A claw sickle for harvesting millet

Abstract

This utility model provides a claw sickle for harvesting millet, including a main body plate. The main body plate is rectangular and gradually thins from top to bottom in the width direction. The lower end of the main body plate extends to one end face in the thickness direction to form a blade. An arc-shaped notch is opened in the center of the long side of the main body plate, and an arc-shaped baffle is provided above the arc-shaped notch. The edge of the arc-shaped notch and the edge of the adjacent arc-shaped baffle form a thumb hole. By setting a thumb hole formed by the arc-shaped notch and the arc-shaped baffle at the upper part of the main body plate, the traditional rope loop is replaced, providing a stable space for the thumb to pass through and avoiding thumb slippage and deviation, thereby reducing the difficulty of operation. By designing the main body plate to gradually thin from top to bottom in the width direction and extending to one end face in the thickness direction at the lower end to form a blade, the blade contacts the ear handle to form a preset fitting angle, reducing the frequency and force of large-angle turning of the wrist, thereby reducing physical exertion.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural implements technology, specifically relating to a claw sickle for harvesting millet. Background Technology

[0002] In the hilly and mountainous areas of southern my country, the scattered sloping lands of northern China, and among millet farmers, manual harvesting remains a common practice due to limitations in land conditions and the higher economic costs associated with machine harvesting. The main tools for manual millet harvesting include sickles, scissors, and pickaxes. The pickaxe is a traditional tool used in my country for harvesting millet, specifically for cutting the ears of grain. Figure 6 As shown, a traditional claw sickle includes a rectangular iron plate 8 with a sharp blade on one side. The opposite edge is covered with a protective fabric 9 to prevent hand discomfort, and holes are provided at both ends of this side. A rope 10 is threaded through the holes and tied into a knot to form a loop for the thumb. In use, the right thumb is inserted into the loop, with the pad of the thumb pressing against one end of the iron plate, while the other four fingers are positioned on the other side. Through the coordination of the four fingers and the wrist, the blade is pressed against the ear of grain, and then the wrist is used to rotate and exert force to harvest the grain.

[0003] The following drawbacks exist when using traditional claw sickles: 1. When using a traditional claw sickle, the thumb relies on the restraint of the loop and the contact between the fingertip and the end face of the sickle for positioning. During harvesting, the thumb is prone to sliding and deviating on the end face of the sickle, requiring extra force to maintain the grip, resulting in higher operating difficulty, especially for beginners. During operation, the thumb is only fixed by the restraint of the loop, and it is easy to deviate due to wrist turning force, requiring frequent pauses to adjust the hand position to align with the ear stalk, making it difficult to master. 2. During harvesting, the contact between the blade and the ear stalk depends on precise wrist control, requiring constant large-angle wrist turning force and additional force to cut the millet ear stalk. After prolonged operation, the wrist and fingers are prone to soreness. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, this utility model provides a claw sickle for harvesting millet.

[0005] The technical solution adopted by this utility model is: a claw sickle for harvesting millet, including a main plate, the main plate is rectangular, its width gradually decreases from top to bottom, the lower end of the main plate extends to one side of its thickness direction to form a blade, an arc-shaped notch is opened in the center of the long side of the main plate, and an arc-shaped baffle is provided above the arc-shaped notch; the edge of the arc-shaped notch and the edge of the adjacent arc-shaped baffle surround each other to form a thumb hole.

[0006] The arc-shaped baffle has a semi-circular cross-section along its own central axis, and the outer periphery of the arc-shaped baffle is an arc segment; the arc segment is located in a plane perpendicular to the central axis, and the center of the arc segment falls on the central axis. Extending the arc segment completely along its center can form a regular circle; the angle α between the central axis of the arc-shaped baffle and one end face of the main plate in the thickness direction is 45°-75°.

[0007] The end face of the arc-shaped baffle corresponding to the central axis of the main plate in the thickness direction, and the end face of the main plate corresponding to the extension of the blade in the thickness direction, are two end faces that are opposite to each other in the thickness direction of the main plate.

[0008] The included angle β between one end face of the main plate in the thickness direction and its adjacent blade side is 100°-170°.

[0009] The included angle β is 135°.

[0010] The inner wall of the arc-shaped baffle is provided with a first groove for adapting to the thumb metacarpophalangeal joint during operation.

[0011] On one end face of the arc-shaped baffle corresponding to the thickness direction of the main plate along the central axis, a second groove is provided for fitting the thumb pad during operation, and the inner wall of the second groove is provided with anti-slip abrasive particles.

[0012] The edges of the thumb hole are rounded.

[0013] Beneficial effects: 1. Simple to use and reduced operation difficulty: By setting a thumb through hole formed by an arc-shaped notch and an arc-shaped baffle on the upper part of the main plate, replacing the traditional rope loop, a stable space is provided for the thumb to pass through, preventing the thumb from slipping and deviating. At the same time, by setting a first groove on the inner wall of the arc-shaped baffle to fit the thumb metacarpophalangeal joint, and a second groove on the end face of the main plate to fit the thumb pad, the double fitting structure further restricts the relative displacement of the thumb, significantly reducing the learning difficulty for beginners and users with little operating experience. 2. Effortless operation and reduced physical exertion: By designing the main plate to gradually thin from top to bottom in the width direction, and extending the lower end to one side of the thickness direction to form a blade, the blade contacts the ear stalk at a preset fitting angle, reducing the frequency of large-angle wrist turning and the extra force required to cut the ear stalk, avoiding wrist and finger soreness after long-term operation. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a front view of the present utility model;

[0016] Figure 3 This is a right view of the present invention;

[0017] Figure 4 For this Figure 3 A magnified view of a section at point A in the middle;

[0018] Figure 5 This is a structural schematic diagram of the plane containing the circular cross-section of the arc-shaped baffle of this utility model;

[0019] Figure 6 This is a three-dimensional structural diagram of a claw sickle in the prior art;

[0020] Marked in the diagram: 1. Main body plate; 2. Blade; 3. Arc-shaped notch; 4. Arc-shaped baffle; 5. Thumb hole; 6. First groove; 7. Second groove; 8. Iron plate; 9. Fabric; 10. Rope. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-6 As shown, the technical solution adopted by this utility model is: a claw sickle for harvesting millet, including a main body plate 1, the main body plate 1 is rectangular, and its width gradually decreases from top to bottom. The lower end of the main body plate 1 extends to one side of its thickness direction to form a blade 2. An arc-shaped notch 3 is opened in the center of the upper long side of the main body plate 1, and an arc-shaped baffle 4 is provided above the arc-shaped notch 3. The edge of the arc-shaped notch 3 and the edge of the adjacent arc-shaped baffle 4 surround each other to form a thumb through hole 5. The principle of the above setting is: when in use, the user inserts his right thumb into the thumb through hole 5 formed by the arc-shaped notch 3 and the arc-shaped baffle 4 on the upper part of the main body plate 1. The structural constraint of the thumb through hole 5 enables the thumb to be quickly positioned, replacing the loose binding of the traditional rope 10 loop. It can effectively limit the lateral sliding and displacement of the thumb during operation, and a stable grip can be formed without additional force. Meanwhile, the lower end of the main plate 1 extends to one side of its thickness direction to form a blade 2, giving the blade 2 an initial angle. When the blade 2 contacts the ear stalk, a preset matching angle is formed, reducing the frequency of large-angle wrist turning and force exertion, reducing the extra force required to cut the ear stalk, and avoiding wrist and finger soreness after long-term work.

[0023] The arc-shaped baffle 4 has a semi-circular cross-section along its central axis, and its outer periphery is an arc segment. This arc segment lies in a plane perpendicular to the central axis, and its center lies on the central axis. Extending the arc segment along its center forms a regular circle. The angle α between the central axis of the arc-shaped baffle 4 and one end face of the main body plate 1 in the thickness direction is 45°-75°. In this setting, the angle α optimizes the matching degree between the thumb's force direction and the cutting direction of the blade 2. This angle allows the thumb to naturally form a force-applying posture tilted towards the blade 2 after passing through the through hole, allowing the thumb's grip force to be efficiently transmitted to the main body plate 1, and then transmitted to the blade 2 through the structure of the main body plate 1. This avoids force dispersion, reduces the extra force required to cut the tassel handle, and prevents wrist and finger soreness after prolonged operation. At the same time, this angle adapts to the physiological angle of the human hand when it is naturally bent, reducing the extra force generated by the wrist due to posture distortion, further improving the ease and sustainability of operation.

[0024] The end face of the arc-shaped baffle 4 corresponding to the central axis of the main body plate 1 in the thickness direction, and the end face of the blade 2 corresponding to the extension of the main body plate 1 in the thickness direction, are two end faces that are opposite to each other in the thickness direction of the main body plate 1. The purpose of this setting is to clarify that the end face of the main body plate 1 corresponding to the arc-shaped baffle 4 and the end face of the main body plate 1 corresponding to the extension of the blade 2 are on opposite sides in the thickness direction of the main body plate 1. This will prevent the two from interfering with each other in terms of force and cutting, and making the tool unusable, which would occur if they were on the same side. It will also allow the force of the thumb to be stably transmitted to support the cutting action. Structurally, this ensures that the tool can achieve its core function and improves the effectiveness of operation.

[0025] The included angle β between one end face of the main body plate 1 in the thickness direction and the adjacent side face of the blade 2 is 100°-170°. Specifically, if the included angle is too large, such as greater than 170°, the blade 2 will be too steep, and when it contacts the ear stalk, it can only rely on the tip of the blade to exert force, which is easy to slip and requires extra force to cut. If the included angle β is too small, such as less than 100°, the blade 2 will be too flat, like "shoveling" rather than "cutting", which not only makes it difficult to accurately hold the ear stalk, but also disperses the hand force to the main body plate 1 and cannot be concentrated to the blade edge. The range of 100°-170° allows the side face of the blade 2 to form a moderately inclined angle with the end face of the main body plate 1, which not only makes it easy for the blade 2 to naturally fit the ear stalk, but also allows the force of the wrist and fingers to be directly transmitted to the blade edge. This setting reflects the scientific rationality of this utility model.

[0026] The included angle β is 135°; this setting is a further optimization of the included angle β.

[0027] The inner wall of the arc-shaped baffle 4 is provided with a first groove 6 for adapting to the thumb metacarpophalangeal joint during operation. The function of the first groove 6 is to adapt to the thumb metacarpophalangeal joint, thereby structurally enhancing grip stability and reducing hand fatigue. Specifically, during operation, the top of the thumb metacarpophalangeal joint can naturally embed into the groove. The groove can physically limit the joint, avoiding the problem of joint displacement and sliding when there is no adapting structure in traditional claw sickles. This allows the thumb to stably fit the arc-shaped baffle 4 without having to exert extra force to maintain the posture.

[0028] On one end face of the arc-shaped baffle 4, corresponding to the thickness direction of the main body plate 1, a second groove 7 is provided for fitting the thumb pad during operation. The inner wall of the second groove 7 is provided with anti-slip abrasive particles. In this configuration, the second groove 7 fits the arc-shaped contour of the thumb pad, allowing the finger pad to naturally embed into the groove, avoiding the problem of the finger pad easily slipping when in traditional flat contact. Stable positioning of the thumb can be achieved without additional force. The anti-slip abrasive particles on the inner wall of the groove can increase the friction between the finger pad and the end face of the main body plate 1. Even if the hand is sweaty or there is vibration during operation, it can prevent the thumb from slipping, ensuring that the force applied by the thumb can be efficiently transmitted to the main body plate 1 and then to the blade 2. This improves grip stability and ensures the effectiveness of force application during cutting.

[0029] The thumb through hole 5 has rounded edges. This design improves operational safety and comfort. When using this invention, the right thumb is inserted into the thumb through hole 5 formed by the arc-shaped notch 3 and the arc-shaped baffle 4 on the upper part of the main body plate 1. The thumb is positioned by the structural constraint of the thumb through hole 5. At this time, the right hand grips the lower edge of the thumb through hole 5, and the thumb metacarpophalangeal joint is located near the upper edge of the thumb through hole 5. The rounded edges of the thumb through hole 5 significantly reduce friction damage between the thumb and the edge of the through hole during operation. At the same time, the rounded edges make it smoother for the thumb to enter and move, ensuring operational comfort and safety.

[0030] Specific working principle: When in use, the user inserts their right thumb into the thumb through hole 5 formed by the arc-shaped notch 3 and the arc-shaped baffle 4 on the upper part of the main body plate 1. The top of the thumb's metacarpophalangeal joint naturally embeds into the first groove 6 on the inner wall of the arc-shaped baffle 4, while the thumb pad fits into the second groove 7 on the end face of the main body plate 1 corresponding to the central axis of the arc-shaped baffle 4. With the structural constraint of the thumb through hole 5, the physical limitation of the metacarpophalangeal joint by the first groove 6, and the adaptation of the thumb pad by the second groove 7, the thumb can be quickly positioned. At the same time, the anti-slip abrasive particles on the inner wall of the second groove 7 can increase the friction between the thumb pad and the end face of the main body plate 1, effectively limiting the lateral sliding and displacement of the thumb during operation. A stable grip can be formed without additional force, and the rounded corner treatment of the thumb through hole 5 can prevent friction damage between the thumb and the edge of the through hole during operation, making the thumb insertion and movement smoother. At this time, the central axis of the arc-shaped baffle 4 forms an angle α of 45°-75° with one end face of the main body plate 1 in the thickness direction, so that the thumb naturally forms a force-generating posture tilted towards the blade 2. This angle is adapted to the physiological angle of the natural bending of the human hand, reducing the extra force generated by the wrist due to the twisting of the posture. At the same time, the end face of the arc-shaped baffle 4 corresponding to the main body plate 1 and the end face of the blade 2 extending to the main body plate 1 are opposite in the thickness direction, ensuring that the force-generating end of the hand is separated from the cutting end of the blade 2, and there will be no interference between the force generation and the cutting, so that the gripping force of the thumb can be efficiently transmitted to the blade 2 along the main body plate 1. The width of the main plate 1 gradually decreases from top to bottom, and its lower end extends to one side of the thickness direction to form the blade 2. The included angle β between the end face of the main plate 1 in the thickness direction and the side of the adjacent blade 2 is 100°-170° (preferably 135°). This angle allows the blade 2 to form a moderate inclination with the end face of the main plate 1, which not only makes it easy for the blade 2 to naturally fit the ear of grain, but also avoids the problem that the blade 2 is too steep and easy to slip and requires extra force due to an excessively large included angle, or that the blade 2 is too flat and difficult to catch the ear of grain and the force is dispersed due to an excessively small included angle. This allows the force of the wrist and fingers to be directly transmitted to the blade edge. During operation, the user uses the coordination of four fingers and wrist, with the overall support of the main plate 1, to make the blade 2 fit precisely against the ear stalk. Then, by turning the wrist to exert force, the ear stalk can be cut off efficiently to complete the harvesting of the grain. Compared with traditional claw sickles, it is simple to operate, and the whole process does not require frequent adjustment of hand position or application of too much extra force. It can reduce the soreness of the wrist and fingers after long-term operation, and ensure the labor-saving, continuous and effective operation.

Claims

1. A claw sickle for harvesting millet, characterized by: It includes a main body plate, which is rectangular in shape and gradually thins from top to bottom in the width direction. The lower end of the main body plate extends to one side of its thickness direction to form a blade. An arc-shaped notch is opened in the center of the long side of the main body plate, and an arc-shaped baffle is provided above the arc-shaped notch. The edge of the arc-shaped notch and the edge of the adjacent arc-shaped baffle are surrounded to form a thumb hole.

2. The claw sickle according to claim 1, wherein: The angle α between the central axis of the arc-shaped baffle and one end face of the main plate in the thickness direction is 45°-75°.

3. A claw sickle for harvesting millet according to claim 2, characterized in that: The end face of the arc-shaped baffle corresponding to the thickness direction of the main plate along its central axis and the end face of the blade corresponding to the thickness direction of the main plate along its extension are two end faces that are opposite to each other in the thickness direction of the main plate.

4. The claw sickle according to claim 3, wherein: The included angle β between one end face of the main plate in the thickness direction and its adjacent blade side is 100°-170°.

5. A claw sickle for harvesting millet according to claim 4, characterized in that: The included angle β is 135°.

6. The claw sickle according to claim 1, wherein: The inner wall of the arc-shaped baffle has a first groove for adapting to the thumb metacarpophalangeal joint during operation.

7. The claw sickle according to claim 2, wherein: On one end face of the arc-shaped baffle, corresponding to the thickness direction of the main plate, there is a second groove for fitting the thumb pad during operation, and the inner wall of the second groove is provided with anti-slip abrasive particles.

8. The claw sickle according to claim 1, wherein: The edges of the thumb hole are rounded.

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