| 摘要 |
Disclosed is apparatus for raising and lowering a platform having wooden leg support means. A box girder is adapted to move axially about a wooden support leg of a platform, the box girder having means for securement of the girder to material forming the frame of a platform. The box girder has apertured lug on an exterior surface thereof. A header device is provided for detachable assembly with the top of a support leg of the platform during raising or lowering of the platform frame and screw means operationally cooperate with the header device and the girder lug for selectively raising or lowering the frame about the leg. Also disclosed is a method of using the apparatus in raising and lowering platform systems and has particular utility in dock systems.
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