CN111216833A

CN111216833A - Foldable bicycle for students and using method thereof

Info

Publication number: CN111216833A
Application number: CN202010117246.2A
Authority: CN
Inventors: 吴睿阳; 吴雷
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2020-06-02

Abstract

The invention discloses a foldable bicycle for students, which comprises a rear bracket, a luggage carrier, a rear wheel, a rear shaft, a support frame, a crank, a pedal plate, a middle shaft, a middle chain wheel, a chain, a saddle, a seat rod clamp, a front bracket, a connecting rod, a fixed rod, a front fork, a front mudguard, a rear mudguard, a front brake frame, a front brake cable, a rear brake frame, a rear brake cable, a front wheel, a front shaft and a cross rod, wherein the rear bracket is arranged on the rear bracket; a rear wheel is arranged below the rear mudguard, a rear shaft is arranged on the rear wheel, a support frame is arranged on one side of the rear wheel, the rear wheel is movably connected with the rear support through the rear shaft, a rear brake frame is arranged on the rear wheel, a rear brake cable is arranged on the rear brake frame, and a gear set is arranged on the other side of the rear wheel; the problem that folding steps of folding bicycle are loaded down with trivial details and the not good problem of effect of riding can be solved.

Description

Foldable bicycle for students and using method thereof

Technical Field

The invention relates to the field of folding bicycle devices, in particular to a foldable bicycle for students and a using method thereof.

Background

A bicycle, also called a bicycle or a bicycle, is a two-wheeled small land vehicle, and is a green and environment-friendly vehicle with pedals as power after people ride the bicycle; the bicycle is widely used in various fields and industries at present for the bicycle becomes the main vehicle that students learned, and the loaded down with trivial details condition of folding step and the not good condition of effect of riding when the student uses of current folding bicycle ubiquitous.

Publication No.: CN204642015U, which discloses a foldable bicycle, which is not suitable for solving the problems mentioned above, i.e. a bicycle or a bicycle, which is a two-wheeled small land vehicle, and is a green and environment-friendly vehicle powered by pedaling after people ride on the vehicle; the bicycle is widely used in various fields and industries at present for the bicycle becomes the main vehicle that students learned, and the loaded down with trivial details condition of folding step and the not good condition of effect of riding when the student uses of current folding bicycle ubiquitous.

Disclosure of Invention

The invention aims to provide a foldable bicycle for students and a using method thereof, which can solve the problems of complicated folding steps and poor riding effect of the foldable bicycle.

The purpose of the invention can be realized by the following technical scheme:

a foldable bicycle for students comprises a rear bracket, a luggage carrier, a rear wheel, a rear shaft, a support frame, a crank, a pedal plate, a middle shaft, a middle chain wheel, a chain, a saddle, a seat rod clamp, a front bracket, a connecting rod, a fixed rod, a front fork, a front mudguard, a rear mudguard, a front brake frame, a front brake cable, a rear brake frame, a rear brake cable, a front wheel, a front shaft and a cross rod; the rear wheel brake device is characterized in that a carrier is installed on one side of the rear support, a rear mudguard is installed below the carrier, a rear wheel is installed below the rear mudguard, a rear shaft is installed on the rear wheel, a support frame is installed on one side of the rear wheel, the rear wheel is movably connected with the rear support through the rear shaft, a rear brake frame is installed on the rear wheel, a rear brake cable is installed on the rear brake frame, a gear set is installed on the other side of the rear wheel, the gear set comprises a lower gear, a connecting frame, an upper gear, a first gear, a second gear, a third gear, a fourth gear and a fifth gear, the gear set is installed on one side of the rear support through the rear shaft, the fifth gear, the fourth gear, the third gear, the second gear and the first gear are sequentially installed on the rear shaft, the connecting frame is installed on one side of the first gear, and the upper gear is installed on the connecting frame, a lower gear is arranged on one side of the upper gear;

the seat post is mounted on the rear support through a seat post clamp, a saddle is mounted on the surface of the top of the seat post, a center shaft is mounted below the rear support, cranks are mounted at the left end and the right end of the center shaft, pedals are vertically mounted on the two cranks, a middle chain wheel is mounted at one end of the center shaft, a chain is mounted on the middle chain wheel, a third connecting plate is mounted on the surface of the other side of the rear support, a front support is mounted on one side of the third connecting plate, a fourth connecting plate is mounted on the surface of one side of the front support, one end of the third connecting plate is connected with one end of the fourth connecting plate through a rotating shaft, a middle fixing clamp is mounted between the other end of the third connecting plate and the other end of the fourth connecting plate, a rotating shaft is mounted on the other side of the front support, a front fork is mounted below the rotating shaft, the front brake device is characterized in that a front wheel is mounted on the front shaft, a front mudguard is mounted on the front wheel, a front brake frame is mounted on one side of the front fork, a front brake cable is mounted on the front brake frame, a second connecting plate is mounted on the surface of the top of the rotating shaft, a first connecting plate is mounted on the second connecting plate, one end of the second connecting plate is connected with one end of the first connecting plate through the rotating shaft, a front fixing clamp is mounted between the other end of the second connecting plate and the other end of the first connecting plate, a fixing rod is vertically mounted on the surface of the top of the first connecting plate, an annular frame is mounted on the surface of the outer portion of the fixing rod, a connecting rod is mounted inside the fixing rod, the connecting rod is mounted on the fixing rod through a connecting rod clamp, a cross rod is vertically welded on the surface of the top of the connecting rod, handles are, one the one side of handle is installed and is dialled, be connected with the regulation line on the finger dial, the second brake lever is installed to one side of finger dial, install preceding brake cable on the second brake lever, another first brake lever is installed to one side of handle, install back brake cable on the first brake lever.

Preferably, the middle chain wheel, the upper gear, the lower gear and the first gear are connected through a chain, and the middle chain wheel is movably connected with the bracket through a middle shaft.

Preferably, the front wheel is movably connected with the front mudguard through a front shaft, and the front wheel is movably connected with the front fork through a front shaft.

Preferably, the rear wheel is movably connected with the rear mudguard through a rear shaft, and the rest carriers of the rear wheel are movably connected through a rear shaft.

Preferably, the pedal plate is movably connected with the middle dental plate through a crank, and the crank is movably connected with the rear support through a middle shaft.

Preferably, the saddle is movably connected with the rear support through a sitting rod, and the sitting rod is slidably connected with the rear support.

Preferably, the use method of the foldable bicycle for the students comprises the following steps:

the method comprises the following steps: when riding, the support frame is folded, a person sits on the saddle, then the pedal is rotated by using two feet, the pedal is rotated to drive the crank to rotate, the crank is rotated to drive the middle shaft to rotate, the middle shaft is rotated to drive the middle toothed disc to rotate, the middle toothed disc drives the lower gear to rotate through the chain, the lower gear drives the upper gear to rotate through the chain, the upper gear drives the first gear to rotate through the chain, the first gear rotates to drive the rear wheel to rotate, and the rear wheel rotates to drive the front wheel to rotate; when the bicycle is steered, a person uses two hands to rotate the two handles in the same direction, the two handles rotate to drive the cross rod to rotate, the cross rod rotates to drive the connecting rod to rotate, the connecting rod rotates to drive the fixing rod to rotate, the fixing rod drives the front fork to rotate through the rotating shaft, and the front fork rotates to drive the front wheel to rotate left and right through the front shaft, so that the steering is completed; when the speed is changed, a person uses a finger to poke the finger, the finger is rotated, so that the length of a chain between the upper gear and the lower gear is changed through the adjusting line, and the chain moves on the first gear, the second gear, the third gear, the fourth gear and the fifth gear, so that the speed change is completed; when the bicycle is decelerated, the distance between the first brake lever and the handle and the distance between the second brake lever and the handle are reduced, the first brake lever adjusts the distance between the rear brake frame and the rear wheel through the rear brake cable, and the second brake lever adjusts the distance between the front brake frame and the front wheel through the front brake cable, so that the friction force between the rear brake frame and the rear wheel and the friction force between the front brake frame and the front wheel are increased, and the deceleration is finished;

step two: when the folding bicycle, sit the pole through adjusting and press from both sides, with the seat pole lapse through the saddle, until the seat pole is located the inside of after-poppet, adjust the connecting rod clamp after that, through pressing down the handle, thereby the handle lapse drives the horizontal pole lapse, thereby the horizontal pole lapse drives the connecting rod lapse, thereby the connecting rod lapse is driven to the horizontal pole lapse, until the connecting rod is located inside the dead lever, separate ring frame and preceding fixation clamp, thereby stir preceding fixation clamp and separate first connecting plate and second connecting plate, promote the horizontal pole after that until dead lever and front fork contact, thereby it separates third connecting plate and fourth connecting plate to dial in the fixation clamp after that, promote the fore-poppet after that until the fore-poppet is located one side of carrier after that.

Compared with the prior art, the invention has the beneficial effects that:

the invention is provided with a rear bracket, a carrier, a rear wheel, a rear shaft, a support frame, a crank, a pedal plate, a middle shaft, a middle toothed disc, a chain, a saddle, a seat rod clamp, a front bracket, a connecting rod, a fixed rod, a front fork, a front mudguard, a rear mudguard, a front brake frame, a front brake cable, a rear brake frame, a rear brake cable, a front wheel, a front shaft, a cross rod and the like, when riding, firstly, one foot is used for shifting the support frame so as to achieve the purpose of folding the support frame, a person sits on the surface of the top of the saddle, then two feet are put on the surface of the pedal plate, and the pedal plate is rotated by using the pedal plate to rotate, the crank is rotated so as to drive the middle shaft to rotate the middle toothed disc, the middle toothed disc drives a lower gear to rotate through the chain, the lower gear drives an upper gear to rotate through the chain, the upper gear drives the first gear to rotate through the chain, the first gear rotates to drive the rear wheel to rotate, and the rear wheel rotates to drive the front wheel to rotate; when a person rides the bicycle, when the person needs to turn, the person uses two hands to rotate the two handles in the same direction, the two handles rotate to drive the cross rod to rotate, the cross rod rotates to drive the connecting rod to rotate, the connecting rod rotates to drive the fixed rod to rotate, the fixed rod drives the front fork to rotate through the rotating shaft, and the front fork rotates to drive the front wheel to rotate left and right through the front shaft, so that the purpose of turning the bicycle is achieved; in the riding process, when the speed needs to be changed, a rider needs to use a finger to dial the finger, so that the finger can rotate, the length of a chain between the upper gear and the lower gear is changed through the adjustment line through the rotation of the finger, and the chain can move on the first gear, the second gear, the third gear, the fourth gear and the fifth gear, so that the purpose of changing the speed of the bicycle is fulfilled; when the bicycle is ridden and needs to be decelerated, a rider needs to reduce the distance between the first brake lever and the handle and the distance between the second brake lever and the handle, the first brake lever adjusts the distance between the rear brake frame and the rear wheel through the rear brake cable, the friction force between the rear brake frame and the rear wheel is increased, then the second brake lever adjusts the distance between the front brake frame and the front wheel through the front brake cable, and the friction force between the front brake frame and the front wheel is increased, so that the aim of deceleration is fulfilled; when a rider needs to fold the folding bicycle, the rider firstly needs to adjust the seat rod clamp and move the seat rod downwards through the saddle until the seat rod is positioned in the rear bracket, then adjusting the connecting rod clamp, pressing the handle downwards to drive the cross rod to move downwards, moving the cross rod downwards to drive the connecting rod to move downwards until the connecting rod is positioned in the fixed rod, separating the annular frame from the front fixing clamp, stirring the front fixing clamp to separate the first connecting plate from the second connecting plate, then the cross rod is pushed until the fixed rod is contacted with the front fork, then the middle fixing clamp is pulled so as to separate the third connecting plate and the fourth connecting plate, then the front bracket is pushed until the front bracket is positioned at one side of the luggage carrier, thereby completing the folding of the folding bicycle, the problem that folding steps of folding bicycle are loaded down with trivial details and the effect of riding is not good can be solved above.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of a main structure of a foldable bicycle for students;

FIG. 2 is a schematic view of a cross bar and handlebar structure of a foldable bicycle for students;

FIG. 3 is a schematic view of the crank and pedals of a foldable bicycle for students;

FIG. 4 is a schematic structural view of a middle crankset of a foldable bicycle for students;

FIG. 5 is a front view of a foldable bicycle for students;

FIG. 6 is an enlarged view of a portion of the structure at A in FIG. 2;

FIG. 7 is an enlarged view of a portion of the structure at B in FIG. 4;

FIG. 8 is an enlarged view of a portion of the structure at C in FIG. 4;

in the figure: 1. a rear bracket; 2. a carrier; 3. a rear wheel; 4. a rear axle; 5. a support frame; 6. a crank; 7. a foot pedal; 8. a middle shaft; 9. a middle chain wheel; 10. a chain; 11. a saddle; 12. a seat post; 13. a rod clip is arranged; 14. a front bracket; 15. a connecting rod; 16. fixing the rod; 17. a front fork; 18. a front fender; 181. a rear fender; 19. a front brake frame; 20. a front brake cable; 21. a rear brake frame; 22. a rear brake cable; 23. a front wheel; 24. a front axle; 25. a cross bar; 26. a first brake lever; 27. a second brake crank; 28. dialing; 29. a handle; 30. a connecting rod clamp; 31. an adjustment line; 32. an annular frame; 33. a front fixing clip; 34. a first connecting plate; 35. a second connecting plate; 36. a middle fixing clip; 37. a third connecting plate; 38. a fourth connecting plate; 39. a lower gear; 40. a connecting frame; 41. an upper gear; 42. a first gear; 43. a second gear; 44. a third gear; 45. a fourth gear; 46. and a fifth gear.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, a foldable bicycle for students comprises a rear bracket 1, a rack 2, a rear wheel 3, a rear axle 4, a support frame 5, a crank 6, a pedal 7, a middle axle 8, a middle chain wheel 9, a chain 10, a saddle 11, a seat rod 12, a seat rod clamp 13, a front bracket 14, a connecting rod 15, a fixing rod 16, a front fork 17, a front mud guard 18, a rear mud guard 181, a front brake frame 19, a front brake cable 20, a rear brake frame 21, a rear brake cable 22, a front wheel 23, a front axle 24 and a cross rod 25; a carrier frame 2 is arranged at one side of a rear bracket 1, a rear mudguard 181 is arranged below the carrier frame 2, a rear wheel 3 is arranged below the rear mudguard 181, a rear shaft 4 is arranged on the rear wheel 3, a support frame 5 is arranged at one side of the rear wheel 3, the rear wheel 3 is movably connected with the rear bracket 1 through the rear shaft 4, a rear brake frame 21 is arranged on the rear wheel 3, a rear brake cable 22 is arranged on the rear brake frame 21, a gear set is arranged at the other side of the rear wheel 3, the gear set comprises a lower gear 39, a connecting frame 40, an upper gear 41, a first gear 42, a second gear 43, a third gear 44, a fourth gear 45 and a fifth gear 46, the gear set is arranged at one side of the rear bracket 1 through the rear shaft 4, the fifth gear 46, the fourth gear 45, the third gear 44, the second gear 43 and the first gear 42 are sequentially arranged on the rear shaft 4, the connecting frame 40 is arranged on one side, the upper gear 41 is arranged on the connecting frame 40, a lower gear 39 is arranged on one side of the upper gear 41;

a seat rod 12 is arranged on the rear bracket 1 through a seat rod clamp 13, a saddle 11 is arranged on the surface of the top of the seat rod 12, a middle shaft 8 is arranged below the rear bracket 1, cranks 6 are arranged at the left end and the right end of the middle shaft 8, foot pedals 7 are vertically arranged on the two cranks 6, a middle chain wheel 9 is arranged at one end of the middle shaft 8, a chain 10 is arranged on the middle chain wheel 9, a third connecting plate 37 is arranged on the surface of the other side of the rear bracket 1, a front bracket 14 is arranged at one side of the third connecting plate 37, a fourth connecting plate 38 is arranged on the surface of one side of the front bracket 14, one end of the third connecting plate 37 is connected with one end of the fourth connecting plate 38 through a rotating shaft, a middle fixing clamp 36 is arranged between the other end of the third connecting plate 37 and the other end of the fourth connecting plate 38, a rotating shaft is arranged at the other side of the front, a front wheel 23 is arranged on a front shaft 24, a front mudguard 18 is arranged on the front wheel 23, a front brake frame 19 is arranged on one side of a front fork 17, a front brake cable 20 is arranged on the front brake frame 19, a second connecting plate 35 is arranged on the surface of the top of a rotating shaft, a first connecting plate 34 is arranged on the second connecting plate 35, one end of the second connecting plate 35 is connected with one end of the first connecting plate 34 through a rotating shaft, a front fixing clamp 33 is arranged between the other end of the second connecting plate 35 and the other end of the first connecting plate 34, a fixing rod 16 is vertically arranged on the surface of the top of the first connecting plate 34, an annular frame 32 is arranged on the surface of the outer part of the fixing rod 16, a connecting rod 15 is arranged inside the fixing rod 16, the connecting rod 15 is arranged on the fixing rod 16 through a connecting rod clamp 30, a cross rod 25 is vertically welded on the surface of the top of the, one side of one handle 29 is provided with a finger pad 28, the finger pad 28 is connected with an adjusting wire 31, one side of the finger pad 28 is provided with a second brake lever 27, the second brake lever 27 is provided with a front brake cable 20, one side of the other handle 29 is provided with a first brake lever 26, and the first brake lever 26 is provided with a rear brake cable 22.

The middle chain wheel 9, the upper gear 41, the lower gear 39 and the first gear 42 are connected through a chain 10, and the middle chain wheel 9 and the bracket 1 are movably connected through a middle shaft 8. The front wheel 23 is movably connected with the front mudguard 18 through a front shaft 24, and the front wheel 23 is movably connected with the front fork 17 through the front shaft 24. The rear wheel 3 is movably connected with the rear mudguard 181 through a rear shaft 4, and the rest carriers 2 of the rear wheel 3 are movably connected through the rear shaft 4. The pedal 7 is movably connected with the middle chain wheel 9 through a crank 6, and the crank 6 is movably connected with the rear support 1 through a middle shaft 8. The saddle 11 is movably connected with the rear support 1 through the sitting rod 12, and the sitting rod 12 is slidably connected with the rear support 1.

A use method of a foldable bicycle for students comprises the following steps:

the method comprises the following steps: when riding, the support frame 5 is folded, a person sits on the saddle 11, then the pedal 7 is rotated by using two feet, the pedal 7 rotates to drive the crank 6 to rotate, the crank 6 rotates to drive the middle shaft 8 to rotate, the middle shaft 8 rotates to drive the middle chain wheel 9 to rotate, the middle chain wheel 9 drives the lower gear 39 to rotate through the chain 10, the lower gear 39 rotates to drive the upper gear 41 to rotate through the chain 10, the upper gear 41 drives the first gear 42 to rotate through the chain 10, the first gear 42 rotates to drive the rear wheel 3 to rotate, and the rear wheel 3 rotates to drive the front wheel 23 to rotate; when the bicycle is steered, a person uses two hands to rotate the two handles 29 in the same direction, the two handles 29 rotate to drive the cross rod 25 to rotate, the cross rod 25 rotates to drive the connecting rod 15 to rotate, the connecting rod 15 rotates to drive the fixing rod 16 to rotate, the fixing rod 16 drives the front fork 17 to rotate through the rotating shaft, and the front fork 17 rotates to drive the front wheel 23 to rotate left and right through the front shaft 24, so that the steering is completed; when the speed is changed, a person uses a finger to dial the dial 28, the dial 28 rotates to change the length of the chain 10 between the upper gear 41 and the lower gear 39 through the adjusting line 31, so that the chain 10 moves on the five gears of the first gear 42, the second gear 43, the third gear 44, the fourth gear 45 and the fifth gear 46, and the speed change is completed; during deceleration, the distance between the first brake lever 26 and the handle 29 and the distance between the second brake lever 27 and the handle 29 are reduced, the first brake lever 26 adjusts the distance between the rear brake frame 21 and the rear wheel 3 through the rear brake cable 22, the second brake lever 27 adjusts the distance between the front brake frame 19 and the front wheel 23 through the front brake cable 20, so that the friction force between the rear brake frame 21 and the rear wheel 3 and the friction force between the front brake frame 19 and the front wheel 23 are increased, and deceleration is finished;

step two: when the bicycle is folded, the seat rod 12 is moved downwards through the saddle 11 by adjusting the seat rod clamp 13 until the seat rod 12 is positioned inside the rear bracket 1, then the connecting rod clamp 30 is adjusted, the handle 29 is moved downwards by pressing the handle 29 downwards so as to drive the cross rod 25 to move downwards, the cross rod 25 is moved downwards so as to drive the connecting rod 15 to move downwards until the connecting rod 15 is positioned inside the fixing rod 16, the annular frame 32 and the front fixing clamp 33 are separated, the front fixing clamp 33 is shifted so as to separate the first connecting plate 34 and the second connecting plate 35, then the cross rod 25 is pushed until the fixing rod 16 is contacted with the front fork 17, then the middle fixing clamp 36 is shifted so as to separate the third connecting plate 37 and the fourth connecting plate 38, and then the front bracket 14 is pushed until the front bracket 14 is positioned on one side of the carrier 2.

When the invention is used: when a person rides, firstly, the person uses one foot to stir the support frame 5 so as to achieve the purpose of folding the support frame 5, the person sits on the surface of the top of the saddle 11, then places two feet on the surface of the pedal 7, and uses the two feet to pedal the pedal 7 so as to rotate the pedal 7, the pedal 7 rotates so as to drive the crank 6 to rotate, the crank 6 rotates so as to drive the middle shaft 8 to rotate, the middle shaft 8 rotates so as to drive the middle toothed disc 9 to rotate, the middle toothed disc 9 drives the lower gear 39 to rotate through the chain 10, the lower gear 39 rotates so as to drive the upper gear 41 to rotate through the chain 10, the upper gear 41 drives the first gear 42 to rotate through the chain 10, the first gear 42 rotates so as to drive the rear wheel 3 to rotate, and the rear wheel 3 rotates so as to drive the front; when a person rides the bicycle, when the person needs to turn, the person uses two hands to rotate the two handles 29 in the same direction, the two handles 29 rotate to drive the cross rod 25 to rotate, the cross rod 25 rotates to drive the connecting rod 15 to rotate, the connecting rod 15 rotates to drive the fixed rod 16 to rotate, the fixed rod 16 drives the front fork 17 to rotate through the rotating shaft, and the front fork 17 rotates to drive the front wheel 23 to rotate left and right through the front shaft 24, so that the purpose of turning the bicycle is achieved; during riding, when speed change is needed, a rider needs to use a finger to dial the dial 28, so that the dial 28 rotates, the length of the chain 10 between the upper gear 41 and the lower gear 39 is changed through the adjusting line 31, and the chain 10 moves on five gears, namely a first gear 42, a second gear 43, a third gear 44, a fourth gear 45 and a fifth gear 46, so that the purpose of speed change of the bicycle is fulfilled; when the rider needs to decelerate during riding, the rider needs to reduce the distance between the first brake lever 26 and the handle 29 and the distance between the second brake lever 27 and the handle 29, the first brake lever 26 adjusts the distance between the rear brake frame 21 and the rear wheel 3 through the rear brake cable 22, the friction force between the rear brake frame 21 and the rear wheel 3 is increased, then the second brake lever 27 adjusts the distance between the front brake frame 19 and the front wheel 23 through the front brake cable 20, and the friction force between the front brake frame 19 and the front wheel 23 is increased, so that the purpose of decelerating is achieved; when a rider needs to fold the foldable bicycle, the rider first needs to adjust the seat bar clamp 13, the seat post 12 is moved downward by the saddle 11 until the seat post 12 is positioned inside the rear bracket 1, then the connecting rod clamp 30 is adjusted, by pressing the handle 29 downwards, the handle 29 moves downwards to drive the cross rod 25 to move downwards, the cross rod 25 moves downwards to drive the connecting rod 15 to move downwards until the connecting rod 15 is positioned inside the fixing rod 16, the annular frame 32 and the front fixing clamp 33 are separated, the front fixing clamp 33 is shifted to separate the first connecting plate 34 and the second connecting plate 35, the cross bar 25 is then pushed until the fixing lever 16 comes into contact with the front fork 17, followed by toggling the middle fixing clip 36 to separate the third connecting plate 37 from the fourth connecting plate 38, then, the front support 14 is pushed until the front support 14 is positioned at one side of the luggage carrier 2, so that the problems of complicated folding steps and poor riding effect of the folding bicycle can be solved.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A foldable bicycle for students is characterized by comprising a rear bracket (1), a carrier (2), a rear wheel (3), a rear shaft (4), a support frame (5), a crank (6), a pedal (7), a middle shaft (8), a middle toothed disc (9), a chain (10), a saddle (11), a seat rod (12), a seat rod clamp (13), a front bracket (14), a connecting rod (15), a fixing rod (16), a front fork (17), a front mudguard (18), a rear mudguard (181), a front brake frame (19), a front brake cable (20), a rear brake frame (21), a rear brake cable (22), a front wheel (23), a front shaft (24) and a cross rod (25); the rear wheel brake device is characterized in that a carrier (2) is installed on one side of a rear support (1), a rear mudguard (181) is installed below the carrier (2), a rear wheel (3) is installed below the rear mudguard (181), a rear shaft (4) is installed on the rear wheel (3), a support frame (5) is installed on one side of the rear wheel (3), the rear wheel (3) is movably connected with the rear support (1) through the rear shaft (4), a rear brake frame (21) is installed on the rear wheel (3), a rear brake cable (22) is installed on the rear brake frame (21), a gear set is installed on the other side of the rear wheel (3), the gear set comprises a lower gear (39), a connecting frame (40), an upper gear (41), a first gear (42), a second gear (43), a third gear (44), a fourth gear (45) and a fifth gear (46), and is installed on one side of the rear support (1) through the rear shaft (4), a fifth gear (46), a fourth gear (45), a third gear (44), a second gear (43) and a first gear (42) are sequentially mounted on the rear shaft (4), a connecting frame (40) is mounted on one side of the first gear (42), an upper gear (41) is mounted on the connecting frame (40), and a lower gear (39) is mounted on one side of the upper gear (41);

the seat post is characterized in that a seat post (12) is installed on the rear support (1) through a seat post clamp (13), a saddle (11) is installed on the surface of the top of the seat post (12), a middle shaft (8) is installed below the rear support (1), cranks (6) are installed at the left end and the right end of the middle shaft (8), pedals (7) are vertically installed on the two cranks (6), a middle chain plate (9) is installed at one end of the middle shaft (8), a chain (10) is installed on the middle chain plate (9), a third connecting plate (37) is installed on the surface of the other side of the rear support (1), a front support (14) is installed at one side of the third connecting plate (37), a fourth connecting plate (38) is installed on the surface of one side of the front support (14), and one end of the third connecting plate (37) is connected with one end of the fourth connecting plate (38) through a rotating shaft, fixing clamp (36) in installing between third connecting plate (37) other end and fourth connecting plate (38) other end, the rotation axis is installed to the opposite side of fore-stock (14), front fork (17) are installed to the below of rotation axis, front axle (24) are installed to the one end of front fork (17), install front wheel (23) on front axle (24), install preceding fender mud board (18) on front wheel (23), preceding brake frame (19) are installed to one side of front fork (17), install preceding brake cable (20) on preceding brake frame (19), the second connecting plate (35) is installed on the surface at rotation axis top, install first connecting plate (34) on second connecting plate (35), equally through the rotation axis connection between the one end of second connecting plate (35) and the one end of first connecting plate (34), fixed before installing between the other end of second connecting plate (35) and the other end of first connecting plate (34), fixed clamp (36) are installed between the other end of second connecting plate (35) and the other end of first connecting Clamp (33), dead lever (16) is installed perpendicularly on the surface at first connecting plate (34) top, install annular frame (32) on the outside surface of dead lever (16), dead lever (16) internally mounted has connecting rod (15), connecting rod (15) are through connecting rod clamp (30) installation dead lever (16) on, the vertical welding has horizontal pole (25) on the surface at connecting rod (15) top, all install handle (29) on the surface of the left and right sides both ends of horizontal pole (25), one dial (28) is installed to one side of handle (29), be connected with regulation line (31) on dial (28), second brake lever (27) is installed to one side of dial (28), install preceding brake cable (20) on second brake lever (27), another first brake lever (26) is installed to one side of handle (29), the first brake crank (26) is provided with a rear brake cable (22).

2. Foldable bicycle for students according to claim 1, characterized in that the middle crankset (9), the upper gear (41), the lower gear (39) and the first gear (42) are connected by a chain (10), the middle crankset (9) is movably connected with the bracket (1) by the middle shaft (8).

3. Foldable bicycle for students according to claim 1, characterized in that the front wheel (23) is movably connected with the front mudguard (18) through a front axle (24), and the front wheel (23) is movably connected with the front fork (17) through a front axle (24).

4. Foldable bicycle for students according to claim 1, characterized in that the rear wheel (3) is movably connected with the rear mudguard (181) through the rear axle (4), and the remaining carriers (2) of the rear wheel (3) are movably connected with the rear axle (4).

5. Foldable bicycle for students according to claim 1, characterized in that the pedals (7) are movably connected with the middle cranks (9) through cranks (6), and the cranks (6) are movably connected with the rear support (1) through the middle shaft (8).

6. Foldable bicycle for students according to claim 1, characterized in that the saddle (11) is movably connected with the rear support (1) through a sitting bar (12), the sitting bar (12) is slidably connected with the rear support (1).

7. A use method of a foldable bicycle for students is characterized by comprising the following steps:

the method comprises the following steps: when riding, the support frame (5) is folded, a person sits on the saddle (11), then the pedals (7) are rotated by using two feet, the pedals (7) rotate to drive the crank (6) to rotate, the crank (6) rotates to drive the middle shaft (8) to rotate, the middle shaft (8) rotates to drive the middle chain wheel (9) to rotate, the middle chain wheel (9) drives the lower gear (39) to rotate through the chain (10), the lower gear (39) rotates to drive the upper gear (41) to rotate through the chain (10), the upper gear (41) drives the first gear (42) to rotate through the chain (10), the first gear (42) rotates to drive the rear wheel (3) to rotate, and the rear wheel (3) rotates to drive the front wheel (23) to rotate; when the bicycle is turned, a person uses two hands to rotate two handles (29) in the same direction, the two handles (29) rotate to drive the cross rod (25) to rotate, the cross rod (25) rotates to drive the connecting rod (15) to rotate, the connecting rod (15) rotates to drive the fixing rod (16) to rotate, the fixing rod (16) drives the front fork (17) to rotate through the rotating shaft, and the front fork (17) rotates to drive the front wheel (23) to rotate left and right through the front shaft (24) to complete steering; when in speed change, a person uses fingers to poke the finger dial (28), the finger dial (28) rotates, so that the length of the chain (10) between the upper gear (41) and the lower gear (39) is changed through the adjusting line (31), and the chain (10) moves on the five gears, namely the first gear (42), the second gear (43), the third gear (44), the fourth gear (45) and the fifth gear (46), so that the speed change is completed; during deceleration, the distance between the first brake lever (26) and the handle (29) and the distance between the second brake lever (27) and the handle (29) are reduced, the first brake lever (26) adjusts the distance between the rear brake frame (21) and the rear wheel (3) through the rear brake cable (22), and the second brake lever (27) adjusts the distance between the front brake frame (19) and the front wheel (23) through the front brake cable (20), so that the friction force between the rear brake frame (21) and the rear wheel (3) and the friction force between the front brake frame (19) and the front wheel (23) are increased, and deceleration is finished;

step two: when the bicycle is folded, the seat rod (12) is moved downwards through the saddle (11) by adjusting the seat rod clamp (13) until the seat rod (12) is positioned inside the rear bracket (1), then adjusting the connecting rod clamp (30), pressing the handle (29) downwards, moving the handle (29) downwards to drive the cross rod (25) to move downwards, moving the cross rod (25) downwards to drive the connecting rod (15) to move downwards until the connecting rod (15) is positioned inside the fixing rod (16), separating the annular frame (32) from the front fixing clamp (33), shifting the front fixing clamp (33) to separate the first connecting plate (34) from the second connecting plate (35), then the cross bar (25) is pushed until the fixed rod (16) contacts with the front fork (17), then the fixed clamp (36) is stirred so as to separate the third connecting plate (37) and the fourth connecting plate (38), then the front support (14) is pushed until the front support (14) is positioned at one side of the luggage carrier (2).