Pruning shears

Abstract

The present invention relates to a pruning shear, which comprises a main body housing, a driving component installed in the main body housing, and a cutter head component connected to the front end of the main body housing. The cutter head component includes a head housing fixed to the front end of the main body housing, a fixed cutter blade fixed to the head housing, and a moving cutter blade connected to the driving component. The driving component drives the moving cutter blade to move, so that the moving cutter blade makes a reciprocating shearing action relative to the fixed cutter blade; the driving component includes a swing tooth connected to the moving cutter blade, and the cutter head component includes a connecting piece disposed between the swing tooth and the moving cutter blade. The connecting piece includes a first part received in the moving cutter blade. In the feed direction, the contact surface between the first part and the moving cutter blade is an inclined surface. By setting the contact surface between the connecting piece and the moving cutter blade as an inclined surface in the feed direction, the present invention can effectively limit the separation of the cutting edges of the moving cutter blade and the fixed cutter blade, and has a good shearing effect.

Description

Technical Field

[0002] The present invention relates to the field of gardening tools, and particularly to a pruning shear.

Background Art

[0004] A pruning shear is a gardening product in which a motor drives a cutter head assembly to operate via a speed reduction structure to shear branches and the like. The cutter head assembly of the pruning shear includes a head shell fixed at the front end, a fixed blade fixed to the head shell, and a moving blade connected to the speed reduction mechanism. The moving blade reciprocates under the drive of the speed reduction mechanism to perform a reciprocating cutting action relative to the fixed blade.

[0005] However, due to the existence of the reverse edge of the blade, during actual shearing, the edge portions of the moving blade and the fixed blade will be forced to separate. Usually, a locking nut is used for locking to provide an axial pressure to prevent the axial separation of the edge of the moving blade and the fixed blade. However, this pressure always exists during the feeding and retracting processes of the pruning shear, resulting in accelerated wear of the supporting parts of the moving blade and the fixed blade, reduced service life, increased current of the whole machine, and reduced efficiency. In addition, when the supporting parts of the moving blade and the fixed blade are worn, the locking force provided by the locking nut gradually decreases, and the moving blade and the fixed blade are more likely to separate, seriously affecting the shearing quality (such as an uneven shearing cross-section, connecting the bark, etc.).

[0006] In view of this, it is indeed necessary to provide an improved pruning shear to overcome the defects existing in the prior art.

Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a pruning shear with good shearing effect and long service life.

[0009] The present invention can adopt the following technical solutions to solve the problems of the prior art: A pruning shear includes a main body housing, a driving component installed in the main body housing, and a cutter head component connected to the front end of the main body housing. The cutter head component includes a head shell fixed to the front end of the main body housing, a fixed blade fixed to the head shell, and a moving blade connected to the driving component. The driving component drives the moving blade to move so that the moving blade makes a reciprocating shearing action relative to the fixed blade. The driving component includes a swing tooth connected to the moving blade. The cutter head component includes a connecting piece disposed between the swing tooth and the moving blade. The connecting piece includes a first part received in the moving blade. In the feeding direction, the contact surface between the first part and the moving blade is an inclined surface.

[0010] A further improved solution is that the connecting piece includes a second part received in the swing tooth, and the first part and the second part are of an integral structure.

[0011] A further improvement solution is: in the tool withdrawal direction, the contact surface between the first part and the moving blade is a straight surface.

[0012] A further improvement solution is: the second part includes a front end that contacts the oscillating tooth in the feed direction and a rear end that contacts the oscillating tooth in the tool withdrawal direction, and the front end and the rear end are parallel to each other.

[0013] A further improvement solution is: the inclined surface extends from the end of the front end towards the straight surface.

[0014] A further improvement solution is: the rear end and the straight surface are in the same plane.

[0015] A further improvement solution is: the drive assembly includes a motor installed in the main body housing, a reduction mechanism connected to the front end of the motor, and a transmission gear driven by the reduction mechanism. The transmission gear extends into the head housing and meshes with the oscillating tooth.

[0016] A further improvement solution is: in the vertical direction perpendicular to the feed direction, the oscillating tooth, the moving blade, and the fixed blade are arranged in sequence from top to bottom.

[0017] A further improvement solution is: the tool head assembly includes a locking member and a lock nut installed on the head housing. After the locking member passes through the oscillating tooth, the moving blade, the fixed blade, and the head housing in sequence, it is locked by the lock nut.

[0018] The present invention can also adopt the following technical solution to solve the problems of the prior art: a pruning shear includes a main body housing, a drive assembly installed in the main body housing, and a tool head assembly connected to the front end of the main body housing. The tool head assembly includes a head housing fixed to the front end of the main body housing, a fixed blade fixed to the head housing, and a moving blade connected to the drive assembly. The drive assembly drives the moving blade to move so that the moving blade makes a reciprocating shearing action relative to the fixed blade; the drive assembly includes an oscillating tooth connected to the moving blade, and the tool head assembly includes a connecting member disposed between the oscillating tooth and the moving blade. When feeding, the connecting member generates a driving force on the moving blade, and the driving force includes a first component force moving in the feed direction and a second component force pressing towards the moving blade, and the first component force and the second component force are intersectingly arranged.

[0019] Compared with the prior art, the present invention has the following beneficial effects: in the feed direction, the contact surface between the connecting member and the moving blade is set as an inclined surface; while in the retraction direction, the contact surface between the connecting member and the moving blade is set as a straight surface. During feeding, the connecting member drives the moving blade to generate a driving force. Due to the existence of the inclined surface, the driving force will be decomposed into a first component force moving along the feed direction and a second component force pressing downward in the vertical direction. This second component force can effectively prevent the cutting edges of the moving blade and the fixed blade from separating, resulting in good shearing effect. And during the entire feeding process, the lock nut does not need to provide too large a locking force in the vertical direction; while during retraction, the connecting block only generates a force along the retraction direction and does not generate a force in the vertical direction. The forces on the moving blade and the fixed blade in the vertical direction are small, reducing friction and greatly extending the service life of the tool head assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following further elaborates on the specific embodiments of the present invention with reference to the drawings:

[0022] Figure 1 is a schematic diagram of the whole pruning shear of the present invention;

[0023] Figure 2 is Figure 1 a sectional view of the pruning shear shown;

[0024] Figure 3 is Figure 1 a schematic diagram of the structure of the swing tooth, connecting member and moving blade in the pruning shear shown;

[0025] Figure 4 is Figure 1 a schematic diagram of the structure of the connecting member and the moving blade in the pruning shear shown;

[0026] Figure 5 is Figure 3 a sectional view of the swing tooth, connecting member and moving blade shown;

[0027] Figure 6 is Figure 1 a schematic diagram of the driving force during feeding of the pruning shear shown;

[0028] Figure 7 is an exploded view of the tool head assembly of the pruning shear in the prior art.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following further elaborates on the present invention with reference to the drawings and embodiments.

[0031] Please refer to Figure 1As shown, an embodiment of the present invention relates to a pruning shear 100, which includes a main body housing 1 extending along the front-rear direction, a drive assembly installed in the main body housing 1, a cutter head assembly 2 connected to the front end of the main body housing 1, a trigger 7 installed on the main body housing 1, a hand guard 8 disposed around the trigger 7, a battery installation part 9 located at the rear end of the main body housing 1, and a battery pack 200 inserted into the battery installation part 9. The battery pack 200 provides energy for the drive assembly, and the drive assembly drives the cutter head assembly 2 to open or close for shearing branches and the like.

[0032] In this embodiment, the above-mentioned trigger 7 is disposed adjacent to the cutter head assembly 2, and the main body housing between the trigger 7 and the battery installation part 9 forms a gripping portion for the user's palm to grip; the setting of the hand guard 8 protects the user's fingers and also prevents the trigger 7 from being accidentally touched.

[0033] In this embodiment, the above-mentioned battery pack 200 is detachably installed in the battery installation part 9 to quickly and conveniently replace the battery pack 200, or to charge the battery pack 200 after removal; in addition, the pruning shear 100 can be sold as a bare machine (i.e., without a battery pack), effectively reducing the user's purchase cost.

[0034] Please refer to Figure 2 As shown, the above-mentioned drive assembly includes a motor 4 installed in the main body housing 1, a reduction mechanism 5 connected to the front end of the motor 4, a transmission gear 6 driven by the reduction mechanism 5, a swing tooth 3 connected to the transmission gear 6, and a control assembly 10 connected to the motor 4. The swing tooth 3 is connected to the cutter head assembly 2, and the trigger 7 is connected to the control assembly 10. When the user presses the trigger 7, the control assembly 10 is triggered and the motor 4 is driven to rotate forward or backward to drive the cutter head assembly 2 to perform reciprocating shearing.

[0035] Please refer to Figure 7 As shown, in the prior art, the cutter head assembly 2 includes a head shell 21 fixed to the front end of the main body housing 1, a fixed cutter 22 fixed to the head shell 21, a movable cutter 23 connected to the swing tooth 3, a connecting member 24' disposed between the swing tooth 3 and the movable cutter 23, and a locking member 25 and a locking nut 26 installed on the head shell 21. Taking the direction in which the movable cutter 23 approaches the fixed cutter 22 for shearing as the feed direction, and the direction in which the movable cutter 23 moves away from the fixed cutter 22 for separation as the retraction direction, in the vertical direction perpendicular to the feed direction, the swing tooth 3, the movable cutter 23, and the fixed cutter 22 are arranged in sequence from top to bottom; and after the locking member 25 passes through the swing tooth 3, the movable cutter 23, the fixed cutter 22, and the head shell 21 in sequence, it is then locked by the locking nut 26.

[0036] Specifically, in the prior art, the head shell 21 includes a mounting seat 211 connected to the main body shell 1, a connecting seat 212 extending forward from the front end of the mounting seat 211, and an engaging groove 213 penetrating through the connecting seat 212. The engaging groove 213 is opened on the front side of the mounting seat 211. The transmission gear 6 passes through the mounting seat 211 and extends into the engaging groove 213. The front end of the transmission gear 6 is a bevel gear 61. The transmission gear 6 is engaged with the swing tooth 3 via the bevel gear 61, and the swing tooth 3 then drives the moving blade 23 to move, so that the moving blade 23 makes a reciprocating shearing motion relative to the fixed blade 22.

[0037] Furthermore, in the prior art, the connecting member 24' is a cylindrical pin. The swing tooth 3 and the cylindrical pin are connected as a whole by interference fit. Then, the swing tooth 3 drives the moving blade 23 to swing reciprocally via the cylindrical pin to achieve the feeding action or the retracting action. However, the cylindrical pin can only provide the shearing force in the feeding direction, and the edge parts of the moving blade 23 and the fixed blade 22 will be separated under force, so that the edges of the moving blade 23 and the fixed blade 22 are not in the same plane during shearing, thus affecting the shearing quality.

[0038] Please refer to Figures 3 to 5 As shown, different from the cylindrical pin in the prior art, in this embodiment, the above-mentioned connecting member 24 includes a first part 241 received in the moving blade 23 and a second part 242 received in the swing tooth 3. Correspondingly, the moving blade 23 includes a first groove 231 for receiving the first part 241, and the swing tooth 3 includes a second groove 31 corresponding to the second part 242. Moreover, the first part 241 and the second part 242 are of an integral structure, which is convenient for manufacturing and assembly.

[0039] Please combine with Figure 6As shown, in the feed direction, the contact surface between the first part 241 and the moving blade 23 is an inclined surface 243; while in the retraction direction, the contact surface between the first part 241 and the moving blade 23 is a straight surface 244. When the pruning shear 100 feeds, the swing tooth 3 drives the connecting member 24, and the connecting member 24 then drives the moving blade 23 via the inclined surface 243 to generate a driving force F. Due to the existence of the inclined surface 243, the driving force F will be decomposed into a first component force F1 moving along the feed direction and a second component force F2 pressing downward in the vertical direction. The first component force F1 acts on the moving blade 23 to make the moving blade 23 approach the fixed blade 22 for shearing, and the second component force F2 acts on the moving blade 23 to make the moving blade 23 and the fixed blade 22 fit more closely during the shearing process, so as to effectively prevent the cutting edges of the moving blade 23 and the fixed blade 22 from separating. The shearing effect is good, and during the entire feeding process, the lock nut does not need to provide too much locking force in the vertical direction; while during retraction, the connecting block 24 drives the moving blade 23 by the straight surface 244. Only a force along the retraction direction will be generated during the retraction process, and no force in the vertical direction will be generated. The force in the vertical direction between the moving blade 23 and the fixed blade 22 is small, and the friction is reduced, greatly improving the service life of the cutter head assembly 2.

[0040] Please refer to Figure 5 As shown, the second part 242 includes a front end 245 in contact with the swing tooth 3 in the feed direction and a rear end 246 in contact with the swing tooth 3 in the retraction direction. The front end 245 and the rear end 246 are parallel to each other, and the rear end 246 and the straight surface 244 are in the same plane, so that the force on the entire connecting member 24 is more uniform and the service life of the connecting member 24 is extended.

[0041] In this embodiment, the inclined surface 243 extends from the end of the front end 245 towards the straight surface 244.

[0042] Furthermore, the connecting member 24 has a clearance fit with both the swing tooth 3 and the moving blade 23.

[0043] Please refer to again Figure 4 As shown, the moving blade 23 includes a through hole 232 for the locking member 25 to pass through and a cutting portion 233 arranged along the feed direction. The first groove 231 is located between the through hole 232 and the cutting portion 233.

[0044] For the pruning shear 100 of the present invention, in the feed direction, the contact surface between the connecting member 24 and the moving blade 23 is set as an inclined surface 243; while in the retraction direction, the contact surface between the connecting member 24 and the moving blade 23 is set as a straight surface 244. During feeding, the connecting member 24 drives the moving blade 23 to generate a driving force F. Due to the existence of the inclined surface 243, the driving force F will be decomposed into a first component force F1 moving along the feed direction and a second component force F2 pressing downward in the vertical direction. This second component force F2 can effectively prevent the cutting edges of the moving blade 23 and the fixed blade 22 from separating, resulting in good shearing effect. And during the entire feeding process, the locking nut does not need to provide too large a locking force in the vertical direction; while during retraction, the connecting block 24 only generates a force along the retraction direction and does not generate a force in the vertical direction. The forces on the moving blade 23 and the fixed blade 22 in the vertical direction are small, and the friction is reduced, greatly improving the service life of the cutter head assembly 2.

[0045] The present invention is not limited to the above specific embodiments. It is easy for those of ordinary skill in the art to understand that, without departing from the principle and scope of the present invention, there are many other alternative solutions for the pruning shear of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. A pruning shear, comprising a main body housing, a driving assembly installed within the main body housing, and a cutter head assembly connected to the front end of the main body housing. The cutter head assembly includes a head housing fixed to the front end of the main body housing, a fixed cutter blade fixed to the head housing, and a movable cutter blade connected to the driving assembly. The driving assembly drives the movable cutter blade to move, so that the movable cutter blade makes a reciprocating shearing action relative to the fixed cutter blade; characterized in that: The driving assembly includes a swing tooth connected to the moving blade. The tool head assembly includes a connecting member disposed between the swing tooth and the moving blade. The connecting member includes a first portion received in the moving blade and a second portion received in the swing tooth. The second portion includes a front end in contact with the swing tooth in the feed direction and a rear end in contact with the swing tooth in the retraction direction. In the feed direction, the contact surface between the first portion and the moving blade is an inclined surface; In the retraction direction, the contact surface between the first portion and the moving blade is a straight surface; the front end and the rear end are parallel to each other, and the rear end and the straight surface are located in the same plane; The inclined surface extends obliquely from the end of the front end towards the straight surface. The first portion further includes a bottom surface connected between the inclined surface and the straight surface. The length of the projection of the inclined surface on the bottom surface is greater than the length of the bottom surface; The moving blade includes a first groove for receiving the first portion, and the swing tooth includes a second groove corresponding to the second portion. The first groove does not penetrate the moving blade in the vertical direction, and the second groove does not penetrate the swing tooth in the vertical direction.

2. The pruning shear according to claim 1, characterized in that: The first portion and the second portion are of an integral structure.

3. The pruning shear according to claim 1, characterized in that: The driving assembly includes a motor installed in the main body housing, a reduction mechanism connected to the front end of the motor, and a transmission gear driven by the reduction mechanism. The transmission gear extends into the head housing and meshes with the swing tooth.

4. The pruning shear according to claim 3, characterized in that: In the vertical direction perpendicular to the feed direction, the swing tooth, the moving blade, and the fixed blade are arranged in sequence from top to bottom.

5. The pruning shear according to claim 4, characterized in that: The tool head assembly includes a locking member and a lock nut installed on the head housing. After the locking member passes through the swing tooth, the moving blade, the fixed blade, and the head housing in sequence, it is then locked by the lock nut.

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