Blade assembly and tool including blade assembly

Abstract

The present invention discloses a blade assembly and a tool including the blade assembly. The blade assembly includes: a first blade and a second blade, both of which extend along the length direction of the blade assembly, with a first edge portion and a third edge portion respectively provided on both sides of the first blade in the width direction; a second edge portion and a fourth edge portion respectively provided on both sides of the second blade in the width direction; a connecting assembly, which stacks and connects the first and second blades in a manner that allows the first and second blades to reciprocate relative to each other along the length direction; wherein the first and second edge portions are constructed to cooperate with each other to have a first working function, and the third and fourth edge portions are constructed to cooperate with each other to have a second working function different from the first working function. The blade assembly and tool of the present invention enable multiple working functions such as sawing and pruning to be achieved without replacing the work executing parts.

Description

Technical Field

[0001] The present invention relates to a blade assembly and a tool comprising the blade assembly, in particular to a multifunctional tool with different functions such as sawing and pruning and the blade assembly thereof. Background Art

[0002] Tools such as pruning shears and reciprocating saws driven by power mechanisms (such as motors, engines or pneumatic devices) have been widely used. The common feature of these tools is that they have working parts that can move back and forth in a straight line or swing back and forth and are in direct contact with branches or grass to be processed.

[0003] Most tools currently on the market (such as pruning shears and reciprocating saws) only have one set of working parts to complete a single task. The advantages of this are simple tool structure, light weight, and low manufacturing cost per tool. However, the disadvantage is that it is not convenient for users to work. Sometimes, working in the same place requires using multiple tools with different purposes to complete the work effectively.

[0004] At the same time, some tools on the market now come with multiple workpieces. During use, users can change the use of the tool by replacing the workpiece according to the nature of their work. For example, the tool with a reciprocating motion platform disclosed in CN205584860U belongs to this category. The advantage of this tool is that the user's work is more convenient. With just one tool, they can basically complete all the work in a specific location. However, the disadvantage of this tool is that it is relatively complex in structure, the cost of each tool is relatively high, and it is heavy. In addition, the user has to disassemble and assemble the workpiece during use, which also requires certain user skills. Summary of the Invention

[0005] The object of the present invention is to provide a multi-purpose double-blade workpiece, thereby producing a multi-purpose tool that does not require replacement of the workpiece, making it convenient for users to complete multiple tasks such as pruning and sawing with one tool.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a blade assembly is provided, which includes: a first blade and a second blade, the first blade and the second blade both extending along the length direction of the blade assembly, and a first cutting edge portion and a third cutting edge portion are respectively provided on opposite sides in the width direction of the first blade; and a second cutting edge portion and a fourth cutting edge portion are respectively provided on opposite sides in the width direction of the second blade; and a connecting assembly, which stacks and connects the first blade and the second blade in a manner allowing the first blade and the second blade to reciprocate relative to each other along the length direction; wherein the first cutting edge portion of the first blade and the second cutting edge portion of the second blade are configured to cooperate with each other to have a first working function, and the third cutting edge portion of the first blade and the fourth cutting edge portion of the second blade are configured to cooperate with each other to have a second working function different from the first working function.

[0007] In some embodiments, the first blade portion includes saw teeth arranged at a first interval along the length direction, the second blade portion includes saw teeth arranged at a second interval along the length direction, and the first blade portion and the second blade portion cooperate with each other to realize a sawing function as the first working function; and the third blade portion includes scissor teeth arranged at a third interval along the length direction, the fourth blade portion includes scissor teeth arranged at a fourth interval along the length direction, and the third blade portion and the fourth blade portion cooperate with each other to realize a trimming function as the second working function.

[0008] In some embodiments, m first long holes are arranged along the length direction on the first blade, where m is an integer greater than or equal to 1, and each first long hole extends along the length direction and penetrates the first blade along the thickness direction of the first blade; m second long holes corresponding to the m first long holes are arranged along the length direction on the second blade, respectively, and each second long hole extends along the length direction and penetrates the second blade along the thickness direction of the second blade; and the connecting assembly includes m connecting parts, each connecting part is installed on the corresponding first long hole and second long hole in a manner that allows the first blade and the second blade to reciprocate relative to each other along the length direction.

[0009] In some embodiments, each connecting component includes a connecting rod and a first cap-shaped head and a second cap-shaped head connected to both ends of the connecting rod, wherein the connecting rod passes through the corresponding first long hole and the second long hole, the inner end surface of the first cap-shaped head facing the second blade is buckled on the outer side of the first blade away from the second blade, and the inner end surface of the second cap-shaped head facing the first blade is buckled on the outer side of the second blade away from the first blade.

[0010] In some embodiments, the first long hole is a stepped hole, and is composed of a narrow hole portion with a smaller size in the width direction of the blade assembly and a wide hole portion located on the outside of the narrow hole portion away from the second blade and with a larger size in the width direction of the blade assembly; the second long hole is a stepped hole, and is composed of a narrow hole portion with a smaller size in the width direction of the blade assembly and a wide hole portion located on the outside of the narrow hole portion away from the first blade and with a larger size in the width direction of the blade assembly; and each connecting component includes a connecting rod and a first cap-shaped head and a second cap-shaped head connected to both ends of the connecting rod, and the connecting rod passes through the corresponding first The narrow hole part of the long hole and the narrow hole part of the corresponding second long hole, the first cap-shaped head is placed in the wide hole part of the corresponding first long hole and the inner end face of the first cap-shaped head facing the second blade is buckled on the bottom surface of the wide hole part of the corresponding first long hole, and the outer end face of the first cap-shaped head away from the second blade does not exceed the outer side face of the first blade away from the second blade; the second cap-shaped head is placed in the wide hole part of the corresponding second long hole and the inner end face of the second cap-shaped head facing the first blade is buckled on the bottom surface of the wide hole part, and the outer end face of the second cap-shaped head away from the first blade does not exceed the outer side face of the second blade away from the first blade.

[0011] In some embodiments, m first long holes are arranged along the length direction on the first blade, where m is an integer greater than or equal to 1, and each first long hole extends along the length direction and penetrates the first blade along the thickness direction of the first blade; and the connecting assembly includes m connecting parts, each connecting part is installed in the corresponding first long hole in a manner that can slide relative to the first blade, and one end of each connecting part is riveted to the second blade.

[0012] In some embodiments, each connecting component includes a connecting rod, a rivet portion connected to one end of the connecting rod and riveted to the second blade, and a first cap-shaped head connected to the other end of the connecting rod, wherein the connecting rod passes through the corresponding first long hole, and the inner end surface of the first cap-shaped head facing the second blade is buckled on the outer side surface of the first blade away from the second blade.

[0013] In some embodiments, the first long hole is a stepped hole and consists of a narrow hole portion having a smaller size in the width direction of the blade assembly and a wide hole portion located on the outside of the narrow hole portion away from the second blade and having a larger size in the width direction of the blade assembly; and each connecting component includes a connecting rod, a rivet portion connected to one end of the connecting rod and riveted to the second blade, and a first cap-shaped head connected to the other end of the connecting rod, wherein the connecting rod passes through the narrow hole portion of the corresponding first long hole, the first cap-shaped head is placed in the wide hole portion of the corresponding first long hole and the inner end surface of the first cap-shaped head facing the second blade is buckled on the bottom surface of the wide hole portion of the corresponding first long hole, and the outer end surface of the first cap-shaped head away from the second blade does not exceed the outer side surface of the first blade away from the second blade.

[0014] In some embodiments, n third long holes are further arranged on the first blade along the length direction, where n is an integer greater than or equal to 1, and each third long hole extends along the length direction and penetrates the first blade along the thickness direction of the first blade; n fourth long holes corresponding to the n third long holes are further arranged on the second blade along the length direction, and each fourth long hole extends along the length direction and penetrates the second blade along the thickness direction of the second blade; a transmission mating portion is respectively provided at one end of the first blade and the second blade in the length direction; and the connecting assembly further includes The invention also provides a fuselage end connection component, which is closer to the transmission mating part relative to the connection part. The fuselage end connection component includes a fixing plate, a gasket, n bolts, n nuts and n washers, wherein each washer is installed in the corresponding third long hole and fourth long hole, the thickness of each washer is greater than the total thickness of the first blade and the second blade stacked together, the fixing plate and the gasket are arranged to clamp the first blade and the second blade stacked together and the n washers in the middle, and each bolt passes through the fixing plate, the gasket and the corresponding washer to engage with the corresponding nut.

[0015] In some embodiments, the tooth edge of each saw tooth of the first blade portion and the tooth edge of each saw tooth of the second blade portion are inclined in opposite directions relative to the length direction.

[0016] In some embodiments, the tooth edge of each saw tooth of the first blade portion and the tooth edge of each saw tooth of the second blade portion are inclined in the same direction relative to the length direction.

[0017] In some embodiments, the first interval is smaller than the third interval and smaller than the fourth interval, and the second interval is smaller than the third interval and smaller than the fourth interval.

[0018] In some embodiments, a convex surface is arranged on at least one of the mutually opposing side surfaces of the first blade and the second blade.

[0019] According to another aspect of the present invention, a tool comprising the above blade assembly is provided, wherein the tool comprises a drive mechanism for driving the first blade and the second blade to reciprocate relative to each other along the length direction.

[0020] In some embodiments, the driving mechanism includes a dual-cam driving block, the center of which is connected to the power output element of the tool, and the dual-cam driving block has two staggered cams that respectively cooperate with the transmission cooperation part of the first blade and the transmission cooperation part of the second blade.

[0021] In some embodiments, the two cams of the dual-cam driving block are offset by 180°.

[0022] The first edge portion of the first blade and the second edge portion of the second blade of the blade assembly of the present invention are constructed to cooperate with each other to have a first working function, and the third edge portion of the first blade and the fourth edge portion of the second blade are constructed to cooperate with each other to have a second working function different from the first working function. Therefore, without replacing the work executing parts, multiple functions such as sawing and trimming can be realized, realizing multiple uses of one machine, and also having the advantages of simple structure and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a perspective view showing the overall structure of a tool according to a first embodiment of the present invention;

[0024] Figure 2 is an exploded perspective view showing the structure of a blade assembly according to a first embodiment of the present invention;

[0025] Figure 3A is a side sectional view and a partially enlarged view showing a blade assembly according to a first embodiment of the present invention, and Figure 3B is a top view showing a blade assembly according to a first embodiment of the present invention;

[0026] Figure 4A is a side sectional view and a partially enlarged view showing a blade assembly according to a second embodiment of the present invention, and Figure 4B is a top view showing a blade assembly according to a second embodiment of the present invention;

[0027] Figure 5A is a side sectional view and a partially enlarged view showing a blade assembly according to a third embodiment of the present invention, and Figure 5Bis a top view showing a blade assembly according to a third embodiment of the present invention; and

[0028] Figure 6A is a side sectional view and a partially enlarged view showing a blade assembly according to a fourth embodiment of the present invention, and Figure 6B is a plan view showing a blade assembly according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0029] Below, the specific embodiment of the present invention is described in conjunction with the accompanying drawings. In all the drawings, similar components and structures are represented by similar reference numerals.

[0030] First embodiment

[0031] Figure 1 FIG. 2 shows the overall structure of a tool according to a first embodiment of the present invention. Figure 1 As shown, the tool is a portable tool and is mainly composed of a blade assembly 2 and a body 1. The body 1 mainly includes a handle portion 11 and a housing portion 12. Among them, a trigger and other switch control components are provided on the handle portion 11. A driving mechanism (not shown) for driving the blade assembly 2 and a power machine (not shown) for providing power to the driving mechanism are provided in the housing portion 12. The power machine can be a motor, an engine or a pneumatic motor, etc. When the power machine is a motor, a battery (such as a storage battery or a dry cell) for powering the motor is also provided in the body 1. The blade assembly 2 is connected to the driving mechanism in the housing portion 12. As shown Figure 1 As shown, the length direction of the blade assembly 2 is also the length direction of the entire tool.

[0032] Figure 2 is an exploded perspective view showing the structure of the blade assembly 2 according to the first embodiment. Figure 3A and Figure 3B They are respectively a side sectional view and a top view of the blade assembly 2 according to the first embodiment. Figure 2 、 Figure 3A and Figure 3B Also shown is a dual cam drive block 29 as part of the drive mechanism. Figure 2 、 Figure 3A and Figure 3B As shown, the blade assembly 2 includes a first blade 24, a second blade 23 and a connecting assembly. The first blade 24 and the second blade 23 are both roughly long strip-shaped plate components, and are both along the length direction of the blade assembly 2 (i.e. Figure 3A and Figure 3BIn other words, the length direction of the blade assembly 2 is also the length direction of the first blade 24 and the second blade 23. The connecting assembly (to be described in detail below) stacks and connects the first blade 24 and the second blade 23 in a manner that allows the first blade 24 and the second blade 23 to reciprocate relative to each other along the length direction of the blade assembly 2. It should be understood by those skilled in the art that the "stacked" mentioned here is not limited to the thickness direction (i.e., the length direction) of the first blade 24 and the second blade 23. Figure 3A The invention also includes the case where the side surfaces facing each other in the up-down direction in the first blade 24 and the second blade 23 (the inner side surfaces relative to the blade assembly 2) are in complete contact, the case where the side surfaces facing each other of the first blade 24 and the second blade 23 are only partially in contact, and the case where the side surfaces facing each other of the first blade 24 and the second blade 23 are separated by a certain distance.

[0033] like Figure 2 and Figure 3B As shown, the first blade 24 has a first edge portion 241 and a third edge portion 243 integrally formed on opposite sides in the width direction, and the second blade 23 has a second edge portion 232 and a fourth edge portion 234 integrally formed on opposite sides in the width direction. When the first blade 24 and the second blade 23 in the blade assembly 2 are stacked on each other, the first edge portion 241 of the first blade 24 is arranged on a side corresponding to the second edge portion 232 of the second blade 23 ( Figure 3B The third edge portion 243 of the first blade 24 is arranged on a side corresponding to the fourth edge portion 234 of the second blade 23 ( Figure 3B The upper side of the blade assembly 2). The first blade portion 241 and the second blade portion 232 are respectively a set of continuous saw teeth extending along the length direction of the blade assembly 2, and the third blade portion 243 and the fourth blade portion 234 are respectively a set of non-continuous scissor teeth (also called shearing teeth) extending along the length direction of the blade assembly 2. Therefore, when the first blade 24 and the second blade 23 are driven by the drive mechanism to reciprocate relative to each other along the length direction of the blade assembly 2, the first blade portion 241 and the second blade portion 232 can cooperate with each other to have a sawing operation function, and the third blade portion 243 and the fourth blade portion 234 can cooperate with each other to have a pruning (also called pruning) operation function. Thereby, the tool equipped with the blade assembly 2 according to this embodiment can simultaneously serve as a dual-blade reciprocating saw and a reciprocating pruning shear. The user does not need to replace the blade assembly 2 and can complete both pruning and sawing tasks with only one tool, which greatly facilitates the user.

[0034] The saw teeth of the first blade 241 and the second blade 232 can be any saw teeth suitable for performing sawing operations. Figure 2 and Figure 3B As shown, each serration of the first blade portion 241 is formed by a tooth close to the fuselage side ( Figure 3B The right side of the blade assembly 2 (hereinafter also referred to as the "body side") is substantially parallel to the straight edge of the width direction of the first blade 24 and the side of the blade head close to the blade assembly 2 ( Figure 3B The left side of the blade portion 232 (hereinafter also referred to as the "head side") is composed of a tooth edge (or cutting edge) inclined in the width direction of the first blade 24, and a first interval D1 is provided between adjacent teeth. Each saw tooth of the second cutting edge portion 232 is composed of a straight edge on the head side that is substantially parallel to the width direction of the second blade 23 and a tooth edge on the body side, and a second interval D2 is provided between adjacent teeth.

[0035] When the first blade 24 and the second blade 23 are mounted together, the tooth edge of each saw tooth of the first blade portion 241 and the tooth edge of each saw tooth of the second blade portion 232 are inclined in opposite directions relative to the length direction. For example, the tooth edge of the first blade portion 241 is inclined toward the blade head side, and the tooth edge of the second blade portion 232 is inclined toward the body side.

[0036] In this way, when the blade assembly 2 is working, one of the first blade portion 241 and the second blade portion 232 is always actively sawing, while the other blade portion and the blade portion that is actively sawing can produce a shearing effect on the workpiece being sawed. According to material mechanics, the tensile stress of a material is generally greater than its shearing stress, so this shearing effect of the first blade portion 241 and the second blade portion 232 can complete the sawing work more easily. In addition, the first blade 24 and the second blade 23 reciprocate relative to each other, so the sawing efficiency of the blade assembly 2 with a double-blade structure is much higher than that of a single blade, and the vibration is much smaller than that of a single blade. This is because the feed rate of the active sawing blade is limited by the other blade, so the working resistance is relatively stable, and the vibration of the internal system of the tool can be partially offset by the reciprocating motion of the two blades.

[0037] It should be understood by those skilled in the art that, according to specific usage requirements, when the first blade 24 and the second blade 23 are installed together, the tooth edge of each saw tooth of the first blade portion 241 and the tooth edge of each saw tooth of the second blade portion 232 can also be designed to be inclined in the same direction relative to the length direction; or, each saw tooth of the first blade portion 241 and the second blade portion 232 can also be formed into an isosceles triangle shape, and the two equal sides of the isosceles triangle are formed as tooth edges.

[0038] The third cutting edge 243 is a set of discontinuous teeth extending along the length of the first blade 24. Each tooth is shaped like an isosceles triangle with an acute apex angle. Adjacent teeth are separated by a flat portion, and a third spacing D3 is provided between adjacent teeth. Furthermore, the fourth cutting edge 234 is a set of discontinuous teeth extending along the length of the second blade 23. Each tooth is shaped like a strip with an enlarged end. Adjacent teeth are separated by a flat portion, and a fourth spacing D4 is provided between adjacent teeth. The first spacing D1 is smaller than the third spacing D3 and smaller than the fourth spacing D4, and the second spacing D2 is smaller than the third spacing D3 and smaller than the fourth spacing D4. In this embodiment, the second spacing D2 is slightly larger than the first spacing D1, and spacing D3 is equal to spacing D4.

[0039] It should be understood by those skilled in the art that, for example, although in the above-mentioned embodiment, the first blade portion and the second blade portion are continuous saw teeth, and the third blade portion and the fourth blade portion are discontinuous scissor teeth, the first blade portion, the second blade portion, the third blade portion and the fourth blade portion may also have other structures, as long as they cooperate with each other to achieve different working functions. In addition, the saw teeth, scissor teeth and blades in the blade assembly may all adopt shapes different from those shown in the embodiments and the accompanying drawings. Those skilled in the art can design each blade portion according to actual needs, and various designs are feasible as long as the corresponding blade portions cooperate to achieve different working functions.

[0040] In addition, a protruding surface 231 is arranged along the length direction on at least one of the side surfaces of the first blade 24 and the second blade 23 that are opposite to each other. Figure 2 As shown, there are three protruding surfaces 231, which protrude from the side (inner side) of the second blade 23 facing the first blade 24 toward the first blade 24. The protruding surfaces 231 can ensure that the sides of the first blade 24 and the second blade 23 facing each other always maintain a predetermined gap, thereby preventing the saw teeth or scissor teeth from colliding with each other due to vibration or the like when the first blade 24 and the second blade 23 reciprocate relative to each other.

[0041] Each of the first blade 24 and the second blade 23 is located at one end ( Figure 2 and Figure 3A The right end of the body (hereinafter referred to as the "body end") is integrally formed with a transmission matching portion 260 that matches the drive mechanism. Figure 2 As shown, the transmission engaging portion 260 is a plate-shaped member with a waist-shaped hole in the center. The transmission engaging portion 260 is used to engage with the double cam drive block 29 described below to make the first blade 24 and the second blade 23 reciprocate relative to each other along the length direction.

[0042] The connection assembly of the blade assembly 2 includes a body-end connection assembly close to the body 1 (i.e., close to the transmission engagement portion 260) in the longitudinal direction of the blade assembly 2 and a cutter head-end connection assembly closer to the cutter head relative to the body-end connection assembly. In this embodiment, the cutter head-end connection assembly includes two connection components (connection pins) 25a. Figure 3A As shown in the partially enlarged cross-sectional view in the upper left corner, each connecting component 25a includes a connecting rod 253a and a first cap-shaped head 251a and a second cap-shaped head 252a integrally connected to the two ends of the connecting rod 253a. The two cap-shaped heads 251a, 252a have a substantially trapezoidal cross-sectional shape that is symmetrical to each other. It will be understood by those skilled in the art that the distance between the two cap-shaped heads 251a, 252a is slightly larger than the total thickness of the first blade 24 and the second blade 23 stacked together (including the height of the protruding surface 231 protruding from the second blade 23), thereby limiting the movable gap between the first blade 24 and the second blade 23 to avoid hindering the relative movement between the first blade 24 and the second blade 23. As shown in FIG. Figure 2 and Figure 3A As shown, two first elongated holes 246a are arranged along the length of the first blade 24, corresponding to the two connecting parts 25a. Each first elongated hole 246a extends along the length of the first blade 24 and penetrates the first blade 24 in the thickness direction of the first blade 24. Each first elongated hole 246a is formed into a spoon-like (or key-like) shape, formed by combining a large-diameter expanded hole 246ak on the blade side and an elongated hole 246ac on the body side. Simultaneously, two second elongated holes 236a, corresponding to the two first elongated holes 246a, are arranged along the length of the second blade 23. Each second elongated hole 236a extends along the length of the second blade 23 and penetrates the second blade 23 in the thickness direction of the second blade 23. The second elongated hole 236a is formed into a spoon-like shape, formed by combining a large-diameter expanded hole 236ak on the body side and an elongated hole 236ac on the blade side. In addition, the diameters of the expanded hole portion 246ak of the first long hole 246a and the expanded hole portion 236ak of the second long hole 236a are slightly larger than the diameters of the first hat-shaped head 251a and the second hat-shaped head 252a, respectively, and the dimensions of the long hole portions of the first long hole 246a and the second long hole 236a in the width direction are smaller than the diameters of the first hat-shaped head 251a and the second hat-shaped head 252a and slightly larger than the diameter of the connecting rod 253a.

[0043] When installing the connecting member 25a, the reaming portion 246ak of the first long hole 246a on the first blade 24 is aligned with the reaming portion 236ak of the corresponding second long hole 236a on the second blade 23. Then, the connecting member 25a is passed through the reaming portion 246ak and the reaming portion 236ak, and then the first blade 24 is moved relative to the second blade 23 in the longitudinal direction, so that the connecting rod 253a of the connecting member 25a slides to a position located in the long hole portion 246ac of the first long hole 246a and the long hole portion 236ac of the second long hole 236a. At this time, the inner end surface ( Figure 3A The lower end surface of the first cap-shaped head 251a is buckled on the outer side surface of the first blade 24 away from the second blade 23 ( Figure 3A The connecting member 25a is connected to the upper side of the first blade 24 in the saw blade 23, and accordingly, the inner end surface of the second cap-shaped head portion 252a, which faces the first blade 24, is engaged with the outer side surface of the second blade 23, which faces away from the first blade 24. In this manner, the connecting member 25a connects the first blade 24 and the second blade 23 together, while allowing the first blade 24 and the second blade 23 to reciprocate relative to each other in the longitudinal direction and preventing the first blade 24 and the second blade 23 from separating excessively during operation. Furthermore, because the inner end surfaces of the first cap-shaped head portion 251a and the second cap-shaped head portion 252a of the connecting member 25a are engaged with the outer sides of the first blade 24 and the second blade 23, respectively, the first cap-shaped head portion 251a protrudes entirely from the outer side surface of the first blade 24, and the second cap-shaped head portion 252a protrudes entirely from the outer side surface of the second blade 23. This structure has the advantages of simple manufacturing and high blade strength, and is suitable for working environments where the entire blade assembly does not need to pass through the saw kerf or where the saw kerf naturally opens during sawing. For example, the cutter head end connection assembly according to this embodiment can be used in a high-branch saw. This is because after the branch is sawn, the saw cut will continue to open under the action of the branch's own gravity, and will not cause obstruction to the cap-shaped head of the connecting part 25a.

[0044] The fuselage end connection assembly includes a fixing plate 21, a bolt 22, a washer 26, a gasket 27, and a nut 28. Figure 2As shown, the number of bolts 22, washers 26, and nuts 28 is two each. Accordingly, two third elongated holes 248 are arranged along the length of the first blade 24. Each third elongated hole 248 extends along the length and penetrates the first blade 24 along its thickness. Two fourth elongated holes 238 are arranged along the length of the second blade 23, corresponding to the two third elongated holes 248. Each fourth elongated hole 238 extends along the length and penetrates the second blade 23 along its thickness. A washer 26 is installed in each third elongated hole 248 and the corresponding fourth elongated hole 238. The thickness of each washer 26 is greater than the total thickness of the stacked first and second blades 24, 23, thereby defining a clearance between the first and second blades 24, 23. The fixing plate 21 serves as the mounting base for the blade assembly 2 and also serves as the fixed connection plate between the blade assembly 2 and the body 1. The fixing plate 21 and gasket 27 are arranged to sandwich the stacked first and second blades 24, 23, and two washers 26. The fixing plate 21 and gasket 27 are each provided with two through-holes for the passage of bolts 22. Each bolt 22 extends through a through-hole in the fixing plate 21, a corresponding washer 26, and a through-hole in the gasket 27, thereby engaging with a corresponding nut 28. Nuts 28 are preferably self-locking nuts. This allows the fuselage-end connection assembly to reciprocate the first and second blades 24, 23 relative to each other in the longitudinal direction while simultaneously connecting and stacking the first and second blades 24, 23.

[0045] like Figure 2 As shown, the driving mechanism for driving the first blade 24 and the second blade 23 to reciprocate relative to each other along the length direction of the blade assembly 2 includes a double cam driving block 29. The center of the double cam driving block 29 is connected to a power output element (not shown) such as a driving gear. The double cam driving block 29 has a cam shaft 291 and an upper cam 292 and a lower cam 293 formed on the cam shaft 291 in a staggered manner. In other words, Figure 3B As shown, the upper cam 292 and the lower cam 293 protrude in different directions. Preferably, the upper cam 292 and the lower cam 293 are displaced 180 degrees from each other. When the dual cam drive block 29 is installed in the transmission mating portion 260, the upper cam 292 cooperates with the inner side surface of the kidney-shaped hole of the transmission mating portion of the first blade 24, and the lower cam 293 cooperates with the inner side surface of the kidney-shaped hole of the transmission mating portion of the second blade 23. When the power machine is started, the power output element connected to the power machine drives the dual cam drive block 29 to rotate, so that the upper cam 292 and the lower cam 293 drive the first blade 24 and the second blade 23 to make a displaced reciprocating motion relative to each other along the length direction of the blade assembly 2.

[0046] Second embodiment

[0047] Reference below Figure 4A and Figure 4B The second embodiment of the present invention will be described. The blade assembly in the second embodiment is similar to that in the first embodiment, and the same parts as those in the first embodiment will not be described again in the following.

[0048] like Figure 4A and Figure 4B As shown, in this embodiment, the first elongated hole 246b is a stepped hole and is composed of a narrow hole portion 2461b having a smaller dimension in the width direction of the blade assembly 2, and a wide hole portion 2462b located on the outer side of the narrow hole portion 2461b, away from the second blade 23, and having a larger dimension in the width direction of the blade assembly 2. Similarly, the second elongated hole 236b is also a stepped hole and is composed of a narrow hole portion 2361b having a smaller dimension in the width direction of the blade assembly 2, and a wide hole portion 2362b located on the outer side of the narrow hole portion 2361b, away from the first blade 24, and having a larger dimension in the width direction of the blade assembly 2. Preferably, the narrow hole portions 2461b and 2361b are formed into a spoon-like shape composed of a wide hole portion and an elongated hole portion as described above, and the wide hole portions 2462b and 2362b are formed into a waist-like shape.

[0049] In this embodiment, each connecting member 25b includes a connecting rod 253b and a first cap-shaped head portion 251b and a second cap-shaped head portion 252b integrally connected to both ends of the connecting rod 253b. During installation, similar to the connecting member 25a of the first embodiment, the connecting member 25b is first passed through the aligned expanded portion of the narrow hole portion 2461b and the expanded portion of the narrow hole portion 2361b. Subsequently, the first blade 24 is moved relative to the second blade 23 in the longitudinal direction, thereby sliding the connecting rod 253b of the connecting member 25b to a position within the narrow hole portion 2461b of the corresponding first long hole 246b and the narrow hole portion 2361b of the corresponding second long hole 236b. At this time, the first cap-shaped head portion 251b is placed in the wide hole portion 2462b of the corresponding first long hole 246b, the inner end surface of the first cap-shaped head portion 251b facing the second blade 23 is buckled on the bottom surface of the wide hole portion 2462b of the corresponding first long hole 246b, and the outer end surface of the first cap-shaped head portion 251b away from the second blade 23 does not exceed (is lower than or is flush with) the outer side surface of the first blade 24 away from the second blade 23. Similarly, the second cap-shaped head portion 252b is placed in the wide hole portion 2362b of the corresponding second long hole 236b, the inner end surface of the second cap-shaped head portion 252b facing the first blade 24 is buckled on the bottom surface of the wide hole portion 2362b, and the outer end surface of the second cap-shaped head portion 252b away from the first blade 24 does not exceed the outer side surface of the second blade 23 away from the first blade 24. Preferably, both the inner and outer end surfaces of the first cap-shaped head 251b and the inner and outer end surfaces of the second cap-shaped head 252b are flat surfaces. In the tool-end connection assembly, the outer end surfaces of the cap-shaped heads 251b and 252b of the connecting component 25b do not extend beyond the outer surfaces of the corresponding blades 23 and 24, thus preventing interference between the connecting component and the workpiece during trimming and sawing. This structure offers the advantage of wide adaptability and compatibility with sawing operations in all situations.

[0050] Third embodiment

[0051] Reference below Figure 5A and Figure 5B The blade assembly in the third embodiment is similar to that in the first embodiment, and the same parts as those in the first embodiment will not be described again below.

[0052] like Figure 5A and Figure 5BAs shown, in this embodiment, two first elongated holes 246c are arranged along the length of the blade end of the first blade 24. Each first elongated hole 246c extends along the length and penetrates the first blade 24 along the thickness direction of the first blade 24. Preferably, the first elongated hole 246c is formed in a spoon-like shape, similar to the first elongated hole 246a described above, consisting of a reamer portion and an elongated hole portion. The second blade 23 is provided with rivet holes at positions corresponding to the first elongated holes 246c for riveting the blade end connecting assembly.

[0053] In this embodiment, the blade end connection assembly includes two connecting components 25c. Each connecting component 25c includes a connecting rod 253c, a rivet portion 252c integrally formed at one end of the connecting rod 253c, and a first cap-shaped head portion 251c integrally connected to the other end of the connecting rod 253c. The rivet portion 252c is riveted to the second blade 23 through the rivet hole of the second blade 23. The connecting rod 253c passes through the corresponding first slot 246c, and the inner end surface of the first cap-shaped head portion 251c facing the second blade 23 is buckled onto the outer surface of the first blade 24 away from the second blade 23. In this way, one end of each connecting component 25c is fixed to the second blade 23, while the other end can slide relative to the first blade 24. At the same time, the first cap-shaped head portion 251c can prevent the first blade 24 and the second blade 23 from separating excessively. Preferably, after the riveted portion 252c of the connecting member 25c is riveted to the second blade 23, the outer end surface of the riveted portion 252c does not extend beyond the outer side surface of the second blade 23 away from the first blade 24. The advantages of this structure are stable installation and high blade strength.

[0054] Fourth embodiment

[0055] Reference below Figure 6A and Figure 6B A fourth embodiment of the present invention will be described. The blade assembly in the fourth embodiment is similar to that in the first embodiment, and the same parts as those in the first embodiment will not be described again below.

[0056] like Figure 6A and Figure 6BAs shown, in this embodiment, two first elongated holes 246d are arranged along the length of the blade end of the first blade 24. Each first elongated hole 246d is a stepped hole and consists of a narrow hole portion 2461d having a smaller dimension in the width direction of the blade assembly 2 and a wide hole portion 2462d located on the outer side of the narrow hole portion 2461d, away from the second blade 23 and having a larger dimension in the width direction of the blade assembly 2. Preferably, the narrow hole portion 2461d is formed into a spoon-like shape composed of a flared hole portion and an elongated hole portion as described above, and the wide hole portion 2462d is formed into a waist-like shape. The second blade 23 is provided with a rivet hole for riveting the blade end connecting assembly at a position corresponding to the first elongated hole 246d.

[0057] In the present embodiment, the blade end connecting assembly includes two connecting parts 25d, each connecting part 25d includes a connecting rod 253d, a rivet 252d integrally formed at one end of the connecting rod 253d, and a first cap-shaped head 251d integrally connected to the other end of the connecting rod 253d. The rivet 252d is riveted to the second blade 23 through the rivet hole of the second blade 23, and the connecting rod 253d passes through the narrow hole portion 2461d of the corresponding first slot 246d. The first cap-shaped head 251d is placed in the wide hole portion 2462d of the corresponding first slot 246d and the inner end face of the first cap-shaped head 251d facing the second blade 23 is buckled on the bottom surface of the wide hole portion 2462d of the corresponding first slot 246d, and the outer end face of the first cap-shaped head 251d away from the second blade 23 does not exceed the outer side of the first blade 24 away from the second blade 23. Preferably, after the riveted portion 252d of the connecting member 25d is riveted to the second blade 23, the outer end surface of the riveted portion 252d does not extend beyond the outer side surface of the second blade 23 away from the first blade 24. This structure has the advantages of stable installation, avoiding interference between the connecting member and the workpiece during trimming and sawing, and wide adaptability.

[0058] Variations

[0059] Although various embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments. Those skilled in the art may make various modifications and variations to these embodiments within the scope of the present invention.

[0060] Although in the above embodiment, the number of connecting parts, bolts, nuts, and washers is two, and the number of long holes on the blade that cooperate with the connecting parts and the long holes that cooperate with the bolts, nuts, and washers is two, the number of the above parts can also be selected according to actual needs.

[0061] Although the cutter head end connecting assembly is a connecting part (connecting pin) in the above-described embodiment, the cutter head end connecting assembly can also be other parts possessing clamping and sliding function. In addition, in a cutter head end connecting assembly, the connecting part in different embodiments can be comprised.

[0062] Although in the above-described embodiments, the first and second elongated holes, or the narrowed hole portions thereon, are formed into a spoon-like (or key-like) shape composed of a large-diameter expanded hole portion and an elongated hole portion, those skilled in the art will appreciate that the large-diameter expanded hole portion is provided to allow the cap-shaped head portion of the connecting component to pass through the elongated hole. In cases where a modular connecting component is employed (e.g., the cap-shaped head portion of the connecting component is threadedly connected to the connecting rod), or where the connecting component has a large-diameter cap-shaped head portion at only one end so that the connecting component can be positioned without passing the cap-shaped head portion through the elongated hole, the elongated hole and the narrowed hole portions may alternatively be simple elongated holes (e.g., waist-shaped holes, rectangular holes, or elliptical holes).

[0063] Although in the above embodiment, the cap-shaped head has a substantially trapezoidal cross-sectional shape, the cap-shaped head may also have a semicircular, arched, rectangular or other cross-sectional shape. In addition, the shape of the cap-shaped head in the top view is not limited to a circle, but may also be an ellipse, a rectangle, a waist, etc.

[0064] Although one end of the connecting member is fixed by riveting into the rivet hole of the blade in the third and fourth embodiments, the one end of the connecting member may be fixed to the blade by other means such as welding.

[0065] Although the first blade and the second blade are integrally formed with their respective transmission engaging portions in the above embodiment, the first blade and the second blade may be separated from their respective transmission engaging portions and assembled together by fasteners.

[0066] Although the two cams of the dual cam driving block are offset by 180° in the above embodiment, the two cams may be offset by other angles.

[0067] Although the connection assembly in the above embodiment includes a head-end connection assembly (connecting component) and a body-end connection assembly, the connection assembly may include only one of the head-end and body-end connection assemblies while ensuring stable operation of the blade assembly. If only the body-end connection assembly is included, the length of the spacer and fixing plate may be appropriately increased. If only the head-end connection assembly is included, a device for retaining the individual blades may be added to the body.

[0068] Although in the above embodiments, the drive mechanism includes a dual-cam drive block, and the first and second blades are provided with transmission mating portions at the ends of the housing that engage with the two cams on the dual-cam drive block, and the first and second blades are caused to reciprocate by rotation of the dual-cam drive block, the blades may alternatively be driven to reciprocate by other mechanisms, such as a crank slider mechanism, a crank-connecting rod mechanism, or a reciprocating platform extending outside the housing and cooperating with the dual-cam drive block. In the case of a reciprocating platform, the first and second blades may be directly secured by the reciprocating platform.

[0069] Although in the above embodiment, the first working function is the sawing function achieved by the first blade and the second blade, both having saw teeth, cooperating with each other, and the second working function is the trimming function achieved by the third blade and the fourth blade, both having scissors teeth, cooperating with each other, however, the first working function may also be the first trimming function achieved by the first blade and the second blade, both having scissors teeth, cooperating with each other, and the second function may be the second trimming function achieved by the third blade and the fourth blade, both having scissors teeth constructed differently from the scissors teeth of the first blade and the second blade, cooperating with each other.

[0070] Although in the above embodiment, the convex surface on the blade is circular and arranged along the length direction, the convex surface can be of any appropriate shape and arranged in any appropriate form. In addition, the convex surface can also be not provided. Alternatively, in order to reduce the contact area between the first blade and the second blade, additional through holes or grooves can be provided on the opposing surfaces of the two blades, or a spacer that separates the first blade from the second blade can be provided on the connecting rod or the washer of the connecting component.

[0071] Although in the above embodiments, the blade assembly and the body are connected together by a fixing plate, the blade assembly and the body may be connected together by any other known means.

[0072] Although in the above embodiments a battery is provided in the body of the tool, the tool may also be powered by mains electricity, or support both battery power and mains power.

[0073] Although in the above embodiments the tool is a portable tool and the body of the tool includes a handle portion and a housing portion, the tool may also have other body structures and may be a multifunctional processing tool mounted on a workbench or a robot arm.

[0074] The foregoing description provides some exemplary embodiments and variations of the present invention for purposes of illustration and description. However, the foregoing description is not intended to be exhaustive or to limit the invention to the specific forms disclosed. It will be apparent to those skilled in the art that various modifications and variations are possible. For example, individual features may be arbitrarily combined, substituted, or omitted without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is limited solely by the appended claims and their equivalents.

Claims

1. A blade assembly comprising: a first blade and a second blade, wherein the first blade and the second blade both extend in a length direction of the blade assembly, and are respectively provided with a first cutting edge portion and a third cutting edge portion on opposite sides in a width direction of the first blade; and a second cutting edge portion and a fourth cutting edge portion on opposite sides in the width direction of the second blade; as well as a connecting assembly that stacks and connects the first blade and the second blade in a manner that allows the first blade and the second blade to reciprocate relative to each other along the length direction; Characterized in that the first edge portion of the first blade and the second edge portion of the second blade are configured to cooperate with each other to have a first working function, and the third edge portion of the first blade and the fourth edge portion of the second blade are configured to cooperate with each other to have a second working function different from the first working function; m first long holes are arranged on the first blade along the length direction, where m is an integer greater than or equal to 1, and each first long hole extends along the length direction and penetrates the first blade along the thickness direction of the first blade; m second long holes are arranged on the second blade along the length direction respectively corresponding to the m first long holes, each second long hole extends along the length direction and penetrates the second blade along the thickness direction of the second blade; The connecting assembly includes m connecting parts, each connecting part is mounted on the corresponding first long hole and second long hole in a manner that allows the first blade and the second blade to reciprocate relative to each other along the length direction; The first long hole is a stepped hole and consists of a narrow hole portion having a smaller size in the width direction of the blade assembly and a wide hole portion located outside the narrow hole portion away from the second blade and having a larger size in the width direction of the blade assembly; The second long hole is a stepped hole and is composed of a narrow hole portion having a smaller size in the width direction of the blade assembly and a wide hole portion located outside the narrow hole portion away from the first blade and having a larger size in the width direction of the blade assembly; and Each connecting component includes a connecting rod and a first cap-shaped head and a second cap-shaped head connected to both ends of the connecting rod, the connecting rod passes through the narrow hole portion of the corresponding first long hole and the narrow hole portion of the corresponding second long hole, the first cap-shaped head is placed in the wide hole portion of the corresponding first long hole and the inner end face of the first cap-shaped head facing the second blade is buckled on the bottom surface of the wide hole portion of the corresponding first long hole, and the outer end face of the first cap-shaped head away from the second blade does not exceed the outer side face of the first blade away from the second blade; the second cap-shaped head is placed in the wide hole portion of the corresponding second long hole and the inner end face of the second cap-shaped head facing the first blade is buckled on the bottom surface of the wide hole portion, and the outer end face of the second cap-shaped head away from the first blade does not exceed the outer side face of the second blade away from the first blade.

2. The blade assembly according to claim 1, wherein: The first blade portion includes saw teeth arranged at first intervals along the length direction, and the second blade portion includes saw teeth arranged at second intervals along the length direction, the first blade portion and the second blade portion cooperate with each other to achieve a sawing function as the first working function; and The third blade portion includes scissor teeth arranged at third intervals along the length direction, and the fourth blade portion includes scissor teeth arranged at fourth intervals along the length direction. The third blade portion and the fourth blade portion cooperate with each other to achieve a trimming function as the second working function.

3. The blade assembly according to claim 1, wherein: n third long holes are further arranged on the first blade along the length direction, where n is an integer greater than or equal to 1, and each third long hole extends along the length direction and penetrates the first blade along the thickness direction of the first blade; n fourth long holes are further arranged on the second blade along the length direction respectively corresponding to the n third long holes, each fourth long hole extends along the length direction and penetrates the second blade along the thickness direction of the second blade; A transmission fitting portion is provided at one end of the first blade and the second blade in the length direction; and The connecting assembly also includes a fuselage end connecting assembly, which is closer to the transmission mating part relative to the connecting component. The fuselage end connecting assembly includes a fixing plate, a gasket, n bolts, n nuts and n washers, wherein each washer is installed in the corresponding third long hole and fourth long hole, the thickness of each washer is greater than the total thickness of the first blade and the second blade stacked together, the fixing plate and the gasket are arranged to clamp the first blade and the second blade stacked together and the n washers in the middle, and each bolt passes through the fixing plate, the gasket and the corresponding washer to engage with the corresponding nut.

4. The blade assembly according to claim 2, wherein: The tooth edge of each saw tooth of the first blade portion and the tooth edge of each saw tooth of the second blade portion are inclined in opposite directions relative to the longitudinal direction.

5. The blade assembly according to claim 2, wherein: The tooth edge of each saw tooth of the first blade portion and the tooth edge of each saw tooth of the second blade portion are inclined in the same direction relative to the longitudinal direction.

6. The blade assembly according to claim 2, wherein: The first interval is smaller than the third interval and smaller than the fourth interval, and the second interval is smaller than the third interval and smaller than the fourth interval.

7. The blade assembly according to claim 1 or 2, characterized in that: A convex surface is arranged on at least one of the mutually opposing side surfaces of the first blade and the second blade.

8. A blade assembly comprising: a first blade and a second blade, wherein the first blade and the second blade both extend in a length direction of the blade assembly, and are respectively provided with a first cutting edge portion and a third cutting edge portion on opposite sides in a width direction of the first blade; and a second cutting edge portion and a fourth cutting edge portion on opposite sides in the width direction of the second blade; as well as a connecting assembly that stacks and connects the first blade and the second blade in a manner that allows the first blade and the second blade to reciprocate relative to each other along the length direction; Characterized in that the first edge portion of the first blade and the second edge portion of the second blade are configured to cooperate with each other to have a first working function, and the third edge portion of the first blade and the fourth edge portion of the second blade are configured to cooperate with each other to have a second working function different from the first working function; m first long holes are arranged on the first blade along the length direction, where m is an integer greater than or equal to 1, and each first long hole extends along the length direction and penetrates the first blade along the thickness direction of the first blade; and The connecting assembly includes m connecting components, each connecting component is mounted on a corresponding first slot in a manner capable of sliding relative to the first blade, and one end of each connecting component is riveted to the second blade; The first long hole is a stepped hole and is composed of a narrow hole portion having a smaller size in the width direction of the blade assembly and a wide hole portion located outside the narrow hole portion away from the second blade and having a larger size in the width direction of the blade assembly; and Each connecting component includes a connecting rod, a rivet portion connected to one end of the connecting rod and riveted to the second blade, and a first cap-shaped head connected to the other end of the connecting rod, wherein the connecting rod passes through the narrow hole portion of the corresponding first long hole, the first cap-shaped head is placed in the wide hole portion of the corresponding first long hole and the inner end surface of the first cap-shaped head facing the second blade is buckled on the bottom surface of the wide hole portion of the corresponding first long hole, and the outer end surface of the first cap-shaped head away from the second blade does not exceed the outer side surface of the first blade away from the second blade.

9. The blade assembly according to claim 8, wherein: The first blade portion includes saw teeth arranged at first intervals along the length direction, and the second blade portion includes saw teeth arranged at second intervals along the length direction, the first blade portion and the second blade portion cooperate with each other to achieve a sawing function as the first working function; and The third blade portion includes scissor teeth arranged at third intervals along the length direction, and the fourth blade portion includes scissor teeth arranged at fourth intervals along the length direction. The third blade portion and the fourth blade portion cooperate with each other to achieve a trimming function as the second working function.

10. The blade assembly according to claim 8, wherein n third long holes are further arranged on the first blade along the length direction, where n is an integer greater than or equal to 1, and each third long hole extends along the length direction and penetrates the first blade along the thickness direction of the first blade; n fourth long holes are further arranged on the second blade along the length direction respectively corresponding to the n third long holes, each fourth long hole extends along the length direction and penetrates the second blade along the thickness direction of the second blade; A transmission fitting portion is provided at one end of the first blade and the second blade in the length direction; and The connecting assembly also includes a fuselage end connecting assembly, which is closer to the transmission mating part relative to the connecting component. The fuselage end connecting assembly includes a fixing plate, a gasket, n bolts, n nuts and n washers, wherein each washer is installed in the corresponding third long hole and fourth long hole, the thickness of each washer is greater than the total thickness of the first blade and the second blade stacked together, the fixing plate and the gasket are arranged to clamp the first blade and the second blade stacked together and the n washers in the middle, and each bolt passes through the fixing plate, the gasket and the corresponding washer to engage with the corresponding nut.

11. The blade assembly according to claim 9, wherein: The tooth edge of each saw tooth of the first blade portion and the tooth edge of each saw tooth of the second blade portion are inclined in opposite directions relative to the longitudinal direction.

12. The blade assembly according to claim 9, wherein: The tooth edge of each saw tooth of the first blade portion and the tooth edge of each saw tooth of the second blade portion are inclined in the same direction relative to the longitudinal direction.

13. The blade assembly according to claim 9, wherein: The first interval is smaller than the third interval and smaller than the fourth interval, and the second interval is smaller than the third interval and smaller than the fourth interval.

14. The blade assembly according to any one of claims 8, wherein: A convex surface is arranged on at least one of the mutually opposing side surfaces of the first blade and the second blade.

15. A tool comprising a blade assembly according to any one of claims 1 to 14, characterized in that The tool includes a drive mechanism for driving the first blade and the second blade to reciprocate relative to each other along the length direction.

16. The tool according to claim 15, characterized in that The driving mechanism includes a double-cam driving block, the center of which is connected to the power output element of the tool, and the double-cam driving block has two staggered cams that respectively cooperate with the transmission cooperation part of the first blade and the transmission cooperation part of the second blade.

17. The tool according to claim 16, characterized in that The two cams of the dual-cam driving block are offset by 180°.

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