practical folding bike

Abstract

The invention discloses a novel practical foldable bicycle which comprises a frame, a handlebar, a front wheel, a rear wheel, pedals, a saddle, a crankshaft, a middle axle and a chain transmission part. The frame comprises a crossbeam, a frame front tube, a middle tube and a rear tube. A front fork frame is disposed at the lower end of the frame front tube. A rear fork frame is disposed at the lower end of the frame rear tube. Two ends of the frame middle tube are respectively connected with the frame front tube and the frame rear tube through two rotation pairs. The front end of the crossbeam is connected with the frame front tube through a rotation pair. A moving pair is disposed between the frame middle tube and the crossbeam. The moving pair comprises a horizontal guide groove formed in the crossbeam and a fastening bolt disposed on the frame middle tube, wherein the fastening bolt penetrates the guide groove. A rotation pair is formed between the fastening bolt and the frame middle tube. The crossbeam further comprises a frame positioning block. The foldable bicycle is material saving, lightweight, high in strength, convenient to carry, safe, environmental friendly, convenient to fold and unfold, and regular in folded shape.

Description

technical field [0001] The invention relates to a bicycle, in particular to a folding bicycle. Background technique [0002] In recent years, due to the increasingly serious problems of global environmental pollution, resource shortage, and urban traffic congestion, bicycles are once again favored by people for their environmental protection, fitness, and convenience. But there are also a series of problems, such as insufficient parking space, sidewalk parking and bicycle theft. In the face of today's congested traffic conditions, environmental protection and convenience, there is an urgent need for a lightweight and portable means of transportation to serve people's daily lives, which brings great room for development of folding bicycles. [0003] Compared with ordinary bicycles, folding bicycles have many advantages: 1) Long service life and easy storage. Body aging and car loss are the most worrying problems for people. Once you have a folding bicycle, you can put it at...

AI Technical Summary

Problems solved by technology

Although the volume is reduced after being folded, the shape is irregular and must be carried for walking. It is not easy to carry, and it is troublesome to store and unfold. The shortcomings are obvious.

In addition, the strength of the frame and handlebars is not enough; the durability of use after repeated folding is obviously insufficient; the ground contact angle of the pedals of some folding bicycles does not meet the requirements (standard value >25°); the safety device is not perfect; some tires are small The body of some bikes is unstable; some handlebars are narrow and low, making the riding posture unnatural; some folding and assembly operations are more complicated; etc.

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