| 摘要 |
PCT No. PCT/NZ96/00065 Sec. 371 Date Apr. 21, 1998 Sec. 102(e) Date Apr. 21, 1998 PCT Filed Jun. 28, 1996 PCT Pub. No. WO97/02170 PCT Pub. Date Jan. 23, 1997A self-levelling platform arrangement comprises a platform which may form the base of a trolley container, supported on a biasing mechanism that comprises a scissors jack arrangement incorporating a tension spring to provide the biasing force whereby the platform descends as items are loaded onto the platform and rises as items are unloaded. The load/tension ratio of the spring is adjustable. To achieve tensioning of the spring, one end of the spring is attached to one of the opposite arms of the scissors arrangement through a flange plate while the outer end is attached to one end of a balance beam member supported for rotation about a fulcrum, the position of the fulcrum being variable along the length of the beam. The other end of the beam member connects, via a further flange plate, to the other of opposite arms by a connecting rod. |
