A two-stage labor-saving slingshot and its launching method

Abstract

This invention discloses a two-stage effort-saving slingshot and its launching method, belonging to the field of compound bow technology. It solves the problems of existing slingshots, such as arduous charging, complex structure, easy performance degradation, and non-standard launching methods. The slingshot includes a bow body and left and right bow wheel assemblies symmetrically arranged on both sides of the bow body. Each bow wheel assembly includes a bow wheel and a ball screw coaxially fixed to it. A large-diameter helical groove at the end of the bow wheel's threaded groove achieves the first stage of effort saving, while the nominal diameter of the ball screw is smaller than that of the bow wheel, achieving the second stage of effort saving. It also includes a synchronous linkage mechanism, guide pulleys, and a protective cover to ensure launching stability. The launching method includes six standardized steps: projectile placement, gripping and fixing, two-stage effort-saving bow pulling and charging, synchronous calibration, projectile launching, and resetting. This invention offers significant two-stage effort saving, a simple structure, low cost, high launching stability and accuracy, and a standardized launching method that is suitable for outdoor recreation, competitive training, and other scenarios. The slingshot's core performance remains stable over a long period, resulting in a long service life.

Description

Technical Field

[0001] This invention relates to the field of composite bow technology, specifically to a two-stage, effort-saving slingshot and its launching method, which is particularly suitable for outdoor recreation, competitive training, and other scenarios. Background Technology

[0002] As a traditional and portable projectile device, the slingshot is widely used in outdoor recreation and competitive training due to its simple operation and high entertainment value. The core launching principle of the existing slingshot is as follows: when force is applied to the middle of the bowstring where the projectile is placed, the force is directly transmitted to the bowstring. The two ends of the bowstring are fixed to the bow arms on both sides of the bow body. The bow arms undergo elastic deformation under tension, accumulating elastic potential energy. After the bowstring is released, the elastic potential energy of the bow arms is rapidly released and propels the projectile through the bowstring.

[0003] However, existing slingshots and their practical methods have many technical defects in actual application: First, during the process of drawing the bow and charging the force, the elastic deformation of the bow arm increases continuously with the increase of the pulling force, and the elastic resistance increases positively correlated with the increase of the force required for charging in the later stage. This makes them unfriendly to users with weak strength, such as the elderly and teenagers, and makes them difficult to operate, making it impossible to guarantee the standardization of the launching action; Second, some existing labor-saving improved slingshots adopt a design that uses bow arm rotation in conjunction with additional potential energy storage components. Although this can reduce the difficulty of charging the force to a certain extent, the structure is complex, the manufacturing cost is high, and the potential energy storage components are prone to energy storage failure after long-term use. The decline in slingshot power leads to a decrease in core performance characteristics such as launch accuracy and launch distance, resulting in poor stability of the launch effect. Third, the bowstring and bow wheel of existing slingshots are mostly simple winding connections, which can easily cause bowstring deviation and jamming during the drawing process. This not only affects the effort-saving effect but also accelerates bowstring wear, shortens the slingshot's service life, and causes deviation in launch direction, reducing launch accuracy. Fourth, there are no standardized launch methods for existing slingshots. Users operate based on experience, which can easily lead to problems such as uneven draw force, deviation in force direction, and improper release timing, further reducing launch accuracy and failing to fully utilize the slingshot's performance.

[0004] To address the aforementioned technical problems, the development of a slingshot structure that combines two-stage effort-saving, simple structure, and stable launch, along with a standardized launch method, is urgently needed in this field. This will solve the technical pain points of existing slingshots, such as the difficulty in charging power, complex structure, easy performance degradation, and non-standard launch methods. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a two-stage effort-saving slingshot and its launching method. Through structural innovation, a two-stage effort-saving effect is achieved, simplifying the overall structure and improving launching stability and accuracy. At the same time, a standardized launching method is provided to standardize the operation process and solve the technical problems of existing slingshots, such as arduous power accumulation, complex structure, easy performance decay, and non-standard launching methods.

[0006] To achieve the above objectives, one of the present invention provides the following technical solution:

[0007] A two-stage, effort-saving slingshot includes a bow body and a drive mechanism. The drive mechanism includes a left bow wheel assembly and a right bow wheel assembly symmetrically arranged on the left and right sides of the bow body. The bow body includes a bow head and a left support arm and a right support arm integrally formed with the bow head. The left support arm is detachably connected to the left bow arm on the outside, and the right support arm is detachably connected to the right bow arm on the outside.

[0008] The left bow wheel assembly includes a left bow wheel and a left-handed ball screw coaxially fixed to the left bow wheel. The left bow wheel has a left-handed threaded groove adapted to the left bowstring. The right bow wheel assembly includes a right bow wheel and a right-handed ball screw coaxially fixed to the right bow wheel. The right bow wheel has a right-handed threaded groove adapted to the right bowstring. The tail ends of both the left-handed and right-handed threaded grooves are provided with at least one large-diameter spiral groove. The direction of rotation of the large-diameter spiral groove is consistent with the direction of rotation of the threaded groove of the bow wheel, and the nominal diameter of the large-diameter spiral groove is larger than the nominal diameter of the threaded groove of the bow wheel, thereby achieving the first stage of labor saving.

[0009] Both the left and right support arms are provided with nut fixing cavities. Nuts adapted to ball screws are fixedly connected in the nut fixing cavities. The left-hand ball screw and the right-hand ball screw are respectively screwed into the corresponding nuts. The nominal diameter of the left-hand ball screw is smaller than the nominal diameter of the left bow wheel, and the nominal diameter of the right-hand ball screw is smaller than the nominal diameter of the right bow wheel, thus achieving the second level of labor saving.

[0010] One end of the left bowstring passes through the left bow arm and is fixedly connected to the left support arm, while the other end is fixedly connected to one end of the right bowstring. The other end of the right bowstring passes through the right bow arm and is fixedly connected to the right support arm. A projectile frame is fixedly connected at the connection between the left and right bowstrings.

[0011] Furthermore, the left and right bow wheels can adopt a stepped shaft structure or a conical shaft structure. The bow wheel with a stepped shaft structure includes a coaxial small shaft section and a large shaft section. The small shaft section has a threaded groove, and the large shaft section has a large-diameter spiral groove. The bow wheel with a conical shaft structure has a threaded groove at the small end and a large-diameter spiral groove at the large end. Both structures can achieve stable guidance of the bowstring, avoid bowstring deviation and slippage during the drawing process, and ensure the stable performance of the dual-stage labor-saving effect.

[0012] Furthermore, the pitches of the left-hand ball screw, right-hand ball screw, left-hand thread groove, and right-hand thread groove are all equal, and the nominal diameters of the left-hand and right-hand ball screws are the same, as are the nominal diameters of the left-hand and right-hand thread grooves. This design ensures that the axial movement distance of the ball screw perfectly matches the movement distance of the bowstring within the thread groove during the drawing process, achieving precise compensation of the bowstring position, ensuring consistency in the user's force application position, and improving operational comfort and launching accuracy.

[0013] Furthermore, the present invention also includes a synchronous linkage mechanism, comprising synchronous rings respectively fixed to the end faces of the left and right bow wheels, with polyurethane elastic synchronous rings sleeved on the outer circumference of the synchronous rings, and the two elastic synchronous rings being arranged in relative contact. When the forces on both sides are uneven during the drawing of the bow, the elastic synchronous rings contact each other and generate elastic resistance, correcting the speed difference between the two bow wheels, realizing the synchronous rotation of the left and right bow wheel assemblies, avoiding the problem of offset and jamming caused by excessive force on one side of the bowstring, ensuring the uniform performance of the dual-stage force-saving effect, and improving the launching stability of the slingshot.

[0014] Alternatively, the synchronous linkage mechanism of the present invention includes a synchronous ring fixedly connected to the end faces of the left and right bow wheels respectively. The outer circumferential surface of the synchronous ring is fitted with engaging teeth. The two engaging teeth are meshed together. When the left and right bow wheels are subjected to uneven or asynchronous forces, the two engaging teeth restrict and forcefully synchronize the mechanism, thereby ensuring that the left and right bow arms are subjected to forces and deform synchronously, maintaining the stability of the launch direction, and improving the hit rate.

[0015] Furthermore, a protective cover is detachably connected to the opening of the nut fixing cavity via an internal hexagon screw. The protective cover has a nut limiting cavity on the side facing the nut, and the nut is locked in the nut limiting cavity with an interference fit. The protective cover can effectively limit the nut, preventing the nut from loosening during the rotation of the ball screw, while preventing external dust and debris from entering the nut fixing cavity, ensuring the engagement accuracy of the ball screw and the nut, reducing mechanical wear, and extending the service life of the slingshot.

[0016] Furthermore, a connecting beam is fixedly connected between the ends of the left and right support arms furthest from the bow head. A handle is integrally formed in the middle of the connecting beam, and an anti-slip rubber sleeve with an arc-shaped anti-slip texture is fitted on the outer periphery of the handle. The connecting beam can enhance the overall structural strength of the bow body, prevent the support arms from deforming under force, and ensure the stability of the slingshot structure. The anti-slip rubber sleeve can increase the friction between the palm and the handle, improve the stability of the grip, avoid the problem of hand slippage during the drawing and launching of the bow, and ensure the standardization of operation.

[0017] Furthermore, the ends of both the left and right bow arms furthest from the bow head are rotatably connected to guide pulleys with bowstring guide grooves. The left bowstring, after being wound around the left-hand threaded groove of the left bow wheel, is guided by a left-hand ball screw and wound around the guide pulley, finally being fixedly connected to the fixed post on the left support arm; the right bowstring adopts the same winding method. The guide pulley can change the force direction of the bowstring, reducing the frictional loss between the bowstring and the bow arm. At the same time, the bowstring guide groove can limit the bowstring and prevent it from slipping off. The anti-slip baffle at the top of the fixed post, together with the locking buckle, can achieve a firm fixation of the bowstring, preventing the bowstring from loosening during the drawing process and ensuring the stable transmission of the dual-stage labor-saving effect.

[0018] Furthermore, all metal parts of the slingshot are made of aluminum alloy, which combines structural strength and lightweight advantages, making it easy to carry and operate; the bowstring is made of high-strength nylon, which has excellent wear resistance and tensile strength, and can withstand the pulling force of repeated bowing; the guide pulley is made of POM engineering plastic, which has a low coefficient of friction, which can further reduce the wear of the bowstring and extend its service life.

[0019] The second aspect of this invention provides the following technical solution:

[0020] The launching method based on the above-mentioned two-stage, effort-saving slingshot includes the following steps:

[0021] S1. Projectile placement: Insert the projectile into the matching slot of the slingshot projectile frame to keep the projectile and the projectile frame relatively fixed, preventing the projectile from slipping or shifting during the drawing of the bow;

[0022] S2. Grip and hold: The user holds the slingshot handle with one hand, so that the non-slip rubber sleeve of the handle fits tightly against the palm, and the fingers naturally grip the handle, ensuring that the slingshot remains stable without deviation or shaking, laying the foundation for subsequent drawing, charging and launching operations.

[0023] S3, Dual-stage Effort-Saving Bow Pulling and Power Accumulation: The user pulls the projectile frame at a constant speed away from the bow head with their other hand. The left and right bow strings are pulled simultaneously, driving the left and right bow wheels to rotate respectively. The left and right ball screws, which are coaxially fixed to the bow wheels, rotate synchronously with the bow wheels and move axially under the action of the nut. The bow string first moves smoothly in the threaded groove of the bow wheel. When it moves to the end of the threaded groove, it naturally enters the large-diameter spiral groove. The lever arm amplification effect of the large-diameter spiral groove is used to achieve the first stage of effort saving. At the same time, the smaller nominal diameter ball screw is used to decompose the force, completing the second stage of effort saving. The bow arm undergoes elastic deformation under the uniform tension of the bow string and slowly accumulates elastic potential energy until the preset power accumulation position is reached.

[0024] S4. Synchronous calibration: During the bow-drawing and power-accumulating process, if the bowstrings on the left and right sides are subjected to uneven force due to force deviation, the two elastic synchronous rings of the synchronous linkage mechanism quickly come into contact with each other and generate elastic resistance, correcting the speed difference between the left and right bow wheels in real time, ensuring that the bow wheel assemblies on both sides rotate synchronously and at a uniform speed, avoiding bowstring deviation and jamming, and ensuring the uniform performance of the dual-stage force-saving effect.

[0025] S5, Projectile Ejection: After the user maintains a momentary stabilization at the preset power-charging position, the projectile frame is quickly released. The elastic potential energy of the bow arm is released quickly and completely, and the elastic reaction force is evenly transmitted to the projectile through the bowstring, propelling the projectile out of the projectile frame at high speed and smoothly in the preset direction.

[0026] S6. Reset: After the ejection is completed, the elastic deformation of the bow arm recovers quickly under its own elasticity, driving the bowstring, bow wheel assembly and ball screw to reset in the opposite direction along the original path, returning to the initial state, completing one complete ejection operation. The above steps can be repeated for continuous ejection.

[0027] The beneficial effects of this invention are as follows:

[0028] The dual-stage force-saving principle of this invention is as follows: According to the torque formula M=F×L (M is torque, F is force, and L is lever arm), during the bow-drawing and force-accumulating process, the deformation torque of the bow arm remains constant. When the bowstring enters the large-diameter spiral groove from the threaded groove, the lever arm L is enlarged due to the increase in the nominal diameter of the spiral groove, and the required pulling force F is correspondingly reduced, thus achieving the first stage of force saving. At the same time, the ball screw is coaxially fixed to the bow wheel. When the rotational torque of the bow wheel is transmitted to the ball screw with a smaller nominal diameter, the force is decomposed again, and the pulling force F is further reduced, thus achieving the second stage of force saving. The dual force-saving structure significantly reduces the force required for bow-drawing and force-accumulating.

[0029] Specifically, it has the following effects:

[0030] 1. The first stage of effort saving is achieved by amplifying the lever arm through the large-diameter spiral groove, and the second stage of effort saving is achieved by decomposing the force through the small nominal diameter ball screw. The dual effort-saving structure greatly reduces the force required to draw the bow and store power, making it user-friendly for users of different strengths (elderly, teenagers, and adults). It is easy to operate and can ensure the standardization of the launching action.

[0031] 2. The additional potential energy storage component added in the existing improvement scheme is abandoned. The two-stage labor saving is achieved through the cooperation of the bow wheel assembly and the ball screw. The overall structure is simple, the processing and manufacturing difficulty is low, the production cost is controllable, and there is no problem of energy storage component attenuation. The core performance of the slingshot is stable for a long time and the service life is long.

[0032] 3. By matching the pitch and nominal diameter, the bowstring position is accurately compensated, ensuring the consistency of the force application position; the synchronous linkage mechanism can correct the speed difference between the two bow wheels in real time, avoiding excessive force on one side of the bowstring; the cooperation between the guide pulley and the bowstring guide groove can prevent the bowstring from deviating or jamming. The multiple structural designs work together to improve the slingshot's launching stability and accuracy.

[0033] 4. A standardized ejection method from projectile placement to repositioning has been designed, which standardizes key operating steps such as draw force, direction of force application, and release timing. Users can quickly master the standardized operating method, avoid ejection deviations caused by lack of experience, and give full play to the slingshot's dual-stage labor-saving and ejection performance.

[0034] 5. The connecting beam enhances the overall structural strength of the bow and prevents the support arm from deforming under stress; the anti-slip rubber sleeve on the grip increases grip friction, improves grip stability and comfort, and avoids hand slippage; the detachable bow arm, protective cover and other structural designs facilitate later maintenance and replacement, improving the ease of use of the slingshot. Attached Figure Description

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0036] Figure 1 This is a first-view schematic diagram of this embodiment;

[0037] Figure 2 This is a schematic diagram of the second perspective in this embodiment;

[0038] Figure 3 This is a third-view diagram of this embodiment;

[0039] Figure 4 A three-dimensional schematic diagram of the drive mechanism;

[0040] Figure 5 This is the main view of the drive mechanism;

[0041] Figure 6 This is a 3D schematic diagram of the left bow wheel assembly;

[0042] Figure 7 This is a 3D schematic diagram of the right bow wheel assembly.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1-Left bow wheel assembly; 2-Right bow wheel assembly; 3-Left bow wheel; 4-Left-hand ball screw; 5-Left-hand threaded groove; 6-Left bowstring; 7-Nut; 8-Right bow wheel; 9-Right-hand ball screw; 10-Right-hand threaded groove; 11-Right bowstring; 12-Shot frame; 13-Large diameter spiral groove; 14-Synchronizing ring; 15-Elastic synchronizing ring; 16-Shot; 17-Bow body; 18-Bow head; 19-Left support arm; 20-Right support arm; 21-Connecting beam; 22-Grip; 23-Left bow arm; 24-Right bow arm; 25-Pulley; 26-Fixing column; 27-Guide wheel; 28-Drive mechanism; 29-Protective cover; 30-Anti-slip rubber sleeve; 31-Nut fixing cavity.

[0045] Note: The accompanying drawings are for illustrative purposes only and are not intended to limit the specific dimensions and proportions of the present invention. The part numbers correspond to the structure of the specific embodiment to facilitate understanding of the technical solution. Detailed Implementation

[0046] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0047] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0048] like Figure 1-7 As shown, this embodiment provides a two-stage, effort-saving slingshot, including a bow body 17 and a drive mechanism 28. The drive mechanism 28 includes a left bow wheel assembly 1 and a right bow wheel assembly 2 symmetrically arranged on the left and right sides of the bow body 17. The bow body 17 includes a bow head 18 and a left support arm 19 and a right support arm 20 integrally formed with the bow head 18. The left support arm 19 is detachably connected to the left bow arm 23 by bolts on its outer side, and the right support arm 20 is detachably connected to the right bow arm 24 by bolts on its outer side. The detachable bow arm design facilitates later replacement and maintenance, reducing the cost of use.

[0049] The left bow wheel assembly 1 includes a left bow wheel 3 and a left-handed ball screw 4 coaxially welded and fixed to the left bow wheel 3. The left bow wheel 3 has a left-handed threaded groove 5 adapted to the left bowstring 6. The right bow wheel assembly 2 includes a right bow wheel 8 and a right-handed ball screw 9 coaxially welded and fixed to the right bow wheel 8. The right bow wheel 8 has a right-handed threaded groove 10 adapted to the right bowstring 11. In this embodiment, both the left bow wheel 3 and the right bow wheel 8 adopt a stepped shaft structure, including a coaxial small shaft section and a large shaft section. The small shaft section has a threaded groove, and the large shaft section has a large-diameter spiral groove 13. The direction of rotation of the large-diameter spiral groove 13 is consistent with the direction of rotation of the threaded groove of the bow wheel, and the nominal diameter of the large-diameter spiral groove 13 is larger than that of the threaded groove. The first level of force saving is achieved by amplifying the lever arm. The nominal diameter of the left-handed ball screw 4 is smaller than that of the left bow wheel 3, and the nominal diameter of the right-handed ball screw 9 is larger than that of the right bow wheel 8. The second level of force saving is achieved by force decomposition.

[0050] Both the left support arm 19 and the right support arm 20 are provided with nut fixing cavities 31. Nuts 7 adapted to ball screws are fixedly connected in the nut fixing cavities. Left-hand ball screws 4 and right-hand ball screws 9 are respectively screwed into the corresponding nuts 7. A protective cover 29 is detachably connected to the opening of the nut fixing cavity by an internal hex screw. The protective cover 29 has a nut limiting cavity on the side facing the nut 7. The nut 7 is locked in the nut limiting cavity and is interference-fitted with the nut limiting cavity to effectively prevent the nut 7 from loosening and ensure the screwing accuracy.

[0051] One end of the left bowstring 6 passes through the left bow arm 23 and is fixedly connected to the left support arm 19. The other end is fixedly connected to one end of the right bowstring 11. The other end of the right bowstring 11 passes through the right bow arm 24 and is fixedly connected to the right support arm 20. The connection between the left bowstring 6 and the right bowstring 11 is fixedly connected to the projectile frame 12 by adhesive. The projectile frame 12 is made of plastic and has an arc-shaped groove on the inside to fit the projectile 16, preventing the projectile 16 from slipping during the drawing and launching of the bow.

[0052] In one possible embodiment, the pitch of the left-hand ball screw 4, the right-hand ball screw 9, the left-hand thread groove 5, and the right-hand thread groove 10 is all 5mm. The nominal thread diameter of the left-hand ball screw 4 and the right-hand ball screw 9 is 12mm, and the nominal thread diameter of the left-hand thread groove 5 and the right-hand thread groove 10 is 10mm, so as to achieve precise compensation of the bowstring position and ensure consistent force application.

[0053] This embodiment also includes a synchronous linkage mechanism, including a synchronous ring 14 welded and fixed to the end faces of the left bow wheel 3 and the right bow wheel 8 respectively. A polyurethane elastic synchronous ring 15 is sleeved on the outer circumferential surface of the synchronous ring 14. The elastic synchronous ring 15 is interference-fitted with the synchronous ring 14. The two elastic synchronous rings 15 are arranged opposite each other and are in contact with each other. When there is a speed difference or deviation, the speed difference of the bow wheels is corrected in real time by the contact friction force to ensure synchronous rotation.

[0054] Alternatively, as a variation, the synchronous linkage mechanism in this embodiment includes a synchronous ring fixed to the end faces of the left and right bow wheels respectively. The outer circumferential surface of the synchronous ring is fitted with engaging teeth. The two engaging teeth are meshed together. When the left and right bow wheels experience uneven or asynchronous force, the two engaging teeth restrict and forcefully synchronize the mechanism, thereby ensuring that the left and right bow arms are subjected to force and deformation synchronously, maintaining the stability of the ejection direction, and improving the hit rate.

[0055] A connecting beam 21 is welded and fixed between the ends of the left support arm 19 and the right support arm 20 away from the bow head 18. A handle 22 is integrally formed in the middle of the connecting beam 21. An anti-slip rubber sleeve 30 is fitted on the outer periphery of the handle 22. The outer periphery of the anti-slip rubber sleeve 30 is provided with an arc-shaped anti-slip texture to improve grip stability and comfort.

[0056] The ends of the left bow arm 23 and the right bow arm 24 furthest from the bow head 18 are both rotatably connected to guide pulleys 25 via pins. The outer circumferential surface of the guide pulleys 25 is provided with bowstring guide grooves. The left bowstring 6 is wound around the left-hand threaded groove 5 of the left bow wheel 3, guided by the left-hand ball screw 4 and wound around the guide pulley 25 of the left bow arm 23, and finally fixed to the fixed post 26 on the left support arm 19. The right bowstring 11 adopts the same winding method. The fixed post 26 is integrally formed with the support arm. The top of the fixed post 26 is welded and fixed with an anti-detachment baffle. The diameter of the anti-detachment baffle is twice the nominal diameter of the fixed post 26. After the bowstring is wound around the fixed post 26, it is locked and fixed by a stainless steel locking buckle to prevent the bowstring from loosening.

[0057] In this embodiment, guide wheels 27 are provided on the left support arm 19 and the right support arm 20 to guide the bowstring, which makes it easier to guide the bowstring to the left bow arm 23 or the right bow arm 24, thereby reducing the difficulty of traction.

[0058] All metal parts of the slingshot in this embodiment are made of 6061 aluminum alloy and are anodized, which combines high strength, lightweight and corrosion resistance; the bowstring is made of high-strength nylon braided material with tensile strength ≥500N and excellent wear resistance; the guide pulley is made of POM engineering plastic material with a friction coefficient ≤0.1, which can reduce bowstring wear.

[0059] The launching method based on the above-mentioned two-stage, effort-saving slingshot includes the following steps:

[0060] S1. Projectile placement: Insert the projectile 16 into the arc-shaped slot of the projectile frame 12, so that the projectile 16 and the projectile frame 12 fit tightly and remain relatively fixed.

[0061] S2. Grip and fixation: The user holds the handle 22 with one hand, with the palm and the anti-slip rubber sleeve 30 in close contact, and the fingers naturally hook into the arc-shaped anti-slip texture of the handle 22, so that the slingshot as a whole remains horizontal and stable, without deviation or shaking.

[0062] S3, Dual-stage effort-saving bow pulling and power storage: The user pulls the projectile frame 12 at a constant speed away from the bow head 18 with the other hand. The left bowstring 6 and the right bowstring 11 are pulled simultaneously, driving the left bow wheel 3 and the right bow wheel 8 to rotate at a constant speed of 10r / min. The left-hand ball screw 4 and the right-hand ball screw 9 rotate synchronously with the bow wheels and move along the axial direction. The bowstring first moves smoothly in the thread groove, and after moving to the end of the thread groove, it naturally enters the large-diameter spiral groove 13, realizing the first stage of effort saving. At the same time, the force decomposition of the ball screw realizes the second stage of effort saving. The bow arm undergoes elastic deformation slowly under tension until the projectile frame 12 moves to the preset power storage position 1830cm away from the bow head, completing the power storage.

[0063] S4. Synchronous calibration: During the bow drawing and power accumulation process, if the force applied is unevenly distributed on both sides of the bowstring due to force deviation, the two elastic synchronization rings 15 will quickly contact each other and generate elastic resistance to correct the speed difference between the left and right bow wheels in real time, ensuring that the bow wheel assemblies on both sides rotate synchronously and avoiding bowstring deviation and jamming.

[0064] S5, Projectile Ejection: After the user maintains stability in the preset charging position, he / she quickly releases the projectile frame 12. The elastic potential energy of the bow arm is released quickly, and the elastic reaction force is transmitted to the projectile 16 through the bowstring, propelling the projectile 16 to be ejected at a speed of ≥30m / s in the horizontal direction at high speed.

[0065] S6. Reset: After the ejection is completed, the elastic deformation of the bow arm recovers quickly under its own elasticity, driving the bowstring, bow wheel assembly and ball screw to reset in the opposite direction along the original path, returning to the initial state, completing one complete ejection operation. The above steps can be repeated for continuous ejection.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A two-stage, effort-saving slingshot, comprising a bow body and a drive mechanism, characterized in that, The drive mechanism includes a left bow wheel assembly and a right bow wheel assembly symmetrically arranged on the left and right sides of the bow body. The bow body includes a bow head and a left support arm and a right support arm integrally formed with the bow head. The left support arm is detachably connected to the left bow arm on the outside, and the right support arm is detachably connected to the right bow arm on the outside. The left bow wheel assembly includes a left bow wheel and a left-handed ball screw coaxially fixed to the left bow wheel. The left bow wheel has a left-handed threaded groove adapted to the left bowstring. The right bow wheel assembly includes a right bow wheel and a right-handed ball screw coaxially fixed to the right bow wheel. The right bow wheel has a right-handed threaded groove adapted to the right bowstring. The tail ends of both the left-handed and right-handed threaded grooves are provided with at least one large-diameter spiral groove. The direction of rotation of the large-diameter spiral groove is consistent with the direction of rotation of the threaded groove of the bow wheel, and the nominal diameter of the large-diameter spiral groove is larger than the nominal diameter of the threaded groove of the bow wheel, thereby achieving the first stage of labor saving. Both the left and right support arms are provided with nut fixing cavities. Nuts adapted to ball screws are fixedly connected in the nut fixing cavities. The left-hand ball screw and the right-hand ball screw are respectively screwed into the corresponding nuts. The nominal diameter of the left-hand ball screw is smaller than the nominal diameter of the left bow wheel, and the nominal diameter of the right-hand ball screw is smaller than the nominal diameter of the right bow wheel, thus achieving the second level of labor saving. One end of the left bowstring passes through the left bow arm and is fixedly connected to the left support arm, while the other end is fixedly connected to one end of the right bowstring. The other end of the right bowstring passes through the right bow arm and is fixedly connected to the right support arm. A projectile frame is fixedly connected at the connection between the left and right bowstrings.

2. The two-stage, effort-saving slingshot according to claim 1, characterized in that, Both the left and right bow wheels have stepped shaft structures. The stepped shaft includes a coaxial small shaft section and a large shaft section. The small shaft section has the threaded groove, and the large shaft section has the large-diameter spiral groove. The nominal diameter of the large shaft section is matched with the nominal diameter of the large-diameter spiral groove.

3. A two-stage, effort-saving slingshot according to claim 1, characterized in that, Both the left and right bow wheels are conical shaft structures. The small end of the conical shaft is provided with the threaded groove, and the large end of the conical shaft is provided with the large-diameter spiral groove. The nominal diameter of the large end of the conical shaft is matched with the nominal diameter of the large-diameter spiral groove.

4. A two-stage, effort-saving slingshot according to claim 1, characterized in that, The left-hand ball screw, right-hand ball screw, left-hand thread groove, and right-hand thread groove all have the same pitch. The nominal diameter of the left-hand ball screw and the right-hand ball screw are the same, and the nominal diameter of the left-hand thread groove and the right-hand thread groove are the same.

5. A two-stage, effort-saving slingshot according to claim 1, characterized in that, It also includes a synchronous linkage mechanism, which includes a synchronous ring fixedly connected to the end faces of the left and right bow wheels respectively. The outer circumferential surface of the synchronous ring is fitted with an elastic synchronous ring or a locking tooth. The two elastic synchronous rings are arranged in relative contact, and the two locking teeth are engaged.

6. A two-stage, effort-saving slingshot according to claim 5, characterized in that, The elastic synchronizing ring is a polyurethane elastic ring, and the inner circumferential surface of the elastic synchronizing ring is interference-fitted with the outer circumferential surface of the synchronizing ring. The outer circumferential surface of the elastic synchronizing ring is a smooth arc surface.

7. A two-stage, effort-saving slingshot according to claim 1, characterized in that, A protective cover is detachably connected to the opening of the nut fixing cavity. The protective cover is fixed to the support arm by an internal hexagon screw. A nut limiting cavity is opened on the side of the protective cover facing the nut. The nut is locked in the nut limiting cavity and is interference-fitted with the nut limiting cavity.

8. A two-stage, effort-saving slingshot according to claim 1, characterized in that, A connecting beam is fixedly connected between the ends of the left and right support arms away from the bow head. A handle is integrally formed in the middle of the connecting beam. An anti-slip rubber sleeve is fitted on the outer periphery of the handle, and an arc-shaped anti-slip texture is formed on the outer periphery of the anti-slip rubber sleeve.

9. A two-stage, effort-saving slingshot according to claim 1, characterized in that, The left and right bow arms are each rotatably connected to a guide pulley at the end furthest from the bow head. The outer circumference of the guide pulley is provided with a bowstring guide groove. The left bowstring is wound around the left-hand threaded groove of the left bow wheel, guided by a left-hand ball screw and wound around the guide pulley of the left bow arm, and finally fixed to the fixed post on the left support arm. The right bowstring is wound around the right-hand threaded groove of the right bow wheel, guided by a right-hand ball screw and wound around the guide pulley of the right bow arm, and finally fixed to the fixed post on the right support arm.

10. A launching method based on the two-stage force-saving slingshot according to any one of claims 1-10, characterized in that, Includes the following steps: S1. Projectile placement: Insert the projectile into the matching slot of the slingshot projectile frame to keep the projectile and the projectile frame relatively fixed. S2. Secure grip: The user holds the slingshot handle with one hand, ensuring that the non-slip rubber sleeve of the handle fits snugly against the palm, thus keeping the slingshot stable without shifting or wobbling. S3, Dual-stage Effort-Saving Bow Pulling and Power Accumulation: The user pulls the projectile frame away from the bow head with their other hand. The left and right bowstrings are pulled simultaneously, driving the left and right bow wheels to rotate respectively. The left and right ball screws, which are coaxially fixed to the bow wheels, rotate synchronously with the bow wheels and move axially under the action of the nut. The bowstring first moves in the threaded groove of the bow wheel. When it moves to the end of the threaded groove, it enters the large-diameter spiral groove. The lever arm of the large-diameter spiral groove is amplified to achieve the first stage of effort saving. At the same time, the smaller nominal diameter ball screw is used to decompose the force to complete the second stage of effort saving. The bow arm undergoes elastic deformation under the tension of the bowstring and accumulates elastic potential energy. S4. Synchronous calibration: During the bow drawing and power storage process, if the bowstrings on the left and right sides are not subjected to uneven force, the two elastic synchronous rings of the synchronous linkage mechanism will contact each other and generate elastic resistance to correct the speed difference between the left and right bow wheels, ensure that the bow wheel assemblies on both sides rotate synchronously, and avoid bowstring deviation and jamming. S5, Projectile Ejection: The user releases the projectile frame, the elastic potential energy of the bow arm is released rapidly, and the elastic reaction force is transmitted to the projectile through the bowstring, propelling the projectile out of the projectile frame at high speed in a preset direction; S6. Reset: After the ejection is completed, the elastic deformation of the bow arm is restored, which drives the bowstring, bow wheel assembly and ball screw to reset, completing a complete ejection operation.

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