| 摘要 |
PURPOSE:To improve soil discharge performance, driving force and rigidity by inflating the expanded sections at both ends of center lug in opposite directions. CONSTITUTION:A center lug 11 has extended sections 11C at both ends to provide sufficient width thus to provide high rigidity and durability. While since the central portion 11D can be formed relatively thin, it will bite the ground face well and since both ends in back and fro of the centerl lug 11 are bent from the central portion 11D to the extended portion 11C, it will provide excellent traction force where the capterpillar will advance or back. While since the extended sections at both ends are inflated in opposite directions or one extended section 11C is inflated forwardly while the other extended section 11C is inflated rearwardly, excellent soil discharge performance is provided when advancing or backing. |
