Bicycle

摘要

A four wheeled cycle including a frame, a load carrying base, two front wheels, two rear wheels, a steering mechanism, a brake mechanism, a pedal mechanism, a chain drive mechanism, and a saddle unit. The frame is a retractable frame, including a rear support frame, a down tube, a transverse tube, and at least two telescopic casing tube assemblies that are arranged side by side. Each of the telescopic casing tube assemblies includes a front casing tube, a middle rod, and a rear casing tube. The load carrying base includes a cross bar, a front connecting rod, a left connecting rod, a right connecting rod, a rear connecting rod and internally hinged bars for linking the connecting rods. The two front wheels are respectively connected to two ends of the cross bar through a bearing at the top ends of a front fork.

主权项

1. A four wheeled cycle, comprising:
a) a frame; b) a load carrying base; c) two front wheels; d) two rear wheels; e) a steering mechanism; f) a brake mechanism; g) a pedal mechanism; h) a chain drive mechanism; and i) a saddle unit;wherein
the two front wheels are connected to a bottom of the load carrying base through front forks; the frame is a retractable frame, comprising a rear support frame, a down tube, a transverse tube, and at least two telescopic casing tube assemblies that are arranged side by side; each of the telescopic casing tube assemblies comprises a front casing tube, a middle rod, and a rear casing tube; the front casing tube is fastened to the bottom of the load carrying base and sleeves a front end of the middle rod in a movable way; the rear casing tube is fastened to and sleeves a rear end of the middle rod; a portion of the middle rod before the rear casing tube is capable of retracting into the front casing tube; a tube mouth of the front casing tube is provided with a second fastening device which is used to fasten the middle rod so as to adjust the telescopic movement of the middle rod in the front casing tube; the steering mechanism comprises a handlebar comprising a main rod, a horizontal connecting rod, steering arms fixed on a lower end of the front forks, and a movable connecting rod that is fastened to a bottom end of the main rod of the handlebar; two ends of the horizontal connecting rod are in fixed connection to the steering arms, respectively; the main rod of the handlebar comprises an upper main rod and a lower main rod which are in a pivotal connection; and the upper main rod can be adjusted within an angle between an upward vertical direction and a horizontal direction by using a regulator.