| 摘要 |
An apparatus having an upper frame adapted to at least partially encircle a person; a lower frame; a scissor mechanism for coupling the upper frame to the lower frame, wherein the distance between the upper frame and the lower frame can be varied by adjusting the scissor mechanism; and a telescoping rod coupled to the scissor mechanism for locking the scissor mechanism, wherein the distance between the upper frame and the lower frame is locked by the telescoping rod. |
