据美国特许会报第4466626号专利报导,一位叫捷斯 P。咪利斯的最近发明了一种“雪上和冰上用的自行车”。这种车架结构为菱形,在鞍管与立管交叉处安置一个与水平面垂直的撬板支撑立管。这种自行车无前叉和前轮,在前管上装有车把和转向杆,在转向杆端部装有车闸和雪撬装置,在撬板支撑立管的下端也装有同样的雪撬装置,中 According to the American Patent Bulletin No. 4466626 patent, one is Thies P. Milis recently invented a “snow and ice bike.” This frame structure is diamond-shaped, in the saddle pipe and riser cross place a horizontal plane perpendicular to the skid plate support riser. The bicycle has no front fork and front wheels, a handlebar and steering rod are mounted on the front pipe, a brake and a sled are provided at the end of the steering rod, and the same sled Device