Electric pruning shears

Abstract

A pair of electric pruning shears comprises: a bracket; the fixed blade, the movable blade and the driving plate are supported by the bracket; the pivot sequentially penetrates through the driving plate, the movable blade, the fixed blade and the bracket, and is provided with a shaft cap, a rotating shaft section, a fixed shaft section and a threaded section of which the diameters are gradually reduced; and the nut is screwed on the threaded section. The driving plate comprises a driving pin configured to act on the movable blade to drive the movable blade to rotate; a through hole and a socket communicated with the through hole and opened towards the periphery of the near side part of the movable blade are formed in the near side part of the movable blade, the diameter of the through hole is equal to that of the rotating shaft section, and the width of the socket is smaller than that of the rotating shaft section and larger than that of the fixed shaft section; the tightening position and the loosening position of the pivot are limited through screwing of the nut and the threaded section. At the tightening position, the rotating shaft section is rotationally matched with the through hole, and the socket faces the rotating shaft section; in the release position, the fixed shaft section is located in the through hole, and the socket faces the fixed shaft section.

Description

Technical Field

[0001] The present application relates to an electric pruning shear for pruning tree branches. Background Art

[0002] Electric pruning shears usually include a fixed blade and a movable blade driven by a motor. The blade edge of the movable blade is sharper than the blade edge of the fixed blade, and thus wears out faster. When the blade edge of the movable blade becomes blunt due to wear, the movable blade needs to be removed and replaced with a new movable blade.

[0003] In order to facilitate the disassembly of the movable blade, a type of electric pruning shear structure has been designed, in which the movable blade can be removed without disassembling other parts. For example, CN102884948A discloses an electric pruning shear, in which the movable blade can be pulled out for replacement only by turning the quick-lock wrench to the loose position. The movable blade is provided with a first groove and a second groove that are interconnected, and the size of the first groove is larger than the second groove. The shaft for locking the movable blade passes through the first groove, and the boss of the bevel gear is inserted into the second groove and cooperates with the second groove. The bevel gear drives the movable blade to swing back and forth through the boss. During the swinging process of the movable blade, the force exerted by the boss on the second groove is relatively large. Therefore, after long-term use, the matching clearance between the boss and the second groove increases due to wear, making it difficult for the electric pruning shears to maintain the expected operating performance. Summary of the invention

[0004] The present application aims to provide an electric pruning shear, whose movable blade is easy to assemble and disassemble and can maintain the expected operating performance of the electric pruning shear.

[0005] According to one aspect of the present application, there is provided an electric pruning shear, comprising:

[0006] Bracket;

[0007] A fixed blade, a movable blade and a driving plate supported by a bracket, wherein the fixed blade is fixed to the bracket, and the movable blade is configured to be driven by the driving plate and can rotate forward and reverse relative to the bracket;

[0008] A pivot shaft, which passes through the driving plate, the movable blade, the fixed blade and the bracket in sequence, and has a shaft cap, a rotating shaft section, a fixed shaft section and a threaded section with decreasing diameters; and

[0009] a nut, which is threadedly engaged with the threaded section;

[0010] Wherein, the driving plate comprises a driving pin, and the driving pin is configured to act on the movable blade to drive the movable blade to rotate;

[0011] A through hole and a socket connected to the through hole and open toward the periphery of the proximal portion of the movable blade are formed in the proximal portion of the movable blade, the diameter of the through hole is equal to the diameter of the rotating shaft section, and the width of the socket is smaller than the diameter of the rotating shaft section and larger than the diameter of the fixed shaft section; and

[0012] The tightening position and the loosening position of the pivot are defined by the screwing engagement of the nut and the threaded section; in the tightening position, the rotating shaft section is rotationally engaged with the through hole, and the socket faces the rotating shaft section; in the loosening position, the fixed shaft section is located in the through hole, and the socket faces the fixed shaft section.

[0013] In one embodiment, anti-rotation features that cooperate with each other are provided between the fixed shaft segment and the bracket, and the anti-rotation features are configured to maintain no relative rotation between the fixed shaft segment and the bracket in both the tightened position and the loosened position.

[0014] In one embodiment, a mounting groove is formed in the bracket, a proximal portion of the fixed blade is fixed in the mounting groove, and a shape-fitting portion is provided between the proximal portion of the fixed blade and the mounting groove to prevent the fixed blade from rotating relative to the bracket.

[0015] In one embodiment, a spring accommodating space is defined in the drive plate around the pivot, a compression spring is provided in the spring accommodating space, and the compression spring is axially compressed between the shaft cap and an annular step in the drive plate.

[0016] In one embodiment, the drive pin is a single drive pin, which is placed in a slot formed in the movable blade. The slot opens at the outer edge of the movable blade and extends obliquely toward the inside of the movable blade. The socket has the same direction as the slot.

[0017] In one embodiment, the driving pin includes a first driving pin and a second driving pin, the first driving pin abuts against an outer edge of the movable blade to drive the movable blade in a positive direction, and the second driving pin abuts against an inner edge of the movable blade to drive the movable blade in a reverse direction.

[0018] In one embodiment, the distance from the contact point between the first drive pin and the outer edge of the movable blade to the pivot is greater than the distance from the contact point between the second drive pin and the inner edge of the movable blade to the central axis of the pivot.

[0019] In one embodiment, within the rotation range of the drive plate, the second drive pin remains facing the stationary blade.

[0020] In one embodiment, the electric pruning shears further include a locking plate acted upon by a torsion spring, wherein the locking plate is configured to provide a one-way locking function to the nut under the action of the torsion spring to prevent the nut from rotating in a direction of loosening the pivot but allow the nut to rotate in a direction of tightening the pivot.

[0021] In another embodiment, the electric pruning shears further include a locking plate configured to provide a bidirectional locking function to the nut to prevent the nut from rotating in a direction of loosening the pivot and in a direction of tightening the pivot.

[0022] When the movable blade of the electric pruning shears according to the present application needs to be replaced, the user can screw the nut in the loosening direction, and the pivot moves in the loosening direction under the action of the compression spring, so that the fixed shaft section of the pivot is opposite to the socket of the movable blade, so that the movable blade can be pulled out from the pivot. Afterwards, the socket of the new movable blade is pushed into the fixed shaft section of the pivot, so that the fixed shaft section is located in the through hole of the movable blade. Then, the nut is screwed in the tightening direction, so that the pivot moves in the tightening direction and its rotating shaft section enters the through hole of the movable blade. In this way, the movable blade can be quickly disassembled and assembled without disassembling any other parts. On the other hand, the driving pin of the driving plate drives the movable blade from the edge of the movable blade, and the distance between the driving pin and the center of the pivot is large, which can reduce the force on the driving pin, suppress the wear rate of the driving pin, and maintain the expected operating performance of the electric pruning shears for a longer time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The foregoing and other aspects of the present application will be more fully understood through the following detailed description made with reference to the accompanying drawings, in which:

[0024] Figure 1 , Figure 2 They are respectively front and back views of an electric pruning shear according to an embodiment of the present application;

[0025] Figure 3 is a front view of the electric pruning shears after the shaft cap of the pivot shaft is cut off;

[0026] Figure 4 is a front view of the electric pruning shears after the drive plate is removed;

[0027] Figure 5 This is a front view of the electric pruning shears after the drive plate and movable blades are removed;

[0028] Figure 6 is a front view of the electric pruning shears after the drive plate, movable blade and fixed blade are removed;

[0029] Figure 7 is a schematic diagram of a movable blade of the electric pruning shears;

[0030] Figure 8 is a schematic diagram of the pivot of the electric pruning shears;

[0031] Fig. 9 , Fig.10 They are respectively a front view and a cross-sectional view of a drive plate of the electric pruning shears;

[0032] Fig.11 , Fig.12 They are partial schematic diagrams showing the locking relationship between the locking plate and the nut of the electric pruning shears;

[0033] Fig.13 , Fig.14 are cross-sectional views respectively showing the tightened state and the loosened state of the pivot of the electric pruning shears;

[0034] Figure 15-19 It is a schematic diagram of the modified structure of the electric pruning shears of the present application. DETAILED DESCRIPTION

[0035] The following describes a feasible implementation of the electric pruning shears for pruning branches of the present application with reference to the accompanying drawings. It should be noted that the accompanying drawings only show the features of the electric pruning shears improved by the present application, and the features not related to the improvements made by the present application are not shown. In order to clearly show the details of the improvements made by the present application, some structural details are simplified, and the drawings are not drawn according to the actual size.

[0036] First of all, it should be pointed out that in the description of this application, the side of the electric pruning shears close to the branch when in use is called the distal side, and the side close to the user is called the proximal side.

[0037] According to an embodiment of the present application, an electric pruning shear is Figure 1 , Figure 2 It is schematically shown in FIG. Figure 1 The front side of the electric pruning shears is shown in FIG. 1 , and the direction indicated by the front side can be referred to as the first side. Figure 2 , the back side of the electric pruning shears is shown, and the direction pointed by the back side can be referred to as the second side.

[0038] As shown in the figure, the electric pruning shears comprises a bracket 1, which is fixed in a housing (not shown) of the electric pruning shears and is used to support various functional components of the electric pruning shears.

[0039] The stationary blade 2 is fixedly mounted at its proximal portion on the distal end of the support 1 , for example, by form fit between the stationary blade 2 and the support 1 and by means of fasteners 2a , such as screws, rivets, and the like.

[0040] A movable blade 4 driven by a driving plate 3 is also mounted at the distal end of the support 1. The driving plate 3 and the movable blade 4 are both pivotable around a pivot 5. The pivot 5 is perpendicular to the first and second sides of the electric pruning shears.

[0041] See also Figure 8 The pivot 5 has a shaft cap 5a, a first shaft section 5b, a second shaft section 5c, a fixed shaft section 5d, and a threaded section 5e, which are sequentially arranged along the axial direction and have decreasing diameters. The first shaft section 5b, the second shaft section 5c, the fixed shaft section 5d, and the threaded section 5e are coaxial. The first shaft section 5b and the second shaft section 5c are both cylindrical sections.

[0042] The fixed shaft segment 5d may be a cylindrical segment. In this case, an anti-rotation feature 5f, such as a pair of flat surfaces facing radially opposite to each other, is formed on at least a portion of the outer circumference of the fixed shaft segment 5d.

[0043] Alternatively, the fixed shaft segment 5d may also be other non-cylindrical column segments, such as prism segments. In this case, the outer peripheral shape of the fixed shaft segment 5d itself generates the anti-rotation feature 5f.

[0044] See also Figure 1-Figure 5 , the shaft cap 5a of the pivot 5 abuts against the drive plate 3 on the first side of the electric pruning shears, and the first shaft section 5b passes through the drive plate 3. The second shaft section 5b passes through the movable blade 4, and the fixed shaft section 5c passes through the fixed blade 2 and the bracket 1. The threaded section 5e extends from the second side of the electric pruning shears. The nut 6 screwed on the threaded section 5e abuts against the bracket 1 on the second side of the electric pruning shears to tighten the pivot 5. The central axis of the pivot 5 defines the axial direction of the electric pruning shears.

[0045] On the second side of the electric pruning shear, a locking plate 8 acted upon by a torsion spring 7 is provided against the bracket 1. The locking plate 8 is rotatably mounted around a fixing screw 9 fixed to the bracket 1. Under normal conditions, the locking plate 8 is acted upon by the torsion spring 7 and is pushed against the outer periphery of the nut 6 to lock the nut 6 and prevent it from rotating in the direction of loosening the threaded section 5e.

[0046] See also Figure 5 , Figure 6The distal end of the bracket 1 is roughly plate-shaped and is formed with an axially recessed mounting groove 1a. The bottom of the mounting groove 1a faces the direction of the first side of the electric pruning shears. A tubular portion 1b extending from the bottom of the groove toward the first side of the electric pruning shears is formed in the approximate middle of the mounting groove 1a. The top surface of the tubular portion 1b is roughly flush with the top surface of the distal end of the bracket 1. The through hole 1c axially penetrates the material of the bracket 1 at the tubular portion 1b and the mounting groove 1a. The shape and size of the through hole 1c match the fixed shaft segment 5d of the pivot 5, and has an anti-rotation feature that matches the anti-rotation feature 5f of the fixed shaft segment 5d, so that the fixed shaft segment 5d can pass through the through hole 1c, and the fixed shaft segment 5d (that is, the entire pivot 5) is prevented from rotating relative to the bracket 1 by the anti-rotation features of each other, but the fixed shaft segment 5d (that is, the entire pivot 5) is allowed to move axially relative to the bracket 1.

[0047] The shape of the proximal end of the fixed blade 2 is configured to be suitable for being clamped in the mounting groove 1a. The fixed blade 2 is formed with an axial through hole, the inner diameter of which is the same as that of the tubular portion 1b of the bracket 1, so that the tubular portion 1b can pass through the axial through hole. And the proximal end of the fixed blade 2 is fixed to the bracket 1 by a fastener 2a. The fastener 2a can be a permanent fastener, such as a rivet or a weld, etc., to permanently fix the fixed blade 2 on the bracket 1; or, the fastener 2a can be a releasable fastener, such as a screw or a column fixed on the bracket 1, etc., so that the fixed blade 2 can be separated from the bracket 1.

[0048] A shape-fitting portion, such as an extended recess 1d, is formed at one or more locations of the mounting groove 1a for cooperating with a corresponding shape-fitting portion, such as a convex corner 2b, on the fixed blade 2 to help prevent the fixed blade 2 from rotating relative to the bracket 1 around the tubular portion 1b.

[0049] When the proximal end of the fixed blade 2 is fixed in the mounting groove 1a, the second side surface of the fixed blade 2 is close to the bottom of the mounting groove 1a, and the first side surface of the fixed blade 2 is flush with the first side surface of the distal end of the bracket 1 or slightly higher than the first side surface of the distal end of the bracket 1.

[0050] See also Fig. 9 , Fig.10 The driving plate 3 is generally in the shape of a plate, on which a first driving pin 3a and a second driving pin 3b extending toward the second side are fixed. A section of the outer periphery of the driving plate 3 is a gear section (sector gear) 3c, which is formed with gear teeth. The gear section 3c can be thickened relative to the main body of the driving plate 3 to increase the strength of the gear section 3c. The gear section 3c can be a spur gear section or a bevel gear section, which is used to mesh with a driving gear not shown. The driving gear is driven by a motor not shown, and drives the driving plate 3 to rotate in the forward and reverse directions through the gear section 3c.

[0051] A through hole 3d is formed in the driving plate 3. An annular step 3e is formed in the through hole 3d at a position close to the second side surface of the driving plate 3. At the annular step 3e, the inner diameter of the through hole 3d is equal to the outer diameter of the first rotating shaft section 5b of the pivot 5; at other positions, the inner diameter of the through hole 3d is greater than the outer diameter of the first rotating shaft section 5b of the pivot 5.

[0052] See also Figure 3 , the first rotating shaft section 5b of the pivot 5 passes through the through hole 3d. A portion of the first rotating shaft section 5b is inserted into the portion of the through hole 3d within the annular step 3e and forms a rotation fit, the remaining portion of the first rotating shaft section 5b is exposed by the annular step 3e, and an annular spring accommodating space 3f directly facing the first rotating shaft section 5b is formed in the through hole 3d. The compression spring 10 is placed in the spring accommodating space 3f around the first rotating shaft section 5b.

[0053] See also Figure 4 , Figure 7 The movable blade 4 has an outer edge and an inner edge. In the assembled state of the electric pruning shears, the inner edge faces the fixed blade 2, and the outer edge faces away from the fixed blade 2. The outer edge forms a blade back 4a. At the proximal part of the movable blade 4, the inner edge forms a blunt section 4b1, and the rest of the inner edge forms a sharp section (edge ​​section) 4b2.

[0054] The thickness of the proximal portion of the movable blade 4 and the thickness of the proximal portion of the stationary blade 2 may be set to be substantially equal, but this feature is not essential.

[0055] A through hole 4c is formed in the proximal part of the movable blade 4, and the inner diameter of the through hole 4c is equal to the outer diameter of the second rotating shaft section 5c of the pivot 5. The socket 4d extends from the proximal end of the movable blade 4 toward the distal side and is connected with the through hole 4c. When viewed perpendicularly to the main surface of the movable blade 4, the socket 4d is roughly rectangular, and the length direction points to the through hole 4c. The width of the socket 4d is smaller than the inner diameter of the through hole 4c, that is, smaller than the outer diameter of the second rotating shaft section 5c of the pivot 5, but larger than the outer diameter of the fixed shaft section 5d of the pivot 5. The second rotating shaft section 5c of the pivot 5 is suitable for passing through the through hole 4c and forming a rotational fit. Due to the width setting of the socket 4d, when the socket 4d faces the second rotating shaft section 5c of the pivot 5, the movable blade 4 cannot be pulled out of the pivot 5, and when the socket 4d completely faces the fixed shaft section 5d of the pivot 5, the movable blade 4 can be pulled out of the pivot 5.

[0056] It should be pointed out that, viewed perpendicularly to the main surface of the movable blade 4, the shape of the socket 4d may not be rectangular, as long as the width of the portion where it is connected to the through hole 4c (which can be called the passing width, i.e. the maximum diameter of a cylindrical object passing through the portion where the socket 4d is connected to the through hole 4c) is smaller than the outer diameter of the second rotating shaft section 5c of the pivot 5.

[0057] The first drive pin 3a and the second drive pin 3b on the drive plate 3 are arranged at positions such that, in the assembled state of the electric pruning shears, the first drive pin 3a contacts the blade back 4a from the outside, and the second drive pin 3b contacts the blunt section 4b1 from the inside. Viewed from the midplane between the two main surfaces of the movable blade 4, the contact point between the first drive pin 3a and the blade back 4a, and the contact point between the second drive pin 3b and the blunt section 4b1 are both located far from the center point of the pivot 5 (the second rotating shaft section 5c). These two contact points enable the drive plate 3 and the movable blade 4 to rotate integrally around the pivot 5, i.e., there is no relative rotation between the drive plate 3 and the movable blade 4.

[0058] The length of the second drive pin 3b extending from the drive plate 3 can be approximately equal to or slightly less than the thickness of the proximal portion of the movable blade 4. The position of the second drive pin 3b can be set so that, within the entire bidirectional rotation range of the drive plate 3, the second drive pin 3b always faces the first side surface of the fixed blade 2.

[0059] When the driving plate 3 is driven by the motor to rotate in the forward direction, the first driving pin 3a pushes the blade back 4a to drive the movable blade 4 to rotate in the forward direction around the pivot 5 (the second rotating shaft section 5c), that is, to rotate in the direction toward the fixed blade 2, so that the movable blade 4 is closed with the fixed blade 2. When the driving plate 3 is driven by the motor to rotate in the reverse direction, the second driving pin 3b pushes the blunt section 4b1 to drive the movable blade 4 to rotate in the reverse direction around the pivot 5 (the second rotating shaft section 5c), that is, to rotate in the direction away from the fixed blade 2, so that the movable blade 4 is separated from the fixed blade 2.

[0060] The distance between the contact point between the first drive pin 3a and the blade back 4a and the center point of the pivot 5 (positive drive arm) is greater than the distance between the contact point between the second drive pin 3b and the blunt section 4b1 and the center point of the pivot 5 (negative drive arm). This feature reduces the reaction force received by the first drive pin 3a when the movable blade 4 is driven to rotate in the positive direction, thereby effectively protecting the first drive pin 3a.

[0061] See also Fig.11 , Fig.12 The outer periphery of the nut 6 forms a circle of teeth (ratchet teeth) 6a. The locking plate 8 has a generally plate-like body, which is rotatably mounted around the fixing screw 9 close to the first side surface of the bracket 1. One or more teeth (ratchets) 8a are formed on the first edge portion of the plate-like body, and the teeth 8a are suitable for meshing with the teeth 6a. The first edge portion of the plate-like body forms a folded edge 8b.

[0062] The coil of the torsion spring 7 surrounds the fixing screw 9, and the two spring ends are respectively fixed to the bracket 1 and the locking plate 8. The torsion spring 7 applies a torque to the locking plate 8 tending to keep the teeth 8a meshing with the teeth 6a.

[0063] Under normal circumstances, Fig.11As shown in the figure, the locking plate 8 is pushed against the outer periphery of the nut 6 by the torsion spring 7, the teeth 8a mesh with the teeth 6a, and the folded edge 8b pushes against the outer peripheral edge of the bracket 1. In this state, the locking plate 8 locks the nut 6 in one direction, so that the nut 6 cannot rotate in the direction of loosening the threaded section 5e, that is, the pivot 5 cannot be loosened. In this state, if the nut 6 is rotated in the direction of tightening the threaded section 5e, as shown by the one-way arrow in the figure, the teeth 6a will push the teeth 8a away, and the nut 6 can rotate in the direction of tightening the threaded section 5e, that is, the pivot 5 can be locked.

[0064] If the locking plate 8 is pulled against the action of the torsion spring 7 to rotate around the fixing screw 9, the folded edge 8b leaves the outer peripheral edge of the bracket 1, and the tooth 8a leaves the tooth 6a, the one-way locking of the locking plate 8 on the nut 6 is released. Fig.12 As shown, at this time, the nut 6 can rotate in two directions, as shown by the unidirectional arrow in the figure, and can both lock the pivot 5 and loosen the pivot 5.

[0065] It can be understood that the locking plate 8 can have any suitable structure as long as it can realize the one-way locking function of the nut 6 described above under normal conditions, that is, under normal conditions, the nut 6 is prevented from rotating in the direction of loosening the pivot 5, but the nut 6 is allowed to rotate in the direction of tightening the pivot 5; and after the locking plate 8 is pulled, the one-way locking of the nut 6 can be released, that is, the nut 6 is allowed to rotate in both directions of loosening and tightening the pivot 5.

[0066] In addition, the torsion spring 7 may also adopt various suitable forms (such as the torsion coil spring shown in the figure, the leaf spring not shown, etc.), as long as it can bias the locking plate 8 toward the one-way locking nut 6.

[0067] See also Fig.13 The fixed blade 2, the driving plate 3 and the movable blade 4 are assembled on the bracket 1 through a pivot, the pivot 5 is in a position tightened by the nut 6, and the shaft cap 5a is pushed against the first side surface of the driving plate 3. The first rotating shaft section 5b is located at the through hole 3d of the driving plate 3 (see Fig. 9 , Fig.10 ), the compression spring 10 is axially compressed around the first shaft section 5b between the shaft cap 5a and the annular step 3e of the drive plate 3. The second shaft section 5c is located at the through hole 4c of the movable blade 4 (see Figure 7 ) and is radially faced by the socket 4d. The fixed shaft section 5d is located in the through hole 1c of the bracket 1 (see Figure 6 ), passes through the tubular portion 1b, and the anti-rotation feature between the second shaft section 5c and the through hole 1c prevents the pivot 5 from rotating relative to the bracket 1. The threaded section 5e is tightened by the nut 6.

[0068] In order to realize the above positional relationship, the height of the first rotating shaft section 5b of the pivot 5 can be set to be equal to or slightly less than the thickness of the main body of the driving plate 3, the height of the second rotating shaft section 5c can be set to be equal to or slightly less than the thickness of the proximal part of the movable blade 4, and the height of the fixed shaft section 5d can be set to be equal to or slightly less than the thickness of the distal end of the bracket 1. The thickness of the proximal part of the movable blade 4 is less than the thickness of the distal end of the bracket 1, and the height of the second rotating shaft section 5c is less than the height of the fixed shaft section 5d.

[0069] In this state, the socket 4d completely faces the second shaft section 5c. The width of the socket 4d is smaller than the outer diameter of the second shaft section 5c, so the socket 4d can prevent the movable blade 4 from being axially withdrawn from the pivot 5. Figure 7 ), the movable blade 4 can rotate bidirectionally around the pivot 5 under the action of the driving pin to realize the pruning function of the electric pruning shears.

[0070] During the operation of the electric pruning shears, due to the one-way locking function of the locking plate 8 on the nut 6, the nut 6 will not come loose, which helps to maintain the normal function of the electric pruning shears.

[0071] If you need to replace the movable blade 4, Fig.14 As shown, the locking plate 8 can be moved away so that the teeth 8 a leave the teeth 6 a , and then the nut 6 can be screwed in a direction to loosen the pivot 5 .

[0072] When the nut 6 is screwed in the direction of loosening the pivot 5, the compression spring 10 axially pushes the shaft cap 5a to leave the drive plate 3, that is, the entire pivot 5 moves toward the first side until the socket 4d of the movable blade 4 radially faces the fixed shaft section 5d of the pivot 5. Since the width of the socket 4d is greater than the outer diameter of the fixed shaft section 5d, the movable blade 4 can be pulled axially from the pivot 5 at this time, and the socket 4d passes over the fixed shaft section 5d, and finally the movable blade 4 is completely pulled out from between the fixed blade 2 and the drive plate 3. Since the height of the second rotating shaft section 5c is less than the height of the fixed shaft section 5d, during the process of loosening the pivot 5, including the state in which the socket 4d of the movable blade 4 radially faces the fixed shaft section 5d of the pivot 5, the anti-rotation feature between the fixed shaft section 5d and the bracket 1 can remain matched, so that the pivot 5 can always be prevented from rotating, which is conducive to the loosening of the pivot 5.

[0073] After that, a new movable blade 4 can be inserted between the fixed blade 2 and the drive plate 3. Next, by screwing the nut 6 in the direction of tightening the pivot 5, the pivot 5 is gradually brought back. Fig.13 When the electric pruning shears are tightened to the position shown, they resume normal operation.

[0074] In order to facilitate the insertion of the movable blade 4 into the correct position when installing it, a stop structure (not shown) for the proximal end of the movable blade 4 can be provided on the fixed blade 2, such as a circular arc-shaped protrusion protruding from the first side surface of the fixed blade 2. When the proximal end of the movable blade 4 pushes against the stop structure, it can be determined that the movable blade 4 has been inserted into place.

[0075] By constructing the electric pruning shears in the above-mentioned manner, the movable blade 4 can be conveniently disassembled without first disassembling any other parts.

[0076] Preferably, the axial position and size of the anti-rotation feature between the bracket 1 and the fixed shaft segment 5d are designed so that when the pivot 5 is loosened to the loosened position to disassemble the movable blade 4, the anti-rotation feature between the bracket 1 and the fixed shaft segment 5d remains engaged to prevent the pivot 5 from rotating relative to the bracket.

[0077] By arranging the compression spring 10 between the shaft cap 5a and the driving plate 3, when the nut 6 is screwed in the direction of loosening the pivot 5, the compression spring 10 pushes the pivot 5 to move axially and loosen it, which further facilitates the disassembly and assembly of the movable blade 4.

[0078] In addition, since the length of the second drive pin 3b extending from the drive plate 3 is roughly equal to or slightly less than the thickness of the proximal portion of the movable blade 4, and the second drive pin 3b always faces the first side surface of the fixed blade 2, after the movable blade 4 is pulled out, the second drive pin 3b will be pushed against the first side surface of the fixed blade 2, thereby helping to maintain an axial distance between the drive plate 3 and the fixed blade 2 that is roughly equal to or only slightly less than the thickness of the proximal portion of the movable blade 4, which is conducive to inserting a new movable blade 4 between the drive plate 3 and the fixed blade 2.

[0079] In addition, the first drive pin 3a and the second drive pin 3b are configured to drive the movable blade 4 from the outer and inner side edges of the movable blade 4, which can provide a larger driving force arm compared to when the drive pin acts on the movable blade 4 in the socket 4d, making the movable blade 4 and the drive pin less prone to wear, thereby maintaining the operating performance of the electric pruning shears.

[0080] Furthermore, by providing the locking plate 8 with a one-way locking function for the nut 6, it is possible to prevent the nut 6 from loosening during the operation of the electric pruning shears, thereby ensuring that the normal function of the electric pruning shears is maintained.

[0081] Based on the basic principles of the present application, those skilled in the art can make various modifications to the electric pruning shears described above. Several possible modifications are introduced below.

[0082] See also Fig.15According to a modification, the first shaft section 5b and the second shaft section 5c described above are constructed to have equal outer diameters, so that the two are combined into a single shaft section 5b'. In the locked position of the pivot 5, the drive plate 3 and the movable blade 4 can rotate around the common shaft section 5b'. Fig.15 The other aspects of the modification shown are similar to those previously described with reference to Figure 1-Figure 14 The description is the same and will not be repeated here.

[0083] See also Fig.16 According to another modification, the annular spring accommodating space 3f in the drive plate 3 for accommodating the compression spring 10 is arranged to be separated from the pivot 5 in the radial direction, rather than directly facing the pivot 5. This modification can improve the stability of the drive plate 3. The pivot 5 in this modification may include a single rotating shaft section 5b' (such as Fig.16 ), may also include the first rotating shaft segment 5b and the second rotating shaft segment 5c having different diameters as described above. Fig.16 The other aspects of the modification shown are similar to those previously described with reference to Figure 1-Figure 14 The description is the same and will not be repeated here.

[0084] Figure 17-Figure 19 Another modification is described in Fig.17 The driving plate 3 and the movable blade 4 are shown combined together. Fig.18 , Fig.19 The driving plate 3 and the movable blade 4 are shown separately. As shown in the figure, a single driving pin (first driving pin) 3a is provided on the distal end of the driving plate 3, and the second driving pin 3b described above is cancelled. A driving pin slot 4e is formed in the back 4a of the movable blade 4, and the slot 4e extends obliquely from the back 4a to the material of the movable blade 4. The opening of the slot 4e is located on the back 4a, and the slot 4e is generally obliquely directed to the proximal direction of the movable blade 4. The direction of the socket 4d of the movable blade is basically the same as that of the slot 4e (it can be considered that the angle is basically the same relative to the line between the tip of the movable blade 4 and the through hole 4c, and the respective openings are facing the proximal direction), so as to facilitate the disassembly and assembly of the movable blade 4. Due to the existence of the slot 4e that is open to the back 4a and is obliquely arranged, when the driving pin 3a is located in the slot 4e, the driving pin 3a can drive the movable blade 4 in the forward direction and the reverse direction through the materials on both sides of the slot 4e. In this modification, the second driving pin 3b is cancelled, and the structure of the electric pruning shear is simplified. The annular spring accommodation space 3f in the drive plate 3 of the present modification can be arranged to be radially spaced from the through hole 3d in the drive plate 3 (e.g. Fig.18 ), or Figure 1-Figure 14 Directly facing the pivot 5 as in the embodiment in FIG. Figure 17-Figure 19 The other aspects of the modification shown are similar to those previously described with reference to Figure 1-Figure 14 The described implementation methods are the same and will not be repeated here.

[0085] According to another modification not shown, the locking plate 8 can be modified to provide a two-way locking function for the nut 6, so as to prevent the nut 6 from rotating in the direction of loosening the pivot 5 and in the direction of tightening the pivot 5 at the same time. For example, the locking plate 8 is fixed to the bracket 1 by a fixing screw 9, and the teeth 8a of the locking plate 8 are engaged with the teeth 6a of the nut 6 to prevent the nut 6 from rotating in any direction. After the fixing screw 9 is loosened, the nut 6 can rotate in any direction. In this example, the torsion spring 7 is not required.

[0086] According to specific needs, those skilled in the art can construct other modifications. Various modifications can be combined with each other without conflicting in structure. These modifications can basically obtain the above referenced Figure 1-Figure 14 The described implementation has the same technical effect.

[0087] Although the present application is described herein with reference to specific embodiments, the scope of the present application is not limited to the details shown. Various modifications may be made to these details without departing from the basic principles of the present application.

Claims

1. An electric pruning shear, comprising: Bracket (1); A fixed blade (2), a movable blade (4) and a driving plate (3) supported by a bracket (1), wherein the fixed blade (2) is fixed on the bracket (1), and the movable blade (4) is configured to be driven by the driving plate (3) to rotate in a positive and negative direction relative to the bracket (1); A pivot shaft (5) which passes through the driving plate (3), the movable blade (4), the fixed blade (2) and the bracket (1) in sequence and has a shaft cap (5a) with decreasing diameters, a rotating shaft section, a fixed shaft section (5d) and a threaded section (5e); and a nut (6) threadedly engaged with the threaded section (5e); Wherein, the driving plate (3) comprises a driving pin, and the driving pin is configured to act on the movable blade (4) to drive the movable blade (4) to rotate; A through hole (4c) and a socket (4d) connected to the through hole (4c) and open toward the periphery of the proximal portion of the movable blade (4) are formed in the proximal portion of the movable blade (4), the diameter of the through hole (4c) being equal to the diameter of the rotating shaft section, the width of the socket (4d) being smaller than the diameter of the rotating shaft section and larger than the diameter of the fixed shaft section (5d); and The tightening position and the loosening position of the pivot (5) are defined by the screwing engagement of the nut (6) and the threaded section (5e); in the tightening position, the rotating shaft section is rotationally engaged with the through hole (4c), and the socket (4d) faces the rotating shaft section; in the loosening position, the fixed shaft section (5d) is located in the through hole (4c), and the socket (4d) faces the fixed shaft section (5d).

2. The electric pruning shears according to claim 1, wherein: Anti-rotation features that cooperate with each other are provided between the fixed shaft section (5d) and the bracket (1), and the anti-rotation features are configured to maintain no relative rotation between the fixed shaft section (5d) and the bracket (1) in both the tightened position and the loosened position.

3. The electric pruning shears according to claim 1 or 2, wherein: A mounting groove (1a) is formed in the bracket (1), a proximal portion of the fixed blade (2) is fixed in the mounting groove (1a), and a shape-matching portion is provided between the proximal portion of the fixed blade (2) and the mounting groove (1a) to prevent the fixed blade (2) from rotating relative to the bracket (1).

4. The electric pruning shears according to any one of claims 1 to 3, wherein: A spring accommodating space (3f) is defined in the drive plate (3) around the pivot (5), a compression spring (10) is arranged in the spring accommodating space (3f), and the compression spring (10) is axially compressed between the shaft cap (5a) and the annular step (3e) in the drive plate (3).

5. The electric pruning shears according to any one of claims 1 to 4, wherein: The driving pin is a single driving pin, which is arranged in a slot (4e) formed in the movable blade (4). The slot (4e) opens at the outer edge of the movable blade (4) and extends obliquely toward the inside of the movable blade (4). The socket (4d) has the same direction as the slot (4e).

6. The electric pruning shears according to any one of claims 1 to 4, wherein: The driving pin comprises a first driving pin (3a) and a second driving pin (3b), wherein the first driving pin (3a) abuts against the outer edge of the movable blade (4) to drive the movable blade (4) in a positive direction, and the second driving pin (3b) abuts against the inner edge of the movable blade (4) to drive the movable blade (4) in a reverse direction.

7. The electric pruning shears according to claim 6, wherein: The distance from the contact point between the first drive pin (3a) and the outer edge of the movable blade (4) to the pivot (5) is greater than the distance from the contact point between the second drive pin (3b) and the inner edge of the movable blade (4) to the central axis of the pivot (5).

8. The electric pruning shears according to claim 7, wherein: Within the rotation range of the drive plate (3), the second drive pin (3b) remains facing the fixed blade (2).

9. The electric pruning shears according to any one of claims 1 to 8, wherein: It also includes a locking plate (8) acted upon by a torsion spring (7), wherein the locking plate (8) is configured to provide a one-way locking function to the nut (6) under the action of the torsion spring (7), so as to prevent the nut (6) from rotating in a direction of loosening the pivot (5), but allow the nut (6) to rotate in a direction of tightening the pivot (5).

10. The electric pruning shears according to any one of claims 1 to 8, wherein: It also includes a locking plate (8) configured to provide a bidirectional locking function for the nut (6) to prevent the nut (6) from rotating in a direction of loosening the pivot (5) and in a direction of tightening the pivot (5).

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