Labor-saving branch pruning device

Abstract

The application discloses a labor-saving branch pruning device, which comprises a fixed cutter head, a movable cutter head, a handle and a trigger, the fixed cutter head is fixed at the front end of the handle, the movable cutter head is rotationally connected at the front end of the handle, the movable cutter head is connected with a push-pull rod, the push-pull rod is provided with a middle gear, the two sides of the push-pull rod are provided with a first sliding rod and a second sliding rod, the first sliding rod and the second sliding rod are provided with a rack on the side facing the middle gear and the bottom; the rack on the side of the first sliding rod is engaged with the middle gear, the rack at the bottom is engaged with the first sector gear through a first idler; the rack on the side of the second sliding rod is engaged with the middle gear, and the rack at the bottom is engaged with the second sector gear through a second idler; the trigger is connected with the first sector gear, and the second sector gear is driven to rotate through an elastic element. The application can automatically adjust the transmission ratio according to the pruning strength, improve the pruning efficiency, and save more labor when pruning large branches.

Description

Technical Field

[0001] This invention relates to the field of branch pruning technology, and in particular to a labor-saving branch pruning device. Background Technology

[0002] Pruning is an important part of garden, orchard, or forestry management, involving the removal of excess branches using pruning devices. During pruning, different branches have different diameters, requiring varying degrees of force. Smaller branches need to be cut quickly, while larger branches require greater pruning force. Current pruning devices do not automatically adjust the transmission ratio between the trigger and the moving blade. This results in slow blade movement and low efficiency when pruning small branches, and fails to achieve a labor-saving effect when pruning large branches, making the pruning process arduous. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention provides a labor-saving branch pruning device that can automatically adjust the transmission ratio according to the pruning force, thereby improving pruning efficiency and making it more labor-saving when pruning large branches.

[0004] To achieve the above objectives, the technical solution of this invention is implemented as follows:

[0005] A labor-saving branch pruning device includes a fixed blade head, a movable blade head, a handle, and a trigger. The fixed blade head is fixed to the front end of the handle, and the movable blade head is rotatably connected to the front end of the handle. The movable blade head is connected to a push-pull rod, which has an intermediate gear. The push-pull rod has a first slide rod and a second slide rod on both sides. Both the first and second slide rods have racks on their sides facing the intermediate gear and at their bottom. The rack on the side of the first slide rod meshes with the intermediate gear, and the rack at its bottom meshes with a first sector tooth via a first idler gear. The rack on the side of the second slide rod meshes with the intermediate gear, and the rack at its bottom meshes with the first sector tooth via a first idler gear. The rack meshes with the second sector tooth via a second idler gear; the trigger is connected to the first sector tooth and drives the second sector tooth to rotate via an elastic element; one end of the second slide rod is rotatably connected to a lever, the other end of the lever is provided with a first wedge block and a spring plate, and a check plate is provided in the middle; the handle is provided with a check tooth; after the first slide rod moves backward a preset distance relative to the second slide rod, it pushes the first wedge block to rotate the lever and inserts the check plate into the check tooth to restrict the movement of the second slide rod; the handle is provided with a first spring to push the push-pull rod, the first slide rod, and the second slide rod forward to the initial position.

[0006] Furthermore, the movable cutter head is provided with a sliding groove, and the front end of the push-pull rod is provided with a cylindrical protrusion. The protrusion is inserted into the sliding groove. When the push-pull rod moves backward, it drives the movable cutter head to turn towards the fixed cutter head. When the push-pull rod moves forward, it drives the movable cutter head away from the fixed cutter head.

[0007] Furthermore, the side of the lever is provided with a groove, and the elastic element includes a second spring and a second wedge block. The second wedge block slides along the groove, and the second spring is disposed in the groove. Under normal circumstances, the second spring pushes part of the second wedge block out of the groove, and the inclined surface of the wedge block faces the second sector tooth. When the wedge block pushes the second sector tooth with a force greater than the set force, the wedge block retracts into the groove.

[0008] Furthermore, the handle is connected to a first guide rail, a second guide rail, and a third guide rail. The first slide rod is slidably connected to the first guide rail, the second slide rod is slidably connected to the second guide rail, and the push-pull rod is slidably connected to the third guide rail.

[0009] Furthermore, the movable cutter head is provided with a cutting edge.

[0010] Furthermore, the first sector tooth and the second sector tooth are rotatably connected to the handle, and a rotating shaft is connected to the upper end of the trigger, the rotating shaft being fixedly connected to the first sector tooth.

[0011] Furthermore, the trigger is arc-shaped.

[0012] Furthermore, the handle is provided with a cavity, and the push-pull rod, the first slide rod, the second slide rod, the first idler wheel, the second idler wheel, and the rack are all located in the cavity.

[0013] The beneficial effects of this invention are as follows: when the force required to prune branches exceeds a preset value, the second sliding rod is locked. At this time, only the first sliding rod moves to drive the push rod, and the transmission ratio of the trigger to the push-pull rod changes from 1:1 to 2:1. The trigger is now in a force-saving state, allowing for more effortless branch pruning. This invention can automatically adjust the transmission ratio according to the pruning force, improving pruning efficiency and making it more effortless when pruning large branches. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a labor-saving branch pruning device according to an embodiment of this application;

[0015] Figure 2 This is a schematic diagram of the transmission mechanism, cutter head, and trigger in the embodiments of this application;

[0016] Figure 3 This is a schematic diagram of the transmission mechanism, cutter head, and trigger in the embodiments of this application;

[0017] Figure 4 This is a cross-sectional structural diagram of a labor-saving branch pruning device according to an embodiment of this application;

[0018] Figure 5 Examples of embodiments in this application Figure 1 Enlarged view of region A;

[0019] Explanation of icon numbers:

[0020] 1 Fixed cutter head, 2 Movable cutter head, 3 Handle, 4 Trigger, 5 Push-pull rod, 6 Intermediate gear, 7 First slide rod, 8 Second slide rod, 9 Rack, 10 First idler wheel, 11 First sector tooth, 12 Second idler wheel, 13 Second sector tooth, 14 Elastic element, 15 Lever, 16 First wedge block, 17 Anti-reverse plate, 18 Anti-reverse tooth, 19 First spring, 20 Slide groove, 21 Protrusion, 22 Groove, 23 Second spring, 24 Second wedge block, 25 First guide rail, 26 Second guide rail, 27 Third guide rail, 28 Cutting edge, 29 Rotating shaft, 30 Cavity, 31 Spring plate. Detailed Implementation

[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. In the following description, the expression "some embodiments" refers to a subset of all possible embodiments; however, it should be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0022] It should also be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Example 1

[0024] Please refer to the attached document. Figure 1This application provides a labor-saving branch pruning device, including a fixed blade head 1, a movable blade head 2, a handle 3, and a trigger 4. The fixed blade head 1 is fixed to the front end of the handle 3, and the movable blade head 2 is rotatably connected to the front end of the handle 3. When the movable blade head 2 rotates towards the fixed blade head, it clamps and cuts the branch. The movable blade head 2 is connected to a push-pull rod 5, which drives the movable blade head to swing. When the push-pull rod 5 moves backward, it drives the movable blade head 2 to swing towards the fixed blade head 1; when the push-pull rod 5 moves forward, it drives the movable blade head 2 to swing away from the fixed blade head 1. The push-pull rod 5 is provided with an intermediate gear 6, which is rotatably connected to the push-pull rod 5. The push-pull rod 5 has a first sliding rod 7 and a second sliding rod 8 on both sides. 8. A rack 9 is provided on both the side facing the intermediate gear 6 and at the bottom. The rack 9 on the side of the first slide rod 7 meshes with the intermediate gear 6, and the rack 9 at the bottom meshes with the first sector tooth 11 through the first idler wheel 10. The rack 9 on the side of the second slide rod 8 meshes with the intermediate gear 6, and the rack 9 at the bottom meshes with the second sector tooth 13 through the second idler wheel 12. The rack 9 on the sides of the first slide rod 7 and the second slide rod 8 mesh with the intermediate gear 6 at the same time. The intermediate gear 6 can rotate when it moves back and forth. When the first slide rod 7 and the second slide rod 8 move back and forth at the same time, the transmission ratio between the first slide rod 7 and the second slide rod 8 and the push-pull rod 5 is 1. When the second slide rod 8 is fixed and the first slide rod 7 moves back and forth, the transmission ratio between the first slide rod 7 and the push-pull rod 5 is 2:1. The racks 9 at the bottom of the first slide bar 7 and the second slide bar 8 mesh with the first sector teeth 11 and the second sector teeth 13 through the first idler wheel 10 and the second idler wheel 12. When the first sector teeth 11 rotates, it drives the first idler wheel 10 and the rack 9 of the first slide bar 7 to move. When the second sector teeth 13 rotates, it drives the second idler wheel 12 and the rack 9 of the second slide bar 8 to move. The trigger 4 is connected to the first sector teeth 11 and pushes the second sector teeth 13 to rotate through the elastic element 14. When the trigger 4 is pulled backward, it directly drives the first sector teeth 11 to rotate. The rotation angle of the first sector teeth 11 is consistent with the rotation angle of the trigger 4. At the same time, it pushes the second sector teeth 13 to rotate through the elastic element 14. However, due to the deformation caused by the elastic element 14, when the force required to prune the branches is greater than the preset value, the difference in rotation angle between the second sector teeth 13 and the first sector teeth 11 is greater than the preset value. That is, the first slide bar 7 and the second slide bar 8 are positioned relative to each other at a position greater than the preset value.Since the second slide bar 8 of the present invention is rotatably connected to one end of the lever 15, and the other end of the lever 15 is provided with a first wedge block 16 and a spring plate 31, the spring plate 31 contacts the handle 3 and pushes the first wedge block 16 of the lever 15 to contact the first slide bar 7, and a check plate 17 is provided in the middle, and the handle 3 is provided with a check tooth 18, when the first slide bar 7 moves backward a preset distance relative to the second slide bar, it pushes the first wedge block 16 to make the lever 15 rotate, and inserts the check plate 17 into the check tooth 18 to restrict the movement of the second slide bar 8, therefore, the modification When the force required to prune the branches exceeds the preset value, the second slide bar 8 is locked. At this time, only the first slide bar 7 moves to drive the push bar to move. The transmission ratio of the trigger 4 to the push-pull rod 5 changes from 1:1 to 2:1. At this time, the trigger 4 is in a force-saving state, which can prune the branches more effortlessly. The handle 3 is equipped with a first spring 19 to push the push-pull rod 5, the first slide bar 7 and the second slide bar 8 forward to the initial position. After pruning, the first spring 19 pushes the push-pull rod 5, the first slide bar 7 and the second slide bar 8 forward to the initial position to reset, which is convenient for the next pruning.

[0025] Specifically, the movable cutter head 2 is provided with a groove 20, and the front end of the push-pull rod 5 is provided with a cylindrical protrusion 21. The protrusion 21 is inserted into the groove 20. When the push-pull rod moves backward, it drives the movable cutter head 2 to turn towards the fixed cutter head 1. When the push-pull rod moves forward, it drives the movable cutter head 2 away from the fixed cutter head 1. This allows the forward and backward movement of the push-pull rod 5 to open and close the movable cutter head, facilitating the pruning of branches. During the backward movement of the push-pull rod 5, the lever arm of the push-pull rod 5 pushing the movable cutter head 2 remains unchanged, making it convenient for workers to control the pruning force.

[0026] Specifically, the side of the lever 15 is provided with a groove 22, and the elastic element 14 includes a second spring 23 and a second wedge block 24. The second wedge block 24 slides along the groove 22. A part of the second spring 23 is located in the groove 22. In its natural state, the second spring 23 pushes the other part of the second wedge block 24 out of the groove 22, and the inclined surface of the second wedge block faces the second sector tooth 13. When the second wedge block pushes the second sector tooth 13 with a force greater than the set force, the component force of the compression spring on the second wedge block is sufficient to compress the second spring 23, so that the second wedge block overcomes the elastic force of the second spring 23 and retracts into the groove 22. At this time, the second wedge block disengages from the second sector tooth 13, and the second sector tooth 13 is no longer driven to rotate when the trigger 4 is swung. The force of the trigger 4 acts on the first slide rod 7, which facilitates the rotation of the movable cutter head 2.

[0027] Specifically, the handle 3 is connected to a first guide rail 25, a second guide rail 26, and a third guide rail 27. The first slide rod 7 is slidably connected to the first guide rail 25 to improve the stability of the first slide rod 7. The second slide rod 8 is slidably connected to the second guide rail 26 to improve the stability of the second slide rod 8. The push-pull rod 5 is slidably connected to the third guide rail 27 to improve the stability of the push-pull rod 5.

[0028] Specifically, the movable blade 2 is equipped with a blade 28, which makes cutting branches more effortless.

[0029] Specifically, the first sector tooth 11 and the second sector tooth 13 are rotatably connected to the handle 3 to ensure the stability of the rotation of the first sector tooth 11 and the second sector tooth 13. The upper end of the trigger 4 is connected to a rotating shaft 29, which is fixedly connected to the first sector tooth 11. When the trigger 4 rotates, it directly drives the first sector tooth 11 to rotate.

[0030] Specifically, the trigger 4 is arc-shaped for easy gripping.

[0031] Specifically, the handle 3 has a cavity 30, and the push-pull rod 5, the first slide rod 7, the second slide rod 8, the first idler wheel 10, the second idler wheel 12 and the rack 9 are all located in the cavity 30, which can play a protective role.

[0032] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A labor saving branch pruning device characterized by, The utility model provides a knife, including fixed blade, movable blade, handle and trigger, the fixed blade is fixed in the front end of handle, the movable blade rotatory connection is in the front end of handle, the movable blade is connected with push -and -pull rod, is equipped with intermediate gear on the push -and -pull rod, the both sides of push -and -pull rod are equipped with first sliding bar and second sliding bar, first sliding bar and second sliding bar are equipped with rack in the side and bottom towards intermediate gear, the rack of first sliding bar side surface is engaged with intermediate gear, and the rack of bottom is engaged with first sector gear through first idler, the rack of second sliding bar side surface is engaged with intermediate gear, and the rack of bottom is engaged with second sector gear through second idler, the trigger is connected with first sector gear, and the second sector gear is pushed to rotate through elastic member, one end of the dolly is rotatoryly connected with second sliding bar, the other end of dolly is equipped with first wedge and spring piece, and the middle is equipped with anti -back piece, handle is equipped with anti -back tooth, first sliding bar is pushed to the first wedge after moving back to the preset distance relative to second sliding block, makes the dolly rotate, and inserts the anti -back piece into the anti -back tooth to restrict the movement of second sliding bar, handle is equipped with the first spring of push -and -pull rod, first sliding bar and second sliding bar are pushed to move to the initial position forward.

2. A labor saving branch pruning apparatus according to claim 1, wherein The movable blade is provided with a sliding groove, the front end of the push-and-pull rod is provided with a cylindrical protrusion, the protrusion is inserted into the sliding groove, and when the push-and-pull rod moves backward, the movable blade is turned towards the fixed blade, and when the push-and-pull rod moves forward, the movable blade moves away from the fixed blade.

3. A labor saving branch pruning apparatus according to claim 1, wherein The side surface of the dolly is provided with a groove, the elastic member includes a second spring and a second wedge, the second wedge slides along the groove, the second spring is arranged in the groove, and when the second spring is naturally lowered, the part of the second wedge that protrudes out of the groove is pushed by the second spring, and the inclined surface of the wedge faces the second sector gear, and when the wedge pushes the second sector gear with a force greater than the set force, the wedge is retracted into the groove.

4. The easy effortful branch trimming device according to claim 1, wherein, The handle is connected with a first guide rail, a second guide rail and a third guide rail, the first sliding bar is slidingly connected with the first guide rail, the second sliding bar is slidingly connected with the second guide rail, and the push-and-pull rod is slidingly connected with the third guide rail.

5. The easy effortful branch trimming device according to claim 1, wherein, The movable blade is provided with a blade edge.

6. A labor saving branch pruning apparatus according to claim 1, wherein The first sector gear and the second sector gear are rotatably connected with the handle, and the trigger is connected with a rotating shaft at the upper end, and the rotating shaft is fixedly connected with the first sector gear.

7. The easy effortful branch trimming device according to claim 1, wherein, The trigger is arc-shaped.

8. The easy effortful branch trimming device according to claim 1, wherein, The handle is provided with a cavity, and the push-and-pull rod, the first sliding bar, the second sliding bar, the first idler, the second idler and the rack are arranged in the cavity.

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