Saw blade

Abstract

The invention relates to a saw blade, in particular a saber saw blade, for a hand-held power tool, having a saw blade section with a cutting edge and an opposite saw blade back, in particular with a cutting edge defined by a plurality of saw teeth, the saw blade furthermore having a clamping shank which is provided for being received by a chuck of the hand-held power tool and has a lower edge and an opposite upper edge, wherein a transition region is configured between the clamping shank and the saw blade section, in which transition region a difference in spacing between a spacing (A E ) between the lower edge and the upper edge of the clamping shank and a spacing (A B ) between the cutting edge and the saw blade back is overcome. It is proposed that a transition region lower edge between the lower edge of the clamping shank and the cutting edge has a heightening, in particular a stress-relieving heightening.

Description

Technical Field

[0001] The present invention relates to a saw blade and a handheld machine tool having such a saw blade. Background Technology

[0002] To date, saw blades such as the "Bosch S1122VFR Special for Pallet Repair" are examples of this type of saw blade. They sell under the name ")" (see also: Figure 5 —Saw blades according to existing technology), and for example, used for repairing wooden pallets, such as European pallets. In this application, especially when separating the middle plank of a wooden pallet, the lateral accessibility of the middle plank is obstructed by the adjacent plank, and the saw blade must be strongly bent during sawing, thus experiencing a high bending load (Biegebeanspruchung) transverse to the clamping face or wide side of the saw blade. The dimensions of the hand-held machine tool interface for the saw blade, especially the commonly used chuck, particularly the toolless commonly used chuck (SDS quick-change self-locking chuck) for saber saws, and the dimensions of the clamping shank of the saw blade that matches the chuck, have remained unchanged for many years and especially cannot be changed without incompatibility with older equipment, especially not by widening the clamping shank width. The clamping shank of the saw blade here reaches its load limit and a way must be found to meet the increased requirements without making significant changes to the interface.

[0003] A known approach to meeting the improved requirements without significantly altering the machine interface, particularly the chuck and / or clamping shank, is to sandblast the clamping shank and / or the transition area to the saw blade section. Sandblasting homogenizes and refines the surface roughness. This counteracts breakage under cyclic loading, especially in the case of micro-dentation, and thus significantly increases saw blade life without shank breakage and / or saw blade breakage. However, this necessitates additional manufacturing steps, leading to increased costs. Summary of the Invention

[0004] This invention begins with a saw blade. The saw blade of this invention, and its meaningful extensions, can reduce manufacturing costs and / or increase blade life without shank breakage and / or blade breakage. The combined effect of reduced manufacturing costs and increased lifespan constitutes a particular advantage of this invention.

[0005] Therefore, the present invention starts with a saw blade for a handheld machine tool, particularly a saber saw blade. The saw blade has a saw blade section having a cutting edge oriented particularly substantially along the longitudinal axis of the saw blade section and an opposing saw blade ridge. In particular, the cutting edge is defined or formed by a plurality of saw teeth. However, instead of saw teeth, the cutting edge can in principle be constructed as a blade edge, particularly constructed with straight saw teeth (Geradschliff) or wavy saw teeth (Wellenschliff), or otherwise constructed, making it particularly capable of cutting or sawing workpieces. The cutting edge and / or the different saw teeth that advantageously define the cutting edge can present a plurality of different shapes, profiles, and / or tooth or pitch patterns (Teilungsmuster), suitable for performing multiple cutting processes, including but not limited to cutting wood, metal, plastic, and / or other materials. Preferably, the saber saw blade is suitable for cutting wood and metal materials, particularly for pallet repair. Furthermore, the saw blade has a clamping shank configured to be received by the chuck of a handheld machine tool. The clamping shank has a lower edge and an opposing upper edge. Advantageously, the upper and lower edges are constructed substantially parallel to each other, at least in sections. The lower edge is arranged on the saw blade side of the cutting edge, and conversely, the upper edge is arranged on the saw blade side of the saw blade spine. A transition region is formed between the clamping shank and the saw blade section. This transition region overcomes the gap between the lower and upper edges of the clamping shank and the gap between the cutting edge and the saw blade spine and / or the substantially straight areas of the saw blade section parallel to and / or adjacent to the saw blade spine. It can be said to overcome the width difference between the width of the clamping shank and the width of the saw blade section. Therefore, the transition region adapts to the width of the clamping shank in the boundary region relative to the clamping shank and to the width of the saw blade spine / cutting edge in the boundary region relative to the saw blade section, or in the boundary region relative to the cutting edge and the saw blade spine.

[0006] This invention proposes that the lower edge of the transition region between the lower edge of the clamping shank and the cutting edge of the saw blade section has a raised portion, particularly a portion that increases unloading stress. Advantageously, this enables the improvement, particularly homogenization, of stress in the shank region and / or the transition region to the saw blade section. It can reduce stress peaks and / or fatigue fracture, especially originating from the lower edge of the transition region subjected to particularly strong tensile and bending loads. It can significantly improve the lifespan of saw blades, especially those subjected to cyclic reciprocating loads, particularly those subjected to bending loads transversely to the wide side or perpendicular to the saw blade plane. Tests show that this can significantly increase the number of cycles, resulting in a transverse displacement of the saw blade tip in the handheld machine tool, particularly by 50-100% compared to saw blades without the raised portion and / or by 10-50% compared to saw blades with a sandblasted shank and / or a sandblasted transition region. The saw blades according to the invention, especially pallet repair (reverse) saw blades, preferably have a significantly improved lifespan in pallet repair applications, and in particular, a lifespan that even significantly exceeds that of sandblasted saw blades. Furthermore, advantageously, despite measures to reduce stress through the heightening section, a stop is also provided, particularly for triggering several clamping locks when the saw blade is inserted into a handheld machine tool. This stop serves specifically as a chuck trigger stop for the chuck of a saber saw. This improves the reliable triggering of the chuck, or clamping lock, used for tensioning the saw blade. The so-called parking position of the SDS can be released or triggered via the raised section. Therefore, the longitudinal positioning of the saw blade in the clamping lock, or chuck, can be reliably guaranteed, particularly by means of a clamping pin in a hole at the clamping end of the SDS, to trigger the SDS and / or reliably clamp and lock it. This reduces the cost of manufacturing the saw blade, as additional production steps, such as those for sandblasting, are eliminated. Production time is also reduced. Advantageously, the raised section can be produced by stamping, allowing it to be generated during the manufacturing of the saw blade blank (without toothed edges).

[0007] This invention proposes that the augmenting portion be constructed as a raised arch, or in other words, convex, or protruding. The augmenting portion protrudes substantially transversely to the longitudinal axis of the clamping handle from the region adjacent to the lower edge of the transition area in the direction of the clamping handle's longitudinal axis. This augmenting portion protrudes beyond the imaginary extension of the lower edge of the clamping handle, i.e., the distance between the augmenting portion and the longitudinal axis of the clamping handle is greater than the distance between the lower edge and the longitudinal axis. The augmenting portion is located in, or protrudes beyond, the region adjacent to the lower edge of the transition area in the direction of the longitudinal axis. The augmenting portion can be said to protrude transversely to the longitudinal axis from or be separated from the region adjacent to it in the direction of the clamping handle's longitudinal axis. Along the longitudinal axis, on both sides of the augmenting portion, the segments of the lower edge of the transition area can be said to be arranged closer to the longitudinal axis or closer to the imaginary extension of the lower edge than the augmenting portion. The augmenting portion has a particularly rounded apex. The area of ​​the lower edge of the transition region between the raised portion and the cutting edge has a smaller distance relative to the longitudinal axis of the clamping shank than the distance between at least one area of ​​the raised portion and the longitudinal axis of the clamping shank. This area can be said to form a recess. Advantageously, this recess is constructed in a substantially basin-like shape. Advantageously, the distance relative to the longitudinal axis of the shank in the boundary region between the lower edge of the transition region and the cutting edge, or the distance between the first serration and the longitudinal axis of the clamping shank, is greater than at least one distance between the area of ​​the raised portion and the longitudinal axis of the clamping shank, especially the maximum distance between the raised portion and the longitudinal axis of the clamping shank.

[0008] This invention proposes that the heightening section be constructed so that it does not have straight sections, steps, and / or sharp edges in the longitudinal direction of the saw blade or clamping shank. This avoids stress peaks and allows for a more uniform stress distribution. It also prevents saw blade breakage, particularly in the clamping shank or transition area.

[0009] Furthermore, it is proposed that the lower edge of the transition region, especially its profile, is defined by a spline curve or polynomial curve along the longitudinal axis of the saw blade or clamping shank, particularly by a spline curve or polynomial curve defined by multiple points with continuous slope. This results in similar stress on both sides of the increased portion with respect to the longitudinal axis in the transition region, which can reduce the maximum stress in the transition region overall, particularly by 5-15%, and preferably by about 10%.

[0010] Furthermore, it is proposed that no raised portion be arranged on the upper edge in the transition region between the upper edge and the saw blade spine. This improves stress distribution in the transition region, especially in the case of saw blades with only one cutting edge, thus preventing saw blade breakage. However, in principle, a raised portion can also be arranged on the upper edge in the transition region, especially when the saw blade spine also has teeth; the raised portion is constructed in a manner similar to the raised portion on the lower edge of the transition region.

[0011] This invention proposes that the extension portion is not configured to be surrounded by a clamping lock, especially not in a form-locking manner. In this context, this should be understood as: the extension portion, on the side opposite to the clamping shank, is not configured with a blocking element or similar element for form-locking and / or obstruction, especially in the axial direction, from being clamped by the clamping lock. That is, the saw blade is not axially secured in the clamping lock and / or SDS of a handheld machine tool, especially a saw blade under tensile load, via or through this extension portion. The extension portion is not used to directly and axially secure the saw blade to the handheld machine tool to prevent it from falling out of the clamping lock. However, the clamping lock can, in principle, also laterally support the transition area on the wide side of the saw blade. Therefore, for example, in the case of a trestle blade, the T-shaped structure of the T-handle used according to standard, or the lateral elevation of the clamping shank, does not constitute the elevation according to the invention, especially because the T-shaped structure or lateral elevation is used for axial fixation to prevent the saw blade from falling off under tensile load, and furthermore, a portion of the clamping shank is received and overlapped by the clamping lock and therefore does not constitute part of the transition area. A straight, toothless section parallel to or offset from the extension of the cutting edge does not constitute the imagined elevation according to the invention, especially when viewed toward the first saw tooth, where the section protrudes from the shank due to the tooth root or groove of the shank.

[0012] Furthermore, it is proposed that the distance between the lower edge of the transition area and the opposite upper edge of the transition area or the longitudinal axis of the clamping shank is smaller on the clamping shank side of the raised section than on the saw blade section side of the raised section (viewed in the longitudinal axis direction of the clamping shank). The clamping shank side, or saw blade section side, should be understood as the side of the raised section facing the clamping shank or the side facing the saw blade section. This can also improve service life.

[0013] Furthermore, it is proposed that the distance between the extreme point of the lifting section and the rear side of the clamping shank, particularly in the longitudinal axis direction of the clamping shank or saw blade, is approximately 19-25 mm, especially 21-22 mm. This ensures reliable triggering of the stop position of the existing SDS system. In particular, the distance between the extreme point of the lifting section and the boundary area of ​​the transition region relative to the cutting edge is approximately 5-10 mm, especially 7-9 mm. This improves stress distribution in the transition region and prevents saw blade breakage.

[0014] Furthermore, it is proposed that, especially in the region of the extreme point of the raised section, or in the region of the apex of the raised section, the radius of the raised section is approximately 0.5-1.5 mm, particularly approximately 1.0 mm. This further simplifies the stamping process of the raised section.

[0015] Furthermore, it is proposed that the stress on the saw blade subjected to bending loads transversely to the blade plane is compensated in the areas of the upper and lower edges of the transition region, especially in the area where the clamping shank connects to the raised section in the longitudinal axis direction.

[0016] This invention proposes that the boundary points between the upper edge of the transition region and the spine of the saw blade, and the boundary points between the lower edge of the transition region and the cutting edge, are arranged axially staggered or axially aligned along the longitudinal axis of the saw blade or the clamping shank. This allows the saw blade to be matched to different requirements.

[0017] This invention proposes that the lower and upper edges of the transition region be constructed to be at least substantially non-symmetrical relative to each other, and in particular non-mirror symmetrical with respect to the longitudinal axis of the clamping shank. At least portions of the transition region and / or the clamping shank or saw blade section can be constructed by sandblasting. This allows the surfaces of these portions to be homogenized and refined in terms of roughness, sometimes further improving saw blade life.

[0018] This invention proposes that the heightening section be used as a triggering device for the clamping and / or closing mechanism of the chuck of a handheld machine tool, particularly for triggering the stop mechanism. This further improves user-friendliness. In particular, it improves the longitudinal positioning of the saw blade in the clamping lock, especially when the saw blade is inserted into the clamping lock.

[0019] The present invention proposes that the distance between the upper edge of the transition region and the longitudinal axis of the clamping shank increases exponentially from the clamping shank to the spine of the saw blade, and / or the distance between the lower edge of the transition region and the longitudinal axis of the clamping shank increases exponentially from the recess between the raised portion and the cutting edge to the spine of the saw blade.

[0020] The present invention proposes that the lower edge of the transition region has a recess, particularly a substantially basin-shaped recess, between the raised portion and the cutting edge. Specifically, the distance between this recess and the longitudinal axis of the clamping shank is greater than the distance between the lower edge and the longitudinal axis and less than the distance between the raised portion and the longitudinal axis. Advantageously, the recess extends at more than 50%, particularly about 50-75%, of the lower edge of the transition region in the longitudinal direction of the clamping shank, and / or extends with a serration width many times the width of the serration, and / or extends at about 10-50% of the longitudinal extension of the lower edge.

[0021] Furthermore, the present invention also claims protection for handheld machine tools having the above-mentioned saw blade, especially reciprocating saws, preferably saber saws. Attached Figure Description

[0022] Other advantages are apparent from the following description of the accompanying drawings. Embodiments of the invention are illustrated in the drawings. The drawings, description, and claims encompass multiple combinations of features. Those skilled in the art will also find it appropriate to consider the stated features individually and combine them into other meaningful combinations.

[0023] The attached diagram shows:

[0024] Figure 1 A schematic side view of a saw blade according to the present invention.

[0025] Figure 2 Figure 1 A partial schematic diagram of the saw blade according to the present invention.

[0026] Figure 3 Figure 1 The saw blade according to the present invention Figure 2 Another partial schematic diagram,

[0027] Figure 4 A chart used to compare repeated bending tests with different saw blades until the shank breaks.

[0028] Figure 5 Based on existing technology, this saw blade has been sold to date under the name "Bosch S1122VFR saber saw blade for pallet repair". Detailed Implementation

[0029] Figure 1 A saw blade 10 for a handheld machine tool (not shown) according to the invention is shown. The saw blade 10 is a saber saw blade 12, configured for use with a saber saw (not shown). The saber saw blade 12 is particularly configured for repairing wooden pallets, etc. The clamping shank 14 corresponds at least substantially to a common clamping shank 14 for saber saw blades, such as, for example, the "Bosch S 1122VFR Special for Pallet Repair" saber saw blade to date. (See) Figure 5 As is widely known elsewhere, the shape and / or configuration of the clamping shank 14 can vary in principle to accommodate multiple chucks. The clamping shank allows the saw blade 10 to be secured to a chuck or clamping lock (not shown), particularly to the SDS of a reciprocating saw, especially a saber saw. The saw blade 10 has a saw blade section 16 having a cutting edge 18, or front edge or working edge. The cutting edge 18 has a plurality of teeth 22. The cutting edge 18 and / or the teeth 22 defining the cutting edge 18 herein can present a variety of different shapes, profiles, and / or tooth patterns or pitch patterns suitable for performing multiple cutting processes, including but not limited to cutting wood, metal, plastic, and / or other materials. Particularly preferred, the saber saw blade 12 is suitable for cutting wood and metal materials, especially for pallet repair. The clamping shank 14, the transition area 38, and the saw blade section 16 are advantageously constructed or formed integrally, however, they can be designed, constructed, or formed in many different known or yet unknown types.

[0030] Opposite to the cutting edge 18, the saw blade section 16 has a saw blade ridge 20, or rear edge or non-cutting edge. This saw blade ridge, or rear edge or non-cutting edge, is arranged relative to the cutting edge 18 at a defined, particularly constant, spacing. However, in principle, the shape and configuration of the saw blade ridge 20 can vary; for example, the saw blade ridge 20 can also be constructed as a cutting edge, which can be constructed at an angle to the cutting edge, wavy, and / or with a varying spacing from the cutting edge, or similar configurations. Figure 1 The cutting edge 18 and the saw blade spine 20 are oriented substantially along or parallel to the longitudinal axis 24 of the saw blade section 16, that is, specifically parallel to each other. The saw blade section 16 ends at a tip 26 on the front side. The tip 26 may also take on several known or unknown shapes.

[0031] In particular, the saw blade 10 is constructed to be relatively flexible and therefore has a small blade thickness, which is at most 1.3 mm, particularly 0.7-1.1 mm, and preferably about 0.9 mm. This blade thickness advantageously corresponds to the thickness of the clamping shank 14, the transition region 38, and the saw blade section 16. In particular, the cutting edge 18 has, for example, teeth through the saw teeth 22. Or a similar structure forming a cutting edge width, the cutting edge width being at most 1.7 mm, particularly 1.1-1.5 mm, preferably about 1.3-1.4 mm. Therefore, advantageously, the saw blade section 16, the transition region 38, and the clamping shank 14 are constructed to the same thickness. Thus, compared to saber saw blades used for other purposes, the saw blade 10 is constructed to be relatively thin, making the saw blade 10 relatively flexible, or bendable transversely to the wide side 28 of the saw blade 10, or transversely to the saw blade plane (not shown), which unfolds through the longitudinal axis 24 and the connecting axis 30, which extends transversely to the longitudinal axis 24 through the cutting edge 18 and the saw blade spine 20.

[0032] The clamping shank 14 is configured to be received by the chuck of a handheld machine tool. The clamping shank has a lower edge 34 and an opposing upper edge 36. The lower edge 34 is arranged on the saw blade side or front side of the cutting edge 18, and the upper edge 36 is arranged on the saw blade side or back side of the saw blade spine 20. A transition region 38 is formed between the clamping shank 14 and the saw blade section 16. Specifically, the distance between the lower edge 48 and the upper edge 50 of the transition region varies, particularly along the longitudinal axis 25 of the clamping shank 14 or the longitudinal axis 24 of the saw blade section 16. Therefore, especially in the absence of sharp corners, edges, and / or narrow radii, the distance difference between the distance 40 (e.g., between points H and J) between the lower edge and the upper edges 34, 36 of the clamping shank 14 and the distance 42 between the cutting edge 18 and the saw blade spine 20 can be overcome. The transition region 38 effectively overcomes the width difference between the clamping shank 14 and the saw blade section 16. The transition region 38 adapts to the width 40 of the clamping shank 14 on one hand, and to the width 42 of the saw blade section 16 on the other. This overcomes the width difference between the clamping shank 14 and the saw blade section 16. The opposing lower and upper edges 34, 36 of the clamping shank 14 are constructed, at least partially, substantially parallel to each other, particularly in the region between the transition region 38 and another transition region 44 transitioning to the protrusion 46 of the clamping shank 14. This allows the lower and upper edges to be positioned in the chuck with a relatively small gap. In addition to the protrusion 46, holes 32 are arranged on the clamping shank 14 in a known manner. The holes 32 are used in a known manner as positioning and / or clamping auxiliary structures for clamping bolts or clamping pins of clamping locks for hand-held machine tools. The protrusion 46 extends the lower edge 34 in a known manner so as to distribute the forces generated during sawing to a larger contact surface of the clamping lock, for example. In particular, the protrusion 46 or the upper edge 36 may also have a bevel, chamfer, or rounding to facilitate, for example, the insertion of the saw blade 10 into the clamping lock. The clamping shank 14 may also have other known or unknown configurations.

[0033] According to the invention, the lower edge 48 of the transition region has a raised portion 52, particularly a stress-relieving raised portion, between the lower edge 34 of the clamping shank 14 and the cutting edge 18 of the saw blade section 16. This raised portion is convex, or radially outwardly arched. It can be described as a protrusion. The raised portion 52 can be described as having a raised arch or a rounded shape. At least in the longitudinal axis direction 25 of the clamping shank 14, the raised portion protrudes on both sides beyond the imaginary extension line of the lower edge 34 and / or the adjacent region of the lower edge 48 of the transition region. The raised portion 52 can be described as protruding from or separated from the adjacent region in the longitudinal axis direction 25. The raised portion 52 has a particularly rounded apex. Particularly in the longitudinal axis direction 24 of the saw blade 10, or in the longitudinal axis directions 24, 25 of the saw blade section 16 or the clamping shank 14, the raised portion 52 does not have a particularly sharp edge. This avoids unwanted stress concentrations, especially bending stress concentrations in the transition region 38 or in the boundary region between the clamping shank 14 and the saw blade section 16 relative to the transition region 38.

[0034] The heightening section 52 is constructed along the longitudinal axis directions 24, 25 of the saw blade 10 or the clamping shank 14 such that it is at least substantially free of straight sections, steps, and / or sharp edges. This also avoids stress peaks in the transition region 38. When the saw blade 10 is subjected to a lateral bending load (transverse to the wide side 28), the stress distribution in the end section 54 of the saw blade 10, especially in the middle transition region 38, is substantially uniform and therefore of equal magnitude, particularly in the main portions of the upper and lower edges of the transition region.

[0035] Figure 3 Show Figure 2 A magnified view of region 62 in the image. Figure 2 Again Figure 1 A magnified view of region 64, by Figure 3It can be seen that the lower edge 48 of the transition region, especially its contour, is defined by a spline curve or polynomial curve 66 along the longitudinal axis direction 25 of the clamping handle 14. Multiple points B, C, D, E, and F define this polynomial curve 66, at which there is continuity of slope. Compared to points C, D, and E, points B and C, and points E and F, are arranged relatively close to each other at intervals. Thus, the lower edge 48 of the transition region forms a basin-shaped concave portion between points C, D, and E. Conversely, at points F and B of the lower edge 48 of the transition region, there is a relatively large slope relative to the longitudinal axis of the clamping handle 14. In the region of point G, the raised portion 52 constitutes an extreme point or vertex. The raised portion 52 has a radius of curvature R1. The contour 48 of the lower edge of the transition region finally transitions into the lower edge of the clamping handle 14 at point H with a radius R3. In contrast, the lower edge profile of this transition region transitions into the cutting edge 18 at point A, or rather, directly into the first or last serration 68 of the cutting edge 18. A radius R2 exists between points A and B. Compared to points C to H, points A and B have a larger spacing H relative to the longitudinal axis 25 of the clamping shank 14, or relative to the imaginary extension 70 of the lower edge 34 of the clamping shank 14 (which is constructed parallel to the longitudinal axis 25). A H B Point C, relative to the longitudinal axis 25 of the clamping shank 14, or the imaginary extension 70 of the lower edge 34, has a distance H greater than that of point G, which is the pole of the marked portion. G Slightly smaller spacing H C At least compared to point G of the raised section 52, points D, E, and F of the lower edge 48 in the transition region all have a smaller spacing H relative to the longitudinal axis 25 of the clamping handle 14, or the imaginary extension line 70 of the lower edge 34. D H E H F Point H is located on the imaginary extension 70 of the lower edge 34, and therefore does not have a distance H from this imaginary extension. H Alternatively, it may have a minimum distance relative to the longitudinal axis 25 of the clamping handle 14.

[0036] Conversely, in see Figure 1 or Figure 2On the upper edge of the transition region, no raised portion is arranged between the upper edge 36 of the saw blade 10 and the saw blade spine 20. However, in principle, the raised portion can also be constructed in a shape similar to or similar to the raised portion 52 on the lower edge of the transition region (arched, convex), especially if the saw blade spine 20 of the saw blade 10 also has teeth, which can be advantageous. The raised portion 52 is not configured to be surrounded by a clamping lock, especially not by a shape-locking mechanism, as is known, for example, from the T-shaped shank of a barbed saw blade and its associated clamping lock. On the clamping shank side 100 of the raised portion 52, the lower edge 48 of the transition region and the opposite upper edge 50 of the transition region (see...) Figure 2 The minimum spacing A between ) U A O It is smaller than that on the saw blade section side 102 of the heightening section 52. The clamping shank side 100, or saw blade section side 102, should be understood as the side facing the clamping shank 14 or the saw blade section 16 in the longitudinal axis direction 25 of the clamping shank 14, starting from the heightening section 52. In particular, the distance 72 between the extreme point (point G) of the heightening section 52 and the rear side 74, or end side, of the clamping shank 14 is about 19-25 mm, especially 21-22 mm. In particular, the distance 76 between the extreme point (point G) of the heightening section 52 and the boundary point 78 (point A) of the transition area 38 relative to the cutting edge 18 is about 5-10 mm, especially 7-9 mm. In summary, the distance from the rear side 74 of the clamping shank 14 to the boundary point 78 (point A) is about 25-35 mm, especially about 30 mm. The distance 88 between the hole and the rear side 74 is approximately 11-11.5 mm. These dimensions may vary depending on the configuration of the saw blade 10, especially the configuration of the clamping shank, transition area, and saw blade section.

[0037] In the longitudinal axis directions 24, 25 of the saw blade 10 or the clamping shank 14, the boundary points 80, K, K' between the upper edges 50, 50' of the transition region and the saw blade spine 20, and the boundary points 78, A between the lower edge 48 of the transition region and the cutting edge 18, are axially staggered from each other. However, they can also be arranged approximately aligned axially (see dashed line 50" and boundary point K"). In this embodiment, the lower edge 48 and the upper edge 50 of the transition region are constructed to be at least substantially non-symmetrical with respect to each other, especially not mirror-symmetrical with respect to the longitudinal axis of the clamping shank 14. In principle, the transition region 38 can also be constructed by sandblasting or with other stability improvement measures.

[0038] Furthermore, the extension portion 52 serves as a triggering device for the clamping and / or closing mechanism of the chuck (not shown here), particularly for the SDS of a handheld machine tool. The side 82 of the extension portion 52 facing the clamping handle 14 is particularly capable of serving as a triggering device for the stop position mechanism of the SDS.

[0039] The distance between the upper edge 50 and the longitudinal axis 25 of the clamping shank 14 in the transition region increases exponentially from the clamping shank 14 to the saw blade spine 20. This distance increases by approximately 2.5 mm up to the saw blade spine. Similarly, the distance between the lower edge 48 in the transition region increases exponentially from the recess 84 between the raised portion 52 and the cutting edge 18.

[0040] The lower edge 48 of the transition region has a recess 84 between the raised portion 52 and the cutting edge 18. This lower edge of the transition region is substantially basin-shaped, particularly between points C, D, and E. Specifically, the distance between the recess 84 and the longitudinal axis 25 of the clamping handle 14 is greater than the distance between the lower edge 34 and the longitudinal axis 25 of the clamping handle 14, but less than the distance between the raised portion 52 and the longitudinal axis 25. Figure 3 Only the spacing of the extension line 70 relative to the lower edge 34 is shown, but this extension line extends parallel to the longitudinal axis 25. The recess extends in the longitudinal axial direction 25 of the clamping shank at more than 50% of the lower edge 48 in the transition region, particularly at about 50-75%, and / or extends a plurality of tooth pitch widths P of the serrations 22 and / or at about 10-50% of the longitudinal extension 86 of the lower edge 34. Advantageously, the spacing H... G The spacing is approximately 1-1.5 mm, especially approximately 1.1-1.25 mm, with a distance H. F The spacing is approximately 0.9-1mm, with a distance H. E The spacing is approximately 0.4-0.5 mm, with a distance H. D The spacing is approximately 0.3-0.4 mm, with a distance H. C For approximately 1.1-1.2 mm and / or spacing H B The thickness is approximately 1.7-2.0 mm. The angle 90 of the clamping shank 14 relative to the longitudinal axis of the saw blade section is approximately 3°. However, the spacing H... A -H G The shank angle can be varied. For example, the shank angle can be considered as 0-10°.

[0041] Figure 4The results of tests conducted with different saw blades used for pallet repair are shown. The vertical axis plots the relative number of cycles at which the saw blade tip, clamped in the hand-held tool, has shifted laterally across the saw blade plane until shank breakage occurs. The horizontal axis plots, on the left, the number of cycles for a comparison saber saw blade without a riser and without sandblasting, 92, after which shank breakage occurs. The middle plot shows the results based on the comparison saw blade (e.g., in...). Figure 5 The saw blade shown (within illustration) has a cycle count of 94, after which the shank and transition regions are sandblasted, and shank breakage occurs. Cycle count 96 is drawn on the right side, after which shank breakage occurs in the case of the saw blade 10 according to the invention (which has the heightening portion 52 according to the invention). This indicates that the saw blade 10 according to the invention preferably has a significantly improved lifespan in pallet repair applications, particularly a lifespan that can even significantly exceed that of sandblasted saw blades according to the prior art.

Claims

1. A saw blade (10) for a handheld machine tool, the saw blade having: The saw blade section (16) has a cutting edge (18) and an opposing saw blade spine (20). A clamping shank (14), the clamping shank being configured to be received by the chuck of the handheld machine tool and having a lower edge (34) and an opposing upper edge (36), wherein, A transition region (38) is formed between the clamping shank (14) and the saw blade section (16), in which the gap (A) between the lower edge and the upper edge (34, 36) of the clamping shank (14) is overcome. E ) and the distance (A) between the cutting edge (18) and the saw blade spine (20). B The difference in spacing between ) The feature is that the lower edge (48) of the transition region between the lower edge (34) of the clamping shank (14) and the cutting edge (18) of the saw blade section (16) has a raised portion (52), wherein the raised portion (52) is configured not to have straight sections, steps and / or sharp edges in the longitudinal axis direction of the saw blade (10) or in the longitudinal axis direction (24, 25) of the clamping shank (14), wherein the raised portion (52) serves as a triggering device for the clamping and / or closing mechanism of the chuck.

2. The saw blade (10) according to claim 1, characterized in that, The raised portion (52) is convex or is constructed as a protrusion.

3. The saw blade (10) according to claim 1 or 2, characterized in that, At least some portions of the lower edge (48) of the transition region are defined by a spline curve or a polynomial curve (66).

4. The saw blade (10) according to claim 1 or 2, characterized in that, No heightening portion is arranged on the upper edge (50) in the transition area between the upper edge (36) and the saw blade spine (20) of the saw blade (10).

5. The saw blade (10) according to claim 1 or 2, characterized in that, The heightening part (52) is not configured to be surrounded by a clamping lock.

6. The saw blade (10) according to claim 4, characterized in that, The distance (A) between the lower edge (48) of the transition region and the upper edge (50) of the opposite transition region. E A O The clamping handle side (100) of the heightening part (52) is smaller than the saw blade section side (102) of the heightening part (52).

7. The saw blade (10) according to any one of claims 1, 2 and 6, characterized in that, The distance (72) between the pole (G) of the heightening part (52) and the rear side (74) of the clamping handle (14) is 19-25 mm, and / or, The distance (76) between the pole (G) of the heightening part (52) and the boundary point or boundary region (78) of the transition region (38) relative to the cutting edge (18) is 5-10 mm.

8. The saw blade (10) according to any one of claims 1, 2 and 6, characterized in that, The radius (R1) of the heightening part (52) is 0.5-1.5 mm.

9. The saw blade (10) according to claim 4, characterized in that, In the transition region (38), the stress of the saw blade (10) subjected to bending load transversely to the plane of the saw blade is compensated.

10. The saw blade (10) according to claim 4, characterized in that, The boundary point (80) between the upper edge (50) of the transition region and the spine (20) of the saw blade, and the boundary point (78) between the lower edge (48) of the transition region and the cutting edge (20) are arranged axially staggered or axially aligned in the longitudinal axis direction (24) of the saw blade (10) or in the longitudinal axis direction (25) of the clamping shank (14).

11. The saw blade (10) according to claim 4, characterized in that, The lower edge (48) and the upper edge (50) of the transition region are essentially not symmetrical.

12. The saw blade (10) according to any one of claims 1, 2, 6, 9 to 11, characterized in that, The heightening part (52) serves as a triggering device for the clamping and / or closing mechanism of the SDS of the handheld machine tool.

13. The saw blade (10) according to claim 4, characterized in that, The distance between the upper edge (50) of the transition region and the longitudinal axis (25) of the clamping shank (14) increases from the clamping shank (14) to the saw blade spine (20), and / or, The distance between the lower edge (48) of the transition region and the longitudinal axis (25) of the clamping handle (14) increases from the recess (84) between the raised portion (52) and the cutting edge (20).

14. The saw blade (10) according to any one of claims 1, 2, 6, 9 to 11, 13, characterized in that, The lower edge (48) of the transition region has a recess (84) between the raised portion (52) and the cut edge (20).

15. The saw blade (10) according to claim 1, characterized in that, The saw blade (10) is a saber saw blade (12).

16. The saw blade (10) according to claim 14, characterized in that, The cut edge (18) is defined by a plurality of serrations (22).

17. The saw blade (10) according to claim 1, characterized in that, The heightening section (52) is a stress-unloading heightening section.

18. The saw blade (10) according to claim 3, characterized in that, The spline curve or polynomial curve (66) is defined by a plurality of points (B, C, D, E, F) on which there is slope continuity.

19. The saw blade (10) according to claim 5, characterized in that, The heightening portion (52) is configured to be not surrounded by the clamping lock shape lock.

20. The saw blade (10) according to claim 7, characterized in that, The distance (72) between the pole (G) of the heightening part (52) and the rear side (74) of the clamping handle (14) is 21-22 mm, and / or, The distance (76) between the pole (G) of the heightening part (52) and the boundary point or boundary region (78) of the transition region (38) relative to the cutting edge (18) is 7-9 mm.

21. The saw blade (10) according to claim 8, characterized in that, The radius (R1) of the heightening part (52) is 1.0 mm.

22. The saw blade (10) according to claim 8, characterized in that, The radius (R1) of the heightening part (52) is 0.5-1.5 mm in the region of the heightening part (52) adjacent to the pole or vertex.

23. The saw blade (10) according to claim 21 or 22, characterized in that, The radius (R1) of the heightening part (52) is 1.0 mm in the region of the heightening part (52) adjacent to the pole or vertex.

24. The saw blade (10) according to claim 9, characterized in that, In the region of the upper edge (50) and the lower edge (48) of the transition region, the stress of the saw blade (10) subjected to bending load transversely to the plane of the saw blade is compensated.

25. The saw blade (10) according to claim 9, characterized in that, In the region where the clamping shank (14) is connected to the heightening part (52) in the longitudinal axis direction (25), the stress of the saw blade (10) subjected to bending load transversely to the plane of the saw blade is compensated.

26. The saw blade (10) according to claim 11, characterized in that, The lower edge (48) and the upper edge (50) of the transition region do not have mirror symmetry with respect to the longitudinal axis (25) of the clamping handle (14).

27. The saw blade (10) according to claim 12, characterized in that, The heightening part (52) serves as a triggering device for the clamping and / or closing mechanism of the SDS of the handheld machine tool, and is used to trigger the stop position mechanism.

28. The saw blade (10) according to claim 13, characterized in that, The distance between the upper edge (50) of the transition region and the longitudinal axis (25) of the clamping shank (14) increases exponentially from the clamping shank (14) to the saw blade spine (20), and / or, The distance between the lower edge (48) of the transition region and the longitudinal axis (25) of the clamping handle (14) increases exponentially from the recess (84) between the raised portion (52) and the cutting edge (20).

29. The saw blade (10) according to claim 14, characterized in that, The lower edge (48) of the transition region has a substantially basin-shaped recess (84).

30. The saw blade (10) according to claim 14, characterized in that, The distance between the recess and the longitudinal axis (25) of the clamping handle (14) is greater than the distance between the lower edge (34) and the longitudinal axis (25) and less than the distance between the raised portion (52) and the longitudinal axis (25).

31. The saw blade (10) according to claim 16, characterized in that, The recess (84) extends along the longitudinal axis direction (25) at more than 50% of the lower edge (48) of the transition region and / or extends at multiple pitch widths (P) of the serrations (22) and / or at 10-50% of the longitudinal extension of the lower edge (34).

32. The saw blade (10) according to claim 31, characterized in that, The recess (84) extends more than 50-75% of the lower edge (48) of the transition region along the longitudinal axis direction (25).

33. A handheld machine tool having a saw blade (10) according to any one of the preceding claims.

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