saw blade

Abstract

In a saw blade (100), in particular a reciprocating saw blade, with a body blade (111) having a cutting edge (110) with a plurality of cutting teeth (119), wherein a mounting section (113) for attachment to a hand-held power tool is arranged on the body blade (111), the cutting edge (110) has, along a longitudinal axis (199) of the body blade (111) starting from the mounting section (113), a first region (102) with a first cutting edge section (132), a second region (103) adjoining the first region (102) with a second cutting edge section (133), a third region (104) adjoining the second region (103) with a third cutting edge section (134), and a fourth region (105) adjoining the third region (104) with a fourth cutting edge section (135), wherein the first and fourth cutting edge sections (132, 135) are aligned 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 predetermined angle (163) to the fourth cutting edge section (135).

Description

State of the art

[0001] The present invention relates to a saw blade, in particular a reciprocating saw blade, such as a jigsaw or saber saw blade, with a base blade which has a cutting edge with a plurality of cutting teeth, wherein a fastening section for fastening to a hand-held power tool is arranged on the base blade, and wherein the cutting edge has, along a longitudinal axis of the base blade, starting from the fastening section, a first region with a first cutting edge section, a second region adjoining the first region with a second cutting edge section, and a third region adjoining the second region with a third cutting edge section.

[0002] DE 10 2013 204 372 B4 discloses such a saw blade with three zones. The three zones have associated cutting edge sections. Two zones have a straight cutting edge section, and one zone, located between the two straight zones, has a concavely curved cutting edge section. Disclosure of the invention

[0003] The invention relates to a saw blade, in particular a reciprocating saw blade, with a blade base having a cutting edge with a plurality of cutting teeth, wherein a fastening section for fastening to a hand-held power tool is arranged on the blade base. The cutting edge has, along a longitudinal axis of the blade base, starting from the fastening section, a first region with a first cutting edge section, a second region adjacent to the first region with a second cutting edge section, a third region adjacent to the second region with a third cutting edge section, and a fourth region adjacent to the third region with a fourth cutting edge section. The first and fourth cutting edge sections are aligned parallel to the longitudinal axis. The second cutting edge section is concavely curved. The third cutting edge section is arranged at a predetermined angle to the fourth cutting edge section.

[0004] The invention thus makes it possible to provide a saw blade in which the third region with the third cutting edge section arranged at a predetermined angle to the fourth cutting edge section allows an extension of the range of use of the saw blade to two different workpiece diameters, and in this case an increase in the saw blade service life and the cutting speed can be achieved without the sawing performance at the original workpiece diameter being negatively affected.

[0005] Preferably, the predetermined angle is predetermined such that the third cutting edge portion is not arranged tangentially to the second cutting edge portion.

[0006] This makes it easy to extend the saw blade's range of use for use on two workpieces with different diameters.

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

[0008] This makes it easy and straightforward to provide a suitable transition between the second area and the fourth area.

[0009] The second cutting edge portion preferably has a high point arranged facing the longitudinal axis, which is spaced perpendicular to the longitudinal axis by a second distance from the first cutting edge portion.

[0010] This allows the concave curved area to be formed in a simple manner.

[0011] Preferably, the first distance and the second distance are the same.

[0012] This makes it easy and straightforward to provide a suitable cutting edge with the four areas.

[0013] According to one embodiment, the cutting edge has an HSS strip with a height perpendicular to the longitudinal axis.

[0014] This allows for a more wear-resistant and at the same time flexible saw blade to be provided.

[0015] At the highest point of the second cutting edge section, the height of the HSS strip preferably has an associated minimum value. Preferably, in the fourth region, the height of the HSS strip has an associated maximum value.

[0016] This allows for a cost-effective and more wear-resistant saw blade to be provided.

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

[0018] This makes it easy to divide the individual areas appropriately.

[0019] According to one embodiment, along the longitudinal axis of the blade base, a fifth region with a concavely curved fifth cutting edge section adjoins the fourth region, and a sixth region with a sixth cutting edge section aligned parallel to the longitudinal axis adjoins the fifth region.

[0020] This makes it easy and straightforward to provide an alternative saw blade that is improved for other workpiece diameters without negatively affecting the sawing performance for corresponding original workpiece diameters.

[0021] Furthermore, the present invention relates to a hand-held power tool, in particular a reciprocating saw, preferably a jigsaw or saber saw, with a saw blade according to the invention.

[0022] The invention thus enables the provision of a hand-held power tool with a saw blade in which the third region with the third cutting edge section arranged at a predetermined angle to the fourth cutting edge section allows an extension of the range of use of the saw blade to two different workpiece diameters and in this case an increase in the saw blade service life can be achieved without the sawing performance at the original workpiece diameter being negatively affected. Short description of the drawings

[0023] The invention is explained in more detail in the following description using exemplary embodiments illustrated in the drawings. They show: Fig. 1 a side view of a saw blade according to the invention, Fig. 2 an enlarged view of a cutting edge of the saw blade of Fig. 1, Fig. 3 a plan view of the cutting teeth of the saw blade associated with the cutting edge of Fig. 1 and Fig. 2, Fig. 4 a sectional view through the saw blade of Fig. 1 to Fig. 3, Fig. 5 a side view of the saw blade of Fig. 1 to Fig. 4 with a workpiece having a first diameter, Fig. 6 a side view of the saw blade of Fig. 1 to Fig. 4 with a workpiece having a second diameter, and Fig. 7 a side view of another saw blade according to the invention. Description of the embodiments

[0024] In the figures, elements with the same or comparable function are provided with identical reference symbols and are described in detail only once.

[0025] Fig. 1 shows a saw blade 100 for a handheld power tool. The saw blade 100 is preferably designed as a reciprocating saw blade for a reciprocating saw, preferably for a reciprocating saw or jigsaw.

[0026] The saw blade 100 has a blade base 111 and a fastening section 113 arranged on the blade base 111. The blade base 111 and the fastening section 113 are preferably formed as a single piece. The fastening section 113 is designed for fastening the saw blade 100 to a handheld power tool. The fastening section 113 preferably forms a region 101 with a length 121. Furthermore, the fastening section 113 is preferably arranged at an inclination angle 198 to a longitudinal axis 199 of the blade base 111. According to one embodiment, the inclination angle 198 is 3°-5°.

[0027] Furthermore, the blade base 111 has a cutting edge 110 with a plurality of cutting teeth 119. The cutting edge 110 is arranged on the blade base 111 opposite a blade spine 112 of the saw blade 100. Illustratively, the blade spine 112 is arranged parallel to the longitudinal axis 199. Alternatively, the blade spine 112 can also be arranged at a predetermined angle to the longitudinal axis 199.

[0028] The cutting edge 110 has a first, second, third, and fourth region 102, 103, 104, 105 along a longitudinal axis 199 of the blade base 111, or along an arrow 109, starting from the attachment section 113. Each region 102-105 is assigned a cutting edge section 132, 133, 134, 135. Thus, the cutting edge 110 has a first cutting edge section 132 assigned to the first region 102, a second region 103 adjacent to the first region 102 with a second cutting edge section 133, a third region 104 adjacent to the second region 103 with a third cutting edge section 134, and a fourth region 105 adjacent to the third region 104 with a fourth cutting edge section 135.

[0029] Preferably, the first and fourth cutting edge sections 132, 135 are aligned parallel to the longitudinal axis 199. In this case, the first and fourth cutting edge sections 132, 135 are also arranged parallel to the blade back 112 when the blade back 112 is aligned parallel to the longitudinal axis 199. Furthermore, the second cutting edge section 133 is preferably concavely curved. Preferably, the second cutting edge section 133 is concavely or arcuately curved toward the longitudinal axis 199. In this case, the second cutting edge section 133 has a uniform, constant radius of curvature R1. Alternatively, the second cutting edge section 133 can also have a varying radius of curvature R1 and, for example, be parabolically curved.

[0030] Preferably, the curvature of the second cutting edge portion 133 can be created during the manufacture of the saw blade simultaneously with the introduction of a toothing, or of the cutting edge 110, and thus takes place via a cutting edge side associated with the cutting edge 110. A toothing geometry of the cutting edge 110 can be constant with regard to a pitch, a height, and an angle, or can have non-constant values.

[0031] According to the invention, the third cutting edge portion 134 is arranged at a predetermined angle 163 to the fourth cutting edge portion 135. Preferably, the predetermined angle 163 is such that the third cutting edge portion 134 is not arranged tangentially to the second cutting edge portion 133. According to one embodiment, the angle 163 is 1.3°. Alternatively, the third cutting edge portion 134 can be arranged tangentially to the second cutting edge portion 133.

[0032] Preferably, the first cutting edge portion 132 is arranged at a first distance 196 perpendicular to the longitudinal axis 199 or in the direction of an arrow 106. Furthermore, the fourth cutting edge portion 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 distance 161. The distance 161 is preferably 0.6 mm.

[0033] The second cutting edge section 133 preferably has a high point (298 in Fig. 2). The highest point (298 in Fig. 2) is preferably spaced perpendicular to the longitudinal axis 199 or in the direction of the arrow 106 by a distance 162 from the first cutting edge portion 132. Preferably, the distance 161 and the distance 162 are equal. In addition, the high point (298 in Fig. 2) preferably arranged at a distance 195 perpendicular to the longitudinal axis 199, or in the direction of arrow 106. The distances 196, 197 are preferably each greater than the distance 195.

[0034] The second region 103 preferably has a length 123 that is greater than a length 122, 124, 125 of the first and / or third and / or fourth regions 102, 104, 105. Preferably, the length 121 is greater than the length 122 and smaller than the lengths 123, 124, 125. Furthermore, the length 122 is preferably smaller than the lengths 121, 123, 124, 125. If the overall length of the cutting edge 110 increases, preferably only the length 125 of the fourth region 105 increases.

[0035] According to one embodiment, the blade base 111 comprises a steel with a high carbon content, e.g., carbon steel or high carbon steel (HCS). According to another embodiment, the cutting edge 110 comprises a high-speed steel or high-speed steel (HSS) strip 140. Preferably, the HSS strip 140 comprises high-speed steel. Alternatively, the saw blade 100 may comprise a carbide strip or individual carbide teeth.

[0036] Fig. 2 shows an enlarged section of the saw blade 100 of Fig. 1 and illustrates the cutting edge 110 with its four regions 102-105. Each cutting tooth 119 of the plurality of cutting teeth has a tooth tip 291. Between two adjacent cutting teeth 119, a tooth base 292 is arranged. In Fig. 2 shows the cutting edge sections 132, 133, 134, 135, which are arranged at the tooth tips 291. Furthermore, Fig. 2 a tooth base line 220 which runs along the associated tooth bases 292.

[0037] It should be noted that the tooth base line 220 does not necessarily have to run parallel to the cutting edge sections 132, 133, 134, and 135. Rather, the tooth base depths of each cutting tooth can be different. This is especially the case when different tooth pitches are present in the cutting edge 110.

[0038] The HSS strip 140 of the cutting edge 110 has illustrative heights 299, h1, h2, h3, h4, h5 perpendicular to the longitudinal axis 199. The heights 299, h1-h5 are each formed by an associated tooth tip 291 or by the associated cutting edge section 132, 133, 134, 135 perpendicular to the longitudinal axis 199. Here, a height h1 is arranged along the longitudinal axis 199 at an end of the first region 102 facing the fastening section 113, a height h2 is arranged between the first and second regions 102, 103, a third height h3 is arranged between the second and third regions 103, 104, a fourth height h4 is arranged between the third and fourth regions 104, 105 and a fifth height h5 is arranged at an end of the cutting edge 110 facing away from the fastening section 113.

[0039] In addition, the second concavely curved region 103, or the second cutting edge section 133, has a high point 298 arranged facing the longitudinal axis 199. The high point 298 is, as described above, spaced perpendicularly to the longitudinal axis 199 by the distance 162 from the first cutting edge section 132. Here, an illustratively shown connecting line 281, which connects the first cutting edge section 132 at the location of the height h2 to the high point 298, has an angle 205 to represent the distance 162. Furthermore, an illustratively shown connecting line 282, which connects the third cutting edge section 134 at the location of the height h3 to the high point 298, has an angle 206 to represent the distance 162. Preferably, the high point 298 is along the longitudinal axis 199 from Fig. 1 is arranged centrally in the second region 103, so that the two connecting lines 281, 282 are of equal length and the two angles 205, 206 are of equal size. Preferably, the angles 205, 206 are at least 1° and at most 3°. Alternatively, the high point 298 along the longitudinal axis 199 can also be arranged off-center in the second region 103. According to one embodiment, the second cutting edge section 133 can be designed differently, illustratively to the left of the high point 298 and illustratively to the right of the high point 298. In this case, the radius of curvature R1 can be designed differently, illustratively to the left and right of the high point 298. For example, one section can have a first radius of curvature and another section a second radius of curvature. Likewise, a section can be parabolically curved. Furthermore, the angles 205, 206 can alternatively be different.

[0040] According to one embodiment, at the high point 298 of the second cutting edge section 133, the height 299 of the HSS strip 140 has an associated minimum value. Preferably, in the fourth region 135, the height h5 of the HSS 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. Particularly in the second region 103, the HSS strip 140 is preferably arranged on the cutting tooth 199 only in some regions perpendicular to the longitudinal axis 199.

[0041] Fig. 3 shows the cutting edge 110 from a bottom side of the saw blade 100 of Fig. 1 and Fig. 2 and illustrates an exemplary arrangement of the cutting teeth 119. Preferably, the angle of the cutting teeth 119 is variable. Preferably, the cutting teeth 119 rotate in the second region 103 on the radius line of the radius of curvature R1 relative to the radius center. Alternatively or optionally, the cutting teeth 119 preferably rotate in the third region 104 on the slope according to the corresponding inclination or according to the angle 163.

[0042] Preferably, the cutting edge or the plurality of cutting teeth 119 is set. For example, two adjacent cutting teeth 311, 312 are each set to an illustrative lower side surface 301 of the saw blade 100. Furthermore, two adjacent cutting teeth 314, 316 are preferably set to an illustrative upper side surface 302 of the saw blade 100. Preferably, a cutting tooth 317, which is not set, is arranged between the set cutting teeth 311, 312, 314, 316. It should be noted that the cutting teeth 119 can also be set in any other desired manner, so that the number of cutting teeth 311, 312, 314, 316 set on each side and / or the number of non-set cutting teeth 317 can be arbitrarily selected.

[0043] Fig. 4 shows the saw blade 100 of Fig. 1 to Fig. 3 and illustrates the arrangement of the set cutting teeth 311, 314. The cutting edge 110 has a set dimension 402 that is preferably greater than a blade thickness 401 of the saw blade 100. Alternatively, a continuously trapezoidal hard metal strip or an HSS strip can be used instead of the set of the cutting teeth 311, 314. In this case, an upper, horizontal width of the corresponding trapezoid approximately corresponds to the blade thickness 401, and the lower, horizontal width approximately corresponds to the set dimension 402.

[0044] Fig. 5 shows the saw blade 100 of Fig. 1 to Fig. 4 with a workpiece 500. Preferably, the workpiece 500 is tubular and has a diameter 502. A machining step preferably takes place in the second region 103 at the concavely curved cutting edge section 133. In this process, the workpiece 500 moves along a path 501 or makes a stroke 501. After such a stroke 501, the workpiece 500 is still located in the second region 103. Preferably, the length of the second region 103 with the concave cutting edge section 132 is at least twice as long as the stroke 501.

[0045] Fig. 6 shows the saw blade 100 of Fig. 1 to Fig. 5 with a workpiece 600. Preferably, the workpiece 600 is tubular and has a diameter 602. The diameter 602 is larger than the diameter 502 of Fig. 5. Preferably, the diameter 602 is twice as large as the diameter 502. A machining step preferably takes place in the second and third region 103, 104. Here, the workpiece 600 moves along a path 601 or makes a stroke 601. The stroke 601 corresponds, when using the same hand tool, in direct comparison to Fig. 5 the stroke 501. After such a stroke 601, the workpiece 600 is located in the third area 104. This allows an increased cutting performance to be achieved with different diameters at the same time.

[0046] Preferably, diameter 502 is 1 inch and diameter 602 is 2 inches. Alternatively, diameter 502 may be 1 / 2 inches and the associated diameter 602 is 1 inch, and / or diameter 502 may be 2 inches and the associated diameter 602 is 3 inches, and / or diameter 502 may be 3 inches and the associated diameter 602 is 4 inches. However, other combinations of diameters 502 and 602 may also be used.

[0047] Preferably, the workpieces 500 and 600 are formed as tubes with a hollow profile. Alternatively, the workpieces 500 and 600 can be formed as solid profiles. Furthermore, the workpieces 500 and 600 can also have any desired hollow profile. In this case, the workpieces 500, 600 are preferably made of plastic, in particular PVC and / or steel. However, the workpieces 500, 600 can also be made of any desired material. Preferably, the combined length of the second and third regions 103, 104 is at least twice as long as the stroke 601.

[0048] Fig. Figure 7 shows an alternative saw blade 700 having a cutting edge 710 which has the cutting edge portions 132-135 of Fig. 1, Fig. 2, Fig. 5 and Fig.6, wherein along the longitudinal axis 199 of the blade base 111, a fifth region 703 adjoins the fourth region 105 and a sixth region 705 adjoins the fifth region 703. Preferably, the fifth region 703 has a concavely curved fifth cutting edge portion 733. Furthermore, the sixth region 705 preferably has a sixth cutting edge portion 735 aligned parallel to the longitudinal axis 199. The fifth cutting edge portion 733 preferably has a radius of curvature R2. Preferably, the radius of curvature R2 differs from the radius of curvature R1 of the second cutting edge portion 133. Alternatively, the radii R1 and R2 can be the same. Furthermore, the fifth region 703 has a length 723. The length 723 preferably corresponds to the length 123 of the second region 103. Alternatively, the second and fifth regions 103, 703 may have different lengths.

[0049] Alternatively, a further region with a cutting edge section arranged at a predetermined angle is arranged between the fifth and sixth regions 703, 705. In this case, the further region is preferably not arranged tangentially to the fifth region 703 or its cutting edge section 733.

[0050] According to one embodiment, the second and fifth cutting edge sections 133, 733 are identical. The cutting edge section 733 of the fifth region 703 can be parabolically curved, similar to the second cutting edge section 133, or can have different radii of curvature. Furthermore, according to another embodiment, the length 125 of the fourth region 105 and a length 725 of the sixth region 705 are identical. Alternatively, the lengths 125, 725 of the fourth region 105 and the sixth region 705 can be different. Preferably, the length 725 of the sixth region 705 is greater than the length 125 of the fourth region 105.

[0051] Furthermore, a high point 798 of the fifth region 703 is illustratively arranged at a distance 795 perpendicular to the longitudinal axis 199. Preferably, the distance 795 and the distance 195 of the high point 298 of the second region 103 are different, with the distance 795 preferably being greater. Alternatively, the two distances 195, 795 can be the same. It should be noted that the dimensions mentioned in the present invention are merely exemplary and do not limit the invention. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2013 204 372 B4

[0002]

Claims

[1] Saw blade (100), in particular a reciprocating saw blade, with a blade base (111) having a cutting edge (110) with a plurality of cutting teeth (119), wherein a fastening section (113) for fastening to a hand-held power tool is arranged on the blade base (111), wherein the cutting edge (110) has, along a longitudinal axis (199) of the blade base (111), starting from the fastening section (113), a first region (102) with a first cutting edge section (132), a second region (103) adjoining the first region (102) with a second cutting edge section (133), a third region (104) adjoining the second region (103) with a third cutting edge section (134), and a fourth region (105) adjoining the third region (104) with a fourth cutting edge section (135), wherein the first and the fourth Cutting edge section (132, 135) are aligned parallel to the longitudinal axis (199),wherein the second cutting edge portion (133) is concavely curved, and wherein the third cutting edge portion (134) is arranged at a predetermined angle (163) to the fourth cutting edge portion (135). [2] Saw blade according to claim 1, characterized by that the predetermined angle (163) is predetermined such that the third cutting edge portion (134) is not arranged tangentially to the second cutting edge portion (133). [3] Saw blade according to claim 1 or 2, characterized by in that the first cutting edge portion (132) is arranged at a first distance (196) perpendicular to the longitudinal axis (199) and the fourth cutting edge portion (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 distance (161). [4] Saw blade according to claim 3, characterized bythat the second cutting edge portion (133) has a high point (298) arranged facing the longitudinal axis (199) and spaced from the first cutting edge portion (132) by a second distance (162) perpendicular to the longitudinal axis (199). [5] Saw blade according to claims 3 and 4, characterized by that the first distance (161) and the second distance (162) are equal. [6] Saw blade according to one of the preceding claims, characterized by that the cutting edge (110) has an HSS strip (140) with a height (299, h5) perpendicular to the longitudinal axis (199). [7] Saw blade according to claims 4 and 6, characterized by that at the high point (298) of the second cutting edge section (133) the height (299) of the HSS strip (140) has an associated minimum value. [8] Saw blade according to claim 6 or 7, characterized by that in the fourth region (105) the height (h5) of the HSS strip (140) has an associated maximum value. [9] Saw blade according to one of the preceding claims, characterized by that the second region (103) has a length (123) which is greater than a length (122, 124, 125) of the first and / or third and / or fourth region (102, 104, 105). [10] Saw blade according to one of the preceding claims, characterized by that along the longitudinal axis (199) of the base blade (111) a fifth region (703) with a concavely curved fifth cutting edge section (733) adjoins the fourth region (105) and a sixth region (705) with a sixth cutting edge section (735) aligned parallel to the longitudinal axis (199) adjoins the fifth region (703). [11] Hand tool, in particular a reciprocating saw, preferably a jigsaw or saber saw, with a saw blade (100) according to one of the preceding claims.

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