Rear fork folding mechanism and buggy

Abstract

The utility model relates to a rear fork folding mechanism and a buggy, and aims to solve the technical problems that the existing similar product is difficult to be used for a three-wheel buggy with double rear wheels, and is poor in stability, inconvenient to operate and inconvenient to package and transport. An adjusting device of the mechanism comprises a control unit, the upper end of an adjusting device main body is connected with a positioning piece, and an adjusting device button integrally connected with the lower end of the adjusting device main body penetrates through a guide groove; according to the structural design key points, a main body of the adjusting device is a rotary fixing main body, the rotary fixing main body is arranged on the lower side of a main beam pipe on one side of a rear wheel assembly, and one end of a rear fork bent pipe is fixed to pipe locking grooves in one ends of fixing plates on the two sides through symmetrically-arranged rear fork fixing screws respectively; the other ends of the fixing plates on the two sides of the rotary fixing body are fixed to one end of the rotating hole of the rotary fixing body through a pair of locking screws and connected into a whole, and the fixing plates on the two sides of the outer side of the other end of the rotary fixing body are connected into a whole through another pair of locking screws.

Description

Technical Field

[0001] The utility model belongs to the field of children's bicycles and relates to a rear fork folding mechanism and a children's bicycle. Background Art

[0002] Children's bicycles refer to non-powered vehicles used for children's travel, including five categories: children's bicycles, strollers, baby walkers, children's tricycles, and children's electric vehicles. Children's bicycles are generally suitable for children aged 4-8 years old. When purchasing, choose the appropriate size based on the child's age and height, that is, the saddle height is within the range of 435-635mm. When purchasing a vehicle, pay attention to the size of the handbrake handle. Although there are many types of children's bicycles on the market, they have a single function and cannot be folded, resulting in excessive packaging size and high transportation costs. Some of these children's bicycles use a folding structure on the vehicle to facilitate the height adjustment of the saddle, such as the application number 202220370422.8 disclosed in the Chinese patent document, the authorization announcement date is 2022.07.05, and the utility model name is "a seat adjustment mechanism and a children's bicycle"; but the seat adjustment mechanism of the above-mentioned product is difficult to be directly used on the rear fork folding mechanism of the children's bicycle. It has a gear adjustment function and is difficult to be used for the folding, retracting and opening of the rear fork. In addition, similar products lack the rear fork adjustment and folding mechanism design, and are difficult to use for three-wheeled children's bicycles with two rear wheels; such as the application number 201810028962.6 disclosed in the Chinese patent literature, the application publication date 2018.06.05, and the invention name "A folding frame structure for children's bicycles"; but the above-mentioned product structure design is relatively simple, the stability is poor, and the operation is relatively inconvenient. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide a rear fork folding mechanism in the art, so as to solve the technical problems that the existing similar products lack the rear fork adjustment and folding mechanism design, especially are difficult to use for three-wheeled children's bicycles with two rear wheels, have poor stability, are inconvenient to operate, and are inconvenient to pack and transport. The purpose is achieved through the following technical solutions.

[0004] A rear fork folding mechanism, the adjustment device of the mechanism includes a control unit, the control unit includes an adjustment device body, a return spring, an adjustment device button and a positioning piece, a guide groove is provided in the cavity of the adjustment device, one end of the return spring abuts against the inner wall of the guide groove and the other end abuts against the adjustment device body; the adjustment device body is arranged on the guide groove, the upper end of the adjustment device body is connected to the positioning piece and the lower end is connected as an integral adjustment device button and passes through the guide groove, and the adjustment device body slides on the guide groove. The key points of its structural design are that the main body of the adjustment device is a rotating fixed body, which is arranged at the lower side of the main beam tube on one side of the rear wheel assembly, the main beam tube is provided with a seat cushion, and the two sides of the rotating fixed body are symmetrically provided with fixed plates, and one end of the U-shaped section of the rear fork bent tube or one end of the rear fork tube is respectively fixed to the locking tube groove at one end of the two fixing plates through symmetrically arranged rear fork fixing screws; the other ends of the fixing plates on both sides of the rotating fixed body are fixed to one end of the rotating hole of the rotating fixed body through a pair of locking screws and connected as one body, and the two fixing plates on the outside of the other end of the rotating fixed body are connected as one body through another pair of locking screws. Thus, the opening and closing of the positioning piece can be adjusted by the adjusting device button extending from the lower end of the adjusting device body passing through the guide groove, that is, the adjusting positioning piece is inserted into or removed from the positioning grooves of the two fixing plates, and the above-mentioned adjusting device button and the adjusting device body can also be integrally formed. That is, the above-mentioned mechanism is not limited to a single front wheel and rear double wheels, but can also be arranged on a children's vehicle with front double wheels and rear single wheel, or on a children's vehicle with front and rear single wheels folded behind the front wheel and below the main beam tube.

[0005] The locking tube grooves of the two fixing plates connected to the locking screws are located at the lower side of the main beam tube, so that when the rear fork bent tube is opened by the adjustment device for use, the upper ends of the locking tube grooves of the two fixing plates on one side abut against the lower side of the main beam tube, further improving its stability during use.

[0006] The positioning member includes two fixing pins, and an adjusting device cover is provided at the upper end of the fixing pin. One end of the fixing pin is respectively inserted into the positioning grooves of the fixing plates on both sides of the rotating fixed body, and a positioning hole is provided at the other end. Two positioning columns are provided at the lower end of the adjusting device cover, and the positioning columns pass through the positioning holes of the fixing pins and are inserted into the control unit. The end of the adjusting device cover away from the positioning columns is fixedly connected to the control unit through the adjusting device fixing screws. Torsion springs are respectively sleeved on the positioning columns of the adjusting device cover, and one end of the torsion spring is connected to the fixing pin and the other end is connected to the adjusting device cover. The positioning grooves of the fixing plates on both sides of the rotating fixed body at least omit the two positioning grooves for opening and closing the rear fork bend.

[0007] The positioning member is a positioning bolt, a thread matched with the positioning bolt is arranged in the positioning groove, the positioning groove passes through the fixing plate, and the positioning bolt passes through the positioning groove.

[0008] The positioning member is a latch, and a handle is provided at one end of the latch located on the outside of the fixing plate; the positioning slot passes through the fixing plate, a fixing buckle is provided on the outside of the fixing plate, and an elastic buckle is provided at the connection between the fixing buckle and the fixing plate; the latch passes through the positioning slot, and the handle is adapted to the fixing buckle.

[0009] Buttons are respectively arranged on the outer side of the fixed plate, and the buttons include a button head and a telescopic structure. The button head and the telescopic structure are fixedly connected, and the telescopic structure passes through the positioning groove and is fixedly connected to the positioning groove; the positioning groove passes through the fixed plate, and a transfer groove is arranged on the side wall of the fixed plate close to the adjusting device, and the transfer groove is connected to the positioning groove; when the telescopic structure is in an extruded state, the button head is located on the inner side of the fixed plate and slides on the transfer groove, and when the telescopic structure is in an extended state, the button head is located on the outer side of the fixed plate.

[0010] One end of the rotating fixed body connected to the fixing plates on both sides is integrally provided with a toothed structure meshing with each other on the locking screw and the rotating hole.

[0011] The seat cushion is arranged on the main beam tube by rotating and fixing the main body, and the main beam tube is a chamfered rectangular tube.

[0012] The outer sides of the U-shaped openings at the other ends of the rear fork bent pipes are respectively provided with rear wheels fixed to the rear fork bent pipes through wheel sleeves.

[0013] A telescopic push rod is provided on one end of the rear wheel side of the main beam tube and is arranged on the main beam tube through a connecting piece.

[0014] The central axis holes on both sides of the front wheel at the front fork of the main beam tube are respectively provided with pedal assemblies, and the crankshaft end of the pedal assembly is inserted into the hexagonal hole on the central axis of the front wheel at the front fork and connected.

[0015] When the rear fork bent pipe is rotated downward to the side of the front fork through the adjusting device, the pedal assembly is removed, and the U-shaped opening of the rear fork bent pipe and the rear wheels on both sides are located outside the front wheel at the front fork, thereby facilitating further removal, packaging and transportation of the pedal assembly, and further reducing the overall space after folding.

[0016] According to the above structural features, the baby carriage provided with the adjusting device is convenient for folding, transportation and packaging.

[0017] The utility model has reasonable structural design, convenient operation, good stability and safety, convenient transportation and packaging, and small space occupation; the utility model is suitable for use as a rear fork folding mechanism for children's bicycles and similar products, and is a structural improvement for similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial exploded structural schematic diagram of an embodiment of the utility model, in which part A is framed and the fixing plate on the other side is in an installed state.

[0019] Figure 2 yes Figure 1 Enlarged view of part A.

[0020] Figure 3 yes Figure 1 Schematic diagram of the main structure after assembly, in which the arrow indicates the folding direction of the rear fork bend.

[0021] Figure 4 yes Figure 3 Schematic diagram of the structure of the rear fork bend after folding.

[0022] Serial number and name of the accompanying drawings: 1. Fixed plate, 101. Lock tube groove, 2. Locking screw, 3. Adjustment device button fixing screw, 4. Adjustment device body, 5. Return spring, 6. Adjustment device button, 7. Torsion spring, 8. Fixing pin, 9. Adjustment device cover plate, 10. Rotational fixed body, 1001, Guide groove, 11. Adjustment device fixing screw, 12. Rear fork fixing screw, 13. Rear fork bent pipe, 14. Decorative cover, 15. Decorative part, 16. Foot pedal assembly, 17. Main beam tube, 18. Cushion, 19. Telescopic push rod, 20. Wheel sleeve, 21. Rear wheel. Implementation

[0023] Now, in conjunction with the accompanying drawings, the structure and use of the utility model are further described. Figure 1-Figure 4The embodiment shown is a children's stroller with a single front wheel and double rear wheels. The adjustment device of the mechanism includes a control unit, which includes an adjustment device body 4, a return spring 5, an adjustment device button 6 and a positioning piece. A guide groove 1001 is provided in the cavity of the adjustment device, one end of the return spring abuts against the inner wall of the guide groove and the other end abuts against the adjustment device body; the adjustment device body is arranged on the guide groove, the upper end of the adjustment device body is connected to the positioning piece and the lower end is connected as an integral adjustment device button and passes through the guide groove, and the adjustment device body slides on the guide groove. The main body of the adjustment device is a rotating fixed body 10, which is arranged at the lower side of the main beam tube 17 on one side of the rear wheel assembly. The main beam tube is provided with a seat cushion 18. The two sides of the rotating fixed body are symmetrically provided with fixed plates 1. One end of the U-shaped section of the rear fork bent tube 13 is respectively fixed to the locking tube groove 101 at one end of the two fixing plates through symmetrically arranged rear fork fixing screws 12; the other ends of the fixing plates on both sides of the rotating fixed body are fixed to one end of the rotating hole of the rotating fixed body through a pair of locking screws 2 and connected as one body, and the two fixing plates on the outside of the other end of the rotating fixed body are connected as one body through another locking screw. The locking tube grooves of the two fixing plates connected by the locking screws are located at the lower side of the main beam tube.

[0024] The positioning member includes two fixing pins 8, and an adjusting device cover plate 9 is provided at the upper end of the fixing pin. One end of the fixing pin is respectively inserted into the positioning groove of the fixing plates on both sides of the rotating fixed body, and the other end is provided with a positioning hole. The lower end of the adjusting device cover plate is provided with two positioning columns, and the positioning columns penetrate the positioning holes of the fixing pins and are inserted into the control unit. The end of the adjusting device cover plate away from the positioning columns is fixedly connected to the control unit through the adjusting device fixing screws 11. Torsion springs 7 are respectively sleeved on the positioning columns of the adjusting device cover plate, and one end of the torsion spring is connected to the fixing pin and the other end is connected to the adjusting device cover plate. Decorative covers 14 are respectively provided at the outer cover openings of the fixing plates, and decorative parts 15 are respectively provided at the cover openings on both sides of the rotating fixed body.

[0025] The locking screw and the rotating hole are provided with a toothed structure meshing with each other at one end of the rotating fixed body connected to the fixing plates on both sides. The seat cushion is arranged on the main beam tube through the rotating fixed body, and the main beam tube is a chamfered rectangular tube. The outer side of the U-shaped opening at the other end of the rear fork bent tube is provided with a rear wheel 21 fixed to the rear fork bent tube through a wheel sleeve 20. A telescopic push rod 19 is provided on one end of the rear wheel of the main beam tube through a connecting piece. The central axis holes on both sides of the front wheel at the front fork of the main beam tube are provided with foot pedal assemblies 16, and the crankshaft end of the pedal assembly is inserted into the hexagonal hole on the central axis of the front wheel at the front fork and connected. When the rear fork bent tube is rotated downward to one side of the front fork through the adjusting device, the pedal assembly is removed, and the U-shaped opening of the rear fork bent tube and the rear wheels on both sides are located on the outer side of the front wheel at the front fork.

[0026] In summary, the rear fork folding mechanism and the rear fork bend 13 of the baby stroller are connected to the fixing plate 1 through the rear fork bend fixing screw 12; after the torsion spring 7 is installed into the adjusting device body 4, the fixing pin 8 is then installed and locked with the adjusting device fixing screw 11 to form the adjusting device, and the reset spring 5 and the adjusting device are installed together into the rotating fixed body 10, and the fixing plate 1 is connected to the rotating fixed body 10 through the locking screw 2, and the adjusting device button 6 is fixed to the adjusting device with the adjusting device button fixing screw 3, and the entire adjusting device can be installed. By sliding the adjusting device button 6 left and right, the fixing plate 1 rotates with the rotating fixed body 10 and one of the pairs of locking screws 2 that are connected to the fixing plates 1 on both sides as the center point, and rotates with the rear fork assembly, thereby realizing the folding of the rear fork. During the above process, the sliding adjustment device button 6 drives the fixing pins 8 on both sides of the adjustment device to be retracted toward the opening side of the adjustment device body 4 and then disengaged from the positioning grooves of the fixing plates 1 on both sides, thereby realizing the rotation of the rear fork assembly; after the rear fork assembly is rotated into place, the adjustment device button 6 is released, the adjustment device button 6 is reset by the reset spring 5, the fixing pins 8 on both sides are reset by the torsion spring 7, and the fixing pins 8 on both sides are reinserted into the positioning grooves of the fixing plates 1 on both sides, or another positioning groove of the fixing plates 1, and the rear fork assembly can be maintained in a folded and retracted or folded open state.

Claims

1. A rear fork folding mechanism, the adjusting device of the mechanism comprises a control unit, the control unit comprises an adjusting device body (4), a return spring (5), an adjusting device button (6) and a positioning member, a guide groove (1001) is provided in the cavity of the adjusting device, one end of the return spring abuts against the inner wall of the guide groove and the other end abuts against the adjusting device body; the adjusting device body is arranged on the guide groove, the upper end of the adjusting device body is connected to the positioning member and the lower end of the adjusting device button is connected to the positioning member as a whole and passes through the guide groove, and the adjusting device body slides on the guide groove; it is characterized in that The main body of the adjustment device is a rotating fixed body (10), which is arranged at the lower side of a main beam tube (17) on one side of the rear wheel assembly, and the main beam tube is provided with a seat cushion (18). Fixed plates (1) are symmetrically arranged on both sides of the rotating fixed body, and one end of the U-shaped section of the rear fork bent tube (13) or one end of the rear fork tube is respectively fixed to the locking tube groove (101) at one end of the fixing plates on both sides through symmetrically arranged rear fork fixing screws (12); the other ends of the fixing plates on both sides of the rotating fixed body are fixed to one end of the rotating hole of the rotating fixed body through a pair of locking screws (2) and are connected as a whole, and the two fixing plates on the outer side of the other end of the rotating fixed body are connected as a whole through another pair of locking screws.

2. The rear fork folding mechanism according to claim 1, characterized in that The tube locking grooves (101) at the two side fixing plates (1) connected to the locking screws (2) are located at the lower side of the main beam tube (17).

3. The rear fork folding mechanism according to claim 1, characterized in that The positioning member comprises two fixing pins (8), the upper ends of the fixing pins are provided with adjustment device covers (9), one ends of the fixing pins are respectively inserted into the positioning grooves of the fixing plates (1) on both sides of the rotating fixed body (10), and the other ends are provided with positioning holes, the lower end of the adjustment device cover is provided with two positioning columns, the positioning columns pass through the positioning holes of the fixing pins and are inserted into the control unit, the end of the adjustment device cover away from the positioning columns is fixedly connected to the control unit via adjustment device fixing screws (11), and torsion springs (7) are respectively sleeved on the positioning columns of the adjustment device cover, one end of the torsion spring is connected to the fixing pin and the other end is connected to the adjustment device cover.

4. The rear fork folding mechanism according to claim 3, characterized in that The positioning member is a positioning bolt, a thread matching the positioning bolt is provided in the positioning groove, the positioning groove passes through the fixing plate (1), and the positioning bolt passes through the positioning groove.

5. The rear fork folding mechanism according to claim 3, characterized in that The positioning member is a latch, and a handle is provided at one end of the latch located outside the fixing plate (1); the positioning slot passes through the fixing plate, a fixing buckle is provided on the outside of the fixing plate, and an elastic buckle is provided at the connection between the fixing buckle and the fixing plate; the latch passes through the positioning slot, and the handle is adapted to fit the fixing buckle.

6. The rear fork folding mechanism according to claim 3, characterized in that The fixed plate (1) is provided with buttons on the outside, the buttons comprising a button head and a telescopic structure, the button head and the telescopic structure are fixedly connected, the telescopic structure passes through the positioning groove and is fixedly connected to the positioning groove; the positioning groove passes through the fixed plate, and a transfer groove is provided on the side wall of the fixed plate close to the adjustment device, the transfer groove is connected to the positioning groove; when the telescopic structure is in an extruded state, the button head is located on the inside of the fixed plate and slides on the transfer groove, and when the telescopic structure is in an extended state, the button head is located on the outside of the fixed plate.

7. The rear fork folding mechanism according to claim 1, characterized in that One end of the rotating fixed body (10) integrally connected to the fixing plates (1) on both sides is provided with a toothed structure that meshes with each other on the locking screw (2) and the rotating hole.

8. The rear fork folding mechanism according to claim 1, characterized in that The seat cushion (18) is arranged on the main beam tube (17) by rotating and fixing the main body (10), and the main beam tube is a chamfered rectangular tube.

9. The rear fork folding mechanism according to claim 1, characterized in that When the rear fork bent pipe (13) is rotated downward to one side of the front fork through the adjusting device, the foot pedal assembly (16) is removed, and the U-shaped opening of the rear fork bent pipe and the rear wheels (21) on both sides are located outside the front wheel at the front fork.

10. A baby carriage, characterized in that: The baby stroller comprises the adjusting device according to any one of claims 1-9.

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