apparatus to raise and lower the king of heavy loads.

摘要

Apparatus for raising and lowering a heavy weight such as working platform along a column which also may raise and lower the column in the floating condition of the working platform in the same efficiency as the operation in the working platform. To this end, the apparatus is so constructed that main cylinder for raising and lowering the working platform and column is always actuated to push out the associated piston rod for moving the working platform or the column.