| 摘要 |
According to the present invention there is provided a platform unit comprising: a reference platform and a utility platform, a set of extendable members, each configured between the reference platform and a set of tension elements, each configured between the reference platform and the utility platform. Each of the extendable members has a first end thereof attached to a member anchoring point of the reference platform and a second end attached to a member anchoring point of the utility platform. Each tension element has a first end thereof attached to an element anchoring point of the reference platform and a second end thereof attached to an element anchoring point of the utility platform. The arrangement is such that an extendable member and a tension element do not share the same two anchoring points. |
