| 摘要 |
An improved self-propelled wagon of the type having a body including front and rear ends, a front axle pivotally mounted to the front end, a rear axle mounted to the rear end, and a propelling means for transmitting the human force of the user to the rear axle. The improvement comprises a sliding gear assembly that includes a hollow tube having proximal and distal ends, a small spur sprocket freely rotably mounted at the proximal end of the hollow tube and a large spur sprocket means freely rotably mounted at said distal end of the hollow tube. The rotation of the sprockets driving corresponding chains trained thereon and causing the rotation of the rear axle. The sliding gear assembly is adapted such that a user may adjust the sliding gear assembly to selectively intermesh with, and turn, the small spur sprocket or the large spur sprocket. The improvement also comprises a steering assembly having a tube, horizontal rod, vertical rod, a fork and rod. The vertical rod having handle bars mounted on the upper end and rotating it, the tube journaling the vertical rod. The vertical rod in turn rotating the horizontal rod. The horizontal rod being held in longitudinal alignment with the fork until turned by the rotation of the handle bars. The reciprocating rowing motion of the propelling means does not alter the longitudinal alignment of the horizontal rod with the fork. In addition, the horizontal rod is connected to the front axle by a rod, the rod causing the front axle to pivotally turn when the handle bars are turned by the user. |
