Blade for reciprocating saw and reciprocating saw

Abstract

The invention relates to a blade for a reciprocating saw and the reciprocating saw. The blade for the reciprocating saw is provided with a main body and at least one hard tip, the main body is a long body, and one end of the main body in the length direction is detachably installed on the reciprocating saw; the at least one hard tip has a higher hardness than the body and is engaged with the body. The main body includes a blade portion including a plurality of teeth arranged in a longitudinal direction, and a back portion extending in the longitudinal direction on a side opposite to the blade portion in a width direction orthogonal to the longitudinal direction. The tip portion includes at least one curved portion. Each of the at least one curved portion is configured so that a blade tip line, which is a line connecting the tips of the plurality of teeth included in each of the at least one curved portion, is curved in a concave shape toward the back portion. The at least one hard tip engages at least one tooth of the plurality of teeth. Therefore, the blade for the reciprocating saw, which is excellent in durability, can be provided.

Description

Technical Field

[0001] The present invention relates to a blade which is detachably mounted on a reciprocating saw for use, and the reciprocating saw. Background Art

[0002] A reciprocating saw (also called a saber saw) is a tool that reciprocates a detachably mounted blade (reciprocating saw blade) to cut (sever) a workpiece. Various improvements are known to improve the durability of a blade for a reciprocating saw. For example, Patent No. 6870730 discloses a blade having a tip portion and a back portion and including a curved portion in which the tip portion is curved toward the back portion, and a diamond layer is formed on the curved portion. Summary of the invention

[0003] In the above-mentioned blade, a curved portion is provided at the tip of a knife and diamond particles are bonded to the entire curved portion, and the durability of the blade is improved by forming a diamond layer. On the other hand, a more complicated process is required in order to form a diamond layer at the curved portion. Therefore, it is hoped that the durability of the blade can be improved without using a diamond layer.

[0004] In view of the above circumstances, one non-limiting object of the present invention is to provide a blade for a reciprocating saw (reciprocating saw blade) having excellent durability.

[0005] According to one non-limiting embodiment of the present invention, there is provided a blade (reciprocating saw blade) for a reciprocating saw, which has an elongated body and at least one hard tip, wherein the at least one hard tip has a higher hardness than the main body and is engaged with the main body. One end portion of the main body in the longitudinal direction is configured to be detachably mounted on the reciprocating saw. The main body includes a blade tip portion and a back portion. The blade tip portion includes a plurality of teeth arranged along the longitudinal direction of the main body. The back portion extends in the longitudinal direction on the side opposite to the blade tip portion in the width direction orthogonal to the longitudinal direction of the main body.

[0006] The blade tip portion includes at least one curved portion. Each curved portion of the at least one curved portion is configured such that its blade tip line is curved concavely toward the back. The blade tip line refers to a line connecting the top ends of a plurality of teeth included in each curved portion of the at least one curved portion. At least one hard tip is connected to at least one tooth among the plurality of teeth.

[0007] According to another non-limiting embodiment of the present invention, there is provided a blade for a reciprocating saw, which has an elongated body and at least one hard tip, wherein the at least one hard tip has a higher hardness than the main body and is engaged with the main body. One end of the main body in the longitudinal direction is configured to be detachably mounted on the reciprocating saw. The main body includes a blade tip portion and a back portion. The blade tip portion includes a plurality of teeth arranged along the longitudinal direction of the main body. The back portion extends in the longitudinal direction on the side opposite to the blade tip portion in the width direction orthogonal to the longitudinal direction of the main body.

[0008] The blade tip portion includes at least one curved portion. Each curved portion of the at least one curved portion includes at least a first tooth and a second tooth. In the width direction of the body, the distance between the top and back of the first tooth and the distance between the top and back of the second tooth are different from each other. At least one hard tip is engaged with at least one tooth among the plurality of teeth.

[0009] In the above-mentioned embodiment, as the material of the hard tip, for example, a superhard alloy or a cermet can be suitably used. Typically, one hard tip is engaged with one tooth. Therefore, when a plurality of hard tips are used, typically, the plurality of hard tips are engaged with the same number of teeth, respectively. The number of hard tips may be the same as the number of teeth, or may be less than the number of teeth.

[0010] The blade for a reciprocating saw of the above-mentioned method has a blade tip portion including at least one curved portion, and at least one hard tip is joined to at least one of the multiple teeth of the blade tip portion. According to such a structure, the curved portion can improve the cutting efficiency and durability of the blade, and the hard tip can further improve the durability. In addition, it is relatively easy to selectively join the hard tip to a part or all of the multiple teeth, so that a portion with a higher hardness than the main body can be efficiently formed at a desired position.

[0011] According to another non-limiting embodiment of the present invention, there is provided a reciprocating saw having a blade receiving portion and a blade of any one of the above embodiments mounted on the blade receiving portion, wherein the blade receiving portion is configured to receive one end of the blade in a detachable manner. The reciprocating saw uses a blade having a blade tip including at least one curved portion and at least one hard tip, and can efficiently and long-term cut a workpiece, wherein the at least one hard tip is engaged with at least one tooth among a plurality of teeth of the blade tip portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the reciprocating saw in a state where the blade according to the first embodiment is mounted. Figure 2 This is an overall view of the insert according to the first embodiment. Figure 3This is a partial enlarged view of the tip of the blade. Figure 4 This is a partially enlarged view of the blade tip portion of the insert according to the second embodiment. Figure 5 This is a partial enlarged view of the blade tip portion of the insert according to the third embodiment. Figure 6 This is an overall view of the insert according to the fourth embodiment (however, the blade tip portion of the insert is simplified in illustration). Figure 7 This is an overall view of the insert according to the fifth embodiment (however, the blade tip portion of the insert is simplified in illustration). Figure 8 It is an explanatory diagram of a modified example of the mounting portion. Fig. 9 It is an explanatory diagram of another modified example of the mounting portion. [Explanation of Reference Numerals] 1: reciprocating saw; 11: tool body; 13: handle; 131: grip; 133: trigger; 135: switch; 18: battery; 5A, 5B, 5C, 5D, 5E, 5X, 5Y: blade; 21: motor; 211: output shaft; 25: drive mechanism; 28: blade receiving part; 281: holder; 283: locking pin; 51A, 51C, 51D, 51E: body; 51 1. 511X, 511Y: mounting part; 512: engaging hole; 515: parallel surface; 516: free end; 52A, 52C, 52E: tip part; 520: tooth group; 521: tooth; 53A, 53E: bending part; 530: tip line; 531: first end; 532: second end; 54: hole; 56: back; 58: hard tip; EL: full length of the bending part; RL: reference line. DETAILED DESCRIPTION

[0013] In a non-limiting embodiment of the present invention, each curved portion of at least one curved portion of the above-mentioned method has a first end in the length direction and a second end located on the opposite side of the first end in the length direction. In the width direction of the main body, the maximum distance between the knife tip line and the line segment connecting the first end and the second end can be less than 15 mm. According to this embodiment, the cutting efficiency and durability can be effectively improved. In addition, the maximum distance between the line segment connecting the first end and the second end and the knife tip line is preferably smaller as the length of each curved portion of the main body in the length direction is smaller.

[0014] In addition to or in place of the above-described embodiment, the blade tip may include a plurality of curved portions. According to this embodiment, the position of contact with the workpiece can be easily changed during cutting, thereby effectively improving durability.

[0015] In addition to or in place of the above-mentioned embodiment, the plurality of teeth of the blade tip may include a plurality of tooth groups repeatedly arranged along the length direction. Each of the plurality of tooth groups may also have an unequal pitch pattern including a plurality of different tooth pitches. In other words, the blade tip may also adopt a so-called variable pitch or a combined pitch. According to this embodiment, vibration and noise caused by resonance can be reduced.

[0016] In addition to or in lieu of the above-described embodiment, at least one hard tip may be engaged with only a portion of the plurality of teeth of the blade tip portion. In other words, the number of teeth engaged with the hard tip may be less than the total number of the plurality of teeth. According to this embodiment, the number of hard tips can be reduced compared to a case where the hard tips are engaged with all of the plurality of teeth, thereby reducing manufacturing costs.

[0017] In addition to or in place of the above-described embodiment, the body of the blade may have at least one hole. According to this embodiment, by improving the heat dissipation of the blade body, it can contribute to further improving durability.

[0018] In addition to or in place of the above-described embodiment, the reciprocating saw may further include a motor and a drive mechanism, wherein the drive mechanism is configured to be operably connected to the motor and the blade receiving portion, and to reciprocate the blade receiving portion in the first direction by the power of the motor. The length direction of the blade mounted on the blade receiving portion may also be inclined relative to the first direction. According to this embodiment, when cutting a tubular workpiece (e.g., a pipe), for example, the amount of cutting can be different at two locations where the blade cuts into the workpiece.

[0019] The following non-limiting embodiments of the present invention are described with reference to the accompanying drawings. In addition, in the following description of the embodiments and the accompanying drawings referred to, substantially the same structures (including those with slightly different shapes) are marked with the same reference numerals, and the description thereof is appropriately omitted or simplified.

[0020] <First embodiment> The following reference Figure 1 to Figure 3 The blade 5A according to the first embodiment will be described.

[0021] The blade 5A is a tip tool for cutting, and is used by being detachably mounted on an electric reciprocating saw. Figure 1The reciprocating saw 1 shown is an example of a reciprocating saw to which a blade 5A can be mounted. In addition, not only the blade 5A of this embodiment but also other multiple types of blades can be selectively mounted on the reciprocating saw 1. The reciprocating saw 1 is configured to cut a workpiece such as wood, plastic, steel, or pipe by reciprocating the blade.

[0022] First, the reciprocating saw 1 will be briefly described. The outer contour of the reciprocating saw 1 is formed by a tool body 11 and a handle 13 connected to the tool body 11 .

[0023] The tool body 11 is an elongated hollow body. The long axis of the tool body 11 defines the front-rear direction of the reciprocating saw 1. The handle 13 includes a grip 131 for the user to grip. The grip 131 extends behind the tool body 11 in a manner substantially perpendicular to the front-rear direction. The direction perpendicular to the long axis of the tool body 11 and corresponding to the extending direction of the grip 131 defines the up-down direction of the reciprocating saw 1. The grip 131 is provided with a trigger 133 and a switch 135. A rechargeable battery 18 can be mounted on the lower end of the handle 13.

[0024] The tool body 11 contains a motor 21 , a drive mechanism 25 , and a blade receiving portion 28 .

[0025] The motor 21 is driven while the user is pressing the trigger 133 to turn on the switch 135. The drive mechanism 25 is operably connected to the motor 21 and driven by the power of the motor 21. The drive mechanism 25 includes a motion conversion mechanism configured to convert the rotational motion of the output shaft 211 of the motor 21 into a linear motion.

[0026] The blade receiving portion 28 is disposed in the front end portion of the tool body 11. The blade receiving portion 28 is configured to receive the blade in a detachable manner and to be held in a fixed state. Although detailed illustrations are omitted, the blade receiving portion 28 of this embodiment has a well-known clamping mechanism widely used in various reciprocating saws. The clamping mechanism includes a retaining frame 281 having a slit and a locking pin 283, wherein the locking pin 283 can move between a locked position protruding into the slit and an unlocked position not protruding into the slit.

[0027] The blade receiving portion 28 is movably connected to the driving mechanism 25 (motion conversion mechanism), and reciprocates in the substantially front-rear direction with the driving of the motor 21. Accordingly, the blade mounted on the blade receiving portion 28 also reciprocates, and the workpiece is cut by the blade.

[0028] The detailed structure of the blade 5A will be described below.

[0029] like Figure 2 and Figure 3As shown, the blade 5A includes a main body 51A, and a plurality of hard tips 58 coupled to the main body 51A.

[0030] The main body 51A is a long thin plate-like component having length, width and thickness, and is also called a substrate. In addition, the main body 51A widely available on the market has a total length of about 50 to 400 millimeters (mm), a width of about 5 to 50 mm, and a thickness of about 0.5 to 2.0 mm.

[0031] The main body 51A is made of metal, for example, steel. One end of the main body 51A in the longitudinal direction LDDE is configured as a mounting portion 511 that can be mounted on the blade receiving portion 28. The other end of the main body 51A in the longitudinal direction LD is a free end 516.

[0032] In this embodiment, the mounting portion 511 has a size and shape that can be inserted into the slit of the retaining frame 281 of the blade receiving portion 28 (clamping mechanism), but detailed illustration is omitted. The mounting portion 511 has a pair of parallel surfaces 515, which extend parallel to each other at a distance in the width direction WD of the main body 51A. In addition, the mounting portion 511 has a locking hole 512 into which the locking pin 283 can be fitted.

[0033] like Figure 1 As shown, when the mounting portion 511 of the blade 5A is arranged in the slit, the parallel surface 515 of the mounting portion 511 is arranged along the abutment surface of the retainer in a manner substantially orthogonal to the axis extending in the up-down direction. Accordingly, the mounting portion 511 is positioned relative to the blade receiving portion 28. When the locking pin 283 is inserted into the engaging hole 512 and locked in the locking position, the main body 51A (blade 5A) is fixedly held in the blade receiving portion 28. When the mounting portion 511 is fixed to the blade receiving portion 28, the main body 51A protrudes from the tool body 11 and extends forward. In addition, in a state where the mounting portion 511 is fixed to the blade receiving portion 28, the longitudinal direction LD of the main body 51A (the long axis of the main body 51A) is inclined obliquely downward relative to the front-rear direction of the reciprocating saw 1 (the long axis of the tool body 11) as it approaches the front of the reciprocating saw 1.

[0034] like Figure 2As shown, the main body 51A includes a blade tip portion 52A and a back portion 56. The blade tip portion 52A extends between the mounting portion 511 and the free end 516 along one end extending in the length direction LD of the main body 51A. The blade tip portion 52A is a portion for cutting the workpiece, and includes a plurality of teeth 521. In addition, in the present embodiment, all teeth 521 have the same height and are arranged at the same pitch (i.e., at equal intervals). The back portion 56 extends between the mounting portion 511 and the free end 516 along the other end extending in the length direction LD of the main body 51A. That is, the back portion 56 is arranged along the end portion on the opposite side of the blade tip portion 52A in the width direction WD of the main body 51A.

[0035] The blade tip portion 52A includes a curved portion 53A. The curved portion 53A is a portion where a line connecting the tips (tooth tips) of the teeth 521 in the blade tip portion 52A (hereinafter referred to as a blade tip line 530 ) is not a straight line but is concavely curved toward the back portion 56 .

[0036] The blade tip portion 52A of the present embodiment is configured such that the entire blade tip portion 52A is configured as a curved portion 53A. In more detail, the blade tip line 530 of the curved portion 53A (blade tip portion 52A) is concavely curved in the direction of the back portion 56 in the width direction WD relative to the reference line RL of the curved portion 53A. The reference line RL is a line segment connecting the first end 531 of the curved portion 53A located on one side of the free end 516 and the second end 532 located on the opposite side (the side of the mounting portion 511) in the length direction LD. The curvature of the blade tip line 530 is substantially constant. The distance between the reference line RL in the width direction WD and the blade tip line 530 takes the maximum distance MD at the substantial center position of the curved portion 53A in the length direction LD.

[0037] In addition, from the viewpoint of improving cutting performance and durability, the maximum distance MD is set to less than 15 millimeters (mm). In addition, it is preferred that the maximum distance MD is set according to the total length EL (the distance between the first end 531 and the second end 532) of the curved portion 53A. In more detail, it is preferred that the shorter the total length EL is, the shorter the maximum distance MD is. For example, if the total length EL is greater than 100 mm and less than 200 mm, the maximum distance MD can be in the range of 0.4 to 5 mm (including 0.4 mm and 5 mm). If the total length EL is greater than 200 mm and less than 300 mm, the maximum distance MD can be in the range of 1.5 to 9 mm (including 1.5 mm and 9 mm). If the total length EL is greater than 300 mm and less than 400 mm, the maximum distance MD can be in the range of 3 to 12 mm (including 3 mm and 12 mm).

[0038] The hard tip 58 is a tip formed of a material harder than the main body 51A. The material of the hard tip 58 is not particularly limited, but for example, a superhard alloy or a metal ceramic can be suitably used. Figure 3 As shown in FIG. 1 , the hard tip 58 is smaller than the tooth 521 of the blade tip portion 52A. In the present embodiment, one hard tip 58 is joined to each of the top ends of all the teeth 521. More specifically, the hard tip 58 is joined to the same side of the top end of each tooth 521 as the mounting portion 511 in the longitudinal direction LD of the body 51A. The method of attaching the hard tip 58 to the tooth 521 is not particularly limited, but welding such as brazing is preferably used, for example.

[0039] As described above, the blade 5A of this embodiment has a blade tip portion 52A including a curved portion 53A, and all teeth 521 of the blade tip portion 52A are respectively connected to hard tips 58. With such a structure, the curved portion 53A can improve the cutting efficiency and durability of the blade 5A, and the hard tips 58 can further improve the durability. In addition, it is relatively easy to connect the hard tips 58 to the main body 51A, so that a portion with a higher hardness than the main body 51A can be efficiently formed at a desired position of the main body 51A.

[0040] <Second embodiment> The following reference Figure 4 Next, a blade 5B according to the second embodiment will be described.

[0041] The blade 5B of this embodiment differs from the blade 5A of the first embodiment only in the way the hard tip 58 is mounted relative to the body 51A. Figure 4 As shown, in the blade 5B, the hard tip 58 is not engaged on all teeth of the plurality of teeth 521 of the blade tip portion 52A, but is engaged on every other tooth. Accordingly, compared with the blade 5A of the first embodiment, the number of the hard tips 58 can be reduced, thereby reducing the manufacturing cost.

[0042] In addition, instead of the above example, the hard tip 58 may be attached to the plurality of teeth 521, for example, one per a specific number of teeth 521 (every two teeth, every three teeth, etc.). Alternatively, the hard tip 58 may be attached one by one to each tooth of a plurality of teeth 521 less than the specific number of teeth 521 (for example, three teeth 521 out of five teeth 521). Alternatively, the hard tip 58 may be attached to a specific portion of the plurality of teeth 521 that is easily consumable (for example, an end portion of the curved portion 53A close to the mounting portion 511, a central portion of the curved portion 53A, an end portion of the curved portion 53A close to the free end 516, etc.) more densely than other portions, for example, depending on the cutting object of the blade 5B.

[0043] <Third embodiment> The following reference Figure 5 A blade 5C according to a third embodiment will be described.

[0044] The blade 5C of this embodiment differs from the blade 5A of the first embodiment only in the structure of the blade tip portion 52C of the main body 51C. Figure 5 As shown, the blade tip portion 52C of this embodiment includes a plurality of tooth groups 520 repeatedly arranged in the longitudinal direction LD. Each tooth group 520 includes a plurality of teeth 521. The hard tip 58 is joined to all the teeth 521 one by one.

[0045] The blade 5C of this embodiment is a blade adopting a so-called variable pitch or a combined pitch. That is, in the blade 5C, the plurality of teeth 521 of each tooth group 520 are not arranged at equal intervals but are arranged at unequal intervals.

[0046] In more detail, each tooth group 520 includes nine teeth 521. Among the nine teeth 521, the distance (pitch) between the top of each of the first to third teeth 521 from the side close to the free end 516 (the right side of the figure) in the longitudinal direction LD and the top of the tooth 521 adjacent to the tooth 521 on the mounting portion 511 side (the left side of the figure) is the same first pitch P1. The distance (pitch) between the top of each of the fourth to fifth teeth 521 from the side close to the free end 516 and the top of the tooth 521 adjacent to the tooth 521 on the mounting portion 511 side is the same second pitch P2, which is larger than the first pitch P1. The distance (pitch) between the respective top ends of the 6th to 8th teeth 521 from the side close to the free end 516 and the top ends of the teeth 521 adjacent to the teeth 521 on the mounting portion 511 side is the same third pitch P3, which is larger than the first pitch P1 and smaller than the second pitch P2.

[0047] As described above, in the present embodiment, a pitch pattern including the first pitch P1, the second pitch P2, and the third pitch P3 that are different from each other is defined in each tooth group 520. Furthermore, a plurality of tooth groups 520 are repeatedly arranged in the longitudinal direction LD.

[0048] In addition, the pitch of the teeth 521 is sometimes expressed as the number of teeth 521 per inch (TPI). In this case, it can be said that each tooth group 520 includes three sections with the maximum TPI, the minimum TPI, and the middle TPI in order from the side close to the free end 516 in the longitudinal direction LD. For example, the TPI of the section closest to the free end 516 can be set to 14, the TPI of the section in the middle can be set to 10, and the TPI of the section farthest from the free end 516 can be set to 12.

[0049] As described above, the blade 5C of the present embodiment has an unequal pitch pattern. The unequal pitch pattern can effectively reduce the vibration and noise caused by resonance. In addition, the above-mentioned pitch pattern is only an example, and the number and / or pitch of the teeth 521 in the tooth group 520 can also be appropriately changed. In addition, the configuration of the hard tip 58 described in the second embodiment can also be combined with the structure with the unequal pitch pattern of the present embodiment.

[0050] <Fourth embodiment> The following reference Figure 6 The blade 5D involved in the fourth embodiment will be described. Figure 6 In the figure, the teeth 521 of the blade edge portion 52A are omitted, and only the blade edge line 530 is shown.

[0051] The blade 5D of this embodiment is different from the blade 5A of the first embodiment only in that the main body 51D has a hole 54. Figure 6 As shown, in the width direction WD, a plurality of holes 54 are arranged along the length direction LD between the blade tip 52A and the back 56 of the body 51D. The holes 54 are elongated in the length direction LD. These holes 54 can help improve heat dissipation and discharge of cutting powder.

[0052] In addition, the shape, number, and configuration of the holes 54 can be appropriately changed according to the cutting object, the strength of the body 51A, etc. In addition, the configuration of the hard tip 58 described in the second embodiment and / or the unequal pitch pattern described in the third embodiment can also be combined with the structure of this embodiment.

[0053] <Fifth embodiment> The following reference Figure 7 The blade 5E according to the fifth embodiment will be described. Figure 7 In FIG. 5 , the teeth 521 of the blade edge portion 52E are omitted from illustration, and only the blade edge line 530 is shown.

[0054] The blade 5E of this embodiment differs from the blade 5A of the first embodiment only in the structure of the blade tip 52E of the main body 51E. More specifically, the blade tip 52E of this embodiment includes a plurality of teeth 521 having the same height and arranged at the same pitch (equal intervals) as the first embodiment, but detailed illustration is omitted. In addition, as in the first embodiment, all teeth 521 (see Figure 3 ) are each joined with a hard tip 58 at the top end.

[0055] In addition, the blade tip portion 52E of this embodiment is different from the first embodiment and includes a plurality of curved portions 53E arranged in a row in the longitudinal direction LD. The plurality of curved portions 53E have substantially the same shape. The blade tip line 530 of each curved portion 53E is concavely curved toward the back 56 side in the width direction WD relative to the reference line RL connecting the first end 531 and the second end 532. In addition, in this embodiment, the reference lines RL of all the curved portions 53E are located on the same straight line.

[0056] Compared with the first embodiment (refer to Figure 2 ) Similarly, in the blade 5E of this embodiment, the distance between the reference line RL of each curved portion 53E in the width direction WD and the blade tip line 530 also takes the maximum distance MD at the central part of the curved portion 53E in the length direction LD. The total length EL of each curved portion 53E is about 10mm to 50mm shorter than the total length EL of the curved portion 53A of the first embodiment. Therefore, the maximum distance MD is smaller than the maximum distance MD of the curved portion 53A of the first embodiment, and is set to about 0.2mm to 5mm.

[0057] In addition, in the present embodiment, the end portion of the main body 51E along the back 56 is linear. Therefore, the distances between the top ends of at least two teeth (the first tooth and the second tooth) among the plurality of teeth 521 included in each curved portion 53E and the back 56 (more specifically, the end portion of the main body 51E along the back 56) are different from each other. In other words, the distance D1 between the top end E1 of the first tooth and the end portion along the back 56 is different from the distance D2 between the top end E2 of the second tooth and the end portion along the back 56. In addition, in Figure 7 Since detailed illustration of the teeth 521 is omitted in FIG. 5 , the tips E1 and E2 are shown as points on the blade edge line 530 .

[0058] Furthermore, in the present embodiment, the curvature of the knife tip line 530 is set to be smaller as it approaches the end of the curved portion 53E in such a manner that the knife tip line 530 of adjacent curved portions 53E is continuous in a gentle wave shape. However, the shape of the knife tip line 530 is not limited to this example and may be arbitrarily changed. In addition, a plurality of curved portions 53E may also be connected via a straight portion where the line connecting the top ends of the teeth 521 is a straight line, but this is omitted from the illustration. In addition, at least one of the configuration of the hard tip 58 described in the second embodiment, the unequal pitch pattern described in the third embodiment, and the hole 54 described in the fourth embodiment may also be combined with the structure of the present embodiment.

[0059] As described above, the blade tip portion 52E of the blade 5E of the present embodiment includes a plurality of curved portions 53E. Therefore, the position of contact with the workpiece during cutting can be easily changed, thereby effectively improving durability.

[0060] In addition, the above-mentioned embodiments are merely examples, and the blades involved in the present invention are not limited to the blades 5A, 5B, 5C, 5D, and 5E illustrated. For example, in the body of the blade, the blade tip line of at least one curved portion of the blade tip portion may be curved concavely toward the back, and the total length, width, thickness of the body, and the pitch of the teeth, the material, etc. may be appropriately changed. In addition, the shape, size, number, configuration, and material of the hard tip may also be appropriately changed.

[0061] In addition, one end of the main body in the longitudinal direction can be detachably mounted on a reciprocating saw (not limited to the reciprocating saw 1 of the above embodiment), and the structure is not limited to the above-mentioned mounting portion 511. For example, the mounting portion 511 can be appropriately changed according to the structure of the blade receiving portion 28 and / or the usage form of the blade.

[0062] For example, in Figure 8 and Fig. 9 2 shows mounting portions 511X and 511Y of blades 5X and 5Y for a reciprocating saw used with a chain vise. The chain vise is used by mounting it on the tool body of the reciprocating saw in a state where a workpiece to be cut is fixed by a chain. In this state, when the blades 5X and 5Y perform cutting work, a large load is applied to the mounting portion 511X and 511Y. Therefore, in order to ensure the required strength of the mounting portion 511X and 511Y, the mounting portion 511X and 511Y are configured to be larger than the mounting portion 511X and 511Y. Figure 2 The mounting portion 511 is shown to be wider (the parallel surfaces 515 are more widely spaced).

Claims

1. A blade for a reciprocating saw, characterized in that: having a body and at least one hard tip, wherein The main body is an elongated body, and one end of the main body in the longitudinal direction is detachably mounted on the reciprocating saw; The at least one hard tip has a higher hardness than the body and is engaged with the body, The main body includes a blade tip and a back portion, wherein the blade tip includes a plurality of teeth arranged along the length direction, and the back portion extends along the length direction on a side opposite to the blade tip in a width direction orthogonal to the length direction. The blade tip portion includes at least one curved portion, Each of the at least one curved portion is configured such that a line connecting the top ends of a plurality of teeth included in each of the at least one curved portion, i.e., a knife edge line, is curved concavely toward the back portion. The at least one hard tip is engaged to at least one tooth of the plurality of teeth.

2. A blade for a reciprocating saw, characterized in that: having a body and at least one hard tip, wherein The main body is an elongated body, and one end of the main body in the longitudinal direction is detachably mounted on the reciprocating saw; The at least one hard tip has a higher hardness than the main body and is engaged with the main body, The main body includes a blade tip and a back portion, wherein the blade tip includes a plurality of teeth arranged along the length direction, and the back portion extends along the length direction on a side opposite to the blade tip in a width direction orthogonal to the length direction. The blade tip portion includes at least one curved portion, Each curved portion of the at least one curved portion comprises at least a first tooth and a second tooth, In the width direction, the distance between the tip of the first tooth and the back is different from the distance between the tip of the second tooth and the back. The at least one hard tip is engaged to at least one tooth of the plurality of teeth.

3. The blade according to claim 1 or 2, characterized in that: Each of the at least one bent portion has a first end in the longitudinal direction and a second end located on the opposite side to the first end in the longitudinal direction. In the width direction, a maximum distance between a knife edge line, which is a line connecting the tips of a plurality of teeth included in each of the at least one curved portion, and a line segment connecting the first end and the second end is less than 15 mm.

4. The blade according to any one of claims 1 to 3, characterized in that: The blade tip portion includes a plurality of curved portions.

5. The blade according to any one of claims 1 to 4, characterized in that: The plurality of teeth of the blade tip portion include a plurality of tooth groups repeatedly arranged along the length direction, Each of the plurality of tooth groups has an unequal pitch pattern including a plurality of tooth pitches that are different from each other.

6. The blade according to any one of claims 1 to 5, characterized in that: The at least one hard tip is engaged with only a portion of the plurality of teeth of the tip portion.

7. The blade according to any one of claims 1 to 6, characterized in that: The body has at least one hole.

8. A reciprocating saw, characterized in that: The blade according to any one of claims 1 to 7, comprising a blade receiving portion and the blade mounted on the blade receiving portion, wherein: The blade receiving portion is configured to receive one end portion of the blade in a detachable manner.

9. The reciprocating saw according to claim 8, characterized in that It also has a motor and a drive mechanism, wherein: The driving mechanism is configured to be operably connected to the motor and the blade receiving portion and to cause the blade receiving portion to reciprocate in a first direction by the power of the motor. The longitudinal direction of the blade mounted on the blade receiving portion is inclined with respect to the first direction.

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