Middle shaft crank structure for interconversion of scooter and bicycle

Abstract

The utility model discloses a centre shaft crank structure for interconversion between a scooter and a bicycle, which comprises a shaft barrel, a driving shaft, a left crank mechanism, a right crank mechanism and a foot support, anti-skidding lines can be arranged outside the foot support, and screw holes are arranged at two ends of the driving shaft. The left crank mechanism and the right crank mechanism are fixed to the left end and the right end of the driving shaft through bolts respectively to form a bicycle mode, the foot support replaces the left crank mechanism and the right crank mechanism through the same bolt connector to form a scooter mode, and a chain plate is fixed to the position, on the outer side of a shaft barrel, of the right end of the driving shaft. Through innovative modular design, a precise positioning structure and user-friendly operation optimization, the child riding device comprehensively exceeds traditional child riding equipment in functionality, safety, economical efficiency and durability, the actual pain point of parents is solved, and meanwhile safer and more flexible learning and riding experience is provided for children.

Description

TECHNICAL FIELD

[0001] The utility model relates to a middle shaft crank structure for mutual conversion of scooter and bicycle. BACKGROUND

[0002] At present, balance car and children's bicycle are two kinds of vehicles that many parents buy for children, the balance car is a two-wheeled vehicle, which has the characteristics of no auxiliary wheel, no pedal, no crank and low saddle, and the balance car enables children to master the balance of the two-wheeled vehicle in a very short time by sliding on the ground. Many parents will buy a balance car for children to master the balance of the two-wheeled vehicle before learning to ride a bicycle, thereby greatly improving the efficiency of learning to ride a bicycle later.

[0003] In order to save expenses, some parents will remove the auxiliary wheel of the children's bicycle to enable children to learn the balance of the two-wheeled vehicle, but this method has the following problems: after the auxiliary wheel of the children's bicycle is removed, the pedal will greatly interfere with the children's pedaling posture, and the existing pedal part of the children's bicycle is troublesome to disassemble and assemble, which is not conducive to children's learning of balance riding. Even if the pedal is removed, children do not have a place to put their feet when learning to balance. SUMMARY

[0004] In view of the above problems, the utility model provides a middle shaft crank structure for mutual conversion of scooter and bicycle, which effectively solves the problems pointed out in the background art.

[0005] The technical scheme adopted by the utility model is:

[0006] A middle shaft crank structure for mutual conversion of scooter and bicycle, comprising a shaft cylinder, a driving shaft, a left crank mechanism, a right crank mechanism and a foot support, anti-skid lines can be provided outside the foot support, screw holes are formed at both ends of the driving shaft, the left crank mechanism and the right crank mechanism are fixed to the left and right ends of the driving shaft by bolts to form a bicycle mode, the foot support is replaced with the left crank mechanism and the right crank mechanism by the same bolt interface to form a scooter mode, and a chain disc is fixed to the outside of the shaft cylinder at the right end of the driving shaft.

[0007] Preferably, a through hole matched with the bolt is formed in the left crank mechanism, the right crank mechanism and the foot support, and a positioning groove matched with the end of the driving shaft is formed at one end of the through hole towards the driving shaft.

[0008] Preferably, the two end sides of the driving shaft are locked in the circumferential direction by the slope and the positioning groove.

[0009] Preferably, a rotating operation part is fixed to the outer end of the bolt.

[0010] As preferred, the right end of the driving shaft is provided with a positioning platform outside the shaft cylinder, the outer end side of the positioning platform is provided with an external thread, the shaft core of the chain disc is provided with a positioning hole matched with the positioning platform, the chain disc is fixed on the driving shaft through a nut matched with the external thread.

[0011] As preferred, the inner side of the rotating operation part is formed with a protective cover.

[0012] The utility model discloses a modular design, precise positioning structure and user-friendly operation optimization, and comprehensively surpasses traditional children's riding equipment in functionality, safety, economy and durability, solves the actual pain point of parents, and provides children with safer and more flexible learning and riding experience.

[0013] The utility model has the advantages of:

[0014] 1. Multifunctional integration and rapid conversion:

[0015] Dual-purpose design: through the modular replacement of left / right crank mechanism and foot support, the rapid switching of scooter and bicycle mode is realized, the traditional need of buying two vehicles is integrated into one, and the economic burden of parents is solved.

[0016] Conversion efficiency is improved: unified bolt interface and rotating operation part design are adopted, mode conversion can be completed by loosening the bolt and replacing the parts, professional tools are not needed throughout the operation, and the operation can be completed within 5 minutes.

[0017] 2. Operation convenience and user experience optimization:

[0018] Simplified disassembly and assembly process: the rotating operation part (such as hexagonal head or handle) is arranged at the outer end of the bolt, and the user can complete the disassembly and assembly by hand, avoiding the dependence on traditional screwdrivers or wrenches.

[0019] Anti-misassembly design: the positioning groove and the end part of the driving shaft are strictly matched in shape, ensuring that the foot support or crank can only be installed in the correct direction, reducing the risk of misoperation.

[0020] 3. Safety is significantly improved:

[0021] Foot support stability: in the scooter mode, the foot support provides a wide and anti-slip tread surface, avoiding the suspension or slipping of children's feet, and reducing the risk of falling caused by unstable center of gravity when pedaling.

[0022] Structure anti-loosening: the driving shaft side slope and the circumferential locking design of the positioning groove cooperate with the bolt fastening force, effectively preventing the rotation or loosening of the parts during riding, and ensuring the stable connection.

[0023] 4. Structure stability and durability are enhanced:

[0024] Chain disc transmission optimization: the chain disc is fixed by the positioning table and the external thread nut, avoiding the problem of easy wear of traditional key groove connection, improving transmission efficiency and reliability;

[0025] 5. Economic and environmental benefits:

[0026] Reducing the purchase cost: one vehicle meets the dual needs of scooter learning and bicycle riding, saving family expenses;

[0027] Reducing resource waste: avoiding frequent replacement of vehicles due to children's growth, in line with the concept of sustainable development;

[0028] 6. Maintenance and expansion advantages:

[0029] Easy maintenance design: modular components can be replaced independently, such as replacing the corresponding module when the single-sided crank is damaged, reducing maintenance costs;

[0030] Compatibility expansion: the same bolt interface can adapt to different sizes of foot supports or cranks, meeting the needs of children of different ages, and improving the product life cycle;

[0031] 7. The protective cover covers the inside of the rotating operation part, effectively blocking dust, sand and other foreign matter from entering the bolt and drive shaft interface, avoiding component wear or jam caused by pollutant accumulation, prolonging the service life, and hiding the bolt interface and other mechanical components through the protective cover, making the central shaft crank structure more simple and smooth in appearance, meeting the design requirements of children's products for aesthetics. In general, the protective cover has four functions of dust prevention, safety protection, structural stability and aesthetic optimization, improving the durability, safety and user experience of the utility model, fully embodying the design of humanization and practicality. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic view of the utility model as a bicycle;

[0033] Figure 2 is an exploded structural schematic view of Figure 1

[0034] Figure 3 is a structural schematic view of the utility model as a scooter;

[0035] Figure 4 is an exploded structural schematic view of Figure 3 DETAILED DESCRIPTION

[0036] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs. ​​

[0037] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0038] In addition, in the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, the terms "first", "second", "third", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0040] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them.

[0042] The utility model will be described further in detail below by specific embodiments in combination with drawings.

[0043] As Figures 1-4 The utility model discloses a middle shaft crank structure for the mutual conversion of scooter and bicycle, including shaft cylinder 1, drive shaft 2, left crank mechanism 3, right crank mechanism 4 and foot support 5, and the foot support can be provided with antiskid lines, drive shaft 2 is nested in shaft cylinder 1, and the specific installation mode between the both is conventional technical means, and the utility model will not be described in detail, the both ends of drive shaft 2 are provided with screw holes 6, left crank mechanism 3 and right crank mechanism 4 are fixed to the left and right two ends of drive shaft 2 through bolt 7 respectively to form bicycle mode, foot support 5 is replaced left crank mechanism 3 and right crank mechanism 4 through the same bolt interface to form scooter mode, and the right end of drive shaft 2 is fixed with chain disc 8 on the outside of shaft cylinder 1.

[0044] The left crank mechanism 3, right crank mechanism 4 and foot support 5 are provided with through hole 17 matched with bolt 7, and the through hole 17 is provided with positioning groove 9 matched with the end of drive shaft 2 at one end towards drive shaft 2.

[0045] The both end sides of drive shaft 2 are locked in the circumferential direction with positioning groove 9 through inclined plane 10.

[0046] The outer end of bolt 7 is fixed with rotary operation part 11.

[0047] The right end of drive shaft 2 is provided with positioning table 12 on the outside of shaft cylinder 1, the outer end side of positioning table 12 is provided with external thread 13, the shaft core of chain disc 8 is provided with positioning hole 14 matched with positioning table 12, chain disc 8 is fixed on drive shaft 2 through nut 15, and nut 15 is matched with external thread 13.

[0048] The inner side of rotary operation part 11 forms protective cover 16.

[0049] The utility model discloses middle shaft crank structure through modular design and precision positioning mechanism, realizes the efficient conversion of scooter and bicycle mode, and the specific working principle is as follows:

[0050] 1. Bicycle mode (pedal-driven):

[0051] Component installation:

[0052] Fix the left crank mechanism 3 and the right crank mechanism 4 to the ends of the drive shaft 2 through the bolts 7. Fix the chain disc 8 to the right end of the drive shaft 2 through the positioning table 12 and the external thread 13 nut 15 to form a complete transmission system.

[0053] Power transmission:

[0054] When the child pedals the crank, the drive shaft 2 drives the chain disc 8 to rotate, and the power is transmitted to the rear wheel through the chain to realize the riding function of the bicycle.

[0055] Anti-loose design:

[0056] Circumferential locking: The bevels at both ends of the drive shaft 2 cooperate with the positioning grooves 9 of the crank mechanisms to limit the circumferential rotation of the components.

[0057] Bolt fastening: After the rotating operation part 11 (such as the handle) at the outer end of the bolt 7 is tightened by hand, it is locked with the bevel 10 to ensure that the crank does not loosen during riding.

[0058] 2. Scooter mode (sliding on the ground):

[0059] Component replacement:

[0060] Remove the left crank mechanism 3 and the right crank mechanism 4, and install the footrest 5 through the same bolt interface. The positioning grooves 9 of the footrest 5 match the end parts of the drive shaft 2 to ensure the correct installation direction.

[0061] Function realization:

[0062] The footrest 5 provides a wide and textured tread surface, and the child's feet can be naturally placed on the footrest 5 to maintain balance by sliding on the ground.

[0063] Stability guarantee:

[0064] Anti-slip design: The textured surface of the footrest 5 reduces the risk of slipping.

[0065] Structural stability: The bevel 10 of the drive shaft 2 cooperates with the positioning grooves 9 of the footrest 5, combined with the fastening of the bolt 7, to prevent the footrest 5 from deviating during sliding.

[0066] 3. Mode conversion process:

[0067] Remove the crank: loosen the bolt 7 through the rotating operation part 11, and remove the left crank mechanism 3 and the right crank mechanism 4.

[0068] Install the footrest: align the footrest 5 with the positioning grooves 9 at the end of the drive shaft 2, and then insert and tighten the bolt 7.

[0069] Chain disc adaptation: In the scooter mode, the chain disc 8 is fixed by the positioning table 12 and the nut 15 without disassembly, avoiding interference with the transmission system.

[0070] Time-consuming: No tools are needed throughout the conversion, and the conversion is completed quickly.

[0071] 4. Core design synergy:

[0072] Modular interface: Unified bolt interface for quick component replacement, reducing operation complexity;

[0073] Positioning and locking: The positioning groove 9 strictly matches the shape of the end of the drive shaft 2 to prevent misinstallation; the bevel 10 of the drive shaft 2 is circumferentially locked with the component to enhance the anti-torsion capability;

[0074] Chain disc fixing optimization: The positioning table 12 and the outer thread 13 nut 15 double-fix the chain disc 8 to avoid traditional keyway wear and improve transmission reliability.

[0075] 5. Safety and durability:

[0076] Anti-misoperation: The component can only be installed in the correct direction, reducing the risk of installation errors;

[0077] Anti-loosening mechanism: Bevel 10 locking and bolt 7 tightening double protection to ensure the structure is stable during riding;

[0078] Easy maintenance: Modular components can be replaced independently (such as single-sided crank or foot support damage), reducing maintenance costs.

[0079] Finally, it should be noted that the above is only a specific embodiment of the present application. Obviously, the present application is not limited to the above embodiments, and there can be many variations. All variations that can be directly derived or inferred from the content disclosed in the present application by those of ordinary skill in the art should be considered as falling within the scope of protection of the present application.

Claims

1. A middle axle crank structure for converting a scooter into a bicycle and vice versa, characterized in that, The utility model relates to a kind of self-propelled vehicle, including axle cylinder (1), drive shaft (2), left crank mechanism (3), right crank mechanism (4) and foot support (5), the screw hole (6) of both ends of the drive shaft (2) is set, the left crank mechanism (3) and right crank mechanism (4) are respectively fixed to the left and right ends of drive shaft (2) by bolt (7) and form bicycle mode, the foot support (5) is replaced left crank mechanism (3) and right crank mechanism (4) by same bolt interface and forms scooter mode, the right end of the drive shaft (2) is fixed with chain disc (8) outside axle cylinder (1).

2. The axle crank structure for converting a scooter into a bicycle according to claim 1, wherein The left crank mechanism (3), right crank mechanism (4) and foot support (5) are provided with through holes (17) matched with the bolt (7), and the through holes (17) are provided with positioning grooves (9) matched with the end of the drive shaft (2) at the end towards the drive shaft (2).

3. The axle crank structure for converting a scooter into a bicycle according to claim 2, wherein The both ends of the drive shaft (2) are circumferentially locked with the positioning grooves (9) through bevels (10).

4. The axle crank structure for converting a scooter into a bicycle according to claim 3, wherein The outer end of the bolt (7) is fixed with a rotating operation part (11).

5. The axle crank structure for converting a scooter into a bicycle according to claim 4, wherein The right end of the drive shaft (2) is provided with a positioning table (12) outside the axle cylinder (1), the outer end of the positioning table (12) is provided with an external thread (13), the shaft core of the chain disc (8) is provided with a positioning hole (14) matched with the positioning table (12), the chain disc (8) is fixed on the drive shaft (2) through a nut (15), and the nut (15) is matched with the external thread (13).

6. The axle crank structure for converting a scooter into a bicycle according to claim 4, wherein The inner side of the rotating operation part (11) forms a protective cover (16).

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