Blade for reciprocating saw and reciprocating saw

Abstract

To provide a blade for a reciprocating saw which is excellent in durability.SOLUTION: A blade for a reciprocating saw includes: a long body in which one end in a length direction of the body is removably mounted on a reciprocating saw; and at least one hard chip which has hardness higher than that of the body, and is joined to the body. The body includes: a cutting edge part including a plurality of teeth aligned in the length direction; and a back part extending in a length direction on a side opposite to the cutting edge part, in a width direction perpendicular to the length direction. The cutting edge part includes at last one curved part. Each of at least the one curved part is configured so that a cutting edge line that is a line connecting tips of the plurality of teeth included in each of at least the one curved part is curved in a recessed shape toward the back part. At least the one hard chip is joined to at least the one of the plurality of teeth.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a blade that is removably attached to and used with a reciprocating saw, and to a reciprocating saw. [Background technology]

[0002] A reciprocating saw (also called a saber saw) is a tool that cuts a workpiece by reciprocating a removable blade. Various improvements have been known to improve the durability of reciprocating saw blades. For example, Patent Document 1 discloses a blade having a cutting edge and a back portion, the cutting edge including a curved portion that curves toward the back portion, and a diamond layer formed on the curved portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6870730 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned blade, a curved portion is provided at the cutting edge, diamond particles are bonded to the entire curved portion, and a diamond layer is formed, thereby improving the durability of the blade. On the other hand, a relatively complicated process is required to form the diamond layer on the curved portion. Therefore, it is desirable to improve the durability of the blade without using a diamond layer.

[0005] In view of the above-mentioned circumstances, one non-limiting object of the present disclosure is to provide a blade for a reciprocating saw that is highly durable. [Means for solving the problem]

[0006] According to one non-limiting aspect of the present disclosure, a blade for a reciprocating saw is provided, the blade comprising an elongated body and at least one hard tip having a harderness than the body and joined to the body. One end of the body in the longitudinal direction is configured to be removably attached to the reciprocating saw. The body includes a cutting edge portion and a back portion. The cutting edge portion includes a plurality of teeth aligned in the longitudinal direction of the body. The back portion extends longitudinally on the opposite side to the cutting edge portion in a width direction perpendicular to the longitudinal direction of the body.

[0007] The cutting edge includes at least one curved portion. Each of the at least one curved portion is configured such that a cutting edge line thereof is curved concavely toward the back portion. The cutting edge line is a line connecting the tips of the teeth included in each of the at least one curved portion. The at least one hard tip is bonded to at least one of the teeth.

[0008] According to another non-limiting aspect of the present disclosure, there is provided a blade for a reciprocating saw, the blade comprising an elongated body and at least one hard tip having a harderness than the body and joined to the body. One end of the body in the length direction is configured to be removably attached to the reciprocating saw. The body includes a cutting edge portion and a back portion. The cutting edge portion includes a plurality of teeth aligned in the length direction of the body. The back portion extends in the length direction on the opposite side to the cutting edge portion in a width direction perpendicular to the length direction of the body.

[0009] The cutting edge includes at least one curved portion. Each of the at least one curved portion includes at least a first tooth and a second tooth. In a width direction of the body, a distance between a tip end and a back end of the first tooth is different from a distance between a tip end and a back end of the second tooth. The at least one hard tip is joined to at least one of the plurality of teeth.

[0010] In the above embodiment, for example, cemented carbide or cermet can be suitably used as the material of the hard tip. Typically, one hard tip is attached to one tooth. Therefore, when multiple hard tips are used, typically, the multiple hard tips are attached to the same number of teeth. The number of hard tips may be the same as the number of teeth, or may be less than the number of teeth.

[0011] The reciprocating saw blade of the above embodiment has a cutting edge including at least one curved portion, and at least one hard tip is attached to at least one of the teeth of the cutting edge. With this configuration, the curved portion improves the cutting efficiency and durability of the blade, and the hard tip can further improve durability. In addition, since it is relatively easy to selectively attach a hard tip to some or all of the teeth, a portion having a higher hardness than the main body can be efficiently formed at a desired position.

[0012] According to another non-limiting aspect of the present disclosure, there is provided a reciprocating saw including a blade receiving portion configured to removably receive one end of a blade, and the blade according to any one of the above aspects attached to the blade receiving portion. The reciprocating saw can cut a workpiece efficiently and for a long time using a blade including a cutting edge including at least one curved portion and at least one hard tip joined to at least one of the teeth of the cutting edge. [Brief description of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view of a reciprocating saw with a blade of a first embodiment attached thereto. FIG. [Diagram 2] FIG. 2 is an overall view of the blade of the first embodiment. [Diagram 3] FIG. 4 is a partially enlarged view of the cutting edge of the blade. [Figure 4] FIG. 11 is a partially enlarged view of a cutting edge portion of a blade according to a second embodiment. [Diagram 5]FIG. 11 is a partially enlarged view of a cutting edge portion of a blade according to a third embodiment. [Figure 6] FIG. 13 is an overall view of a blade according to a fourth embodiment (however, the cutting edge of the blade is illustrated in a simplified manner). [Figure 7] FIG. 13 is an overall view of a blade according to a fifth embodiment (however, the cutting edge of the blade is illustrated in a simplified manner). [Figure 8] 13A and 13B are explanatory diagrams of modified examples of the mounting portion. [Figure 9] 13 is an explanatory diagram of another modified example of the mounting portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] In a non-limiting embodiment of the present disclosure, each of the at least one curved portion of the above aspect has a first end in the length direction and a second end opposite to the first end in the length direction. In the width direction of the main body, the maximum distance between the cutting edge line and the line segment connecting the first end and the second end may be less than 15 mm. According to this embodiment, cutting efficiency and durability can be effectively improved. In addition, it is preferable that the maximum distance between the cutting edge line and the line segment connecting the first end and the second end is made smaller as the length of each curved portion in the length direction of the main body becomes smaller.

[0015] In addition to or instead of the above embodiment, the cutting edge may include a plurality of curved portions, which makes it easier to vary the position of contact with the workpiece during cutting, and is effective in improving durability.

[0016] In addition to or instead of the above embodiment, the teeth of the cutting edge may include a plurality of tooth groups repeatedly arranged in the length direction. Each of the plurality of tooth groups may have an uneven pitch pattern including a plurality of pitches different from each other. In other words, the cutting edge may adopt a so-called variable pitch or combination pitch. According to this embodiment, it is possible to reduce vibration and noise due to resonance.

[0017] In addition to or instead of the above embodiment, at least one hard tip may be attached to only some of the teeth of the cutting edge. In other words, the number of teeth to which the hard tip is attached may be less than the total number of the teeth. According to this embodiment, the number of hard tips can be reduced compared to when hard tips are attached to all of the teeth, thereby reducing manufacturing costs.

[0018] In addition to or instead of the above embodiment, the blade body may have at least one hole, which can improve the heat dissipation of the blade body and contribute to further improving durability.

[0019] In addition to or instead of the above embodiment, the reciprocating saw may further include a motor and a drive mechanism operably connected to the motor and the blade receiving portion and configured to reciprocate the blade receiving portion in a first direction by power of the motor. The length direction of the blade attached to the blade receiving portion may be inclined with respect to the first direction. According to this embodiment, for example, when cutting a tubular workpiece (e.g., a pipe), the cutting depth can be made different at two points where the blade cuts into the workpiece.

[0020] Hereinafter, non-limiting embodiments of the present disclosure will be described with reference to the drawings. In the following description of the embodiments and the drawings to which reference is made, substantially the same configurations (including cases where the shapes are slightly different) are denoted by the same reference numerals, and the description thereof will be omitted or simplified as appropriate.

[0021] First Embodiment Hereinafter, a blade 5A according to a first embodiment will be described with reference to FIGS.

[0022] The blade 5A is a cutting tool that is removably attached to an electric reciprocating saw for use. The reciprocating saw 1 shown in FIG. 1 is an example of a reciprocating saw to which the blade 5A can be attached. In addition to the blade 5A of this embodiment, a plurality of other types of blades can be selectively attached to the reciprocating saw 1. The reciprocating saw 1 is configured to cut workpieces such as wood, plastic, steel, and pipes by reciprocating the blade.

[0023] First, a brief description will be given of the reciprocating saw 1. The outer shell of the reciprocating saw 1 is formed by a tool body 11 and a handle 13 connected to the tool body 11.

[0024] The tool body 11 is a long, 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 portion 131 that is gripped by a user. The grip portion 131 extends at the rear of the tool body 11 so as to be generally perpendicular to the front-rear direction. A direction perpendicular to the long axis of the tool body 11 and corresponding to the extension direction of the grip portion 131 defines the up-down direction of the reciprocating saw 1. The grip portion 131 is provided with a trigger 133 and a switch 135. A rechargeable battery 18 can be attached to the lower end of the handle 13.

[0025] The tool body 11 accommodates a motor 21, a drive mechanism 25, and a blade receiving portion 28 therein.

[0026] The motor 21 is driven while the trigger 133 is pressed by the user and the switch 135 is turned on. The drive mechanism 25 is operably connected to the motor 21 and is 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 linear motion.

[0027] The blade receiving portion 28 is disposed within the front end portion of the tool body 11. The blade receiving portion 28 is configured to removably receive the blade and hold it in a fixed state. Although detailed illustration is omitted, the blade receiving portion 28 of this embodiment is provided with a known clamp mechanism that is widely used in various reciprocating saws. This clamp mechanism includes a holder 281 having a slot, and a lock pin 283 that is movable between a locked position where it protrudes into the slot and an unlocked position where it does not protrude into the slot.

[0028] The blade receiving portion 28 is operably connected to the drive mechanism 25 (motion conversion mechanism), and is reciprocated generally in the front-rear direction as the motor 21 is driven. This causes the blade attached to the blade receiving portion 28 to also reciprocate, and the workpiece is cut by the blade.

[0029] The detailed configuration of the blade 5A will be described below.

[0030] As shown in FIGS. 2 and 3, the blade 5A includes a body 51A and a plurality of hard tips 58 joined to the body 51A.

[0031] Main body 51A is a long, thin plate-like member having a length, width, and thickness, and is also called a substrate. Note that main body 51A that is 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.

[0032] The main body 51A is made of metal, for example, steel. One end of the main body 51A in the longitudinal direction LD is configured as an attachment part 511 that can be attached to the blade receiving part 28. The other end of the main body 51A in the longitudinal direction LD is a free end 516.

[0033] Although detailed illustration is omitted, in this embodiment, the mounting portion 511 has a size and shape that allows it to be inserted into a slot of the holder 281 of the blade receiving portion 28 (clamp mechanism). The mounting portion 511 has a pair of parallel surfaces 515 that extend parallel to each other and are spaced apart in the width direction WD of the main body 51A. The mounting portion 511 also has an engagement hole 512 into which the lock pin 283 can be fitted.

[0034] As shown in FIG. 1, when the mounting portion 511 of the blade 5A is placed in the slot, the parallel surface 515 of the mounting portion 511 is arranged along the abutment surface of the holder so as to be substantially perpendicular to the axis extending in the vertical direction. This positions the mounting portion 511 with respect to the blade receiving portion 28. When the lock pin 283 is inserted into the engagement hole 512 and locked at the lock 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 main body 11 and extends forward. Note that, in a state in which the mounting portion 511 is fixed to the blade receiving portion 28, the length direction LD of the main body 51A (long axis of the main body 51A) is inclined obliquely downward with respect to the front-rear direction of the reciprocating saw 1 (long axis of the tool main body 11) as it moves toward the front of the reciprocating saw 1.

[0035] As shown in FIG. 2, the main body 51A includes a cutting edge portion 52A and a back portion 56. The cutting edge portion 52A extends along one end of the main body 51A extending in the length direction LD between the attachment portion 511 and the free end 516. The cutting edge portion 52A is a portion for cutting the workpiece and includes a plurality of teeth 521. In this embodiment, all the teeth 521 have the same height and are arranged at the same pitch (i.e., at equal intervals). The back portion 56 extends along the other end of the main body 51A extending in the length direction LD between the attachment portion 511 and the free end 516. In other words, the back portion 56 is provided along the end opposite to the cutting edge portion 52A in the width direction WD of the main body 51A.

[0036] Cutting edge portion 52A includes curved portion 53A. Curved portion 53A refers to a portion of cutting edge portion 52A where a line connecting the tips (tooth tips) of teeth 521 (hereinafter referred to as cutting edge line 530) is not a straight line but is curved concavely toward back portion 56.

[0037] In the present embodiment, the entire cutting edge portion 52A is configured as a curved portion 53A. More specifically, the cutting edge line 530 of the curved portion 53A (cutting edge portion 52A) is curved concavely toward the back portion 56 in the width direction WD with respect 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 the side of the free end 516 in the length direction LD and the second end 532 on the opposite side (the side of the mounting portion 511). The curvature of the cutting edge line 530 is substantially constant. The distance between the reference line RL and the cutting edge line 530 in the width direction WD is a maximum distance MD at the substantial center position of the curved portion 53A in the length direction LD.

[0038] In addition, the maximum distance MD is set to less than 15 millimeters (mm) from the viewpoint of improving cutting performance and durability. Moreover, the maximum distance MD is preferably set according to the overall length EL (the distance between the first end 531 and the second end 532) of the curved portion 53A. More specifically, it is preferable to shorten the maximum distance MD as the overall length EL becomes shorter. For example, if the overall length EL is 100 mm or more and less than 200 mm, the maximum distance MD may be set within a range of 0.4 to 5 mm. If the overall length EL is 200 mm or more and less than 300 mm, the maximum distance MD may be set within a range of 1.5 to 9 mm. If the overall length EL is 300 mm or more and less than 400 mm, the maximum distance MD may be set within a range of 3 to 12 mm.

[0039] 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, cemented carbide and cermet can be preferably used. As shown in FIG. 3, the hard tip 58 is smaller than the teeth 521 of the cutting edge portion 52A. In this embodiment, one hard tip 58 is joined to the tip of each of the teeth 521. More specifically, the hard tip 58 is joined to the tip of each tooth 521 on the same side as the attachment portion 511 in the longitudinal direction LD of the main body 51A. The method of attaching the hard tip 58 to the teeth 521 is not particularly limited, but for example, welding such as brazing is preferably used.

[0040] As described above, the blade 5A of this embodiment has the cutting edge 52A including the curved portion 53A, and the hard tip 58 is joined to each of all the teeth 521 of the cutting edge 52A. With this configuration, the curved portion 53A can improve the cutting efficiency and durability of the blade 5A, and the hard tip 58 can further improve the durability. In addition, since it is relatively easy to join the hard tip 58 to the main body 51A, a portion having a higher hardness than the main body 51A can be efficiently formed at a desired position of the main body 51A.

[0041] <Second embodiment> Hereinafter, a blade 5B according to a second embodiment will be described with reference to FIG.

[0042] The blade 5B of this embodiment differs from the blade 5A of the first embodiment only in the manner in which the hard tips 58 are attached to the main body 51A. More specifically, as shown in Fig. 4, in the blade 5B, the hard tips 58 are attached to every other tooth 521 of the cutting edge 52A, rather than to all of them. This allows the number of hard tips 58 to be reduced compared to the blade 5A of the first embodiment, thereby reducing manufacturing costs.

[0043] Alternatively, instead of the above example, the hard tips 58 may be joined to the teeth 521, for example, one for every specific number of teeth 521 (every other second, every other third, etc.). Or, for every specific number of teeth 521, one hard tip 58 may be joined to each of a number of teeth 521 that is less than the specific number of teeth 521 (for example, three teeth 521 out of five teeth 521). Alternatively, for example, depending on the cutting target of the blade 5B, the hard tips 58 may be joined to specific parts of the teeth 521 that are easily worn out (for example, an end of the curved portion 53A closer to the attachment portion 511, a central part of the curved portion 53A, an end of the curved portion 53A closer to the free end 516, etc.) more densely than other parts.

[0044] <Third embodiment> Hereinafter, a blade 5C according to a third embodiment will be described with reference to FIG.

[0045] The blade 5C of this embodiment differs from the blade 5A of the first embodiment only in the configuration of the cutting edge portion 52C of the body 51C. More specifically, as shown in Fig. 5, the cutting edge 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. A hard tip 58 is joined to each of the teeth 521.

[0046] The blade 5C of the present embodiment is a blade that employs a so-called variable pitch or combination pitch. That is, in the blade 5C, the teeth 521 of each tooth group 520 are arranged at unequal intervals rather than at equal intervals.

[0047] More specifically, each tooth group 520 includes nine teeth 521. The distance (pitch) between the tip of each of the first to third teeth 521 from the side closer to the free end 516 in the longitudinal direction LD (the right side of the figure) and the tip of the tooth 521 adjacent to this tooth 521 on the attachment portion 511 side (the left side of the figure) is the same first pitch P1. The distance (pitch) between the tip of each of the fourth to fifth teeth 521 from the side closer to the free end 516 and the tip of the tooth 521 adjacent to this tooth 521 on the attachment portion 511 side is the same second pitch P2, which is larger than the first pitch P1. The distance (pitch) between the tip of each of the sixth to eighth teeth 521 from the side closer to the free end 516 and the tip of the tooth 521 adjacent to this tooth 521 on the attachment portion 511 side is the same third pitch P3, which is larger than the first pitch P1 and smaller than the second pitch P2.

[0048] Thus, in this embodiment, a pitch pattern including a first pitch P1, a second pitch P2, and a third pitch P3 that are different from one another is defined for each tooth group 520. The multiple tooth groups 520 are repeatedly arranged in the longitudinal direction LD.

[0049] The pitch of the teeth 521 may be 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 maximum, minimum, and intermediate TPIs, in order from the section closest to the free end 516 in the length direction LD. For example, the TPI of the section closest to the free end 516 can be set to 14, the TPI of the middle section to 10, and the TPI of the section farthest from the free end 516 to 12.

[0050] As described above, the blade 5C of this embodiment has a non-uniform pitch pattern. The non-uniform pitch pattern can effectively reduce vibration and noise caused by resonance. Note that the above-mentioned pitch pattern is merely an example, and the number and / or pitch of the teeth 521 in the tooth set 520 may be changed as appropriate. In addition, the arrangement of the hard tips 58 described in the second embodiment may be combined with the configuration having the non-uniform pitch pattern of this embodiment.

[0051] <Fourth embodiment> A blade 5D according to a fourth embodiment will be described below with reference to Fig. 6. Note that in Fig. 6, the teeth 521 of the cutting edge portion 52A are not shown, and only the cutting edge line 530 is shown.

[0052] The blade 5D of this embodiment differs from the blade 5A of the first embodiment only in that the main body 51D has holes 54. More specifically, as shown in Fig. 6, a plurality of holes 54 are arranged in the length direction LD between the cutting edge portion 52A and the back portion 56 of the main body 51D in the width direction WD. The holes 54 are elongated holes in the length direction LD. These holes 54 can contribute to improving heat dissipation and chip discharge.

[0053] The shape, number, and arrangement of the holes 54 may be appropriately changed depending on the cutting target, the strength of the main body 51A, etc. Also, the arrangement of the hard tips 58 described in the second embodiment and / or the uneven pitch pattern described in the third embodiment may be combined with the configuration of this embodiment.

[0054] <Fifth embodiment> Hereinafter, a blade 5E according to a fifth embodiment will be described with reference to Fig. 7. Note that in Fig. 7, the teeth 521 of the cutting edge portion 52E are not shown, and only the cutting edge line 530 is shown.

[0055] The blade 5E of this embodiment differs from the blade 5A of the first embodiment only in the configuration of the cutting edge 52E of the main body 51E. Although detailed illustration is omitted, the cutting edge 52E of this embodiment has a plurality of teeth 521 of the same height and arranged at the same pitch (equally spaced), similar to the first embodiment. Also, a hard tip 58 is joined to the tip of each of all the teeth 521 (see FIG. 3) similar to the first embodiment.

[0056] Moreover, unlike the first embodiment, the cutting edge portion 52E of this embodiment includes a plurality of curved portions 53E arranged side by side in the length direction LD. The curved portions 53E have substantially the same shape. The cutting edge line 530 of each curved portion 53E is curved concavely toward the spine 56 in the width direction WD with respect to a reference line RL connecting the first end 531 and the second end 532. In this embodiment, the reference lines RL of all the curved portions 53E are on the same straight line.

[0057] As in the first embodiment (see FIG. 2), in the blade 5E of this embodiment, the distance between the reference line RL and the cutting edge line 530 of each curved portion 53E in the width direction WD is a maximum distance MD at the center of the curved portion 53E in the length direction LD. The total length EL of each curved portion 53E is shorter than the total length EL of the curved portion 53A of the first embodiment, being approximately 10 mm to 50 mm. Therefore, the maximum distance MD is set to be smaller than the maximum distance MD of the curved portion 53A of the first embodiment, being approximately 0.2 mm to 5 mm.

[0058] In this embodiment, the end along the back portion 56 of the main body 51E is linear. Therefore, the distances between the tips of at least two (the first tooth and the second tooth) of the multiple teeth 521 included in each curved portion 53E and the back portion 56 (specifically, the end along the back portion 56 of the main body 51E) are different from each other. In other words, the distance D1 between the tip E1 of the first tooth and the end along the back portion 56 is different from the distance D2 between the tip E2 of the second tooth and the end along the back portion 56. Note that, since detailed illustration of the teeth 521 is omitted in FIG. 7, the tips E1 and E2 are illustrated as points on the cutting edge line 530.

[0059] In this embodiment, the curvature of the cutting edge line 530 is set to be smaller toward the end of the curved portion 53E so that the cutting edge lines 530 of the adjacent curved portions 53E are continuous in a gentle wave shape. However, the shape of the cutting edge line 530 is not limited to this example and may be changed arbitrarily. In addition, although not shown, the multiple curved portions 53E may be connected via a straight portion in which the line connecting the tips of the teeth 521 is a straight line. In addition, at least one of the arrangement of the hard tips 58 described in the second embodiment, the uneven pitch pattern described in the third embodiment, and the holes 54 described in the fourth embodiment may be combined with the configuration of this embodiment.

[0060] As described above, the cutting edge 52E of the blade 5E of this embodiment includes a plurality of curved portions 53E, which makes it easier to vary the position at which the blade 5E comes into contact with the workpiece during cutting, which is effective in improving durability.

[0061] It should be noted that the above embodiment is merely an example, and the blade according to the present disclosure is not limited to the illustrated blades 5A, 5B, 5C, 5D, and 5E. For example, it is sufficient for the blade body to have at least one curved portion of the cutting edge curved concavely toward the back, and the overall length, width, thickness, tooth pitch, material, etc. of the body can be appropriately changed. In addition, the shape, size, number, arrangement, and material of the hard tip can also be appropriately changed.

[0062] Furthermore, it is sufficient that one end of the length direction of the main body is removably attachable to a reciprocating saw (not limited to the reciprocating saw 1 of the above embodiment), and the configuration is not limited to the above-mentioned attachment portion 511. For example, the attachment portion 511 can be appropriately changed depending on the configuration of the blade receiving portion 28 and / or the usage mode of the blade.

[0063] For example, Fig. 8 and Fig. 9 respectively show mounting parts 511X and 511Y of blades 5X and 5Y for a reciprocating saw used together with a chain vice. The chain vice is attached to the tool body of the reciprocating saw with the workpiece to be cut secured by the chain. When cutting work is performed with the blades 5X / 5Y in this state, a large load is applied to the mounting parts 511X / 511Y. Therefore, in order to ensure the necessary strength, the mounting parts 511X / 511Y are configured to be wider (the distance between the parallel surfaces 515 is wider) than the mounting part 511 shown in Fig. 2. [Explanation of symbols]

[0064] 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 receiver, 281: Holder, 283: Lock pin, 51A, 51C, 51D, 5 1E: main body, 511, 511X, 511Y: mounting portion, 512: engagement hole, 515: parallel surface, 516: free end, 52A, 52C, 52E: cutting edge portion, 520: teeth group, 521: teeth, 53A, 53E: curved portion, 530: cutting edge line, 531: first end, 532: second end, 54: hole, 56: back portion, 58: hard tip, EL: total length of curved portion, RL: reference line

Claims

1. A blade for a reciprocating saw, An elongated main body, one end of which in a longitudinal direction is configured to be removably attached to the reciprocating saw; at least one hard tip having a harder hardness than the body and joined to the body; The main body includes a cutting edge portion including a plurality of teeth arranged in the longitudinal direction, and a back portion extending in the longitudinal direction on the opposite side to the cutting edge portion in a width direction perpendicular to the longitudinal direction, The cutting edge includes at least one curved portion, Each of the at least one curved portion is configured such that a cutting edge line, which is a line connecting tips of a plurality of teeth included in each of the at least one curved portion, is curved concavely toward the back portion, The blade, wherein the at least one hard tip is bonded to at least one of the plurality of teeth.

2. A blade for a reciprocating saw, An elongated main body, one end of which in a longitudinal direction is configured to be removably attached to the reciprocating saw; at least one hard tip having a harder hardness than the body and joined to the body; The main body includes a cutting edge portion including a plurality of teeth arranged in the longitudinal direction, and a back portion extending in the longitudinal direction on the opposite side to the cutting edge portion in a width direction perpendicular to the longitudinal direction, The cutting edge includes at least one curved portion, Each of the at least one curved portion includes at least a first tooth and a second tooth; In the width direction, a distance between a tip of the first tooth and the back portion and a distance between a tip of the second tooth and the back portion are different from each other, The blade, wherein the at least one hard tip is bonded to at least one of the plurality of teeth.

3. A blade according to claim 1 or 2, Each of the at least one curved portion has a first end in the length direction and a second end opposite the first end in the length direction; A blade characterized in that in the width direction, a maximum distance between the cutting edge line and a line segment connecting the first end and the second end is less than 15 mm.

4. A blade according to any one of claims 1 to 3, The blade is characterized in that the cutting edge portion includes a plurality of curved portions.

5. A blade according to any one of claims 1 to 4, The plurality of teeth of the cutting edge portion include a plurality of groups of teeth repeatedly arranged in the longitudinal direction, Each of the plurality of teeth has a non-uniform pitch pattern including a plurality of different pitches.

6. A blade according to any one of claims 1 to 5, A blade, characterized in that the at least one hard tip is joined to only a portion of the plurality of teeth of the cutting edge portion.

7. A blade according to any one of claims 1 to 6, The blade, wherein the body has at least one hole.

8. a blade receiving portion configured to removably receive one end of the blade; A reciprocating saw comprising the blade according to any one of claims 1 to 7 attached to the blade receiving portion.

9. 9. A reciprocating saw according to claim 8, A motor; a drive mechanism operably connected to the motor and the blade receiving portion and configured to reciprocate the blade receiving portion in a first direction by power of the motor; A reciprocating saw, characterized in that the longitudinal direction of the blade attached to the blade receiving portion is inclined with respect to the first direction.

Images