| 摘要 |
An improved mud sill, for use with a generally horizontal baseplate of a base screw jack of a vertical scaffolding member, is taught that is easy to install and remove without tools and with a minimal amount of labor required. The improved mud sill attaches securely to the baseplate of a screw jack or scaffolding assembly without the use of extraneous fasteners, such as nails or screws. A multi-layered recess is provided in the improved mud sill to receive a baseplate axially and then the improved mud sill can be rotated relative to the baseplate to secure it in place. Once installed the improved mud sill of this important invention is restricted three dimensionally to the baseplate and yet it can easily be removed by a counter-rotation. No tools or fasteners are required.
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