CN213755806U - Pruning shears capable of increasing sawing function - Google Patents

Abstract

The utility model provides a can increase the pruning scissors who saw cuts the function, this pruning scissors includes: a body assembly; the blade assembly comprises a first movable blade and a second movable blade which can reciprocate relative to each other, wherein the length of the first movable blade is longer than that of the second movable blade, and a first connecting structure is arranged on the part of the front part of the first movable blade, which is longer than the second movable blade; the rear part of the saw blade is provided with a second connecting structure; a connecting device capable of detachably connecting the saw blade to the first movable blade through the first connecting structure and the second connecting structure. Use the utility model discloses a pruning scissors can saw cut thicker trunk, rather than shearing by force, and saw cut the increase of function, cancel convenient operation is swift.

Description

Pruning shears capable of increasing sawing function

Technical Field

The utility model relates to a pruning scissors, especially a can increase the pruning scissors who saw cuts the function when needs.

Background

In the garden trimming operation, the pruning shears are widely applied due to the lightness and high efficiency. The pruning shears work by impact type shearing force, are suitable for pruning fine and soft vines and branches, but have no way for thick and hard trunks and the like. One possibility is that the cutting opening itself is smaller than the diameter of the trunk, resulting in the trunk not being able to enter the cutting opening, or even if the trunk is barely entering the cutting opening, it is not possible to cut it off at one time due to insufficient power of the machine. In the past, normal garden trimming work cannot be finished, and the machine is easily overloaded for a long time and damaged.

Chinese utility model CN205584860U provides a multifunctional tool and core structure thereof, and this multifunctional tool is with the help of a reciprocating motion platform for the accessible is changed different work assembly and is realized shearing, different functions such as sawing. However, the multifunction tool has room for improvement in convenience of function switching and the like.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a pruning shear that can increase the saw bit on pruning shear to can saw cut the trunk thicker, rather than cut by force, and increase, cancel the convenient operation that saw cut the function swift.

The utility model provides a pruning scissors, include: the blade assembly comprises a body assembly, a blade assembly, a saw blade and a connecting device. The blade assembly comprises a first movable blade and a second movable blade which can reciprocate relative to each other, wherein the length of the first movable blade is longer than that of the second movable blade, and a first connecting structure is arranged on the part of the front part of the first movable blade, which is longer than the second movable blade; the rear part of the saw blade is provided with a second connecting structure; the connecting device can detachably connect the saw blade to the first movable blade through the first connecting structure and the second connecting structure.

Optionally, the second connecting structure comprises a plurality of positioning holes arranged at the rear part of the saw blade along the longitudinal direction of the saw blade.

Optionally, the first connecting structure includes a plurality of connecting holes provided at the front portion of the first movable blade in the longitudinal direction of the first movable blade.

Optionally, the plurality of positioning holes and the plurality of connecting holes are correspondingly arranged, and the connecting device is a screw or a combination of a bolt and a nut.

Optionally, the connection device is a quick-clip device comprising: a quick clamping body which is formed with a cavity for accommodating a rear portion of the saw blade, the cavity being opened at a front side of the quick clamping body to receive the saw blade, and a plurality of first through holes each extending downward and communicating with the cavity being opened on an upper surface of the quick clamping body; a plurality of positioning pins, the number of which is equal to the number of the first through holes, and the plurality of positioning pins are respectively arranged in the corresponding first through holes; and an eccentric mechanism provided above the quick clamping body, the eccentric mechanism acting on an upper portion of each positioning pin by rotating the eccentric mechanism to a locking position, thereby moving each positioning pin downward to a position where the second coupling structure is fixed, and being movable upward to a position where the saw blade is released by rotating the eccentric mechanism to an unlocking position.

Optionally, the eccentric mechanism is formed as a straddle structure including cam portions at both ends and a cam shank portion connecting the cam portions at both ends together.

Optionally, the quick clamping device further includes a pin shaft and a torsion spring, wherein the upper portion of each positioning pin is installed in the span space of the straddle structure, the pin shaft passes through a transverse hole formed in the upper portion of each positioning pin and transverse holes formed in the cam portions at the two ends, so that each positioning pin is pivotally connected to the eccentric mechanism, the main body of the torsion spring is sleeved on the outer peripheral portion of the pin shaft and located in the span space of the straddle structure, one end of the torsion spring abuts against the quick clamping body, and the other end of the torsion spring abuts against the cam handle portion, so as to provide additional locking force for the eccentric mechanism.

Optionally, the second connecting structure is a plurality of positioning holes formed in the saw blade in the longitudinal direction of the saw blade, the positioning holes are positioning through holes or positioning blind holes, and when the eccentric mechanism is in the locking position, the positioning pins penetrate through the positioning through holes or abut against the bottom surfaces of the positioning blind holes.

Optionally, the first connecting structure is a plurality of connecting holes opened in the front portion of the first moving blade.

Optionally, a plurality of second through holes are further formed in the quick clamp body, and the quick clamp body and the first movable blade are connected with each other through bolts passing through the second through holes and the connecting holes and nuts matched with the bolts.

Optionally, the connecting means is non-detachably fixed, connected or formed on the first connecting structure or the second connecting structure.

Utilize the basis the utility model provides a pruning scissors can add or pull down the saw bit as required according to the work, provides very big convenience for the user. When the saw blade is not added, the characteristics of simple structure, light weight and high cutting efficiency of the common pruning shears can be exerted, when thick branches are encountered, the saw blade can be added for sawing instead of forced shearing, and short plates which can not be used as the force of the common pruning shears for the thick branches are supplemented. Furthermore, according to the utility model discloses a pruning scissors, its increase, the cancellation convenient operation that saw cut the function are swift.

Drawings

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is an exploded perspective view showing a quick clamping device according to one example of embodiment 1 of the present invention.

Fig. 2 is a perspective view showing a quick clamp body main body according to one example of embodiment 1 of the present invention, as viewed from obliquely below.

Fig. 3 is a perspective view showing a positioning pin according to one example of embodiment 1 of the present invention.

Fig. 4 is a perspective view showing an eccentric mechanism according to one example of embodiment 1 of the present invention.

Fig. 5 is a perspective view showing a cover plate according to one example of embodiment 1 of the present invention.

Fig. 6A is a sectional view showing the quick clamping device when the eccentric mechanism of the quick clamping device according to one example of embodiment 1 of the present invention is rotated to the lock position; and figure 6B is a side view of the quick-clamping device at this point.

Fig. 7A is a cross-sectional view showing the quick-clamping device when the eccentric mechanism of the quick-clamping device according to one example of embodiment 1 of the present invention is rotated to the unlocking position; and fig. 7B is a side view of the quick-clamping device at this time.

Fig. 8A is a perspective view showing pruning shears including a quick-clamping device according to embodiment 1 of the present invention; and fig. 8B is a partially exploded perspective view showing the pruning shears in the vicinity of the quick-clamping device.

Fig. 9A is a perspective view showing pruning shears according to embodiment 2 of the present invention; and fig. 9B is a partially exploded perspective view of the pruning shears.

Fig. 10 is a perspective view showing an eccentric mechanism according to a modification of embodiment 1 of the present invention.

Detailed Description

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same or similar elements or elements having the same effect are denoted by the same or similar reference numerals. Further, it is to be understood that the directions shown in the drawings and described throughout the present application are illustrative and not restrictive.

Example 1

Fig. 8A to 8B show pruning shears 10a capable of adding a sawing function according to embodiment 1 of the present invention.

The pruning shears 10a includes a body assembly 400a, a pair of movable blades (a first movable blade 100a1 and a second movable blade 100a2), a connecting device 200a and a saw blade 300 a.

Wherein a pair of movable blades 100a1, 100a2 constitute a blade assembly, which are driven by a power unit (not shown) in the body assembly 400a to reciprocate back and forth alternately with each other. The first movable blade 100a1 and the second movable blade 100a2 are both pruning blades with scissors teeth formed on both sides (but the scissors teeth may be formed only on one side or the scissors teeth on both sides are different), and fine and soft vines, branches and the like can be pruned by the shearing movement of the scissors teeth relative to each other during the reciprocating movement of the movable blades. The pruning shears 10a can be operated without mounting the saw blade 300a, or without mounting both the connecting device 200a and the saw blade 300a, and in this state, the structure constituted by the pair of movable blades 100a1, 100a2 and the body assembly 400a can be similar to that of an ordinary pruning shears. However, unlike the conventional pruning shears, in which the length of the first movable blade 100a1 is longer than the length of the second movable blade 100a2, a first coupling structure is provided at a portion of the front portion of the first movable blade 100a1, which is longer than the second movable blade 100a2, so as to be engaged with the coupling means. In the present embodiment, as shown in fig. 8B, the first coupling structure includes two coupling holes 110h opened at the front of the first movable blade 100a1 in the longitudinal direction of the first movable blade 100a 1.

Blade 300a may be a double-sided toothed blade as shown in fig. 8, or a blade with only one-sided teeth (as shown in fig. 1). When the saw blade with teeth on two sides is adopted, the teeth on two sides of the saw blade can have the same tooth shape and tooth pitch, and can also have different tooth shapes and tooth saws so as to adapt to different requirements. In addition, every basis the utility model discloses a can increase the pruning scissors of saw cutting function, can be equipped with the saw bit of multiple different length, width, thickness, profile of tooth, tooth pitch or material to richen the range of application of product. A second coupling structure is provided at the rear of the saw blade 300a to mate with the coupling device. The second connection structure and the first connection structure are preferably adapted to the connection device.

The coupling means is used to detachably couple the saw blade 300a to the first movable blade 100a1 through a first coupling structure and a second coupling structure. Thus, when the pruning shears 10a are required to perform a sawing operation, the saw blade 300a can be attached to the front end of the first movable blade 100a1 by means of the connecting device, so that the pruning shears have a sawing function at the same time (see fig. 8A). When the saw function is not to be performed, the saw blade 300a, or both the saw blade 300a and the connecting means, may be removed from the first movable blade 100a 1. Therefore, the characteristics of simple structure, portability and high cutting efficiency of the common pruning shears are fully exerted, and short plates which can not be used as forces of the common pruning shears for thicker branches are supplemented.

In this embodiment, the connecting device is a quick-clamping device 200 a. Such snap-on devices are described in detail below with reference to fig. 1 to 8.

Fig. 1 is an exploded perspective view showing a quick clamping device 200 according to one example of embodiment 1 of the present invention. Compared to the example shown in fig. 8A and 8B, the saw blade 300 according to the present example is formed with saw teeth only on one side, and the other structure is the same as the saw blade 300 a. Further, the quick clamping device 200 according to the present example is mainly configured to be fitted with the drive shaft 100 of the pruning shears. Since the drive shaft 100 is generally thicker than the moving blade, the rear 290 of the quick-clamping device 200 is generally thicker and thinner with respect to the upper wall than the rear of the quick-clamping device 200a shown in FIG. 8B. Those skilled in the art can easily thin the rear portion 290 of the quick clamping device 200 or change it to the form shown in fig. 8B, and can add a matching nut to the bolt 280 to better engage with the movable blade, and will not be described in detail herein.

In fig. 1, the saw blade 300 and the drive shaft 100 connected to the quick clamping device 200 are shown in phantom. As shown in the orthogonal coordinate system in fig. 1, the X direction in fig. 1 is defined as the front-rear direction (the positive direction of the X direction is front, and the negative direction is rear) or the longitudinal direction of the quick clamping device 200, the Z direction is defined as the up-down direction (the positive direction of the Z direction is up, and the negative direction is down) or the height direction of the quick clamping device 200, and the Y direction is defined as the left-right direction (the positive direction of the Y direction is left, and the negative direction is right) or the width direction of the quick clamping device 200.

As shown in fig. 1, the quick clamping device 200 includes a quick clamping body 210, two positioning pins 220 installed in the quick clamping body 210, and an eccentric mechanism 250 installed above the quick clamping body 210. Wherein the quick clamp body 210 includes a quick clamp body 210A and a cover plate 210B connected to each other by a rivet 270, the cover plate 210B being attached to a lower surface of the quick clamp body 210A from an underside of the quick clamp body 210A.

As shown in fig. 1 and 2, the quick clamping body main body 210A is formed in a substantially rectangular parallelepiped shape, and has a first groove 211a and a second groove 211b formed in the lower surface thereof, the first groove 211a and the second groove 211b being arranged in this order from the front to the rear. The depth and width of the first and second slots 211a and 211b may be different depending on the height and width of the saw blade 300 and the drive head 100.

The cover plate 210B covers at least a portion of the first slot 211a from below by mounting the cover plate 210B to the quick clamp body 210A, such that the cover plate 210B and the quick clamp body 210A together form a cavity 211 (see fig. 7A) for receiving the rear portion 310 of the saw blade 300, the cavity 211 is shaped to match the shape of the rear portion 310 of the saw blade 300, and the cavity 211 is open at least at the front side of the quick clamp body 210 to receive the saw blade 300.

Preferably, as shown in fig. 2 and 7A, the first slot 211a is formed with a chamfer at the edge of the front side of the quick clamp body 210A that is open to facilitate the insertion and extraction of the saw blade 300.

The second slot 211b is opened at the rear side of the quick jaw body 210A to receive the front portion of the driving shaft 100 (or the front portion of the first movable blade). The second groove 211b is shaped to match the shape of the front portion of the driving shaft 100 (or the front portion of the first movable blade).

As shown in fig. 1 and 5, the cover plate 210B is formed as a U-shaped plate member, and includes a bottom plate 215 for supporting the saw blade 300 and two side plates 216 corresponding to both sides of the quick jaw body 210A in the width direction. Two rivet holes 213 are formed in both sides of the quick clamping body main body 210A in the width direction, respectively, and two corresponding rivet holes 214 are formed in each side plate 216 of the cover plate 210B, respectively. The quick clamping body 210 is constructed by inserting two rivets 270 through the rivet holes 214 of the cover plate 210B and the rivet holes 213 of the quick clamping body 210A, respectively, to rivet the cover plate 210B and the quick clamping body 210A together.

The bottom plate 215 of the cover plate 210B is formed to have a length in the front-rear direction capable of covering at least a part of the first groove 211 a. The bottom plate 215 of the cover plate 210B may be formed to cover the entire first groove 211a, the entire first groove 211a and a part of the second groove 211B, or the entire first groove 211a and the entire second groove 211B, in the longitudinal direction, according to actual mounting requirements.

Referring to fig. 1 and 2, and fig. 6A and 7A, two first through holes 210h are opened on an upper surface 210s of the quick clamping body 210 in a region corresponding to the first groove 211a, the two first through holes 210h are arranged in the front-rear direction, and each first through hole 210h extends downward and communicates with the cavity 211 (the first groove 211 a). Specifically, referring to fig. 6A and 7A, each of the first through holes 210h is a stepped hole formed in the order of a small diameter portion 210ha and a large diameter portion 210hb from top to bottom, with a stepped portion 210hc formed between the small diameter portion 210ha and the large diameter portion 210 hb.

As mentioned above, the quick clamping device 200 further comprises two positioning pins 220. As shown in fig. 3, each alignment pin 220 includes a pin body 221. The pin body 221 is formed at an upper portion thereof with a lateral hole 222. Each of the positioning pins 220 is formed with a flange 223 at a position near a lower end (tip) 224. The lower end 224 of the locating pin 200 projects downwardly from the corresponding flange 223. The pin main body 221 has a diameter smaller than that of the small-diameter portion 210ha of the first through hole 210 h. The lower end 224 of the positioning pin 220 has a diameter smaller than that of a positioning hole 310h (to be described later) on the saw blade 300. The diameter of the flange 223 is larger than the diameter of the small diameter portion 210ha of the first through hole 210h and smaller than the diameter of the large diameter portion 210hb of the first through hole 210 h.

The manner in which the locating pin 220 is installed is described below. First, the compression spring 230 is fitted over the positioning pin 220, specifically, the compression spring 230 is fitted over the outer periphery of the pin main body 221, and one end rests on the upper surface of the flange 223. In a state where the cover plate 210B is detached from the quick clamp body 210A, two positioning pins 220 each of which has been fitted with the pressing spring 230 are inserted into the corresponding first through holes 210h from the lower side of the quick clamp body 210A, respectively, so that the lateral holes 222 of the upper portions of the positioning pins 220 are exposed from the upper surface 210s of the quick clamp body 210A, and the other ends of the pressing springs 230 abut on the stepped portion 210hc of the first through holes 210 h. That is, the pressing spring 230 is interposed between the stepped portion 210hc of the first through hole 210h and the flange 223 of the positioning pin 220.

As shown in fig. 1 and 4, the eccentric mechanism 250 is provided above the quick clamping body main body 210A (above the upper surface 210s), and the eccentric mechanism 250 is formed as a straddle structure including cam portions 252 at both ends and a cam shank portion 253 connecting the cam portions 252 at both ends together. The quick clamping device 200 further includes a pin shaft 260 and a torsion spring 240, an upper portion of each of the positioning pins 220 is installed in the span space (i.e., the space between the two cam portions 252), and the pin shaft 260 passes through the transverse hole 222 opened at the upper portion of each of the positioning pins 220 and the transverse holes 251 opened at the cam portions 252 at both ends, so that each of the positioning pins 220 is pivotally connected to the eccentric mechanism 250. The cam tang 253 may be imprinted with indicia 254 on its surface to indicate locking or unlocking.

As shown in fig. 1, the torsion spring 240 includes a main body (wound portion) and one end and the other end of an arm shape extending radially from the main body. The body of the torsion spring 240 fits over the pin 260 and is located in the span space of the straddle structure (preferably centered along the axial direction of the transverse bore 251). With the eccentric mechanism 250 installed, the one end of the torsion spring 240 abuts against the quick clamp body 210 and the other end abuts against the cam shank 253, thereby providing an additional locking force for the eccentric mechanism 250. Preferably, the one end of the torsion spring 240 is formed in a winding shape (e.g., a convex shape or a hook shape) and abuts on the upper surface of the quick clamp body 210, and the other end of the torsion spring 240 is also formed in a winding shape and is fitted in a groove 255 (see fig. 4) of the upper surface of the cam shank 253.

The locking and unlocking processes of the eccentric mechanism 250 are described below.

Referring to fig. 6A and 6B, as the cam stem 253 is rotated counterclockwise in the direction of arrow F1 toward the locking position shown in fig. 6B, the cam stem 253 carries the cam portion 252 to rotate counterclockwise, and as the radius of the portion of the cam in contact with the upper surface 210s of the quick clamp body 210A decreases, each of the positioning pins 220 moves downward such that the lower end 224 of the positioning pin 220 is inserted into the corresponding positioning hole 310h on the saw blade 300 and the lower surface of the flange 223 of each positioning pin 220 abuts against the upper surface of the saw blade 300. In this way, the saw blade 300 may be sandwiched between the lower surface of the flange 223 of the locating pin 220 and the upper surface of the cover plate 210B, thereby locking the saw blade 300 in the quick clamping device 200. At the same time, the compression spring 230 applies a downward pressing force to the upper surface of the flange 223, and the torsion spring 240 provides a torsion force in the same direction as F1, so that the positioning pin 220 is stably held in the locking position. In this example, the positioning hole 310h and the portion of the surface of the saw blade 300a that contacts the positioning pin 220 are used as the second coupling structure.

In addition, referring to fig. 7A and 7B, as the cam shank 253 is rotated clockwise in the direction of the arrow F2 toward the unlocking position shown in fig. 7B, the cam shank 253 rotates the cam portions 252 at both ends, and as the radius of the portion of the cam in contact with the upper surface 210s of the quick clamping body main body 210A increases, each positioning pin 220 is lifted upward by the eccentric mechanism 250 against the pressure of the compression spring 230 and the torque of the torsion spring 240, so that the lower end 224 of the positioning pin 220 positioned in each positioning hole 310h on the saw blade 300 is disengaged from the positioning hole 310h, at which time the saw blade 300 can be pulled out from the quick clamping body 210.

Referring to fig. 1, 2, and 6A and 7A, two second through holes 210H are opened in an area corresponding to the second groove 211b on the upper surface 210s of the quick clamping body 210, the two second through holes 210H are arranged in the front-rear direction, and each second through hole 210H extends downward and communicates with the second groove 211 b. The quick clamping body 210 and the driving shaft 100 are coupled to each other by a screw 280 passing through the second through hole 210H and screwed into a screw hole 110H provided on the driving shaft 100. Referring to fig. 2 and 8B, when the first movable blade 100a1 is engaged, the width of the second slot is adapted to the width of the front portion of the first movable blade 100a1, and a bolt 280 is inserted through the second through hole of the quick clamping device 200a and through the connecting hole (first connecting structure) 110h of the first movable blade 100a1, while the first movable blade 100a1 is fixedly connected to the quick clamping device 200 by means of a nut (not shown) or other screw.

As described above, the quick clamping device 200 provided by the present invention can conveniently and quickly realize the disassembly and assembly or replacement of the saw blade 300 by the cooperation of the eccentric mechanism 250 and the plurality of positioning pins 220; because the plurality of positioning pins 220 are used for multi-point positioning, the saw blade 300 can be accurately and firmly installed, the swing of the saw blade 300 during high-speed movement is avoided, and the service life of the pruning shears is prolonged; by designing the eccentric mechanism 250 to be a straddle structure, one eccentric mechanism 250 can operate a plurality of positioning pins 220 at the same time, improving the convenience of operation and ensuring the structural strength of the eccentric mechanism 250; the eccentric mechanism 250 is connected with the positioning pin 220 by adopting the pin shaft 260 penetrating through the cam part 252 and the positioning pin 220, so that the operation is more convenient and stable; by adopting the pressure spring 230 and the torsion spring 240, the position stability of the positioning pin 220 during operation is ensured, and the saw blade 300 is prevented from falling off from the quick clamping device 200 due to the accidental lifting of the positioning pin 220; by having the lower end 224 of the positioning pin 220 protrude into the corresponding positioning hole 310h of the saw blade 300, the saw blade 300 can be more firmly held than a positioning pin that clamps the saw blade 300 only by friction.

When the sawing operation needs to be performed, the pruning shears can have the sawing function at the same time only by mounting the saw blade 300/300a on the quick clamping device 200/200a through operating the eccentric mechanism 250 (eccentric handle) (see fig. 8A). When the saw cutting is not required to be performed, the eccentric handle is operated to remove the saw blade 300/300 a. Therefore, the characteristics of simple structure, portability and high cutting efficiency of the common pruning shears are fully exerted, and short plates which can not be used as forces of the common pruning shears for thicker branches are supplemented.

Example 2

Fig. 9A and 9B show pruning shears 10B capable of adding a sawing function according to embodiment 2 of the present invention. The pruning shears 10b according to this embodiment may have the same body assembly 400a, first movable blade 100a1, second movable blade 100a2, and saw blade 300a as the pruning shears 10a, except that the connecting device 200b is used instead of the connecting device 200 a/200.

As shown more clearly in fig. 9B, the connecting device 200B according to the present embodiment is constituted by two bolts 201B and two nuts 202B. When the sawing operation needs to be performed, the bolt 201b penetrates through the connecting hole (second connecting structure) 110h at the front part of the first movable blade 100a1 and the positioning hole (first connecting structure) 310h at the rear part of the saw blade 300a, and then the nut 202b is screwed on the bolt 201b, so that the fixed connection between the saw blade 300a and the first movable blade 100a1 is realized, and the pruning shears have the sawing function at the same time. When the sawing operation is not required to be performed, the bolt 201b is removed by unscrewing the nut 202b, so that the separation of the saw blade 300a from the first movable blade 100a1 is realized.

It is easily understood by those skilled in the art that the present embodiment requires two connecting holes 110h and two positioning holes 310h to be correspondingly disposed to facilitate the connection of the bolts. This is not required in example 1.

Modification examples

Although the preferred embodiments of the present invention have been described in detail hereinabove, the present invention is not limited thereto, and those skilled in the art can make various modifications and variations to the embodiments within the scope of the present invention.

For example, although in embodiment 1 shown in fig. 1, the cover plate 210B is formed as a U-shaped plate and is connected to the quick clamp body 210A by the two side plates 216, the present invention is not limited thereto, and the cover plate and the quick clamp body may be connected by other means. For example, as shown in fig. 8B, lugs having holes (e.g., screw holes) may be formed at both left and right sides of the quick clamp body, and in this case, the cover plate may be formed in a flat plate shape and have holes corresponding to the holes of the lugs, so that the cover plate may be fixed to the lugs of the quick clamp body by bolts or screws. Further, the cover plate 210B may be formed integrally with the quick clamp body 210A, i.e., the quick clamp body 210 is formed integrally as long as the quick clamp body 210 has a cavity 211 formed therein that is open at least at the front side of the quick clamp body 210 to receive the saw blade 300.

Although in the above embodiment 1, the double safety of the compression spring 230 and the torsion spring 240 is adopted, as long as the elastic force or the torque is sufficiently large, one of the compression spring 230 and the torsion spring 240 may be selected. An additional locking mechanism may also be utilized to lock the over-center mechanism in the locked position.

Although the eccentric mechanism 250 is formed in the straddle structure in embodiment 1 described above, the eccentric mechanism may be formed in any other suitable shape. For example, the eccentric mechanism may be formed as a comb-like structure or the like having more than two cam portions. Fig. 10 shows an eccentric mechanism 250a having a comb-like structure according to a modification, which eccentric mechanism includes that the eccentric mechanism 250a includes at least three cam portions (comb-tooth portions) 252a with lateral holes 251 a. In this case, an upper portion of each of the positioning pins 220 is installed in a space between the corresponding cam portions 252a, and a pin shaft 260 passes through a transverse hole 222 opened at the upper portion of each of the positioning pins and a transverse hole 251a on each of the cam portions 252a to pivotally connect each of the positioning pins with the eccentric mechanism.

Although in embodiment 1 described above, the positioning pin 220 and the eccentric mechanism 250 are pivotally connected by the pin shaft 260, the positioning pin and the eccentric mechanism may not be connected to each other. For example, an eccentric mechanism may be pivotally connected to a shaft having a fixed positional relationship with the quick clamping body, and when the eccentric mechanism is rotated to different positions, its cam surface presses the detent pin down to different depths, in which case the compression spring may be changed to a tension spring to assist the upward lifting of the detent pin at the unlocked position.

Although in the above embodiment 1, the quick clamping device 200 has two positioning pins 220, and two corresponding first through holes 210h and two corresponding compression springs 230, the present invention is not limited thereto, and the number of the positioning pins 220 may be an appropriate number greater than two, and in this case, the number of the first through holes, the compression springs, the torsion springs, and the cam portions (or the comb teeth portions) may be changed accordingly. Further, although in the above-described embodiment 1, the two positioning pins 220 are arranged in the front-rear direction (longitudinal direction), the present invention is not limited thereto, and a plurality of positioning pins may be arranged in the front-rear direction, in the left-right direction, or in a plurality of rows (a plurality of eccentric mechanisms may be provided).

Although in the above embodiment 1, the positioning hole 310h on the saw blade 300 is formed as a through hole, the positioning hole 310h may be formed as a blind hole.

Although in the above-described embodiment 1, the saw blade 300 is positioned by inserting the lower ends 224 of the positioning pins 220 into the corresponding positioning holes 310h on the saw blade 300 and abutting the lower surface of the flange 223 of each positioning pin 220 against the upper surface of the saw blade 300, the positioning pins may be engaged with the cover plate to position and fix the saw blade 300 only by friction, in which case, the positioning holes may not be provided on the saw blade 300 and the surface of the rear portion of the saw blade 300 may be used as the second coupling structure.

In addition, the positioning pin and/or the cover plate can be made of elastic material or attached with an elastic component (such as a gasket) to eliminate manufacturing errors and reduce vibration.

Although the second groove 211b is formed in the lower surface of the quick clamping body main body 210A and the front portion of the driving shaft 100 or the first movable blade 100A1 is received by the second groove 211b in the above embodiment 1, the manner of coupling the first movable blade 100A1 to the quick clamping device is not limited thereto. For example, after the first movable blade is inserted into the slot in the slot on the rear side of the quick clamp body main body, the screw is sequentially inserted through the through hole on the upper wall of the quick clamp body main body and the connecting hole on the first movable blade and then screwed into the screw hole on the lower wall of the quick clamp body main body; the first movable blade can be connected with the quick clamp body through buckling, screwing, locking and the like; in addition, the first movable blade and the quick clamp body can be directly bonded, welded or formed into an integral piece. In addition, the structure of the rear part of the quick clamping body can be designed to be similar to that of the front part, namely, the first movable blade is also fixed through the eccentric mechanism and the positioning pin. In this case, for example, two eccentric mechanisms and two sets of positioning pins may be provided in front and rear to fix the saw blade and the first movable blade, respectively; only one eccentric mechanism can be adopted to simultaneously actuate the positioning pin for fixing the saw blade and the positioning pin for fixing the first movable blade; alternatively, the saw blade and the first movable blade may be stacked as in embodiment 2, and each positioning pin may be passed through a positioning hole of the saw blade and a coupling hole of the first movable blade by an eccentric mechanism, so as to couple the saw blade and the first movable blade together.

Although in the above-described embodiments 1 and 2, the number of the positioning holes and the connecting holes is 2, and both are arranged in the front-rear direction, however, the present invention is not limited thereto, and the number of the positioning holes and/or the connecting holes may also be 3 or more, and may be arranged in the front-rear direction, in the left-right direction, or in a plurality of rows, and the positioning holes and/or the connecting holes may be round holes, screw holes, square holes, or have other shapes.

Although in the above embodiments 1 and 2, the connecting means is a means capable of being separated from both the saw blade and the first movable blade, the present invention is not limited thereto. The connecting device and the first connecting structure of the first movable blade or the second connecting structure of the saw blade can also be made into a non-detachable structure or made into an integral piece. For example, the bolt 280 of embodiment 2 may be riveted or welded directly to the first moving blade or saw blade; or, a locking clamp can be directly arranged on the first movable blade or the saw blade so as to realize the detachable locking connection of the first movable blade and the saw blade.

In addition, the above-described embodiment 1 and embodiment 2 may be combined with each other. For example, a quick-clamp device may be provided along with a bolt, nut, or other attachment device to allow the user to select as desired.

Features shown in the embodiments, particularly in different embodiments, may be combined or substituted without departing from the scope of the invention.

Claims (10)

1. Pruning shears (10a), characterized in that the pruning shears (10a) comprise:

a body assembly (400 a);

a blade assembly including a first movable blade (100a1) and a second movable blade (100a2) that can reciprocate with respect to each other, wherein the first movable blade (100a1) has a length longer than that of the second movable blade (100a2), and a first connecting structure is provided on a portion of a front portion of the first movable blade (100a1) that extends beyond the second movable blade (100a 2);

a saw blade (300a) provided with a second coupling structure at a rear portion (310); and

a coupling device capable of detachably coupling the saw blade (300a) to the first movable blade (100a1) through the first coupling structure and the second coupling structure.

2. The pruning shears (10a) according to claim 1, wherein the second connecting structure comprises a plurality of positioning holes (310h) bored in a rear portion (310) of the saw blade (300a) in a longitudinal direction of the saw blade (300 a).

3. The pruning shears (10a) according to claim 2, wherein the first connecting structure comprises a plurality of connecting holes (110h) opened at the front portion of the first movable blade (100a1) in the longitudinal direction of the first movable blade (100a 1).

4. The pruning shears (10a) according to claim 3, wherein the plurality of positioning holes (310h) are provided corresponding to the plurality of connecting holes (110h), and the connecting means is a screw or a combination of a bolt and a nut.

5. The pruning shear (10a) according to claim 1, wherein the connecting device is a quick-clamping device (200), the quick-clamping device (200) comprising:

a quick clamping body (210) which is formed with a cavity (211) for accommodating a rear portion (310) of the saw blade (300a), the cavity (211) being opened at a front side of the quick clamping body (210) to receive the saw blade (300a), and a plurality of first through holes (210h) opened on an upper surface (210s) of the quick clamping body (210), each first through hole (210h) extending downward and communicating with the cavity (211);

a plurality of positioning pins (220), the number of the plurality of positioning pins (220) being equal to the number of the plurality of first through holes (210h), and the plurality of positioning pins (220) being respectively arranged in the corresponding first through holes (210 h); and

an eccentric mechanism (250) disposed above the quick clamping body (210), the eccentric mechanism (250) acting on an upper portion of each positioning pin (220) by rotating the eccentric mechanism (250) to a locking position, thereby moving each positioning pin (220) downward to a position where the second coupling structure is fixed, and each positioning pin (220) being movable upward to a position where the saw blade (300a) is released by rotating the eccentric mechanism (250) to an unlocking position.

6. The pruning shear (10a) according to claim 5, wherein the eccentric mechanism (250) is formed as a straddle structure including two-end cam portions (252) and a cam shank portion (253) connecting the two-end cam portions (252) together.

7. The pruning shear (10a) according to claim 6, wherein the quick clamping device (200) further comprises a pin (260) and a torsion spring (240), wherein an upper portion of each positioning pin (220) is installed in a span space of the straddle structure, the pin shaft (260) passes through a transverse hole (222) formed at the upper portion of each positioning pin (220) and a transverse hole (251) formed at the cam portion (252) at both ends to pivotally connect each positioning pin (220) with the eccentric mechanism (250), the main body of the torsion spring (240) is sleeved on the periphery of the pin shaft (260) and is positioned in the span space of the straddle structure, one end of the torsion spring (240) is abutted against the quick clamp body (210) and the other end is abutted against the cam handle part (253), so that additional locking force is provided for the eccentric mechanism (250).

8. The pruning shear (10a) according to any one of claims 5 to 7, wherein the second connecting structure is a plurality of positioning holes (310h) bored in the saw blade (300a) in a longitudinal direction of the saw blade (300a), the positioning holes (310h) are positioning through holes or positioning blind holes, and the positioning pin (220) passes through the positioning through holes or abuts against a bottom surface of the positioning blind holes when the eccentric mechanism (250) is in the locking position.

9. The pruning shear (10a) according to any one of claims 5 to 7, wherein the first connecting structure is a plurality of connecting holes (110h) opened at the front of the first movable blade (100a 1);

the quick clamp body (210) is further provided with a plurality of second through holes (210H), and the quick clamp body (210) and the first movable blade (100a1) are connected with each other through bolts (280) penetrating through the second through holes (210H) and the connecting holes (110H) and nuts matched with the bolts (280).

10. The pruning shear (10a) according to any one of claims 1 to 7, wherein the connecting means is non-detachably fixed, connected or formed on the first connecting structure or the second connecting structure.

Images