| 摘要 |
PCT No. PCT/AU95/00741 Sec. 371 Date Jul. 24, 1997 Sec. 102(e) Date Jul. 24, 1997 PCT Filed Nov. 8, 1995 PCT Pub. No. WO96/14217 PCT Pub. Date May 17, 1996A mobile chassis (10) characterized by a central frame (12) which is supported by four wheels (60, 68, 74, 76). Wheels (74 and 76) are respectively support on one end of side beams (14 and 16) in turn pivotably mounted to central frame (12) at (70 and 72) to pivot about Y-Y axis. Wheels (66 and 68) are mounted on ends of a transverse beam (18) which is pivotably mounted at (52) to the central frame so that vertical movement of each wheel is compensated by pivoted movement of beams (14, 16 and 18). Rollers (56) and segments (42) constrain movement of the beam (18). |
