Labor-saving lopper saw for forestry

Abstract

The utility model discloses a forestry laborsaving lopper saw belongs to lopper saw technical field, including saw head subassembly and holding pole subassembly, saw head subassembly and holding pole subassembly threaded connection, saw head subassembly includes shell and be equipped with the two saw blade that intersects in the shell, the shell is equipped with the notch that the branch enters, and the notch is equipped with the handle. The intersection point of the two saw blades is located in the notch, one end of each saw blade is rotationally connected with the opening end of the shell, the other end of each saw blade is slidably connected with the shell, and an elastic reset structure is arranged between the movable ends of the two saw blades. The holding rod assembly comprises a plurality of connecting rods. According to the labor-saving lopper saw for forestry, traditional vertical pressing cutting is changed into horizontal push-pull cutting, mechanical optimization is achieved, the push-pull action only needs to overcome the horizontal friction force between the saw blade and branches, and more labor is saved.

Description

Technical Field

[0001] This utility model belongs to the field of high branch saw technology, and in particular relates to a labor-saving high branch saw for forestry. Background Technology

[0002] The high-branch saw is a key tool in garden pruning, fruit tree maintenance, and municipal greening, mainly used for pruning branches at high altitudes (usually above 3 meters). In traditional operation scenarios, the operator needs to operate the sawing mechanism at the top using a long pole (2-5 meters) on the ground to complete the cut.

[0003] However, existing high-branch saws have the following technical drawbacks:

[0004] Existing peg saws (such as the insulated peg saw disclosed in CN212629287U) generally adopt a structure in which a single saw blade is fixed to the top of a long pole. When using them, the operator needs to apply force to the saw blade through the long pole to make the saw blade press tightly against the surface of the branch, so as to achieve a vertical frictional cut between the saw teeth and the branch. However, due to the huge leverage effect formed by the length of the long pole and the distance (lever arm) from the point of force application (the point where the hand holds the saw) to the saw head, the operator needs to apply a lot of downward pressure to maintain effective cutting. Especially when pruning thick branches, the physical exertion is extremely high, and prolonged operation can easily lead to muscle strain.

[0005] Therefore, we propose a labor-saving high-branch saw for forestry to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that the long lever arm of the existing high branch saw makes it difficult to operate, and to propose a labor-saving high branch saw for forestry.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A labor-saving high-branch saw for forestry includes a saw head assembly and a handle assembly, wherein the saw head assembly and the handle assembly are threadedly connected, wherein:

[0009] The saw head assembly includes a housing and two intersecting saw blades disposed inside the housing. The housing has a notch for branches to enter, and the intersection of the two saw blades is located inside the notch. One end of each saw blade is rotatably connected to the opening end of the housing, and the other end is slidably connected to the housing. An elastic reset structure is provided between the movable ends of the two saw blades.

[0010] The grip assembly includes multiple connecting rods, each with an external thread and an internal thread at both ends. The external and internal threads are compatible, and the internal thread at the top is threaded to a connecting post at the end of the housing.

[0011] Preferably, the outer casing includes two side shells, and the side of the two side shells near the notch has a gap for the saw blades to pass through, the width of the gap being adapted to the thickness of the two saw blades.

[0012] Preferably, the saw blade has mounting holes at both ends, and a fixed connecting shaft and a movable connecting shaft are respectively provided in the mounting holes. At least two positioning nuts are threaded onto the fixed connecting shaft and the movable connecting shaft to clamp the saw blade. The fixed connecting shaft is rotatably connected to the opening on the outer shell, and the movable connecting shaft is slidably connected to the outer shell.

[0013] Preferably, the housing is provided with an arc-shaped guide bar, and the movable connecting shaft is slidably connected to the guide bar.

[0014] Preferably, the guide bar is an arc with the axis of the fixed connecting shaft as the center and the distance between the fixed connecting shaft and the movable connecting shaft as the radius.

[0015] Preferably, the elastic reset structure is rotatably mounted on a connecting rod on a movable connecting shaft, and the ends of the two connecting rods are rotatably connected to the same push rod. The push rod passes through the outer shell and extends into a cavity opened inside the connecting column, and a spring is provided between the push rod and the cavity.

[0016] Preferably, the saw teeth of the saw blade are located on the side of the saw blade facing the notch, and the saw teeth of the two saw blades are oriented in opposite directions.

[0017] In summary, the technical effects and advantages of this utility model are as follows: This labor-saving high-branch saw for forestry changes the traditional vertical pressure cutting to horizontal push-pull cutting. The intersection of the two saw blades in the saw head assembly forms a dynamic clamping area. When a branch is pushed into the notch, the movable end of the saw blade is automatically opened by the pressure of the branch. When pulled back, the elastic reset structure drives the saw blade to close, achieving mechanical optimization. The push-pull action only needs to overcome the horizontal friction between the saw blade and the branch (far less than the vertical downward pressure), and the torque direction coincides with the axis of the long rod, avoiding lateral bending torque. Experiments show that when cutting branches of the same diameter (5cm), the pushing force required by this invention is only 38% of the traditional single-saw-blade pulling force, reducing the difficulty of operation and saving more effort.

[0018] During the push-pull process of this forestry labor-saving high-branch saw, the saw teeth of the two saw blades are always in contact with both sides of the branch. The saw teeth grooves of the two saw blades are in opposite directions. During the push and return strokes, the two saw blades take turns serving as the main cutting surface and the auxiliary clamping surface. Compared with the traditional single saw blade, the cutting frequency is doubled. Two effective cuts are completed in a single push-pull cycle, which is equivalent to two round trips of a single saw blade, thus improving the cutting efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the saw head assembly in this utility model;

[0021] Figure 3 This is a schematic diagram of the tooth distribution structure of the two saw blades in this utility model;

[0022] Figure 4 for Figure 1 A magnified structural diagram of part A in the middle.

[0023] In the diagram: 1. Saw head assembly; 11. Housing; 12. Notch; 13. Saw blade; 14. Connecting post; 15. Fixed connecting shaft; 16. Movable connecting shaft; 17. Positioning nut; 18. Guide bar; 19. Elastic reset structure; 191. Connecting rod; 192. Push rod; 193. Spring; 2. Handle assembly; 21. Connecting rod; 22. External thread; 23. Internal thread. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figure 1-3 A labor-saving high-branch saw for forestry includes a saw head assembly 1 and a handle assembly 2, which are threaded together.

[0027] The saw head assembly 1 includes a housing 11 and two intersecting saw blades 13 disposed within the housing 11. The housing 11 has a notch 12 for branches to enter. The intersection of the two saw blades 13 is located within the notch 12. The intersection of the saw blades 13 is the point of action for the saw blades 13 to cut the branches. The intersection of the two saw blades 13 forms a dynamic clamping area. The branches are pushed and pulled within the notch 12 to complete the sawing. One end of the saw blade 13 is rotatably connected to the open end of the housing 11, and the other end is slidably connected to the housing 11. An elastic reset structure 19 is provided between the movable ends of the two saw blades 13. The movable end of the saw blade 13 automatically opens when squeezed by the branches. When pulled back, the elastic reset structure 19 drives the saw blade 13 to close, achieving mechanical optimization. The pushing and pulling action only needs to overcome the horizontal friction between the saw blade 13 and the branches, which is much smaller than the vertical downward pressure. Moreover, the torque direction coincides with the axis of the handle assembly 2, avoiding lateral bending torque, reducing the difficulty of operation, and saving more effort.

[0028] Reference Figure 1-3The outer casing 11 includes two side shells. The side shells near the notch 12 have gaps for the saw blades 13 to pass through. The width of the gaps is adapted to the thickness of the two saw blades 13. The outer casing 11 is formed by two symmetrical side shells fixed by bolts, forming a detachable structure, which facilitates the replacement and installation of the saw blades 13. The side shells near the notch 12 have a gap with a width of 2-3mm. This gap is precisely adapted to the total thickness of the two saw blades 13, which is 1.5-2.5mm. This allows the saw blades 13 to slide freely, prevents tree branches and debris from entering the interior of the outer casing 11, and also stabilizes the saw blades 13.

[0029] Reference Figure 1-3 The saw blade 13 has mounting holes at both ends. A fixed connecting shaft 15 and a movable connecting shaft 16 are respectively installed in the mounting holes. At least two positioning nuts 17 are threaded onto the fixed connecting shaft 15 and the movable connecting shaft 16 to clamp the saw blade 13 and fix it to ensure that the saw blade 13 is more stable during sawing. The fixed connecting shaft 15 is rotatably connected to the opening on the outer shell 11, and the movable connecting shaft 16 is slidably connected to the outer shell 11. The saw blade 13 can rotate freely around the axis of the opening, and the rotation angle range is 0°-30°.

[0030] Reference Figure 1-3 An arc-shaped guide bar 18 is provided inside the outer casing 11. The movable connecting shaft 16 is slidably connected to the guide bar 18. The guide bar 18 is an arc with the axis of the fixed connecting shaft 15 as the center and the distance between the fixed connecting shaft 15 and the movable connecting shaft 16 as the radius, to ensure that the opening and closing trajectory of the saw blade 13 is a smooth arc and to avoid movement jamming.

[0031] Reference Figure 1-3 The elastic reset structure 19 is rotatably mounted on the connecting rod 191 on the movable connecting shaft 16. The ends of the two connecting rods 191 are rotatably connected to the same push rod 192. The push rod 192 passes through the outer shell 11 and extends into the cavity opened inside the connecting column 14. A spring 193 is provided between the push rod 192 and the cavity. The spring 193 is made of stainless steel with a stiffness coefficient of 50-80 N / mm and a pre-compression of 10-15 mm. When the saw blade 13 is spread open by tree branches, the push rod 192 compresses the spring 193 to store energy. After the external force is removed, the spring 193 releases energy and drives the saw blade 13 to reset through the push rod 192 and the connecting rod 191.

[0032] Reference Figure 1-3The saw teeth of the saw blade 13 are located on the side of the saw blade 13 facing the notch 12. During the push-pull process, the saw blade 13 is always in contact with the outer wall of the branch for sawing, and the saw teeth of the two saw blades 13 are in opposite directions. During the push-pull process, the saw teeth of the two saw blades 13 are always in contact with both sides of the branch, and the saw teeth of the two saw blades 13 are in opposite directions. During the push and return strokes, the two saw blades 13 take turns serving as the main cutting surface and the auxiliary clamping surface. Compared with the traditional single-blade high branch saw, the cutting frequency is doubled, and two effective cuts are completed in a single push-pull cycle, which is equivalent to two round-trip movements of a single saw blade, thus improving the cutting efficiency.

[0033] Reference Figure 1 and 4 The grip assembly 2 includes multiple connecting rods 21. Each connecting rod 21 has an external thread 22 and an internal thread 23 at both ends. The external thread 22 and the internal thread 23 are compatible, and the internal thread 23 at the top end is threadedly connected to the connecting post 14 at the end of the housing 11. The length of a single connecting rod 21 is 1.2-1.5m. By connecting them one by one, they can be combined into a long rod of 2-5m to adapt to different working height requirements.

[0034] Working principle:

[0035] Push phase:

[0036] The operator aligns the notch 12 with the branch and pushes it forward. After the branch enters the notch 12, it presses against the intersection of the two saw blades 13, forcing the movable connecting shaft 16 to slide outward along the guide bar 18.

[0037] At this point, the saw teeth of one of the saw blades 13 contact the right side of the branch, forming the main cutting surface; the saw teeth of the other saw blade 13, due to the opposite direction of the tooth grooves, generate an auxiliary clamping force with the left side of the branch to prevent the branch from shifting.

[0038] The spring 193 is compressed to store energy, and the elastic potential energy is converted into the continuous pressing force of the saw blade 13 on the tree branch.

[0039] Return journey phase:

[0040] The operator pulls the grip assembly 2 backward, the spring 193 releases energy, and drives the movable connecting shaft 16 to slide inward through the push rod 192 and the connecting rod 191, so that the saw blade 13 closes and approaches.

[0041] The saw blade 13, which was originally used for auxiliary clamping, forms the main cutting surface with the left side of the tree branch. The saw blade 13, which was originally used for main cutting, is now used for auxiliary clamping, thus completing the reverse cutting.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A labor-saving high branch saw for forestry, comprising a saw head assembly (1) and a handle assembly (2), the saw head assembly (1) and the handle assembly (2) being threadedly connected, characterized in that, Wherein: The saw head assembly (1) comprises a housing (11) and two cross-set saw blades (13) arranged in the housing (11), the housing (11) has a notch (12) for branches to enter, the intersection of the two saw blades (13) is located in the notch (12), and one end of the saw blade (13) is rotatably connected with the opening end of the housing (11), and the other end is slidably connected with the housing (11), and a resilient reset structure (19) is arranged between the movable ends of the two saw blades (13); The handle assembly (2) comprises a plurality of connecting rods (21), the connecting rods (21) are respectively provided with outer thread (22) and inner thread (23) at both ends, the outer thread (22) and the inner thread (23) are matched, and the inner thread (23) at the top is threadedly connected with the connecting column (14) arranged at the end of the housing (11).

2. The labor saving high branch saw for forestry according to claim 1, characterized in that, The housing (11) comprises two side shells, the side close to the notch (12) of the two side shells has a gap for the saw blade (13) to pass through, and the gap width is matched with the thickness of the two saw blades (13).

3. The labor saving high branch saw for forestry according to claim 1, characterized in that, Both ends of the saw blade (13) have mounting holes, the mounting holes are respectively provided with fixed connecting shafts (15) and movable connecting shafts (16), the fixed connecting shafts (15) and the movable connecting shafts (16) are threadedly connected with at least two positioning nuts (17) to clamp the saw blade (13), the fixed connecting shafts (15) are rotatably connected with the openings on the housing (11), and the movable connecting shafts (16) are slidably connected with the housing (11).

4. The labor saving high branch saw for forestry according to claim 3, characterized in that, The housing (11) is provided with an arc-shaped guide strip (18), and the movable connecting shaft (16) is slidably connected with the guide strip (18).

5. The labor saving high branch saw for forestry according to claim 4, characterized in that, The guide strip (18) is an arc with the axis of the fixed connecting shaft (15) as the center and the distance between the fixed connecting shaft (15) and the movable connecting shaft (16) as the radius.

6. The labor saving high branch saw for forestry according to claim 3, wherein The resilient reset structure (19) is a connecting rod (191) rotatably arranged on the movable connecting shaft (16), two ends of the connecting rod (191) are rotatably connected with a same push rod (192), the push rod (192) penetrates through the housing (11) and extends into a cavity formed in the connecting column (14), and a spring (193) is arranged between the push rod (192) and the cavity.

7. The labor saving high branch saw for forestry according to claim 1, wherein The saw teeth of the saw blade (13) are located on the side of the saw blade (13) facing the notch (12), and the saw teeth of the two saw blades (13) are in opposite directions.

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