| 摘要 |
<p>The mobile and collapsible basketball frame has a chassis mounted on wheels, and a parallelogram linkage with two hinge points on the chassis and two others on an arm supporting the board at its free end. An adjusting lever is provided for the linkage. The parallelogram levers (5,8) hinging on the chassis (1) have coupled to them one or more arms (16) with which a spring (20) engages, the other end of the spring (21,22) being secured to the chassis. The spring is stretched when the frame is folded. The arm can be joined to the front parallelogram lever near the lower hinge axis, extending downwards at an obtuse angle in relation to the lever, while the spring is a tension one.</p> |
