| 摘要 |
<p>The bicycle has a frame 1 with pedals 17, a seat support 10 and a handlebar support 9, the latter being mounted for pivotal movement about a horizontal axis and there also being provided a mechanism 18, 19, 22 which is selectively connectible to the support 9 so as to impart a rocking or vibratory motion thereto. Said mechanism includes a polygonal plate 18 which is releasably engageable with a bearing 22 mounted on an extension 19 of the support 9, said polygonal plate 18 being rotatable via the pedals 17. For vibration or rocking to take place, the bearing 22 must contact the periphery of plate 18 but a pin 23 is provided between slots 24 in plates 15 to prevent this. The pin is urged towards the lower ends of the slots by a spring 25 but can be pulled up by means of a cable 27 operated from the handlebar. Instead of direct connection to the pin, the cable may be connected thereto via a lever (Fig. 6). Each foot of the supports 9, 10 may comprise telescopically coupled hollow housings having a compression spring therebetween (Figs. 8, 9). <IMAGE></p> |
