Saw blade

Abstract

The invention relates to a saw blade (100), in particular a reciprocating saw blade, comprising a base plate (111) which comprises a cutting edge (110) having a plurality of cutting teeth (119), a fastening section (113) for fastening to a hand-held power tool being arranged on the base plate (111), the cutting edge (110), starting from the fastening section (113) along a longitudinal axis (199) of the substrate (111), comprises a first region (102) having a first cutting edge section (132), a second region (103) adjoining the first region (102) and having a second cutting edge section (133), and a third region (104) adjoining the second region (103) and having a third cutting edge section (134), and a fourth region (105) adjoining the third region (104) and having a fourth cutting edge section (135), the first and fourth cutting edge sections (132, 135) being oriented parallel to the longitudinal axis (199), the second cutting edge section (133) being concavely curved, and wherein the second cutting edge section (133) is concavely curved. The third cutting edge section (134) is arranged at a predetermined angle (163) to the fourth cutting edge section (135).

Description

Technical Field

[0001] The present invention relates to a saw blade, particularly a reciprocating saw blade, such as a bar saw or saber saw blade, having a base plate including a cutting edge having a plurality of cutting teeth, wherein a fixing section for fixing to a handheld machine tool is arranged on the base plate, and wherein the cutting edge includes, along the longitudinal axis of the base plate from the fixing section, a first region having a first cutting edge section, a second region adjacent to the first region having a second cutting edge section, and a third region adjacent to the second region having a third cutting edge section. Background Technology

[0002] A saw blade with three regions is known from DE 10 2013 204 372 B4. Each of these three regions has an associated cutting edge segment. Two regions have straight cutting edge segments, while a region located between the two straight regions has a concave, curved cutting edge segment. Summary of the Invention

[0003] This invention relates to a saw blade, particularly a reciprocating saw blade, having a substrate comprising a cutting edge having a plurality of cutting teeth, wherein a fixing section for fixing to a handheld machine tool is arranged on the substrate. The cutting edge, along the longitudinal axis of the substrate, from the fixing section, includes a first region having a first cutting edge section, a second region adjacent to the first region and having a second cutting edge section, a third region adjacent to the second region and having a third cutting edge section, and a fourth region adjacent to the third region and having a fourth cutting edge section. The first and fourth cutting edge sections are oriented parallel to the longitudinal axis. The second cutting edge section is concavely curved. The third and fourth cutting edge sections are arranged at a predetermined angle.

[0004] Therefore, the present invention can provide a saw blade in which the third region has a third cutting edge section arranged at a predetermined angle to the fourth cutting edge section, which can extend the application range of the saw blade to two different workpiece diameters, and can also improve the saw blade service life and cutting speed without negatively affecting the cutting performance at the original workpiece diameter.

[0005] Preferably, the pre-given angle is pre-given in such a way that the third cutting edge segment is not arranged tangentially to the second cutting edge segment.

[0006] Therefore, it is possible to easily and appropriately expand the application range of saw blades to enable their use on two workpieces with different diameters.

[0007] Preferably, the first cutting edge segment is arranged at a first distance perpendicular to the longitudinal axis, and the fourth cutting edge segment is arranged at a second distance perpendicular to the longitudinal axis, wherein the first distance is a first gap smaller than the second distance.

[0008] Therefore, it is possible to provide a simple and uncomplicated transition between the second and fourth regions.

[0009] The second cutting edge segment preferably has a highest point arranged toward the longitudinal axis, which is perpendicular to the longitudinal axis and spaced apart from the first cutting edge segment by a second distance.

[0010] This allows for the simple creation of concave, curved areas.

[0011] Preferably, the first spacing is equal to the second spacing.

[0012] Therefore, it is simple and uncomplicated to provide a suitable cutting edge with four zones.

[0013] According to one embodiment, the cutting blade has a high-speed steel (HSS) strip with a height perpendicular to the longitudinal axis.

[0014] Therefore, it is possible to provide saw blades that are both wear-resistant and flexible.

[0015] Preferably, at the highest point of the second cutting edge section, the height of the high-speed steel strip has an assigned minimum value. Preferably, in the fourth region, the height of the high-speed steel strip has an assigned maximum value.

[0016] Therefore, it is possible to provide low-cost and wear-resistant saw blades.

[0017] Preferably, the length of the second region is greater than the lengths of the first region and / or the third region and / or the fourth region.

[0018] Therefore, it is possible to achieve appropriate allocation of resources to each region in a simple way.

[0019] According to another embodiment, along the longitudinal axis of the substrate, a fifth region having a fifth cut edge segment with a concave bend is adjacent to the fourth region, and a sixth region having a sixth cut edge segment oriented parallel to the longitudinal axis is also adjacent to the fifth region.

[0020] Therefore, an alternative saw blade can be provided simply and uncomplicatedly, which improves upon the workpiece diameter without negatively impacting the cutting performance at the corresponding original workpiece diameter.

[0021] Furthermore, the present invention also relates to a handheld machine tool, particularly a reciprocating saw, preferably a barbed saw or a scissor saw, having a saw blade according to the invention.

[0022] Therefore, the present invention can provide a handheld machine tool having a saw blade having a third cutting edge section arranged at a predetermined angle to a fourth cutting edge section in a third region, which can extend the use range of the saw blade to two different workpiece diameters and also improve the service life of the saw blade without negatively affecting the cutting performance at the original workpiece diameter. Attached Figure Description

[0023] The invention will be described in more detail below with reference to the embodiments shown in the accompanying drawings. The drawings show: Figure 1 Side view of a saw blade according to the present invention; Figure 2 : Figure 1 A magnified view of the cutting edge of the saw blade; Figure 3 : Figure 1 and Figure 2 A top view of the saw blade with the cutting teeth attached to the cutting edge; Figure 4 : Figures 1 to 3 A cross-sectional view of the saw blade; Figure 5 : Figures 1 to 4 A side view of the saw blade and the workpiece having a first diameter; Figure 6 : Figures 1 to 4 A side view of the saw blade and the workpiece having a second diameter; Figure 7 : A side view of another saw blade according to the present invention.

[0024] In the accompanying drawings, elements with the same or similar functions are given the same reference numerals and are described in detail only once. Detailed Implementation

[0025] Figure 1 A saw blade 100 for a handheld machine tool is shown. Preferably, the saw blade 100 is configured as a reciprocating saw blade for reciprocating saws, and advantageously for use as a saber saw or a trestle saw.

[0026] The saw blade 100 has a base plate 111 and a fixing section 113 disposed on the base plate 111. Preferably, the base plate 111 and the fixing section 113 are integrally constructed. The fixing section 113 is configured to fix the saw blade 100 to a handheld machine tool. Here, the fixing section 113 preferably forms a region 101 having a length 121. Furthermore, the fixing section 113 is preferably arranged at an angle 198 to the longitudinal axis 199 of the base plate 111. According to one embodiment, the angle 198 has 3°-5°.

[0027] In addition, the substrate 111 also includes a cutting edge 110 having a plurality of cutting teeth 119. The cutting edge 110 is arranged on the substrate 111 opposite to the saw blade back 112 of the saw blade 100. Illustrated, the saw blade back 112 is arranged parallel to the longitudinal axis 199. Alternatively, the saw blade back 112 may also be arranged at a predetermined angle to the longitudinal axis 199.

[0028] The cutting edge 110 has first, second, third, and fourth regions 102, 103, 104, and 105 along the longitudinal axis 199 of the substrate 111, or along arrow 109, starting from the fixed section 113. Each region 102-105 is associated with a cutting edge section 132, 133, 134, and 135. Thus, the cutting edge 110 has a first cutting edge section 132 associated with the first region 102, a second region 103 adjacent to the first region 102 and having a second cutting edge section 133, a third region 104 adjacent to the second region 103 and having a third cutting edge section 134, and a fourth region 105 adjacent to the third region 104 and having a fourth cutting edge section 135. The first cutting edge section 132 and the fourth cutting edge section 135 are preferably oriented parallel to the longitudinal axis 199. Here, when the saw blade back 112 is oriented parallel to the longitudinal axis 199, the first and fourth cutting edge sections 132 and 135 are also arranged parallel to the saw blade back 112. Furthermore, the second cutting edge section 133 is preferably concavely curved. Preferably, the second cutting edge section 133 is constructed with a concave or arcuate curve towards the longitudinal axis 199. Here, the second cutting edge section 133 has a consistent constant radius of curvature R1. Alternatively, the second cutting edge section 133 may also have a varying radius of curvature R1 and be curved, for example, parabolically.

[0029] Preferably, during saw blade manufacturing, the bending of the second cutting edge segment 133 can occur simultaneously with the machining of the cutting teeth or cutting edge 110, and is therefore achieved through the cutting edge side associated with the cutting edge 110. The tooth parameters of the cutting edge 110 can be constant or have non-constant values ​​in terms of tooth pitch, tooth height, and angle.

[0030] According to the invention, the third cutting edge segment 134 and the fourth cutting edge segment 135 are arranged at a predetermined angle 163, which is preferably predetermined such that the third cutting edge segment 134 is not arranged tangentially to the second cutting edge segment 133. According to one embodiment, the angle 163 has 1.3°. Alternatively, the third cutting edge segment 134 may be arranged tangentially to the second cutting edge segment 133.

[0031] The first cutting edge segment 132 is preferably arranged at a first distance 196 perpendicular to the longitudinal axis 199 or in the direction of arrow 106, and the fourth cutting edge segment 135 is preferably arranged at a second distance 197 perpendicular to the longitudinal axis 199. Preferably, the first distance 196 is smaller than the second distance 197 by a spacing 161, which is preferably 0.6 mm.

[0032] The second cutting edge section 133 preferably has a highest point arranged toward the longitudinal axis 199 (i.e. Figure 2 298 in the middle). The highest point (i.e. Figure 2 (298) is preferably perpendicular to the longitudinal axis 199 or spaced 162 from the first cut edge segment 132 along the direction of arrow 106. Preferably, the spacing 161 and the spacing 162 are equal in size. Furthermore, the highest point (i.e....) Figure 2 (298) is preferably arranged at a distance of 195 perpendicular to the longitudinal axis 199 or along the direction of arrow 106. Distances 196 and 197 are preferably greater than distance 195.

[0033] The length 123 of the second region 103 is preferably greater than the lengths 122, 124, and 125 of the first region 102 and / or the third region 104 and / or the fourth region 105, respectively. Preferably, the length 121 is greater than the length 122 and less than the lengths 123, 124, and 125, respectively. Furthermore, the length 122 is preferably less than the lengths 121, 123, 124, and 125, respectively. If the total length of the cutting edge 110 is extended, it is preferable to increase only the length 125 of the fourth region 105.

[0034] According to one embodiment, the substrate 111 is made of high-carbon steel, such as high-carbon steel (HCS). According to another embodiment, the cutting edge 110 preferably has a high-speed steel (HSS) strip 140. The HSS strip 140 is preferably made of high-speed steel. Alternatively, the saw blade 100 has a hardened metal strip or a single hardened metal tooth.

[0035] Figure 2 Show Figure 1 A magnified partial view of the saw blade 100, visually showing the cutting edge 110 with four regions 102-105. Each of the multiple cutting teeth 119 has a tooth tip 291. Tooth roots 292 are arranged between adjacent cutting teeth 119. Figure 2 The image shows the cutting edge segments 132, 133, 134, and 135, which are arranged on the tooth tip 291. Figure 2 It also shows the direction 220 of the root line extending along the associated tooth root 292.

[0036] It should be noted that the root line 220 does not necessarily have to extend parallel to the cutting edge segments 132, 133, 134, and 135; rather, the root depth of each cutting tooth can be different. This is especially true when there are different tooth pitches in the cutting edge 110.

[0037] The high-speed steel strip 140 of the cutting blade 110 has heights 299, h1, h2, h3, h4, and h5 as shown in the figure, perpendicular to the longitudinal axis 199. Heights 299, h1-h5 are formed perpendicular to the longitudinal axis 199 from the corresponding tooth tip 291, or from the corresponding cutting edge sections 132, 133, 134, and 135, respectively. Here, height h1 is arranged along the longitudinal axis 199 at one end of the first region 102 facing the fixed section 113, height h2 is arranged between the first region 102 and the second region 103, height h3 is arranged between the second region 103 and the third region 104, height h4 is arranged between the third region 104 and the fourth region 105, and height h5 is arranged at one end of the cutting blade 110 away from the fixed section 113.

[0038] Furthermore, the second concave curved region 103, or the second cut edge segment 133, has a highest point 298 arranged toward the longitudinal axis 199. The highest point 298, as described above, is perpendicular to the longitudinal axis 199 and spaced apart from the first cut edge segment 132 by a distance 162. Here, the connecting line 281, illustrated, connecting the first cut edge segment 132 at height h2 to the highest point 298, has an angle 205 to indicate the distance 162. Furthermore, the connecting line 282, illustrated, connecting the third cut edge segment 134 at height h3 to the highest point 298, has an angle 206 to indicate the distance 162. Preferably, the highest point 298 is along the longitudinal axis 199 at... Figure 1 In the second region 103, the two connecting lines 281 and 282 are arranged in the center such that the two angles 205 and 206 are of the same length and the two angles 205 and 206 are of the same magnitude. Preferably, the angles 205 and 206 have a minimum of 1° and a maximum of 3°. Alternatively, the highest point 298 may also be arranged non-centeredly in the second region 103 along the longitudinal axis 199. According to one embodiment, the second cutting edge segment 133 may be illustrated differently on the left and right sides of the highest point 298. Here, the radius of curvature R1 may be illustrated differently on the left and right sides. For example, one segment may have a first radius of curvature and the other segment may have a second radius of curvature. Similarly, a segment may be constructed with a parabolic curve. Furthermore, alternatively, the angles 205 and 206 may be different.

[0039] According to one embodiment, at the highest point 298 of the second cutting edge section 133, the height 299 of the high-speed steel strip 140 preferably has an associated minimum value. Preferably, in the fourth region 105, the height h5 of the high-speed steel strip 140 has an associated maximum value. According to one embodiment, the minimum value of the height 299 is 0.7 mm. Preferably, the maximum value of the height h5 is 1.9 mm. In particular, in the second region 103, the high-speed steel strip 140 is preferably arranged only regionally perpendicular to the longitudinal axis 199 on the cutting teeth 119.

[0040] Figure 3 Showing from Figure 1 and Figure 2 The cutting edge 110 is observed from the underside of the saw blade 100, and an exemplary arrangement of the cutting teeth 119 is visually shown. The angle of the cutting teeth 119 is preferably variable. Preferably, in the second region 103, the cutting teeth 119 rotate on a radial line about the center point of the radius of curvature R1. Alternatively or optionally, in the third region 104, the cutting teeth 119 preferably rotate on a slope according to a corresponding inclination, or according to an angle 163.

[0041] Preferably, the cutting edge, or multiple cutting teeth 119, are divided into teeth. Here, two adjacent cutting teeth 311, 312 are divided, for example, towards the lower side 301 of the saw blade 100 as shown in the figure. Furthermore, preferably, two adjacent cutting teeth 314, 316 are divided towards the upper side 302 of the saw blade 100 as shown in the figure. Preferably, a non-divided cutting tooth 317 is arranged between the divided cutting teeth 311, 312, 314, 316. It should be noted that the cutting teeth 119 can also be divided in any other way, such that the number of divided cutting teeth 311, 312, 314, 316 on one side and / or the number of non-divided cutting teeth 317 can be arbitrary.

[0042] Figure 4 Show Figures 1 to 3 The saw blade 100 is shown, and the arrangement of the segmented cutting teeth 311, 314 is visually illustrated. Here, the segmentation size 402 of the cutting edge 110 is preferably larger than the blade thickness 401 of the saw blade 100. Alternatively, a continuous trapezoidal hard metal strip or high-speed steel strip can be used at the segmentation portion of the cutting teeth 311. Here, the upper horizontal width of the corresponding trapezoid approximately corresponds to the blade thickness 401, and the lower horizontal width approximately corresponds to the segmentation size 402.

[0043] Figure 5 Show Figures 1 to 4The saw blade 100 and the workpiece 500. The workpiece 500 is preferably tubular and has a diameter 502. The processing step is preferably performed in the second region 103 at the concave curved cutting edge section 133. Here, the workpiece 500 moves along a stroke 501, or reciprocating stroke 501. After this reciprocating stroke 501, the workpiece 500 is still in the second region 103. Preferably, the length of the concave cutting edge section 132 of the second region 103 is at least twice the length of the reciprocating stroke 501.

[0044] Figure 6 Show Figures 1 to 5 The saw blade 100 and the workpiece 600. The workpiece 600 is preferably tubular and has a diameter 602. The diameter 602 is greater than... Figure 5 The workpiece 500 has a diameter 502. Preferably, the diameter 602 is twice the diameter 502. The machining steps are preferably performed in the second region 103 and the third region 104. Here, the workpiece 600 moves along the stroke 601, or reciprocating stroke 601. When using the same hand-held machine tool, with... Figure 5 In contrast, reciprocating stroke 601 corresponds to reciprocating stroke 501. After this reciprocating stroke 601, the workpiece 600 is in the third region 104. This allows for improved cutting performance to be achieved simultaneously for different diameters.

[0045] Preferably, diameter 502 is 1 inch (Zoll), and diameter 602 is 2 inches. Alternatively, diameter 502 is ½ inch and the associated diameter 602 is 1 inch and / or diameter 502 is 2 inches and the associated diameter 602 is 3 inches and / or diameter 502 is 3 inches and the associated diameter 602 is 4 inches. However, other combinations of diameters 502 and 602 may also be used.

[0046] Workpiece 500 or 600 is preferably constructed as a tube with a hollow profile. Alternatively, workpiece 500 or 600 may be constructed as a solid profile. Furthermore, workpiece 500 or 600 may also have any hollow profile. Here, workpiece 500 or 600 is preferably made of plastic, especially PVC, and / or steel. However, workpiece 500 or 600 may also have any other material. Preferably, the total length of the second region 103 and the third region 104 is at least twice the length of the reciprocating stroke 601.

[0047] Figure 7 An alternative saw blade 700 with a cutting edge 710 is shown, the cutting edge having Figure 1 , Figure 2 , Figure 5 and Figure 6The substrate 111 has cut edge segments 132-135, wherein, along the longitudinal axis 199 of the substrate 111, the fifth region 703 is adjacent to the fourth region 105, and the sixth region 705 is adjacent to the fifth region 703. The fifth region 703 preferably has a concave curved fifth cut edge segment 733. Furthermore, the sixth region 705 preferably has a sixth cut edge segment 735 oriented parallel to the longitudinal axis 199. The fifth cut edge segment 733 preferably has a radius of curvature R2. Preferably, the radius of curvature R2 is different from the radius of curvature R1 of the second cut edge segment 133. Alternatively, radii R1 and R2 can be equal. Furthermore, the fifth region 703 has a length 723. This length 723 preferably corresponds to the length 123 of the second region 103. Alternatively, the second and fifth regions 103 and 703 can have different lengths.

[0048] Alternatively, another region is arranged between the fifth region 703 and the sixth region 705, which has cut edge segments arranged at a predetermined angle. Here, the other region is preferably not arranged tangentially to the fifth region 703 or its cut edge segments 733.

[0049] According to one embodiment, the second cutting edge segment 133 is the same as the fifth cutting edge segment 733. Here, the cutting edge segment 733 of the fifth region 703 is constructed in a parabolic curve similar to the second cutting edge segment 133 or has a different radius of curvature. Furthermore, according to another embodiment, the length 125 of the fourth region 105 is the same as the length 725 of the sixth region 705. Alternatively, the length 125 of the fourth region 105 and the length 725 of the sixth region 705 may be different. Preferably, the length 725 of the sixth region 705 is greater than the length 125 of the fourth region 105.

[0050] Furthermore, the highest point 798 of the fifth region 703 is schematically located at a distance 795 perpendicular to the longitudinal axis 199. Preferably, the distance 795 is different from the distance 195 of the highest point 298 of the second region 103, wherein the distance 795 is preferably larger. Alternatively, the two distances 195 and 795 can be the same. It should be noted that the dimensions mentioned in this invention are merely exemplary features and do not limit the invention.

Claims

1. A saw blade (100), in particular a jigsaw blade, having a base sheet (111) comprising a cutting edge (110) with a plurality of cutting teeth (119), wherein On the substrate (111) there is arranged a fixing section (113) for fixing to a hand-held machine tool, wherein the cutting edge (110) comprises, along a longitudinal axis (199) of the substrate (111), starting from the fixing section (113), a first region (102) with a first cutting edge section (132), a second region (103) adjoining the first region (102) and having a second cutting edge section (133), a third region (104) adjoining the second region (103) and having a third cutting edge section (134), and a fourth region (105) adjoining the third region (104) and having a fourth cutting edge section (135), wherein the first and fourth cutting edge sections (132, 135) are oriented parallel to the longitudinal axis (199), wherein the second cutting edge section (133) is concavely curved, and wherein the third cutting edge section (134) is arranged at a predefined angle (163) to the fourth cutting edge section (135).

2. The saw blade of claim 1, wherein, The predefined angle (163) is predefined such that the third cutting edge section (134) is not arranged tangentially to the second cutting edge section (133).

3. The saw blade according to claim 1 or 2, characterized in that, The first cutting edge section (132) is arranged at a first distance (196) perpendicular to the longitudinal axis (199), and the fourth cutting edge section (135) is arranged at a second distance (197) perpendicular to the longitudinal axis (199), wherein the first distance (196) is smaller than the second distance (197) by a first spacing (161).

4. The saw blade of claim 3, wherein, The second cutting edge section (133) has a highest point (298) arranged towards the longitudinal axis (199), which highest point is spaced apart from the first cutting edge section (132) by a second spacing (162) perpendicular to the longitudinal axis (199).

5. The saw blade according to claims 3 and 4, characterized in that, The first distance (161) and the second distance (162) are equal in size.

6. The saw blade of any of the preceding claims, wherein, The cutting edge (110) has a high-speed steel strip (140) having a height (299, h5) formed perpendicular to the longitudinal axis (199).

7. The saw blade according to claims 4 and 6, characterized in that At the highest point (298) of the second cutting edge section (133), the height (299) of the high-speed steel strip (140) has an associated minimum value.

8. The saw blade of claim 6 or 7, wherein, In the fourth region (105), the height (h5) of the high-speed steel strip (140) has an associated maximum value.

9. The saw blade of any of the preceding claims, wherein, The length (123) of the second region (103) is greater than the length (122, 124, 125) of the first region (102) and / or the third region (104) and / or the fourth region (105), respectively.

10. The saw blade of any of the preceding claims, wherein, Along the longitudinal axis (199) of the substrate (111), the fourth region (105) is adjoined on the one hand by a fifth region (703) having a fifth cut edge section (733) which is curved concavely, and on the other hand by a sixth region (705) having a sixth cut edge section (735) which is oriented parallel to the longitudinal axis (199).

11. A hand-held power tool, in particular a jigsaw, preferably a spike saw or a saber saw, having a saw blade (100) according to any one of the preceding claims.

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