| 摘要 |
The present invention has a frame, two articulating structures, a drag link and a linear drive assembly. Each articulating structure has a rigid support, a serpentine support and a caster support. The rigid supports are pivotally connected to the frame and to the caster supports. The serpentine supports are pivotally connected to the frame, the rigid support and the caster support. The drag link makes the first and second articulating structures cooperate. The linear drive assembly is connected to the rigid support of one articulating structure and to the drag link. The linear drive assembly causes the bed to rise by acting in two directions, one to directly push the drag link in a first direction and the second to redirect the linear drive assembly force to indirectly push the drag link in the first direction by rotating the first rigid structure away from the frame.
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