargement sections (840) mirrored from each other with respect to the axis of rotation (R).

16. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where a distance measured from the axis of rotation (R) to the most distant point along the enlargement section (840) is between 34mm-40mm, and preferably about 37mm.

17. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where a length measured across the enlargement section (840) is between 27mm and 30mm, and preferably about 28,5mm.

18. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where the abrasive cutting segments (115) comprise diamond abrasive cutting segments.

19. The abrasive cutting blade (800) according to any previous claim, comprising blade alignment markers (850) formed in connection to the central aperture (420).

20. The abrasive cutting blade (800) according to any previous claim, comprising a blade rotation direction marker (860).

21. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where an outer diameter (D5) of the cutting blade is between 200mm and 240mm, and preferably about 218mm.

22. The abrasive cutting blade (110, 800, 1500, 1700) according to any previous claim, where a tangential spacing between the abrasive cutting segments (115) is between 2mm and 4mm, and preferably about 3mm.

23. Construction equipment (100, 1400) comprising the abrasive cutting blade according to any of the previous claims.

24. An abrasive cutting blade (800) for processing concrete and stone, the cutting blade (800) comprising abrasive cutting segments (115) arranged around a periphery (810) of the cutting blade (110, 800),where an intended axis of rotation (R) of the cutting blade (800) extends through a central aperture (430) of the cutting blade (800),where an axial depression (420) is formed in the cutting blade (800) around the central aperture (430),where the central aperture (430) is partly circular (820) with a nominal radius (r2),where the central aperture (430) is restricted (r1) relative to the nominal radius (r2) along at least one restriction section (830) of the aperture,where the central aperture (430) is enlarged (r3) relative to the nominal radius (r2) along at least one enlargement section (840) of the aperture.

25. Construction equipment (100, 1400) comprising an elongated blade support arm (140), where a hub (300) is rotatably mounted at a distal end (145) of the blade support arm (140), to rotate about an axis of rotation (R), where a radially outer and axially central peripheral surface of the hub (300) defines a pulley arranged to engage a drive belt,the hub (300) comprising hub faces (310) that extend orthogonally to the axis of rotation (R) on both sides of the pulley,where each hub face (310) comprises a radially outer part (340) arranged to engage an axial depression (420) formed around a central aperture (430) of a respective abrasive cutting blade (110, 800, 1500, 1700),where each hub face (310) is arranged to cooperate with a flange (410) on an opposite side of the respective abrasive cutting blade (110, 800, 1500, 1700) to removably hold the abrasive cutting blade in position relative to the hub (300).

26. The construction equipment (100, 1400) according to claim 25, where the support arm (140) comprises an axle at the distal end (145) that extends along the axis of rotation (R), where a bearing (1410) is arranged between the hub (300) and the axle.

27. The construction equipment (100, 1400) according to claim 25 or 26, where the hub (300) comprises at least one axially extending throughhole configured to cooperate with a respective fastening member (460) arranged to impart opposing axial forces on the flanges (410).

28. The construction equipment (100, 1400) according to claim 27, where each hub face (300) is arranged to engage its respective abrasive cutting blade along an annular engagement surface that extends between an inner diameter (D2) and an outer diameter (D3), where an outer diameter of the bearing (1410) is smaller than or equal to the inner diameter (D2) of the annular engagement surface.

29. The construction equipment (100, 1400) according to any of claims 25- 28, where the parallel and axially separated dual abrasive cutting blades (110, 800, 1500, 1700) extend along respective cutting blade planes (P1, P2) flush with the elongated blade support arm (140).

30. The construction equipment (100, 1400) according to any of claims 25- 29, where the elongated blade support arm (140) comprises an inner blade cover (170), separated from the parallel and axially separated dual abrasive cutting blades (110, 800, 1500, 1700) in an extension direction of the support arm (140), and extending along a segment of the cutting blades, where the inner blade cover (170) is flush with the abrasive cutting blades.

31. The construction equipment (100, 1400) according to any of claims 25- 30, where the elongated blade support arm (140) comprises an outer blade cover (180), arranged radially outwards from the inner blade cover (170), where the outer blade cover (180) is arranged to pivot (175) about a pivot point (171) removed from the parallel and axially separated dual abrasive cutting blades (110, 800, 1500, 1700) in the extension direction of the support arm (140).

32. The construction equipment (100, 1400) according to any of claims 25-31 , where the support arm (140) and the parallel and axially separated dual abrasive cutting blades (110, 800, 1500, 1700) forms a cutting implement arranged to penetrate into a stone or concrete work object (101).

33. An abrasive cutting blade (110, 800, 1500, 1700) for processing concrete and stone,the cutting blade comprising abrasive cutting segments (115) arranged around a periphery (810) of the cutting blade,where an axis of rotation (R) of the cutting blade in use extends through a central aperture (430),where the central aperture (430) is at least partly circular (820) with a nominal radius (r2),where an axial depression (420) is formed in the cutting blade (800) around the central aperture (430),the axial depression (420) comprising an annular part (1510) that extends at an angle (a) relative to an extension plane (P) of the cutting blade to form an engagement surface arranged to engage a flange (410) on one side of the cutting blade and a radially outer part (340) of a hub face (310) of a center hub (300) on the other side of the cutting blade,where the angle (a) between the annular part (1510) and the extension plane (P) of the cutting blade is between 22° and 26°, and preferably about 24°.

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