1. Check for protrusions: Yin Mingtao, engineer of the Yangzhou Quality Inspection Institute responsible for the test, said that the upper surface of the upper tube of the bicycle frame should not protrude from the child bicycle saddle to the front 300mm of the saddle. Objects, children accidentally fall when bumping or colliding with protrusions, can easily cause serious damage to bones and other soft tissues.
2. The maximum size of the brake handle should be suitable: The maximum grip size d of the brake handle should be less than or equal to 60mm between point A and point B. Because the child's hand is small, if the child's size is large, the child will ride it. Can not hold the handlebars, in the case of downhill and emergency situations can not be timely braking, braking, can easily cause personal injury.
3, saddle strength to meet the standard: In accordance with the standard requirements, saddle seat and saddle steel saddle beam should be able to withstand 400N tension without damage. The unsatisfactory strength of the saddle may cause the child to roll or even collapse during the riding process, causing the cyclist's center of gravity to shift out of control. When adults teach children to learn to ride a car, they tend to support the saddle. If the saddle strength is not qualified, it is very easy to cause a fall. For example, when the saddle face and the steel saddle beam bear 275N tension, as shown in the figure. It was broken off.
4, chain cover protection is necessary: ​​Yin Mingtao said that if the child bicycle saddle maximum height greater than 560mm, should be equipped with a chain cover or other protective device, when the chain placed on the sprocket, the disk chain cover should be Diametrically beyond the outer side of the chain. This requirement is to prevent children from hurting when they ride into the fit of the chain and sprockets.
5, the horizontal tube sleeve can not be less: In order to prevent the transverse tube sets of sharp corners, hard material damage to children, the sleeve should be made of elastic material and should have an enlarged tail end, including tube ends, and The figure of the child's bike has no enlarged end-fitting tube.
6, the balance wheel deformation requirements: the balance wheel is not used enough strength of the material, easy to cause children when riding a turn, the balance wheel bracket bending, can not play a balancing role, leading to children fall.
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