Patent ID: 8627738

Claim:
A device comprising: a linkage arrangement that is movable between a retracted orientation and an extended orientation, the linkage arrangement including a first linkage unit and a second linkage unit, each of the linkage units including a first link pivotally connected to a second link by a linkage joint, the linkage arrangement also including an interconnect member that interconnects the first linkage unit to the second linkage unit, the interconnect member being pivotally connected to the first link of the first linkage unit and also being pivotally connected to the first link of the second linkage unit; the first and the second links of at least one of the first and the second linkage units being movable about its respective one of the linkage joints between folded and unfolded orientations, the first and the second links of the at least one of the first and the second linkage units being positioned in the unfolded orientation when the linkage arrangement is in the extended orientation and also being positioned in the unfolded orientation when the linkage arrangement is in the retracted orientation, and the first and the second links of the at least one of the first and the second linkage units moving from the unfolded orientation to the folded orientation and then from the folded orientation back to the unfolded orientation as the linkage arrangement is moved from the retracted orientation to the extended orientation.